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Btrfs: fix wrong send_in_progress accounting 

Steps to reproduce:
 # mkfs.btrfs -f /dev/sda8
 # mount /dev/sda8 /mnt
 # btrfs sub snapshot -r /mnt /mnt/snap1
 # btrfs sub snapshot -r /mnt /mnt/snap2
 # btrfs send /mnt/snap1 -p /mnt/snap2 -f /mnt/1
 # dmesg

The problem is that we will sort clone roots(include @send_root), it
might push @send_root before thus @send_root's @send_in_progress will
be decreased twice.

Cc: David Sterba <dsterba@suse.cz>
Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Wang Shilong 2014-01-07 17:25:18 +08:00 committed by Chris Mason
parent a88998f291
commit 896c14f97f
1 changed files with 13 additions and 3 deletions
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16
fs/btrfs/send.c
View File

@ -4752,6 +4752,7 @@ long btrfs_ioctl_send(struct file *mnt_file, void __user *arg_)
u32 i;
u64 *clone_sources_tmp = NULL;
int clone_sources_to_rollback = 0;
int sort_clone_roots = 0;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
@ -4942,6 +4943,7 @@ long btrfs_ioctl_send(struct file *mnt_file, void __user *arg_)
sort(sctx->clone_roots, sctx->clone_roots_cnt,
sizeof(*sctx->clone_roots), __clone_root_cmp_sort,
NULL);
sort_clone_roots = 1;
ret = send_subvol(sctx);
if (ret < 0)
@ -4957,11 +4959,19 @@ long btrfs_ioctl_send(struct file *mnt_file, void __user *arg_)
}
out:
for (i = 0; sctx && i < clone_sources_to_rollback; i++)
btrfs_root_dec_send_in_progress(sctx->clone_roots[i].root);
if (sort_clone_roots) {
for (i = 0; i < sctx->clone_roots_cnt; i++)
btrfs_root_dec_send_in_progress(
sctx->clone_roots[i].root);
} else {
for (i = 0; sctx && i < clone_sources_to_rollback; i++)
btrfs_root_dec_send_in_progress(
sctx->clone_roots[i].root);
btrfs_root_dec_send_in_progress(send_root);
}
if (sctx && !IS_ERR_OR_NULL(sctx->parent_root))
btrfs_root_dec_send_in_progress(sctx->parent_root);
btrfs_root_dec_send_in_progress(send_root);
kfree(arg);
vfree(clone_sources_tmp);