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CIFS: Move byte range lock list from fd to inode 

that let us do local lock checks before requesting to the server.

Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
Pavel Shilovsky 2011-09-22 09:53:59 +04:00 committed by Steve French
parent fe11e4ccb8
commit d59dad2be0
3 changed files with 23 additions and 17 deletions
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3
fs/cifs/cifsfs.c
View File

@ -945,7 +945,8 @@ cifs_init_once(void *inode)
struct cifsInodeInfo *cifsi = inode;
inode_init_once(&cifsi->vfs_inode);
INIT_LIST_HEAD(&cifsi->lockList);
INIT_LIST_HEAD(&cifsi->llist);
mutex_init(&cifsi->lock_mutex);
}
static int

7
fs/cifs/cifsglob.h
View File

@ -494,6 +494,7 @@ struct cifsLockInfo {
__u64 length;
__u32 pid;
__u8 type;
__u16 netfid;
};
/*
@ -526,8 +527,6 @@ struct cifsFileInfo {
struct dentry *dentry;
unsigned int f_flags;
struct tcon_link *tlink;
struct mutex lock_mutex;
struct list_head llist; /* list of byte range locks we have. */
bool invalidHandle:1; /* file closed via session abend */
bool oplock_break_cancelled:1;
int count; /* refcount protected by cifs_file_list_lock */
@ -560,7 +559,9 @@ void cifsFileInfo_put(struct cifsFileInfo *cifs_file);
*/
struct cifsInodeInfo {
struct list_head lockList;
struct list_head llist; /* brlocks for this inode */
bool can_cache_brlcks;
struct mutex lock_mutex; /* protect two fields above */
/* BB add in lists for dirty pages i.e. write caching info for oplock */
struct list_head openFileList;
__u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */

30
fs/cifs/file.c
View File

@ -262,8 +262,6 @@ cifs_new_fileinfo(__u16 fileHandle, struct file *file,
pCifsFile->invalidHandle = false;
pCifsFile->tlink = cifs_get_tlink(tlink);
mutex_init(&pCifsFile->fh_mutex);
mutex_init(&pCifsFile->lock_mutex);
INIT_LIST_HEAD(&pCifsFile->llist);
INIT_WORK(&pCifsFile->oplock_break, cifs_oplock_break);
spin_lock(&cifs_file_list_lock);
@ -331,12 +329,14 @@ void cifsFileInfo_put(struct cifsFileInfo *cifs_file)
/* Delete any outstanding lock records. We'll lose them when the file
* is closed anyway.
*/
mutex_lock(&cifs_file->lock_mutex);
list_for_each_entry_safe(li, tmp, &cifs_file->llist, llist) {
mutex_lock(&cifsi->lock_mutex);
list_for_each_entry_safe(li, tmp, &cifsi->llist, llist) {
if (li->netfid != cifs_file->netfid)
continue;
list_del(&li->llist);
kfree(li);
}
mutex_unlock(&cifs_file->lock_mutex);
mutex_unlock(&cifsi->lock_mutex);
cifs_put_tlink(cifs_file->tlink);
dput(cifs_file->dentry);
@ -639,20 +639,21 @@ int cifs_closedir(struct inode *inode, struct file *file)
return rc;
}
static int store_file_lock(struct cifsFileInfo *cfile, __u64 len,
static int store_file_lock(struct cifsInodeInfo *cinode, __u64 len,
__u64 offset, __u8 type, __u16 netfid)
{
struct cifsLockInfo *li =
kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL);
if (li == NULL)
return -ENOMEM;
li->netfid = netfid;
li->offset = offset;
li->length = len;
li->type = type;
li->pid = current->tgid;
mutex_lock(&cfile->lock_mutex);
list_add_tail(&li->llist, &cfile->llist);
mutex_unlock(&cfile->lock_mutex);
mutex_lock(&cinode->lock_mutex);
list_add_tail(&li->llist, &cinode->llist);
mutex_unlock(&cinode->lock_mutex);
return 0;
}
@ -769,6 +770,7 @@ cifs_setlk(struct file *file, struct file_lock *flock, __u8 type,
__u64 length = 1 + flock->fl_end - flock->fl_start;
struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data;
struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
struct cifsInodeInfo *cinode = CIFS_I(file->f_path.dentry->d_inode);
__u16 netfid = cfile->netfid;
if (posix_lck) {
@ -791,7 +793,7 @@ cifs_setlk(struct file *file, struct file_lock *flock, __u8 type,
flock->fl_start, 0, lock, type, wait_flag, 0);
if (rc == 0) {
/* For Windows locks we must store them. */
rc = store_file_lock(cfile, length, flock->fl_start,
rc = store_file_lock(cinode, length, flock->fl_start,
type, netfid);
}
} else if (unlock) {
@ -802,14 +804,16 @@ cifs_setlk(struct file *file, struct file_lock *flock, __u8 type,
int stored_rc = 0;
struct cifsLockInfo *li, *tmp;
mutex_lock(&cfile->lock_mutex);
list_for_each_entry_safe(li, tmp, &cfile->llist, llist) {
mutex_lock(&cinode->lock_mutex);
list_for_each_entry_safe(li, tmp, &cinode->llist, llist) {
if (flock->fl_start > li->offset ||
(flock->fl_start + length) <
(li->offset + li->length))
continue;
if (current->tgid != li->pid)
continue;
if (cfile->netfid != li->netfid)
continue;
stored_rc = CIFSSMBLock(xid, tcon, netfid,
current->tgid, li->length,
@ -822,7 +826,7 @@ cifs_setlk(struct file *file, struct file_lock *flock, __u8 type,
kfree(li);
}
}
mutex_unlock(&cfile->lock_mutex);
mutex_unlock(&cinode->lock_mutex);
}
out:
if (flock->fl_flags & FL_POSIX)