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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs

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Pull second set of btrfs updates from Chris Mason:
 "The most important changes here are from Josef, fixing a btrfs
  regression in 3.14 that can cause corruptions in the extent allocation
  tree when snapshots are in use.

  Josef also fixed some deadlocks in send/recv and other assorted races
  when balance is running"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs: (23 commits)
  Btrfs: fix compile warnings on on avr32 platform
  btrfs: allow mounting btrfs subvolumes with different ro/rw options
  btrfs: export global block reserve size as space_info
  btrfs: fix crash in remount(thread_pool=) case
  Btrfs: abort the transaction when we don't find our extent ref
  Btrfs: fix EINVAL checks in btrfs_clone
  Btrfs: fix unlock in __start_delalloc_inodes()
  Btrfs: scrub raid56 stripes in the right way
  Btrfs: don't compress for a small write
  Btrfs: more efficient io tree navigation on wait_extent_bit
  Btrfs: send, build path string only once in send_hole
  btrfs: filter invalid arg for btrfs resize
  Btrfs: send, fix data corruption due to incorrect hole detection
  Btrfs: kmalloc() doesn't return an ERR_PTR
  Btrfs: fix snapshot vs nocow writting
  btrfs: Change the expanding write sequence to fix snapshot related bug.
  btrfs: make device scan less noisy
  btrfs: fix lockdep warning with reclaim lock inversion
  Btrfs: hold the commit_root_sem when getting the commit root during send
  Btrfs: remove transaction from send
  ...
This commit is contained in:
Linus Torvalds
2014-04-11 14:16:53 -07:00
parent 582076ab16 e4fbaee292
commit 3123bca719
19 changed files with 374 additions and 279 deletions
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22
fs/btrfs/super.c
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@@ -66,6 +66,8 @@
static const struct super_operations btrfs_super_ops;
static struct file_system_type btrfs_fs_type;
static int btrfs_remount(struct super_block *sb, int *flags, char *data);
static const char *btrfs_decode_error(int errno)
{
char *errstr = "unknown";
@@ -1185,6 +1187,26 @@ static struct dentry *mount_subvol(const char *subvol_name, int flags,
mnt = vfs_kern_mount(&btrfs_fs_type, flags, device_name,
newargs);
kfree(newargs);
if (PTR_RET(mnt) == -EBUSY) {
if (flags & MS_RDONLY) {
mnt = vfs_kern_mount(&btrfs_fs_type, flags & ~MS_RDONLY, device_name,
newargs);
} else {
int r;
mnt = vfs_kern_mount(&btrfs_fs_type, flags | MS_RDONLY, device_name,
newargs);
if (IS_ERR(mnt))
return ERR_CAST(mnt);
r = btrfs_remount(mnt->mnt_sb, &flags, NULL);
if (r < 0) {
/* FIXME: release vfsmount mnt ??*/
return ERR_PTR(r);
}
}
}
if (IS_ERR(mnt))
return ERR_CAST(mnt);