* [PATCH] fat: hold truncate_lock in fat_write_failed()
@ 2026-10-21 16:21 Matheus Alves de Almeida
2026-10-23 7:34 ` OGAWA Hirofumi
0 siblings, 1 reply; 2+ messages in thread
From: Matheus Alves de Almeida @ 2026-10-21 16:21 UTC (permalink / raw)
To: OGAWA Hirofumi; +Cc: linux-fsdevel, linux-kernel, Matheus Alves de Almeida
The current fat_write_failed() implementation calls into
fat_truncate_blocks() without holding truncate_lock. Make it so it is
held exclusive while truncating.
Fixes: 459f6ed3b8c7 ("fat: convert to use the new truncate convention.")
Signed-off-by: Matheus Alves de Almeida <matheus.aalmeida@inf.ufrgs.br>
---
fs/fat/inode.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 141276fcf8db..2a16ed415631 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -216,7 +216,9 @@ static void fat_write_failed(struct address_space *mapping, loff_t to)
if (to > inode->i_size) {
truncate_pagecache(inode, inode->i_size);
+ down_write(&MSDOS_I(inode)->truncate_lock);
fat_truncate_blocks(inode, inode->i_size);
+ up_write(&MSDOS_I(inode)->truncate_lock);
}
}
--
2.43.0
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [PATCH] fat: hold truncate_lock in fat_write_failed()
2026-10-21 16:21 [PATCH] fat: hold truncate_lock in fat_write_failed() Matheus Alves de Almeida
@ 2026-10-23 7:34 ` OGAWA Hirofumi
0 siblings, 0 replies; 2+ messages in thread
From: OGAWA Hirofumi @ 2026-10-23 7:34 UTC (permalink / raw)
To: Matheus Alves de Almeida; +Cc: linux-fsdevel, linux-kernel
Matheus Alves de Almeida <matheus.aalmeida@inf.ufrgs.br> writes:
> The current fat_write_failed() implementation calls into
> fat_truncate_blocks() without holding truncate_lock. Make it so it is
> held exclusive while truncating.
>
> Fixes: 459f6ed3b8c7 ("fat: convert to use the new truncate convention.")
> Signed-off-by: Matheus Alves de Almeida <matheus.aalmeida@inf.ufrgs.br>
> ---
> fs/fat/inode.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/fs/fat/inode.c b/fs/fat/inode.c
> index 141276fcf8db..2a16ed415631 100644
> --- a/fs/fat/inode.c
> +++ b/fs/fat/inode.c
> @@ -216,7 +216,9 @@ static void fat_write_failed(struct address_space *mapping, loff_t to)
>
> if (to > inode->i_size) {
> truncate_pagecache(inode, inode->i_size);
> + down_write(&MSDOS_I(inode)->truncate_lock);
> fat_truncate_blocks(inode, inode->i_size);
> + up_write(&MSDOS_I(inode)->truncate_lock);
Which race this prevent?
Thanks.
> }
> }
--
OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
^ permalink raw reply [flat|nested] 2+ messages in thread
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2026-10-21 16:21 [PATCH] fat: hold truncate_lock in fat_write_failed() Matheus Alves de Almeida
2026-10-23 7:34 ` OGAWA Hirofumi
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