github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-11-07 06:17:02 +01:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

exfat: hold the invalidate lock while truncating

Browse Source 
truncate_setsize() ends in truncate_inode_pages(), which is documented
as being "Called under (and serialised by) inode->i_rwsem and
mapping->invalidate_lock".

Hold invalidate_lock while executing truncate_setsize() to ensure that
truncate and mmap writes are mutually exclusive. This can simplify the
handling in exfat_page_mkwrite().

Fixes: 82a81a7352 ("exfat: add iomap buffered I/O support")
Cc: stable@vger.kernel.org
Signed-off-by: Chi Zhiling <chizhiling@kylinos.cn>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
This commit is contained in:
Chi Zhiling 2026-10-04 18:19:31 +08:00 committed by Namjae Jeon
parent b70ab40750
commit 646df471c3
1 changed files with 4 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
fs/exfat/file.c
View File

@ -413,6 +413,7 @@ int exfat_setattr(const struct mnt_idmap *idmap, struct dentry *dentry,
* about to be freed.
*/
inode_dio_wait(inode);
filemap_invalidate_lock(inode->i_mapping);
truncate_setsize(inode, attr->ia_size);
/*
@ -420,6 +421,7 @@ int exfat_setattr(const struct mnt_idmap *idmap, struct dentry *dentry,
* is already written by it, so mark_inode_dirty() is unneeded.
*/
exfat_truncate(inode);
filemap_invalidate_unlock(inode->i_mapping);
} else
mark_inode_dirty(inode);
@ -784,8 +786,10 @@ static int exfat_extend_valid_size(struct inode *inode, loff_t new_valid_size)
ret = exfat_zero_new_range(inode, gap_start, new_valid_size);
filemap_invalidate_unlock(inode->i_mapping);
if (ret) {
filemap_invalidate_lock(inode->i_mapping);
truncate_setsize(inode, old_valid_size);
exfat_truncate(inode);
filemap_invalidate_unlock(inode->i_mapping);
return ret;
}