Add noinode_cache mount option to disable inode map cache with
remount option.
Signed-off-by: Qu Wenruo <quwen...@cn.fujitsu.com>
---
changelog:
v2: Add noinode_cache mount option.
---
Documentation/filesystems/btrfs.txt | 6 ++++--
fs/btrfs/super.c | 7 +++++++
2 files changed, 11 insertions(+), 2 deletions(-)
diff --git a/Documentation/filesystems/btrfs.txt
b/Documentation/filesystems/btrfs.txt
index 516ed65..ffb40f3 100644
--- a/Documentation/filesystems/btrfs.txt
+++ b/Documentation/filesystems/btrfs.txt
@@ -129,9 +129,11 @@ Options with (*) are default options and will not show in
the mount options.
operations). This was previously the behavior only when a snapshot is
created.
+ noinode_cache(*)
inode_cache
- Enable free inode number caching. Defaults to off due to an overflow
- problem when the free space crcs don't fit inside a single page.
+ Disable/enable free inode number caching.
+ Defaults to off due to an overflow problem when the free space crcs
+ don't fit inside a single page.
max_inline=<bytes>
Specify the maximum amount of space, in bytes, that can be inlined in
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index c511239..16da3d1 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -325,6 +325,7 @@ enum {
Opt_check_integrity_print_mask, Opt_fatal_errors, Opt_rescan_uuid_tree,
Opt_commit_interval, Opt_barrier, Opt_nodefrag, Opt_nocheck_integrity,
Opt_nodiscard, Opt_noenospc_debug, Opt_noflushoncommit,
+ Opt_noinode_cache,
Opt_err,
};
@@ -363,6 +364,7 @@ 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"},
@@ -602,6 +604,11 @@ int btrfs_parse_options(struct btrfs_root *root, char
*options)
btrfs_info(root->fs_info, "enabling inode map caching");
btrfs_set_opt(info->mount_opt, INODE_MAP_CACHE);
break;
+ case Opt_noinode_cache:
+ if (btrfs_test_opt(root, INODE_MAP_CACHE))
+ btrfs_info(root->fs_info, "disabling inode map
caching");
+ btrfs_clear_opt(info->mount_opt, INODE_MAP_CACHE);
+ break;
case Opt_clear_cache:
btrfs_info(root->fs_info, "force clearing of disk
cache");
btrfs_set_opt(info->mount_opt, CLEAR_CACHE);
--
1.8.5.2
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