clear_extent_bit can fail with -ENOMEM for a specific case but will BUG
on other memory allocation failures.
This patch returns -ENOMEM for memory allocation failures and handles them
with BUG_ON in callers which don't handle it already.
Signed-off-by: Jeff Mahoney <jeffm@xxxxxxxx>
---
fs/btrfs/disk-io.c | 8 ++-
fs/btrfs/extent-tree.c | 14 ++++--
fs/btrfs/extent_io.c | 61 ++++++++++++++++++++--------
fs/btrfs/extent_io.h | 8 +--
fs/btrfs/file.c | 10 ++--
fs/btrfs/free-space-cache.c | 7 ++-
fs/btrfs/inode.c | 94 +++++++++++++++++++++++++++-----------------
fs/btrfs/ioctl.c | 9 ++--
fs/btrfs/relocation.c | 5 +-
fs/btrfs/transaction.c | 4 +
fs/btrfs/tree-log.c | 5 +-
11 files changed, 146 insertions(+), 79 deletions(-)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2981,7 +2981,10 @@ static int btrfs_destroy_marked_extents(
if (ret)
break;
- clear_extent_bits(dirty_pages, start, end, mark, GFP_NOFS);
+ ret = clear_extent_bits(dirty_pages, start, end, mark,
+ GFP_NOFS);
+ BUG_ON(ret < 0);
+ ret = 0;
while (start <= end) {
index = start >> PAGE_CACHE_SHIFT;
start = (u64)(index + 1) << PAGE_CACHE_SHIFT;
@@ -3042,7 +3045,8 @@ static int btrfs_destroy_pinned_extent(s
end + 1 - start,
NULL);
- clear_extent_dirty(unpin, start, end, GFP_NOFS);
+ ret = clear_extent_dirty(unpin, start, end, GFP_NOFS);
+ BUG_ON(ret < 0);
btrfs_error_unpin_extent_range(root, start, end);
cond_resched();
}
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -223,14 +223,17 @@ static void free_excluded_extents(struct
struct btrfs_block_group_cache *cache)
{
u64 start, end;
+ int ret;
start = cache->key.objectid;
end = start + cache->key.offset - 1;
- clear_extent_bits(&root->fs_info->freed_extents[0],
- start, end, EXTENT_UPTODATE, GFP_NOFS);
- clear_extent_bits(&root->fs_info->freed_extents[1],
- start, end, EXTENT_UPTODATE, GFP_NOFS);
+ ret = clear_extent_bits(&root->fs_info->freed_extents[0],
+ start, end, EXTENT_UPTODATE, GFP_NOFS);
+ BUG_ON(ret < 0);
+ ret = clear_extent_bits(&root->fs_info->freed_extents[1],
+ start, end, EXTENT_UPTODATE, GFP_NOFS);
+ BUG_ON(ret < 0);
}
static int exclude_super_stripes(struct btrfs_root *root,
@@ -4478,7 +4481,8 @@ int btrfs_finish_extent_commit(struct bt
ret = btrfs_discard_extent(root, start,
end + 1 - start, NULL);
- clear_extent_dirty(unpin, start, end, GFP_NOFS);
+ ret = clear_extent_dirty(unpin, start, end, GFP_NOFS);
+ BUG_ON(ret < 0);
unpin_extent_range(root, start, end);
cond_resched();
}
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -542,7 +542,11 @@ hit_next:
if (state->start < start) {
prealloc = alloc_extent_state_atomic(prealloc);
- BUG_ON(!prealloc);
+ if (!prealloc) {
+ err = -ENOMEM;
+ goto out;
+ }
+
err = split_state(tree, state, prealloc, start);
if (err)
extent_io_tree_panic(tree, err);
@@ -566,7 +570,11 @@ hit_next:
*/
if (state->start <= end && state->end > end) {
prealloc = alloc_extent_state_atomic(prealloc);
- BUG_ON(!prealloc);
+ if (!prealloc) {
+ err = -ENOMEM;
+ goto out;
+ }
+
err = split_state(tree, state, prealloc, end + 1);
if (err)
extent_io_tree_panic(tree, err);
@@ -1172,7 +1180,10 @@ int set_extent_uptodate(struct extent_io
static int clear_extent_uptodate(struct extent_io_tree *tree, u64 start,
u64 end, struct extent_state **cached_state,
- gfp_t mask)
+ gfp_t mask) __must_check;
+static int __must_check
+clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
+ struct extent_state **cached_state, gfp_t mask)
{
return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0,
cached_state, mask);
@@ -1216,9 +1227,12 @@ int try_lock_extent(struct extent_io_tre
err = set_extent_bit(tree, start, end, EXTENT_LOCKED, EXTENT_LOCKED,
&failed_start, NULL, mask);
if (err == -EEXIST) {
- if (failed_start > start)
- clear_extent_bit(tree, start, failed_start - 1,
- EXTENT_LOCKED, 1, 0, NULL, mask);
+ if (failed_start > start) {
+ err = clear_extent_bit(tree, start, failed_start - 1,
+ EXTENT_LOCKED, 1, 0, NULL,
+ mask);
+ BUG_ON(err < 0);
+ }
return 0;
} else if (err < 0)
return err;
@@ -1228,14 +1242,18 @@ int try_lock_extent(struct extent_io_tre
int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end,
struct extent_state **cached, gfp_t mask)
{
- return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached,
- mask);
+ int ret = clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0,
+ cached, mask);
+ BUG_ON(ret < 0);
+ return ret;
}
int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask)
{
- return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL,
- mask);
+ int ret = clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL,
+ mask);
+ BUG_ON(ret < 0);
+ return ret;
}
/*
@@ -1575,7 +1593,9 @@ int extent_clear_unlock_delalloc(struct
if (op & EXTENT_CLEAR_DELALLOC)
clear_bits |= EXTENT_DELALLOC;
- clear_extent_bit(tree, start, end, clear_bits, 1, 0, NULL, GFP_NOFS);
+ ret = clear_extent_bit(tree, start, end, clear_bits,
+ 1, 0, NULL, GFP_NOFS);
+ BUG_ON(ret < 0);
if (!(op & (EXTENT_CLEAR_UNLOCK_PAGE | EXTENT_CLEAR_DIRTY |
EXTENT_SET_WRITEBACK | EXTENT_END_WRITEBACK |
EXTENT_SET_PRIVATE2)))
@@ -1880,7 +1900,9 @@ static void end_bio_extent_writepage(str
}
if (!uptodate) {
- clear_extent_uptodate(tree, start, end, NULL, GFP_NOFS);
+ ret = clear_extent_uptodate(tree, start, end,
+ NULL, GFP_NOFS);
+ BUG_ON(ret < 0);
ClearPageUptodate(page);
SetPageError(page);
}
@@ -2863,10 +2885,11 @@ int extent_invalidatepage(struct extent_
ret = lock_extent_bits(tree, start, end, 0, &cached_state, GFP_NOFS);
BUG_ON(ret < 0);
wait_on_page_writeback(page);
- clear_extent_bit(tree, start, end,
- EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC |
- EXTENT_DO_ACCOUNTING,
- 1, 1, &cached_state, GFP_NOFS);
+ ret = clear_extent_bit(tree, start, end,
+ EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC |
+ EXTENT_DO_ACCOUNTING,
+ 1, 1, &cached_state, GFP_NOFS);
+ BUG_ON(ret < 0);
return 0;
}
@@ -3489,8 +3512,10 @@ int clear_extent_buffer_uptodate(struct
clear_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
if (eb_straddles_pages(eb)) {
- clear_extent_uptodate(tree, eb->start, eb->start + eb->len - 1,
- cached_state, GFP_NOFS);
+ int ret = clear_extent_uptodate(tree, eb->start,
+ eb->start + eb->len - 1,
+ cached_state, GFP_NOFS);
+ BUG_ON(ret < 0);
}
for (i = 0; i < num_pages; i++) {
page = extent_buffer_page(eb, i);
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -200,10 +200,10 @@ void free_extent_state(struct extent_sta
int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
int bits, int filled, struct extent_state *cached_state);
int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
- int bits, gfp_t mask);
+ int bits, gfp_t mask) __must_check;
int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
- int bits, int wake, int delete, struct extent_state **cached,
- gfp_t mask);
+ int bits, int wake, int delete,
+ struct extent_state **cached, gfp_t mask) __must_check;
int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
int bits, gfp_t mask) __must_check;
int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
@@ -218,7 +218,7 @@ int set_extent_new(struct extent_io_tree
int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
gfp_t mask) __must_check;
int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
- gfp_t mask);
+ gfp_t mask) __must_check;
int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
int bits, int clear_bits, gfp_t mask);
int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1128,10 +1128,12 @@ again:
if (ordered)
btrfs_put_ordered_extent(ordered);
- clear_extent_bit(&BTRFS_I(inode)->io_tree, start_pos,
- last_pos - 1, EXTENT_DIRTY | EXTENT_DELALLOC |
- EXTENT_DO_ACCOUNTING, 0, 0, &cached_state,
- GFP_NOFS);
+ err = clear_extent_bit(&BTRFS_I(inode)->io_tree, start_pos,
+ last_pos - 1,
+ EXTENT_DIRTY | EXTENT_DELALLOC |
+ EXTENT_DO_ACCOUNTING, 0, 0,
+ &cached_state, GFP_NOFS);
+ BUG_ON(err < 0);
unlock_extent_cached(&BTRFS_I(inode)->io_tree,
start_pos, last_pos - 1, &cached_state,
GFP_NOFS);
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -964,9 +964,11 @@ int __btrfs_write_out_cache(struct btrfs
ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
if (ret < 0) {
- clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, inode->i_size - 1,
+ ret = clear_extent_bit(&BTRFS_I(inode)->io_tree, 0,
+ inode->i_size - 1,
EXTENT_DIRTY | EXTENT_DELALLOC, 0, 0, NULL,
GFP_NOFS);
+ BUG_ON(ret < 0);
goto out;
}
leaf = path->nodes[0];
@@ -977,10 +979,11 @@ int __btrfs_write_out_cache(struct btrfs
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
if (found_key.objectid != BTRFS_FREE_SPACE_OBJECTID ||
found_key.offset != offset) {
- clear_extent_bit(&BTRFS_I(inode)->io_tree, 0,
+ ret = clear_extent_bit(&BTRFS_I(inode)->io_tree, 0,
inode->i_size - 1,
EXTENT_DIRTY | EXTENT_DELALLOC, 0, 0,
NULL, GFP_NOFS);
+ BUG_ON(ret < 0);
btrfs_release_path(path);
goto out;
}
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -960,9 +960,11 @@ static int cow_file_range_async(struct i
unsigned long nr_pages;
u64 cur_end;
int limit = 10 * 1024 * 1042;
+ int ret;
- clear_extent_bit(&BTRFS_I(inode)->io_tree, start, end, EXTENT_LOCKED,
- 1, 0, NULL, GFP_NOFS);
+ ret = clear_extent_bit(&BTRFS_I(inode)->io_tree, start, end,
+ EXTENT_LOCKED, 1, 0, NULL, GFP_NOFS);
+ BUG_ON(ret < 0);
while (start < end) {
async_cow = kmalloc(sizeof(*async_cow), GFP_NOFS);
BUG_ON(!async_cow);
@@ -1917,9 +1919,11 @@ static int btrfs_io_failed_hook(struct b
}
if (!state || failrec->last_mirror > num_copies) {
set_state_private(failure_tree, failrec->start, 0);
- clear_extent_bits(failure_tree, failrec->start,
- failrec->start + failrec->len - 1,
- EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS);
+ ret = clear_extent_bits(failure_tree, failrec->start,
+ failrec->start + failrec->len - 1,
+ EXTENT_LOCKED | EXTENT_DIRTY,
+ GFP_NOFS);
+ BUG_ON(ret < 0);
kfree(failrec);
return -EIO;
}
@@ -1963,11 +1967,13 @@ static int btrfs_clean_io_failures(struc
private_failure;
set_state_private(&BTRFS_I(inode)->io_failure_tree,
failure->start, 0);
- clear_extent_bits(&BTRFS_I(inode)->io_failure_tree,
+ ret = clear_extent_bits(
+ &BTRFS_I(inode)->io_failure_tree,
failure->start,
failure->start + failure->len - 1,
EXTENT_DIRTY | EXTENT_LOCKED,
GFP_NOFS);
+ BUG_ON(ret < 0);
kfree(failure);
}
}
@@ -2001,8 +2007,9 @@ static int btrfs_readpage_end_io_hook(st
if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID &&
test_range_bit(io_tree, start, end, EXTENT_NODATASUM, 1, NULL)) {
- clear_extent_bits(io_tree, start, end, EXTENT_NODATASUM,
- GFP_NOFS);
+ ret = clear_extent_bits(io_tree, start, end, EXTENT_NODATASUM,
+ GFP_NOFS);
+ BUG_ON(ret < 0);
return 0;
}
@@ -3365,9 +3372,11 @@ again:
goto again;
}
- clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, page_end,
- EXTENT_DIRTY | EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING,
- 0, 0, &cached_state, GFP_NOFS);
+ ret = clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, page_end,
+ EXTENT_DIRTY | EXTENT_DELALLOC |
+ EXTENT_DO_ACCOUNTING, 0, 0,
+ &cached_state, GFP_NOFS);
+ BUG_ON(ret < 0);
ret = btrfs_set_extent_delalloc(inode, page_start, page_end,
&cached_state);
@@ -5565,6 +5574,7 @@ static int btrfs_get_blocks_direct(struc
u64 start = iblock << inode->i_blkbits;
u64 len = bh_result->b_size;
struct btrfs_trans_handle *trans;
+ int ret;
em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
if (IS_ERR(em))
@@ -5660,9 +5670,11 @@ must_cow:
return PTR_ERR(em);
len = min(len, em->len - (start - em->start));
unlock:
- clear_extent_bit(&BTRFS_I(inode)->io_tree, start, start + len - 1,
- EXTENT_LOCKED | EXTENT_DELALLOC | EXTENT_DIRTY, 1,
- 0, NULL, GFP_NOFS);
+ ret = clear_extent_bit(&BTRFS_I(inode)->io_tree, start,
+ start + len - 1,
+ EXTENT_LOCKED | EXTENT_DELALLOC | EXTENT_DIRTY,
+ 1, 0, NULL, GFP_NOFS);
+ BUG_ON(ret < 0);
map:
bh_result->b_blocknr = (em->block_start + (start - em->start)) >>
inode->i_blkbits;
@@ -6234,9 +6246,12 @@ static ssize_t btrfs_direct_IO(int rw, s
&cached_state, GFP_NOFS);
BUG_ON(ret < 0);
if (ret) {
- clear_extent_bit(&BTRFS_I(inode)->io_tree, lockstart,
- lockend, EXTENT_LOCKED | write_bits,
- 1, 0, &cached_state, GFP_NOFS);
+ int ret2;
+ ret2 = clear_extent_bit(&BTRFS_I(inode)->io_tree,
+ lockstart, lockend,
+ EXTENT_LOCKED | write_bits,
+ 1, 0, &cached_state, GFP_NOFS);
+ BUG_ON(ret2 < 0);
goto out;
}
}
@@ -6250,19 +6265,23 @@ static ssize_t btrfs_direct_IO(int rw, s
btrfs_submit_direct, 0);
if (ret < 0 && ret != -EIOCBQUEUED) {
- clear_extent_bit(&BTRFS_I(inode)->io_tree, offset,
- offset + iov_length(iov, nr_segs) - 1,
- EXTENT_LOCKED | write_bits, 1, 0,
- &cached_state, GFP_NOFS);
+ ret = clear_extent_bit(&BTRFS_I(inode)->io_tree, offset,
+ offset + iov_length(iov, nr_segs) - 1,
+ EXTENT_LOCKED | write_bits, 1, 0,
+ &cached_state, GFP_NOFS);
+ BUG_ON(ret < 0);
+ ret = 0;
} else if (ret >= 0 && ret < iov_length(iov, nr_segs)) {
/*
* We're falling back to buffered, unlock the section we didn't
* do IO on.
*/
- clear_extent_bit(&BTRFS_I(inode)->io_tree, offset + ret,
- offset + iov_length(iov, nr_segs) - 1,
- EXTENT_LOCKED | write_bits, 1, 0,
- &cached_state, GFP_NOFS);
+ ret = clear_extent_bit(&BTRFS_I(inode)->io_tree, offset + ret,
+ offset + iov_length(iov, nr_segs) - 1,
+ EXTENT_LOCKED | write_bits, 1, 0,
+ &cached_state, GFP_NOFS);
+ BUG_ON(ret < 0);
+ ret = 0;
}
out:
free_extent_state(cached_state);
@@ -6372,10 +6391,11 @@ static void btrfs_invalidatepage(struct
* IO on this page will never be started, so we need
* to account for any ordered extents now
*/
- clear_extent_bit(tree, page_start, page_end,
- EXTENT_DIRTY | EXTENT_DELALLOC |
- EXTENT_LOCKED | EXTENT_DO_ACCOUNTING, 1, 0,
- &cached_state, GFP_NOFS);
+ ret = clear_extent_bit(tree, page_start, page_end,
+ EXTENT_DIRTY | EXTENT_DELALLOC |
+ EXTENT_LOCKED | EXTENT_DO_ACCOUNTING,
+ 1, 0, &cached_state, GFP_NOFS);
+ BUG_ON(ret < 0);
/*
* whoever cleared the private bit is responsible
* for the finish_ordered_io
@@ -6390,9 +6410,11 @@ static void btrfs_invalidatepage(struct
0, &cached_state, GFP_NOFS);
BUG_ON(ret < 0);
}
- clear_extent_bit(tree, page_start, page_end,
- EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC |
- EXTENT_DO_ACCOUNTING, 1, 1, &cached_state, GFP_NOFS);
+ ret = clear_extent_bit(tree, page_start, page_end,
+ EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC |
+ EXTENT_DO_ACCOUNTING, 1, 1,
+ &cached_state, GFP_NOFS);
+ BUG_ON(ret < 0);
__btrfs_releasepage(page, GFP_NOFS);
ClearPageChecked(page);
@@ -6482,9 +6504,11 @@ again:
* is probably a better way to do this, but for now keep consistent with
* prepare_pages in the normal write path.
*/
- clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, page_end,
- EXTENT_DIRTY | EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING,
- 0, 0, &cached_state, GFP_NOFS);
+ ret = clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, page_end,
+ EXTENT_DIRTY | EXTENT_DELALLOC |
+ EXTENT_DO_ACCOUNTING, 0, 0,
+ &cached_state, GFP_NOFS);
+ BUG_ON(ret < 0);
ret = btrfs_set_extent_delalloc(inode, page_start, page_end,
&cached_state);
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -932,10 +932,11 @@ again:
if (ordered)
btrfs_put_ordered_extent(ordered);
- clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start,
- page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC |
- EXTENT_DO_ACCOUNTING, 0, 0, &cached_state,
- GFP_NOFS);
+ ret = clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start,
+ page_end - 1, EXTENT_DIRTY | EXTENT_DELALLOC |
+ EXTENT_DO_ACCOUNTING, 0, 0, &cached_state,
+ GFP_NOFS);
+ BUG_ON(ret < 0);
if (i_done != num_pages) {
spin_lock(&BTRFS_I(inode)->lock);
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -3853,8 +3853,9 @@ restart:
}
btrfs_release_path(path);
- clear_extent_bits(&rc->processed_blocks, 0, (u64)-1, EXTENT_DIRTY,
- GFP_NOFS);
+ ret = clear_extent_bits(&rc->processed_blocks, 0, (u64)-1,
+ EXTENT_DIRTY, GFP_NOFS);
+ BUG_ON(ret < 0);
if (trans) {
nr = trans->blocks_used;
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -610,7 +610,9 @@ int btrfs_wait_marked_extents(struct btr
while (!find_first_extent_bit(dirty_pages, start, &start, &end,
EXTENT_NEED_WAIT)) {
- clear_extent_bits(dirty_pages, start, end, EXTENT_NEED_WAIT, GFP_NOFS);
+ err = clear_extent_bits(dirty_pages, start, end,
+ EXTENT_NEED_WAIT, GFP_NOFS);
+ BUG_ON(err < 0);
err = filemap_fdatawait_range(mapping, start, end);
if (err)
werr = err;
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -2178,8 +2178,9 @@ static void free_log_tree(struct btrfs_t
if (ret)
break;
- clear_extent_bits(&log->dirty_log_pages, start, end,
- EXTENT_DIRTY | EXTENT_NEW, GFP_NOFS);
+ ret = clear_extent_bits(&log->dirty_log_pages, start, end,
+ EXTENT_DIRTY | EXTENT_NEW, GFP_NOFS);
+ BUG_ON(ret < 0);
}
free_extent_buffer(log->node);
--
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