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btrfs: Add noinode_cache mount option 

Add noinode_cache mount option for btrfs.

Since inode map cache involves all the btrfs_find_free_ino/return_ino
things and if just trigger the mount_opt,
an inode number get from inode map cache will not returned to inode map
cache.

To keep the find and return inode both in the same behavior,
a new bit in mount_opt, CHANGE_INODE_CACHE, is introduced for this idea.
CHANGE_INODE_CACHE is set/cleared in remounting, and the original
INODE_MAP_CACHE is set/cleared according to CHANGE_INODE_CACHE after a
success transaction.
Since find/return inode is all done between btrfs_start_transaction and
btrfs_commit_transaction, this will keep consistent behavior.

Also noinode_cache mount option will not stop the caching_kthread.

Cc: David Sterba <dsterba@suse.cz>
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Qu Wenruo 2014-01-13 13:36:06 +08:00 committed by Chris Mason
parent ade2e0b3ee
commit 3818aea275
4 changed files with 22 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
fs/btrfs/ctree.h
View File

@ -2023,6 +2023,7 @@ struct btrfs_ioctl_defrag_range_args {
#define BTRFS_MOUNT_CHECK_INTEGRITY_INCLUDING_EXTENT_DATA (1 << 21)
#define BTRFS_MOUNT_PANIC_ON_FATAL_ERROR (1 << 22)
#define BTRFS_MOUNT_RESCAN_UUID_TREE (1 << 23)
#define BTRFS_MOUNT_CHANGE_INODE_CACHE (1 << 24)
#define BTRFS_DEFAULT_COMMIT_INTERVAL (30)

4
fs/btrfs/disk-io.c
View File

@ -2776,6 +2776,10 @@ retry_root_backup:
btrfs_set_opt(fs_info->mount_opt, SSD);
}
/* Set the real inode map cache flag */
if (btrfs_test_opt(tree_root, CHANGE_INODE_CACHE))
btrfs_set_opt(tree_root->fs_info->mount_opt, INODE_MAP_CACHE);
#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
if (btrfs_test_opt(tree_root, CHECK_INTEGRITY)) {
ret = btrfsic_mount(tree_root, fs_devices,

10
fs/btrfs/super.c
View File

@ -327,7 +327,7 @@ enum {
Opt_check_integrity_print_mask, Opt_fatal_errors, Opt_rescan_uuid_tree,
Opt_commit_interval, Opt_barrier, Opt_nodefrag, Opt_nodiscard,
Opt_noenospc_debug, Opt_noflushoncommit, Opt_acl, Opt_datacow,
Opt_datasum, Opt_treelog,
Opt_datasum, Opt_treelog, Opt_noinode_cache,
Opt_err,
};
@ -370,6 +370,7 @@ static match_table_t tokens = {
{Opt_defrag, "autodefrag"},
{Opt_nodefrag, "noautodefrag"},
{Opt_inode_cache, "inode_cache"},
{Opt_noinode_cache, "noinode_cache"},
{Opt_no_space_cache, "nospace_cache"},
{Opt_recovery, "recovery"},
{Opt_skip_balance, "skip_balance"},
@ -627,7 +628,12 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
break;
case Opt_inode_cache:
btrfs_info(root->fs_info, "enabling inode map caching");
btrfs_set_opt(info->mount_opt, INODE_MAP_CACHE);
btrfs_set_opt(info->mount_opt, CHANGE_INODE_CACHE);
break;
case Opt_noinode_cache:
if (btrfs_test_opt(root, CHANGE_INODE_CACHE))
btrfs_info(root->fs_info, "disabling inode map caching");
btrfs_clear_opt(info->mount_opt, CHANGE_INODE_CACHE);
break;
case Opt_clear_cache:
btrfs_info(root->fs_info, "force clearing of disk cache");

9
fs/btrfs/transaction.c
View File

@ -1826,6 +1826,15 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
goto cleanup_transaction;
}
/*
* Since the transaction is done, we should set the inode map cache flag
* before any other comming transaction.
*/
if (btrfs_test_opt(root, CHANGE_INODE_CACHE))
btrfs_set_opt(root->fs_info->mount_opt, INODE_MAP_CACHE);
else
btrfs_clear_opt(root->fs_info->mount_opt, INODE_MAP_CACHE);
/* commit_fs_roots gets rid of all the tree log roots, it is now
* safe to free the root of tree log roots
*/