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Btrfs: add mount -o inode_cache

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This makes the inode map cache default to off until we
fix the overflow problem when the free space crcs don't fit
inside a single page.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2011-06-03 09:36:29 -04:00
parent e7786c3ae5
commit 4b9465cb9e
4 changed files with 34 additions and 1 deletions
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20
fs/btrfs/inode-map.c
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@@ -38,6 +38,9 @@ static int caching_kthread(void *data)
int slot;
int ret;
if (!btrfs_test_opt(root, INODE_MAP_CACHE))
return 0;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
@@ -141,6 +144,9 @@ static void start_caching(struct btrfs_root *root)
int ret;
u64 objectid;
if (!btrfs_test_opt(root, INODE_MAP_CACHE))
return;
spin_lock(&root->cache_lock);
if (root->cached != BTRFS_CACHE_NO) {
spin_unlock(&root->cache_lock);
@@ -178,6 +184,9 @@ static void start_caching(struct btrfs_root *root)
int btrfs_find_free_ino(struct btrfs_root *root, u64 *objectid)
{
if (!btrfs_test_opt(root, INODE_MAP_CACHE))
return btrfs_find_free_objectid(root, objectid);
again:
*objectid = btrfs_find_ino_for_alloc(root);
@@ -201,6 +210,10 @@ void btrfs_return_ino(struct btrfs_root *root, u64 objectid)
{
struct btrfs_free_space_ctl *ctl = root->free_ino_ctl;
struct btrfs_free_space_ctl *pinned = root->free_ino_pinned;
if (!btrfs_test_opt(root, INODE_MAP_CACHE))
return;
again:
if (root->cached == BTRFS_CACHE_FINISHED) {
__btrfs_add_free_space(ctl, objectid, 1);
@@ -250,6 +263,9 @@ void btrfs_unpin_free_ino(struct btrfs_root *root)
struct rb_node *n;
u64 count;
if (!btrfs_test_opt(root, INODE_MAP_CACHE))
return;
while (1) {
n = rb_first(rbroot);
if (!n)
@@ -399,9 +415,13 @@ int btrfs_save_ino_cache(struct btrfs_root *root,
root != root->fs_info->tree_root)
return 0;
if (!btrfs_test_opt(root, INODE_MAP_CACHE))
return 0;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
again:
inode = lookup_free_ino_inode(root, path);
if (IS_ERR(inode) && PTR_ERR(inode) != -ENOENT) {