Merge branch 'semaphore' of git://git.kernel.org/pub/scm/linux/kernel/git/willy/misc

[sfrench/cifs-2.6.git] / include / linux / fs.h

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 18cfbf76ec5be8f1f20ddb2fad22f7cd6101596c..0c609e71c3790cdd09ddce6ae51aa61d0d0f5e9a 100644 (file)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -287,9 +287,9 @@ extern int dir_notify_enable;
 #include <linux/pid.h>
 #include <linux/mutex.h>
 #include <linux/capability.h>
+#include <linux/semaphore.h>
 
 #include <asm/atomic.h>
-#include <asm/semaphore.h>
 #include <asm/byteorder.h>
 
 struct export_operations;
@@ -776,6 +776,9 @@ static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index)
                index <  ra->start + ra->size);
 }
 
+#define FILE_MNT_WRITE_TAKEN   1
+#define FILE_MNT_WRITE_RELEASED        2
+
 struct file {
        /*
         * fu_list becomes invalid after file_free is called and queued via
@@ -810,6 +813,9 @@ struct file {
        spinlock_t              f_ep_lock;
 #endif /* #ifdef CONFIG_EPOLL */
        struct address_space    *f_mapping;
+#ifdef CONFIG_DEBUG_WRITECOUNT
+       unsigned long f_mnt_write_state;
+#endif
 };
 extern spinlock_t files_lock;
 #define file_list_lock() spin_lock(&files_lock);
@@ -818,6 +824,49 @@ extern spinlock_t files_lock;
 #define get_file(x)    atomic_inc(&(x)->f_count)
 #define file_count(x)  atomic_read(&(x)->f_count)
 
+#ifdef CONFIG_DEBUG_WRITECOUNT
+static inline void file_take_write(struct file *f)
+{
+       WARN_ON(f->f_mnt_write_state != 0);
+       f->f_mnt_write_state = FILE_MNT_WRITE_TAKEN;
+}
+static inline void file_release_write(struct file *f)
+{
+       f->f_mnt_write_state |= FILE_MNT_WRITE_RELEASED;
+}
+static inline void file_reset_write(struct file *f)
+{
+       f->f_mnt_write_state = 0;
+}
+static inline void file_check_state(struct file *f)
+{
+       /*
+        * At this point, either both or neither of these bits
+        * should be set.
+        */
+       WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN);
+       WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_RELEASED);
+}
+static inline int file_check_writeable(struct file *f)
+{
+       if (f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN)
+               return 0;
+       printk(KERN_WARNING "writeable file with no "
+                           "mnt_want_write()\n");
+       WARN_ON(1);
+       return -EINVAL;
+}
+#else /* !CONFIG_DEBUG_WRITECOUNT */
+static inline void file_take_write(struct file *filp) {}
+static inline void file_release_write(struct file *filp) {}
+static inline void file_reset_write(struct file *filp) {}
+static inline void file_check_state(struct file *filp) {}
+static inline int file_check_writeable(struct file *filp)
+{
+       return 0;
+}
+#endif /* CONFIG_DEBUG_WRITECOUNT */
+
 #define        MAX_NON_LFS     ((1UL<<31) - 1)
 
 /* Page cache limit. The filesystems should put that into their s_maxbytes 
@@ -1284,8 +1333,10 @@ struct super_operations {
  *
  * I_DIRTY_SYNC                Inode is dirty, but doesn't have to be written on
  *                     fdatasync().  i_atime is the usual cause.
- * I_DIRTY_DATASYNC    Inode is dirty and must be written on fdatasync(), f.e.
- *                     because i_size changed.
+ * I_DIRTY_DATASYNC    Data-related inode changes pending. We keep track of
+ *                     these changes separately from I_DIRTY_SYNC so that we
+ *                     don't have to write inode on fdatasync() when only
+ *                     mtime has changed in it.
  * I_DIRTY_PAGES       Inode has dirty pages.  Inode itself may be clean.
  * I_NEW               get_new_inode() sets i_state to I_LOCK|I_NEW.  Both
  *                     are cleared by unlock_new_inode(), called from iget().
@@ -1588,7 +1639,6 @@ extern void bd_set_size(struct block_device *, loff_t size);
 extern void bd_forget(struct inode *inode);
 extern void bdput(struct block_device *);
 extern struct block_device *open_by_devnum(dev_t, unsigned);
-extern const struct address_space_operations def_blk_aops;
 #else
 static inline void bd_forget(struct inode *inode) {}
 #endif
@@ -1734,7 +1784,8 @@ extern struct file *create_read_pipe(struct file *f);
 extern struct file *create_write_pipe(void);
 extern void free_write_pipe(struct file *);
 
-extern int open_namei(int dfd, const char *, int, int, struct nameidata *);
+extern struct file *do_filp_open(int dfd, const char *pathname,
+               int open_flag, int mode);
 extern int may_open(struct nameidata *, int, int);
 
 extern int kernel_read(struct file *, unsigned long, char *, unsigned long);