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Merge branch 'work.lookups' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

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Pull parallel lookup fixups from Al Viro:
 "Fix for xfs parallel readdir (turns out the cxfs exposure was not
  enough to catch all problems), and a reversion of btrfs back to
  ->iterate() until the fs/btrfs/delayed-inode.c gets fixed"

* 'work.lookups' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  xfs: concurrent readdir hangs on data buffer locks
  Revert "btrfs: switch to ->iterate_shared()"
This commit is contained in:
Linus Torvalds 2016-05-18 10:28:45 -07:00
commit e34df3344d
2 changed files with 15 additions and 10 deletions
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2
fs/btrfs/inode.c
View File

@ -10181,7 +10181,7 @@ static const struct inode_operations btrfs_dir_ro_inode_operations = {
static const struct file_operations btrfs_dir_file_operations = {
.llseek = generic_file_llseek,
.read = generic_read_dir,
.iterate_shared = btrfs_real_readdir,
.iterate = btrfs_real_readdir,
.unlocked_ioctl = btrfs_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = btrfs_ioctl,

23
fs/xfs/xfs_dir2_readdir.c
View File

@ -273,10 +273,11 @@ xfs_dir2_leaf_readbuf(
size_t bufsize,
struct xfs_dir2_leaf_map_info *mip,
xfs_dir2_off_t *curoff,
struct xfs_buf **bpp)
struct xfs_buf **bpp,
bool trim_map)
{
struct xfs_inode *dp = args->dp;
struct xfs_buf *bp = *bpp;
struct xfs_buf *bp = NULL;
struct xfs_bmbt_irec *map = mip->map;
struct blk_plug plug;
int error = 0;
@ -286,13 +287,10 @@ xfs_dir2_leaf_readbuf(
struct xfs_da_geometry *geo = args->geo;
/*
* If we have a buffer, we need to release it and
* take it out of the mapping.
* If the caller just finished processing a buffer, it will tell us
* we need to trim that block out of the mapping now it is done.
*/
if (bp) {
xfs_trans_brelse(NULL, bp);
bp = NULL;
if (trim_map) {
mip->map_blocks -= geo->fsbcount;
/*
* Loop to get rid of the extents for the
@ -533,10 +531,17 @@ xfs_dir2_leaf_getdents(
*/
if (!bp || ptr >= (char *)bp->b_addr + geo->blksize) {
int lock_mode;
bool trim_map = false;
if (bp) {
xfs_trans_brelse(NULL, bp);
bp = NULL;
trim_map = true;
}
lock_mode = xfs_ilock_data_map_shared(dp);
error = xfs_dir2_leaf_readbuf(args, bufsize, map_info,
&curoff, &bp);
&curoff, &bp, trim_map);
xfs_iunlock(dp, lock_mode);
if (error || !map_info->map_valid)
break;