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| author | Ritesh Harjani <ritesh.list@gmail.com> | 2023-07-16 17:03:34 +0300 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2023-08-05 15:18:04 +0300 |
| commit | 772c9f691dcf3a487f29ddb90a5a15c78d7328e1 (patch) | |
| tree | f8d6c8f7ea464a9b36accc116529480cd47210c7 /fs/ext4 | |
| parent | e15e117bbbe18258a5ad506bbf6c58ff129c9576 (diff) | |
| download | linux-772c9f691dcf3a487f29ddb90a5a15c78d7328e1.tar.xz | |
ext4: don't use CR_BEST_AVAIL_LEN for non-regular files
Using CR_BEST_AVAIL_LEN only make sense for regular files, as for
non-regular files we never normalize the allocation request length i.e.
goal len is same as original length (ac_g_ex.fe_len == ac_o_ex.fe_len).
Hence there is no scope of trimming the goal length to make it
satisfy original request len. Thus this patch avoids using
CR_BEST_AVAIL_LEN criteria for non-regular files request.
Cc: stable@kernel.org
Fixes: 33122aa930f1 ("ext4: Add allocation criteria 1.5 (CR1_5)")
Reported-by: Eric Whitney <enwlinux@gmail.com>
Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Tested-by: Eric Whitney <enwlinux@gmail.com>
Link: https://lore.kernel.org/r/2a694c748ff8b8c4b416995a24f06f07b55047a8.1689516047.git.ritesh.list@gmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4')
| -rw-r--r-- | fs/ext4/mballoc.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index b89b5f0816e7..3d5b0b71d7f5 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -966,7 +966,18 @@ static void ext4_mb_choose_next_group_goal_fast(struct ext4_allocation_context * } } - *new_cr = CR_BEST_AVAIL_LEN; + /* + * CR_BEST_AVAIL_LEN works based on the concept that we have + * a larger normalized goal len request which can be trimmed to + * a smaller goal len such that it can still satisfy original + * request len. However, allocation request for non-regular + * files never gets normalized. + * See function ext4_mb_normalize_request() (EXT4_MB_HINT_DATA). + */ + if (ac->ac_flags & EXT4_MB_HINT_DATA) + *new_cr = CR_BEST_AVAIL_LEN; + else + *new_cr = CR_GOAL_LEN_SLOW; } /* |