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Btrfs: Change find_extent_buffer to use TestSetPageLocked 

This makes it possible for callers to check for extent_buffers in cache
without deadlocking against any btree locks held.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
hifive-unleashed-5.1
Chris Mason 2008-06-25 16:01:31 -04:00
parent e7a84565bc
commit 079899c238
2 changed files with 6 additions and 3 deletions
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2
fs/btrfs/extent-tree.c
View File

@ -1438,7 +1438,6 @@ static int pin_down_bytes(struct btrfs_root *root, u64 bytenr, u32 num_bytes,
int err = 0;
if (!pending) {
#if 0
struct extent_buffer *buf;
buf = btrfs_find_tree_block(root, bytenr, num_bytes);
if (buf) {
@ -1460,7 +1459,6 @@ static int pin_down_bytes(struct btrfs_root *root, u64 bytenr, u32 num_bytes,
}
free_extent_buffer(buf);
}
#endif
update_pinned_extents(root, bytenr, num_bytes, 1);
} else {
set_extent_bits(&root->fs_info->pending_del,

7
fs/btrfs/extent_io.c
View File

@ -2808,10 +2808,15 @@ struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
goto lru_add;
for (i = 0; i < num_pages; i++, index++) {
p = find_lock_page(mapping, index);
p = find_get_page(mapping, index);
if (!p) {
goto fail;
}
if (TestSetPageLocked(p)) {
page_cache_release(p);
goto fail;
}
set_page_extent_mapped(p);
mark_page_accessed(p);