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not overwriting file_lock structure after GET_LK

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If we have preventing lock, cifs should overwrite file_lock structure
with info about preventing lock. If we haven't preventing lock, cifs
should leave it unchanged except for the lock type (change it to F_UNLCK).

Signed-off-by: Pavel Shilovsky <piastryyy@gmail.com>
Reviewed-by: Jeff Layton <jlayton@samba.org>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Pavel Shilovsky 2010-04-05 09:59:14 +04:00 • committed by Steve French
parent 6513a81e93
commit f05337c6ac
2 changed files with 40 additions and 3 deletions
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28
fs/cifs/file.c
View file

@ -838,8 +838,32 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
} else {
/* if rc == ERR_SHARING_VIOLATION ? */
rc = 0; /* do not change lock type to unlock
since range in use */
rc = 0;
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 */);
if (rc == 0) {
rc = CIFSSMBLock(xid, tcon, netfid,
length, pfLock->fl_start, 1, 0,
lockType |
LOCKING_ANDX_SHARED_LOCK,
0 /* wait flag */);
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;
}
}
}
FreeXid(xid);