pr_err("BTRFS: state leak: start %llu end %llu state %u in tree %d refs %d\n",
state->start, state->end, state->state,
extent_state_in_tree(state),
- atomic_read(&state->refs));
+ refcount_read(&state->refs));
list_del(&state->leak_list);
kmem_cache_free(extent_state_cache, state);
}
state->failrec = NULL;
RB_CLEAR_NODE(&state->rb_node);
btrfs_leak_debug_add(&state->leak_list, &states);
- atomic_set(&state->refs, 1);
+ refcount_set(&state->refs, 1);
init_waitqueue_head(&state->wq);
trace_alloc_extent_state(state, mask, _RET_IP_);
return state;
{
if (!state)
return;
- if (atomic_dec_and_test(&state->refs)) {
+ if (refcount_dec_and_test(&state->refs)) {
WARN_ON(extent_state_in_tree(state));
btrfs_leak_debug_del(&state->leak_list);
trace_free_extent_state(state, _RET_IP_);
if (cached && extent_state_in_tree(cached) &&
cached->start <= start && cached->end > start) {
if (clear)
- atomic_dec(&cached->refs);
+ refcount_dec(&cached->refs);
state = cached;
goto hit_next;
}
if (state->state & bits) {
start = state->start;
- atomic_inc(&state->refs);
+ refcount_inc(&state->refs);
wait_on_state(tree, state);
free_extent_state(state);
goto again;
if (cached_ptr && !(*cached_ptr)) {
if (!flags || (state->state & flags)) {
*cached_ptr = state;
- atomic_inc(&state->refs);
+ refcount_inc(&state->refs);
}
}
}
if (!found) {
*start = state->start;
*cached_state = state;
- atomic_inc(&state->refs);
+ refcount_inc(&state->refs);
}
found++;
*end = state->end;
u64 map_length = 0;
u64 sector;
struct btrfs_bio *bbio = NULL;
- struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree;
int ret;
ASSERT(!(fs_info->sb->s_flags & MS_RDONLY));
BUG_ON(!mirror_num);
- /* we can't repair anything in raid56 yet */
- if (btrfs_is_parity_mirror(map_tree, logical, length, mirror_num))
- return 0;
-
bio = btrfs_io_bio_alloc(GFP_NOFS, 1);
if (!bio)
return -EIO;
* read repair operation.
*/
btrfs_bio_counter_inc_blocked(fs_info);
- ret = btrfs_map_block(fs_info, BTRFS_MAP_WRITE, logical,
- &map_length, &bbio, mirror_num);
- if (ret) {
- btrfs_bio_counter_dec(fs_info);
- bio_put(bio);
- return -EIO;
+ if (btrfs_is_parity_mirror(fs_info, logical, length, mirror_num)) {
+ /*
+ * Note that we don't use BTRFS_MAP_WRITE because it's supposed
+ * to update all raid stripes, but here we just want to correct
+ * bad stripe, thus BTRFS_MAP_READ is abused to only get the bad
+ * stripe's dev and sector.
+ */
+ ret = btrfs_map_block(fs_info, BTRFS_MAP_READ, logical,
+ &map_length, &bbio, 0);
+ if (ret) {
+ btrfs_bio_counter_dec(fs_info);
+ bio_put(bio);
+ return -EIO;
+ }
+ ASSERT(bbio->mirror_num == 1);
+ } else {
+ ret = btrfs_map_block(fs_info, BTRFS_MAP_WRITE, logical,
+ &map_length, &bbio, mirror_num);
+ if (ret) {
+ btrfs_bio_counter_dec(fs_info);
+ bio_put(bio);
+ return -EIO;
+ }
+ BUG_ON(mirror_num != bbio->mirror_num);
}
- BUG_ON(mirror_num != bbio->mirror_num);
- sector = bbio->stripes[mirror_num-1].physical >> 9;
+
+ sector = bbio->stripes[bbio->mirror_num - 1].physical >> 9;
bio->bi_iter.bi_sector = sector;
- dev = bbio->stripes[mirror_num-1].dev;
+ dev = bbio->stripes[bbio->mirror_num - 1].dev;
btrfs_put_bbio(bbio);
if (!dev || !dev->bdev || !dev->writeable) {
btrfs_bio_counter_dec(fs_info);
if (!uptodate) {
ClearPageUptodate(page);
SetPageError(page);
- ret = ret < 0 ? ret : -EIO;
+ ret = err < 0 ? err : -EIO;
mapping_set_error(page->mapping, ret);
}
}
em = *em_cached;
if (extent_map_in_tree(em) && start >= em->start &&
start < extent_map_end(em)) {
- atomic_inc(&em->refs);
+ refcount_inc(&em->refs);
return em;
}
em = get_extent(BTRFS_I(inode), page, pg_offset, start, len, 0);
if (em_cached && !IS_ERR_OR_NULL(em)) {
BUG_ON(*em_cached);
- atomic_inc(&em->refs);
+ refcount_inc(&em->refs);
*em_cached = em;
}
return em;
return NULL;
}
+/*
+ * To cache previous fiemap extent
+ *
+ * Will be used for merging fiemap extent
+ */
+struct fiemap_cache {
+ u64 offset;
+ u64 phys;
+ u64 len;
+ u32 flags;
+ bool cached;
+};
+
+/*
+ * Helper to submit fiemap extent.
+ *
+ * Will try to merge current fiemap extent specified by @offset, @phys,
+ * @len and @flags with cached one.
+ * And only when we fails to merge, cached one will be submitted as
+ * fiemap extent.
+ *
+ * Return value is the same as fiemap_fill_next_extent().
+ */
+static int emit_fiemap_extent(struct fiemap_extent_info *fieinfo,
+ struct fiemap_cache *cache,
+ u64 offset, u64 phys, u64 len, u32 flags)
+{
+ int ret = 0;
+
+ if (!cache->cached)
+ goto assign;
+
+ /*
+ * Sanity check, extent_fiemap() should have ensured that new
+ * fiemap extent won't overlap with cahced one.
+ * Not recoverable.
+ *
+ * NOTE: Physical address can overlap, due to compression
+ */
+ if (cache->offset + cache->len > offset) {
+ WARN_ON(1);
+ return -EINVAL;
+ }
+
+ /*
+ * Only merges fiemap extents if
+ * 1) Their logical addresses are continuous
+ *
+ * 2) Their physical addresses are continuous
+ * So truly compressed (physical size smaller than logical size)
+ * extents won't get merged with each other
+ *
+ * 3) Share same flags except FIEMAP_EXTENT_LAST
+ * So regular extent won't get merged with prealloc extent
+ */
+ if (cache->offset + cache->len == offset &&
+ cache->phys + cache->len == phys &&
+ (cache->flags & ~FIEMAP_EXTENT_LAST) ==
+ (flags & ~FIEMAP_EXTENT_LAST)) {
+ cache->len += len;
+ cache->flags |= flags;
+ goto try_submit_last;
+ }
+
+ /* Not mergeable, need to submit cached one */
+ ret = fiemap_fill_next_extent(fieinfo, cache->offset, cache->phys,
+ cache->len, cache->flags);
+ cache->cached = false;
+ if (ret)
+ return ret;
+assign:
+ cache->cached = true;
+ cache->offset = offset;
+ cache->phys = phys;
+ cache->len = len;
+ cache->flags = flags;
+try_submit_last:
+ if (cache->flags & FIEMAP_EXTENT_LAST) {
+ ret = fiemap_fill_next_extent(fieinfo, cache->offset,
+ cache->phys, cache->len, cache->flags);
+ cache->cached = false;
+ }
+ return ret;
+}
+
+/*
+ * Sanity check for fiemap cache
+ *
+ * All fiemap cache should be submitted by emit_fiemap_extent()
+ * Iteration should be terminated either by last fiemap extent or
+ * fieinfo->fi_extents_max.
+ * So no cached fiemap should exist.
+ */
+static int check_fiemap_cache(struct btrfs_fs_info *fs_info,
+ struct fiemap_extent_info *fieinfo,
+ struct fiemap_cache *cache)
+{
+ int ret;
+
+ if (!cache->cached)
+ return 0;
+
+ /* Small and recoverbale problem, only to info developer */
+#ifdef CONFIG_BTRFS_DEBUG
+ WARN_ON(1);
+#endif
+ btrfs_warn(fs_info,
+ "unhandled fiemap cache detected: offset=%llu phys=%llu len=%llu flags=0x%x",
+ cache->offset, cache->phys, cache->len, cache->flags);
+ ret = fiemap_fill_next_extent(fieinfo, cache->offset, cache->phys,
+ cache->len, cache->flags);
+ cache->cached = false;
+ if (ret > 0)
+ ret = 0;
+ return ret;
+}
+
int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
__u64 start, __u64 len, get_extent_t *get_extent)
{
struct extent_state *cached_state = NULL;
struct btrfs_path *path;
struct btrfs_root *root = BTRFS_I(inode)->root;
+ struct fiemap_cache cache = { 0 };
int end = 0;
u64 em_start = 0;
u64 em_len = 0;
flags |= FIEMAP_EXTENT_LAST;
end = 1;
}
- ret = fiemap_fill_next_extent(fieinfo, em_start, disko,
- em_len, flags);
+ ret = emit_fiemap_extent(fieinfo, &cache, em_start, disko,
+ em_len, flags);
if (ret) {
if (ret == 1)
ret = 0;
}
}
out_free:
+ if (!ret)
+ ret = check_fiemap_cache(root->fs_info, fieinfo, &cache);
free_extent_map(em);
out:
btrfs_free_path(path);
projects / karo-tx-linux.git / blobdiff