Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
authorLinus Torvalds <torvalds@linux-foundation.org>
Sun, 26 Oct 2014 18:19:18 +0000 (11:19 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Sun, 26 Oct 2014 18:19:18 +0000 (11:19 -0700)
Pull vfs updates from Al Viro:
 "overlayfs merge + leak fix for d_splice_alias() failure exits"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  overlayfs: embed middle into overlay_readdir_data
  overlayfs: embed root into overlay_readdir_data
  overlayfs: make ovl_cache_entry->name an array instead of pointer
  overlayfs: don't hold ->i_mutex over opening the real directory
  fix inode leaks on d_splice_alias() failure exits
  fs: limit filesystem stacking depth
  overlay: overlay filesystem documentation
  overlayfs: implement show_options
  overlayfs: add statfs support
  overlay filesystem
  shmem: support RENAME_WHITEOUT
  ext4: support RENAME_WHITEOUT
  vfs: add RENAME_WHITEOUT
  vfs: add whiteout support
  vfs: export check_sticky()
  vfs: introduce clone_private_mount()
  vfs: export __inode_permission() to modules
  vfs: export do_splice_direct() to modules
  vfs: add i_op->dentry_open()

27 files changed:
Documentation/filesystems/Locking
Documentation/filesystems/overlayfs.txt [new file with mode: 0644]
Documentation/filesystems/vfs.txt
MAINTAINERS
fs/Kconfig
fs/Makefile
fs/btrfs/ioctl.c
fs/dcache.c
fs/ecryptfs/main.c
fs/ext4/namei.c
fs/internal.h
fs/namei.c
fs/namespace.c
fs/open.c
fs/overlayfs/Kconfig [new file with mode: 0644]
fs/overlayfs/Makefile [new file with mode: 0644]
fs/overlayfs/copy_up.c [new file with mode: 0644]
fs/overlayfs/dir.c [new file with mode: 0644]
fs/overlayfs/inode.c [new file with mode: 0644]
fs/overlayfs/overlayfs.h [new file with mode: 0644]
fs/overlayfs/readdir.c [new file with mode: 0644]
fs/overlayfs/super.c [new file with mode: 0644]
fs/splice.c
include/linux/fs.h
include/linux/mount.h
include/uapi/linux/fs.h
mm/shmem.c

index 94d93b1f8b530d44ab3855cdbbdc220fa8a8c60f..b30753cbf4311641ebd0ffe62735de05b452e77a 100644 (file)
@@ -67,6 +67,7 @@ prototypes:
                                struct file *, unsigned open_flag,
                                umode_t create_mode, int *opened);
        int (*tmpfile) (struct inode *, struct dentry *, umode_t);
+       int (*dentry_open)(struct dentry *, struct file *, const struct cred *);
 
 locking rules:
        all may block
@@ -96,6 +97,7 @@ fiemap:               no
 update_time:   no
 atomic_open:   yes
 tmpfile:       no
+dentry_open:   no
 
        Additionally, ->rmdir(), ->unlink() and ->rename() have ->i_mutex on
 victim.
diff --git a/Documentation/filesystems/overlayfs.txt b/Documentation/filesystems/overlayfs.txt
new file mode 100644 (file)
index 0000000..530850a
--- /dev/null
@@ -0,0 +1,198 @@
+Written by: Neil Brown <neilb@suse.de>
+
+Overlay Filesystem
+==================
+
+This document describes a prototype for a new approach to providing
+overlay-filesystem functionality in Linux (sometimes referred to as
+union-filesystems).  An overlay-filesystem tries to present a
+filesystem which is the result over overlaying one filesystem on top
+of the other.
+
+The result will inevitably fail to look exactly like a normal
+filesystem for various technical reasons.  The expectation is that
+many use cases will be able to ignore these differences.
+
+This approach is 'hybrid' because the objects that appear in the
+filesystem do not all appear to belong to that filesystem.  In many
+cases an object accessed in the union will be indistinguishable
+from accessing the corresponding object from the original filesystem.
+This is most obvious from the 'st_dev' field returned by stat(2).
+
+While directories will report an st_dev from the overlay-filesystem,
+all non-directory objects will report an st_dev from the lower or
+upper filesystem that is providing the object.  Similarly st_ino will
+only be unique when combined with st_dev, and both of these can change
+over the lifetime of a non-directory object.  Many applications and
+tools ignore these values and will not be affected.
+
+Upper and Lower
+---------------
+
+An overlay filesystem combines two filesystems - an 'upper' filesystem
+and a 'lower' filesystem.  When a name exists in both filesystems, the
+object in the 'upper' filesystem is visible while the object in the
+'lower' filesystem is either hidden or, in the case of directories,
+merged with the 'upper' object.
+
+It would be more correct to refer to an upper and lower 'directory
+tree' rather than 'filesystem' as it is quite possible for both
+directory trees to be in the same filesystem and there is no
+requirement that the root of a filesystem be given for either upper or
+lower.
+
+The lower filesystem can be any filesystem supported by Linux and does
+not need to be writable.  The lower filesystem can even be another
+overlayfs.  The upper filesystem will normally be writable and if it
+is it must support the creation of trusted.* extended attributes, and
+must provide valid d_type in readdir responses, so NFS is not suitable.
+
+A read-only overlay of two read-only filesystems may use any
+filesystem type.
+
+Directories
+-----------
+
+Overlaying mainly involves directories.  If a given name appears in both
+upper and lower filesystems and refers to a non-directory in either,
+then the lower object is hidden - the name refers only to the upper
+object.
+
+Where both upper and lower objects are directories, a merged directory
+is formed.
+
+At mount time, the two directories given as mount options "lowerdir" and
+"upperdir" are combined into a merged directory:
+
+  mount -t overlayfs overlayfs -olowerdir=/lower,upperdir=/upper,\
+workdir=/work /merged
+
+The "workdir" needs to be an empty directory on the same filesystem
+as upperdir.
+
+Then whenever a lookup is requested in such a merged directory, the
+lookup is performed in each actual directory and the combined result
+is cached in the dentry belonging to the overlay filesystem.  If both
+actual lookups find directories, both are stored and a merged
+directory is created, otherwise only one is stored: the upper if it
+exists, else the lower.
+
+Only the lists of names from directories are merged.  Other content
+such as metadata and extended attributes are reported for the upper
+directory only.  These attributes of the lower directory are hidden.
+
+whiteouts and opaque directories
+--------------------------------
+
+In order to support rm and rmdir without changing the lower
+filesystem, an overlay filesystem needs to record in the upper filesystem
+that files have been removed.  This is done using whiteouts and opaque
+directories (non-directories are always opaque).
+
+A whiteout is created as a character device with 0/0 device number.
+When a whiteout is found in the upper level of a merged directory, any
+matching name in the lower level is ignored, and the whiteout itself
+is also hidden.
+
+A directory is made opaque by setting the xattr "trusted.overlay.opaque"
+to "y".  Where the upper filesystem contains an opaque directory, any
+directory in the lower filesystem with the same name is ignored.
+
+readdir
+-------
+
+When a 'readdir' request is made on a merged directory, the upper and
+lower directories are each read and the name lists merged in the
+obvious way (upper is read first, then lower - entries that already
+exist are not re-added).  This merged name list is cached in the
+'struct file' and so remains as long as the file is kept open.  If the
+directory is opened and read by two processes at the same time, they
+will each have separate caches.  A seekdir to the start of the
+directory (offset 0) followed by a readdir will cause the cache to be
+discarded and rebuilt.
+
+This means that changes to the merged directory do not appear while a
+directory is being read.  This is unlikely to be noticed by many
+programs.
+
+seek offsets are assigned sequentially when the directories are read.
+Thus if
+  - read part of a directory
+  - remember an offset, and close the directory
+  - re-open the directory some time later
+  - seek to the remembered offset
+
+there may be little correlation between the old and new locations in
+the list of filenames, particularly if anything has changed in the
+directory.
+
+Readdir on directories that are not merged is simply handled by the
+underlying directory (upper or lower).
+
+
+Non-directories
+---------------
+
+Objects that are not directories (files, symlinks, device-special
+files etc.) are presented either from the upper or lower filesystem as
+appropriate.  When a file in the lower filesystem is accessed in a way
+the requires write-access, such as opening for write access, changing
+some metadata etc., the file is first copied from the lower filesystem
+to the upper filesystem (copy_up).  Note that creating a hard-link
+also requires copy_up, though of course creation of a symlink does
+not.
+
+The copy_up may turn out to be unnecessary, for example if the file is
+opened for read-write but the data is not modified.
+
+The copy_up process first makes sure that the containing directory
+exists in the upper filesystem - creating it and any parents as
+necessary.  It then creates the object with the same metadata (owner,
+mode, mtime, symlink-target etc.) and then if the object is a file, the
+data is copied from the lower to the upper filesystem.  Finally any
+extended attributes are copied up.
+
+Once the copy_up is complete, the overlay filesystem simply
+provides direct access to the newly created file in the upper
+filesystem - future operations on the file are barely noticed by the
+overlay filesystem (though an operation on the name of the file such as
+rename or unlink will of course be noticed and handled).
+
+
+Non-standard behavior
+---------------------
+
+The copy_up operation essentially creates a new, identical file and
+moves it over to the old name.  The new file may be on a different
+filesystem, so both st_dev and st_ino of the file may change.
+
+Any open files referring to this inode will access the old data and
+metadata.  Similarly any file locks obtained before copy_up will not
+apply to the copied up file.
+
+On a file opened with O_RDONLY fchmod(2), fchown(2), futimesat(2) and
+fsetxattr(2) will fail with EROFS.
+
+If a file with multiple hard links is copied up, then this will
+"break" the link.  Changes will not be propagated to other names
+referring to the same inode.
+
+Symlinks in /proc/PID/ and /proc/PID/fd which point to a non-directory
+object in overlayfs will not contain valid absolute paths, only
+relative paths leading up to the filesystem's root.  This will be
+fixed in the future.
+
+Some operations are not atomic, for example a crash during copy_up or
+rename will leave the filesystem in an inconsistent state.  This will
+be addressed in the future.
+
+Changes to underlying filesystems
+---------------------------------
+
+Offline changes, when the overlay is not mounted, are allowed to either
+the upper or the lower trees.
+
+Changes to the underlying filesystems while part of a mounted overlay
+filesystem are not allowed.  If the underlying filesystem is changed,
+the behavior of the overlay is undefined, though it will not result in
+a crash or deadlock.
index fceff7c00a3c8eb48517cf72d9e9eb1fb3ecc750..20bf204426cad3a7854866e302ce22952e58d1a5 100644 (file)
@@ -364,6 +364,7 @@ struct inode_operations {
        int (*atomic_open)(struct inode *, struct dentry *, struct file *,
                        unsigned open_flag, umode_t create_mode, int *opened);
        int (*tmpfile) (struct inode *, struct dentry *, umode_t);
+       int (*dentry_open)(struct dentry *, struct file *, const struct cred *);
 };
 
 Again, all methods are called without any locks being held, unless
@@ -696,6 +697,12 @@ struct address_space_operations {
        but instead uses bmap to find out where the blocks in the file
        are and uses those addresses directly.
 
+  dentry_open: *WARNING: probably going away soon, do not use!* This is an
+       alternative to f_op->open(), the difference is that this method may open
+       a file not necessarily originating from the same filesystem as the one
+       i_op->open() was called on.  It may be useful for stacking filesystems
+       which want to allow native I/O directly on underlying files.
+
 
   invalidatepage: If a page has PagePrivate set, then invalidatepage
         will be called when part or all of the page is to be removed
index 0484f2c526f0c80b5750981b2cf1f8f877d578f9..ec25b0e1e74557233169640c7a7f52dcdf3469ce 100644 (file)
@@ -6840,6 +6840,13 @@ F:       drivers/scsi/osd/
 F:     include/scsi/osd_*
 F:     fs/exofs/
 
+OVERLAYFS FILESYSTEM
+M:     Miklos Szeredi <miklos@szeredi.hu>
+L:     linux-fsdevel@vger.kernel.org
+S:     Supported
+F:     fs/overlayfs/*
+F:     Documentation/filesystems/overlayfs.txt
+
 P54 WIRELESS DRIVER
 M:     Christian Lamparter <chunkeey@googlemail.com>
 L:     linux-wireless@vger.kernel.org
index db5dc159871612caaa6bf6a068977d989328e218..664991afe0c05b616dd6f9c8909d9d517316086e 100644 (file)
@@ -67,6 +67,7 @@ source "fs/quota/Kconfig"
 
 source "fs/autofs4/Kconfig"
 source "fs/fuse/Kconfig"
+source "fs/overlayfs/Kconfig"
 
 menu "Caches"
 
index 90c88529892bfc9723a9aec9ed6540daeb372f76..34a1b9dea6dda9824eda07022cb544db83066eed 100644 (file)
@@ -104,6 +104,7 @@ obj-$(CONFIG_QNX6FS_FS)             += qnx6/
 obj-$(CONFIG_AUTOFS4_FS)       += autofs4/
 obj-$(CONFIG_ADFS_FS)          += adfs/
 obj-$(CONFIG_FUSE_FS)          += fuse/
+obj-$(CONFIG_OVERLAYFS_FS)     += overlayfs/
 obj-$(CONFIG_UDF_FS)           += udf/
 obj-$(CONFIG_SUN_OPENPROMFS)   += openpromfs/
 obj-$(CONFIG_OMFS_FS)          += omfs/
index 8d2b76e29d3b1ae46c04af4bd3ffa2e78926e460..4399f0c3a4ce1c6a08cfa81f2720f27a7138eea7 100644 (file)
@@ -765,23 +765,6 @@ out:
        return ret;
 }
 
-/*  copy of check_sticky in fs/namei.c()
-* It's inline, so penalty for filesystems that don't use sticky bit is
-* minimal.
-*/
-static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode)
-{
-       kuid_t fsuid = current_fsuid();
-
-       if (!(dir->i_mode & S_ISVTX))
-               return 0;
-       if (uid_eq(inode->i_uid, fsuid))
-               return 0;
-       if (uid_eq(dir->i_uid, fsuid))
-               return 0;
-       return !capable(CAP_FOWNER);
-}
-
 /*  copy of may_delete in fs/namei.c()
  *     Check whether we can remove a link victim from directory dir, check
  *  whether the type of victim is right.
@@ -817,8 +800,7 @@ static int btrfs_may_delete(struct inode *dir, struct dentry *victim, int isdir)
                return error;
        if (IS_APPEND(dir))
                return -EPERM;
-       if (btrfs_check_sticky(dir, victim->d_inode)||
-               IS_APPEND(victim->d_inode)||
+       if (check_sticky(dir, victim->d_inode) || IS_APPEND(victim->d_inode) ||
            IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode))
                return -EPERM;
        if (isdir) {
index d5a23fd0da903848682c659085a6c560e48d8a8c..3ffef7f4e5cdd9d00ca454130070f4619a8707d6 100644 (file)
@@ -2673,11 +2673,13 @@ struct dentry *d_splice_alias(struct inode *inode, struct dentry *dentry)
                        if (!IS_ROOT(new)) {
                                spin_unlock(&inode->i_lock);
                                dput(new);
+                               iput(inode);
                                return ERR_PTR(-EIO);
                        }
                        if (d_ancestor(new, dentry)) {
                                spin_unlock(&inode->i_lock);
                                dput(new);
+                               iput(inode);
                                return ERR_PTR(-EIO);
                        }
                        write_seqlock(&rename_lock);
index 1b119d3bf924d16eea7f91f52449b122ecb5dcb1..c4cd1fd86cc2ffd4a09beddd3aca3f25d1fdb06f 100644 (file)
@@ -566,6 +566,13 @@ static struct dentry *ecryptfs_mount(struct file_system_type *fs_type, int flags
        s->s_maxbytes = path.dentry->d_sb->s_maxbytes;
        s->s_blocksize = path.dentry->d_sb->s_blocksize;
        s->s_magic = ECRYPTFS_SUPER_MAGIC;
+       s->s_stack_depth = path.dentry->d_sb->s_stack_depth + 1;
+
+       rc = -EINVAL;
+       if (s->s_stack_depth > FILESYSTEM_MAX_STACK_DEPTH) {
+               pr_err("eCryptfs: maximum fs stacking depth exceeded\n");
+               goto out_free;
+       }
 
        inode = ecryptfs_get_inode(path.dentry->d_inode, s);
        rc = PTR_ERR(inode);
index adb559de23c1d83e65b8f79b6081526f496cb880..123798c5ac314c3ff7522c84de2907c6e7587800 100644 (file)
@@ -3148,6 +3148,39 @@ static void ext4_update_dir_count(handle_t *handle, struct ext4_renament *ent)
        }
 }
 
+static struct inode *ext4_whiteout_for_rename(struct ext4_renament *ent,
+                                             int credits, handle_t **h)
+{
+       struct inode *wh;
+       handle_t *handle;
+       int retries = 0;
+
+       /*
+        * for inode block, sb block, group summaries,
+        * and inode bitmap
+        */
+       credits += (EXT4_MAXQUOTAS_TRANS_BLOCKS(ent->dir->i_sb) +
+                   EXT4_XATTR_TRANS_BLOCKS + 4);
+retry:
+       wh = ext4_new_inode_start_handle(ent->dir, S_IFCHR | WHITEOUT_MODE,
+                                        &ent->dentry->d_name, 0, NULL,
+                                        EXT4_HT_DIR, credits);
+
+       handle = ext4_journal_current_handle();
+       if (IS_ERR(wh)) {
+               if (handle)
+                       ext4_journal_stop(handle);
+               if (PTR_ERR(wh) == -ENOSPC &&
+                   ext4_should_retry_alloc(ent->dir->i_sb, &retries))
+                       goto retry;
+       } else {
+               *h = handle;
+               init_special_inode(wh, wh->i_mode, WHITEOUT_DEV);
+               wh->i_op = &ext4_special_inode_operations;
+       }
+       return wh;
+}
+
 /*
  * Anybody can rename anything with this: the permission checks are left to the
  * higher-level routines.
@@ -3157,7 +3190,8 @@ static void ext4_update_dir_count(handle_t *handle, struct ext4_renament *ent)
  * This comes from rename(const char *oldpath, const char *newpath)
  */
 static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
-                      struct inode *new_dir, struct dentry *new_dentry)
+                      struct inode *new_dir, struct dentry *new_dentry,
+                      unsigned int flags)
 {
        handle_t *handle = NULL;
        struct ext4_renament old = {
@@ -3172,6 +3206,9 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
        };
        int force_reread;
        int retval;
+       struct inode *whiteout = NULL;
+       int credits;
+       u8 old_file_type;
 
        dquot_initialize(old.dir);
        dquot_initialize(new.dir);
@@ -3210,11 +3247,17 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
        if (new.inode && !test_opt(new.dir->i_sb, NO_AUTO_DA_ALLOC))
                ext4_alloc_da_blocks(old.inode);
 
-       handle = ext4_journal_start(old.dir, EXT4_HT_DIR,
-               (2 * EXT4_DATA_TRANS_BLOCKS(old.dir->i_sb) +
-                EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2));
-       if (IS_ERR(handle))
-               return PTR_ERR(handle);
+       credits = (2 * EXT4_DATA_TRANS_BLOCKS(old.dir->i_sb) +
+                  EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2);
+       if (!(flags & RENAME_WHITEOUT)) {
+               handle = ext4_journal_start(old.dir, EXT4_HT_DIR, credits);
+               if (IS_ERR(handle))
+                       return PTR_ERR(handle);
+       } else {
+               whiteout = ext4_whiteout_for_rename(&old, credits, &handle);
+               if (IS_ERR(whiteout))
+                       return PTR_ERR(whiteout);
+       }
 
        if (IS_DIRSYNC(old.dir) || IS_DIRSYNC(new.dir))
                ext4_handle_sync(handle);
@@ -3242,13 +3285,26 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
         */
        force_reread = (new.dir->i_ino == old.dir->i_ino &&
                        ext4_test_inode_flag(new.dir, EXT4_INODE_INLINE_DATA));
+
+       old_file_type = old.de->file_type;
+       if (whiteout) {
+               /*
+                * Do this before adding a new entry, so the old entry is sure
+                * to be still pointing to the valid old entry.
+                */
+               retval = ext4_setent(handle, &old, whiteout->i_ino,
+                                    EXT4_FT_CHRDEV);
+               if (retval)
+                       goto end_rename;
+               ext4_mark_inode_dirty(handle, whiteout);
+       }
        if (!new.bh) {
                retval = ext4_add_entry(handle, new.dentry, old.inode);
                if (retval)
                        goto end_rename;
        } else {
                retval = ext4_setent(handle, &new,
-                                    old.inode->i_ino, old.de->file_type);
+                                    old.inode->i_ino, old_file_type);
                if (retval)
                        goto end_rename;
        }
@@ -3263,10 +3319,12 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
        old.inode->i_ctime = ext4_current_time(old.inode);
        ext4_mark_inode_dirty(handle, old.inode);
 
-       /*
-        * ok, that's it
-        */
-       ext4_rename_delete(handle, &old, force_reread);
+       if (!whiteout) {
+               /*
+                * ok, that's it
+                */
+               ext4_rename_delete(handle, &old, force_reread);
+       }
 
        if (new.inode) {
                ext4_dec_count(handle, new.inode);
@@ -3302,6 +3360,12 @@ end_rename:
        brelse(old.dir_bh);
        brelse(old.bh);
        brelse(new.bh);
+       if (whiteout) {
+               if (retval)
+                       drop_nlink(whiteout);
+               unlock_new_inode(whiteout);
+               iput(whiteout);
+       }
        if (handle)
                ext4_journal_stop(handle);
        return retval;
@@ -3434,18 +3498,15 @@ static int ext4_rename2(struct inode *old_dir, struct dentry *old_dentry,
                        struct inode *new_dir, struct dentry *new_dentry,
                        unsigned int flags)
 {
-       if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE))
+       if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
                return -EINVAL;
 
        if (flags & RENAME_EXCHANGE) {
                return ext4_cross_rename(old_dir, old_dentry,
                                         new_dir, new_dentry);
        }
-       /*
-        * Existence checking was done by the VFS, otherwise "RENAME_NOREPLACE"
-        * is equivalent to regular rename.
-        */
-       return ext4_rename(old_dir, old_dentry, new_dir, new_dentry);
+
+       return ext4_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
 }
 
 /*
index 9477f8f6aefca491ec50be5c2fda03cf64997a65..757ba2abf21e6c205867960d5fa2ee3b2f77d46f 100644 (file)
@@ -47,7 +47,6 @@ extern void __init chrdev_init(void);
 /*
  * namei.c
  */
-extern int __inode_permission(struct inode *, int);
 extern int user_path_mountpoint_at(int, const char __user *, unsigned int, struct path *);
 extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
                           const char *, unsigned int, struct path *);
@@ -138,12 +137,6 @@ extern long prune_dcache_sb(struct super_block *sb, unsigned long nr_to_scan,
  */
 extern int rw_verify_area(int, struct file *, const loff_t *, size_t);
 
-/*
- * splice.c
- */
-extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
-               loff_t *opos, size_t len, unsigned int flags);
-
 /*
  * pipe.c
  */
index 43927d14db67c68706ef8dd208c714ec2ec6addb..42df664e95e54a2148093c14fe1f1ce43b909f33 100644 (file)
@@ -416,6 +416,7 @@ int __inode_permission(struct inode *inode, int mask)
 
        return security_inode_permission(inode, mask);
 }
+EXPORT_SYMBOL(__inode_permission);
 
 /**
  * sb_permission - Check superblock-level permissions
@@ -2383,22 +2384,17 @@ kern_path_mountpoint(int dfd, const char *name, struct path *path,
 }
 EXPORT_SYMBOL(kern_path_mountpoint);
 
-/*
- * It's inline, so penalty for filesystems that don't use sticky bit is
- * minimal.
- */
-static inline int check_sticky(struct inode *dir, struct inode *inode)
+int __check_sticky(struct inode *dir, struct inode *inode)
 {
        kuid_t fsuid = current_fsuid();
 
-       if (!(dir->i_mode & S_ISVTX))
-               return 0;
        if (uid_eq(inode->i_uid, fsuid))
                return 0;
        if (uid_eq(dir->i_uid, fsuid))
                return 0;
        return !capable_wrt_inode_uidgid(inode, CAP_FOWNER);
 }
+EXPORT_SYMBOL(__check_sticky);
 
 /*
  *     Check whether we can remove a link victim from directory dir, check
@@ -3064,9 +3060,12 @@ finish_open_created:
        error = may_open(&nd->path, acc_mode, open_flag);
        if (error)
                goto out;
-       file->f_path.mnt = nd->path.mnt;
-       error = finish_open(file, nd->path.dentry, NULL, opened);
-       if (error) {
+
+       BUG_ON(*opened & FILE_OPENED); /* once it's opened, it's opened */
+       error = vfs_open(&nd->path, file, current_cred());
+       if (!error) {
+               *opened |= FILE_OPENED;
+       } else {
                if (error == -EOPENSTALE)
                        goto stale_open;
                goto out;
@@ -4210,12 +4209,16 @@ SYSCALL_DEFINE5(renameat2, int, olddfd, const char __user *, oldname,
        bool should_retry = false;
        int error;
 
-       if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE))
+       if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
                return -EINVAL;
 
-       if ((flags & RENAME_NOREPLACE) && (flags & RENAME_EXCHANGE))
+       if ((flags & (RENAME_NOREPLACE | RENAME_WHITEOUT)) &&
+           (flags & RENAME_EXCHANGE))
                return -EINVAL;
 
+       if ((flags & RENAME_WHITEOUT) && !capable(CAP_MKNOD))
+               return -EPERM;
+
 retry:
        from = user_path_parent(olddfd, oldname, &oldnd, lookup_flags);
        if (IS_ERR(from)) {
@@ -4347,6 +4350,20 @@ SYSCALL_DEFINE2(rename, const char __user *, oldname, const char __user *, newna
        return sys_renameat2(AT_FDCWD, oldname, AT_FDCWD, newname, 0);
 }
 
+int vfs_whiteout(struct inode *dir, struct dentry *dentry)
+{
+       int error = may_create(dir, dentry);
+       if (error)
+               return error;
+
+       if (!dir->i_op->mknod)
+               return -EPERM;
+
+       return dir->i_op->mknod(dir, dentry,
+                               S_IFCHR | WHITEOUT_MODE, WHITEOUT_DEV);
+}
+EXPORT_SYMBOL(vfs_whiteout);
+
 int readlink_copy(char __user *buffer, int buflen, const char *link)
 {
        int len = PTR_ERR(link);
index fbba8b17330d40d4daff7cf61763853cfd414395..5b66b2b3624d0da0efe405a6ecb4c86e07a0b58f 100644 (file)
@@ -1686,6 +1686,33 @@ void drop_collected_mounts(struct vfsmount *mnt)
        namespace_unlock();
 }
 
+/**
+ * clone_private_mount - create a private clone of a path
+ *
+ * This creates a new vfsmount, which will be the clone of @path.  The new will
+ * not be attached anywhere in the namespace and will be private (i.e. changes
+ * to the originating mount won't be propagated into this).
+ *
+ * Release with mntput().
+ */
+struct vfsmount *clone_private_mount(struct path *path)
+{
+       struct mount *old_mnt = real_mount(path->mnt);
+       struct mount *new_mnt;
+
+       if (IS_MNT_UNBINDABLE(old_mnt))
+               return ERR_PTR(-EINVAL);
+
+       down_read(&namespace_sem);
+       new_mnt = clone_mnt(old_mnt, path->dentry, CL_PRIVATE);
+       up_read(&namespace_sem);
+       if (IS_ERR(new_mnt))
+               return ERR_CAST(new_mnt);
+
+       return &new_mnt->mnt;
+}
+EXPORT_SYMBOL_GPL(clone_private_mount);
+
 int iterate_mounts(int (*f)(struct vfsmount *, void *), void *arg,
                   struct vfsmount *root)
 {
index d6fd3acde134d9669391cd064960790dea586042..de92c13b58be29e757cd58b53d10232439ad57c5 100644 (file)
--- a/fs/open.c
+++ b/fs/open.c
@@ -823,8 +823,7 @@ struct file *dentry_open(const struct path *path, int flags,
        f = get_empty_filp();
        if (!IS_ERR(f)) {
                f->f_flags = flags;
-               f->f_path = *path;
-               error = do_dentry_open(f, NULL, cred);
+               error = vfs_open(path, f, cred);
                if (!error) {
                        /* from now on we need fput() to dispose of f */
                        error = open_check_o_direct(f);
@@ -841,6 +840,26 @@ struct file *dentry_open(const struct path *path, int flags,
 }
 EXPORT_SYMBOL(dentry_open);
 
+/**
+ * vfs_open - open the file at the given path
+ * @path: path to open
+ * @filp: newly allocated file with f_flag initialized
+ * @cred: credentials to use
+ */
+int vfs_open(const struct path *path, struct file *filp,
+            const struct cred *cred)
+{
+       struct inode *inode = path->dentry->d_inode;
+
+       if (inode->i_op->dentry_open)
+               return inode->i_op->dentry_open(path->dentry, filp, cred);
+       else {
+               filp->f_path = *path;
+               return do_dentry_open(filp, NULL, cred);
+       }
+}
+EXPORT_SYMBOL(vfs_open);
+
 static inline int build_open_flags(int flags, umode_t mode, struct open_flags *op)
 {
        int lookup_flags = 0;
diff --git a/fs/overlayfs/Kconfig b/fs/overlayfs/Kconfig
new file mode 100644 (file)
index 0000000..e601259
--- /dev/null
@@ -0,0 +1,10 @@
+config OVERLAYFS_FS
+       tristate "Overlay filesystem support"
+       help
+         An overlay filesystem combines two filesystems - an 'upper' filesystem
+         and a 'lower' filesystem.  When a name exists in both filesystems, the
+         object in the 'upper' filesystem is visible while the object in the
+         'lower' filesystem is either hidden or, in the case of directories,
+         merged with the 'upper' object.
+
+         For more information see Documentation/filesystems/overlayfs.txt
diff --git a/fs/overlayfs/Makefile b/fs/overlayfs/Makefile
new file mode 100644 (file)
index 0000000..8f91889
--- /dev/null
@@ -0,0 +1,7 @@
+#
+# Makefile for the overlay filesystem.
+#
+
+obj-$(CONFIG_OVERLAYFS_FS) += overlayfs.o
+
+overlayfs-objs := super.o inode.o dir.o readdir.o copy_up.o
diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c
new file mode 100644 (file)
index 0000000..ea10a87
--- /dev/null
@@ -0,0 +1,414 @@
+/*
+ *
+ * Copyright (C) 2011 Novell Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/file.h>
+#include <linux/splice.h>
+#include <linux/xattr.h>
+#include <linux/security.h>
+#include <linux/uaccess.h>
+#include <linux/sched.h>
+#include <linux/namei.h>
+#include "overlayfs.h"
+
+#define OVL_COPY_UP_CHUNK_SIZE (1 << 20)
+
+int ovl_copy_xattr(struct dentry *old, struct dentry *new)
+{
+       ssize_t list_size, size;
+       char *buf, *name, *value;
+       int error;
+
+       if (!old->d_inode->i_op->getxattr ||
+           !new->d_inode->i_op->getxattr)
+               return 0;
+
+       list_size = vfs_listxattr(old, NULL, 0);
+       if (list_size <= 0) {
+               if (list_size == -EOPNOTSUPP)
+                       return 0;
+               return list_size;
+       }
+
+       buf = kzalloc(list_size, GFP_KERNEL);
+       if (!buf)
+               return -ENOMEM;
+
+       error = -ENOMEM;
+       value = kmalloc(XATTR_SIZE_MAX, GFP_KERNEL);
+       if (!value)
+               goto out;
+
+       list_size = vfs_listxattr(old, buf, list_size);
+       if (list_size <= 0) {
+               error = list_size;
+               goto out_free_value;
+       }
+
+       for (name = buf; name < (buf + list_size); name += strlen(name) + 1) {
+               size = vfs_getxattr(old, name, value, XATTR_SIZE_MAX);
+               if (size <= 0) {
+                       error = size;
+                       goto out_free_value;
+               }
+               error = vfs_setxattr(new, name, value, size, 0);
+               if (error)
+                       goto out_free_value;
+       }
+
+out_free_value:
+       kfree(value);
+out:
+       kfree(buf);
+       return error;
+}
+
+static int ovl_copy_up_data(struct path *old, struct path *new, loff_t len)
+{
+       struct file *old_file;
+       struct file *new_file;
+       loff_t old_pos = 0;
+       loff_t new_pos = 0;
+       int error = 0;
+
+       if (len == 0)
+               return 0;
+
+       old_file = ovl_path_open(old, O_RDONLY);
+       if (IS_ERR(old_file))
+               return PTR_ERR(old_file);
+
+       new_file = ovl_path_open(new, O_WRONLY);
+       if (IS_ERR(new_file)) {
+               error = PTR_ERR(new_file);
+               goto out_fput;
+       }
+
+       /* FIXME: copy up sparse files efficiently */
+       while (len) {
+               size_t this_len = OVL_COPY_UP_CHUNK_SIZE;
+               long bytes;
+
+               if (len < this_len)
+                       this_len = len;
+
+               if (signal_pending_state(TASK_KILLABLE, current)) {
+                       error = -EINTR;
+                       break;
+               }
+
+               bytes = do_splice_direct(old_file, &old_pos,
+                                        new_file, &new_pos,
+                                        this_len, SPLICE_F_MOVE);
+               if (bytes <= 0) {
+                       error = bytes;
+                       break;
+               }
+               WARN_ON(old_pos != new_pos);
+
+               len -= bytes;
+       }
+
+       fput(new_file);
+out_fput:
+       fput(old_file);
+       return error;
+}
+
+static char *ovl_read_symlink(struct dentry *realdentry)
+{
+       int res;
+       char *buf;
+       struct inode *inode = realdentry->d_inode;
+       mm_segment_t old_fs;
+
+       res = -EINVAL;
+       if (!inode->i_op->readlink)
+               goto err;
+
+       res = -ENOMEM;
+       buf = (char *) __get_free_page(GFP_KERNEL);
+       if (!buf)
+               goto err;
+
+       old_fs = get_fs();
+       set_fs(get_ds());
+       /* The cast to a user pointer is valid due to the set_fs() */
+       res = inode->i_op->readlink(realdentry,
+                                   (char __user *)buf, PAGE_SIZE - 1);
+       set_fs(old_fs);
+       if (res < 0) {
+               free_page((unsigned long) buf);
+               goto err;
+       }
+       buf[res] = '\0';
+
+       return buf;
+
+err:
+       return ERR_PTR(res);
+}
+
+static int ovl_set_timestamps(struct dentry *upperdentry, struct kstat *stat)
+{
+       struct iattr attr = {
+               .ia_valid =
+                    ATTR_ATIME | ATTR_MTIME | ATTR_ATIME_SET | ATTR_MTIME_SET,
+               .ia_atime = stat->atime,
+               .ia_mtime = stat->mtime,
+       };
+
+       return notify_change(upperdentry, &attr, NULL);
+}
+
+int ovl_set_attr(struct dentry *upperdentry, struct kstat *stat)
+{
+       int err = 0;
+
+       if (!S_ISLNK(stat->mode)) {
+               struct iattr attr = {
+                       .ia_valid = ATTR_MODE,
+                       .ia_mode = stat->mode,
+               };
+               err = notify_change(upperdentry, &attr, NULL);
+       }
+       if (!err) {
+               struct iattr attr = {
+                       .ia_valid = ATTR_UID | ATTR_GID,
+                       .ia_uid = stat->uid,
+                       .ia_gid = stat->gid,
+               };
+               err = notify_change(upperdentry, &attr, NULL);
+       }
+       if (!err)
+               ovl_set_timestamps(upperdentry, stat);
+
+       return err;
+
+}
+
+static int ovl_copy_up_locked(struct dentry *workdir, struct dentry *upperdir,
+                             struct dentry *dentry, struct path *lowerpath,
+                             struct kstat *stat, struct iattr *attr,
+                             const char *link)
+{
+       struct inode *wdir = workdir->d_inode;
+       struct inode *udir = upperdir->d_inode;
+       struct dentry *newdentry = NULL;
+       struct dentry *upper = NULL;
+       umode_t mode = stat->mode;
+       int err;
+
+       newdentry = ovl_lookup_temp(workdir, dentry);
+       err = PTR_ERR(newdentry);
+       if (IS_ERR(newdentry))
+               goto out;
+
+       upper = lookup_one_len(dentry->d_name.name, upperdir,
+                              dentry->d_name.len);
+       err = PTR_ERR(upper);
+       if (IS_ERR(upper))
+               goto out1;
+
+       /* Can't properly set mode on creation because of the umask */
+       stat->mode &= S_IFMT;
+       err = ovl_create_real(wdir, newdentry, stat, link, NULL, true);
+       stat->mode = mode;
+       if (err)
+               goto out2;
+
+       if (S_ISREG(stat->mode)) {
+               struct path upperpath;
+               ovl_path_upper(dentry, &upperpath);
+               BUG_ON(upperpath.dentry != NULL);
+               upperpath.dentry = newdentry;
+
+               err = ovl_copy_up_data(lowerpath, &upperpath, stat->size);
+               if (err)
+                       goto out_cleanup;
+       }
+
+       err = ovl_copy_xattr(lowerpath->dentry, newdentry);
+       if (err)
+               goto out_cleanup;
+
+       mutex_lock(&newdentry->d_inode->i_mutex);
+       err = ovl_set_attr(newdentry, stat);
+       if (!err && attr)
+               err = notify_change(newdentry, attr, NULL);
+       mutex_unlock(&newdentry->d_inode->i_mutex);
+       if (err)
+               goto out_cleanup;
+
+       err = ovl_do_rename(wdir, newdentry, udir, upper, 0);
+       if (err)
+               goto out_cleanup;
+
+       ovl_dentry_update(dentry, newdentry);
+       newdentry = NULL;
+
+       /*
+        * Non-directores become opaque when copied up.
+        */
+       if (!S_ISDIR(stat->mode))
+               ovl_dentry_set_opaque(dentry, true);
+out2:
+       dput(upper);
+out1:
+       dput(newdentry);
+out:
+       return err;
+
+out_cleanup:
+       ovl_cleanup(wdir, newdentry);
+       goto out;
+}
+
+/*
+ * Copy up a single dentry
+ *
+ * Directory renames only allowed on "pure upper" (already created on
+ * upper filesystem, never copied up).  Directories which are on lower or
+ * are merged may not be renamed.  For these -EXDEV is returned and
+ * userspace has to deal with it.  This means, when copying up a
+ * directory we can rely on it and ancestors being stable.
+ *
+ * Non-directory renames start with copy up of source if necessary.  The
+ * actual rename will only proceed once the copy up was successful.  Copy
+ * up uses upper parent i_mutex for exclusion.  Since rename can change
+ * d_parent it is possible that the copy up will lock the old parent.  At
+ * that point the file will have already been copied up anyway.
+ */
+int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry,
+                   struct path *lowerpath, struct kstat *stat,
+                   struct iattr *attr)
+{
+       struct dentry *workdir = ovl_workdir(dentry);
+       int err;
+       struct kstat pstat;
+       struct path parentpath;
+       struct dentry *upperdir;
+       struct dentry *upperdentry;
+       const struct cred *old_cred;
+       struct cred *override_cred;
+       char *link = NULL;
+
+       ovl_path_upper(parent, &parentpath);
+       upperdir = parentpath.dentry;
+
+       err = vfs_getattr(&parentpath, &pstat);
+       if (err)
+               return err;
+
+       if (S_ISLNK(stat->mode)) {
+               link = ovl_read_symlink(lowerpath->dentry);
+               if (IS_ERR(link))
+                       return PTR_ERR(link);
+       }
+
+       err = -ENOMEM;
+       override_cred = prepare_creds();
+       if (!override_cred)
+               goto out_free_link;
+
+       override_cred->fsuid = stat->uid;
+       override_cred->fsgid = stat->gid;
+       /*
+        * CAP_SYS_ADMIN for copying up extended attributes
+        * CAP_DAC_OVERRIDE for create
+        * CAP_FOWNER for chmod, timestamp update
+        * CAP_FSETID for chmod
+        * CAP_CHOWN for chown
+        * CAP_MKNOD for mknod
+        */
+       cap_raise(override_cred->cap_effective, CAP_SYS_ADMIN);
+       cap_raise(override_cred->cap_effective, CAP_DAC_OVERRIDE);
+       cap_raise(override_cred->cap_effective, CAP_FOWNER);
+       cap_raise(override_cred->cap_effective, CAP_FSETID);
+       cap_raise(override_cred->cap_effective, CAP_CHOWN);
+       cap_raise(override_cred->cap_effective, CAP_MKNOD);
+       old_cred = override_creds(override_cred);
+
+       err = -EIO;
+       if (lock_rename(workdir, upperdir) != NULL) {
+               pr_err("overlayfs: failed to lock workdir+upperdir\n");
+               goto out_unlock;
+       }
+       upperdentry = ovl_dentry_upper(dentry);
+       if (upperdentry) {
+               unlock_rename(workdir, upperdir);
+               err = 0;
+               /* Raced with another copy-up?  Do the setattr here */
+               if (attr) {
+                       mutex_lock(&upperdentry->d_inode->i_mutex);
+                       err = notify_change(upperdentry, attr, NULL);
+                       mutex_unlock(&upperdentry->d_inode->i_mutex);
+               }
+               goto out_put_cred;
+       }
+
+       err = ovl_copy_up_locked(workdir, upperdir, dentry, lowerpath,
+                                stat, attr, link);
+       if (!err) {
+               /* Restore timestamps on parent (best effort) */
+               ovl_set_timestamps(upperdir, &pstat);
+       }
+out_unlock:
+       unlock_rename(workdir, upperdir);
+out_put_cred:
+       revert_creds(old_cred);
+       put_cred(override_cred);
+
+out_free_link:
+       if (link)
+               free_page((unsigned long) link);
+
+       return err;
+}
+
+int ovl_copy_up(struct dentry *dentry)
+{
+       int err;
+
+       err = 0;
+       while (!err) {
+               struct dentry *next;
+               struct dentry *parent;
+               struct path lowerpath;
+               struct kstat stat;
+               enum ovl_path_type type = ovl_path_type(dentry);
+
+               if (type != OVL_PATH_LOWER)
+                       break;
+
+               next = dget(dentry);
+               /* find the topmost dentry not yet copied up */
+               for (;;) {
+                       parent = dget_parent(next);
+
+                       type = ovl_path_type(parent);
+                       if (type != OVL_PATH_LOWER)
+                               break;
+
+                       dput(next);
+                       next = parent;
+               }
+
+               ovl_path_lower(next, &lowerpath);
+               err = vfs_getattr(&lowerpath, &stat);
+               if (!err)
+                       err = ovl_copy_up_one(parent, next, &lowerpath, &stat, NULL);
+
+               dput(parent);
+               dput(next);
+       }
+
+       return err;
+}
diff --git a/fs/overlayfs/dir.c b/fs/overlayfs/dir.c
new file mode 100644 (file)
index 0000000..15cd91a
--- /dev/null
@@ -0,0 +1,921 @@
+/*
+ *
+ * Copyright (C) 2011 Novell Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+#include <linux/fs.h>
+#include <linux/namei.h>
+#include <linux/xattr.h>
+#include <linux/security.h>
+#include <linux/cred.h>
+#include "overlayfs.h"
+
+void ovl_cleanup(struct inode *wdir, struct dentry *wdentry)
+{
+       int err;
+
+       dget(wdentry);
+       if (S_ISDIR(wdentry->d_inode->i_mode))
+               err = ovl_do_rmdir(wdir, wdentry);
+       else
+               err = ovl_do_unlink(wdir, wdentry);
+       dput(wdentry);
+
+       if (err) {
+               pr_err("overlayfs: cleanup of '%pd2' failed (%i)\n",
+                      wdentry, err);
+       }
+}
+
+struct dentry *ovl_lookup_temp(struct dentry *workdir, struct dentry *dentry)
+{
+       struct dentry *temp;
+       char name[20];
+
+       snprintf(name, sizeof(name), "#%lx", (unsigned long) dentry);
+
+       temp = lookup_one_len(name, workdir, strlen(name));
+       if (!IS_ERR(temp) && temp->d_inode) {
+               pr_err("overlayfs: workdir/%s already exists\n", name);
+               dput(temp);
+               temp = ERR_PTR(-EIO);
+       }
+
+       return temp;
+}
+
+/* caller holds i_mutex on workdir */
+static struct dentry *ovl_whiteout(struct dentry *workdir,
+                                  struct dentry *dentry)
+{
+       int err;
+       struct dentry *whiteout;
+       struct inode *wdir = workdir->d_inode;
+
+       whiteout = ovl_lookup_temp(workdir, dentry);
+       if (IS_ERR(whiteout))
+               return whiteout;
+
+       err = ovl_do_whiteout(wdir, whiteout);
+       if (err) {
+               dput(whiteout);
+               whiteout = ERR_PTR(err);
+       }
+
+       return whiteout;
+}
+
+int ovl_create_real(struct inode *dir, struct dentry *newdentry,
+                   struct kstat *stat, const char *link,
+                   struct dentry *hardlink, bool debug)
+{
+       int err;
+
+       if (newdentry->d_inode)
+               return -ESTALE;
+
+       if (hardlink) {
+               err = ovl_do_link(hardlink, dir, newdentry, debug);
+       } else {
+               switch (stat->mode & S_IFMT) {
+               case S_IFREG:
+                       err = ovl_do_create(dir, newdentry, stat->mode, debug);
+                       break;
+
+               case S_IFDIR:
+                       err = ovl_do_mkdir(dir, newdentry, stat->mode, debug);
+                       break;
+
+               case S_IFCHR:
+               case S_IFBLK:
+               case S_IFIFO:
+               case S_IFSOCK:
+                       err = ovl_do_mknod(dir, newdentry,
+                                          stat->mode, stat->rdev, debug);
+                       break;
+
+               case S_IFLNK:
+                       err = ovl_do_symlink(dir, newdentry, link, debug);
+                       break;
+
+               default:
+                       err = -EPERM;
+               }
+       }
+       if (!err && WARN_ON(!newdentry->d_inode)) {
+               /*
+                * Not quite sure if non-instantiated dentry is legal or not.
+                * VFS doesn't seem to care so check and warn here.
+                */
+               err = -ENOENT;
+       }
+       return err;
+}
+
+static int ovl_set_opaque(struct dentry *upperdentry)
+{
+       return ovl_do_setxattr(upperdentry, ovl_opaque_xattr, "y", 1, 0);
+}
+
+static void ovl_remove_opaque(struct dentry *upperdentry)
+{
+       int err;
+
+       err = ovl_do_removexattr(upperdentry, ovl_opaque_xattr);
+       if (err) {
+               pr_warn("overlayfs: failed to remove opaque from '%s' (%i)\n",
+                       upperdentry->d_name.name, err);
+       }
+}
+
+static int ovl_dir_getattr(struct vfsmount *mnt, struct dentry *dentry,
+                        struct kstat *stat)
+{
+       int err;
+       enum ovl_path_type type;
+       struct path realpath;
+
+       type = ovl_path_real(dentry, &realpath);
+       err = vfs_getattr(&realpath, stat);
+       if (err)
+               return err;
+
+       stat->dev = dentry->d_sb->s_dev;
+       stat->ino = dentry->d_inode->i_ino;
+
+       /*
+        * It's probably not worth it to count subdirs to get the
+        * correct link count.  nlink=1 seems to pacify 'find' and
+        * other utilities.
+        */
+       if (type == OVL_PATH_MERGE)
+               stat->nlink = 1;
+
+       return 0;
+}
+
+static int ovl_create_upper(struct dentry *dentry, struct inode *inode,
+                           struct kstat *stat, const char *link,
+                           struct dentry *hardlink)
+{
+       struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
+       struct inode *udir = upperdir->d_inode;
+       struct dentry *newdentry;
+       int err;
+
+       mutex_lock_nested(&udir->i_mutex, I_MUTEX_PARENT);
+       newdentry = lookup_one_len(dentry->d_name.name, upperdir,
+                                  dentry->d_name.len);
+       err = PTR_ERR(newdentry);
+       if (IS_ERR(newdentry))
+               goto out_unlock;
+       err = ovl_create_real(udir, newdentry, stat, link, hardlink, false);
+       if (err)
+               goto out_dput;
+
+       ovl_dentry_version_inc(dentry->d_parent);
+       ovl_dentry_update(dentry, newdentry);
+       ovl_copyattr(newdentry->d_inode, inode);
+       d_instantiate(dentry, inode);
+       newdentry = NULL;
+out_dput:
+       dput(newdentry);
+out_unlock:
+       mutex_unlock(&udir->i_mutex);
+       return err;
+}
+
+static int ovl_lock_rename_workdir(struct dentry *workdir,
+                                  struct dentry *upperdir)
+{
+       /* Workdir should not be the same as upperdir */
+       if (workdir == upperdir)
+               goto err;
+
+       /* Workdir should not be subdir of upperdir and vice versa */
+       if (lock_rename(workdir, upperdir) != NULL)
+               goto err_unlock;
+
+       return 0;
+
+err_unlock:
+       unlock_rename(workdir, upperdir);
+err:
+       pr_err("overlayfs: failed to lock workdir+upperdir\n");
+       return -EIO;
+}
+
+static struct dentry *ovl_clear_empty(struct dentry *dentry,
+                                     struct list_head *list)
+{
+       struct dentry *workdir = ovl_workdir(dentry);
+       struct inode *wdir = workdir->d_inode;
+       struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
+       struct inode *udir = upperdir->d_inode;
+       struct path upperpath;
+       struct dentry *upper;
+       struct dentry *opaquedir;
+       struct kstat stat;
+       int err;
+
+       err = ovl_lock_rename_workdir(workdir, upperdir);
+       if (err)
+               goto out;
+
+       ovl_path_upper(dentry, &upperpath);
+       err = vfs_getattr(&upperpath, &stat);
+       if (err)
+               goto out_unlock;
+
+       err = -ESTALE;
+       if (!S_ISDIR(stat.mode))
+               goto out_unlock;
+       upper = upperpath.dentry;
+       if (upper->d_parent->d_inode != udir)
+               goto out_unlock;
+
+       opaquedir = ovl_lookup_temp(workdir, dentry);
+       err = PTR_ERR(opaquedir);
+       if (IS_ERR(opaquedir))
+               goto out_unlock;
+
+       err = ovl_create_real(wdir, opaquedir, &stat, NULL, NULL, true);
+       if (err)
+               goto out_dput;
+
+       err = ovl_copy_xattr(upper, opaquedir);
+       if (err)
+               goto out_cleanup;
+
+       err = ovl_set_opaque(opaquedir);
+       if (err)
+               goto out_cleanup;
+
+       mutex_lock(&opaquedir->d_inode->i_mutex);
+       err = ovl_set_attr(opaquedir, &stat);
+       mutex_unlock(&opaquedir->d_inode->i_mutex);
+       if (err)
+               goto out_cleanup;
+
+       err = ovl_do_rename(wdir, opaquedir, udir, upper, RENAME_EXCHANGE);
+       if (err)
+               goto out_cleanup;
+
+       ovl_cleanup_whiteouts(upper, list);
+       ovl_cleanup(wdir, upper);
+       unlock_rename(workdir, upperdir);
+
+       /* dentry's upper doesn't match now, get rid of it */
+       d_drop(dentry);
+
+       return opaquedir;
+
+out_cleanup:
+       ovl_cleanup(wdir, opaquedir);
+out_dput:
+       dput(opaquedir);
+out_unlock:
+       unlock_rename(workdir, upperdir);
+out:
+       return ERR_PTR(err);
+}
+
+static struct dentry *ovl_check_empty_and_clear(struct dentry *dentry,
+                                               enum ovl_path_type type)
+{
+       int err;
+       struct dentry *ret = NULL;
+       LIST_HEAD(list);
+
+       err = ovl_check_empty_dir(dentry, &list);
+       if (err)
+               ret = ERR_PTR(err);
+       else if (type == OVL_PATH_MERGE)
+               ret = ovl_clear_empty(dentry, &list);
+
+       ovl_cache_free(&list);
+
+       return ret;
+}
+
+static int ovl_create_over_whiteout(struct dentry *dentry, struct inode *inode,
+                                   struct kstat *stat, const char *link,
+                                   struct dentry *hardlink)
+{
+       struct dentry *workdir = ovl_workdir(dentry);
+       struct inode *wdir = workdir->d_inode;
+       struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
+       struct inode *udir = upperdir->d_inode;
+       struct dentry *upper;
+       struct dentry *newdentry;
+       int err;
+
+       err = ovl_lock_rename_workdir(workdir, upperdir);
+       if (err)
+               goto out;
+
+       newdentry = ovl_lookup_temp(workdir, dentry);
+       err = PTR_ERR(newdentry);
+       if (IS_ERR(newdentry))
+               goto out_unlock;
+
+       upper = lookup_one_len(dentry->d_name.name, upperdir,
+                              dentry->d_name.len);
+       err = PTR_ERR(upper);
+       if (IS_ERR(upper))
+               goto out_dput;
+
+       err = ovl_create_real(wdir, newdentry, stat, link, hardlink, true);
+       if (err)
+               goto out_dput2;
+
+       if (S_ISDIR(stat->mode)) {
+               err = ovl_set_opaque(newdentry);
+               if (err)
+                       goto out_cleanup;
+
+               err = ovl_do_rename(wdir, newdentry, udir, upper,
+                                   RENAME_EXCHANGE);
+               if (err)
+                       goto out_cleanup;
+
+               ovl_cleanup(wdir, upper);
+       } else {
+               err = ovl_do_rename(wdir, newdentry, udir, upper, 0);
+               if (err)
+                       goto out_cleanup;
+       }
+       ovl_dentry_version_inc(dentry->d_parent);
+       ovl_dentry_update(dentry, newdentry);
+       ovl_copyattr(newdentry->d_inode, inode);
+       d_instantiate(dentry, inode);
+       newdentry = NULL;
+out_dput2:
+       dput(upper);
+out_dput:
+       dput(newdentry);
+out_unlock:
+       unlock_rename(workdir, upperdir);
+out:
+       return err;
+
+out_cleanup:
+       ovl_cleanup(wdir, newdentry);
+       goto out_dput2;
+}
+
+static int ovl_create_or_link(struct dentry *dentry, int mode, dev_t rdev,
+                             const char *link, struct dentry *hardlink)
+{
+       int err;
+       struct inode *inode;
+       struct kstat stat = {
+               .mode = mode,
+               .rdev = rdev,
+       };
+
+       err = -ENOMEM;
+       inode = ovl_new_inode(dentry->d_sb, mode, dentry->d_fsdata);
+       if (!inode)
+               goto out;
+
+       err = ovl_copy_up(dentry->d_parent);
+       if (err)
+               goto out_iput;
+
+       if (!ovl_dentry_is_opaque(dentry)) {
+               err = ovl_create_upper(dentry, inode, &stat, link, hardlink);
+       } else {
+               const struct cred *old_cred;
+               struct cred *override_cred;
+
+               err = -ENOMEM;
+               override_cred = prepare_creds();
+               if (!override_cred)
+                       goto out_iput;
+
+               /*
+                * CAP_SYS_ADMIN for setting opaque xattr
+                * CAP_DAC_OVERRIDE for create in workdir, rename
+                * CAP_FOWNER for removing whiteout from sticky dir
+                */
+               cap_raise(override_cred->cap_effective, CAP_SYS_ADMIN);
+               cap_raise(override_cred->cap_effective, CAP_DAC_OVERRIDE);
+               cap_raise(override_cred->cap_effective, CAP_FOWNER);
+               old_cred = override_creds(override_cred);
+
+               err = ovl_create_over_whiteout(dentry, inode, &stat, link,
+                                              hardlink);
+
+               revert_creds(old_cred);
+               put_cred(override_cred);
+       }
+
+       if (!err)
+               inode = NULL;
+out_iput:
+       iput(inode);
+out:
+       return err;
+}
+
+static int ovl_create_object(struct dentry *dentry, int mode, dev_t rdev,
+                            const char *link)
+{
+       int err;
+
+       err = ovl_want_write(dentry);
+       if (!err) {
+               err = ovl_create_or_link(dentry, mode, rdev, link, NULL);
+               ovl_drop_write(dentry);
+       }
+
+       return err;
+}
+
+static int ovl_create(struct inode *dir, struct dentry *dentry, umode_t mode,
+                     bool excl)
+{
+       return ovl_create_object(dentry, (mode & 07777) | S_IFREG, 0, NULL);
+}
+
+static int ovl_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+{
+       return ovl_create_object(dentry, (mode & 07777) | S_IFDIR, 0, NULL);
+}
+
+static int ovl_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
+                    dev_t rdev)
+{
+       /* Don't allow creation of "whiteout" on overlay */
+       if (S_ISCHR(mode) && rdev == WHITEOUT_DEV)
+               return -EPERM;
+
+       return ovl_create_object(dentry, mode, rdev, NULL);
+}
+
+static int ovl_symlink(struct inode *dir, struct dentry *dentry,
+                      const char *link)
+{
+       return ovl_create_object(dentry, S_IFLNK, 0, link);
+}
+
+static int ovl_link(struct dentry *old, struct inode *newdir,
+                   struct dentry *new)
+{
+       int err;
+       struct dentry *upper;
+
+       err = ovl_want_write(old);
+       if (err)
+               goto out;
+
+       err = ovl_copy_up(old);
+       if (err)
+               goto out_drop_write;
+
+       upper = ovl_dentry_upper(old);
+       err = ovl_create_or_link(new, upper->d_inode->i_mode, 0, NULL, upper);
+
+out_drop_write:
+       ovl_drop_write(old);
+out:
+       return err;
+}
+
+static int ovl_remove_and_whiteout(struct dentry *dentry,
+                                  enum ovl_path_type type, bool is_dir)
+{
+       struct dentry *workdir = ovl_workdir(dentry);
+       struct inode *wdir = workdir->d_inode;
+       struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
+       struct inode *udir = upperdir->d_inode;
+       struct dentry *whiteout;
+       struct dentry *upper;
+       struct dentry *opaquedir = NULL;
+       int err;
+
+       if (is_dir) {
+               opaquedir = ovl_check_empty_and_clear(dentry, type);
+               err = PTR_ERR(opaquedir);
+               if (IS_ERR(opaquedir))
+                       goto out;
+       }
+
+       err = ovl_lock_rename_workdir(workdir, upperdir);
+       if (err)
+               goto out_dput;
+
+       whiteout = ovl_whiteout(workdir, dentry);
+       err = PTR_ERR(whiteout);
+       if (IS_ERR(whiteout))
+               goto out_unlock;
+
+       if (type == OVL_PATH_LOWER) {
+               upper = lookup_one_len(dentry->d_name.name, upperdir,
+                                          dentry->d_name.len);
+               err = PTR_ERR(upper);
+               if (IS_ERR(upper))
+                       goto kill_whiteout;
+
+               err = ovl_do_rename(wdir, whiteout, udir, upper, 0);
+               dput(upper);
+               if (err)
+                       goto kill_whiteout;
+       } else {
+               int flags = 0;
+
+               upper = ovl_dentry_upper(dentry);
+               if (opaquedir)
+                       upper = opaquedir;
+               err = -ESTALE;
+               if (upper->d_parent != upperdir)
+                       goto kill_whiteout;
+
+               if (is_dir)
+                       flags |= RENAME_EXCHANGE;
+
+               err = ovl_do_rename(wdir, whiteout, udir, upper, flags);
+               if (err)
+                       goto kill_whiteout;
+
+               if (is_dir)
+                       ovl_cleanup(wdir, upper);
+       }
+       ovl_dentry_version_inc(dentry->d_parent);
+out_d_drop:
+       d_drop(dentry);
+       dput(whiteout);
+out_unlock:
+       unlock_rename(workdir, upperdir);
+out_dput:
+       dput(opaquedir);
+out:
+       return err;
+
+kill_whiteout:
+       ovl_cleanup(wdir, whiteout);
+       goto out_d_drop;
+}
+
+static int ovl_remove_upper(struct dentry *dentry, bool is_dir)
+{
+       struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
+       struct inode *dir = upperdir->d_inode;
+       struct dentry *upper = ovl_dentry_upper(dentry);
+       int err;
+
+       mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
+       err = -ESTALE;
+       if (upper->d_parent == upperdir) {
+               /* Don't let d_delete() think it can reset d_inode */
+               dget(upper);
+               if (is_dir)
+                       err = vfs_rmdir(dir, upper);
+               else
+                       err = vfs_unlink(dir, upper, NULL);
+               dput(upper);
+               ovl_dentry_version_inc(dentry->d_parent);
+       }
+
+       /*
+        * Keeping this dentry hashed would mean having to release
+        * upperpath/lowerpath, which could only be done if we are the
+        * sole user of this dentry.  Too tricky...  Just unhash for
+        * now.
+        */
+       d_drop(dentry);
+       mutex_unlock(&dir->i_mutex);
+
+       return err;
+}
+
+static inline int ovl_check_sticky(struct dentry *dentry)
+{
+       struct inode *dir = ovl_dentry_real(dentry->d_parent)->d_inode;
+       struct inode *inode = ovl_dentry_real(dentry)->d_inode;
+
+       if (check_sticky(dir, inode))
+               return -EPERM;
+
+       return 0;
+}
+
+static int ovl_do_remove(struct dentry *dentry, bool is_dir)
+{
+       enum ovl_path_type type;
+       int err;
+
+       err = ovl_check_sticky(dentry);
+       if (err)
+               goto out;
+
+       err = ovl_want_write(dentry);
+       if (err)
+               goto out;
+
+       err = ovl_copy_up(dentry->d_parent);
+       if (err)
+               goto out_drop_write;
+
+       type = ovl_path_type(dentry);
+       if (type == OVL_PATH_PURE_UPPER) {
+               err = ovl_remove_upper(dentry, is_dir);
+       } else {
+               const struct cred *old_cred;
+               struct cred *override_cred;
+
+               err = -ENOMEM;
+               override_cred = prepare_creds();
+               if (!override_cred)
+                       goto out_drop_write;
+
+               /*
+                * CAP_SYS_ADMIN for setting xattr on whiteout, opaque dir
+                * CAP_DAC_OVERRIDE for create in workdir, rename
+                * CAP_FOWNER for removing whiteout from sticky dir
+                * CAP_FSETID for chmod of opaque dir
+                * CAP_CHOWN for chown of opaque dir
+                */
+               cap_raise(override_cred->cap_effective, CAP_SYS_ADMIN);
+               cap_raise(override_cred->cap_effective, CAP_DAC_OVERRIDE);
+               cap_raise(override_cred->cap_effective, CAP_FOWNER);
+               cap_raise(override_cred->cap_effective, CAP_FSETID);
+               cap_raise(override_cred->cap_effective, CAP_CHOWN);
+               old_cred = override_creds(override_cred);
+
+               err = ovl_remove_and_whiteout(dentry, type, is_dir);
+
+               revert_creds(old_cred);
+               put_cred(override_cred);
+       }
+out_drop_write:
+       ovl_drop_write(dentry);
+out:
+       return err;
+}
+
+static int ovl_unlink(struct inode *dir, struct dentry *dentry)
+{
+       return ovl_do_remove(dentry, false);
+}
+
+static int ovl_rmdir(struct inode *dir, struct dentry *dentry)
+{
+       return ovl_do_remove(dentry, true);
+}
+
+static int ovl_rename2(struct inode *olddir, struct dentry *old,
+                      struct inode *newdir, struct dentry *new,
+                      unsigned int flags)
+{
+       int err;
+       enum ovl_path_type old_type;
+       enum ovl_path_type new_type;
+       struct dentry *old_upperdir;
+       struct dentry *new_upperdir;
+       struct dentry *olddentry;
+       struct dentry *newdentry;
+       struct dentry *trap;
+       bool old_opaque;
+       bool new_opaque;
+       bool new_create = false;
+       bool cleanup_whiteout = false;
+       bool overwrite = !(flags & RENAME_EXCHANGE);
+       bool is_dir = S_ISDIR(old->d_inode->i_mode);
+       bool new_is_dir = false;
+       struct dentry *opaquedir = NULL;
+       const struct cred *old_cred = NULL;
+       struct cred *override_cred = NULL;
+
+       err = -EINVAL;
+       if (flags & ~(RENAME_EXCHANGE | RENAME_NOREPLACE))
+               goto out;
+
+       flags &= ~RENAME_NOREPLACE;
+
+       err = ovl_check_sticky(old);
+       if (err)
+               goto out;
+
+       /* Don't copy up directory trees */
+       old_type = ovl_path_type(old);
+       err = -EXDEV;
+       if ((old_type == OVL_PATH_LOWER || old_type == OVL_PATH_MERGE) && is_dir)
+               goto out;
+
+       if (new->d_inode) {
+               err = ovl_check_sticky(new);
+               if (err)
+                       goto out;
+
+               if (S_ISDIR(new->d_inode->i_mode))
+                       new_is_dir = true;
+
+               new_type = ovl_path_type(new);
+               err = -EXDEV;
+               if (!overwrite && (new_type == OVL_PATH_LOWER || new_type == OVL_PATH_MERGE) && new_is_dir)
+                       goto out;
+
+               err = 0;
+               if (new_type == OVL_PATH_LOWER && old_type == OVL_PATH_LOWER) {
+                       if (ovl_dentry_lower(old)->d_inode ==
+                           ovl_dentry_lower(new)->d_inode)
+                               goto out;
+               }
+               if (new_type != OVL_PATH_LOWER && old_type != OVL_PATH_LOWER) {
+                       if (ovl_dentry_upper(old)->d_inode ==
+                           ovl_dentry_upper(new)->d_inode)
+                               goto out;
+               }
+       } else {
+               if (ovl_dentry_is_opaque(new))
+                       new_type = OVL_PATH_UPPER;
+               else
+                       new_type = OVL_PATH_PURE_UPPER;
+       }
+
+       err = ovl_want_write(old);
+       if (err)
+               goto out;
+
+       err = ovl_copy_up(old);
+       if (err)
+               goto out_drop_write;
+
+       err = ovl_copy_up(new->d_parent);
+       if (err)
+               goto out_drop_write;
+       if (!overwrite) {
+               err = ovl_copy_up(new);
+               if (err)
+                       goto out_drop_write;
+       }
+
+       old_opaque = old_type != OVL_PATH_PURE_UPPER;
+       new_opaque = new_type != OVL_PATH_PURE_UPPER;
+
+       if (old_opaque || new_opaque) {
+               err = -ENOMEM;
+               override_cred = prepare_creds();
+               if (!override_cred)
+                       goto out_drop_write;
+
+               /*
+                * CAP_SYS_ADMIN for setting xattr on whiteout, opaque dir
+                * CAP_DAC_OVERRIDE for create in workdir
+                * CAP_FOWNER for removing whiteout from sticky dir
+                * CAP_FSETID for chmod of opaque dir
+                * CAP_CHOWN for chown of opaque dir
+                */
+               cap_raise(override_cred->cap_effective, CAP_SYS_ADMIN);
+               cap_raise(override_cred->cap_effective, CAP_DAC_OVERRIDE);
+               cap_raise(override_cred->cap_effective, CAP_FOWNER);
+               cap_raise(override_cred->cap_effective, CAP_FSETID);
+               cap_raise(override_cred->cap_effective, CAP_CHOWN);
+               old_cred = override_creds(override_cred);
+       }
+
+       if (overwrite && (new_type == OVL_PATH_LOWER || new_type == OVL_PATH_MERGE) && new_is_dir) {
+               opaquedir = ovl_check_empty_and_clear(new, new_type);
+               err = PTR_ERR(opaquedir);
+               if (IS_ERR(opaquedir)) {
+                       opaquedir = NULL;
+                       goto out_revert_creds;
+               }
+       }
+
+       if (overwrite) {
+               if (old_opaque) {
+                       if (new->d_inode || !new_opaque) {
+                               /* Whiteout source */
+                               flags |= RENAME_WHITEOUT;
+                       } else {
+                               /* Switch whiteouts */
+                               flags |= RENAME_EXCHANGE;
+                       }
+               } else if (is_dir && !new->d_inode && new_opaque) {
+                       flags |= RENAME_EXCHANGE;
+                       cleanup_whiteout = true;
+               }
+       }
+
+       old_upperdir = ovl_dentry_upper(old->d_parent);
+       new_upperdir = ovl_dentry_upper(new->d_parent);
+
+       trap = lock_rename(new_upperdir, old_upperdir);
+
+       olddentry = ovl_dentry_upper(old);
+       newdentry = ovl_dentry_upper(new);
+       if (newdentry) {
+               if (opaquedir) {
+                       newdentry = opaquedir;
+                       opaquedir = NULL;
+               } else {
+                       dget(newdentry);
+               }
+       } else {
+               new_create = true;
+               newdentry = lookup_one_len(new->d_name.name, new_upperdir,
+                                          new->d_name.len);
+               err = PTR_ERR(newdentry);
+               if (IS_ERR(newdentry))
+                       goto out_unlock;
+       }
+
+       err = -ESTALE;
+       if (olddentry->d_parent != old_upperdir)
+               goto out_dput;
+       if (newdentry->d_parent != new_upperdir)
+               goto out_dput;
+       if (olddentry == trap)
+               goto out_dput;
+       if (newdentry == trap)
+               goto out_dput;
+
+       if (is_dir && !old_opaque && new_opaque) {
+               err = ovl_set_opaque(olddentry);
+               if (err)
+                       goto out_dput;
+       }
+       if (!overwrite && new_is_dir && old_opaque && !new_opaque) {
+               err = ovl_set_opaque(newdentry);
+               if (err)
+                       goto out_dput;
+       }
+
+       if (old_opaque || new_opaque) {
+               err = ovl_do_rename(old_upperdir->d_inode, olddentry,
+                                   new_upperdir->d_inode, newdentry,
+                                   flags);
+       } else {
+               /* No debug for the plain case */
+               BUG_ON(flags & ~RENAME_EXCHANGE);
+               err = vfs_rename(old_upperdir->d_inode, olddentry,
+                                new_upperdir->d_inode, newdentry,
+                                NULL, flags);
+       }
+
+       if (err) {
+               if (is_dir && !old_opaque && new_opaque)
+                       ovl_remove_opaque(olddentry);
+               if (!overwrite && new_is_dir && old_opaque && !new_opaque)
+                       ovl_remove_opaque(newdentry);
+               goto out_dput;
+       }
+
+       if (is_dir && old_opaque && !new_opaque)
+               ovl_remove_opaque(olddentry);
+       if (!overwrite && new_is_dir && !old_opaque && new_opaque)
+               ovl_remove_opaque(newdentry);
+
+       if (old_opaque != new_opaque) {
+               ovl_dentry_set_opaque(old, new_opaque);
+               if (!overwrite)
+                       ovl_dentry_set_opaque(new, old_opaque);
+       }
+
+       if (cleanup_whiteout)
+               ovl_cleanup(old_upperdir->d_inode, newdentry);
+
+       ovl_dentry_version_inc(old->d_parent);
+       ovl_dentry_version_inc(new->d_parent);
+
+out_dput:
+       dput(newdentry);
+out_unlock:
+       unlock_rename(new_upperdir, old_upperdir);
+out_revert_creds:
+       if (old_opaque || new_opaque) {
+               revert_creds(old_cred);
+               put_cred(override_cred);
+       }
+out_drop_write:
+       ovl_drop_write(old);
+out:
+       dput(opaquedir);
+       return err;
+}
+
+const struct inode_operations ovl_dir_inode_operations = {
+       .lookup         = ovl_lookup,
+       .mkdir          = ovl_mkdir,
+       .symlink        = ovl_symlink,
+       .unlink         = ovl_unlink,
+       .rmdir          = ovl_rmdir,
+       .rename2        = ovl_rename2,
+       .link           = ovl_link,
+       .setattr        = ovl_setattr,
+       .create         = ovl_create,
+       .mknod          = ovl_mknod,
+       .permission     = ovl_permission,
+       .getattr        = ovl_dir_getattr,
+       .setxattr       = ovl_setxattr,
+       .getxattr       = ovl_getxattr,
+       .listxattr      = ovl_listxattr,
+       .removexattr    = ovl_removexattr,
+};
diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c
new file mode 100644 (file)
index 0000000..af2d18c
--- /dev/null
@@ -0,0 +1,425 @@
+/*
+ *
+ * Copyright (C) 2011 Novell Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/xattr.h>
+#include "overlayfs.h"
+
+static int ovl_copy_up_last(struct dentry *dentry, struct iattr *attr,
+                           bool no_data)
+{
+       int err;
+       struct dentry *parent;
+       struct kstat stat;
+       struct path lowerpath;
+
+       parent = dget_parent(dentry);
+       err = ovl_copy_up(parent);
+       if (err)
+               goto out_dput_parent;
+
+       ovl_path_lower(dentry, &lowerpath);
+       err = vfs_getattr(&lowerpath, &stat);
+       if (err)
+               goto out_dput_parent;
+
+       if (no_data)
+               stat.size = 0;
+
+       err = ovl_copy_up_one(parent, dentry, &lowerpath, &stat, attr);
+
+out_dput_parent:
+       dput(parent);
+       return err;
+}
+
+int ovl_setattr(struct dentry *dentry, struct iattr *attr)
+{
+       int err;
+       struct dentry *upperdentry;
+
+       err = ovl_want_write(dentry);
+       if (err)
+               goto out;
+
+       upperdentry = ovl_dentry_upper(dentry);
+       if (upperdentry) {
+               mutex_lock(&upperdentry->d_inode->i_mutex);
+               err = notify_change(upperdentry, attr, NULL);
+               mutex_unlock(&upperdentry->d_inode->i_mutex);
+       } else {
+               err = ovl_copy_up_last(dentry, attr, false);
+       }
+       ovl_drop_write(dentry);
+out:
+       return err;
+}
+
+static int ovl_getattr(struct vfsmount *mnt, struct dentry *dentry,
+                        struct kstat *stat)
+{
+       struct path realpath;
+
+       ovl_path_real(dentry, &realpath);
+       return vfs_getattr(&realpath, stat);
+}
+
+int ovl_permission(struct inode *inode, int mask)
+{
+       struct ovl_entry *oe;
+       struct dentry *alias = NULL;
+       struct inode *realinode;
+       struct dentry *realdentry;
+       bool is_upper;
+       int err;
+
+       if (S_ISDIR(inode->i_mode)) {
+               oe = inode->i_private;
+       } else if (mask & MAY_NOT_BLOCK) {
+               return -ECHILD;
+       } else {
+               /*
+                * For non-directories find an alias and get the info
+                * from there.
+                */
+               alias = d_find_any_alias(inode);
+               if (WARN_ON(!alias))
+                       return -ENOENT;
+
+               oe = alias->d_fsdata;
+       }
+
+       realdentry = ovl_entry_real(oe, &is_upper);
+
+       /* Careful in RCU walk mode */
+       realinode = ACCESS_ONCE(realdentry->d_inode);
+       if (!realinode) {
+               WARN_ON(!(mask & MAY_NOT_BLOCK));
+               err = -ENOENT;
+               goto out_dput;
+       }
+
+       if (mask & MAY_WRITE) {
+               umode_t mode = realinode->i_mode;
+
+               /*
+                * Writes will always be redirected to upper layer, so
+                * ignore lower layer being read-only.
+                *
+                * If the overlay itself is read-only then proceed
+                * with the permission check, don't return EROFS.
+                * This will only happen if this is the lower layer of
+                * another overlayfs.
+                *
+                * If upper fs becomes read-only after the overlay was
+                * constructed return EROFS to prevent modification of
+                * upper layer.
+                */
+               err = -EROFS;
+               if (is_upper && !IS_RDONLY(inode) && IS_RDONLY(realinode) &&
+                   (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)))
+                       goto out_dput;
+       }
+
+       err = __inode_permission(realinode, mask);
+out_dput:
+       dput(alias);
+       return err;
+}
+
+
+struct ovl_link_data {
+       struct dentry *realdentry;
+       void *cookie;
+};
+
+static void *ovl_follow_link(struct dentry *dentry, struct nameidata *nd)
+{
+       void *ret;
+       struct dentry *realdentry;
+       struct inode *realinode;
+
+       realdentry = ovl_dentry_real(dentry);
+       realinode = realdentry->d_inode;
+
+       if (WARN_ON(!realinode->i_op->follow_link))
+               return ERR_PTR(-EPERM);
+
+       ret = realinode->i_op->follow_link(realdentry, nd);
+       if (IS_ERR(ret))
+               return ret;
+
+       if (realinode->i_op->put_link) {
+               struct ovl_link_data *data;
+
+               data = kmalloc(sizeof(struct ovl_link_data), GFP_KERNEL);
+               if (!data) {
+                       realinode->i_op->put_link(realdentry, nd, ret);
+                       return ERR_PTR(-ENOMEM);
+               }
+               data->realdentry = realdentry;
+               data->cookie = ret;
+
+               return data;
+       } else {
+               return NULL;
+       }
+}
+
+static void ovl_put_link(struct dentry *dentry, struct nameidata *nd, void *c)
+{
+       struct inode *realinode;
+       struct ovl_link_data *data = c;
+
+       if (!data)
+               return;
+
+       realinode = data->realdentry->d_inode;
+       realinode->i_op->put_link(data->realdentry, nd, data->cookie);
+       kfree(data);
+}
+
+static int ovl_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
+{
+       struct path realpath;
+       struct inode *realinode;
+
+       ovl_path_real(dentry, &realpath);
+       realinode = realpath.dentry->d_inode;
+
+       if (!realinode->i_op->readlink)
+               return -EINVAL;
+
+       touch_atime(&realpath);
+
+       return realinode->i_op->readlink(realpath.dentry, buf, bufsiz);
+}
+
+
+static bool ovl_is_private_xattr(const char *name)
+{
+       return strncmp(name, "trusted.overlay.", 14) == 0;
+}
+
+int ovl_setxattr(struct dentry *dentry, const char *name,
+                const void *value, size_t size, int flags)
+{
+       int err;
+       struct dentry *upperdentry;
+
+       err = ovl_want_write(dentry);
+       if (err)
+               goto out;
+
+       err = -EPERM;
+       if (ovl_is_private_xattr(name))
+               goto out_drop_write;
+
+       err = ovl_copy_up(dentry);
+       if (err)
+               goto out_drop_write;
+
+       upperdentry = ovl_dentry_upper(dentry);
+       err = vfs_setxattr(upperdentry, name, value, size, flags);
+
+out_drop_write:
+       ovl_drop_write(dentry);
+out:
+       return err;
+}
+
+ssize_t ovl_getxattr(struct dentry *dentry, const char *name,
+                    void *value, size_t size)
+{
+       if (ovl_path_type(dentry->d_parent) == OVL_PATH_MERGE &&
+           ovl_is_private_xattr(name))
+               return -ENODATA;
+
+       return vfs_getxattr(ovl_dentry_real(dentry), name, value, size);
+}
+
+ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size)
+{
+       ssize_t res;
+       int off;
+
+       res = vfs_listxattr(ovl_dentry_real(dentry), list, size);
+       if (res <= 0 || size == 0)
+               return res;
+
+       if (ovl_path_type(dentry->d_parent) != OVL_PATH_MERGE)
+               return res;
+
+       /* filter out private xattrs */
+       for (off = 0; off < res;) {
+               char *s = list + off;
+               size_t slen = strlen(s) + 1;
+
+               BUG_ON(off + slen > res);
+
+               if (ovl_is_private_xattr(s)) {
+                       res -= slen;
+                       memmove(s, s + slen, res - off);
+               } else {
+                       off += slen;
+               }
+       }
+
+       return res;
+}
+
+int ovl_removexattr(struct dentry *dentry, const char *name)
+{
+       int err;
+       struct path realpath;
+       enum ovl_path_type type;
+
+       err = ovl_want_write(dentry);
+       if (err)
+               goto out;
+
+       if (ovl_path_type(dentry->d_parent) == OVL_PATH_MERGE &&
+           ovl_is_private_xattr(name))
+               goto out_drop_write;
+
+       type = ovl_path_real(dentry, &realpath);
+       if (type == OVL_PATH_LOWER) {
+               err = vfs_getxattr(realpath.dentry, name, NULL, 0);
+               if (err < 0)
+                       goto out_drop_write;
+
+               err = ovl_copy_up(dentry);
+               if (err)
+                       goto out_drop_write;
+
+               ovl_path_upper(dentry, &realpath);
+       }
+
+       err = vfs_removexattr(realpath.dentry, name);
+out_drop_write:
+       ovl_drop_write(dentry);
+out:
+       return err;
+}
+
+static bool ovl_open_need_copy_up(int flags, enum ovl_path_type type,
+                                 struct dentry *realdentry)
+{
+       if (type != OVL_PATH_LOWER)
+               return false;
+
+       if (special_file(realdentry->d_inode->i_mode))
+               return false;
+
+       if (!(OPEN_FMODE(flags) & FMODE_WRITE) && !(flags & O_TRUNC))
+               return false;
+
+       return true;
+}
+
+static int ovl_dentry_open(struct dentry *dentry, struct file *file,
+                   const struct cred *cred)
+{
+       int err;
+       struct path realpath;
+       enum ovl_path_type type;
+       bool want_write = false;
+
+       type = ovl_path_real(dentry, &realpath);
+       if (ovl_open_need_copy_up(file->f_flags, type, realpath.dentry)) {
+               want_write = true;
+               err = ovl_want_write(dentry);
+               if (err)
+                       goto out;
+
+               if (file->f_flags & O_TRUNC)
+                       err = ovl_copy_up_last(dentry, NULL, true);
+               else
+                       err = ovl_copy_up(dentry);
+               if (err)
+                       goto out_drop_write;
+
+               ovl_path_upper(dentry, &realpath);
+       }
+
+       err = vfs_open(&realpath, file, cred);
+out_drop_write:
+       if (want_write)
+               ovl_drop_write(dentry);
+out:
+       return err;
+}
+
+static const struct inode_operations ovl_file_inode_operations = {
+       .setattr        = ovl_setattr,
+       .permission     = ovl_permission,
+       .getattr        = ovl_getattr,
+       .setxattr       = ovl_setxattr,
+       .getxattr       = ovl_getxattr,
+       .listxattr      = ovl_listxattr,
+       .removexattr    = ovl_removexattr,
+       .dentry_open    = ovl_dentry_open,
+};
+
+static const struct inode_operations ovl_symlink_inode_operations = {
+       .setattr        = ovl_setattr,
+       .follow_link    = ovl_follow_link,
+       .put_link       = ovl_put_link,
+       .readlink       = ovl_readlink,
+       .getattr        = ovl_getattr,
+       .setxattr       = ovl_setxattr,
+       .getxattr       = ovl_getxattr,
+       .listxattr      = ovl_listxattr,
+       .removexattr    = ovl_removexattr,
+};
+
+struct inode *ovl_new_inode(struct super_block *sb, umode_t mode,
+                           struct ovl_entry *oe)
+{
+       struct inode *inode;
+
+       inode = new_inode(sb);
+       if (!inode)
+               return NULL;
+
+       mode &= S_IFMT;
+
+       inode->i_ino = get_next_ino();
+       inode->i_mode = mode;
+       inode->i_flags |= S_NOATIME | S_NOCMTIME;
+
+       switch (mode) {
+       case S_IFDIR:
+               inode->i_private = oe;
+               inode->i_op = &ovl_dir_inode_operations;
+               inode->i_fop = &ovl_dir_operations;
+               break;
+
+       case S_IFLNK:
+               inode->i_op = &ovl_symlink_inode_operations;
+               break;
+
+       case S_IFREG:
+       case S_IFSOCK:
+       case S_IFBLK:
+       case S_IFCHR:
+       case S_IFIFO:
+               inode->i_op = &ovl_file_inode_operations;
+               break;
+
+       default:
+               WARN(1, "illegal file type: %i\n", mode);
+               iput(inode);
+               inode = NULL;
+       }
+
+       return inode;
+
+}
diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
new file mode 100644 (file)
index 0000000..814bed3
--- /dev/null
@@ -0,0 +1,191 @@
+/*
+ *
+ * Copyright (C) 2011 Novell Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+
+struct ovl_entry;
+
+enum ovl_path_type {
+       OVL_PATH_PURE_UPPER,
+       OVL_PATH_UPPER,
+       OVL_PATH_MERGE,
+       OVL_PATH_LOWER,
+};
+
+extern const char *ovl_opaque_xattr;
+
+static inline int ovl_do_rmdir(struct inode *dir, struct dentry *dentry)
+{
+       int err = vfs_rmdir(dir, dentry);
+       pr_debug("rmdir(%pd2) = %i\n", dentry, err);
+       return err;
+}
+
+static inline int ovl_do_unlink(struct inode *dir, struct dentry *dentry)
+{
+       int err = vfs_unlink(dir, dentry, NULL);
+       pr_debug("unlink(%pd2) = %i\n", dentry, err);
+       return err;
+}
+
+static inline int ovl_do_link(struct dentry *old_dentry, struct inode *dir,
+                             struct dentry *new_dentry, bool debug)
+{
+       int err = vfs_link(old_dentry, dir, new_dentry, NULL);
+       if (debug) {
+               pr_debug("link(%pd2, %pd2) = %i\n",
+                        old_dentry, new_dentry, err);
+       }
+       return err;
+}
+
+static inline int ovl_do_create(struct inode *dir, struct dentry *dentry,
+                            umode_t mode, bool debug)
+{
+       int err = vfs_create(dir, dentry, mode, true);
+       if (debug)
+               pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err);
+       return err;
+}
+
+static inline int ovl_do_mkdir(struct inode *dir, struct dentry *dentry,
+                              umode_t mode, bool debug)
+{
+       int err = vfs_mkdir(dir, dentry, mode);
+       if (debug)
+               pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, err);
+       return err;
+}
+
+static inline int ovl_do_mknod(struct inode *dir, struct dentry *dentry,
+                              umode_t mode, dev_t dev, bool debug)
+{
+       int err = vfs_mknod(dir, dentry, mode, dev);
+       if (debug) {
+               pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n",
+                        dentry, mode, dev, err);
+       }
+       return err;
+}
+
+static inline int ovl_do_symlink(struct inode *dir, struct dentry *dentry,
+                                const char *oldname, bool debug)
+{
+       int err = vfs_symlink(dir, dentry, oldname);
+       if (debug)
+               pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname, dentry, err);
+       return err;
+}
+
+static inline int ovl_do_setxattr(struct dentry *dentry, const char *name,
+                                 const void *value, size_t size, int flags)
+{
+       int err = vfs_setxattr(dentry, name, value, size, flags);
+       pr_debug("setxattr(%pd2, \"%s\", \"%*s\", 0x%x) = %i\n",
+                dentry, name, (int) size, (char *) value, flags, err);
+       return err;
+}
+
+static inline int ovl_do_removexattr(struct dentry *dentry, const char *name)
+{
+       int err = vfs_removexattr(dentry, name);
+       pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err);
+       return err;
+}
+
+static inline int ovl_do_rename(struct inode *olddir, struct dentry *olddentry,
+                               struct inode *newdir, struct dentry *newdentry,
+                               unsigned int flags)
+{
+       int err;
+
+       pr_debug("rename2(%pd2, %pd2, 0x%x)\n",
+                olddentry, newdentry, flags);
+
+       err = vfs_rename(olddir, olddentry, newdir, newdentry, NULL, flags);
+
+       if (err) {
+               pr_debug("...rename2(%pd2, %pd2, ...) = %i\n",
+                        olddentry, newdentry, err);
+       }
+       return err;
+}
+
+static inline int ovl_do_whiteout(struct inode *dir, struct dentry *dentry)
+{
+       int err = vfs_whiteout(dir, dentry);
+       pr_debug("whiteout(%pd2) = %i\n", dentry, err);
+       return err;
+}
+
+enum ovl_path_type ovl_path_type(struct dentry *dentry);
+u64 ovl_dentry_version_get(struct dentry *dentry);
+void ovl_dentry_version_inc(struct dentry *dentry);
+void ovl_path_upper(struct dentry *dentry, struct path *path);
+void ovl_path_lower(struct dentry *dentry, struct path *path);
+enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path);
+struct dentry *ovl_dentry_upper(struct dentry *dentry);
+struct dentry *ovl_dentry_lower(struct dentry *dentry);
+struct dentry *ovl_dentry_real(struct dentry *dentry);
+struct dentry *ovl_entry_real(struct ovl_entry *oe, bool *is_upper);
+struct ovl_dir_cache *ovl_dir_cache(struct dentry *dentry);
+void ovl_set_dir_cache(struct dentry *dentry, struct ovl_dir_cache *cache);
+struct dentry *ovl_workdir(struct dentry *dentry);
+int ovl_want_write(struct dentry *dentry);
+void ovl_drop_write(struct dentry *dentry);
+bool ovl_dentry_is_opaque(struct dentry *dentry);
+void ovl_dentry_set_opaque(struct dentry *dentry, bool opaque);
+bool ovl_is_whiteout(struct dentry *dentry);
+void ovl_dentry_update(struct dentry *dentry, struct dentry *upperdentry);
+struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry,
+                         unsigned int flags);
+struct file *ovl_path_open(struct path *path, int flags);
+
+struct dentry *ovl_upper_create(struct dentry *upperdir, struct dentry *dentry,
+                               struct kstat *stat, const char *link);
+
+/* readdir.c */
+extern const struct file_operations ovl_dir_operations;
+int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list);
+void ovl_cleanup_whiteouts(struct dentry *upper, struct list_head *list);
+void ovl_cache_free(struct list_head *list);
+
+/* inode.c */
+int ovl_setattr(struct dentry *dentry, struct iattr *attr);
+int ovl_permission(struct inode *inode, int mask);
+int ovl_setxattr(struct dentry *dentry, const char *name,
+                const void *value, size_t size, int flags);
+ssize_t ovl_getxattr(struct dentry *dentry, const char *name,
+                    void *value, size_t size);
+ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size);
+int ovl_removexattr(struct dentry *dentry, const char *name);
+
+struct inode *ovl_new_inode(struct super_block *sb, umode_t mode,
+                           struct ovl_entry *oe);
+static inline void ovl_copyattr(struct inode *from, struct inode *to)
+{
+       to->i_uid = from->i_uid;
+       to->i_gid = from->i_gid;
+}
+
+/* dir.c */
+extern const struct inode_operations ovl_dir_inode_operations;
+struct dentry *ovl_lookup_temp(struct dentry *workdir, struct dentry *dentry);
+int ovl_create_real(struct inode *dir, struct dentry *newdentry,
+                   struct kstat *stat, const char *link,
+                   struct dentry *hardlink, bool debug);
+void ovl_cleanup(struct inode *dir, struct dentry *dentry);
+
+/* copy_up.c */
+int ovl_copy_up(struct dentry *dentry);
+int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry,
+                   struct path *lowerpath, struct kstat *stat,
+                   struct iattr *attr);
+int ovl_copy_xattr(struct dentry *old, struct dentry *new);
+int ovl_set_attr(struct dentry *upper, struct kstat *stat);
diff --git a/fs/overlayfs/readdir.c b/fs/overlayfs/readdir.c
new file mode 100644 (file)
index 0000000..910553f
--- /dev/null
@@ -0,0 +1,590 @@
+/*
+ *
+ * Copyright (C) 2011 Novell Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/namei.h>
+#include <linux/file.h>
+#include <linux/xattr.h>
+#include <linux/rbtree.h>
+#include <linux/security.h>
+#include <linux/cred.h>
+#include "overlayfs.h"
+
+struct ovl_cache_entry {
+       unsigned int len;
+       unsigned int type;
+       u64 ino;
+       bool is_whiteout;
+       struct list_head l_node;
+       struct rb_node node;
+       char name[];
+};
+
+struct ovl_dir_cache {
+       long refcount;
+       u64 version;
+       struct list_head entries;
+};
+
+struct ovl_readdir_data {
+       struct dir_context ctx;
+       bool is_merge;
+       struct rb_root root;
+       struct list_head *list;
+       struct list_head middle;
+       int count;
+       int err;
+};
+
+struct ovl_dir_file {
+       bool is_real;
+       bool is_upper;
+       struct ovl_dir_cache *cache;
+       struct ovl_cache_entry cursor;
+       struct file *realfile;
+       struct file *upperfile;
+};
+
+static struct ovl_cache_entry *ovl_cache_entry_from_node(struct rb_node *n)
+{
+       return container_of(n, struct ovl_cache_entry, node);
+}
+
+static struct ovl_cache_entry *ovl_cache_entry_find(struct rb_root *root,
+                                                   const char *name, int len)
+{
+       struct rb_node *node = root->rb_node;
+       int cmp;
+
+       while (node) {
+               struct ovl_cache_entry *p = ovl_cache_entry_from_node(node);
+
+               cmp = strncmp(name, p->name, len);
+               if (cmp > 0)
+                       node = p->node.rb_right;
+               else if (cmp < 0 || len < p->len)
+                       node = p->node.rb_left;
+               else
+                       return p;
+       }
+
+       return NULL;
+}
+
+static struct ovl_cache_entry *ovl_cache_entry_new(const char *name, int len,
+                                                  u64 ino, unsigned int d_type)
+{
+       struct ovl_cache_entry *p;
+       size_t size = offsetof(struct ovl_cache_entry, name[len + 1]);
+
+       p = kmalloc(size, GFP_KERNEL);
+       if (p) {
+               memcpy(p->name, name, len);
+               p->name[len] = '\0';
+               p->len = len;
+               p->type = d_type;
+               p->ino = ino;
+               p->is_whiteout = false;
+       }
+
+       return p;
+}
+
+static int ovl_cache_entry_add_rb(struct ovl_readdir_data *rdd,
+                                 const char *name, int len, u64 ino,
+                                 unsigned int d_type)
+{
+       struct rb_node **newp = &rdd->root.rb_node;
+       struct rb_node *parent = NULL;
+       struct ovl_cache_entry *p;
+
+       while (*newp) {
+               int cmp;
+               struct ovl_cache_entry *tmp;
+
+               parent = *newp;
+               tmp = ovl_cache_entry_from_node(*newp);
+               cmp = strncmp(name, tmp->name, len);
+               if (cmp > 0)
+                       newp = &tmp->node.rb_right;
+               else if (cmp < 0 || len < tmp->len)
+                       newp = &tmp->node.rb_left;
+               else
+                       return 0;
+       }
+
+       p = ovl_cache_entry_new(name, len, ino, d_type);
+       if (p == NULL)
+               return -ENOMEM;
+
+       list_add_tail(&p->l_node, rdd->list);
+       rb_link_node(&p->node, parent, newp);
+       rb_insert_color(&p->node, &rdd->root);
+
+       return 0;
+}
+
+static int ovl_fill_lower(struct ovl_readdir_data *rdd,
+                         const char *name, int namelen,
+                         loff_t offset, u64 ino, unsigned int d_type)
+{
+       struct ovl_cache_entry *p;
+
+       p = ovl_cache_entry_find(&rdd->root, name, namelen);
+       if (p) {
+               list_move_tail(&p->l_node, &rdd->middle);
+       } else {
+               p = ovl_cache_entry_new(name, namelen, ino, d_type);
+               if (p == NULL)
+                       rdd->err = -ENOMEM;
+               else
+                       list_add_tail(&p->l_node, &rdd->middle);
+       }
+
+       return rdd->err;
+}
+
+void ovl_cache_free(struct list_head *list)
+{
+       struct ovl_cache_entry *p;
+       struct ovl_cache_entry *n;
+
+       list_for_each_entry_safe(p, n, list, l_node)
+               kfree(p);
+
+       INIT_LIST_HEAD(list);
+}
+
+static void ovl_cache_put(struct ovl_dir_file *od, struct dentry *dentry)
+{
+       struct ovl_dir_cache *cache = od->cache;
+
+       list_del(&od->cursor.l_node);
+       WARN_ON(cache->refcount <= 0);
+       cache->refcount--;
+       if (!cache->refcount) {
+               if (ovl_dir_cache(dentry) == cache)
+                       ovl_set_dir_cache(dentry, NULL);
+
+               ovl_cache_free(&cache->entries);
+               kfree(cache);
+       }
+}
+
+static int ovl_fill_merge(void *buf, const char *name, int namelen,
+                         loff_t offset, u64 ino, unsigned int d_type)
+{
+       struct ovl_readdir_data *rdd = buf;
+
+       rdd->count++;
+       if (!rdd->is_merge)
+               return ovl_cache_entry_add_rb(rdd, name, namelen, ino, d_type);
+       else
+               return ovl_fill_lower(rdd, name, namelen, offset, ino, d_type);
+}
+
+static inline int ovl_dir_read(struct path *realpath,
+                              struct ovl_readdir_data *rdd)
+{
+       struct file *realfile;
+       int err;
+
+       realfile = ovl_path_open(realpath, O_RDONLY | O_DIRECTORY);
+       if (IS_ERR(realfile))
+               return PTR_ERR(realfile);
+
+       rdd->ctx.pos = 0;
+       do {
+               rdd->count = 0;
+               rdd->err = 0;
+               err = iterate_dir(realfile, &rdd->ctx);
+               if (err >= 0)
+                       err = rdd->err;
+       } while (!err && rdd->count);
+       fput(realfile);
+
+       return err;
+}
+
+static void ovl_dir_reset(struct file *file)
+{
+       struct ovl_dir_file *od = file->private_data;
+       struct ovl_dir_cache *cache = od->cache;
+       struct dentry *dentry = file->f_path.dentry;
+       enum ovl_path_type type = ovl_path_type(dentry);
+
+       if (cache && ovl_dentry_version_get(dentry) != cache->version) {
+               ovl_cache_put(od, dentry);
+               od->cache = NULL;
+       }
+       WARN_ON(!od->is_real && type != OVL_PATH_MERGE);
+       if (od->is_real && type == OVL_PATH_MERGE)
+               od->is_real = false;
+}
+
+static int ovl_dir_mark_whiteouts(struct dentry *dir,
+                                 struct ovl_readdir_data *rdd)
+{
+       struct ovl_cache_entry *p;
+       struct dentry *dentry;
+       const struct cred *old_cred;
+       struct cred *override_cred;
+
+       override_cred = prepare_creds();
+       if (!override_cred) {
+               ovl_cache_free(rdd->list);
+               return -ENOMEM;
+       }
+
+       /*
+        * CAP_DAC_OVERRIDE for lookup
+        */
+       cap_raise(override_cred->cap_effective, CAP_DAC_OVERRIDE);
+       old_cred = override_creds(override_cred);
+
+       mutex_lock(&dir->d_inode->i_mutex);
+       list_for_each_entry(p, rdd->list, l_node) {
+               if (!p->name)
+                       continue;
+
+               if (p->type != DT_CHR)
+                       continue;
+
+               dentry = lookup_one_len(p->name, dir, p->len);
+               if (IS_ERR(dentry))
+                       continue;
+
+               p->is_whiteout = ovl_is_whiteout(dentry);
+               dput(dentry);
+       }
+       mutex_unlock(&dir->d_inode->i_mutex);
+
+       revert_creds(old_cred);
+       put_cred(override_cred);
+
+       return 0;
+}
+
+static inline int ovl_dir_read_merged(struct path *upperpath,
+                                     struct path *lowerpath,
+                                     struct list_head *list)
+{
+       int err;
+       struct ovl_readdir_data rdd = {
+               .ctx.actor = ovl_fill_merge,
+               .list = list,
+               .root = RB_ROOT,
+               .is_merge = false,
+       };
+
+       if (upperpath->dentry) {
+               err = ovl_dir_read(upperpath, &rdd);
+               if (err)
+                       goto out;
+
+               if (lowerpath->dentry) {
+                       err = ovl_dir_mark_whiteouts(upperpath->dentry, &rdd);
+                       if (err)
+                               goto out;
+               }
+       }
+       if (lowerpath->dentry) {
+               /*
+                * Insert lowerpath entries before upperpath ones, this allows
+                * offsets to be reasonably constant
+                */
+               list_add(&rdd.middle, rdd.list);
+               rdd.is_merge = true;
+               err = ovl_dir_read(lowerpath, &rdd);
+               list_del(&rdd.middle);
+       }
+out:
+       return err;
+
+}
+
+static void ovl_seek_cursor(struct ovl_dir_file *od, loff_t pos)
+{
+       struct ovl_cache_entry *p;
+       loff_t off = 0;
+
+       list_for_each_entry(p, &od->cache->entries, l_node) {
+               if (!p->name)
+                       continue;
+               if (off >= pos)
+                       break;
+               off++;
+       }
+       list_move_tail(&od->cursor.l_node, &p->l_node);
+}
+
+static struct ovl_dir_cache *ovl_cache_get(struct dentry *dentry)
+{
+       int res;
+       struct path lowerpath;
+       struct path upperpath;
+       struct ovl_dir_cache *cache;
+
+       cache = ovl_dir_cache(dentry);
+       if (cache && ovl_dentry_version_get(dentry) == cache->version) {
+               cache->refcount++;
+               return cache;
+       }
+       ovl_set_dir_cache(dentry, NULL);
+
+       cache = kzalloc(sizeof(struct ovl_dir_cache), GFP_KERNEL);
+       if (!cache)
+               return ERR_PTR(-ENOMEM);
+
+       cache->refcount = 1;
+       INIT_LIST_HEAD(&cache->entries);
+
+       ovl_path_lower(dentry, &lowerpath);
+       ovl_path_upper(dentry, &upperpath);
+
+       res = ovl_dir_read_merged(&upperpath, &lowerpath, &cache->entries);
+       if (res) {
+               ovl_cache_free(&cache->entries);
+               kfree(cache);
+               return ERR_PTR(res);
+       }
+
+       cache->version = ovl_dentry_version_get(dentry);
+       ovl_set_dir_cache(dentry, cache);
+
+       return cache;
+}
+
+static int ovl_iterate(struct file *file, struct dir_context *ctx)
+{
+       struct ovl_dir_file *od = file->private_data;
+       struct dentry *dentry = file->f_path.dentry;
+
+       if (!ctx->pos)
+               ovl_dir_reset(file);
+
+       if (od->is_real)
+               return iterate_dir(od->realfile, ctx);
+
+       if (!od->cache) {
+               struct ovl_dir_cache *cache;
+
+               cache = ovl_cache_get(dentry);
+               if (IS_ERR(cache))
+                       return PTR_ERR(cache);
+
+               od->cache = cache;
+               ovl_seek_cursor(od, ctx->pos);
+       }
+
+       while (od->cursor.l_node.next != &od->cache->entries) {
+               struct ovl_cache_entry *p;
+
+               p = list_entry(od->cursor.l_node.next, struct ovl_cache_entry, l_node);
+               /* Skip cursors */
+               if (p->name) {
+                       if (!p->is_whiteout) {
+                               if (!dir_emit(ctx, p->name, p->len, p->ino, p->type))
+                                       break;
+                       }
+                       ctx->pos++;
+               }
+               list_move(&od->cursor.l_node, &p->l_node);
+       }
+       return 0;
+}
+
+static loff_t ovl_dir_llseek(struct file *file, loff_t offset, int origin)
+{
+       loff_t res;
+       struct ovl_dir_file *od = file->private_data;
+
+       mutex_lock(&file_inode(file)->i_mutex);
+       if (!file->f_pos)
+               ovl_dir_reset(file);
+
+       if (od->is_real) {
+               res = vfs_llseek(od->realfile, offset, origin);
+               file->f_pos = od->realfile->f_pos;
+       } else {
+               res = -EINVAL;
+
+               switch (origin) {
+               case SEEK_CUR:
+                       offset += file->f_pos;
+                       break;
+               case SEEK_SET:
+                       break;
+               default:
+                       goto out_unlock;
+               }
+               if (offset < 0)
+                       goto out_unlock;
+
+               if (offset != file->f_pos) {
+                       file->f_pos = offset;
+                       if (od->cache)
+                               ovl_seek_cursor(od, offset);
+               }
+               res = offset;
+       }
+out_unlock:
+       mutex_unlock(&file_inode(file)->i_mutex);
+
+       return res;
+}
+
+static int ovl_dir_fsync(struct file *file, loff_t start, loff_t end,
+                        int datasync)
+{
+       struct ovl_dir_file *od = file->private_data;
+       struct dentry *dentry = file->f_path.dentry;
+       struct file *realfile = od->realfile;
+
+       /*
+        * Need to check if we started out being a lower dir, but got copied up
+        */
+       if (!od->is_upper && ovl_path_type(dentry) == OVL_PATH_MERGE) {
+               struct inode *inode = file_inode(file);
+
+               realfile = od->upperfile;
+               if (!realfile) {
+                       struct path upperpath;
+
+                       ovl_path_upper(dentry, &upperpath);
+                       realfile = ovl_path_open(&upperpath, O_RDONLY);
+                       mutex_lock(&inode->i_mutex);
+                       if (!od->upperfile) {
+                               if (IS_ERR(realfile)) {
+                                       mutex_unlock(&inode->i_mutex);
+                                       return PTR_ERR(realfile);
+                               }
+                               od->upperfile = realfile;
+                       } else {
+                               /* somebody has beaten us to it */
+                               if (!IS_ERR(realfile))
+                                       fput(realfile);
+                               realfile = od->upperfile;
+                       }
+                       mutex_unlock(&inode->i_mutex);
+               }
+       }
+
+       return vfs_fsync_range(realfile, start, end, datasync);
+}
+
+static int ovl_dir_release(struct inode *inode, struct file *file)
+{
+       struct ovl_dir_file *od = file->private_data;
+
+       if (od->cache) {
+               mutex_lock(&inode->i_mutex);
+               ovl_cache_put(od, file->f_path.dentry);
+               mutex_unlock(&inode->i_mutex);
+       }
+       fput(od->realfile);
+       if (od->upperfile)
+               fput(od->upperfile);
+       kfree(od);
+
+       return 0;
+}
+
+static int ovl_dir_open(struct inode *inode, struct file *file)
+{
+       struct path realpath;
+       struct file *realfile;
+       struct ovl_dir_file *od;
+       enum ovl_path_type type;
+
+       od = kzalloc(sizeof(struct ovl_dir_file), GFP_KERNEL);
+       if (!od)
+               return -ENOMEM;
+
+       type = ovl_path_real(file->f_path.dentry, &realpath);
+       realfile = ovl_path_open(&realpath, file->f_flags);
+       if (IS_ERR(realfile)) {
+               kfree(od);
+               return PTR_ERR(realfile);
+       }
+       INIT_LIST_HEAD(&od->cursor.l_node);
+       od->realfile = realfile;
+       od->is_real = (type != OVL_PATH_MERGE);
+       od->is_upper = (type != OVL_PATH_LOWER);
+       file->private_data = od;
+
+       return 0;
+}
+
+const struct file_operations ovl_dir_operations = {
+       .read           = generic_read_dir,
+       .open           = ovl_dir_open,
+       .iterate        = ovl_iterate,
+       .llseek         = ovl_dir_llseek,
+       .fsync          = ovl_dir_fsync,
+       .release        = ovl_dir_release,
+};
+
+int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list)
+{
+       int err;
+       struct path lowerpath;
+       struct path upperpath;
+       struct ovl_cache_entry *p;
+
+       ovl_path_upper(dentry, &upperpath);
+       ovl_path_lower(dentry, &lowerpath);
+
+       err = ovl_dir_read_merged(&upperpath, &lowerpath, list);
+       if (err)
+               return err;
+
+       err = 0;
+
+       list_for_each_entry(p, list, l_node) {
+               if (p->is_whiteout)
+                       continue;
+
+               if (p->name[0] == '.') {
+                       if (p->len == 1)
+                               continue;
+                       if (p->len == 2 && p->name[1] == '.')
+                               continue;
+               }
+               err = -ENOTEMPTY;
+               break;
+       }
+
+       return err;
+}
+
+void ovl_cleanup_whiteouts(struct dentry *upper, struct list_head *list)
+{
+       struct ovl_cache_entry *p;
+
+       mutex_lock_nested(&upper->d_inode->i_mutex, I_MUTEX_PARENT);
+       list_for_each_entry(p, list, l_node) {
+               struct dentry *dentry;
+
+               if (!p->is_whiteout)
+                       continue;
+
+               dentry = lookup_one_len(p->name, upper, p->len);
+               if (IS_ERR(dentry)) {
+                       pr_err("overlayfs: lookup '%s/%.*s' failed (%i)\n",
+                              upper->d_name.name, p->len, p->name,
+                              (int) PTR_ERR(dentry));
+                       continue;
+               }
+               ovl_cleanup(upper->d_inode, dentry);
+               dput(dentry);
+       }
+       mutex_unlock(&upper->d_inode->i_mutex);
+}
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
new file mode 100644 (file)
index 0000000..08b704c
--- /dev/null
@@ -0,0 +1,796 @@
+/*
+ *
+ * Copyright (C) 2011 Novell Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+#include <linux/fs.h>
+#include <linux/namei.h>
+#include <linux/xattr.h>
+#include <linux/security.h>
+#include <linux/mount.h>
+#include <linux/slab.h>
+#include <linux/parser.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/statfs.h>
+#include <linux/seq_file.h>
+#include "overlayfs.h"
+
+MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>");
+MODULE_DESCRIPTION("Overlay filesystem");
+MODULE_LICENSE("GPL");
+
+#define OVERLAYFS_SUPER_MAGIC 0x794c764f
+
+struct ovl_config {
+       char *lowerdir;
+       char *upperdir;
+       char *workdir;
+};
+
+/* private information held for overlayfs's superblock */
+struct ovl_fs {
+       struct vfsmount *upper_mnt;
+       struct vfsmount *lower_mnt;
+       struct dentry *workdir;
+       long lower_namelen;
+       /* pathnames of lower and upper dirs, for show_options */
+       struct ovl_config config;
+};
+
+struct ovl_dir_cache;
+
+/* private information held for every overlayfs dentry */
+struct ovl_entry {
+       struct dentry *__upperdentry;
+       struct dentry *lowerdentry;
+       struct ovl_dir_cache *cache;
+       union {
+               struct {
+                       u64 version;
+                       bool opaque;
+               };
+               struct rcu_head rcu;
+       };
+};
+
+const char *ovl_opaque_xattr = "trusted.overlay.opaque";
+
+
+enum ovl_path_type ovl_path_type(struct dentry *dentry)
+{
+       struct ovl_entry *oe = dentry->d_fsdata;
+
+       if (oe->__upperdentry) {
+               if (oe->lowerdentry) {
+                       if (S_ISDIR(dentry->d_inode->i_mode))
+                               return OVL_PATH_MERGE;
+                       else
+                               return OVL_PATH_UPPER;
+               } else {
+                       if (oe->opaque)
+                               return OVL_PATH_UPPER;
+                       else
+                               return OVL_PATH_PURE_UPPER;
+               }
+       } else {
+               return OVL_PATH_LOWER;
+       }
+}
+
+static struct dentry *ovl_upperdentry_dereference(struct ovl_entry *oe)
+{
+       struct dentry *upperdentry = ACCESS_ONCE(oe->__upperdentry);
+       /*
+        * Make sure to order reads to upperdentry wrt ovl_dentry_update()
+        */
+       smp_read_barrier_depends();
+       return upperdentry;
+}
+
+void ovl_path_upper(struct dentry *dentry, struct path *path)
+{
+       struct ovl_fs *ofs = dentry->d_sb->s_fs_info;
+       struct ovl_entry *oe = dentry->d_fsdata;
+
+       path->mnt = ofs->upper_mnt;
+       path->dentry = ovl_upperdentry_dereference(oe);
+}
+
+enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path)
+{
+
+       enum ovl_path_type type = ovl_path_type(dentry);
+
+       if (type == OVL_PATH_LOWER)
+               ovl_path_lower(dentry, path);
+       else
+               ovl_path_upper(dentry, path);
+
+       return type;
+}
+
+struct dentry *ovl_dentry_upper(struct dentry *dentry)
+{
+       struct ovl_entry *oe = dentry->d_fsdata;
+
+       return ovl_upperdentry_dereference(oe);
+}
+
+struct dentry *ovl_dentry_lower(struct dentry *dentry)
+{
+       struct ovl_entry *oe = dentry->d_fsdata;
+
+       return oe->lowerdentry;
+}
+
+struct dentry *ovl_dentry_real(struct dentry *dentry)
+{
+       struct ovl_entry *oe = dentry->d_fsdata;
+       struct dentry *realdentry;
+
+       realdentry = ovl_upperdentry_dereference(oe);
+       if (!realdentry)
+               realdentry = oe->lowerdentry;
+
+       return realdentry;
+}
+
+struct dentry *ovl_entry_real(struct ovl_entry *oe, bool *is_upper)
+{
+       struct dentry *realdentry;
+
+       realdentry = ovl_upperdentry_dereference(oe);
+       if (realdentry) {
+               *is_upper = true;
+       } else {
+               realdentry = oe->lowerdentry;
+               *is_upper = false;
+       }
+       return realdentry;
+}
+
+struct ovl_dir_cache *ovl_dir_cache(struct dentry *dentry)
+{
+       struct ovl_entry *oe = dentry->d_fsdata;
+
+       return oe->cache;
+}
+
+void ovl_set_dir_cache(struct dentry *dentry, struct ovl_dir_cache *cache)
+{
+       struct ovl_entry *oe = dentry->d_fsdata;
+
+       oe->cache = cache;
+}
+
+void ovl_path_lower(struct dentry *dentry, struct path *path)
+{
+       struct ovl_fs *ofs = dentry->d_sb->s_fs_info;
+       struct ovl_entry *oe = dentry->d_fsdata;
+
+       path->mnt = ofs->lower_mnt;
+       path->dentry = oe->lowerdentry;
+}
+
+int ovl_want_write(struct dentry *dentry)
+{
+       struct ovl_fs *ofs = dentry->d_sb->s_fs_info;
+       return mnt_want_write(ofs->upper_mnt);
+}
+
+void ovl_drop_write(struct dentry *dentry)
+{
+       struct ovl_fs *ofs = dentry->d_sb->s_fs_info;
+       mnt_drop_write(ofs->upper_mnt);
+}
+
+struct dentry *ovl_workdir(struct dentry *dentry)
+{
+       struct ovl_fs *ofs = dentry->d_sb->s_fs_info;
+       return ofs->workdir;
+}
+
+bool ovl_dentry_is_opaque(struct dentry *dentry)
+{
+       struct ovl_entry *oe = dentry->d_fsdata;
+       return oe->opaque;
+}
+
+void ovl_dentry_set_opaque(struct dentry *dentry, bool opaque)
+{
+       struct ovl_entry *oe = dentry->d_fsdata;
+       oe->opaque = opaque;
+}
+
+void ovl_dentry_update(struct dentry *dentry, struct dentry *upperdentry)
+{
+       struct ovl_entry *oe = dentry->d_fsdata;
+
+       WARN_ON(!mutex_is_locked(&upperdentry->d_parent->d_inode->i_mutex));
+       WARN_ON(oe->__upperdentry);
+       BUG_ON(!upperdentry->d_inode);
+       /*
+        * Make sure upperdentry is consistent before making it visible to
+        * ovl_upperdentry_dereference().
+        */
+       smp_wmb();
+       oe->__upperdentry = upperdentry;
+}
+
+void ovl_dentry_version_inc(struct dentry *dentry)
+{
+       struct ovl_entry *oe = dentry->d_fsdata;
+
+       WARN_ON(!mutex_is_locked(&dentry->d_inode->i_mutex));
+       oe->version++;
+}
+
+u64 ovl_dentry_version_get(struct dentry *dentry)
+{
+       struct ovl_entry *oe = dentry->d_fsdata;
+
+       WARN_ON(!mutex_is_locked(&dentry->d_inode->i_mutex));
+       return oe->version;
+}
+
+bool ovl_is_whiteout(struct dentry *dentry)
+{
+       struct inode *inode = dentry->d_inode;
+
+       return inode && IS_WHITEOUT(inode);
+}
+
+static bool ovl_is_opaquedir(struct dentry *dentry)
+{
+       int res;
+       char val;
+       struct inode *inode = dentry->d_inode;
+
+       if (!S_ISDIR(inode->i_mode) || !inode->i_op->getxattr)
+               return false;
+
+       res = inode->i_op->getxattr(dentry, ovl_opaque_xattr, &val, 1);
+       if (res == 1 && val == 'y')
+               return true;
+
+       return false;
+}
+
+static void ovl_dentry_release(struct dentry *dentry)
+{
+       struct ovl_entry *oe = dentry->d_fsdata;
+
+       if (oe) {
+               dput(oe->__upperdentry);
+               dput(oe->lowerdentry);
+               kfree_rcu(oe, rcu);
+       }
+}
+
+static const struct dentry_operations ovl_dentry_operations = {
+       .d_release = ovl_dentry_release,
+};
+
+static struct ovl_entry *ovl_alloc_entry(void)
+{
+       return kzalloc(sizeof(struct ovl_entry), GFP_KERNEL);
+}
+
+static inline struct dentry *ovl_lookup_real(struct dentry *dir,
+                                            struct qstr *name)
+{
+       struct dentry *dentry;
+
+       mutex_lock(&dir->d_inode->i_mutex);
+       dentry = lookup_one_len(name->name, dir, name->len);
+       mutex_unlock(&dir->d_inode->i_mutex);
+
+       if (IS_ERR(dentry)) {
+               if (PTR_ERR(dentry) == -ENOENT)
+                       dentry = NULL;
+       } else if (!dentry->d_inode) {
+               dput(dentry);
+               dentry = NULL;
+       }
+       return dentry;
+}
+
+struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry,
+                         unsigned int flags)
+{
+       struct ovl_entry *oe;
+       struct dentry *upperdir;
+       struct dentry *lowerdir;
+       struct dentry *upperdentry = NULL;
+       struct dentry *lowerdentry = NULL;
+       struct inode *inode = NULL;
+       int err;
+
+       err = -ENOMEM;
+       oe = ovl_alloc_entry();
+       if (!oe)
+               goto out;
+
+       upperdir = ovl_dentry_upper(dentry->d_parent);
+       lowerdir = ovl_dentry_lower(dentry->d_parent);
+
+       if (upperdir) {
+               upperdentry = ovl_lookup_real(upperdir, &dentry->d_name);
+               err = PTR_ERR(upperdentry);
+               if (IS_ERR(upperdentry))
+                       goto out_put_dir;
+
+               if (lowerdir && upperdentry) {
+                       if (ovl_is_whiteout(upperdentry)) {
+                               dput(upperdentry);
+                               upperdentry = NULL;
+                               oe->opaque = true;
+                       } else if (ovl_is_opaquedir(upperdentry)) {
+                               oe->opaque = true;
+                       }
+               }
+       }
+       if (lowerdir && !oe->opaque) {
+               lowerdentry = ovl_lookup_real(lowerdir, &dentry->d_name);
+               err = PTR_ERR(lowerdentry);
+               if (IS_ERR(lowerdentry))
+                       goto out_dput_upper;
+       }
+
+       if (lowerdentry && upperdentry &&
+           (!S_ISDIR(upperdentry->d_inode->i_mode) ||
+            !S_ISDIR(lowerdentry->d_inode->i_mode))) {
+               dput(lowerdentry);
+               lowerdentry = NULL;
+               oe->opaque = true;
+       }
+
+       if (lowerdentry || upperdentry) {
+               struct dentry *realdentry;
+
+               realdentry = upperdentry ? upperdentry : lowerdentry;
+               err = -ENOMEM;
+               inode = ovl_new_inode(dentry->d_sb, realdentry->d_inode->i_mode,
+                                     oe);
+               if (!inode)
+                       goto out_dput;
+               ovl_copyattr(realdentry->d_inode, inode);
+       }
+
+       oe->__upperdentry = upperdentry;
+       oe->lowerdentry = lowerdentry;
+
+       dentry->d_fsdata = oe;
+       d_add(dentry, inode);
+
+       return NULL;
+
+out_dput:
+       dput(lowerdentry);
+out_dput_upper:
+       dput(upperdentry);
+out_put_dir:
+       kfree(oe);
+out:
+       return ERR_PTR(err);
+}
+
+struct file *ovl_path_open(struct path *path, int flags)
+{
+       return dentry_open(path, flags, current_cred());
+}
+
+static void ovl_put_super(struct super_block *sb)
+{
+       struct ovl_fs *ufs = sb->s_fs_info;
+
+       dput(ufs->workdir);
+       mntput(ufs->upper_mnt);
+       mntput(ufs->lower_mnt);
+
+       kfree(ufs->config.lowerdir);
+       kfree(ufs->config.upperdir);
+       kfree(ufs->config.workdir);
+       kfree(ufs);
+}
+
+/**
+ * ovl_statfs
+ * @sb: The overlayfs super block
+ * @buf: The struct kstatfs to fill in with stats
+ *
+ * Get the filesystem statistics.  As writes always target the upper layer
+ * filesystem pass the statfs to the same filesystem.
+ */
+static int ovl_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+       struct ovl_fs *ofs = dentry->d_sb->s_fs_info;
+       struct dentry *root_dentry = dentry->d_sb->s_root;
+       struct path path;
+       int err;
+
+       ovl_path_upper(root_dentry, &path);
+
+       err = vfs_statfs(&path, buf);
+       if (!err) {
+               buf->f_namelen = max(buf->f_namelen, ofs->lower_namelen);
+               buf->f_type = OVERLAYFS_SUPER_MAGIC;
+       }
+
+       return err;
+}
+
+/**
+ * ovl_show_options
+ *
+ * Prints the mount options for a given superblock.
+ * Returns zero; does not fail.
+ */
+static int ovl_show_options(struct seq_file *m, struct dentry *dentry)
+{
+       struct super_block *sb = dentry->d_sb;
+       struct ovl_fs *ufs = sb->s_fs_info;
+
+       seq_printf(m, ",lowerdir=%s", ufs->config.lowerdir);
+       seq_printf(m, ",upperdir=%s", ufs->config.upperdir);
+       seq_printf(m, ",workdir=%s", ufs->config.workdir);
+       return 0;
+}
+
+static const struct super_operations ovl_super_operations = {
+       .put_super      = ovl_put_super,
+       .statfs         = ovl_statfs,
+       .show_options   = ovl_show_options,
+};
+
+enum {
+       OPT_LOWERDIR,
+       OPT_UPPERDIR,
+       OPT_WORKDIR,
+       OPT_ERR,
+};
+
+static const match_table_t ovl_tokens = {
+       {OPT_LOWERDIR,                  "lowerdir=%s"},
+       {OPT_UPPERDIR,                  "upperdir=%s"},
+       {OPT_WORKDIR,                   "workdir=%s"},
+       {OPT_ERR,                       NULL}
+};
+
+static int ovl_parse_opt(char *opt, struct ovl_config *config)
+{
+       char *p;
+
+       while ((p = strsep(&opt, ",")) != NULL) {
+               int token;
+               substring_t args[MAX_OPT_ARGS];
+
+               if (!*p)
+                       continue;
+
+               token = match_token(p, ovl_tokens, args);
+               switch (token) {
+               case OPT_UPPERDIR:
+                       kfree(config->upperdir);
+                       config->upperdir = match_strdup(&args[0]);
+                       if (!config->upperdir)
+                               return -ENOMEM;
+                       break;
+
+               case OPT_LOWERDIR:
+                       kfree(config->lowerdir);
+                       config->lowerdir = match_strdup(&args[0]);
+                       if (!config->lowerdir)
+                               return -ENOMEM;
+                       break;
+
+               case OPT_WORKDIR:
+                       kfree(config->workdir);
+                       config->workdir = match_strdup(&args[0]);
+                       if (!config->workdir)
+                               return -ENOMEM;
+                       break;
+
+               default:
+                       return -EINVAL;
+               }
+       }
+       return 0;
+}
+
+#define OVL_WORKDIR_NAME "work"
+
+static struct dentry *ovl_workdir_create(struct vfsmount *mnt,
+                                        struct dentry *dentry)
+{
+       struct inode *dir = dentry->d_inode;
+       struct dentry *work;
+       int err;
+       bool retried = false;
+
+       err = mnt_want_write(mnt);
+       if (err)
+               return ERR_PTR(err);
+
+       mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT);
+retry:
+       work = lookup_one_len(OVL_WORKDIR_NAME, dentry,
+                             strlen(OVL_WORKDIR_NAME));
+
+       if (!IS_ERR(work)) {
+               struct kstat stat = {
+                       .mode = S_IFDIR | 0,
+               };
+
+               if (work->d_inode) {
+                       err = -EEXIST;
+                       if (retried)
+                               goto out_dput;
+
+                       retried = true;
+                       ovl_cleanup(dir, work);
+                       dput(work);
+                       goto retry;
+               }
+
+               err = ovl_create_real(dir, work, &stat, NULL, NULL, true);
+               if (err)
+                       goto out_dput;
+       }
+out_unlock:
+       mutex_unlock(&dir->i_mutex);
+       mnt_drop_write(mnt);
+
+       return work;
+
+out_dput:
+       dput(work);
+       work = ERR_PTR(err);
+       goto out_unlock;
+}
+
+static int ovl_mount_dir(const char *name, struct path *path)
+{
+       int err;
+
+       err = kern_path(name, LOOKUP_FOLLOW, path);
+       if (err) {
+               pr_err("overlayfs: failed to resolve '%s': %i\n", name, err);
+               err = -EINVAL;
+       }
+       return err;
+}
+
+static bool ovl_is_allowed_fs_type(struct dentry *root)
+{
+       const struct dentry_operations *dop = root->d_op;
+
+       /*
+        * We don't support:
+        *  - automount filesystems
+        *  - filesystems with revalidate (FIXME for lower layer)
+        *  - filesystems with case insensitive names
+        */
+       if (dop &&
+           (dop->d_manage || dop->d_automount ||
+            dop->d_revalidate || dop->d_weak_revalidate ||
+            dop->d_compare || dop->d_hash)) {
+               return false;
+       }
+       return true;
+}
+
+/* Workdir should not be subdir of upperdir and vice versa */
+static bool ovl_workdir_ok(struct dentry *workdir, struct dentry *upperdir)
+{
+       bool ok = false;
+
+       if (workdir != upperdir) {
+               ok = (lock_rename(workdir, upperdir) == NULL);
+               unlock_rename(workdir, upperdir);
+       }
+       return ok;
+}
+
+static int ovl_fill_super(struct super_block *sb, void *data, int silent)
+{
+       struct path lowerpath;
+       struct path upperpath;
+       struct path workpath;
+       struct inode *root_inode;
+       struct dentry *root_dentry;
+       struct ovl_entry *oe;
+       struct ovl_fs *ufs;
+       struct kstatfs statfs;
+       int err;
+
+       err = -ENOMEM;
+       ufs = kzalloc(sizeof(struct ovl_fs), GFP_KERNEL);
+       if (!ufs)
+               goto out;
+
+       err = ovl_parse_opt((char *) data, &ufs->config);
+       if (err)
+               goto out_free_config;
+
+       /* FIXME: workdir is not needed for a R/O mount */
+       err = -EINVAL;
+       if (!ufs->config.upperdir || !ufs->config.lowerdir ||
+           !ufs->config.workdir) {
+               pr_err("overlayfs: missing upperdir or lowerdir or workdir\n");
+               goto out_free_config;
+       }
+
+       err = -ENOMEM;
+       oe = ovl_alloc_entry();
+       if (oe == NULL)
+               goto out_free_config;
+
+       err = ovl_mount_dir(ufs->config.upperdir, &upperpath);
+       if (err)
+               goto out_free_oe;
+
+       err = ovl_mount_dir(ufs->config.lowerdir, &lowerpath);
+       if (err)
+               goto out_put_upperpath;
+
+       err = ovl_mount_dir(ufs->config.workdir, &workpath);
+       if (err)
+               goto out_put_lowerpath;
+
+       err = -EINVAL;
+       if (!S_ISDIR(upperpath.dentry->d_inode->i_mode) ||
+           !S_ISDIR(lowerpath.dentry->d_inode->i_mode) ||
+           !S_ISDIR(workpath.dentry->d_inode->i_mode)) {
+               pr_err("overlayfs: upperdir or lowerdir or workdir not a directory\n");
+               goto out_put_workpath;
+       }
+
+       if (upperpath.mnt != workpath.mnt) {
+               pr_err("overlayfs: workdir and upperdir must reside under the same mount\n");
+               goto out_put_workpath;
+       }
+       if (!ovl_workdir_ok(workpath.dentry, upperpath.dentry)) {
+               pr_err("overlayfs: workdir and upperdir must be separate subtrees\n");
+               goto out_put_workpath;
+       }
+
+       if (!ovl_is_allowed_fs_type(upperpath.dentry)) {
+               pr_err("overlayfs: filesystem of upperdir is not supported\n");
+               goto out_put_workpath;
+       }
+
+       if (!ovl_is_allowed_fs_type(lowerpath.dentry)) {
+               pr_err("overlayfs: filesystem of lowerdir is not supported\n");
+               goto out_put_workpath;
+       }
+
+       err = vfs_statfs(&lowerpath, &statfs);
+       if (err) {
+               pr_err("overlayfs: statfs failed on lowerpath\n");
+               goto out_put_workpath;
+       }
+       ufs->lower_namelen = statfs.f_namelen;
+
+       sb->s_stack_depth = max(upperpath.mnt->mnt_sb->s_stack_depth,
+                               lowerpath.mnt->mnt_sb->s_stack_depth) + 1;
+
+       err = -EINVAL;
+       if (sb->s_stack_depth > FILESYSTEM_MAX_STACK_DEPTH) {
+               pr_err("overlayfs: maximum fs stacking depth exceeded\n");
+               goto out_put_workpath;
+       }
+
+       ufs->upper_mnt = clone_private_mount(&upperpath);
+       err = PTR_ERR(ufs->upper_mnt);
+       if (IS_ERR(ufs->upper_mnt)) {
+               pr_err("overlayfs: failed to clone upperpath\n");
+               goto out_put_workpath;
+       }
+
+       ufs->lower_mnt = clone_private_mount(&lowerpath);
+       err = PTR_ERR(ufs->lower_mnt);
+       if (IS_ERR(ufs->lower_mnt)) {
+               pr_err("overlayfs: failed to clone lowerpath\n");
+               goto out_put_upper_mnt;
+       }
+
+       ufs->workdir = ovl_workdir_create(ufs->upper_mnt, workpath.dentry);
+       err = PTR_ERR(ufs->workdir);
+       if (IS_ERR(ufs->workdir)) {
+               pr_err("overlayfs: failed to create directory %s/%s\n",
+                      ufs->config.workdir, OVL_WORKDIR_NAME);
+               goto out_put_lower_mnt;
+       }
+
+       /*
+        * Make lower_mnt R/O.  That way fchmod/fchown on lower file
+        * will fail instead of modifying lower fs.
+        */
+       ufs->lower_mnt->mnt_flags |= MNT_READONLY;
+
+       /* If the upper fs is r/o, we mark overlayfs r/o too */
+       if (ufs->upper_mnt->mnt_sb->s_flags & MS_RDONLY)
+               sb->s_flags |= MS_RDONLY;
+
+       sb->s_d_op = &ovl_dentry_operations;
+
+       err = -ENOMEM;
+       root_inode = ovl_new_inode(sb, S_IFDIR, oe);
+       if (!root_inode)
+               goto out_put_workdir;
+
+       root_dentry = d_make_root(root_inode);
+       if (!root_dentry)
+               goto out_put_workdir;
+
+       mntput(upperpath.mnt);
+       mntput(lowerpath.mnt);
+       path_put(&workpath);
+
+       oe->__upperdentry = upperpath.dentry;
+       oe->lowerdentry = lowerpath.dentry;
+
+       root_dentry->d_fsdata = oe;
+
+       sb->s_magic = OVERLAYFS_SUPER_MAGIC;
+       sb->s_op = &ovl_super_operations;
+       sb->s_root = root_dentry;
+       sb->s_fs_info = ufs;
+
+       return 0;
+
+out_put_workdir:
+       dput(ufs->workdir);
+out_put_lower_mnt:
+       mntput(ufs->lower_mnt);
+out_put_upper_mnt:
+       mntput(ufs->upper_mnt);
+out_put_workpath:
+       path_put(&workpath);
+out_put_lowerpath:
+       path_put(&lowerpath);
+out_put_upperpath:
+       path_put(&upperpath);
+out_free_oe:
+       kfree(oe);
+out_free_config:
+       kfree(ufs->config.lowerdir);
+       kfree(ufs->config.upperdir);
+       kfree(ufs->config.workdir);
+       kfree(ufs);
+out:
+       return err;
+}
+
+static struct dentry *ovl_mount(struct file_system_type *fs_type, int flags,
+                               const char *dev_name, void *raw_data)
+{
+       return mount_nodev(fs_type, flags, raw_data, ovl_fill_super);
+}
+
+static struct file_system_type ovl_fs_type = {
+       .owner          = THIS_MODULE,
+       .name           = "overlayfs",
+       .mount          = ovl_mount,
+       .kill_sb        = kill_anon_super,
+};
+MODULE_ALIAS_FS("overlayfs");
+
+static int __init ovl_init(void)
+{
+       return register_filesystem(&ovl_fs_type);
+}
+
+static void __exit ovl_exit(void)
+{
+       unregister_filesystem(&ovl_fs_type);
+}
+
+module_init(ovl_init);
+module_exit(ovl_exit);
index f5cb9ba84510fe5632a62af0bbf3843a45eeba23..75c6058eabf2e37b27df85fafe6e6b2b5b9379dd 100644 (file)
@@ -1330,6 +1330,7 @@ long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
 
        return ret;
 }
+EXPORT_SYMBOL(do_splice_direct);
 
 static int splice_pipe_to_pipe(struct pipe_inode_info *ipipe,
                               struct pipe_inode_info *opipe,
index a957d4366c240fbf80d6470f3808316dd8def6b2..4e41a4a331bbf96c4b59c05cd9a0c522efec92ca 100644 (file)
@@ -222,6 +222,13 @@ typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
 #define ATTR_OPEN      (1 << 15) /* Truncating from open(O_TRUNC) */
 #define ATTR_TIMES_SET (1 << 16)
 
+/*
+ * Whiteout is represented by a char device.  The following constants define the
+ * mode and device number to use.
+ */
+#define WHITEOUT_MODE 0
+#define WHITEOUT_DEV 0
+
 /*
  * This is the Inode Attributes structure, used for notify_change().  It
  * uses the above definitions as flags, to know which values have changed.
@@ -254,6 +261,12 @@ struct iattr {
  */
 #include <linux/quota.h>
 
+/*
+ * Maximum number of layers of fs stack.  Needs to be limited to
+ * prevent kernel stack overflow
+ */
+#define FILESYSTEM_MAX_STACK_DEPTH 2
+
 /** 
  * enum positive_aop_returns - aop return codes with specific semantics
  *
@@ -1266,6 +1279,11 @@ struct super_block {
        struct list_lru         s_dentry_lru ____cacheline_aligned_in_smp;
        struct list_lru         s_inode_lru ____cacheline_aligned_in_smp;
        struct rcu_head         rcu;
+
+       /*
+        * Indicates how deep in a filesystem stack this SB is
+        */
+       int s_stack_depth;
 };
 
 extern struct timespec current_fs_time(struct super_block *sb);
@@ -1398,6 +1416,7 @@ extern int vfs_link(struct dentry *, struct inode *, struct dentry *, struct ino
 extern int vfs_rmdir(struct inode *, struct dentry *);
 extern int vfs_unlink(struct inode *, struct dentry *, struct inode **);
 extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *, struct inode **, unsigned int);
+extern int vfs_whiteout(struct inode *, struct dentry *);
 
 /*
  * VFS dentry helper functions.
@@ -1528,6 +1547,9 @@ struct inode_operations {
                           umode_t create_mode, int *opened);
        int (*tmpfile) (struct inode *, struct dentry *, umode_t);
        int (*set_acl)(struct inode *, struct posix_acl *, int);
+
+       /* WARNING: probably going away soon, do not use! */
+       int (*dentry_open)(struct dentry *, struct file *, const struct cred *);
 } ____cacheline_aligned;
 
 ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
@@ -1625,6 +1647,9 @@ struct super_operations {
 #define IS_AUTOMOUNT(inode)    ((inode)->i_flags & S_AUTOMOUNT)
 #define IS_NOSEC(inode)                ((inode)->i_flags & S_NOSEC)
 
+#define IS_WHITEOUT(inode)     (S_ISCHR(inode->i_mode) && \
+                                (inode)->i_rdev == WHITEOUT_DEV)
+
 /*
  * Inode state bits.  Protected by inode->i_lock
  *
@@ -2040,6 +2065,7 @@ extern struct file *file_open_name(struct filename *, int, umode_t);
 extern struct file *filp_open(const char *, int, umode_t);
 extern struct file *file_open_root(struct dentry *, struct vfsmount *,
                                   const char *, int);
+extern int vfs_open(const struct path *, struct file *, const struct cred *);
 extern struct file * dentry_open(const struct path *, int, const struct cred *);
 extern int filp_close(struct file *, fl_owner_t id);
 
@@ -2253,7 +2279,9 @@ extern sector_t bmap(struct inode *, sector_t);
 #endif
 extern int notify_change(struct dentry *, struct iattr *, struct inode **);
 extern int inode_permission(struct inode *, int);
+extern int __inode_permission(struct inode *, int);
 extern int generic_permission(struct inode *, int);
+extern int __check_sticky(struct inode *dir, struct inode *inode);
 
 static inline bool execute_ok(struct inode *inode)
 {
@@ -2452,6 +2480,9 @@ extern ssize_t iter_file_splice_write(struct pipe_inode_info *,
                struct file *, loff_t *, size_t, unsigned int);
 extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe,
                struct file *out, loff_t *, size_t len, unsigned int flags);
+extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
+               loff_t *opos, size_t len, unsigned int flags);
+
 
 extern void
 file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
@@ -2737,6 +2768,14 @@ static inline int is_sxid(umode_t mode)
        return (mode & S_ISUID) || ((mode & S_ISGID) && (mode & S_IXGRP));
 }
 
+static inline int check_sticky(struct inode *dir, struct inode *inode)
+{
+       if (!(dir->i_mode & S_ISVTX))
+               return 0;
+
+       return __check_sticky(dir, inode);
+}
+
 static inline void inode_has_no_xattr(struct inode *inode)
 {
        if (!is_sxid(inode->i_mode) && (inode->i_sb->s_flags & MS_NOSEC))
index 9262e4bf0cc3408588adc819abc7ea9be69b88dd..c2c561dc011440ee83f395aba0a226ab467204a0 100644 (file)
@@ -81,6 +81,9 @@ extern struct vfsmount *mntget(struct vfsmount *mnt);
 extern struct vfsmount *mnt_clone_internal(struct path *path);
 extern int __mnt_is_readonly(struct vfsmount *mnt);
 
+struct path;
+extern struct vfsmount *clone_private_mount(struct path *path);
+
 struct file_system_type;
 extern struct vfsmount *vfs_kern_mount(struct file_system_type *type,
                                      int flags, const char *name,
index ca1a11bb4443a7f09c3e4b9228c48a346eadce1c..3735fa0a67840ba1882fd42b343c01550a540944 100644 (file)
@@ -37,6 +37,7 @@
 
 #define RENAME_NOREPLACE       (1 << 0)        /* Don't overwrite target */
 #define RENAME_EXCHANGE                (1 << 1)        /* Exchange source and dest */
+#define RENAME_WHITEOUT                (1 << 2)        /* Whiteout source */
 
 struct fstrim_range {
        __u64 start;
index cd6fc7590e54f758adacdcfc9cdcb402c7cd3005..185836ba53ef6e23a63b6a0de7c22ebae19eac0b 100644 (file)
@@ -2345,6 +2345,32 @@ static int shmem_exchange(struct inode *old_dir, struct dentry *old_dentry, stru
        return 0;
 }
 
+static int shmem_whiteout(struct inode *old_dir, struct dentry *old_dentry)
+{
+       struct dentry *whiteout;
+       int error;
+
+       whiteout = d_alloc(old_dentry->d_parent, &old_dentry->d_name);
+       if (!whiteout)
+               return -ENOMEM;
+
+       error = shmem_mknod(old_dir, whiteout,
+                           S_IFCHR | WHITEOUT_MODE, WHITEOUT_DEV);
+       dput(whiteout);
+       if (error)
+               return error;
+
+       /*
+        * Cheat and hash the whiteout while the old dentry is still in
+        * place, instead of playing games with FS_RENAME_DOES_D_MOVE.
+        *
+        * d_lookup() will consistently find one of them at this point,
+        * not sure which one, but that isn't even important.
+        */
+       d_rehash(whiteout);
+       return 0;
+}
+
 /*
  * The VFS layer already does all the dentry stuff for rename,
  * we just have to decrement the usage count for the target if
@@ -2356,7 +2382,7 @@ static int shmem_rename2(struct inode *old_dir, struct dentry *old_dentry, struc
        struct inode *inode = old_dentry->d_inode;
        int they_are_dirs = S_ISDIR(inode->i_mode);
 
-       if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE))
+       if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
                return -EINVAL;
 
        if (flags & RENAME_EXCHANGE)
@@ -2365,6 +2391,14 @@ static int shmem_rename2(struct inode *old_dir, struct dentry *old_dentry, struc
        if (!simple_empty(new_dentry))
                return -ENOTEMPTY;
 
+       if (flags & RENAME_WHITEOUT) {
+               int error;
+
+               error = shmem_whiteout(old_dir, old_dentry);
+               if (error)
+                       return error;
+       }
+
        if (new_dentry->d_inode) {
                (void) shmem_unlink(new_dir, new_dentry);
                if (they_are_dirs) {