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Merge branch 'flock' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl

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* '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
This commit is contained in:
Linus Torvalds
2010-10-27 18:13:34 -07:00
parent 12ba8d1e92 72f98e7255
commit 7420a8c0de
10 changed files with 116 additions and 72 deletions
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57
fs/locks.c
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@@ -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;
}