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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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15
fs/cifs/cifssmb.c
View File

@ -1810,8 +1810,21 @@ CIFSSMBPosixLock(const int xid, struct cifsTconInfo *tcon,
}
parm_data = (struct cifs_posix_lock *)
((char *)&pSMBr->hdr.Protocol + data_offset);
if (parm_data->lock_type == cpu_to_le16(CIFS_UNLCK))
if (parm_data->lock_type == __constant_cpu_to_le16(CIFS_UNLCK))
pLockData->fl_type = F_UNLCK;
else {
if (parm_data->lock_type ==
__constant_cpu_to_le16(CIFS_RDLCK))
pLockData->fl_type = F_RDLCK;
else if (parm_data->lock_type ==
__constant_cpu_to_le16(CIFS_WRLCK))
pLockData->fl_type = F_WRLCK;
pLockData->fl_start = parm_data->start;
pLockData->fl_end = parm_data->start +
parm_data->length - 1;
pLockData->fl_pid = parm_data->pid;
}
}
plk_err_exit:

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);