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btrfs: enhance transaction abort infrastructure

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Signed-off-by: Jeff Mahoney <jeffm@suse.com>
This commit is contained in:
Jeff Mahoney 2012-03-01 17:24:58 +01:00 • committed by David Sterba
parent 4da3511342
commit 49b25e0540
8 changed files with 300 additions and 56 deletions
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74
fs/btrfs/super.c
View file

@ -119,6 +119,8 @@ static void btrfs_handle_error(struct btrfs_fs_info *fs_info)
if (fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) {
sb->s_flags |= MS_RDONLY;
printk(KERN_INFO "btrfs is forced readonly\n");
__btrfs_scrub_cancel(fs_info);
// WARN_ON(1);
}
}
@ -197,6 +199,34 @@ void btrfs_printk(struct btrfs_fs_info *fs_info, const char *fmt, ...)
printk("%sBTRFS %s (device %s): %pV", lvl, type, sb->s_id, &vaf);
}
/*
* We only mark the transaction aborted and then set the file system read-only.
* This will prevent new transactions from starting or trying to join this
* one.
*
* This means that error recovery at the call site is limited to freeing
* any local memory allocations and passing the error code up without
* further cleanup. The transaction should complete as it normally would
* in the call path but will return -EIO.
*
* We'll complete the cleanup in btrfs_end_transaction and
* btrfs_commit_transaction.
*/
void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
struct btrfs_root *root, const char *function,
unsigned int line, int errno)
{
WARN_ON_ONCE(1);
trans->aborted = errno;
/* Nothing used. The other threads that have joined this
* transaction may be able to continue. */
if (!trans->blocks_used) {
btrfs_printk(root->fs_info, "Aborting unused transaction.\n");
return;
}
trans->transaction->aborted = errno;
__btrfs_std_error(root->fs_info, function, line, errno, NULL);
}
/*
* __btrfs_panic decodes unexpected, fatal errors from the caller,
* issues an alert, and either panics or BUGs, depending on mount options.
@ -295,6 +325,7 @@ static match_table_t tokens = {
/*
* Regular mount options parser. Everything that is needed only when
* reading in a new superblock is parsed here.
* XXX JDM: This needs to be cleaned up for remount.
*/
int btrfs_parse_options(struct btrfs_root *root, char *options)
{
@ -1096,11 +1127,20 @@ static int btrfs_remount(struct super_block *sb, int *flags, char *data)
{
struct btrfs_fs_info *fs_info = btrfs_sb(sb);
struct btrfs_root *root = fs_info->tree_root;
unsigned old_flags = sb->s_flags;
unsigned long old_opts = fs_info->mount_opt;
unsigned long old_compress_type = fs_info->compress_type;
u64 old_max_inline = fs_info->max_inline;
u64 old_alloc_start = fs_info->alloc_start;
int old_thread_pool_size = fs_info->thread_pool_size;
unsigned int old_metadata_ratio = fs_info->metadata_ratio;
int ret;
ret = btrfs_parse_options(root, data);
if (ret)
return -EINVAL;
if (ret) {
ret = -EINVAL;
goto restore;
}
if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
return 0;
@ -1108,26 +1148,44 @@ static int btrfs_remount(struct super_block *sb, int *flags, char *data)
if (*flags & MS_RDONLY) {
sb->s_flags |= MS_RDONLY;
ret = btrfs_commit_super(root);
WARN_ON(ret);
ret = btrfs_commit_super(root);
if (ret)
goto restore;
} else {
if (fs_info->fs_devices->rw_devices == 0)
return -EACCES;
ret = -EACCES;
goto restore;
if (btrfs_super_log_root(fs_info->super_copy) != 0)
return -EINVAL;
ret = -EINVAL;
goto restore;
ret = btrfs_cleanup_fs_roots(fs_info);
WARN_ON(ret);
if (ret)
goto restore;
/* recover relocation */
ret = btrfs_recover_relocation(root);
WARN_ON(ret);
if (ret)
goto restore;
sb->s_flags &= ~MS_RDONLY;
}
return 0;
restore:
/* We've hit an error - don't reset MS_RDONLY */
if (sb->s_flags & MS_RDONLY)
old_flags |= MS_RDONLY;
sb->s_flags = old_flags;
fs_info->mount_opt = old_opts;
fs_info->compress_type = old_compress_type;
fs_info->max_inline = old_max_inline;
fs_info->alloc_start = old_alloc_start;
fs_info->thread_pool_size = old_thread_pool_size;
fs_info->metadata_ratio = old_metadata_ratio;
return ret;
}
/* Used to sort the devices by max_avail(descending sort) */