#include <linux/delay.h>
#include <linux/mount.h>
#include <linux/slab.h>
+#include <linux/swap.h>
#include <asm/div64.h>
#include "cifsfs.h"
#include "cifspdu.h"
int rc;
int desiredAccess;
int disposition;
+ int create_options = CREATE_NOT_DIR;
FILE_ALL_INFO *buf;
desiredAccess = cifs_convert_flags(f_flags);
if (!buf)
return -ENOMEM;
+ if (backup_cred(cifs_sb))
+ create_options |= CREATE_OPEN_BACKUP_INTENT;
+
if (tcon->ses->capabilities & CAP_NT_SMBS)
rc = CIFSSMBOpen(xid, tcon, full_path, disposition,
- desiredAccess, CREATE_NOT_DIR, pnetfid, poplock, buf,
+ desiredAccess, create_options, pnetfid, poplock, buf,
cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
& CIFS_MOUNT_MAP_SPECIAL_CHR);
else
pCifsFile->invalidHandle = false;
pCifsFile->tlink = cifs_get_tlink(tlink);
mutex_init(&pCifsFile->fh_mutex);
- mutex_init(&pCifsFile->lock_mutex);
- INIT_LIST_HEAD(&pCifsFile->llist);
INIT_WORK(&pCifsFile->oplock_break, cifs_oplock_break);
spin_lock(&cifs_file_list_lock);
spin_unlock(&cifs_file_list_lock);
cifs_set_oplock_level(pCifsInode, oplock);
+ pCifsInode->can_cache_brlcks = pCifsInode->clientCanCacheAll;
file->private_data = pCifsFile;
return pCifsFile;
}
+static void cifs_del_lock_waiters(struct cifsLockInfo *lock);
+
/*
* Release a reference on the file private data. This may involve closing
* the filehandle out on the server. Must be called without holding
/* Delete any outstanding lock records. We'll lose them when the file
* is closed anyway.
*/
- mutex_lock(&cifs_file->lock_mutex);
- list_for_each_entry_safe(li, tmp, &cifs_file->llist, llist) {
+ mutex_lock(&cifsi->lock_mutex);
+ list_for_each_entry_safe(li, tmp, &cifsi->llist, llist) {
+ if (li->netfid != cifs_file->netfid)
+ continue;
list_del(&li->llist);
+ cifs_del_lock_waiters(li);
kfree(li);
}
- mutex_unlock(&cifs_file->lock_mutex);
+ mutex_unlock(&cifsi->lock_mutex);
cifs_put_tlink(cifs_file->tlink);
dput(cifs_file->dentry);
cFYI(1, "inode = 0x%p file flags are 0x%x for %s",
inode, file->f_flags, full_path);
- if (oplockEnabled)
+ if (enable_oplocks)
oplock = REQ_OPLOCK;
else
oplock = 0;
char *full_path = NULL;
int desiredAccess;
int disposition = FILE_OPEN;
+ int create_options = CREATE_NOT_DIR;
__u16 netfid;
xid = GetXid();
cFYI(1, "inode = 0x%p file flags 0x%x for %s",
inode, pCifsFile->f_flags, full_path);
- if (oplockEnabled)
+ if (enable_oplocks)
oplock = REQ_OPLOCK;
else
oplock = 0;
desiredAccess = cifs_convert_flags(pCifsFile->f_flags);
+ if (backup_cred(cifs_sb))
+ create_options |= CREATE_OPEN_BACKUP_INTENT;
+
/* Can not refresh inode by passing in file_info buf to be returned
by SMBOpen and then calling get_inode_info with returned buf
since file might have write behind data that needs to be flushed
that inode was not dirty locally we could do this */
rc = CIFSSMBOpen(xid, tcon, full_path, disposition, desiredAccess,
- CREATE_NOT_DIR, &netfid, &oplock, NULL,
+ create_options, &netfid, &oplock, NULL,
cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
CIFS_MOUNT_MAP_SPECIAL_CHR);
if (rc) {
return rc;
}
-static int store_file_lock(struct cifsFileInfo *fid, __u64 len,
- __u64 offset, __u8 lockType)
+static struct cifsLockInfo *
+cifs_lock_init(__u64 len, __u64 offset, __u8 type, __u16 netfid)
{
struct cifsLockInfo *li =
kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL);
- if (li == NULL)
- return -ENOMEM;
+ if (!li)
+ return li;
+ li->netfid = netfid;
li->offset = offset;
li->length = len;
- li->type = lockType;
- mutex_lock(&fid->lock_mutex);
- list_add(&li->llist, &fid->llist);
- mutex_unlock(&fid->lock_mutex);
+ li->type = type;
+ li->pid = current->tgid;
+ INIT_LIST_HEAD(&li->blist);
+ init_waitqueue_head(&li->block_q);
+ return li;
+}
+
+static void
+cifs_del_lock_waiters(struct cifsLockInfo *lock)
+{
+ struct cifsLockInfo *li, *tmp;
+ list_for_each_entry_safe(li, tmp, &lock->blist, blist) {
+ list_del_init(&li->blist);
+ wake_up(&li->block_q);
+ }
+}
+
+static bool
+cifs_find_lock_conflict(struct cifsInodeInfo *cinode, __u64 offset,
+ __u64 length, __u8 type, __u16 netfid,
+ struct cifsLockInfo **conf_lock)
+{
+ struct cifsLockInfo *li, *tmp;
+
+ list_for_each_entry_safe(li, tmp, &cinode->llist, llist) {
+ if (offset + length <= li->offset ||
+ offset >= li->offset + li->length)
+ continue;
+ else if ((type & LOCKING_ANDX_SHARED_LOCK) &&
+ ((netfid == li->netfid && current->tgid == li->pid) ||
+ type == li->type))
+ continue;
+ else {
+ *conf_lock = li;
+ return true;
+ }
+ }
+ return false;
+}
+
+static int
+cifs_lock_test(struct cifsInodeInfo *cinode, __u64 offset, __u64 length,
+ __u8 type, __u16 netfid, struct file_lock *flock)
+{
+ int rc = 0;
+ struct cifsLockInfo *conf_lock;
+ bool exist;
+
+ mutex_lock(&cinode->lock_mutex);
+
+ exist = cifs_find_lock_conflict(cinode, offset, length, type, netfid,
+ &conf_lock);
+ if (exist) {
+ flock->fl_start = conf_lock->offset;
+ flock->fl_end = conf_lock->offset + conf_lock->length - 1;
+ flock->fl_pid = conf_lock->pid;
+ if (conf_lock->type & LOCKING_ANDX_SHARED_LOCK)
+ flock->fl_type = F_RDLCK;
+ else
+ flock->fl_type = F_WRLCK;
+ } else if (!cinode->can_cache_brlcks)
+ rc = 1;
+ else
+ flock->fl_type = F_UNLCK;
+
+ mutex_unlock(&cinode->lock_mutex);
+ return rc;
+}
+
+static int
+cifs_lock_add(struct cifsInodeInfo *cinode, __u64 len, __u64 offset,
+ __u8 type, __u16 netfid)
+{
+ struct cifsLockInfo *li;
+
+ li = cifs_lock_init(len, offset, type, netfid);
+ if (!li)
+ return -ENOMEM;
+
+ mutex_lock(&cinode->lock_mutex);
+ list_add_tail(&li->llist, &cinode->llist);
+ mutex_unlock(&cinode->lock_mutex);
return 0;
}
-int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
+static int
+cifs_lock_add_if(struct cifsInodeInfo *cinode, __u64 offset, __u64 length,
+ __u8 type, __u16 netfid, bool wait)
{
- int rc, xid;
- __u32 numLock = 0;
- __u32 numUnlock = 0;
- __u64 length;
- bool wait_flag = false;
- struct cifs_sb_info *cifs_sb;
+ struct cifsLockInfo *lock, *conf_lock;
+ bool exist;
+ int rc = 0;
+
+ lock = cifs_lock_init(length, offset, type, netfid);
+ if (!lock)
+ return -ENOMEM;
+
+try_again:
+ exist = false;
+ mutex_lock(&cinode->lock_mutex);
+
+ exist = cifs_find_lock_conflict(cinode, offset, length, type, netfid,
+ &conf_lock);
+ if (!exist && cinode->can_cache_brlcks) {
+ list_add_tail(&lock->llist, &cinode->llist);
+ mutex_unlock(&cinode->lock_mutex);
+ return rc;
+ }
+
+ if (!exist)
+ rc = 1;
+ else if (!wait)
+ rc = -EACCES;
+ else {
+ list_add_tail(&lock->blist, &conf_lock->blist);
+ mutex_unlock(&cinode->lock_mutex);
+ rc = wait_event_interruptible(lock->block_q,
+ (lock->blist.prev == &lock->blist) &&
+ (lock->blist.next == &lock->blist));
+ if (!rc)
+ goto try_again;
+ else {
+ mutex_lock(&cinode->lock_mutex);
+ list_del_init(&lock->blist);
+ }
+ }
+
+ kfree(lock);
+ mutex_unlock(&cinode->lock_mutex);
+ return rc;
+}
+
+static int
+cifs_posix_lock_test(struct file *file, struct file_lock *flock)
+{
+ int rc = 0;
+ struct cifsInodeInfo *cinode = CIFS_I(file->f_path.dentry->d_inode);
+ unsigned char saved_type = flock->fl_type;
+
+ mutex_lock(&cinode->lock_mutex);
+ posix_test_lock(file, flock);
+
+ if (flock->fl_type == F_UNLCK && !cinode->can_cache_brlcks) {
+ flock->fl_type = saved_type;
+ rc = 1;
+ }
+
+ mutex_unlock(&cinode->lock_mutex);
+ return rc;
+}
+
+static int
+cifs_posix_lock_set(struct file *file, struct file_lock *flock)
+{
+ struct cifsInodeInfo *cinode = CIFS_I(file->f_path.dentry->d_inode);
+ int rc;
+
+ mutex_lock(&cinode->lock_mutex);
+ if (!cinode->can_cache_brlcks) {
+ mutex_unlock(&cinode->lock_mutex);
+ return 1;
+ }
+ rc = posix_lock_file_wait(file, flock);
+ mutex_unlock(&cinode->lock_mutex);
+ return rc;
+}
+
+static int
+cifs_push_mandatory_locks(struct cifsFileInfo *cfile)
+{
+ int xid, rc = 0, stored_rc;
+ struct cifsLockInfo *li, *tmp;
struct cifs_tcon *tcon;
- __u16 netfid;
- __u8 lockType = LOCKING_ANDX_LARGE_FILES;
- bool posix_locking = 0;
+ struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
+ unsigned int num, max_num;
+ LOCKING_ANDX_RANGE *buf, *cur;
+ int types[] = {LOCKING_ANDX_LARGE_FILES,
+ LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES};
+ int i;
+
+ xid = GetXid();
+ tcon = tlink_tcon(cfile->tlink);
+
+ mutex_lock(&cinode->lock_mutex);
+ if (!cinode->can_cache_brlcks) {
+ mutex_unlock(&cinode->lock_mutex);
+ FreeXid(xid);
+ return rc;
+ }
+
+ max_num = (tcon->ses->server->maxBuf - sizeof(struct smb_hdr)) /
+ sizeof(LOCKING_ANDX_RANGE);
+ buf = kzalloc(max_num * sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL);
+ if (!buf) {
+ mutex_unlock(&cinode->lock_mutex);
+ FreeXid(xid);
+ return rc;
+ }
+
+ for (i = 0; i < 2; i++) {
+ cur = buf;
+ num = 0;
+ list_for_each_entry_safe(li, tmp, &cinode->llist, llist) {
+ if (li->type != types[i])
+ continue;
+ cur->Pid = cpu_to_le16(li->pid);
+ cur->LengthLow = cpu_to_le32((u32)li->length);
+ cur->LengthHigh = cpu_to_le32((u32)(li->length>>32));
+ cur->OffsetLow = cpu_to_le32((u32)li->offset);
+ cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32));
+ if (++num == max_num) {
+ stored_rc = cifs_lockv(xid, tcon, cfile->netfid,
+ li->type, 0, num, buf);
+ if (stored_rc)
+ rc = stored_rc;
+ cur = buf;
+ num = 0;
+ } else
+ cur++;
+ }
+
+ if (num) {
+ stored_rc = cifs_lockv(xid, tcon, cfile->netfid,
+ types[i], 0, num, buf);
+ if (stored_rc)
+ rc = stored_rc;
+ }
+ }
+
+ cinode->can_cache_brlcks = false;
+ mutex_unlock(&cinode->lock_mutex);
+
+ kfree(buf);
+ FreeXid(xid);
+ return rc;
+}
+
+/* copied from fs/locks.c with a name change */
+#define cifs_for_each_lock(inode, lockp) \
+ for (lockp = &inode->i_flock; *lockp != NULL; \
+ lockp = &(*lockp)->fl_next)
+
+static int
+cifs_push_posix_locks(struct cifsFileInfo *cfile)
+{
+ struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
+ struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
+ struct file_lock *flock, **before;
+ struct cifsLockInfo *lck, *tmp;
+ int rc = 0, xid, type;
+ __u64 length;
+ struct list_head locks_to_send;
- length = 1 + pfLock->fl_end - pfLock->fl_start;
- rc = -EACCES;
xid = GetXid();
- cFYI(1, "Lock parm: 0x%x flockflags: "
- "0x%x flocktype: 0x%x start: %lld end: %lld",
- cmd, pfLock->fl_flags, pfLock->fl_type, pfLock->fl_start,
- pfLock->fl_end);
+ mutex_lock(&cinode->lock_mutex);
+ if (!cinode->can_cache_brlcks) {
+ mutex_unlock(&cinode->lock_mutex);
+ FreeXid(xid);
+ return rc;
+ }
+
+ INIT_LIST_HEAD(&locks_to_send);
- if (pfLock->fl_flags & FL_POSIX)
+ lock_flocks();
+ cifs_for_each_lock(cfile->dentry->d_inode, before) {
+ flock = *before;
+ length = 1 + flock->fl_end - flock->fl_start;
+ if (flock->fl_type == F_RDLCK || flock->fl_type == F_SHLCK)
+ type = CIFS_RDLCK;
+ else
+ type = CIFS_WRLCK;
+
+ lck = cifs_lock_init(length, flock->fl_start, type,
+ cfile->netfid);
+ if (!lck) {
+ rc = -ENOMEM;
+ goto send_locks;
+ }
+ lck->pid = flock->fl_pid;
+
+ list_add_tail(&lck->llist, &locks_to_send);
+ }
+
+send_locks:
+ unlock_flocks();
+
+ list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) {
+ struct file_lock tmp_lock;
+ int stored_rc;
+
+ tmp_lock.fl_start = lck->offset;
+ stored_rc = CIFSSMBPosixLock(xid, tcon, lck->netfid, lck->pid,
+ 0, lck->length, &tmp_lock,
+ lck->type, 0);
+ if (stored_rc)
+ rc = stored_rc;
+ list_del(&lck->llist);
+ kfree(lck);
+ }
+
+ cinode->can_cache_brlcks = false;
+ mutex_unlock(&cinode->lock_mutex);
+
+ FreeXid(xid);
+ return rc;
+}
+
+static int
+cifs_push_locks(struct cifsFileInfo *cfile)
+{
+ struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb);
+ struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
+
+ if ((tcon->ses->capabilities & CAP_UNIX) &&
+ (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
+ ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
+ return cifs_push_posix_locks(cfile);
+
+ return cifs_push_mandatory_locks(cfile);
+}
+
+static void
+cifs_read_flock(struct file_lock *flock, __u8 *type, int *lock, int *unlock,
+ bool *wait_flag)
+{
+ if (flock->fl_flags & FL_POSIX)
cFYI(1, "Posix");
- if (pfLock->fl_flags & FL_FLOCK)
+ if (flock->fl_flags & FL_FLOCK)
cFYI(1, "Flock");
- if (pfLock->fl_flags & FL_SLEEP) {
+ if (flock->fl_flags & FL_SLEEP) {
cFYI(1, "Blocking lock");
- wait_flag = true;
+ *wait_flag = true;
}
- if (pfLock->fl_flags & FL_ACCESS)
+ if (flock->fl_flags & FL_ACCESS)
cFYI(1, "Process suspended by mandatory locking - "
- "not implemented yet");
- if (pfLock->fl_flags & FL_LEASE)
+ "not implemented yet");
+ if (flock->fl_flags & FL_LEASE)
cFYI(1, "Lease on file - not implemented yet");
- if (pfLock->fl_flags &
+ if (flock->fl_flags &
(~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE)))
- cFYI(1, "Unknown lock flags 0x%x", pfLock->fl_flags);
+ cFYI(1, "Unknown lock flags 0x%x", flock->fl_flags);
- if (pfLock->fl_type == F_WRLCK) {
+ *type = LOCKING_ANDX_LARGE_FILES;
+ if (flock->fl_type == F_WRLCK) {
cFYI(1, "F_WRLCK ");
- numLock = 1;
- } else if (pfLock->fl_type == F_UNLCK) {
+ *lock = 1;
+ } else if (flock->fl_type == F_UNLCK) {
cFYI(1, "F_UNLCK");
- numUnlock = 1;
- /* Check if unlock includes more than
- one lock range */
- } else if (pfLock->fl_type == F_RDLCK) {
+ *unlock = 1;
+ /* Check if unlock includes more than one lock range */
+ } else if (flock->fl_type == F_RDLCK) {
cFYI(1, "F_RDLCK");
- lockType |= LOCKING_ANDX_SHARED_LOCK;
- numLock = 1;
- } else if (pfLock->fl_type == F_EXLCK) {
+ *type |= LOCKING_ANDX_SHARED_LOCK;
+ *lock = 1;
+ } else if (flock->fl_type == F_EXLCK) {
cFYI(1, "F_EXLCK");
- numLock = 1;
- } else if (pfLock->fl_type == F_SHLCK) {
+ *lock = 1;
+ } else if (flock->fl_type == F_SHLCK) {
cFYI(1, "F_SHLCK");
- lockType |= LOCKING_ANDX_SHARED_LOCK;
- numLock = 1;
+ *type |= LOCKING_ANDX_SHARED_LOCK;
+ *lock = 1;
} else
cFYI(1, "Unknown type of lock");
+}
- cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
- tcon = tlink_tcon(((struct cifsFileInfo *)file->private_data)->tlink);
- netfid = ((struct cifsFileInfo *)file->private_data)->netfid;
+static int
+cifs_getlk(struct file *file, struct file_lock *flock, __u8 type,
+ bool wait_flag, bool posix_lck, int xid)
+{
+ int rc = 0;
+ __u64 length = 1 + flock->fl_end - flock->fl_start;
+ struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data;
+ struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
+ struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
+ __u16 netfid = cfile->netfid;
- if ((tcon->ses->capabilities & CAP_UNIX) &&
- (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
- ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
- posix_locking = 1;
- /* BB add code here to normalize offset and length to
- account for negative length which we can not accept over the
- wire */
- if (IS_GETLK(cmd)) {
- if (posix_locking) {
- int posix_lock_type;
- if (lockType & LOCKING_ANDX_SHARED_LOCK)
- posix_lock_type = CIFS_RDLCK;
- else
- posix_lock_type = CIFS_WRLCK;
- rc = CIFSSMBPosixLock(xid, tcon, netfid, 1 /* get */,
- length, pfLock, posix_lock_type,
- wait_flag);
- FreeXid(xid);
+ if (posix_lck) {
+ int posix_lock_type;
+
+ rc = cifs_posix_lock_test(file, flock);
+ if (!rc)
return rc;
- }
- /* BB we could chain these into one lock request BB */
- rc = CIFSSMBLock(xid, tcon, netfid, length, pfLock->fl_start,
- 0, 1, lockType, 0 /* wait flag */, 0);
- if (rc == 0) {
- rc = CIFSSMBLock(xid, tcon, netfid, length,
- pfLock->fl_start, 1 /* numUnlock */ ,
- 0 /* numLock */ , lockType,
- 0 /* wait flag */, 0);
- pfLock->fl_type = F_UNLCK;
- if (rc != 0)
- cERROR(1, "Error unlocking previously locked "
- "range %d during test of lock", rc);
- rc = 0;
+ if (type & LOCKING_ANDX_SHARED_LOCK)
+ posix_lock_type = CIFS_RDLCK;
+ else
+ posix_lock_type = CIFS_WRLCK;
+ rc = CIFSSMBPosixLock(xid, tcon, netfid, current->tgid,
+ 1 /* get */, length, flock,
+ posix_lock_type, wait_flag);
+ return rc;
+ }
- } else {
- /* if rc == ERR_SHARING_VIOLATION ? */
- rc = 0;
+ rc = cifs_lock_test(cinode, flock->fl_start, length, type, netfid,
+ flock);
+ if (!rc)
+ return rc;
- if (lockType & LOCKING_ANDX_SHARED_LOCK) {
- pfLock->fl_type = F_WRLCK;
- } else {
- rc = CIFSSMBLock(xid, tcon, netfid, length,
- pfLock->fl_start, 0, 1,
- lockType | LOCKING_ANDX_SHARED_LOCK,
- 0 /* wait flag */, 0);
- if (rc == 0) {
- rc = CIFSSMBLock(xid, tcon, netfid,
- length, pfLock->fl_start, 1, 0,
- lockType |
- LOCKING_ANDX_SHARED_LOCK,
- 0 /* wait flag */, 0);
- pfLock->fl_type = F_RDLCK;
- if (rc != 0)
- cERROR(1, "Error unlocking "
- "previously locked range %d "
- "during test of lock", rc);
- rc = 0;
- } else {
- pfLock->fl_type = F_WRLCK;
- rc = 0;
- }
- }
- }
+ /* BB we could chain these into one lock request BB */
+ rc = CIFSSMBLock(xid, tcon, netfid, current->tgid, length,
+ flock->fl_start, 0, 1, type, 0, 0);
+ if (rc == 0) {
+ rc = CIFSSMBLock(xid, tcon, netfid, current->tgid,
+ length, flock->fl_start, 1, 0,
+ type, 0, 0);
+ flock->fl_type = F_UNLCK;
+ if (rc != 0)
+ cERROR(1, "Error unlocking previously locked "
+ "range %d during test of lock", rc);
+ rc = 0;
+ return rc;
+ }
- FreeXid(xid);
+ if (type & LOCKING_ANDX_SHARED_LOCK) {
+ flock->fl_type = F_WRLCK;
+ rc = 0;
return rc;
}
- if (!numLock && !numUnlock) {
- /* if no lock or unlock then nothing
- to do since we do not know what it is */
- FreeXid(xid);
- return -EOPNOTSUPP;
+ rc = CIFSSMBLock(xid, tcon, netfid, current->tgid, length,
+ flock->fl_start, 0, 1,
+ type | LOCKING_ANDX_SHARED_LOCK, 0, 0);
+ if (rc == 0) {
+ rc = CIFSSMBLock(xid, tcon, netfid, current->tgid,
+ length, flock->fl_start, 1, 0,
+ type | LOCKING_ANDX_SHARED_LOCK,
+ 0, 0);
+ flock->fl_type = F_RDLCK;
+ if (rc != 0)
+ cERROR(1, "Error unlocking previously locked "
+ "range %d during test of lock", rc);
+ } else
+ flock->fl_type = F_WRLCK;
+
+ rc = 0;
+ return rc;
+}
+
+static void
+cifs_move_llist(struct list_head *source, struct list_head *dest)
+{
+ struct list_head *li, *tmp;
+ list_for_each_safe(li, tmp, source)
+ list_move(li, dest);
+}
+
+static void
+cifs_free_llist(struct list_head *llist)
+{
+ struct cifsLockInfo *li, *tmp;
+ list_for_each_entry_safe(li, tmp, llist, llist) {
+ cifs_del_lock_waiters(li);
+ list_del(&li->llist);
+ kfree(li);
}
+}
+
+static int
+cifs_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock, int xid)
+{
+ int rc = 0, stored_rc;
+ int types[] = {LOCKING_ANDX_LARGE_FILES,
+ LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES};
+ unsigned int i;
+ unsigned int max_num, num;
+ LOCKING_ANDX_RANGE *buf, *cur;
+ struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
+ struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
+ struct cifsLockInfo *li, *tmp;
+ __u64 length = 1 + flock->fl_end - flock->fl_start;
+ struct list_head tmp_llist;
+
+ INIT_LIST_HEAD(&tmp_llist);
+
+ max_num = (tcon->ses->server->maxBuf - sizeof(struct smb_hdr)) /
+ sizeof(LOCKING_ANDX_RANGE);
+ buf = kzalloc(max_num * sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ mutex_lock(&cinode->lock_mutex);
+ for (i = 0; i < 2; i++) {
+ cur = buf;
+ num = 0;
+ list_for_each_entry_safe(li, tmp, &cinode->llist, llist) {
+ if (flock->fl_start > li->offset ||
+ (flock->fl_start + length) <
+ (li->offset + li->length))
+ continue;
+ if (current->tgid != li->pid)
+ continue;
+ if (cfile->netfid != li->netfid)
+ continue;
+ if (types[i] != li->type)
+ continue;
+ if (!cinode->can_cache_brlcks) {
+ cur->Pid = cpu_to_le16(li->pid);
+ cur->LengthLow = cpu_to_le32((u32)li->length);
+ cur->LengthHigh =
+ cpu_to_le32((u32)(li->length>>32));
+ cur->OffsetLow = cpu_to_le32((u32)li->offset);
+ cur->OffsetHigh =
+ cpu_to_le32((u32)(li->offset>>32));
+ /*
+ * We need to save a lock here to let us add
+ * it again to the inode list if the unlock
+ * range request fails on the server.
+ */
+ list_move(&li->llist, &tmp_llist);
+ if (++num == max_num) {
+ stored_rc = cifs_lockv(xid, tcon,
+ cfile->netfid,
+ li->type, num,
+ 0, buf);
+ if (stored_rc) {
+ /*
+ * We failed on the unlock range
+ * request - add all locks from
+ * the tmp list to the head of
+ * the inode list.
+ */
+ cifs_move_llist(&tmp_llist,
+ &cinode->llist);
+ rc = stored_rc;
+ } else
+ /*
+ * The unlock range request
+ * succeed - free the tmp list.
+ */
+ cifs_free_llist(&tmp_llist);
+ cur = buf;
+ num = 0;
+ } else
+ cur++;
+ } else {
+ /*
+ * We can cache brlock requests - simply remove
+ * a lock from the inode list.
+ */
+ list_del(&li->llist);
+ cifs_del_lock_waiters(li);
+ kfree(li);
+ }
+ }
+ if (num) {
+ stored_rc = cifs_lockv(xid, tcon, cfile->netfid,
+ types[i], num, 0, buf);
+ if (stored_rc) {
+ cifs_move_llist(&tmp_llist, &cinode->llist);
+ rc = stored_rc;
+ } else
+ cifs_free_llist(&tmp_llist);
+ }
+ }
+
+ mutex_unlock(&cinode->lock_mutex);
+ kfree(buf);
+ return rc;
+}
- if (posix_locking) {
+static int
+cifs_setlk(struct file *file, struct file_lock *flock, __u8 type,
+ bool wait_flag, bool posix_lck, int lock, int unlock, int xid)
+{
+ int rc = 0;
+ __u64 length = 1 + flock->fl_end - flock->fl_start;
+ struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data;
+ struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
+ struct cifsInodeInfo *cinode = CIFS_I(file->f_path.dentry->d_inode);
+ __u16 netfid = cfile->netfid;
+
+ if (posix_lck) {
int posix_lock_type;
- if (lockType & LOCKING_ANDX_SHARED_LOCK)
+
+ rc = cifs_posix_lock_set(file, flock);
+ if (!rc || rc < 0)
+ return rc;
+
+ if (type & LOCKING_ANDX_SHARED_LOCK)
posix_lock_type = CIFS_RDLCK;
else
posix_lock_type = CIFS_WRLCK;
- if (numUnlock == 1)
+ if (unlock == 1)
posix_lock_type = CIFS_UNLCK;
- rc = CIFSSMBPosixLock(xid, tcon, netfid, 0 /* set */,
- length, pfLock, posix_lock_type,
- wait_flag);
- } else {
- struct cifsFileInfo *fid = file->private_data;
-
- if (numLock) {
- rc = CIFSSMBLock(xid, tcon, netfid, length,
- pfLock->fl_start, 0, numLock, lockType,
- wait_flag, 0);
+ rc = CIFSSMBPosixLock(xid, tcon, netfid, current->tgid,
+ 0 /* set */, length, flock,
+ posix_lock_type, wait_flag);
+ goto out;
+ }
- if (rc == 0) {
- /* For Windows locks we must store them. */
- rc = store_file_lock(fid, length,
- pfLock->fl_start, lockType);
- }
- } else if (numUnlock) {
- /* For each stored lock that this unlock overlaps
- completely, unlock it. */
- int stored_rc = 0;
- struct cifsLockInfo *li, *tmp;
+ if (lock) {
+ rc = cifs_lock_add_if(cinode, flock->fl_start, length,
+ type, netfid, wait_flag);
+ if (rc < 0)
+ return rc;
+ else if (!rc)
+ goto out;
- rc = 0;
- mutex_lock(&fid->lock_mutex);
- list_for_each_entry_safe(li, tmp, &fid->llist, llist) {
- if (pfLock->fl_start <= li->offset &&
- (pfLock->fl_start + length) >=
- (li->offset + li->length)) {
- stored_rc = CIFSSMBLock(xid, tcon,
- netfid, li->length,
- li->offset, 1, 0,
- li->type, false, 0);
- if (stored_rc)
- rc = stored_rc;
- else {
- list_del(&li->llist);
- kfree(li);
- }
- }
- }
- mutex_unlock(&fid->lock_mutex);
+ rc = CIFSSMBLock(xid, tcon, netfid, current->tgid, length,
+ flock->fl_start, 0, 1, type, wait_flag, 0);
+ if (rc == 0) {
+ /* For Windows locks we must store them. */
+ rc = cifs_lock_add(cinode, length, flock->fl_start,
+ type, netfid);
}
+ } else if (unlock)
+ rc = cifs_unlock_range(cfile, flock, xid);
+
+out:
+ if (flock->fl_flags & FL_POSIX)
+ posix_lock_file_wait(file, flock);
+ return rc;
+}
+
+int cifs_lock(struct file *file, int cmd, struct file_lock *flock)
+{
+ int rc, xid;
+ int lock = 0, unlock = 0;
+ bool wait_flag = false;
+ bool posix_lck = false;
+ struct cifs_sb_info *cifs_sb;
+ struct cifs_tcon *tcon;
+ struct cifsInodeInfo *cinode;
+ struct cifsFileInfo *cfile;
+ __u16 netfid;
+ __u8 type;
+
+ rc = -EACCES;
+ xid = GetXid();
+
+ cFYI(1, "Lock parm: 0x%x flockflags: 0x%x flocktype: 0x%x start: %lld "
+ "end: %lld", cmd, flock->fl_flags, flock->fl_type,
+ flock->fl_start, flock->fl_end);
+
+ cifs_read_flock(flock, &type, &lock, &unlock, &wait_flag);
+
+ cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
+ cfile = (struct cifsFileInfo *)file->private_data;
+ tcon = tlink_tcon(cfile->tlink);
+ netfid = cfile->netfid;
+ cinode = CIFS_I(file->f_path.dentry->d_inode);
+
+ if ((tcon->ses->capabilities & CAP_UNIX) &&
+ (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
+ ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
+ posix_lck = true;
+ /*
+ * BB add code here to normalize offset and length to account for
+ * negative length which we can not accept over the wire.
+ */
+ if (IS_GETLK(cmd)) {
+ rc = cifs_getlk(file, flock, type, wait_flag, posix_lck, xid);
+ FreeXid(xid);
+ return rc;
}
- if (pfLock->fl_flags & FL_POSIX)
- posix_lock_file_wait(file, pfLock);
+ if (!lock && !unlock) {
+ /*
+ * if no lock or unlock then nothing to do since we do not
+ * know what it is
+ */
+ FreeXid(xid);
+ return -EOPNOTSUPP;
+ }
+
+ rc = cifs_setlk(file, flock, type, wait_flag, posix_lck, lock, unlock,
+ xid);
FreeXid(xid);
return rc;
}
struct smb_com_read_rsp *pSMBr;
struct cifs_io_parms io_parms;
char *read_data;
+ unsigned int rsize;
__u32 pid;
if (!nr_segs)
xid = GetXid();
cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
+ /* FIXME: set up handlers for larger reads and/or convert to async */
+ rsize = min_t(unsigned int, cifs_sb->rsize, CIFSMaxBufSize);
+
open_file = file->private_data;
pTcon = tlink_tcon(open_file->tlink);
cFYI(1, "attempting read on write only file instance");
for (total_read = 0; total_read < len; total_read += bytes_read) {
- cur_len = min_t(const size_t, len - total_read, cifs_sb->rsize);
+ cur_len = min_t(const size_t, len - total_read, rsize);
rc = -EAGAIN;
read_data = NULL;
unsigned int bytes_read = 0;
unsigned int total_read;
unsigned int current_read_size;
+ unsigned int rsize;
struct cifs_sb_info *cifs_sb;
struct cifs_tcon *pTcon;
int xid;
xid = GetXid();
cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
+ /* FIXME: set up handlers for larger reads and/or convert to async */
+ rsize = min_t(unsigned int, cifs_sb->rsize, CIFSMaxBufSize);
+
if (file->private_data == NULL) {
rc = -EBADF;
FreeXid(xid);
for (total_read = 0, current_offset = read_data;
read_size > total_read;
total_read += bytes_read, current_offset += bytes_read) {
- current_read_size = min_t(const int, read_size - total_read,
- cifs_sb->rsize);
+ current_read_size = min_t(uint, read_size - total_read, rsize);
+
/* For windows me and 9x we do not want to request more
than it negotiated since it will refuse the read then */
if ((pTcon->ses) &&
!(pTcon->ses->capabilities & CAP_LARGE_FILES)) {
- current_read_size = min_t(const int, current_read_size,
- pTcon->ses->server->maxBuf - 128);
+ current_read_size = min_t(uint, current_read_size,
+ CIFSMaxBufSize);
}
rc = -EAGAIN;
while (rc == -EAGAIN) {
return rc;
}
-
-static void cifs_copy_cache_pages(struct address_space *mapping,
- struct list_head *pages, int bytes_read, char *data)
-{
- struct page *page;
- char *target;
-
- while (bytes_read > 0) {
- if (list_empty(pages))
- break;
-
- page = list_entry(pages->prev, struct page, lru);
- list_del(&page->lru);
-
- if (add_to_page_cache_lru(page, mapping, page->index,
- GFP_KERNEL)) {
- page_cache_release(page);
- cFYI(1, "Add page cache failed");
- data += PAGE_CACHE_SIZE;
- bytes_read -= PAGE_CACHE_SIZE;
- continue;
- }
- page_cache_release(page);
-
- target = kmap_atomic(page, KM_USER0);
-
- if (PAGE_CACHE_SIZE > bytes_read) {
- memcpy(target, data, bytes_read);
- /* zero the tail end of this partial page */
- memset(target + bytes_read, 0,
- PAGE_CACHE_SIZE - bytes_read);
- bytes_read = 0;
- } else {
- memcpy(target, data, PAGE_CACHE_SIZE);
- bytes_read -= PAGE_CACHE_SIZE;
- }
- kunmap_atomic(target, KM_USER0);
-
- flush_dcache_page(page);
- SetPageUptodate(page);
- unlock_page(page);
- data += PAGE_CACHE_SIZE;
-
- /* add page to FS-Cache */
- cifs_readpage_to_fscache(mapping->host, page);
- }
- return;
-}
-
static int cifs_readpages(struct file *file, struct address_space *mapping,
struct list_head *page_list, unsigned num_pages)
{
- int rc = -EACCES;
- int xid;
- loff_t offset;
- struct page *page;
- struct cifs_sb_info *cifs_sb;
- struct cifs_tcon *pTcon;
- unsigned int bytes_read = 0;
- unsigned int read_size, i;
- char *smb_read_data = NULL;
- struct smb_com_read_rsp *pSMBr;
- struct cifsFileInfo *open_file;
- struct cifs_io_parms io_parms;
- int buf_type = CIFS_NO_BUFFER;
- __u32 pid;
+ int rc;
+ struct list_head tmplist;
+ struct cifsFileInfo *open_file = file->private_data;
+ struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
+ unsigned int rsize = cifs_sb->rsize;
+ pid_t pid;
- xid = GetXid();
- if (file->private_data == NULL) {
- rc = -EBADF;
- FreeXid(xid);
- return rc;
- }
- open_file = file->private_data;
- cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
- pTcon = tlink_tcon(open_file->tlink);
+ /*
+ * Give up immediately if rsize is too small to read an entire page.
+ * The VFS will fall back to readpage. We should never reach this
+ * point however since we set ra_pages to 0 when the rsize is smaller
+ * than a cache page.
+ */
+ if (unlikely(rsize < PAGE_CACHE_SIZE))
+ return 0;
/*
* Reads as many pages as possible from fscache. Returns -ENOBUFS
rc = cifs_readpages_from_fscache(mapping->host, mapping, page_list,
&num_pages);
if (rc == 0)
- goto read_complete;
+ return rc;
- cFYI(DBG2, "rpages: num pages %d", num_pages);
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
pid = open_file->pid;
else
pid = current->tgid;
- for (i = 0; i < num_pages; ) {
- unsigned contig_pages;
- struct page *tmp_page;
- unsigned long expected_index;
+ rc = 0;
+ INIT_LIST_HEAD(&tmplist);
- if (list_empty(page_list))
- break;
+ cFYI(1, "%s: file=%p mapping=%p num_pages=%u", __func__, file,
+ mapping, num_pages);
+
+ /*
+ * Start with the page at end of list and move it to private
+ * list. Do the same with any following pages until we hit
+ * the rsize limit, hit an index discontinuity, or run out of
+ * pages. Issue the async read and then start the loop again
+ * until the list is empty.
+ *
+ * Note that list order is important. The page_list is in
+ * the order of declining indexes. When we put the pages in
+ * the rdata->pages, then we want them in increasing order.
+ */
+ while (!list_empty(page_list)) {
+ unsigned int bytes = PAGE_CACHE_SIZE;
+ unsigned int expected_index;
+ unsigned int nr_pages = 1;
+ loff_t offset;
+ struct page *page, *tpage;
+ struct cifs_readdata *rdata;
page = list_entry(page_list->prev, struct page, lru);
+
+ /*
+ * Lock the page and put it in the cache. Since no one else
+ * should have access to this page, we're safe to simply set
+ * PG_locked without checking it first.
+ */
+ __set_page_locked(page);
+ rc = add_to_page_cache_locked(page, mapping,
+ page->index, GFP_KERNEL);
+
+ /* give up if we can't stick it in the cache */
+ if (rc) {
+ __clear_page_locked(page);
+ break;
+ }
+
+ /* move first page to the tmplist */
offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
+ list_move_tail(&page->lru, &tmplist);
- /* count adjacent pages that we will read into */
- contig_pages = 0;
- expected_index =
- list_entry(page_list->prev, struct page, lru)->index;
- list_for_each_entry_reverse(tmp_page, page_list, lru) {
- if (tmp_page->index == expected_index) {
- contig_pages++;
- expected_index++;
- } else
+ /* now try and add more pages onto the request */
+ expected_index = page->index + 1;
+ list_for_each_entry_safe_reverse(page, tpage, page_list, lru) {
+ /* discontinuity ? */
+ if (page->index != expected_index)
break;
+
+ /* would this page push the read over the rsize? */
+ if (bytes + PAGE_CACHE_SIZE > rsize)
+ break;
+
+ __set_page_locked(page);
+ if (add_to_page_cache_locked(page, mapping,
+ page->index, GFP_KERNEL)) {
+ __clear_page_locked(page);
+ break;
+ }
+ list_move_tail(&page->lru, &tmplist);
+ bytes += PAGE_CACHE_SIZE;
+ expected_index++;
+ nr_pages++;
}
- if (contig_pages + i > num_pages)
- contig_pages = num_pages - i;
-
- /* for reads over a certain size could initiate async
- read ahead */
-
- read_size = contig_pages * PAGE_CACHE_SIZE;
- /* Read size needs to be in multiples of one page */
- read_size = min_t(const unsigned int, read_size,
- cifs_sb->rsize & PAGE_CACHE_MASK);
- cFYI(DBG2, "rpages: read size 0x%x contiguous pages %d",
- read_size, contig_pages);
- rc = -EAGAIN;
- while (rc == -EAGAIN) {
+
+ rdata = cifs_readdata_alloc(nr_pages);
+ if (!rdata) {
+ /* best to give up if we're out of mem */
+ list_for_each_entry_safe(page, tpage, &tmplist, lru) {
+ list_del(&page->lru);
+ lru_cache_add_file(page);
+ unlock_page(page);
+ page_cache_release(page);
+ }
+ rc = -ENOMEM;
+ break;
+ }
+
+ spin_lock(&cifs_file_list_lock);
+ cifsFileInfo_get(open_file);
+ spin_unlock(&cifs_file_list_lock);
+ rdata->cfile = open_file;
+ rdata->mapping = mapping;
+ rdata->offset = offset;
+ rdata->bytes = bytes;
+ rdata->pid = pid;
+ list_splice_init(&tmplist, &rdata->pages);
+
+ do {
if (open_file->invalidHandle) {
rc = cifs_reopen_file(open_file, true);
if (rc != 0)
- break;
+ continue;
}
- io_parms.netfid = open_file->netfid;
- io_parms.pid = pid;
- io_parms.tcon = pTcon;
- io_parms.offset = offset;
- io_parms.length = read_size;
- rc = CIFSSMBRead(xid, &io_parms, &bytes_read,
- &smb_read_data, &buf_type);
- /* BB more RC checks ? */
- if (rc == -EAGAIN) {
- if (smb_read_data) {
- if (buf_type == CIFS_SMALL_BUFFER)
- cifs_small_buf_release(smb_read_data);
- else if (buf_type == CIFS_LARGE_BUFFER)
- cifs_buf_release(smb_read_data);
- smb_read_data = NULL;
- }
- }
- }
- if ((rc < 0) || (smb_read_data == NULL)) {
- cFYI(1, "Read error in readpages: %d", rc);
- break;
- } else if (bytes_read > 0) {
- task_io_account_read(bytes_read);
- pSMBr = (struct smb_com_read_rsp *)smb_read_data;
- cifs_copy_cache_pages(mapping, page_list, bytes_read,
- smb_read_data + 4 /* RFC1001 hdr */ +
- le16_to_cpu(pSMBr->DataOffset));
-
- i += bytes_read >> PAGE_CACHE_SHIFT;
- cifs_stats_bytes_read(pTcon, bytes_read);
- if ((bytes_read & PAGE_CACHE_MASK) != bytes_read) {
- i++; /* account for partial page */
-
- /* server copy of file can have smaller size
- than client */
- /* BB do we need to verify this common case ?
- this case is ok - if we are at server EOF
- we will hit it on next read */
+ rc = cifs_async_readv(rdata);
+ } while (rc == -EAGAIN);
- /* break; */
+ if (rc != 0) {
+ list_for_each_entry_safe(page, tpage, &rdata->pages,
+ lru) {
+ list_del(&page->lru);
+ lru_cache_add_file(page);
+ unlock_page(page);
+ page_cache_release(page);
}
- } else {
- cFYI(1, "No bytes read (%d) at offset %lld . "
- "Cleaning remaining pages from readahead list",
- bytes_read, offset);
- /* BB turn off caching and do new lookup on
- file size at server? */
+ cifs_readdata_free(rdata);
break;
}
- if (smb_read_data) {
- if (buf_type == CIFS_SMALL_BUFFER)
- cifs_small_buf_release(smb_read_data);
- else if (buf_type == CIFS_LARGE_BUFFER)
- cifs_buf_release(smb_read_data);
- smb_read_data = NULL;
- }
- bytes_read = 0;
}
-/* need to free smb_read_data buf before exit */
- if (smb_read_data) {
- if (buf_type == CIFS_SMALL_BUFFER)
- cifs_small_buf_release(smb_read_data);
- else if (buf_type == CIFS_LARGE_BUFFER)
- cifs_buf_release(smb_read_data);
- smb_read_data = NULL;
- }
-
-read_complete:
- FreeXid(xid);
return rc;
}
cFYI(1, "Oplock flush inode %p rc %d", inode, rc);
}
+ rc = cifs_push_locks(cfile);
+ if (rc)
+ cERROR(1, "Push locks rc = %d", rc);
+
/*
* releasing stale oplock after recent reconnect of smb session using
* a now incorrect file handle is not a data integrity issue but do
* disconnected since oplock already released by the server
*/
if (!cfile->oplock_break_cancelled) {
- rc = CIFSSMBLock(0, tlink_tcon(cfile->tlink), cfile->netfid, 0,
- 0, 0, 0, LOCKING_ANDX_OPLOCK_RELEASE, false,
+ rc = CIFSSMBLock(0, tlink_tcon(cfile->tlink), cfile->netfid,
+ current->tgid, 0, 0, 0, 0,
+ LOCKING_ANDX_OPLOCK_RELEASE, false,
cinode->clientCanCacheRead ? 1 : 0);
cFYI(1, "Oplock release rc = %d", rc);
}
git.samba.org / sfrench / cifs-2.6.git / blobdiff