diff options
| author | Jeff Layton <jlayton@redhat.com> | 2010-10-15 23:34:06 +0400 |
|---|---|---|
| committer | Steve French <sfrench@us.ibm.com> | 2010-10-25 04:18:59 +0400 |
| commit | 5f6dbc9e4afe4d1d39e85de3ac2720a2042ad191 (patch) | |
| tree | 8e97fe18b6d0824981fd377b2ff35042da264bb4 /fs/cifs | |
| parent | 229aebb873e29726b91e076161649cf45154b0bf (diff) | |
| download | linux-5f6dbc9e4afe4d1d39e85de3ac2720a2042ad191.tar.xz | |
cifs: convert cifsFileInfo->count to non-atomic counter
The count for cifsFileInfo is currently an atomic, but that just adds
complexity for little value. We generally need to hold cifs_file_list_lock
to traverse the lists anyway so we might as well make this counter
non-atomic and simply use the cifs_file_list_lock to protect it.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Reviewed-by: Suresh Jayaraman <sjayaraman@suse.de>
Signed-off-by: Steve French <sfrench@us.ibm.com>
Diffstat (limited to 'fs/cifs')
| -rw-r--r-- | fs/cifs/cifsglob.h | 9 | ||||
| -rw-r--r-- | fs/cifs/file.c | 8 |
2 files changed, 11 insertions, 6 deletions
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h index 3365e77f6f24..6319db025e7b 100644 --- a/fs/cifs/cifsglob.h +++ b/fs/cifs/cifsglob.h @@ -395,16 +395,19 @@ struct cifsFileInfo { struct list_head llist; /* list of byte range locks we have. */ bool invalidHandle:1; /* file closed via session abend */ bool oplock_break_cancelled:1; - atomic_t count; /* reference count */ + int count; /* refcount -- protected by cifs_file_list_lock */ struct mutex fh_mutex; /* prevents reopen race after dead ses*/ struct cifs_search_info srch_inf; struct work_struct oplock_break; /* work for oplock breaks */ }; -/* Take a reference on the file private data */ +/* + * Take a reference on the file private data. Must be called with + * cifs_file_list_lock held. + */ static inline void cifsFileInfo_get(struct cifsFileInfo *cifs_file) { - atomic_inc(&cifs_file->count); + ++cifs_file->count; } void cifsFileInfo_put(struct cifsFileInfo *cifs_file); diff --git a/fs/cifs/file.c b/fs/cifs/file.c index 8c81e7b14d53..baf4b5067ff9 100644 --- a/fs/cifs/file.c +++ b/fs/cifs/file.c @@ -232,6 +232,7 @@ cifs_new_fileinfo(__u16 fileHandle, struct file *file, if (pCifsFile == NULL) return pCifsFile; + pCifsFile->count = 1; pCifsFile->netfid = fileHandle; pCifsFile->pid = current->tgid; pCifsFile->uid = current_fsuid(); @@ -242,7 +243,6 @@ cifs_new_fileinfo(__u16 fileHandle, struct file *file, mutex_init(&pCifsFile->fh_mutex); mutex_init(&pCifsFile->lock_mutex); INIT_LIST_HEAD(&pCifsFile->llist); - atomic_set(&pCifsFile->count, 1); INIT_WORK(&pCifsFile->oplock_break, cifs_oplock_break); spin_lock(&cifs_file_list_lock); @@ -267,7 +267,8 @@ cifs_new_fileinfo(__u16 fileHandle, struct file *file, /* * Release a reference on the file private data. This may involve closing - * the filehandle out on the server. + * the filehandle out on the server. Must be called without holding + * cifs_file_list_lock. */ void cifsFileInfo_put(struct cifsFileInfo *cifs_file) { @@ -276,7 +277,7 @@ void cifsFileInfo_put(struct cifsFileInfo *cifs_file) struct cifsLockInfo *li, *tmp; spin_lock(&cifs_file_list_lock); - if (!atomic_dec_and_test(&cifs_file->count)) { + if (--cifs_file->count > 0) { spin_unlock(&cifs_file_list_lock); return; } @@ -2322,6 +2323,7 @@ void cifs_oplock_break(struct work_struct *work) cifs_oplock_break_put(cfile); } +/* must be called while holding cifs_file_list_lock */ void cifs_oplock_break_get(struct cifsFileInfo *cfile) { cifs_sb_active(cfile->dentry->d_sb); |