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Merge patch series "fs: add iput_not_last()"

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Add iput_not_last() and switch landlock over to it to remove
false-positives from might_sleep() annotations in iput().

Link: https://patch.msgid.link/20251105212025.807549-1-mjguzik@gmail.com

* patches from https://patch.msgid.link/20251105212025.807549-1-mjguzik@gmail.com:
  landlock: fix splats from iput() after it started calling might_sleep()
  fs: add iput_not_last()

Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner
2025-11-12 10:47:52 +01:00
parent 3cd1548a27 56325e8c68
commit e9d50b78fd
3 changed files with 16 additions and 4 deletions
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12
fs/inode.c
View File

@@ -1967,6 +1967,18 @@ retry:
}
EXPORT_SYMBOL(iput);
/**
* iput_not_last - put an inode assuming this is not the last reference
* @inode: inode to put
*/
void iput_not_last(struct inode *inode)
{
VFS_BUG_ON_INODE(atomic_read(&inode->i_count) < 2, inode);
WARN_ON(atomic_sub_return(1, &inode->i_count) == 0);
}
EXPORT_SYMBOL(iput_not_last);
#ifdef CONFIG_BLOCK
/**
* bmap - find a block number in a file

1
include/linux/fs.h
View File

@@ -2824,6 +2824,7 @@ extern int current_umask(void);
extern void ihold(struct inode * inode);
extern void iput(struct inode *);
void iput_not_last(struct inode *);
int inode_update_timestamps(struct inode *inode, int flags);
int generic_update_time(struct inode *, int);

7
security/landlock/fs.c
View File

@@ -1335,11 +1335,10 @@ static void hook_sb_delete(struct super_block *const sb)
* At this point, we own the ihold() reference that was
* originally set up by get_inode_object() and the
* __iget() reference that we just set in this loop
* walk. Therefore the following call to iput() will
* not sleep nor drop the inode because there is now at
* least two references to it.
* walk. Therefore there are at least two references
* on the inode.
*/
iput(inode);
iput_not_last(inode);
} else {
spin_unlock(&object->lock);
rcu_read_unlock();