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f2fs: ro: don't start discard thread for readonly image

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[ 9299.893835] F2FS-fs (vdd): Allow to mount readonly mode only
mount: /mnt/f2fs: WARNING: source write-protected, mounted read-only.
root@qemu:/ ps -ef|grep f2fs
root          94       2  0 03:46 ?        00:00:00 [kworker/u17:0-f2fs_post_read_wq]
root        6282       2  0 06:21 ?        00:00:00 [f2fs_discard-253:48]

There will be no deletion in readonly image, let's skip starting
discard thread to save system resources.

Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2024-02-26 15:35:39 +08:00 committed by Jaegeuk Kim
parent 4b99ecd304
commit a217f1873a
1 changed files with 6 additions and 0 deletions
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6
fs/f2fs/segment.c
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@ -2253,6 +2253,12 @@ int f2fs_start_discard_thread(struct f2fs_sb_info *sbi)
struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
int err = 0;
if (f2fs_sb_has_readonly(sbi)) {
f2fs_info(sbi,
"Skip to start discard thread for readonly image");
return 0;
}
if (!f2fs_realtime_discard_enable(sbi))
return 0;