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alistair23-linux/fs/btrfs/tree-log.h

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Btrfs: Add a write ahead tree log to optimize synchronous operations File syncs and directory syncs are optimized by copying their items into a special (copy-on-write) log tree. There is one log tree per subvolume and the btrfs super block points to a tree of log tree roots. After a crash, items are copied out of the log tree and back into the subvolume. See tree-log.c for all the details. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-05 14:13:11 -06:00
/*
* Copyright (C) 2008 Oracle. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License v2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
#ifndef __TREE_LOG_
#define __TREE_LOG_
Btrfs: use helpers for last_trans_log_full_commit instead of opencode Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
2014-04-02 05:51:06 -06:00
#include "ctree.h"
#include "transaction.h"
Btrfs: avoid tree log commit when there are no changes rpm has a habit of running fdatasync when the file hasn't changed. We already detect if a file hasn't been changed in the current transaction but it might have been sent to the tree-log in this transaction and not changed since the last call to fsync. In this case, we want to avoid a tree log sync, which includes a number of synchronous writes and barriers. This commit extends the existing tracking of the last transaction to change a file to also track the last sub-transaction. The end result is that rpm -ivh and -Uvh are roughly twice as fast, and on par with ext3. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-10-13 11:21:08 -06:00
/* return value for btrfs_log_dentry_safe that means we don't need to log it at all */
#define BTRFS_NO_LOG_SYNC 256
Btrfs: fix skipped error handle when log sync failed It is possible that many tasks sync the log tree at the same time, but only one task can do the sync work, the others will wait for it. But those wait tasks didn't get the result of the log sync, and returned 0 when they ended the wait. It caused those tasks skipped the error handle, and the serious problem was they told the users the file sync succeeded but in fact they failed. This patch fixes this problem by introducing a log context structure, we insert it into the a global list. When the sync fails, we will set the error number of every log context in the list, then the waiting tasks get the error number of the log context and handle the error if need. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fb.com>
2014-02-20 03:08:58 -07:00
struct btrfs_log_ctx {
int log_ret;
Btrfs: just wait or commit our own log sub-transaction We might commit the log sub-transaction which didn't contain the metadata we logged. It was because we didn't record the log transid and just select the current log sub-transaction to commit, but the right one might be committed by the other task already. Actually, we needn't do anything and it is safe that we go back directly in this case. This patch improves the log sync by the above idea. We record the transid of the log sub-transaction in which we log the metadata, and the transid of the log sub-transaction we have committed. If the committed transid is >= the transid we record when logging the metadata, we just go back. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fb.com>
2014-02-20 03:08:59 -07:00
int log_transid;
Btrfs: fix data corruption after fast fsync and writeback error When we do a fast fsync, we start all ordered operations and then while they're running in parallel we visit the list of modified extent maps and construct their matching file extent items and write them to the log btree. After that, in btrfs_sync_log() we wait for all the ordered operations to finish (via btrfs_wait_logged_extents). The problem with this is that we were completely ignoring errors that can happen in the extent write path, such as -ENOSPC, a temporary -ENOMEM or -EIO errors for example. When such error happens, it means we have parts of the on disk extent that weren't written to, and so we end up logging file extent items that point to these extents that contain garbage/random data - so after a crash/reboot plus log replay, we get our inode's metadata pointing to those extents. This worked in contrast with the full (non-fast) fsync path, where we start all ordered operations, wait for them to finish and then write to the log btree. In this path, after each ordered operation completes we check if it's flagged with an error (BTRFS_ORDERED_IOERR) and return -EIO if so (via btrfs_wait_ordered_range). So if an error happens with any ordered operation, just return a -EIO error to userspace, so that it knows that not all of its previous writes were durably persisted and the application can take proper action (like redo the writes for e.g.) - and definitely not leave any file extent items in the log refer to non fully written extents. Signed-off-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Chris Mason <clm@fb.com>
2014-09-05 08:14:39 -06:00
int io_err;
Btrfs: fix skipped error handle when log sync failed It is possible that many tasks sync the log tree at the same time, but only one task can do the sync work, the others will wait for it. But those wait tasks didn't get the result of the log sync, and returned 0 when they ended the wait. It caused those tasks skipped the error handle, and the serious problem was they told the users the file sync succeeded but in fact they failed. This patch fixes this problem by introducing a log context structure, we insert it into the a global list. When the sync fails, we will set the error number of every log context in the list, then the waiting tasks get the error number of the log context and handle the error if need. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fb.com>
2014-02-20 03:08:58 -07:00
struct list_head list;
};
static inline void btrfs_init_log_ctx(struct btrfs_log_ctx *ctx)
{
ctx->log_ret = 0;
Btrfs: just wait or commit our own log sub-transaction We might commit the log sub-transaction which didn't contain the metadata we logged. It was because we didn't record the log transid and just select the current log sub-transaction to commit, but the right one might be committed by the other task already. Actually, we needn't do anything and it is safe that we go back directly in this case. This patch improves the log sync by the above idea. We record the transid of the log sub-transaction in which we log the metadata, and the transid of the log sub-transaction we have committed. If the committed transid is >= the transid we record when logging the metadata, we just go back. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fb.com>
2014-02-20 03:08:59 -07:00
ctx->log_transid = 0;
Btrfs: fix data corruption after fast fsync and writeback error When we do a fast fsync, we start all ordered operations and then while they're running in parallel we visit the list of modified extent maps and construct their matching file extent items and write them to the log btree. After that, in btrfs_sync_log() we wait for all the ordered operations to finish (via btrfs_wait_logged_extents). The problem with this is that we were completely ignoring errors that can happen in the extent write path, such as -ENOSPC, a temporary -ENOMEM or -EIO errors for example. When such error happens, it means we have parts of the on disk extent that weren't written to, and so we end up logging file extent items that point to these extents that contain garbage/random data - so after a crash/reboot plus log replay, we get our inode's metadata pointing to those extents. This worked in contrast with the full (non-fast) fsync path, where we start all ordered operations, wait for them to finish and then write to the log btree. In this path, after each ordered operation completes we check if it's flagged with an error (BTRFS_ORDERED_IOERR) and return -EIO if so (via btrfs_wait_ordered_range). So if an error happens with any ordered operation, just return a -EIO error to userspace, so that it knows that not all of its previous writes were durably persisted and the application can take proper action (like redo the writes for e.g.) - and definitely not leave any file extent items in the log refer to non fully written extents. Signed-off-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Chris Mason <clm@fb.com>
2014-09-05 08:14:39 -06:00
ctx->io_err = 0;
Btrfs: fix skipped error handle when log sync failed It is possible that many tasks sync the log tree at the same time, but only one task can do the sync work, the others will wait for it. But those wait tasks didn't get the result of the log sync, and returned 0 when they ended the wait. It caused those tasks skipped the error handle, and the serious problem was they told the users the file sync succeeded but in fact they failed. This patch fixes this problem by introducing a log context structure, we insert it into the a global list. When the sync fails, we will set the error number of every log context in the list, then the waiting tasks get the error number of the log context and handle the error if need. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fb.com>
2014-02-20 03:08:58 -07:00
INIT_LIST_HEAD(&ctx->list);
}
Btrfs: use helpers for last_trans_log_full_commit instead of opencode Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
2014-04-02 05:51:06 -06:00
static inline void btrfs_set_log_full_commit(struct btrfs_fs_info *fs_info,
struct btrfs_trans_handle *trans)
{
ACCESS_ONCE(fs_info->last_trans_log_full_commit) = trans->transid;
}
static inline int btrfs_need_log_full_commit(struct btrfs_fs_info *fs_info,
struct btrfs_trans_handle *trans)
{
return ACCESS_ONCE(fs_info->last_trans_log_full_commit) ==
trans->transid;
}
Btrfs: Add a write ahead tree log to optimize synchronous operations File syncs and directory syncs are optimized by copying their items into a special (copy-on-write) log tree. There is one log tree per subvolume and the btrfs super block points to a tree of log tree roots. After a crash, items are copied out of the log tree and back into the subvolume. See tree-log.c for all the details. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-05 14:13:11 -06:00
int btrfs_sync_log(struct btrfs_trans_handle *trans,
Btrfs: fix skipped error handle when log sync failed It is possible that many tasks sync the log tree at the same time, but only one task can do the sync work, the others will wait for it. But those wait tasks didn't get the result of the log sync, and returned 0 when they ended the wait. It caused those tasks skipped the error handle, and the serious problem was they told the users the file sync succeeded but in fact they failed. This patch fixes this problem by introducing a log context structure, we insert it into the a global list. When the sync fails, we will set the error number of every log context in the list, then the waiting tasks get the error number of the log context and handle the error if need. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fb.com>
2014-02-20 03:08:58 -07:00
struct btrfs_root *root, struct btrfs_log_ctx *ctx);
Btrfs: Add a write ahead tree log to optimize synchronous operations File syncs and directory syncs are optimized by copying their items into a special (copy-on-write) log tree. There is one log tree per subvolume and the btrfs super block points to a tree of log tree roots. After a crash, items are copied out of the log tree and back into the subvolume. See tree-log.c for all the details. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-05 14:13:11 -06:00
int btrfs_free_log(struct btrfs_trans_handle *trans, struct btrfs_root *root);
Btrfs: Metadata ENOSPC handling for tree log Previous patches make the allocater return -ENOSPC if there is no unreserved free metadata space. This patch updates tree log code and various other places to propagate/handle the ENOSPC error. Signed-off-by: Yan Zheng <zheng.yan@oracle.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
2010-05-16 08:49:59 -06:00
int btrfs_free_log_root_tree(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info);
Btrfs: Add a write ahead tree log to optimize synchronous operations File syncs and directory syncs are optimized by copying their items into a special (copy-on-write) log tree. There is one log tree per subvolume and the btrfs super block points to a tree of log tree roots. After a crash, items are copied out of the log tree and back into the subvolume. See tree-log.c for all the details. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-05 14:13:11 -06:00
int btrfs_recover_log_trees(struct btrfs_root *tree_root);
int btrfs_log_dentry_safe(struct btrfs_trans_handle *trans,
Btrfs: fix skipped error handle when log sync failed It is possible that many tasks sync the log tree at the same time, but only one task can do the sync work, the others will wait for it. But those wait tasks didn't get the result of the log sync, and returned 0 when they ended the wait. It caused those tasks skipped the error handle, and the serious problem was they told the users the file sync succeeded but in fact they failed. This patch fixes this problem by introducing a log context structure, we insert it into the a global list. When the sync fails, we will set the error number of every log context in the list, then the waiting tasks get the error number of the log context and handle the error if need. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fb.com>
2014-02-20 03:08:58 -07:00
struct btrfs_root *root, struct dentry *dentry,
Btrfs: fix fsync data loss after a ranged fsync While we're doing a full fsync (when the inode has the flag BTRFS_INODE_NEEDS_FULL_SYNC set) that is ranged too (covers only a portion of the file), we might have ordered operations that are started before or while we're logging the inode and that fall outside the fsync range. Therefore when a full ranged fsync finishes don't remove every extent map from the list of modified extent maps - as for some of them, that fall outside our fsync range, their respective ordered operation hasn't finished yet, meaning the corresponding file extent item wasn't inserted into the fs/subvol tree yet and therefore we didn't log it, and we must let the next fast fsync (one that checks only the modified list) see this extent map and log a matching file extent item to the log btree and wait for its ordered operation to finish (if it's still ongoing). A test case for xfstests follows. Signed-off-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Chris Mason <clm@fb.com>
2014-09-06 15:34:39 -06:00
const loff_t start,
const loff_t end,
Btrfs: fix skipped error handle when log sync failed It is possible that many tasks sync the log tree at the same time, but only one task can do the sync work, the others will wait for it. But those wait tasks didn't get the result of the log sync, and returned 0 when they ended the wait. It caused those tasks skipped the error handle, and the serious problem was they told the users the file sync succeeded but in fact they failed. This patch fixes this problem by introducing a log context structure, we insert it into the a global list. When the sync fails, we will set the error number of every log context in the list, then the waiting tasks get the error number of the log context and handle the error if need. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fb.com>
2014-02-20 03:08:58 -07:00
struct btrfs_log_ctx *ctx);
Btrfs: Add a write ahead tree log to optimize synchronous operations File syncs and directory syncs are optimized by copying their items into a special (copy-on-write) log tree. There is one log tree per subvolume and the btrfs super block points to a tree of log tree roots. After a crash, items are copied out of the log tree and back into the subvolume. See tree-log.c for all the details. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-05 14:13:11 -06:00
int btrfs_del_dir_entries_in_log(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
const char *name, int name_len,
struct inode *dir, u64 index);
int btrfs_del_inode_ref_in_log(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
const char *name, int name_len,
struct inode *inode, u64 dirid);
btrfs: return void in functions without error conditions Signed-off-by: Jeff Mahoney <jeffm@suse.com>
2012-03-01 06:56:26 -07:00
void btrfs_end_log_trans(struct btrfs_root *root);
Btrfs: tree logging unlink/rename fixes The tree logging code allows individual files or directories to be logged without including operations on other files and directories in the FS. It tries to commit the minimal set of changes to disk in order to fsync the single file or directory that was sent to fsync or O_SYNC. The tree logging code was allowing files and directories to be unlinked if they were part of a rename operation where only one directory in the rename was in the fsync log. This patch adds a few new rules to the tree logging. 1) on rename or unlink, if the inode being unlinked isn't in the fsync log, we must force a full commit before doing an fsync of the directory where the unlink was done. The commit isn't done during the unlink, but it is forced the next time we try to log the parent directory. Solution: record transid of last unlink/rename per directory when the directory wasn't already logged. For renames this is only done when renaming to a different directory. mkdir foo/some_dir normal commit rename foo/some_dir foo2/some_dir mkdir foo/some_dir fsync foo/some_dir/some_file The fsync above will unlink the original some_dir without recording it in its new location (foo2). After a crash, some_dir will be gone unless the fsync of some_file forces a full commit 2) we must log any new names for any file or dir that is in the fsync log. This way we make sure not to lose files that are unlinked during the same transaction. 2a) we must log any new names for any file or dir during rename when the directory they are being removed from was logged. 2a is actually the more important variant. Without the extra logging a crash might unlink the old name without recreating the new one 3) after a crash, we must go through any directories with a link count of zero and redo the rm -rf mkdir f1/foo normal commit rm -rf f1/foo fsync(f1) The directory f1 was fully removed from the FS, but fsync was never called on f1, only its parent dir. After a crash the rm -rf must be replayed. This must be able to recurse down the entire directory tree. The inode link count fixup code takes care of the ugly details. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-03-24 08:24:20 -06:00
int btrfs_pin_log_trans(struct btrfs_root *root);
void btrfs_record_unlink_dir(struct btrfs_trans_handle *trans,
struct inode *dir, struct inode *inode,
int for_rename);
int btrfs_log_new_name(struct btrfs_trans_handle *trans,
struct inode *inode, struct inode *old_dir,
struct dentry *parent);
Btrfs: Add a write ahead tree log to optimize synchronous operations File syncs and directory syncs are optimized by copying their items into a special (copy-on-write) log tree. There is one log tree per subvolume and the btrfs super block points to a tree of log tree roots. After a crash, items are copied out of the log tree and back into the subvolume. See tree-log.c for all the details. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-05 14:13:11 -06:00
#endif
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