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authorLinus Torvalds <torvalds@linux-foundation.org>2014-04-12 01:16:53 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2014-04-12 01:16:53 +0400
commit3123bca71993c2346a458875488863772c1d5dc4 (patch)
treea1e082130a3d7a4ba1faaea60e699939cf821ab6 /fs/btrfs/super.c
parent582076ab16779208e7eb6ce712a9c0a6cc5bafe4 (diff)
parente4fbaee29272533a242f117d18712e2974520d2c (diff)
downloadlinux-3123bca71993c2346a458875488863772c1d5dc4.tar.xz
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs
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 ...
Diffstat (limited to 'fs/btrfs/super.c')
-rw-r--r--fs/btrfs/super.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 9dbf42395153..5011aadacab8 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -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);