From 2dd58026d709fc77488f40fd379d066be2208dcc Mon Sep 17 00:00:00 2001 From: Qu Wenruo Date: Wed, 30 Oct 2024 11:25:48 +1030 Subject: [PATCH] btrfs: fix mount failure due to remount races [BUG] The following reproducer can cause btrfs mount to fail: dev="/dev/test/scratch1" mnt1="/mnt/test" mnt2="/mnt/scratch" mkfs.btrfs -f $dev mount $dev $mnt1 btrfs subvolume create $mnt1/subvol1 btrfs subvolume create $mnt1/subvol2 umount $mnt1 mount $dev $mnt1 -o subvol=subvol1 while mount -o remount,ro $mnt1; do mount -o remount,rw $mnt1; done & bg=$! while mount $dev $mnt2 -o subvol=subvol2; do umount $mnt2; done kill $bg wait umount -R $mnt1 umount -R $mnt2 The script will fail with the following error: mount: /mnt/scratch: /dev/mapper/test-scratch1 already mounted on /mnt/test. dmesg(1) may have more information after failed mount system call. umount: /mnt/test: target is busy. umount: /mnt/scratch/: not mounted And there is no kernel error message. [CAUSE] During the btrfs mount, to support mounting different subvolumes with different RO/RW flags, we have a small hack during the mount: Retry with matching RO flags if the initial mount fail with -EBUSY. The problem is, during that retry we do not hold any super block lock (s_umount), this meanings there can be a remount process changing the RO flags of the original fs super block. If so, we can have an EBUSY error during retry. And this time we treat any failure as an error, without any retry and cause the above EBUSY mount failure. [FIX] The current retry behavior is racy because we do not have a super block thus no way to hold s_umount to prevent the race with remount. Solve the root problem by allowing fc->sb_flags to mismatch from the sb->s_flags at btrfs_get_tree_super(). Then at the re-entry point btrfs_get_tree_subvol(), manually check the fc->s_flags against sb->s_flags, if it's a RO->RW mismatch, then reconfigure with s_umount lock hold. Fixes: f044b318675f ("btrfs: handle the ro->rw transition for mounting different subvolumes") Reported-by: Enno Gotthold Reported-by: Fabian Vogt [ Special thanks for the reproducer and early analyze pointing to btrfs ] Link: https://bugzilla.suse.com/show_bug.cgi?id=1231836 Signed-off-by: Qu Wenruo Signed-off-by: David Sterba --- fs/btrfs/super.c | 66 ++++++++++++++++++++---------------------------- 1 file changed, 27 insertions(+), 39 deletions(-) diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index d77cce8d633e73..d137ce2b5038a6 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -1885,18 +1885,21 @@ static int btrfs_get_tree_super(struct fs_context *fc) if (sb->s_root) { btrfs_close_devices(fs_devices); - if ((fc->sb_flags ^ sb->s_flags) & SB_RDONLY) - ret = -EBUSY; + /* + * At this stage we may have RO flag mismatch between + * fc->sb_flags and sb->s_flags. + * Caller should detect such mismatch and reconfigure + * with sb->s_umount rwsem hold if needed. + */ } else { snprintf(sb->s_id, sizeof(sb->s_id), "%pg", bdev); shrinker_debugfs_rename(sb->s_shrink, "sb-btrfs:%s", sb->s_id); btrfs_sb(sb)->bdev_holder = &btrfs_fs_type; ret = btrfs_fill_super(sb, fs_devices); - } - - if (ret) { - deactivate_locked_super(sb); - return ret; + if (ret) { + deactivate_locked_super(sb); + return ret; + } } btrfs_clear_oneshot_options(fs_info); @@ -1983,39 +1986,18 @@ static int btrfs_get_tree_super(struct fs_context *fc) * * So here we always needs the remount hack to support per-subvolume RO/RW flags. */ -static struct vfsmount *btrfs_reconfigure_for_mount(struct fs_context *fc) +static int btrfs_reconfigure_for_mount(struct fs_context *fc, struct vfsmount *mnt) { - struct vfsmount *mnt; - int ret; - const bool ro2rw = !(fc->sb_flags & SB_RDONLY); - - /* - * We got an EBUSY because our SB_RDONLY flag didn't match the existing - * super block, so invert our setting here and retry the mount so we - * can get our vfsmount. - */ - if (ro2rw) - fc->sb_flags |= SB_RDONLY; - else - fc->sb_flags &= ~SB_RDONLY; - - mnt = fc_mount(fc); - if (IS_ERR(mnt)) - return mnt; + int ret = 0; - if (!ro2rw) - return mnt; + if (fc->sb_flags & SB_RDONLY) + return ret; - /* We need to convert to rw, call reconfigure. */ - fc->sb_flags &= ~SB_RDONLY; down_write(&mnt->mnt_sb->s_umount); - ret = btrfs_reconfigure(fc); + if (!(fc->sb_flags & SB_RDONLY) && (mnt->mnt_sb->s_flags & SB_RDONLY)) + ret = btrfs_reconfigure(fc); up_write(&mnt->mnt_sb->s_umount); - if (ret) { - mntput(mnt); - return ERR_PTR(ret); - } - return mnt; + return ret; } static int btrfs_get_tree_subvol(struct fs_context *fc) @@ -2025,6 +2007,7 @@ static int btrfs_get_tree_subvol(struct fs_context *fc) struct fs_context *dup_fc; struct dentry *dentry; struct vfsmount *mnt; + int ret = 0; /* * Setup a dummy root and fs_info for test/set super. This is because @@ -2067,11 +2050,16 @@ static int btrfs_get_tree_subvol(struct fs_context *fc) fc->security = NULL; mnt = fc_mount(dup_fc); - if (PTR_ERR_OR_ZERO(mnt) == -EBUSY) - mnt = btrfs_reconfigure_for_mount(dup_fc); - put_fs_context(dup_fc); - if (IS_ERR(mnt)) + if (IS_ERR(mnt)) { + put_fs_context(dup_fc); return PTR_ERR(mnt); + } + ret = btrfs_reconfigure_for_mount(dup_fc, mnt); + put_fs_context(dup_fc); + if (ret) { + mntput(mnt); + return ret; + } /* * This free's ->subvol_name, because if it isn't set we have to