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Diffstat (limited to 'fs/btrfs/file-item.c')
-rw-r--r--fs/btrfs/file-item.c50
1 files changed, 18 insertions, 32 deletions
diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c
index 90d4ee52cd45..a1cb7821becd 100644
--- a/fs/btrfs/file-item.c
+++ b/fs/btrfs/file-item.c
@@ -177,6 +177,17 @@ static int __btrfs_lookup_bio_sums(struct btrfs_root *root,
WARN_ON(bio->bi_vcnt <= 0);
+ /*
+ * the free space stuff is only read when it hasn't been
+ * updated in the current transaction. So, we can safely
+ * read from the commit root and sidestep a nasty deadlock
+ * between reading the free space cache and updating the csum tree.
+ */
+ if (btrfs_is_free_space_inode(root, inode)) {
+ path->search_commit_root = 1;
+ path->skip_locking = 1;
+ }
+
disk_bytenr = (u64)bio->bi_sector << 9;
if (dio)
offset = logical_offset;
@@ -282,7 +293,8 @@ int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
u16 csum_size = btrfs_super_csum_size(&root->fs_info->super_copy);
path = btrfs_alloc_path();
- BUG_ON(!path);
+ if (!path)
+ return -ENOMEM;
if (search_commit) {
path->skip_locking = 1;
@@ -664,15 +676,13 @@ int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
struct btrfs_sector_sum *sector_sum;
u32 nritems;
u32 ins_size;
- char *eb_map;
- char *eb_token;
- unsigned long map_len;
- unsigned long map_start;
u16 csum_size =
btrfs_super_csum_size(&root->fs_info->super_copy);
path = btrfs_alloc_path();
- BUG_ON(!path);
+ if (!path)
+ return -ENOMEM;
+
sector_sum = sums->sums;
again:
next_offset = (u64)-1;
@@ -814,30 +824,9 @@ found:
item_end = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
item_end = (struct btrfs_csum_item *)((unsigned char *)item_end +
btrfs_item_size_nr(leaf, path->slots[0]));
- eb_token = NULL;
next_sector:
- if (!eb_token ||
- (unsigned long)item + csum_size >= map_start + map_len) {
- int err;
-
- if (eb_token)
- unmap_extent_buffer(leaf, eb_token, KM_USER1);
- eb_token = NULL;
- err = map_private_extent_buffer(leaf, (unsigned long)item,
- csum_size,
- &eb_token, &eb_map,
- &map_start, &map_len, KM_USER1);
- if (err)
- eb_token = NULL;
- }
- if (eb_token) {
- memcpy(eb_token + ((unsigned long)item & (PAGE_CACHE_SIZE - 1)),
- &sector_sum->sum, csum_size);
- } else {
- write_extent_buffer(leaf, &sector_sum->sum,
- (unsigned long)item, csum_size);
- }
+ write_extent_buffer(leaf, &sector_sum->sum, (unsigned long)item, csum_size);
total_bytes += root->sectorsize;
sector_sum++;
@@ -850,10 +839,7 @@ next_sector:
goto next_sector;
}
}
- if (eb_token) {
- unmap_extent_buffer(leaf, eb_token, KM_USER1);
- eb_token = NULL;
- }
+
btrfs_mark_buffer_dirty(path->nodes[0]);
if (total_bytes < sums->len) {
btrfs_release_path(path);