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locks/nfsd: allocate file lock outside of spinlock

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As suggested by Christoph Hellwig, this moves allocation
of new file locks out of generic_setlease into the
callers, nfs4_open_delegation and fcntl_setlease in order
to allow GFP_KERNEL allocations when lock_flocks has
become a spinlock.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Arnd Bergmann
2010-10-27 15:46:08 +02:00
parent a282a1fa6b
commit c5b1f0d92c
3 changed files with 28 additions and 35 deletions
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36
fs/locks.c
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@@ -162,10 +162,11 @@ 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 +1366,6 @@ 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 +1385,6 @@ 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 +1429,6 @@ int generic_setlease(struct file *filp, long arg, struct file_lock **flp)
goto out;
}
error = 0;
if (arg == F_UNLCK)
goto out;
@@ -1442,15 +1436,11 @@ 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 +1504,24 @@ 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 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);
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);
error = fasync_helper(fd, filp, 1, &fl->fl_fasync);
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;
}