cifs: add new cifs_iget function and convert unix codepath to use it

cifs: add new cifs_iget function and convert unix codepath to use it

In order to unify some codepaths, introduce a common cifs_fattr struct
for storing inode attributes. The different codepaths (unix, legacy,
normal, etc...) can fill out this struct with inode info. It can then be
passed as an arg to a common set of routines to get and update inodes.

Add a new cifs_iget function that uses iget5_locked to identify inodes.
This will compare inodes based on the uniqueid value in a cifs_fattr
struct.

Rather than filling out an already-created inode, have
cifs_get_inode_info_unix instead fill out cifs_fattr and hand that off
to cifs_iget. cifs_iget can then properly look for hardlinked inodes.

On the readdir side, add a new cifs_readdir_lookup function that spawns
populated dentries. Redefine FILE_UNIX_INFO so that it's basically a
FILE_UNIX_BASIC_INFO that has a few fields wrapped around it. This
allows us to more easily use the same function for filling out the fattr
as the non-readdir codepath.

With this, we should then have proper hardlink detection and can
eventually get rid of some nasty CIFS-specific hacks for handing them.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 11 insertions, 11 deletions

diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index 7dc6b74f9def..a40054faed7f 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -188,6 +188,7 @@ int cifs_posix_open(char *full_path, struct inode **pinode,
         FILE_UNIX_BASIC_INFO *presp_data;
         __u32 posix_flags = 0;
         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+        struct cifs_fattr fattr;
 
         cFYI(1, ("posix open %s", full_path));
 
@@ -236,22 +237,21 @@ int cifs_posix_open(char *full_path, struct inode **pinode,
         if (presp_data->Type == cpu_to_le32(-1))
                 goto posix_open_ret; /* open ok, caller does qpathinfo */
 
-        /* get new inode and set it up */
         if (!pinode)
                 goto posix_open_ret; /* caller does not need info */
 
+        cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb);
+
+        /* get new inode and set it up */
         if (*pinode == NULL) {
-                __u64 unique_id = le64_to_cpu(presp_data->UniqueId);
-                *pinode = cifs_new_inode(sb, &unique_id);
+                *pinode = cifs_iget(sb, &fattr);
+                if (!*pinode) {
+                        rc = -ENOMEM;
+                        goto posix_open_ret;
+                }
+        } else {
+                cifs_fattr_to_inode(*pinode, &fattr);
         }
-        /* else an inode was passed in. Update its info, don't create one */
-
-        /* We do not need to close the file if new_inode fails since
-           the caller will retry qpathinfo as long as inode is null */
-        if (*pinode == NULL)
-                goto posix_open_ret;
-
-        posix_fill_in_inode(*pinode, presp_data, 1);
 
         cifs_fill_fileinfo(*pinode, *pnetfid, cifs_sb->tcon, write_only);