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for-5.8-rc4-tag 

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Merge tag 'for-5.8-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux

Pull btrfs fixes from David Sterba:

 - regression fix of a leak in global block reserve accounting

 - fix a (hard to hit) race of readahead vs releasepage that could lead
   to crash

 - convert all remaining uses of comment fall through annotations to the
   pseudo keyword

 - fix crash when mounting a fuzzed image with -o recovery

* tag 'for-5.8-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
  btrfs: reset tree root pointer after error in init_tree_roots
  btrfs: fix reclaim_size counter leak after stealing from global reserve
  btrfs: fix fatal extent_buffer readahead vs releasepage race
  btrfs: convert comments to fallthrough annotations
This commit is contained in:
Linus Torvalds 2020-07-07 14:10:33 -07:00
parent 9e4d769621 0465337c55
commit aa27b32b76
7 changed files with 35 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/btrfs/ctree.c
View File

@ -1196,7 +1196,7 @@ __tree_mod_log_rewind(struct btrfs_fs_info *fs_info, struct extent_buffer *eb,
switch (tm->op) {
case MOD_LOG_KEY_REMOVE_WHILE_FREEING:
BUG_ON(tm->slot < n);
/* Fallthrough */
fallthrough;
case MOD_LOG_KEY_REMOVE_WHILE_MOVING:
case MOD_LOG_KEY_REMOVE:
btrfs_set_node_key(eb, &tm->key, tm->slot);

6
fs/btrfs/disk-io.c
View File

@ -2593,10 +2593,12 @@ static int __cold init_tree_roots(struct btrfs_fs_info *fs_info)
!extent_buffer_uptodate(tree_root->node)) {
handle_error = true;
if (IS_ERR(tree_root->node))
if (IS_ERR(tree_root->node)) {
ret = PTR_ERR(tree_root->node);
else if (!extent_buffer_uptodate(tree_root->node))
tree_root->node = NULL;
} else if (!extent_buffer_uptodate(tree_root->node)) {
ret = -EUCLEAN;
}
btrfs_warn(fs_info, "failed to read tree root");
continue;

40
fs/btrfs/extent_io.c
View File

@ -5058,25 +5058,28 @@ struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
static void check_buffer_tree_ref(struct extent_buffer *eb)
{
int refs;
/* the ref bit is tricky. We have to make sure it is set
* if we have the buffer dirty. Otherwise the
* code to free a buffer can end up dropping a dirty
* page
/*
* The TREE_REF bit is first set when the extent_buffer is added
* to the radix tree. It is also reset, if unset, when a new reference
* is created by find_extent_buffer.
*
* Once the ref bit is set, it won't go away while the
* buffer is dirty or in writeback, and it also won't
* go away while we have the reference count on the
* eb bumped.
* It is only cleared in two cases: freeing the last non-tree
* reference to the extent_buffer when its STALE bit is set or
* calling releasepage when the tree reference is the only reference.
*
* We can't just set the ref bit without bumping the
* ref on the eb because free_extent_buffer might
* see the ref bit and try to clear it. If this happens
* free_extent_buffer might end up dropping our original
* ref by mistake and freeing the page before we are able
* to add one more ref.
* In both cases, care is taken to ensure that the extent_buffer's
* pages are not under io. However, releasepage can be concurrently
* called with creating new references, which is prone to race
* conditions between the calls to check_buffer_tree_ref in those
* codepaths and clearing TREE_REF in try_release_extent_buffer.
*
* So bump the ref count first, then set the bit. If someone
* beat us to it, drop the ref we added.
* The actual lifetime of the extent_buffer in the radix tree is
* adequately protected by the refcount, but the TREE_REF bit and
* its corresponding reference are not. To protect against this
* class of races, we call check_buffer_tree_ref from the codepaths
* which trigger io after they set eb->io_pages. Note that once io is
* initiated, TREE_REF can no longer be cleared, so that is the
* moment at which any such race is best fixed.
*/
refs = atomic_read(&eb->refs);
if (refs >= 2 && test_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags))
@ -5527,6 +5530,11 @@ int read_extent_buffer_pages(struct extent_buffer *eb, int wait, int mirror_num)
clear_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags);
eb->read_mirror = 0;
atomic_set(&eb->io_pages, num_reads);
/*
* It is possible for releasepage to clear the TREE_REF bit before we
* set io_pages. See check_buffer_tree_ref for a more detailed comment.
*/
check_buffer_tree_ref(eb);
for (i = 0; i < num_pages; i++) {
page = eb->pages[i];

2
fs/btrfs/ref-verify.c
View File

@ -509,7 +509,7 @@ static int process_leaf(struct btrfs_root *root,
switch (key.type) {
case BTRFS_EXTENT_ITEM_KEY:
*num_bytes = key.offset;
/* fall through */
fallthrough;
case BTRFS_METADATA_ITEM_KEY:
*bytenr = key.objectid;
ret = process_extent_item(fs_info, path, &key, i,

2
fs/btrfs/space-info.c
View File

@ -879,8 +879,8 @@ static bool steal_from_global_rsv(struct btrfs_fs_info *fs_info,
return false;
}
global_rsv->reserved -= ticket->bytes;
remove_ticket(space_info, ticket);
ticket->bytes = 0;
list_del_init(&ticket->list);
wake_up(&ticket->wait);
space_info->tickets_id++;
if (global_rsv->reserved < global_rsv->size)

6
fs/btrfs/super.c
View File

@ -523,7 +523,7 @@ int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
case Opt_compress_force:
case Opt_compress_force_type:
compress_force = true;
/* Fallthrough */
fallthrough;
case Opt_compress:
case Opt_compress_type:
saved_compress_type = btrfs_test_opt(info,
@ -622,7 +622,7 @@ int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
btrfs_set_opt(info->mount_opt, NOSSD);
btrfs_clear_and_info(info, SSD,
"not using ssd optimizations");
/* Fallthrough */
fallthrough;
case Opt_nossd_spread:
btrfs_clear_and_info(info, SSD_SPREAD,
"not using spread ssd allocation scheme");
@ -793,7 +793,7 @@ int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
case Opt_recovery:
btrfs_warn(info,
"'recovery' is deprecated, use 'usebackuproot' instead");
/* fall through */
fallthrough;
case Opt_usebackuproot:
btrfs_info(info,
"trying to use backup root at mount time");

2
fs/btrfs/volumes.h
View File

@ -408,7 +408,7 @@ static inline enum btrfs_map_op btrfs_op(struct bio *bio)
return BTRFS_MAP_WRITE;
default:
WARN_ON_ONCE(1);
/* fall through */
fallthrough;
case REQ_OP_READ:
return BTRFS_MAP_READ;
}