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exfat: replace truncate_lock with inode_lock

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Remove the per-inode truncate_lock and rely on inode_lock instead.
exfat_setattr() truncates under inode_lock (held exclusively by the
VFS callers), and exfat_aop_bmap() now takes inode_lock shared to
exclude a concurrent truncate, providing the same mutual exclusion
with a single lock.

Signed-off-by: Chi Zhiling <chizhiling@kylinos.cn>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
This commit is contained in:
Chi Zhiling 2026-08-17 14:20:33 +08:00 committed by Namjae Jeon
parent 2de727471b
commit 490529f668
4 changed files with 2 additions and 8 deletions
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2
fs/exfat/exfat_fs.h
View File

@ -298,8 +298,6 @@ struct exfat_inode_info {
loff_t zeroed_size;
/* hash by i_location */
struct hlist_node i_hash_fat;
/* protect bmap against truncate */
struct rw_semaphore truncate_lock;
struct inode vfs_inode;
/* File creation time */
struct timespec64 i_crtime;

2
fs/exfat/file.c
View File

@ -413,7 +413,6 @@ int exfat_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
* about to be freed.
*/
inode_dio_wait(inode);
down_write(&EXFAT_I(inode)->truncate_lock);
truncate_setsize(inode, attr->ia_size);
/*
@ -421,7 +420,6 @@ int exfat_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
* is already written by it, so mark_inode_dirty() is unneeded.
*/
exfat_truncate(inode);
up_write(&EXFAT_I(inode)->truncate_lock);
} else
mark_inode_dirty(inode);

5
fs/exfat/inode.c
View File

@ -291,10 +291,9 @@ static sector_t exfat_aop_bmap(struct address_space *mapping, sector_t block)
{
sector_t blocknr;
/* exfat_get_cluster() assumes the requested blocknr isn't truncated. */
down_read(&EXFAT_I(mapping->host)->truncate_lock);
inode_lock_shared(mapping->host);
blocknr = iomap_bmap(mapping, block, &exfat_iomap_ops);
up_read(&EXFAT_I(mapping->host)->truncate_lock);
inode_unlock_shared(mapping->host);
return blocknr;
}

1
fs/exfat/super.c
View File

@ -195,7 +195,6 @@ static struct inode *exfat_alloc_inode(struct super_block *sb)
if (!ei)
return NULL;
init_rwsem(&ei->truncate_lock);
return &ei->vfs_inode;
}