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author | Linus Torvalds <torvalds@linux-foundation.org> | 2010-10-27 18:13:34 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-10-27 18:13:34 -0700 |
commit | 7420a8c0de8d99b201aeeab6fed16ca95ebf55a5 (patch) | |
tree | 0787800f490f98ffd41b958e52ab15732335744e /fs/locks.c | |
parent | 12ba8d1e9262ce81a695795410bd9ee5c9407ba1 (diff) | |
parent | 72f98e72551fad573c6cace8e8551ef094f482dd (diff) | |
download | linux-7420a8c0de8d99b201aeeab6fed16ca95ebf55a5.tar.bz2 |
Merge branch 'flock' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl
* 'flock' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl:
locks: turn lock_flocks into a spinlock
fasync: re-organize fasync entry insertion to allow it under a spinlock
locks/nfsd: allocate file lock outside of spinlock
lockd: fix nlmsvc_notify_blocked locking
lockd: push lock_flocks down
Diffstat (limited to 'fs/locks.c')
-rw-r--r-- | fs/locks.c | 57 |
1 files changed, 31 insertions, 26 deletions
diff --git a/fs/locks.c b/fs/locks.c index 4de3a2666810..50ec15927aab 100644 --- a/fs/locks.c +++ b/fs/locks.c @@ -142,6 +142,7 @@ int lease_break_time = 45; static LIST_HEAD(file_lock_list); static LIST_HEAD(blocked_list); +static DEFINE_SPINLOCK(file_lock_lock); /* * Protects the two list heads above, plus the inode->i_flock list @@ -149,23 +150,24 @@ static LIST_HEAD(blocked_list); */ void lock_flocks(void) { - lock_kernel(); + spin_lock(&file_lock_lock); } EXPORT_SYMBOL_GPL(lock_flocks); void unlock_flocks(void) { - unlock_kernel(); + spin_unlock(&file_lock_lock); } EXPORT_SYMBOL_GPL(unlock_flocks); static struct kmem_cache *filelock_cache __read_mostly; /* Allocate an empty lock structure. */ -static struct file_lock *locks_alloc_lock(void) +struct file_lock *locks_alloc_lock(void) { return kmem_cache_alloc(filelock_cache, GFP_KERNEL); } +EXPORT_SYMBOL_GPL(locks_alloc_lock); void locks_release_private(struct file_lock *fl) { @@ -1365,7 +1367,6 @@ int fcntl_getlease(struct file *filp) int generic_setlease(struct file *filp, long arg, struct file_lock **flp) { struct file_lock *fl, **before, **my_before = NULL, *lease; - struct file_lock *new_fl = NULL; struct dentry *dentry = filp->f_path.dentry; struct inode *inode = dentry->d_inode; int error, rdlease_count = 0, wrlease_count = 0; @@ -1385,11 +1386,6 @@ int generic_setlease(struct file *filp, long arg, struct file_lock **flp) lease = *flp; if (arg != F_UNLCK) { - error = -ENOMEM; - new_fl = locks_alloc_lock(); - if (new_fl == NULL) - goto out; - error = -EAGAIN; if ((arg == F_RDLCK) && (atomic_read(&inode->i_writecount) > 0)) goto out; @@ -1434,7 +1430,6 @@ int generic_setlease(struct file *filp, long arg, struct file_lock **flp) goto out; } - error = 0; if (arg == F_UNLCK) goto out; @@ -1442,15 +1437,11 @@ int generic_setlease(struct file *filp, long arg, struct file_lock **flp) if (!leases_enable) goto out; - locks_copy_lock(new_fl, lease); - locks_insert_lock(before, new_fl); - - *flp = new_fl; + locks_insert_lock(before, lease); return 0; out: - if (new_fl != NULL) - locks_free_lock(new_fl); + locks_free_lock(lease); return error; } EXPORT_SYMBOL(generic_setlease); @@ -1514,26 +1505,38 @@ EXPORT_SYMBOL_GPL(vfs_setlease); */ int fcntl_setlease(unsigned int fd, struct file *filp, long arg) { - struct file_lock fl, *flp = &fl; + struct file_lock *fl; + struct fasync_struct *new; struct inode *inode = filp->f_path.dentry->d_inode; int error; - locks_init_lock(&fl); - error = lease_init(filp, arg, &fl); - if (error) - return error; + fl = lease_alloc(filp, arg); + if (IS_ERR(fl)) + return PTR_ERR(fl); + new = fasync_alloc(); + if (!new) { + locks_free_lock(fl); + return -ENOMEM; + } lock_flocks(); - - error = __vfs_setlease(filp, arg, &flp); + error = __vfs_setlease(filp, arg, &fl); if (error || arg == F_UNLCK) goto out_unlock; - error = fasync_helper(fd, filp, 1, &flp->fl_fasync); + /* + * fasync_insert_entry() returns the old entry if any. + * If there was no old entry, then it used 'new' and + * inserted it into the fasync list. Clear new so that + * we don't release it here. + */ + if (!fasync_insert_entry(fd, filp, &fl->fl_fasync, new)) + new = NULL; + if (error < 0) { /* remove lease just inserted by setlease */ - flp->fl_type = F_UNLCK | F_INPROGRESS; - flp->fl_break_time = jiffies - 10; + fl->fl_type = F_UNLCK | F_INPROGRESS; + fl->fl_break_time = jiffies - 10; time_out_leases(inode); goto out_unlock; } @@ -1541,6 +1544,8 @@ int fcntl_setlease(unsigned int fd, struct file *filp, long arg) error = __f_setown(filp, task_pid(current), PIDTYPE_PID, 0); out_unlock: unlock_flocks(); + if (new) + fasync_free(new); return error; } |