linux-stable.git/fs/ext4, branch linux-5.14.y

ext4: refresh the ext4_ext_path struct after dropping i_data_sem.

2021-11-17T10:03:27+00:00

commit 1811bc401aa58c7bdb0df3205aa6613b49d32127 upstream.

After we drop i_data sem, we need to reload the ext4_ext_path
structure since the extent tree can change once i_data_sem is
released.

This addresses the BUG:

[52117.465187] ------------[ cut here ]------------
[52117.465686] kernel BUG at fs/ext4/extents.c:1756!
...
[52117.478306] Call Trace:
[52117.478565]  ext4_ext_shift_extents+0x3ee/0x710
[52117.479020]  ext4_fallocate+0x139c/0x1b40
[52117.479405]  ? __do_sys_newfstat+0x6b/0x80
[52117.479805]  vfs_fallocate+0x151/0x4b0
[52117.480177]  ksys_fallocate+0x4a/0xa0
[52117.480533]  __x64_sys_fallocate+0x22/0x30
[52117.480930]  do_syscall_64+0x35/0x80
[52117.481277]  entry_SYSCALL_64_after_hwframe+0x44/0xae
[52117.481769] RIP: 0033:0x7fa062f855ca

Cc: stable@kernel.org
Link: https://lore.kernel.org/r/20210903062748.4118886-4-yangerkun@huawei.com
Signed-off-by: yangerkun 
Signed-off-by: Theodore Ts'o 
Signed-off-by: Greg Kroah-Hartman

ext4: ensure enough credits in ext4_ext_shift_path_extents

2021-11-17T10:03:27+00:00

commit 4268496e48dc681cfa53b92357314b5d7221e625 upstream.

Like ext4_ext_rm_leaf, we can ensure that there are enough credits
before every call that will consume credits.  As part of this fix we
fold the functionality of ext4_access_path() into
ext4_ext_shift_path_extents().  This change is needed as a preparation
for the next bugfix patch.

Cc: stable@kernel.org
Link: https://lore.kernel.org/r/20210903062748.4118886-3-yangerkun@huawei.com
Signed-off-by: yangerkun 
Reviewed-by: Jan Kara 
Signed-off-by: Theodore Ts'o 
Signed-off-by: Greg Kroah-Hartman

ext4: fix lazy initialization next schedule time computation in more granular unit

2021-11-17T10:03:26+00:00

commit 39fec6889d15a658c3a3ebb06fd69d3584ddffd3 upstream.

Ext4 file system has default lazy inode table initialization setup once
it is mounted. However, it has issue on computing the next schedule time
that makes the timeout same amount in jiffies but different real time in
secs if with various HZ values. Therefore, fix by measuring the current
time in a more granular unit nanoseconds and make the next schedule time
independent of the HZ value.

Fixes: bfff68738f1c ("ext4: add support for lazy inode table initialization")
Signed-off-by: Shaoying Xu 
Cc: stable@vger.kernel.org
Signed-off-by: Theodore Ts'o 
Link: https://lore.kernel.org/r/20210902164412.9994-2-shaoyi@amazon.com
Signed-off-by: Theodore Ts'o 
Signed-off-by: Greg Kroah-Hartman

ext4: correct the error path of ext4_write_inline_data_end()

2021-10-17T08:44:48+00:00

[ Upstream commit 55ce2f649b9e88111270333a8127e23f4f8f42d7 ]

Current error path of ext4_write_inline_data_end() is not correct.

Firstly, it should pass out the error value if ext4_get_inode_loc()
return fail, or else it could trigger infinite loop if we inject error
here. And then it's better to add inode to orphan list if it return fail
in ext4_journal_stop(), otherwise we could not restore inline xattr
entry after power failure. Finally, we need to reset the 'ret' value if
ext4_write_inline_data_end() return success in ext4_write_end() and
ext4_journalled_write_end(), otherwise we could not get the error return
value of ext4_journal_stop().

Signed-off-by: Zhang Yi 
Reviewed-by: Jan Kara 
Signed-off-by: Theodore Ts'o 
Link: https://lore.kernel.org/r/20210716122024.1105856-3-yi.zhang@huawei.com
Signed-off-by: Sasha Levin

ext4: check and update i_disksize properly

2021-10-17T08:44:48+00:00

[ Upstream commit 4df031ff5876d94b48dd9ee486ba5522382a06b2 ]

After commit 3da40c7b0898 ("ext4: only call ext4_truncate when size <=
isize"), i_disksize could always be updated to i_size in ext4_setattr(),
and we could sure that i_disksize <= i_size since holding inode lock and
if i_disksize < i_size there are delalloc writes pending in the range
upto i_size. If the end of the current write is <= i_size, there's no
need to touch i_disksize since writeback will push i_disksize upto
i_size eventually. So we can switch to check i_size instead of
i_disksize in ext4_da_write_end() when write to the end of the file.
we also could remove ext4_mark_inode_dirty() together because we defer
inode dirtying to generic_write_end() or ext4_da_write_inline_data_end().

Signed-off-by: Zhang Yi 
Reviewed-by: Jan Kara 
Signed-off-by: Theodore Ts'o 
Link: https://lore.kernel.org/r/20210716122024.1105856-2-yi.zhang@huawei.com
Signed-off-by: Sasha Levin

ext4: flush s_error_work before journal destroy in ext4_fill_super

2021-10-07T05:53:18+00:00

commit bb9464e08309f6befe80866f5be51778ca355ee9 upstream.

The error path in ext4_fill_super forget to flush s_error_work before
journal destroy, and it may trigger the follow bug since
flush_stashed_error_work can run concurrently with journal destroy
without any protection for sbi->s_journal.

[32031.740193] EXT4-fs (loop66): get root inode failed
[32031.740484] EXT4-fs (loop66): mount failed
[32031.759805] ------------[ cut here ]------------
[32031.759807] kernel BUG at fs/jbd2/transaction.c:373!
[32031.760075] invalid opcode: 0000 [#1] SMP PTI
[32031.760336] CPU: 5 PID: 1029268 Comm: kworker/5:1 Kdump: loaded
4.18.0
[32031.765112] Call Trace:
[32031.765375]  ? __switch_to_asm+0x35/0x70
[32031.765635]  ? __switch_to_asm+0x41/0x70
[32031.765893]  ? __switch_to_asm+0x35/0x70
[32031.766148]  ? __switch_to_asm+0x41/0x70
[32031.766405]  ? _cond_resched+0x15/0x40
[32031.766665]  jbd2__journal_start+0xf1/0x1f0 [jbd2]
[32031.766934]  jbd2_journal_start+0x19/0x20 [jbd2]
[32031.767218]  flush_stashed_error_work+0x30/0x90 [ext4]
[32031.767487]  process_one_work+0x195/0x390
[32031.767747]  worker_thread+0x30/0x390
[32031.768007]  ? process_one_work+0x390/0x390
[32031.768265]  kthread+0x10d/0x130
[32031.768521]  ? kthread_flush_work_fn+0x10/0x10
[32031.768778]  ret_from_fork+0x35/0x40

static int start_this_handle(...)
    BUG_ON(journal->j_flags & JBD2_UNMOUNT); <---- Trigger this

Besides, after we enable fast commit, ext4_fc_replay can add work to
s_error_work but return success, so the latter journal destroy in
ext4_load_journal can trigger this problem too.

Fix this problem with two steps:
1. Call ext4_commit_super directly in ext4_handle_error for the case
   that called from ext4_fc_replay
2. Since it's hard to pair the init and flush for s_error_work, we'd
   better add a extras flush_work before journal destroy in
   ext4_fill_super

Besides, this patch will call ext4_commit_super in ext4_handle_error for
any nojournal case too. But it seems safe since the reason we call
schedule_work was that we should save error info to sb through journal
if available. Conversely, for the nojournal case, it seems useless delay
commit superblock to s_error_work.

Fixes: c92dc856848f ("ext4: defer saving error info from atomic context")
Fixes: 2d01ddc86606 ("ext4: save error info to sb through journal if available")
Cc: stable@kernel.org
Signed-off-by: yangerkun 
Reviewed-by: Jan Kara 
Signed-off-by: Theodore Ts'o 
Link: https://lore.kernel.org/r/20210924093917.1953239-1-yangerkun@huawei.com
Signed-off-by: Greg Kroah-Hartman

ext4: fix potential infinite loop in ext4_dx_readdir()

2021-10-07T05:53:18+00:00

commit 42cb447410d024e9d54139ae9c21ea132a8c384c upstream.

When ext4_htree_fill_tree() fails, ext4_dx_readdir() can run into an
infinite loop since if info->last_pos != ctx->pos this will reset the
directory scan and reread the failing entry.  For example:

1. a dx_dir which has 3 block, block 0 as dx_root block, block 1/2 as
   leaf block which own the ext4_dir_entry_2
2. block 1 read ok and call_filldir which will fill the dirent and update
   the ctx->pos
3. block 2 read fail, but we has already fill some dirent, so we will
   return back to userspace will a positive return val(see ksys_getdents64)
4. the second ext4_dx_readdir will reset the world since info->last_pos
   != ctx->pos, and will also init the curr_hash which pos to block 1
5. So we will read block1 too, and once block2 still read fail, we can
   only fill one dirent because the hash of the entry in block1(besides
   the last one) won't greater than curr_hash
6. this time, we forget update last_pos too since the read for block2
   will fail, and since we has got the one entry, ksys_getdents64 can
   return success
7. Latter we will trapped in a loop with step 4~6

Cc: stable@kernel.org
Signed-off-by: yangerkun 
Reviewed-by: Jan Kara 
Signed-off-by: Theodore Ts'o 
Link: https://lore.kernel.org/r/20210914111415.3921954-1-yangerkun@huawei.com
Signed-off-by: Greg Kroah-Hartman

ext4: add error checking to ext4_ext_replay_set_iblocks()

2021-10-07T05:53:18+00:00

commit 1fd95c05d8f742abfe906620780aee4dbe1a2db0 upstream.

If the call to ext4_map_blocks() fails due to an corrupted file
system, ext4_ext_replay_set_iblocks() can get stuck in an infinite
loop.  This could be reproduced by running generic/526 with a file
system that has inline_data and fast_commit enabled.  The system will
repeatedly log to the console:

EXT4-fs warning (device dm-3): ext4_block_to_path:105: block 1074800922 > max in inode 131076

and the stack that it gets stuck in is:

   ext4_block_to_path+0xe3/0x130
   ext4_ind_map_blocks+0x93/0x690
   ext4_map_blocks+0x100/0x660
   skip_hole+0x47/0x70
   ext4_ext_replay_set_iblocks+0x223/0x440
   ext4_fc_replay_inode+0x29e/0x3b0
   ext4_fc_replay+0x278/0x550
   do_one_pass+0x646/0xc10
   jbd2_journal_recover+0x14a/0x270
   jbd2_journal_load+0xc4/0x150
   ext4_load_journal+0x1f3/0x490
   ext4_fill_super+0x22d4/0x2c00

With this patch, generic/526 still fails, but system is no longer
locking up in a tight loop.  It's likely the root casue is that
fast_commit replay is corrupting file systems with inline_data, and we
probably need to add better error handling in the fast commit replay
code path beyond what is done here, which essentially just breaks the
infinite loop without reporting the to the higher levels of the code.

Fixes: 8016E29F4362 ("ext4: fast commit recovery path")
Cc: stable@kernel.org
Cc: Harshad Shirwadkar 
Signed-off-by: Theodore Ts'o 
Signed-off-by: Greg Kroah-Hartman

ext4: fix reserved space counter leakage

2021-10-07T05:53:18+00:00

commit 6fed83957f21eff11c8496e9f24253b03d2bc1dc upstream.

When ext4_insert_delayed block receives and recovers from an error from
ext4_es_insert_delayed_block(), e.g., ENOMEM, it does not release the
space it has reserved for that block insertion as it should. One effect
of this bug is that s_dirtyclusters_counter is not decremented and
remains incorrectly elevated until the file system has been unmounted.
This can result in premature ENOSPC returns and apparent loss of free
space.

Another effect of this bug is that
/sys/fs/ext4//delayed_allocation_blocks can remain non-zero even
after syncfs has been executed on the filesystem.

Besides, add check for s_dirtyclusters_counter when inode is going to be
evicted and freed. s_dirtyclusters_counter can still keep non-zero until
inode is written back in .evict_inode(), and thus the check is delayed
to .destroy_inode().

Fixes: 51865fda28e5 ("ext4: let ext4 maintain extent status tree")
Cc: stable@kernel.org
Suggested-by: Gao Xiang 
Signed-off-by: Jeffle Xu 
Reviewed-by: Eric Whitney 
Signed-off-by: Theodore Ts'o 
Link: https://lore.kernel.org/r/20210823061358.84473-1-jefflexu@linux.alibaba.com
Signed-off-by: Greg Kroah-Hartman

ext4: limit the number of blocks in one ADD_RANGE TLV

2021-10-07T05:53:17+00:00

commit a2c2f0826e2b75560b31daf1cd9a755ab93cf4c6 upstream.

Now EXT4_FC_TAG_ADD_RANGE uses ext4_extent to track the
newly-added blocks, but the limit on the max value of
ee_len field is ignored, and it can lead to BUG_ON as
shown below when running command "fallocate -l 128M file"
on a fast_commit-enabled fs:

  kernel BUG at fs/ext4/ext4_extents.h:199!
  invalid opcode: 0000 [#1] SMP PTI
  CPU: 3 PID: 624 Comm: fallocate Not tainted 5.14.0-rc6+ #1
  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)
  RIP: 0010:ext4_fc_write_inode_data+0x1f3/0x200
  Call Trace:
   ? ext4_fc_write_inode+0xf2/0x150
   ext4_fc_commit+0x93b/0xa00
   ? ext4_fallocate+0x1ad/0x10d0
   ext4_sync_file+0x157/0x340
   ? ext4_sync_file+0x157/0x340
   vfs_fsync_range+0x49/0x80
   do_fsync+0x3d/0x70
   __x64_sys_fsync+0x14/0x20
   do_syscall_64+0x3b/0xc0
   entry_SYSCALL_64_after_hwframe+0x44/0xae

Simply fixing it by limiting the number of blocks
in one EXT4_FC_TAG_ADD_RANGE TLV.

Fixes: aa75f4d3daae ("ext4: main fast-commit commit path")
Cc: stable@kernel.org
Signed-off-by: Hou Tao 
Signed-off-by: Theodore Ts'o 
Link: https://lore.kernel.org/r/20210820044505.474318-1-houtao1@huawei.com
Signed-off-by: Greg Kroah-Hartman