[PATCH] VFS: Make d_materialise_unique() enforce directory uniqueness

[karo-tx-linux.git] / fs / nfs / dir.c

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 3419c2da9ba9d25e40dcbc67846ba627477cdad2..27b5a1051b1c91d70bae33ba259a766903b44e16 100644 (file)
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -142,12 +142,12 @@ nfs_opendir(struct inode *inode, struct file *filp)
        return res;
 }
 
-typedef u32 * (*decode_dirent_t)(u32 *, struct nfs_entry *, int);
+typedef __be32 * (*decode_dirent_t)(__be32 *, struct nfs_entry *, int);
 typedef struct {
        struct file     *file;
        struct page     *page;
        unsigned long   page_index;
-       u32             *ptr;
+       __be32          *ptr;
        u64             *dir_cookie;
        loff_t          current_index;
        struct nfs_entry *entry;
@@ -203,8 +203,10 @@ int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page *page)
         * Note: assumes we have exclusive access to this mapping either
         *       through inode->i_mutex or some other mechanism.
         */
-       if (page->index == 0)
-               invalidate_inode_pages2_range(inode->i_mapping, PAGE_CACHE_SIZE, -1);
+       if (page->index == 0 && invalidate_inode_pages2_range(inode->i_mapping, PAGE_CACHE_SIZE, -1) < 0) {
+               /* Should never happen */
+               nfs_zap_mapping(inode, inode->i_mapping);
+       }
        unlock_page(page);
        return 0;
  error:
@@ -218,7 +220,7 @@ int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page *page)
 static inline
 int dir_decode(nfs_readdir_descriptor_t *desc)
 {
-       u32     *p = desc->ptr;
+       __be32  *p = desc->ptr;
        p = desc->decode(p, desc->entry, desc->plus);
        if (IS_ERR(p))
                return PTR_ERR(p);
@@ -843,7 +845,7 @@ static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode)
        nfs_inode_return_delegation(inode);
        if (dentry->d_flags & DCACHE_NFSFS_RENAMED) {
                lock_kernel();
-               inode->i_nlink--;
+               drop_nlink(inode);
                nfs_complete_unlink(dentry);
                unlock_kernel();
        }
@@ -933,8 +935,11 @@ static struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, stru
 
 no_entry:
        res = d_materialise_unique(dentry, inode);
-       if (res != NULL)
+       if (res != NULL) {
+               if (IS_ERR(res))
+                       goto out_unlock;
                dentry = res;
+       }
        nfs_renew_times(dentry);
        nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
 out_unlock:
@@ -1130,6 +1135,8 @@ static struct dentry *nfs_readdir_lookup(nfs_readdir_descriptor_t *desc)
        alias = d_materialise_unique(dentry, inode);
        if (alias != NULL) {
                dput(dentry);
+               if (IS_ERR(alias))
+                       return NULL;
                dentry = alias;
        }
 
@@ -1286,7 +1293,7 @@ static int nfs_rmdir(struct inode *dir, struct dentry *dentry)
        error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name);
        /* Ensure the VFS deletes this inode */
        if (error == 0 && dentry->d_inode != NULL)
-               dentry->d_inode->i_nlink = 0;
+               clear_nlink(dentry->d_inode);
        nfs_end_data_update(dir);
        unlock_kernel();
 
@@ -1401,7 +1408,7 @@ static int nfs_safe_remove(struct dentry *dentry)
                error = NFS_PROTO(dir)->remove(dir, &dentry->d_name);
                /* The VFS may want to delete this inode */
                if (error == 0)
-                       inode->i_nlink--;
+                       drop_nlink(inode);
                nfs_mark_for_revalidate(inode);
                nfs_end_data_update(inode);
        } else
@@ -1517,8 +1524,8 @@ static int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *sym
        pagevec_init(&lru_pvec, 0);
        if (!add_to_page_cache(page, dentry->d_inode->i_mapping, 0,
                                                        GFP_KERNEL)) {
-               if (!pagevec_add(&lru_pvec, page))
-                       __pagevec_lru_add(&lru_pvec);
+               pagevec_add(&lru_pvec, page);
+               pagevec_lru_add(&lru_pvec);
                SetPageUptodate(page);
                unlock_page(page);
        } else
@@ -1639,7 +1646,7 @@ static int nfs_rename(struct inode *old_dir, struct dentry *old_dentry,
                        goto out;
                }
        } else
-               new_inode->i_nlink--;
+               drop_nlink(new_inode);
 
 go_ahead:
        /*
@@ -1669,8 +1676,7 @@ out:
        if (rehash)
                d_rehash(rehash);
        if (!error) {
-               if (!S_ISDIR(old_inode->i_mode))
-                       d_move(old_dentry, new_dentry);
+               d_move(old_dentry, new_dentry);
                nfs_renew_times(new_dentry);
                nfs_set_verifier(new_dentry, nfs_save_change_attribute(new_dir));
        }