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| author | Pavel Shilovsky <pshilovsky@etersoft.ru> | 2012-09-19 06:22:44 -0700 |
|---|---|---|
| committer | Steve French <smfrench@gmail.com> | 2012-09-24 21:46:33 -0500 |
| commit | 1b4b55a1d9404f51aacf1ff19887eb911484057d (patch) | |
| tree | e2909277cc8db445c1d839c4859449a32cbfc08a /fs/cifs/smb2file.c | |
| parent | b140799a11adb6023d5f96712874c37b71dab290 (diff) | |
| download | linux-1b4b55a1d9404f51aacf1ff19887eb911484057d.tar.gz linux-1b4b55a1d9404f51aacf1ff19887eb911484057d.tar.bz2 linux-1b4b55a1d9404f51aacf1ff19887eb911484057d.zip | |
CIFS: Turn lock mutex into rw semaphore
and allow several processes to walk through the lock list and read
can_cache_brlcks value if they are not going to modify them.
Signed-off-by: Pavel Shilovsky <pshilovsky@etersoft.ru>
Signed-off-by: Steve French <sfrench@us.ibm.com>
Diffstat (limited to 'fs/cifs/smb2file.c')
| -rw-r--r-- | fs/cifs/smb2file.c | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/fs/cifs/smb2file.c b/fs/cifs/smb2file.c index 181e13d9f9db..0ddd617ffa1a 100644 --- a/fs/cifs/smb2file.c +++ b/fs/cifs/smb2file.c @@ -135,7 +135,7 @@ smb2_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock, cur = buf; - mutex_lock(&cinode->lock_mutex); + down_write(&cinode->lock_sem); list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) { if (flock->fl_start > li->offset || (flock->fl_start + length) < @@ -196,7 +196,7 @@ smb2_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock, } else cifs_free_llist(&tmp_llist); } - mutex_unlock(&cinode->lock_mutex); + up_write(&cinode->lock_sem); kfree(buf); return rc; @@ -253,9 +253,10 @@ smb2_push_mandatory_locks(struct cifsFileInfo *cfile) struct cifs_fid_locks *fdlocks; xid = get_xid(); - mutex_lock(&cinode->lock_mutex); + /* we are going to update can_cache_brlcks here - need a write access */ + down_write(&cinode->lock_sem); if (!cinode->can_cache_brlcks) { - mutex_unlock(&cinode->lock_mutex); + up_write(&cinode->lock_sem); free_xid(xid); return rc; } @@ -266,7 +267,7 @@ smb2_push_mandatory_locks(struct cifsFileInfo *cfile) */ max_buf = tlink_tcon(cfile->tlink)->ses->server->maxBuf; if (!max_buf) { - mutex_unlock(&cinode->lock_mutex); + up_write(&cinode->lock_sem); free_xid(xid); return -EINVAL; } @@ -274,7 +275,7 @@ smb2_push_mandatory_locks(struct cifsFileInfo *cfile) max_num = max_buf / sizeof(struct smb2_lock_element); buf = kzalloc(max_num * sizeof(struct smb2_lock_element), GFP_KERNEL); if (!buf) { - mutex_unlock(&cinode->lock_mutex); + up_write(&cinode->lock_sem); free_xid(xid); return -ENOMEM; } @@ -288,7 +289,7 @@ smb2_push_mandatory_locks(struct cifsFileInfo *cfile) cinode->can_cache_brlcks = false; kfree(buf); - mutex_unlock(&cinode->lock_mutex); + up_write(&cinode->lock_sem); free_xid(xid); return rc; } |