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cifs: move file_lock off stack in cifs_push_posix_locks

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struct file_lock is pretty large, so we really don't want that on the
stack in a potentially long call chain. Reorganize the arguments to
CIFSSMBPosixLock to eliminate the need for that.

Eliminate the get_flag and simply use a non-NULL pLockInfo to indicate
that this is a "get" operation. In order to do that, need to add a new
loff_t argument for the start_offset.

Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
Jeff Layton 2012-07-23 13:28:37 -04:00 committed by Steve French
parent ac3aa2f8ae
commit c5fd363d77
3 changed files with 13 additions and 16 deletions
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5
fs/cifs/cifsproto.h
View file

@ -386,8 +386,9 @@ extern int CIFSSMBLock(const int xid, struct cifs_tcon *tcon,
const bool waitFlag, const __u8 oplock_level);
extern int CIFSSMBPosixLock(const int xid, struct cifs_tcon *tcon,
const __u16 smb_file_id, const __u32 netpid,
const int get_flag, const __u64 len, struct file_lock *,
const __u16 lock_type, const bool waitFlag);
const loff_t start_offset, const __u64 len,
struct file_lock *, const __u16 lock_type,
const bool waitFlag);
extern int CIFSSMBTDis(const int xid, struct cifs_tcon *tcon);
extern int CIFSSMBEcho(struct TCP_Server_Info *server);
extern int CIFSSMBLogoff(const int xid, struct cifs_ses *ses);

16
fs/cifs/cifssmb.c
View file

@ -2356,9 +2356,10 @@ CIFSSMBLock(const int xid, struct cifs_tcon *tcon,
int
CIFSSMBPosixLock(const int xid, struct cifs_tcon *tcon,
const __u16 smb_file_id, const __u32 netpid, const int get_flag,
const __u64 len, struct file_lock *pLockData,
const __u16 lock_type, const bool waitFlag)
const __u16 smb_file_id, const __u32 netpid,
const loff_t start_offset, const __u64 len,
struct file_lock *pLockData, const __u16 lock_type,
const bool waitFlag)
{
struct smb_com_transaction2_sfi_req *pSMB = NULL;
struct smb_com_transaction2_sfi_rsp *pSMBr = NULL;
@ -2372,9 +2373,6 @@ CIFSSMBPosixLock(const int xid, struct cifs_tcon *tcon,
cFYI(1, "Posix Lock");
if (pLockData == NULL)
return -EINVAL;
rc = small_smb_init(SMB_COM_TRANSACTION2, 15, tcon, (void **) &pSMB);
if (rc)
@ -2395,7 +2393,7 @@ CIFSSMBPosixLock(const int xid, struct cifs_tcon *tcon,
pSMB->MaxDataCount = cpu_to_le16(1000); /* BB find max SMB from sess */
pSMB->SetupCount = 1;
pSMB->Reserved3 = 0;
if (get_flag)
if (pLockData)
pSMB->SubCommand = cpu_to_le16(TRANS2_QUERY_FILE_INFORMATION);
else
pSMB->SubCommand = cpu_to_le16(TRANS2_SET_FILE_INFORMATION);
@ -2417,7 +2415,7 @@ CIFSSMBPosixLock(const int xid, struct cifs_tcon *tcon,
pSMB->Timeout = 0;
parm_data->pid = cpu_to_le32(netpid);
parm_data->start = cpu_to_le64(pLockData->fl_start);
parm_data->start = cpu_to_le64(start_offset);
parm_data->length = cpu_to_le64(len); /* normalize negative numbers */
pSMB->DataOffset = cpu_to_le16(offset);
@ -2441,7 +2439,7 @@ CIFSSMBPosixLock(const int xid, struct cifs_tcon *tcon,
if (rc) {
cFYI(1, "Send error in Posix Lock = %d", rc);
} else if (get_flag) {
} else if (pLockData) {
/* lock structure can be returned on get */
__u16 data_offset;
__u16 data_count;

8
fs/cifs/file.c
View file

@ -1039,12 +1039,10 @@ cifs_push_posix_locks(struct cifsFileInfo *cfile)
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->offset, lck->length, NULL,
lck->type, 0);
if (stored_rc)
rc = stored_rc;
@ -1159,7 +1157,7 @@ cifs_getlk(struct file *file, struct file_lock *flock, __u32 type,
else
posix_lock_type = CIFS_WRLCK;
rc = CIFSSMBPosixLock(xid, tcon, netfid, current->tgid,
1 /* get */, length, flock,
flock->fl_start, length, flock,
posix_lock_type, wait_flag);
return rc;
}
@ -1353,7 +1351,7 @@ cifs_setlk(struct file *file, struct file_lock *flock, __u32 type,
posix_lock_type = CIFS_UNLCK;
rc = CIFSSMBPosixLock(xid, tcon, netfid, current->tgid,
0 /* set */, length, flock,
flock->fl_start, length, NULL,
posix_lock_type, wait_flag);
goto out;
}