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f2fs: ro: don't start discard thread for readonly image
[ 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>
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@ -2253,6 +2253,12 @@ int f2fs_start_discard_thread(struct f2fs_sb_info *sbi)
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struct discard_cmd_control *dcc = SM_I(sbi)->dcc_info;
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int err = 0;
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if (f2fs_sb_has_readonly(sbi)) {
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f2fs_info(sbi,
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"Skip to start discard thread for readonly image");
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return 0;
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}
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if (!f2fs_realtime_discard_enable(sbi))
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return 0;
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