[PATCH] v9fs: Clean-up vfs_inode and setattr functions

Cleanup code in v9fs vfs_inode as suggested by Alexey Dobriyan.  Did some
major revamping of the v9fs setattr code to remove unnecessary allocations and
clean up some dead-code.

Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 35 insertions, 96 deletions

diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index ef78af7ef04b..6d2357d1dacd 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -1,7 +1,7 @@
 /*
  *  linux/fs/9p/vfs_inode.c
  *
- * This file contians vfs inode ops for the 9P2000 protocol.
+ * This file contains vfs inode ops for the 9P2000 protocol.
  *
  *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
  *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
@@ -54,7 +54,7 @@ static struct inode_operations v9fs_symlink_inode_operations;
  *
  */
 
-static inline int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode)
+static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode)
 {
         int res;
         res = mode & 0777;
@@ -92,7 +92,7 @@ static inline int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode)
  *
  */
 
-static inline int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode)
+static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode)
 {
         int res;
 
@@ -132,7 +132,7 @@ static inline int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode)
  *
  */
 
-static inline void
+static void
 v9fs_blank_mistat(struct v9fs_session_info *v9ses, struct v9fs_stat *mistat)
 {
         mistat->type = ~0;
@@ -160,7 +160,7 @@ v9fs_blank_mistat(struct v9fs_session_info *v9ses, struct v9fs_stat *mistat)
 /**
  * v9fs_mistat2unix - convert mistat to unix stat
  * @mistat: Plan 9 metadata (mistat) structure
- * @stat: unix metadata (stat) structure to populate
+ * @buf: unix metadata (stat) structure to populate
  * @sb: superblock
  *
  */
@@ -177,22 +177,11 @@ v9fs_mistat2unix(struct v9fs_stat *mistat, struct stat *buf,
         buf->st_mtime = mistat->mtime;
         buf->st_ctime = mistat->mtime;
 
-        if (v9ses && v9ses->extended) {
-                /* TODO: string to uid mapping via user-space daemon */
-                buf->st_uid = mistat->n_uid;
-                buf->st_gid = mistat->n_gid;
-
-                sscanf(mistat->uid, "%x", (unsigned int *)&buf->st_uid);
-                sscanf(mistat->gid, "%x", (unsigned int *)&buf->st_gid);
-        } else {
-                buf->st_uid = v9ses->uid;
-                buf->st_gid = v9ses->gid;
-        }
-
         buf->st_uid = (unsigned short)-1;
         buf->st_gid = (unsigned short)-1;
 
         if (v9ses && v9ses->extended) {
+                /* TODO: string to uid mapping via user-space daemon */
                 if (mistat->n_uid != -1)
                         sscanf(mistat->uid, "%x", (unsigned int *)&buf->st_uid);
 
@@ -290,7 +279,7 @@ struct inode *v9fs_get_inode(struct super_block *sb, int mode)
  * @dir: directory inode file is being created in
  * @file_dentry: dentry file is being created in
  * @perm: permissions file is being created with
- * @open_mode: resulting open mode for file ???
+ * @open_mode: resulting open mode for file
  *
  */
 
@@ -434,9 +423,9 @@ v9fs_create(struct inode *dir,
 
 /**
  * v9fs_remove - helper function to remove files and directories
- * @inode: directory inode that is being deleted
- * @dentry:  dentry that is being deleted
- * @rmdir: where we are a file or a directory
+ * @dir: directory inode that is being deleted
+ * @file:  dentry that is being deleted
+ * @rmdir: removing a directory
  *
  */
 
@@ -502,7 +491,7 @@ v9fs_vfs_create(struct inode *inode, struct dentry *dentry, int perm,
 
 /**
  * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
- * @i:  inode that is being unlinked
+ * @inode:  inode that is being unlinked
  * @dentry: dentry that is being unlinked
  * @mode: mode for new directory
  *
@@ -624,7 +613,7 @@ static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
 /**
  * v9fs_vfs_unlink - VFS unlink hook to delete an inode
  * @i:  inode that is being unlinked
- * @dentry: dentry that is being unlinked
+ * @d: dentry that is being unlinked
  *
  */
 
@@ -636,7 +625,7 @@ static int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
 /**
  * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
  * @i:  inode that is being unlinked
- * @dentry: dentry that is being unlinked
+ * @d: dentry that is being unlinked
  *
  */
 
@@ -674,6 +663,9 @@ v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 
         dprintk(DEBUG_VFS, "\n");
 
+        if (!mistat)
+                return -ENOMEM;
+
         if ((!oldfid) || (!olddirfid) || (!newdirfid)) {
                 dprintk(DEBUG_ERROR, "problem with arguments\n");
                 return -EBADF;
@@ -771,20 +763,21 @@ static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
 {
         struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
         struct v9fs_fid *fid = v9fs_fid_lookup(dentry, FID_OP);
-        struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
         struct v9fs_fcall *fcall = NULL;
+        struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
         int res = -EPERM;
 
         dprintk(DEBUG_VFS, "\n");
+
+        if (!mistat)
+                return -ENOMEM;
+
         if (!fid) {
                 dprintk(DEBUG_ERROR,
                         "Couldn't find fid associated with dentry\n");
                 return -EBADF;
         }
 
-        if (!mistat)
-                return -ENOMEM;
-
         v9fs_blank_mistat(v9ses, mistat);
         if (iattr->ia_valid & ATTR_MODE)
                 mistat->mode = unixmode2p9mode(v9ses, iattr->ia_mode);
@@ -799,72 +792,19 @@ static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
                 mistat->length = iattr->ia_size;
 
         if (v9ses->extended) {
-                char *uid = kmalloc(strlen(mistat->uid), GFP_KERNEL);
-                char *gid = kmalloc(strlen(mistat->gid), GFP_KERNEL);
-                char *muid = kmalloc(strlen(mistat->muid), GFP_KERNEL);
-                char *name = kmalloc(strlen(mistat->name), GFP_KERNEL);
-                char *extension = kmalloc(strlen(mistat->extension),
-                                          GFP_KERNEL);
-
-                if ((!uid) || (!gid) || (!muid) || (!name) || (!extension)) {
-                        kfree(uid);
-                        kfree(gid);
-                        kfree(muid);
-                        kfree(name);
-                        kfree(extension);
-
-                        return -ENOMEM;
-                }
-
-                strcpy(uid, mistat->uid);
-                strcpy(gid, mistat->gid);
-                strcpy(muid, mistat->muid);
-                strcpy(name, mistat->name);
-                strcpy(extension, mistat->extension);
+                char *ptr = mistat->data+1;
 
                 if (iattr->ia_valid & ATTR_UID) {
-                        if (strlen(uid) != 8) {
-                                dprintk(DEBUG_ERROR, "uid strlen is %u not 8\n",
-                                        (unsigned int)strlen(uid));
-                                sprintf(uid, "%08x", iattr->ia_uid);
-                        } else {
-                                kfree(uid);
-                                uid = kmalloc(9, GFP_KERNEL);
-                        }
-
-                        sprintf(uid, "%08x", iattr->ia_uid);
+                        mistat->uid = ptr;
+                        ptr += 1+sprintf(ptr, "%08x", iattr->ia_uid);
                         mistat->n_uid = iattr->ia_uid;
                 }
 
                 if (iattr->ia_valid & ATTR_GID) {
-                        if (strlen(gid) != 8)
-                                dprintk(DEBUG_ERROR, "gid strlen is %u not 8\n",
-                                        (unsigned int)strlen(gid));
-                        else {
-                                kfree(gid);
-                                gid = kmalloc(9, GFP_KERNEL);
-                        }
-
-                        sprintf(gid, "%08x", iattr->ia_gid);
+                        mistat->gid = ptr;
+                        ptr += 1+sprintf(ptr, "%08x", iattr->ia_gid);
                         mistat->n_gid = iattr->ia_gid;
                 }
-
-                mistat->uid = mistat->data;
-                strcpy(mistat->uid, uid);
-                mistat->gid = mistat->data + strlen(uid) + 1;
-                strcpy(mistat->gid, gid);
-                mistat->muid = mistat->gid + strlen(gid) + 1;
-                strcpy(mistat->muid, muid);
-                mistat->name = mistat->muid + strlen(muid) + 1;
-                strcpy(mistat->name, name);
-                mistat->extension = mistat->name + strlen(name) + 1;
-                strcpy(mistat->extension, extension);
-
-                kfree(uid);
-                kfree(gid);
-                kfree(muid);
-                kfree(name);
-                kfree(extension);
         }
 
         res = v9fs_t_wstat(v9ses, fid->fid, mistat, &fcall);
@@ -985,17 +925,14 @@ v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
         int retval = -EPERM;
         struct v9fs_fid *newfid;
         struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
-        struct super_block *sb = dir ? dir->i_sb : NULL;
         struct v9fs_fcall *fcall = NULL;
         struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
 
         dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
                 symname);
 
-        if ((!dentry) || (!sb) || (!v9ses)) {
-                dprintk(DEBUG_ERROR, "problem with arguments\n");
-                return -EBADF;
-        }
+        if (!mistat)
+                return -ENOMEM;
 
         if (!v9ses->extended) {
                 dprintk(DEBUG_ERROR, "not extended\n");
@@ -1040,7 +977,7 @@ v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
 /**
  * v9fs_readlink - read a symlink's location (internal version)
  * @dentry: dentry for symlink
- * @buf: buffer to load symlink location into
+ * @buffer: buffer to load symlink location into
  * @buflen: length of buffer
  *
  */
@@ -1179,7 +1116,7 @@ static void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void
  * v9fs_vfs_link - create a hardlink
  * @old_dentry: dentry for file to link to
  * @dir: inode destination for new link
- * @new_dentry: dentry for link
+ * @dentry: dentry for link
  *
  */
 
@@ -1274,6 +1211,9 @@ v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
         dprintk(DEBUG_VFS, " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
                 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
 
+        if (!mistat)
+                return -ENOMEM;
+
         if (!new_valid_dev(rdev)) {
                 retval = -EINVAL;
                 goto FreeMem;
@@ -1302,7 +1242,8 @@ v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
                 sprintf(symname, "b %u %u", MAJOR(rdev), MINOR(rdev));
         else if (S_ISCHR(mode))
                 sprintf(symname, "c %u %u", MAJOR(rdev), MINOR(rdev));
-        else if (S_ISFIFO(mode)) ;      /* DO NOTHING */
+        else if (S_ISFIFO(mode))
+                ;       /* DO NOTHING */
         else {
                 retval = -EINVAL;
                 goto FreeMem;
@@ -1319,8 +1260,6 @@ v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
                                 FCALL_ERROR(fcall));
                         goto FreeMem;
                 }
-
-                kfree(fcall);
         }
 
         /* need to update dcache so we show up */