Merge git://git.skbuff.net/gitroot/yoshfuji/linux-2.6-git-rfc3542

[pandora-kernel.git] / fs / namei.c

diff --git a/fs/namei.c b/fs/namei.c
index 1d93cb4..145e852 100644 (file)
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -21,7 +21,7 @@
 #include <linux/namei.h>
 #include <linux/quotaops.h>
 #include <linux/pagemap.h>
-#include <linux/dnotify.h>
+#include <linux/fsnotify.h>
 #include <linux/smp_lock.h>
 #include <linux/personality.h>
 #include <linux/security.h>
@@ -501,6 +501,7 @@ struct path {
 static inline int __do_follow_link(struct path *path, struct nameidata *nd)
 {
        int error;
+       void *cookie;
        struct dentry *dentry = path->dentry;
 
        touch_atime(path->mnt, dentry);
@@ -508,13 +509,15 @@ static inline int __do_follow_link(struct path *path, struct nameidata *nd)
 
        if (path->mnt == nd->mnt)
                mntget(path->mnt);
-       error = dentry->d_inode->i_op->follow_link(dentry, nd);
-       if (!error) {
+       cookie = dentry->d_inode->i_op->follow_link(dentry, nd);
+       error = PTR_ERR(cookie);
+       if (!IS_ERR(cookie)) {
                char *s = nd_get_link(nd);
+               error = 0;
                if (s)
                        error = __vfs_follow_link(nd, s);
                if (dentry->d_inode->i_op->put_link)
-                       dentry->d_inode->i_op->put_link(dentry, nd);
+                       dentry->d_inode->i_op->put_link(dentry, nd, cookie);
        }
        dput(dentry);
        mntput(path->mnt);
@@ -522,6 +525,22 @@ static inline int __do_follow_link(struct path *path, struct nameidata *nd)
        return error;
 }
 
+static inline void dput_path(struct path *path, struct nameidata *nd)
+{
+       dput(path->dentry);
+       if (path->mnt != nd->mnt)
+               mntput(path->mnt);
+}
+
+static inline void path_to_nameidata(struct path *path, struct nameidata *nd)
+{
+       dput(nd->dentry);
+       if (nd->mnt != path->mnt)
+               mntput(nd->mnt);
+       nd->mnt = path->mnt;
+       nd->dentry = path->dentry;
+}
+
 /*
  * This limits recursive symlink follows to 8, while
  * limiting consecutive symlinks to 40.
@@ -549,9 +568,7 @@ static inline int do_follow_link(struct path *path, struct nameidata *nd)
        nd->depth--;
        return err;
 loop:
-       dput(path->dentry);
-       if (path->mnt != nd->mnt)
-               mntput(path->mnt);
+       dput_path(path, nd);
        path_release(nd);
        return err;
 }
@@ -810,13 +827,8 @@ static fastcall int __link_path_walk(const char * name, struct nameidata *nd)
                        err = -ENOTDIR; 
                        if (!inode->i_op)
                                break;
-               } else {
-                       dput(nd->dentry);
-                       if (nd->mnt != next.mnt)
-                               mntput(nd->mnt);
-                       nd->mnt = next.mnt;
-                       nd->dentry = next.dentry;
-               }
+               } else
+                       path_to_nameidata(&next, nd);
                err = -ENOTDIR; 
                if (!inode->i_op->lookup)
                        break;
@@ -856,13 +868,8 @@ last_component:
                        if (err)
                                goto return_err;
                        inode = nd->dentry->d_inode;
-               } else {
-                       dput(nd->dentry);
-                       if (nd->mnt != next.mnt)
-                               mntput(nd->mnt);
-                       nd->mnt = next.mnt;
-                       nd->dentry = next.dentry;
-               }
+               } else
+                       path_to_nameidata(&next, nd);
                err = -ENOENT;
                if (!inode)
                        break;
@@ -898,9 +905,7 @@ return_reval:
 return_base:
                return 0;
 out_dput:
-               dput(next.dentry);
-               if (nd->mnt != next.mnt)
-                       mntput(next.mnt);
+               dput_path(&next, nd);
                break;
        }
        path_release(nd);
@@ -1312,7 +1317,7 @@ int vfs_create(struct inode *dir, struct dentry *dentry, int mode,
        DQUOT_INIT(dir);
        error = dir->i_op->create(dir, dentry, mode, nd);
        if (!error) {
-               inode_dir_notify(dir, DN_CREATE);
+               fsnotify_create(dir, dentry->d_name.name);
                security_inode_post_create(dir, dentry, mode);
        }
        return error;
@@ -1504,11 +1509,7 @@ do_last:
        if (path.dentry->d_inode->i_op && path.dentry->d_inode->i_op->follow_link)
                goto do_link;
 
-       dput(nd->dentry);
-       nd->dentry = path.dentry;
-       if (nd->mnt != path.mnt)
-               mntput(nd->mnt);
-       nd->mnt = path.mnt;
+       path_to_nameidata(&path, nd);
        error = -EISDIR;
        if (path.dentry->d_inode && S_ISDIR(path.dentry->d_inode->i_mode))
                goto exit;
@@ -1519,9 +1520,7 @@ ok:
        return 0;
 
 exit_dput:
-       dput(path.dentry);
-       if (nd->mnt != path.mnt)
-               mntput(path.mnt);
+       dput_path(&path, nd);
 exit:
        path_release(nd);
        return error;
@@ -1637,7 +1636,7 @@ int vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
        DQUOT_INIT(dir);
        error = dir->i_op->mknod(dir, dentry, mode, dev);
        if (!error) {
-               inode_dir_notify(dir, DN_CREATE);
+               fsnotify_create(dir, dentry->d_name.name);
                security_inode_post_mknod(dir, dentry, mode, dev);
        }
        return error;
@@ -1710,7 +1709,7 @@ int vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
        DQUOT_INIT(dir);
        error = dir->i_op->mkdir(dir, dentry, mode);
        if (!error) {
-               inode_dir_notify(dir, DN_CREATE);
+               fsnotify_mkdir(dir, dentry->d_name.name);
                security_inode_post_mkdir(dir,dentry, mode);
        }
        return error;
@@ -1801,7 +1800,6 @@ int vfs_rmdir(struct inode *dir, struct dentry *dentry)
        }
        up(&dentry->d_inode->i_sem);
        if (!error) {
-               inode_dir_notify(dir, DN_DELETE);
                d_delete(dentry);
        }
        dput(dentry);
@@ -1875,8 +1873,8 @@ int vfs_unlink(struct inode *dir, struct dentry *dentry)
        /* We don't d_delete() NFS sillyrenamed files--they still exist. */
        if (!error && !(dentry->d_flags & DCACHE_NFSFS_RENAMED)) {
                d_delete(dentry);
-               inode_dir_notify(dir, DN_DELETE);
        }
+
        return error;
 }
 
@@ -1950,7 +1948,7 @@ int vfs_symlink(struct inode *dir, struct dentry *dentry, const char *oldname, i
        DQUOT_INIT(dir);
        error = dir->i_op->symlink(dir, dentry, oldname);
        if (!error) {
-               inode_dir_notify(dir, DN_CREATE);
+               fsnotify_create(dir, dentry->d_name.name);
                security_inode_post_symlink(dir, dentry, oldname);
        }
        return error;
@@ -2023,7 +2021,7 @@ int vfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_de
        error = dir->i_op->link(old_dentry, dir, new_dentry);
        up(&old_dentry->d_inode->i_sem);
        if (!error) {
-               inode_dir_notify(dir, DN_CREATE);
+               fsnotify_create(dir, new_dentry->d_name.name);
                security_inode_post_link(old_dentry, dir, new_dentry);
        }
        return error;
@@ -2187,6 +2185,7 @@ int vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 {
        int error;
        int is_dir = S_ISDIR(old_dentry->d_inode->i_mode);
+       const char *old_name;
 
        if (old_dentry->d_inode == new_dentry->d_inode)
                return 0;
@@ -2208,18 +2207,19 @@ int vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
        DQUOT_INIT(old_dir);
        DQUOT_INIT(new_dir);
 
+       old_name = fsnotify_oldname_init(old_dentry->d_name.name);
+
        if (is_dir)
                error = vfs_rename_dir(old_dir,old_dentry,new_dir,new_dentry);
        else
                error = vfs_rename_other(old_dir,old_dentry,new_dir,new_dentry);
        if (!error) {
-               if (old_dir == new_dir)
-                       inode_dir_notify(old_dir, DN_RENAME);
-               else {
-                       inode_dir_notify(old_dir, DN_DELETE);
-                       inode_dir_notify(new_dir, DN_CREATE);
-               }
+               const char *new_name = old_dentry->d_name.name;
+               fsnotify_move(old_dir, new_dir, old_name, new_name, is_dir,
+                             new_dentry->d_inode, old_dentry->d_inode);
        }
+       fsnotify_oldname_free(old_name);
+
        return error;
 }
 
@@ -2343,15 +2343,17 @@ out:
 int generic_readlink(struct dentry *dentry, char __user *buffer, int buflen)
 {
        struct nameidata nd;
-       int res;
+       void *cookie;
+
        nd.depth = 0;
-       res = dentry->d_inode->i_op->follow_link(dentry, &nd);
-       if (!res) {
-               res = vfs_readlink(dentry, buffer, buflen, nd_get_link(&nd));
+       cookie = dentry->d_inode->i_op->follow_link(dentry, &nd);
+       if (!IS_ERR(cookie)) {
+               int res = vfs_readlink(dentry, buffer, buflen, nd_get_link(&nd));
                if (dentry->d_inode->i_op->put_link)
-                       dentry->d_inode->i_op->put_link(dentry, &nd);
+                       dentry->d_inode->i_op->put_link(dentry, &nd, cookie);
+               cookie = ERR_PTR(res);
        }
-       return res;
+       return PTR_ERR(cookie);
 }
 
 int vfs_follow_link(struct nameidata *nd, const char *link)
@@ -2394,23 +2396,20 @@ int page_readlink(struct dentry *dentry, char __user *buffer, int buflen)
        return res;
 }
 
-int page_follow_link_light(struct dentry *dentry, struct nameidata *nd)
+void *page_follow_link_light(struct dentry *dentry, struct nameidata *nd)
 {
-       struct page *page;
+       struct page *page = NULL;
        nd_set_link(nd, page_getlink(dentry, &page));
-       return 0;
+       return page;
 }
 
-void page_put_link(struct dentry *dentry, struct nameidata *nd)
+void page_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie)
 {
-       if (!IS_ERR(nd_get_link(nd))) {
-               struct page *page;
-               page = find_get_page(dentry->d_inode->i_mapping, 0);
-               if (!page)
-                       BUG();
+       struct page *page = cookie;
+
+       if (page) {
                kunmap(page);
                page_cache_release(page);
-               page_cache_release(page);
        }
 }