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ext4: use FGP_WRITEBEGIN for tail block zeroing

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ext4_load_tail_bh() returns a locked folio that callers immediately
mutate through folio_zero_range() and mark_buffer_dirty().  Use
FGP_WRITEBEGIN so that, on backing devices that require stable writes,
__filemap_get_folio() waits for writeback to finish before returning
the folio; on regular devices the wait is a no-op.

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://patch.msgid.link/20260714080044.4038124-2-yi.zhang@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Zhang Yi
2026-07-14 16:00:36 +08:00
committed by Theodore Ts'o
parent 15cb164964
commit e1cf7b5f5c
1 changed files with 1 additions and 1 deletions
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2
fs/ext4/inode.c
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@@ -4053,7 +4053,7 @@ static struct buffer_head *ext4_load_tail_bh(struct inode *inode, loff_t from)
int err = 0;
folio = __filemap_get_folio(mapping, from >> PAGE_SHIFT,
FGP_LOCK | FGP_ACCESSED | FGP_CREAT,
FGP_WRITEBEGIN | FGP_ACCESSED,
mapping_gfp_constraint(mapping, ~__GFP_FS));
if (IS_ERR(folio))
return ERR_CAST(folio);