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CIFS: Fix oplock break handling (try #2)

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When we get oplock break notification we should set the appropriate
value of OplockLevel field in oplock break acknowledge according to
the oplock level held by the client in this time. As we only can have
level II oplock or no oplock in the case of oplock break, we should be
aware only about clientCanCacheRead field in cifsInodeInfo structure.

Also fix bug connected with wrong interpretation of OplockLevel field
during oplock break notification processing.

Signed-off-by: Pavel Shilovsky <piastryyy@gmail.com>
Cc: <stable@kernel.org>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Pavel Shilovsky
2011-01-17 20:15:44 +03:00
committed by Steve French
parent c56eb8fb6d
commit 12fed00de9
4 changed files with 16 additions and 13 deletions
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21
fs/cifs/file.c
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@ -726,12 +726,12 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
/* 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, 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 /* wait flag */, 0);
pfLock->fl_type = F_UNLCK;
if (rc != 0)
cERROR(1, "Error unlocking previously locked "
@ -748,13 +748,13 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
rc = CIFSSMBLock(xid, tcon, netfid, length,
pfLock->fl_start, 0, 1,
lockType | LOCKING_ANDX_SHARED_LOCK,
0 /* wait flag */);
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 /* wait flag */, 0);
pfLock->fl_type = F_RDLCK;
if (rc != 0)
cERROR(1, "Error unlocking "
@ -797,8 +797,8 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
if (numLock) {
rc = CIFSSMBLock(xid, tcon, netfid, length,
pfLock->fl_start,
0, numLock, lockType, wait_flag);
pfLock->fl_start, 0, numLock, lockType,
wait_flag, 0);
if (rc == 0) {
/* For Windows locks we must store them. */
@ -818,9 +818,9 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
(pfLock->fl_start + length) >=
(li->offset + li->length)) {
stored_rc = CIFSSMBLock(xid, tcon,
netfid,
li->length, li->offset,
1, 0, li->type, false);
netfid, li->length,
li->offset, 1, 0,
li->type, false, 0);
if (stored_rc)
rc = stored_rc;
else {
@ -2192,7 +2192,8 @@ void cifs_oplock_break(struct work_struct *work)
*/
if (!cfile->oplock_break_cancelled) {
rc = CIFSSMBLock(0, tlink_tcon(cfile->tlink), cfile->netfid, 0,
0, 0, 0, LOCKING_ANDX_OPLOCK_RELEASE, false);
0, 0, 0, LOCKING_ANDX_OPLOCK_RELEASE, false,
cinode->clientCanCacheRead ? 1 : 0);
cFYI(1, "Oplock release rc = %d", rc);
}