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ntfs: serialize raw MFT updates against folio writeback

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Because MFT folio writeback can remain active until its asynchronous BIO
completes, raw MFT record formatting and allocation must not modify the
folio while it is still used as a BIO source.

Wait for existing folio writeback after taking the folio lock in both
raw MFT update paths.

Fixes: 115380f9a2 ("ntfs: update mft operations")
Cc: stable@vger.kernel.org
Signed-off-by: Hyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
This commit is contained in:
Hyunchul Lee 2026-09-21 15:44:06 +09:00 committed by Namjae Jeon
parent b9fa884a39
commit ec0a5dd2e3
1 changed files with 4 additions and 0 deletions
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4
fs/ntfs/mft.c
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@ -2022,6 +2022,8 @@ static int ntfs_mft_record_format(const struct ntfs_volume *vol, const s64 mft_n
return PTR_ERR(folio);
}
folio_lock(folio);
if (folio_test_writeback(folio))
folio_wait_writeback(folio);
folio_clear_uptodate(folio);
m = (struct mft_record *)((u8 *)kmap_local_folio(folio, 0) + ofs);
err = ntfs_mft_record_layout(vol, mft_no, m);
@ -2539,6 +2541,8 @@ int ntfs_mft_record_alloc(struct ntfs_volume *vol, const int mode,
goto undo_mftbmp_alloc;
}
folio_lock(folio);
if (folio_test_writeback(folio))
folio_wait_writeback(folio);
folio_clear_uptodate(folio);
m = (struct mft_record *)((u8 *)kmap_local_folio(folio, 0) + ofs);
/* If we just formatted the mft record no need to do it again. */