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Btrfs: only log the inode item if we can get away with it 

Currently we copy all the file information into the log, inode item, the
refs, xattrs etc.  Except most of this doesn't change from fsync to fsync,
just the inode item changes.  So set a flag if an xattr changes or a link is
added, and otherwise only log the inode item.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
This commit is contained in:
Josef Bacik 2012-10-11 15:53:56 -04:00 committed by Chris Mason
parent 5f3ab90a72
commit e997615149
4 changed files with 11 additions and 2 deletions
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1
fs/btrfs/btrfs_inode.h
View File

@ -39,6 +39,7 @@
#define BTRFS_INODE_HAS_ORPHAN_ITEM 5
#define BTRFS_INODE_HAS_ASYNC_EXTENT 6
#define BTRFS_INODE_NEEDS_FULL_SYNC 7
#define BTRFS_INODE_COPY_EVERYTHING 8
/* in memory btrfs inode */
struct btrfs_inode {

1
fs/btrfs/inode.c
View File

@ -5083,6 +5083,7 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
inode_inc_iversion(inode);
inode->i_ctime = CURRENT_TIME;
ihold(inode);
set_bit(BTRFS_INODE_COPY_EVERYTHING, &BTRFS_I(inode)->runtime_flags);
err = btrfs_add_nondir(trans, dir, dentry, inode, 1, index);

10
fs/btrfs/tree-log.c
View File

@ -3429,14 +3429,20 @@ static int btrfs_log_inode(struct btrfs_trans_handle *trans,
} else {
if (test_and_clear_bit(BTRFS_INODE_NEEDS_FULL_SYNC,
&BTRFS_I(inode)->runtime_flags)) {
clear_bit(BTRFS_INODE_COPY_EVERYTHING,
&BTRFS_I(inode)->runtime_flags);
ret = btrfs_truncate_inode_items(trans, log,
inode, 0, 0);
} else {
if (inode_only == LOG_INODE_ALL)
fast_search = true;
max_key.type = BTRFS_XATTR_ITEM_KEY;
if (test_and_clear_bit(BTRFS_INODE_COPY_EVERYTHING,
&BTRFS_I(inode)->runtime_flags))
max_key.type = BTRFS_XATTR_ITEM_KEY;
else
max_key.type = BTRFS_INODE_ITEM_KEY;
ret = drop_objectid_items(trans, log, path, ino,
BTRFS_XATTR_ITEM_KEY);
max_key.type);
}
}
if (ret) {

1
fs/btrfs/xattr.c
View File

@ -208,6 +208,7 @@ int __btrfs_setxattr(struct btrfs_trans_handle *trans,
inode_inc_iversion(inode);
inode->i_ctime = CURRENT_TIME;
set_bit(BTRFS_INODE_COPY_EVERYTHING, &BTRFS_I(inode)->runtime_flags);
ret = btrfs_update_inode(trans, root, inode);
BUG_ON(ret);
out: