cifs: refactor new_inode() calls and inode initialization

Move new inode creation into a separate routine and refactor the
callers to take advantage of it.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

3 files changed, 86 insertions, 66 deletions

diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index ec9f9c1c7d88..62fd5bd499f6 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -92,6 +92,8 @@ extern u64 cifs_UnixTimeToNT(struct timespec);
 extern __le64 cnvrtDosCifsTm(__u16 date, __u16 time);
 extern struct timespec cnvrtDosUnixTm(__u16 date, __u16 time);
 
+extern struct inode *cifs_new_inode(struct super_block *sb,
+                                    unsigned long *inum);
 extern int cifs_get_inode_info(struct inode **pinode,
                         const unsigned char *search_path,
                         FILE_ALL_INFO *pfile_info,
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 7342bfb02ae0..c7674f595adb 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -199,6 +199,49 @@ static void fill_fake_finddataunix(FILE_UNIX_BASIC_INFO *pfnd_dat,
         pfnd_dat->Gid = cpu_to_le64(pinode->i_gid);
 }
 
+/**
+ * cifs_new inode - create new inode, initialize, and hash it
+ * @sb - pointer to superblock
+ * @inum - if valid pointer and serverino is enabled, replace i_ino with val
+ *
+ * Create a new inode, initialize it for CIFS and hash it. Returns the new
+ * inode or NULL if one couldn't be allocated.
+ *
+ * If the share isn't mounted with "serverino" or inum is a NULL pointer then
+ * we'll just use the inode number assigned by new_inode(). Note that this can
+ * mean i_ino collisions since the i_ino assigned by new_inode is not
+ * guaranteed to be unique.
+ */
+struct inode *
+cifs_new_inode(struct super_block *sb, unsigned long *inum)
+{
+        struct inode *inode;
+
+        inode = new_inode(sb);
+        if (inode == NULL)
+                return NULL;
+
+        /*
+         * BB: Is i_ino == 0 legal? Here, we assume that it is. If it isn't we
+         *     stop passing inum as ptr. Are there sanity checks we can use to
+         *     ensure that the server is really filling in that field? Also,
+         *     if serverino is disabled, perhaps we should be using iunique()?
+         */
+        if (inum && (CIFS_SB(sb)->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM))
+                inode->i_ino = *inum;
+
+        /*
+         * must set this here instead of cifs_alloc_inode since VFS will
+         * clobber i_flags
+         */
+        if (sb->s_flags & MS_NOATIME)
+                inode->i_flags |= S_NOATIME | S_NOCMTIME;
+
+        insert_inode_hash(inode);
+
+        return inode;
+}
+
 int cifs_get_inode_info_unix(struct inode **pinode,
         const unsigned char *full_path, struct super_block *sb, int xid)
 {
@@ -233,22 +276,12 @@ int cifs_get_inode_info_unix(struct inode **pinode,
 
         /* get new inode */
         if (*pinode == NULL) {
-                *pinode = new_inode(sb);
+                *pinode = cifs_new_inode(sb, (unsigned long *)
+                                                &find_data.UniqueId);
                 if (*pinode == NULL) {
                         rc = -ENOMEM;
                         goto cgiiu_exit;
                 }
-                /* Is an i_ino of zero legal? */
-                /* note ino incremented to unique num in new_inode */
-                /* Are there sanity checks we can use to ensure that
-                   the server is really filling in that field? */
-                if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
-                        (*pinode)->i_ino = (unsigned long)find_data.UniqueId;
-
-                if (sb->s_flags & MS_NOATIME)
-                        (*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
-
-                insert_inode_hash(*pinode);
         }
 
         inode = *pinode;
@@ -465,11 +498,8 @@ int cifs_get_inode_info(struct inode **pinode,
 
         /* get new inode */
         if (*pinode == NULL) {
-                *pinode = new_inode(sb);
-                if (*pinode == NULL) {
-                        rc = -ENOMEM;
-                        goto cgii_exit;
-                }
+                __u64 inode_num;
+
                 /* Is an i_ino of zero legal? Can we use that to check
                    if the server supports returning inode numbers?  Are
                    there other sanity checks we can use to ensure that
@@ -486,7 +516,6 @@ int cifs_get_inode_info(struct inode **pinode,
 
                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
                         int rc1 = 0;
-                        __u64 inode_num;
 
                         rc1 = CIFSGetSrvInodeNumber(xid, pTcon,
                                         full_path, &inode_num,
@@ -496,12 +525,17 @@ int cifs_get_inode_info(struct inode **pinode,
                         if (rc1) {
                                 cFYI(1, ("GetSrvInodeNum rc %d", rc1));
                                 /* BB EOPNOSUPP disable SERVER_INUM? */
-                        } else /* do we need cast or hash to ino? */
-                                (*pinode)->i_ino = inode_num;
-                } /* else ino incremented to unique num in new_inode*/
-                if (sb->s_flags & MS_NOATIME)
-                        (*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
-                insert_inode_hash(*pinode);
+                        }
+                        *pinode = cifs_new_inode(sb, (unsigned long *)
+                                                        &inode_num);
+                } else {
+                        *pinode = cifs_new_inode(sb, NULL);
+                }
+
+                if (*pinode == NULL) {
+                        rc = -ENOMEM;
+                        goto cgii_exit;
+                }
         }
         inode = *pinode;
         cifsInfo = CIFS_I(inode);
@@ -1114,24 +1148,14 @@ int cifs_mkdir(struct inode *inode, struct dentry *direntry, int mode)
                         else
                                 direntry->d_op = &cifs_dentry_ops;
 
-                        newinode = new_inode(inode->i_sb);
+                        newinode = cifs_new_inode(inode->i_sb, (unsigned long *)
+                                                        &pInfo->UniqueId);
                         if (newinode == NULL) {
                                 kfree(pInfo);
                                 goto mkdir_get_info;
                         }
 
-                        /* Is an i_ino of zero legal? */
-                        /* Are there sanity checks we can use to ensure that
-                           the server is really filling in that field? */
-                        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
-                                newinode->i_ino =
-                                        (unsigned long)pInfo->UniqueId;
-                        } /* note ino incremented to unique num in new_inode */
-                        if (inode->i_sb->s_flags & MS_NOATIME)
-                                newinode->i_flags |= S_NOATIME | S_NOCMTIME;
                         newinode->i_nlink = 2;
-
-                        insert_inode_hash(newinode);
                         d_instantiate(direntry, newinode);
 
                         /* we already checked in POSIXCreate whether
diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
index 9f51f9bf0292..02a20221e841 100644
--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -56,35 +56,34 @@ static inline void dump_cifs_file_struct(struct file *file, char *label)
 }
 #endif /* DEBUG2 */
 
-/* Returns one if new inode created (which therefore needs to be hashed) */
+/* Returns 1 if new inode created, 2 if both dentry and inode were */
 /* Might check in the future if inode number changed so we can rehash inode */
-static int construct_dentry(struct qstr *qstring, struct file *file,
-        struct inode **ptmp_inode, struct dentry **pnew_dentry)
+static int
+construct_dentry(struct qstr *qstring, struct file *file,
+                 struct inode **ptmp_inode, struct dentry **pnew_dentry,
+                 unsigned long *inum)
 {
-        struct dentry *tmp_dentry;
-        struct cifs_sb_info *cifs_sb;
-        struct cifsTconInfo *pTcon;
+        struct dentry *tmp_dentry = NULL;
+        struct super_block *sb = file->f_path.dentry->d_sb;
         int rc = 0;
 
         cFYI(1, ("For %s", qstring->name));
-        cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
-        pTcon = cifs_sb->tcon;
 
         qstring->hash = full_name_hash(qstring->name, qstring->len);
         tmp_dentry = d_lookup(file->f_path.dentry, qstring);
         if (tmp_dentry) {
+                /* BB: overwrite old name? i.e. tmp_dentry->d_name and
+                 * tmp_dentry->d_name.len??
+                 */
                 cFYI(0, ("existing dentry with inode 0x%p",
                          tmp_dentry->d_inode));
                 *ptmp_inode = tmp_dentry->d_inode;
-/* BB overwrite old name? i.e. tmp_dentry->d_name and tmp_dentry->d_name.len??*/
                 if (*ptmp_inode == NULL) {
-                        *ptmp_inode = new_inode(file->f_path.dentry->d_sb);
+                        *ptmp_inode = cifs_new_inode(sb, inum);
                         if (*ptmp_inode == NULL)
                                 return rc;
                         rc = 1;
                 }
-                if (file->f_path.dentry->d_sb->s_flags & MS_NOATIME)
-                        (*ptmp_inode)->i_flags |= S_NOATIME | S_NOCMTIME;
         } else {
                 tmp_dentry = d_alloc(file->f_path.dentry, qstring);
                 if (tmp_dentry == NULL) {
@@ -93,15 +92,14 @@ static int construct_dentry(struct qstr *qstring, struct file *file,
                         return rc;
                 }
 
-                *ptmp_inode = new_inode(file->f_path.dentry->d_sb);
-                if (pTcon->nocase)
+                if (CIFS_SB(sb)->tcon->nocase)
                         tmp_dentry->d_op = &cifs_ci_dentry_ops;
                 else
                         tmp_dentry->d_op = &cifs_dentry_ops;
+
+                *ptmp_inode = cifs_new_inode(sb, inum);
                 if (*ptmp_inode == NULL)
                         return rc;
-                if (file->f_path.dentry->d_sb->s_flags & MS_NOATIME)
-                        (*ptmp_inode)->i_flags |= S_NOATIME | S_NOCMTIME;
                 rc = 2;
         }
 
@@ -842,9 +840,7 @@ static int cifs_get_name_from_search_buf(struct qstr *pqst,
                         len = strnlen(filename, PATH_MAX);
                 }
 
-                /* BB fixme - hash low and high 32 bits if not 64 bit arch BB */
-                if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
-                        *pinum = pFindData->UniqueId;
+                *pinum = pFindData->UniqueId;
         } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
                 FILE_DIRECTORY_INFO *pFindData =
                         (FILE_DIRECTORY_INFO *)current_entry;
@@ -940,20 +936,18 @@ static int cifs_filldir(char *pfindEntry, struct file *file,
         if (rc)
                 return rc;
 
-        rc = construct_dentry(&qstring, file, &tmp_inode, &tmp_dentry);
+        /* only these two infolevels return valid inode numbers */
+        if (pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX ||
+            pCifsF->srch_inf.info_level == SMB_FIND_FILE_ID_FULL_DIR_INFO)
+                rc = construct_dentry(&qstring, file, &tmp_inode, &tmp_dentry,
+                                        &inum);
+        else
+                rc = construct_dentry(&qstring, file, &tmp_inode, &tmp_dentry,
+                                        NULL);
+
         if ((tmp_inode == NULL) || (tmp_dentry == NULL))
                 return -ENOMEM;
 
-        if (rc) {
-                /* inode created, we need to hash it with right inode number */
-                if (inum != 0) {
-                        /* BB fixme - hash the 2 32 quantities bits together if
-                         *  necessary BB */
-                        tmp_inode->i_ino = inum;
-                }
-                insert_inode_hash(tmp_inode);
-        }
-
         /* we pass in rc below, indicating whether it is a new inode,
            so we can figure out whether to invalidate the inode cached
            data if the file has changed */