diff options
| author | Paulo Alcantara <pc@cjr.nz> | 2022-10-03 18:43:50 -0300 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2022-10-13 09:36:04 -0500 |
| commit | 76894f3e2f71177747b8b4763fb180e800279585 (patch) | |
| tree | d0382d6389d324b5d7421ee960a60af74415b631 /fs/cifs/cifsfs.c | |
| parent | 977bb6530807a9a8e7f29d7dfba5737135b50df6 (diff) | |
cifs: improve symlink handling for smb2+
When creating inode for symlink, the client used to send below
requests to fill it in:
* create+query_info+close (STATUS_STOPPED_ON_SYMLINK)
* create(+reparse_flag)+query_info+close (set file attrs)
* create+ioctl(get_reparse)+close (query reparse tag)
and then for every access to the symlink dentry, the ->link() method
would send another:
* create+ioctl(get_reparse)+close (parse symlink)
So, in order to improve:
(i) Get rid of unnecessary roundtrips and then resolve symlinks as
follows:
* create+query_info+close (STATUS_STOPPED_ON_SYMLINK +
parse symlink + get reparse tag)
* create(+reparse_flag)+query_info+close (set file attrs)
(ii) Set the resolved symlink target directly in inode->i_link and
use simple_get_link() for ->link() to simply return it.
Signed-off-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs/cifs/cifsfs.c')
| -rw-r--r-- | fs/cifs/cifsfs.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c index 8042d7280dec..c6ac19223ddc 100644 --- a/fs/cifs/cifsfs.c +++ b/fs/cifs/cifsfs.c @@ -396,6 +396,7 @@ cifs_alloc_inode(struct super_block *sb) cifs_inode->epoch = 0; spin_lock_init(&cifs_inode->open_file_lock); generate_random_uuid(cifs_inode->lease_key); + cifs_inode->symlink_target = NULL; /* * Can not set i_flags here - they get immediately overwritten to zero @@ -412,7 +413,11 @@ cifs_alloc_inode(struct super_block *sb) static void cifs_free_inode(struct inode *inode) { - kmem_cache_free(cifs_inode_cachep, CIFS_I(inode)); + struct cifsInodeInfo *cinode = CIFS_I(inode); + + if (S_ISLNK(inode->i_mode)) + kfree(cinode->symlink_target); + kmem_cache_free(cifs_inode_cachep, cinode); } static void @@ -1139,7 +1144,7 @@ const struct inode_operations cifs_file_inode_ops = { }; const struct inode_operations cifs_symlink_inode_ops = { - .get_link = cifs_get_link, + .get_link = simple_get_link, .permission = cifs_permission, .listxattr = cifs_listxattr, }; |