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Btrfs: leave spinning on lookup and map the leaf

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On lookup we only want to read the inode item, so leave the path spinning.  Also
we're just wholesale reading the leaf off, so map the leaf so we don't do a
bunch of kmap/kunmaps.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
This commit is contained in:
Josef Bacik
2011-05-17 09:50:54 -04:00
parent 207dde8289
commit d90c732122
1 changed files with 12 additions and 0 deletions
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12
fs/btrfs/inode.c
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@@ -2493,6 +2493,7 @@ static void btrfs_read_locked_inode(struct inode *inode)
path = btrfs_alloc_path(); path = btrfs_alloc_path();
BUG_ON(!path); BUG_ON(!path);
path->leave_spinning = 1;
memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
ret = btrfs_lookup_inode(NULL, root, path, &location, 0); ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
@@ -2502,6 +2503,12 @@ static void btrfs_read_locked_inode(struct inode *inode)
leaf = path->nodes[0]; leaf = path->nodes[0];
inode_item = btrfs_item_ptr(leaf, path->slots[0], inode_item = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_inode_item); struct btrfs_inode_item);
if (!leaf->map_token)
map_private_extent_buffer(leaf, (unsigned long)inode_item,
sizeof(struct btrfs_inode_item),
&leaf->map_token, &leaf->kaddr,
&leaf->map_start, &leaf->map_len,
KM_USER1);
inode->i_mode = btrfs_inode_mode(leaf, inode_item); inode->i_mode = btrfs_inode_mode(leaf, inode_item);
inode->i_nlink = btrfs_inode_nlink(leaf, inode_item); inode->i_nlink = btrfs_inode_nlink(leaf, inode_item);
@@ -2539,6 +2546,11 @@ static void btrfs_read_locked_inode(struct inode *inode)
if (!maybe_acls) if (!maybe_acls)
cache_no_acl(inode); cache_no_acl(inode);
if (leaf->map_token) {
unmap_extent_buffer(leaf, leaf->map_token, KM_USER1);
leaf->map_token = NULL;
}
btrfs_free_path(path); btrfs_free_path(path);
inode_item = NULL; inode_item = NULL;