diff options
| author | Jeff Layton <jlayton@kernel.org> | 2025-11-11 09:12:53 -0500 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2025-11-12 09:38:36 +0100 |
| commit | 92bf53577f01aad988f7f39f69163b41f94cfb7d (patch) | |
| tree | d669d11890f438b5bbcdee804eb66681ae311e72 /fs/namei.c | |
| parent | e8960c1b2ee9ba75d65492b8e90e851d11e5f215 (diff) | |
vfs: make vfs_symlink break delegations on parent dir
In order to add directory delegation support, we must break delegations
on the parent on any change to the directory.
Add a delegated_inode parameter to vfs_symlink() and have it break the
delegation. do_symlinkat() can then wait on the delegation break before
proceeding.
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Link: https://patch.msgid.link/20251111-dir-deleg-ro-v6-12-52f3feebb2f2@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'fs/namei.c')
| -rw-r--r-- | fs/namei.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/fs/namei.c b/fs/namei.c index e9616134390f..d5ab28947b2b 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -4845,6 +4845,7 @@ SYSCALL_DEFINE1(unlink, const char __user *, pathname) * @dir: inode of the parent directory * @dentry: dentry of the child symlink file * @oldname: name of the file to link to + * @delegated_inode: returns victim inode, if the inode is delegated. * * Create a symlink. * @@ -4855,7 +4856,8 @@ SYSCALL_DEFINE1(unlink, const char __user *, pathname) * raw inode simply pass @nop_mnt_idmap. */ int vfs_symlink(struct mnt_idmap *idmap, struct inode *dir, - struct dentry *dentry, const char *oldname) + struct dentry *dentry, const char *oldname, + struct delegated_inode *delegated_inode) { int error; @@ -4870,6 +4872,10 @@ int vfs_symlink(struct mnt_idmap *idmap, struct inode *dir, if (error) return error; + error = try_break_deleg(dir, delegated_inode); + if (error) + return error; + error = dir->i_op->symlink(idmap, dir, dentry, oldname); if (!error) fsnotify_create(dir, dentry); @@ -4883,6 +4889,7 @@ int do_symlinkat(struct filename *from, int newdfd, struct filename *to) struct dentry *dentry; struct path path; unsigned int lookup_flags = 0; + struct delegated_inode delegated_inode = { }; if (IS_ERR(from)) { error = PTR_ERR(from); @@ -4897,8 +4904,13 @@ retry: error = security_path_symlink(&path, dentry, from->name); if (!error) error = vfs_symlink(mnt_idmap(path.mnt), path.dentry->d_inode, - dentry, from->name); + dentry, from->name, &delegated_inode); end_creating_path(&path, dentry); + if (is_delegated(&delegated_inode)) { + error = break_deleg_wait(&delegated_inode); + if (!error) + goto retry; + } if (retry_estale(error, lookup_flags)) { lookup_flags |= LOOKUP_REVAL; goto retry; |