Now we need to lock/unlock a spinlock while processing brlock ops on
the inode. Move brlocks of a fid to a separate list and attach all
such lists to the inode. This let us not hold a spinlock.
SMB2 brlocking also needs this as the initial step before sorting brlocks
by pid inside the fid list due to the SMB2 protocol limitation that doesn't
allow to send a group of brlocks with different pids.
Signed-off-by: Pavel Shilovsky <pshilovsky@xxxxxxxxx>
---
fs/cifs/cifsfs.c | 1 +
fs/cifs/cifsglob.h | 18 +++++++++---------
fs/cifs/file.c | 47 +++++++++++++++++++++++++++++++----------------
3 files changed, 41 insertions(+), 25 deletions(-)
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 3a3e2fe..e958d94 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -233,6 +233,7 @@ cifs_alloc_inode(struct super_block *sb)
to zero by the VFS */
/* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/
INIT_LIST_HEAD(&cifs_inode->openFileList);
+ INIT_LIST_HEAD(&cifs_inode->llist);
return &cifs_inode->vfs_inode;
}
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index b2bb941..93cd2e7 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -890,13 +890,16 @@ struct cifs_fid {
#endif
};
+struct cifs_fid_locks {
+ struct list_head llist;
+ struct cifsFileInfo *cfile; /* fid that owns locks */
+ struct list_head locks; /* locks held by fid above */
+};
+
struct cifsFileInfo {
struct list_head tlist; /* pointer to next fid owned by tcon */
struct list_head flist; /* next fid (file instance) for this inode */
- struct list_head llist; /*
- * brlocks held by this fid, protected by
- * lock_mutex from cifsInodeInfo structure
- */
+ struct cifs_fid_locks *llist; /* brlocks held by this fid */
unsigned int uid; /* allows finding which FileInfo structure */
__u32 pid; /* process id who opened file */
struct cifs_fid fid; /* file id from remote */
@@ -988,11 +991,8 @@ void cifsFileInfo_put(struct cifsFileInfo *cifs_file);
struct cifsInodeInfo {
bool can_cache_brlcks;
- struct mutex lock_mutex; /*
- * protect the field above and llist
- * from every cifsFileInfo structure
- * from openFileList
- */
+ struct list_head llist; /* locks helb by this inode */
+ struct mutex lock_mutex; /* protect the 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 */
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 18098c8..4452394 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -245,11 +245,25 @@ cifs_new_fileinfo(struct cifs_fid *fid, struct file *file,
struct inode *inode = dentry->d_inode;
struct cifsInodeInfo *cinode = CIFS_I(inode);
struct cifsFileInfo *cfile;
+ struct cifs_fid_locks *fdlocks;
cfile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
if (cfile == NULL)
return cfile;
+ fdlocks = kzalloc(sizeof(struct cifs_fid_locks), GFP_KERNEL);
+ if (!fdlocks) {
+ kfree(cfile);
+ return NULL;
+ }
+
+ INIT_LIST_HEAD(&fdlocks->locks);
+ fdlocks->cfile = cfile;
+ cfile->llist = fdlocks;
+ mutex_lock(&cinode->lock_mutex);
+ list_add(&fdlocks->llist, &cinode->llist);
+ mutex_unlock(&cinode->lock_mutex);
+
cfile->count = 1;
cfile->pid = current->tgid;
cfile->uid = current_fsuid();
@@ -257,9 +271,8 @@ cifs_new_fileinfo(struct cifs_fid *fid, struct file *file,
cfile->f_flags = file->f_flags;
cfile->invalidHandle = false;
cfile->tlink = cifs_get_tlink(tlink);
- mutex_init(&cfile->fh_mutex);
INIT_WORK(&cfile->oplock_break, cifs_oplock_break);
- INIT_LIST_HEAD(&cfile->llist);
+ mutex_init(&cfile->fh_mutex);
tlink_tcon(tlink)->ses->server->ops->set_fid(cfile, fid, oplock);
spin_lock(&cifs_file_list_lock);
@@ -340,11 +353,13 @@ void cifsFileInfo_put(struct cifsFileInfo *cifs_file)
* is closed anyway.
*/
mutex_lock(&cifsi->lock_mutex);
- list_for_each_entry_safe(li, tmp, &cifs_file->llist, llist) {
+ list_for_each_entry_safe(li, tmp, &cifs_file->llist->locks, llist) {
list_del(&li->llist);
cifs_del_lock_waiters(li);
kfree(li);
}
+ list_del(&cifs_file->llist->llist);
+ kfree(cifs_file->llist);
mutex_unlock(&cifsi->lock_mutex);
cifs_put_tlink(cifs_file->tlink);
@@ -691,14 +706,15 @@ cifs_del_lock_waiters(struct cifsLockInfo *lock)
}
static bool
-cifs_find_fid_lock_conflict(struct cifsFileInfo *cfile, __u64 offset,
+cifs_find_fid_lock_conflict(struct cifs_fid_locks *fdlocks, __u64 offset,
__u64 length, __u8 type, struct cifsFileInfo *cur,
struct cifsLockInfo **conf_lock)
{
struct cifsLockInfo *li;
+ struct cifsFileInfo *cfile = fdlocks->cfile;
struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
- list_for_each_entry(li, &cfile->llist, llist) {
+ list_for_each_entry(li, &fdlocks->locks, llist) {
if (offset + length <= li->offset ||
offset >= li->offset + li->length)
continue;
@@ -719,17 +735,15 @@ cifs_find_lock_conflict(struct cifsFileInfo *cfile, __u64 offset, __u64 length,
__u8 type, struct cifsLockInfo **conf_lock)
{
bool rc = false;
- struct cifsFileInfo *fid, *tmp;
+ struct cifs_fid_locks *cur, *tmp;
struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
- spin_lock(&cifs_file_list_lock);
- list_for_each_entry_safe(fid, tmp, &cinode->openFileList, flist) {
- rc = cifs_find_fid_lock_conflict(fid, offset, length, type,
+ list_for_each_entry_safe(cur, tmp, &cinode->llist, llist) {
+ rc = cifs_find_fid_lock_conflict(cur, offset, length, type,
cfile, conf_lock);
if (rc)
break;
}
- spin_unlock(&cifs_file_list_lock);
return rc;
}
@@ -777,7 +791,7 @@ cifs_lock_add(struct cifsFileInfo *cfile, struct cifsLockInfo *lock)
{
struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
mutex_lock(&cinode->lock_mutex);
- list_add_tail(&lock->llist, &cfile->llist);
+ list_add_tail(&lock->llist, &cfile->llist->locks);
mutex_unlock(&cinode->lock_mutex);
}
@@ -803,7 +817,7 @@ try_again:
exist = cifs_find_lock_conflict(cfile, lock->offset, lock->length,
lock->type, &conf_lock);
if (!exist && cinode->can_cache_brlcks) {
- list_add_tail(&lock->llist, &cfile->llist);
+ list_add_tail(&lock->llist, &cfile->llist->locks);
mutex_unlock(&cinode->lock_mutex);
return rc;
}
@@ -937,7 +951,7 @@ cifs_push_mandatory_locks(struct cifsFileInfo *cfile)
for (i = 0; i < 2; i++) {
cur = buf;
num = 0;
- list_for_each_entry_safe(li, tmp, &cfile->llist, llist) {
+ list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) {
if (li->type != types[i])
continue;
cur->Pid = cpu_to_le16(li->pid);
@@ -1279,7 +1293,7 @@ cifs_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock,
for (i = 0; i < 2; i++) {
cur = buf;
num = 0;
- list_for_each_entry_safe(li, tmp, &cfile->llist, llist) {
+ list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) {
if (flock->fl_start > li->offset ||
(flock->fl_start + length) <
(li->offset + li->length))
@@ -1320,7 +1334,7 @@ cifs_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock,
* list to the head of the file's list.
*/
cifs_move_llist(&tmp_llist,
- &cfile->llist);
+ &cfile->llist->locks);
rc = stored_rc;
} else
/*
@@ -1337,7 +1351,8 @@ cifs_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock,
stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid,
types[i], num, 0, buf);
if (stored_rc) {
- cifs_move_llist(&tmp_llist, &cfile->llist);
+ cifs_move_llist(&tmp_llist,
+ &cfile->llist->locks);
rc = stored_rc;
} else
cifs_free_llist(&tmp_llist);
--
1.7.1
--
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