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btrfs: check balance of send_in_progress

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Warn if the balance goes below zero, which appears to be unlikely
though. Otherwise cleans up the code a bit.

Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
David Sterba 2013-12-17 15:07:20 +01:00 committed by Chris Mason
parent 41ce9970a8
commit 66ef7d65c3
1 changed files with 20 additions and 18 deletions
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38
fs/btrfs/send.c
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@ -4725,6 +4725,21 @@ static int send_subvol(struct send_ctx *sctx)
return ret;
}
static void btrfs_root_dec_send_in_progress(struct btrfs_root* root)
{
spin_lock(&root->root_item_lock);
root->send_in_progress--;
/*
* Not much left to do, we don't know why it's unbalanced and
* can't blindly reset it to 0.
*/
if (root->send_in_progress < 0)
btrfs_err(root->fs_info,
"send_in_progres unbalanced %d root %llu\n",
root->send_in_progress, root->root_key.objectid);
spin_unlock(&root->root_item_lock);
}
long btrfs_ioctl_send(struct file *mnt_file, void __user *arg_)
{
int ret = 0;
@ -4942,24 +4957,11 @@ long btrfs_ioctl_send(struct file *mnt_file, void __user *arg_)
}
out:
for (i = 0; sctx && i < clone_sources_to_rollback; i++) {
struct btrfs_root *r = sctx->clone_roots[i].root;
spin_lock(&r->root_item_lock);
r->send_in_progress--;
spin_unlock(&r->root_item_lock);
}
if (sctx && !IS_ERR_OR_NULL(sctx->parent_root)) {
struct btrfs_root *r = sctx->parent_root;
spin_lock(&r->root_item_lock);
r->send_in_progress--;
spin_unlock(&r->root_item_lock);
}
spin_lock(&send_root->root_item_lock);
send_root->send_in_progress--;
spin_unlock(&send_root->root_item_lock);
for (i = 0; sctx && i < clone_sources_to_rollback; i++)
btrfs_root_dec_send_in_progress(sctx->clone_roots[i].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);