1 files changed, 194 insertions, 167 deletions

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 603e4ebbd0ac..426211882f72 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -53,7 +53,7 @@ static struct buffer_head *ext4_append(handle_t *handle,
                                         ext4_lblk_t *block)
 {
         struct buffer_head *bh;
-        int err = 0;
+        int err;
 
         if (unlikely(EXT4_SB(inode->i_sb)->s_max_dir_size_kb &&
                      ((inode->i_size >> 10) >=
@@ -62,9 +62,9 @@ static struct buffer_head *ext4_append(handle_t *handle,
 
         *block = inode->i_size >> inode->i_sb->s_blocksize_bits;
 
-        bh = ext4_bread(handle, inode, *block, 1, &err);
-        if (!bh)
-                return ERR_PTR(err);
+        bh = ext4_bread(handle, inode, *block, 1);
+        if (IS_ERR(bh))
+                return bh;
         inode->i_size += inode->i_sb->s_blocksize;
         EXT4_I(inode)->i_disksize = inode->i_size;
         BUFFER_TRACE(bh, "get_write_access");
@@ -94,20 +94,20 @@ static struct buffer_head *__ext4_read_dirblock(struct inode *inode,
 {
         struct buffer_head *bh;
         struct ext4_dir_entry *dirent;
-        int err = 0, is_dx_block = 0;
+        int is_dx_block = 0;
 
-        bh = ext4_bread(NULL, inode, block, 0, &err);
-        if (!bh) {
-                if (err == 0) {
-                        ext4_error_inode(inode, __func__, line, block,
-                                               "Directory hole found");
-                        return ERR_PTR(-EIO);
-                }
+        bh = ext4_bread(NULL, inode, block, 0);
+        if (IS_ERR(bh)) {
                 __ext4_warning(inode->i_sb, __func__, line,
-                               "error reading directory block "
-                               "(ino %lu, block %lu)", inode->i_ino,
+                               "error %ld reading directory block "
+                               "(ino %lu, block %lu)", PTR_ERR(bh), inode->i_ino,
                                (unsigned long) block);
-                return ERR_PTR(err);
+
+                return bh;
+        }
+        if (!bh) {
+                ext4_error_inode(inode, __func__, line, block, "Directory hole found");
+                return ERR_PTR(-EIO);
         }
         dirent = (struct ext4_dir_entry *) bh->b_data;
         /* Determine whether or not we have an index block */
@@ -124,8 +124,7 @@ static struct buffer_head *__ext4_read_dirblock(struct inode *inode,
                        "directory leaf block found instead of index block");
                 return ERR_PTR(-EIO);
         }
-        if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
-                                        EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) ||
+        if (!ext4_has_metadata_csum(inode->i_sb) ||
             buffer_verified(bh))
                 return bh;
 
@@ -253,8 +252,7 @@ static unsigned dx_node_limit(struct inode *dir);
 static struct dx_frame *dx_probe(const struct qstr *d_name,
                                  struct inode *dir,
                                  struct dx_hash_info *hinfo,
-                                 struct dx_frame *frame,
-                                 int *err);
+                                 struct dx_frame *frame);
 static void dx_release(struct dx_frame *frames);
 static int dx_make_map(struct ext4_dir_entry_2 *de, unsigned blocksize,
                        struct dx_hash_info *hinfo, struct dx_map_entry map[]);
@@ -270,8 +268,7 @@ static int ext4_htree_next_block(struct inode *dir, __u32 hash,
                                  __u32 *start_hash);
 static struct buffer_head * ext4_dx_find_entry(struct inode *dir,
                 const struct qstr *d_name,
-                struct ext4_dir_entry_2 **res_dir,
-                int *err);
+                struct ext4_dir_entry_2 **res_dir);
 static int ext4_dx_add_entry(handle_t *handle, struct dentry *dentry,
                              struct inode *inode);
 
@@ -340,8 +337,7 @@ int ext4_dirent_csum_verify(struct inode *inode, struct ext4_dir_entry *dirent)
 {
         struct ext4_dir_entry_tail *t;
 
-        if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
-                                        EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+        if (!ext4_has_metadata_csum(inode->i_sb))
                 return 1;
 
         t = get_dirent_tail(inode, dirent);
@@ -362,8 +358,7 @@ static void ext4_dirent_csum_set(struct inode *inode,
 {
         struct ext4_dir_entry_tail *t;
 
-        if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
-                                        EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+        if (!ext4_has_metadata_csum(inode->i_sb))
                 return;
 
         t = get_dirent_tail(inode, dirent);
@@ -438,8 +433,7 @@ static int ext4_dx_csum_verify(struct inode *inode,
         struct dx_tail *t;
         int count_offset, limit, count;
 
-        if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
-                                        EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+        if (!ext4_has_metadata_csum(inode->i_sb))
                 return 1;
 
         c = get_dx_countlimit(inode, dirent, &count_offset);
@@ -468,8 +462,7 @@ static void ext4_dx_csum_set(struct inode *inode, struct ext4_dir_entry *dirent)
         struct dx_tail *t;
         int count_offset, limit, count;
 
-        if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
-                                        EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+        if (!ext4_has_metadata_csum(inode->i_sb))
                 return;
 
         c = get_dx_countlimit(inode, dirent, &count_offset);
@@ -557,8 +550,7 @@ static inline unsigned dx_root_limit(struct inode *dir, unsigned infosize)
         unsigned entry_space = dir->i_sb->s_blocksize - EXT4_DIR_REC_LEN(1) -
                 EXT4_DIR_REC_LEN(2) - infosize;
 
-        if (EXT4_HAS_RO_COMPAT_FEATURE(dir->i_sb,
-                                       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+        if (ext4_has_metadata_csum(dir->i_sb))
                 entry_space -= sizeof(struct dx_tail);
         return entry_space / sizeof(struct dx_entry);
 }
@@ -567,8 +559,7 @@ static inline unsigned dx_node_limit(struct inode *dir)
 {
         unsigned entry_space = dir->i_sb->s_blocksize - EXT4_DIR_REC_LEN(0);
 
-        if (EXT4_HAS_RO_COMPAT_FEATURE(dir->i_sb,
-                                       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+        if (ext4_has_metadata_csum(dir->i_sb))
                 entry_space -= sizeof(struct dx_tail);
         return entry_space / sizeof(struct dx_entry);
 }
@@ -641,7 +632,9 @@ struct stats dx_show_entries(struct dx_hash_info *hinfo, struct inode *dir,
                 u32 range = i < count - 1? (dx_get_hash(entries + 1) - hash): ~hash;
                 struct stats stats;
                 printk("%s%3u:%03u hash %8x/%8x ",levels?"":"   ", i, block, hash, range);
-                if (!(bh = ext4_bread (NULL,dir, block, 0,&err))) continue;
+                bh = ext4_bread(NULL,dir, block, 0);
+                if (!bh || IS_ERR(bh))
+                        continue;
                 stats = levels?
                    dx_show_entries(hinfo, dir, ((struct dx_node *) bh->b_data)->entries, levels - 1):
                    dx_show_leaf(hinfo, (struct ext4_dir_entry_2 *) bh->b_data, blocksize, 0);
@@ -669,29 +662,25 @@ struct stats dx_show_entries(struct dx_hash_info *hinfo, struct inode *dir,
  */
 static struct dx_frame *
 dx_probe(const struct qstr *d_name, struct inode *dir,
-         struct dx_hash_info *hinfo, struct dx_frame *frame_in, int *err)
+         struct dx_hash_info *hinfo, struct dx_frame *frame_in)
 {
         unsigned count, indirect;
         struct dx_entry *at, *entries, *p, *q, *m;
         struct dx_root *root;
-        struct buffer_head *bh;
         struct dx_frame *frame = frame_in;
+        struct dx_frame *ret_err = ERR_PTR(ERR_BAD_DX_DIR);
         u32 hash;
 
-        frame->bh = NULL;
-        bh = ext4_read_dirblock(dir, 0, INDEX);
-        if (IS_ERR(bh)) {
-                *err = PTR_ERR(bh);
-                goto fail;
-        }
-        root = (struct dx_root *) bh->b_data;
+        frame->bh = ext4_read_dirblock(dir, 0, INDEX);
+        if (IS_ERR(frame->bh))
+                return (struct dx_frame *) frame->bh;
+
+        root = (struct dx_root *) frame->bh->b_data;
         if (root->info.hash_version != DX_HASH_TEA &&
             root->info.hash_version != DX_HASH_HALF_MD4 &&
             root->info.hash_version != DX_HASH_LEGACY) {
                 ext4_warning(dir->i_sb, "Unrecognised inode hash code %d",
                              root->info.hash_version);
-                brelse(bh);
-                *err = ERR_BAD_DX_DIR;
                 goto fail;
         }
         hinfo->hash_version = root->info.hash_version;
@@ -705,16 +694,12 @@ dx_probe(const struct qstr *d_name, struct inode *dir,
         if (root->info.unused_flags & 1) {
                 ext4_warning(dir->i_sb, "Unimplemented inode hash flags: %#06x",
                              root->info.unused_flags);
-                brelse(bh);
-                *err = ERR_BAD_DX_DIR;
                 goto fail;
         }
 
         if ((indirect = root->info.indirect_levels) > 1) {
                 ext4_warning(dir->i_sb, "Unimplemented inode hash depth: %#06x",
                              root->info.indirect_levels);
-                brelse(bh);
-                *err = ERR_BAD_DX_DIR;
                 goto fail;
         }
 
@@ -724,27 +709,21 @@ dx_probe(const struct qstr *d_name, struct inode *dir,
         if (dx_get_limit(entries) != dx_root_limit(dir,
                                                    root->info.info_length)) {
                 ext4_warning(dir->i_sb, "dx entry: limit != root limit");
-                brelse(bh);
-                *err = ERR_BAD_DX_DIR;
                 goto fail;
         }
 
         dxtrace(printk("Look up %x", hash));
-        while (1)
-        {
+        while (1) {
                 count = dx_get_count(entries);
                 if (!count || count > dx_get_limit(entries)) {
                         ext4_warning(dir->i_sb,
                                      "dx entry: no count or count > limit");
-                        brelse(bh);
-                        *err = ERR_BAD_DX_DIR;
-                        goto fail2;
+                        goto fail;
                 }
 
                 p = entries + 1;
                 q = entries + count - 1;
-                while (p <= q)
-                {
+                while (p <= q) {
                         m = p + (q - p)/2;
                         dxtrace(printk("."));
                         if (dx_get_hash(m) > hash)
@@ -753,8 +732,7 @@ dx_probe(const struct qstr *d_name, struct inode *dir,
                                 p = m + 1;
                 }
 
-                if (0) // linear search cross check
-                {
+                if (0) { // linear search cross check
                         unsigned n = count - 1;
                         at = entries;
                         while (n--)
@@ -771,38 +749,35 @@ dx_probe(const struct qstr *d_name, struct inode *dir,
 
                 at = p - 1;
                 dxtrace(printk(" %x->%u\n", at == entries? 0: dx_get_hash(at), dx_get_block(at)));
-                frame->bh = bh;
                 frame->entries = entries;
                 frame->at = at;
-                if (!indirect--) return frame;
-                bh = ext4_read_dirblock(dir, dx_get_block(at), INDEX);
-                if (IS_ERR(bh)) {
-                        *err = PTR_ERR(bh);
-                        goto fail2;
+                if (!indirect--)
+                        return frame;
+                frame++;
+                frame->bh = ext4_read_dirblock(dir, dx_get_block(at), INDEX);
+                if (IS_ERR(frame->bh)) {
+                        ret_err = (struct dx_frame *) frame->bh;
+                        frame->bh = NULL;
+                        goto fail;
                 }
-                entries = ((struct dx_node *) bh->b_data)->entries;
+                entries = ((struct dx_node *) frame->bh->b_data)->entries;
 
                 if (dx_get_limit(entries) != dx_node_limit (dir)) {
                         ext4_warning(dir->i_sb,
                                      "dx entry: limit != node limit");
-                        brelse(bh);
-                        *err = ERR_BAD_DX_DIR;
-                        goto fail2;
+                        goto fail;
                 }
-                frame++;
-                frame->bh = NULL;
         }
-fail2:
+fail:
         while (frame >= frame_in) {
                 brelse(frame->bh);
                 frame--;
         }
-fail:
-        if (*err == ERR_BAD_DX_DIR)
+        if (ret_err == ERR_PTR(ERR_BAD_DX_DIR))
                 ext4_warning(dir->i_sb,
                              "Corrupt dir inode %lu, running e2fsck is "
                              "recommended.", dir->i_ino);
-        return NULL;
+        return ret_err;
 }
 
 static void dx_release (struct dx_frame *frames)
@@ -988,9 +963,9 @@ int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
         }
         hinfo.hash = start_hash;
         hinfo.minor_hash = 0;
-        frame = dx_probe(NULL, dir, &hinfo, frames, &err);
-        if (!frame)
-                return err;
+        frame = dx_probe(NULL, dir, &hinfo, frames);
+        if (IS_ERR(frame))
+                return PTR_ERR(frame);
 
         /* Add '.' and '..' from the htree header */
         if (!start_hash && !start_minor_hash) {
@@ -1227,8 +1202,7 @@ static struct buffer_head * ext4_find_entry (struct inode *dir,
                                    buffer */
         int num = 0;
         ext4_lblk_t  nblocks;
-        int i, err = 0;
-        int namelen;
+        int i, namelen;
 
         *res_dir = NULL;
         sb = dir->i_sb;
@@ -1258,17 +1232,13 @@ static struct buffer_head * ext4_find_entry (struct inode *dir,
                 goto restart;
         }
         if (is_dx(dir)) {
-                bh = ext4_dx_find_entry(dir, d_name, res_dir, &err);
+                bh = ext4_dx_find_entry(dir, d_name, res_dir);
                 /*
                  * On success, or if the error was file not found,
                  * return.  Otherwise, fall back to doing a search the
                  * old fashioned way.
                  */
-                if (err == -ENOENT)
-                        return NULL;
-                if (err && err != ERR_BAD_DX_DIR)
-                        return ERR_PTR(err);
-                if (bh)
+                if (!IS_ERR(bh) || PTR_ERR(bh) != ERR_BAD_DX_DIR)
                         return bh;
                 dxtrace(printk(KERN_DEBUG "ext4_find_entry: dx failed, "
                                "falling back\n"));
@@ -1298,10 +1268,10 @@ restart:
                                         break;
                                 }
                                 num++;
-                                bh = ext4_getblk(NULL, dir, b++, 0, &err);
-                                if (unlikely(err)) {
+                                bh = ext4_getblk(NULL, dir, b++, 0);
+                                if (unlikely(IS_ERR(bh))) {
                                         if (ra_max == 0)
-                                                return ERR_PTR(err);
+                                                return bh;
                                         break;
                                 }
                                 bh_use[ra_max] = bh;
@@ -1366,7 +1336,7 @@ cleanup_and_exit:
 }
 
 static struct buffer_head * ext4_dx_find_entry(struct inode *dir, const struct qstr *d_name,
-                       struct ext4_dir_entry_2 **res_dir, int *err)
+                       struct ext4_dir_entry_2 **res_dir)
 {
         struct super_block * sb = dir->i_sb;
         struct dx_hash_info     hinfo;
@@ -1375,25 +1345,23 @@ static struct buffer_head * ext4_dx_find_entry(struct inode *dir, const struct q
         ext4_lblk_t block;
         int retval;
 
-        if (!(frame = dx_probe(d_name, dir, &hinfo, frames, err)))
-                return NULL;
+        frame = dx_probe(d_name, dir, &hinfo, frames);
+        if (IS_ERR(frame))
+                return (struct buffer_head *) frame;
         do {
                 block = dx_get_block(frame->at);
                 bh = ext4_read_dirblock(dir, block, DIRENT);
-                if (IS_ERR(bh)) {
-                        *err = PTR_ERR(bh);
+                if (IS_ERR(bh))
                         goto errout;
-                }
+
                 retval = search_dirblock(bh, dir, d_name,
                                          block << EXT4_BLOCK_SIZE_BITS(sb),
                                          res_dir);
-                if (retval == 1) {      /* Success! */
-                        dx_release(frames);
-                        return bh;
-                }
+                if (retval == 1)
+                        goto success;
                 brelse(bh);
                 if (retval == -1) {
-                        *err = ERR_BAD_DX_DIR;
+                        bh = ERR_PTR(ERR_BAD_DX_DIR);
                         goto errout;
                 }
 
@@ -1402,18 +1370,19 @@ static struct buffer_head * ext4_dx_find_entry(struct inode *dir, const struct q
                                                frames, NULL);
                 if (retval < 0) {
                         ext4_warning(sb,
-                             "error reading index page in directory #%lu",
-                             dir->i_ino);
-                        *err = retval;
+                             "error %d reading index page in directory #%lu",
+                             retval, dir->i_ino);
+                        bh = ERR_PTR(retval);
                         goto errout;
                 }
         } while (retval == 1);
 
-        *err = -ENOENT;
+        bh = NULL;
 errout:
         dxtrace(printk(KERN_DEBUG "%s not found\n", d_name->name));
-        dx_release (frames);
-        return NULL;
+success:
+        dx_release(frames);
+        return bh;
 }
 
 static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
@@ -1441,7 +1410,7 @@ static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, unsi
                                          dentry);
                         return ERR_PTR(-EIO);
                 }
-                inode = ext4_iget(dir->i_sb, ino);
+                inode = ext4_iget_normal(dir->i_sb, ino);
                 if (inode == ERR_PTR(-ESTALE)) {
                         EXT4_ERROR_INODE(dir,
                                          "deleted inode referenced: %u",
@@ -1474,7 +1443,7 @@ struct dentry *ext4_get_parent(struct dentry *child)
                 return ERR_PTR(-EIO);
         }
 
-        return d_obtain_alias(ext4_iget(child->d_inode->i_sb, ino));
+        return d_obtain_alias(ext4_iget_normal(child->d_inode->i_sb, ino));
 }
 
 /*
@@ -1533,7 +1502,7 @@ static struct ext4_dir_entry_2* dx_pack_dirents(char *base, unsigned blocksize)
  */
 static struct ext4_dir_entry_2 *do_split(handle_t *handle, struct inode *dir,
                         struct buffer_head **bh,struct dx_frame *frame,
-                        struct dx_hash_info *hinfo, int *error)
+                        struct dx_hash_info *hinfo)
 {
         unsigned blocksize = dir->i_sb->s_blocksize;
         unsigned count, continued;
@@ -1548,16 +1517,14 @@ static struct ext4_dir_entry_2 *do_split(handle_t *handle, struct inode *dir,
         int     csum_size = 0;
         int     err = 0, i;
 
-        if (EXT4_HAS_RO_COMPAT_FEATURE(dir->i_sb,
-                                       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+        if (ext4_has_metadata_csum(dir->i_sb))
                 csum_size = sizeof(struct ext4_dir_entry_tail);
 
         bh2 = ext4_append(handle, dir, &newblock);
         if (IS_ERR(bh2)) {
                 brelse(*bh);
                 *bh = NULL;
-                *error = PTR_ERR(bh2);
-                return NULL;
+                return (struct ext4_dir_entry_2 *) bh2;
         }
 
         BUFFER_TRACE(*bh, "get_write_access");
@@ -1617,8 +1584,7 @@ static struct ext4_dir_entry_2 *do_split(handle_t *handle, struct inode *dir,
         dxtrace(dx_show_leaf (hinfo, (struct ext4_dir_entry_2 *) data2, blocksize, 1));
 
         /* Which block gets the new entry? */
-        if (hinfo->hash >= hash2)
-        {
+        if (hinfo->hash >= hash2) {
                 swap(*bh, bh2);
                 de = de2;
         }
@@ -1638,8 +1604,7 @@ journal_error:
         brelse(bh2);
         *bh = NULL;
         ext4_std_error(dir->i_sb, err);
-        *error = err;
-        return NULL;
+        return ERR_PTR(err);
 }
 
 int ext4_find_dest_de(struct inode *dir, struct inode *inode,
@@ -1718,8 +1683,7 @@ static int add_dirent_to_buf(handle_t *handle, struct dentry *dentry,
         int             csum_size = 0;
         int             err;
 
-        if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
-                                       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+        if (ext4_has_metadata_csum(inode->i_sb))
                 csum_size = sizeof(struct ext4_dir_entry_tail);
 
         if (!de) {
@@ -1786,8 +1750,7 @@ static int make_indexed_dir(handle_t *handle, struct dentry *dentry,
         struct fake_dirent *fde;
         int             csum_size = 0;
 
-        if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
-                                       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+        if (ext4_has_metadata_csum(inode->i_sb))
                 csum_size = sizeof(struct ext4_dir_entry_tail);
 
         blocksize =  dir->i_sb->s_blocksize;
@@ -1853,31 +1816,39 @@ static int make_indexed_dir(handle_t *handle, struct dentry *dentry,
                 hinfo.hash_version += EXT4_SB(dir->i_sb)->s_hash_unsigned;
         hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed;
         ext4fs_dirhash(name, namelen, &hinfo);
+        memset(frames, 0, sizeof(frames));
         frame = frames;
         frame->entries = entries;
         frame->at = entries;
         frame->bh = bh;
         bh = bh2;
 
-        ext4_handle_dirty_dx_node(handle, dir, frame->bh);
-        ext4_handle_dirty_dirent_node(handle, dir, bh);
+        retval = ext4_handle_dirty_dx_node(handle, dir, frame->bh);
+        if (retval)
+                goto out_frames;        
+        retval = ext4_handle_dirty_dirent_node(handle, dir, bh);
+        if (retval)
+                goto out_frames;        
 
-        de = do_split(handle,dir, &bh, frame, &hinfo, &retval);
-        if (!de) {
-                /*
-                 * Even if the block split failed, we have to properly write
-                 * out all the changes we did so far. Otherwise we can end up
-                 * with corrupted filesystem.
-                 */
-                ext4_mark_inode_dirty(handle, dir);
-                dx_release(frames);
-                return retval;
+        de = do_split(handle,dir, &bh, frame, &hinfo);
+        if (IS_ERR(de)) {
+                retval = PTR_ERR(de);
+                goto out_frames;
         }
         dx_release(frames);
 
         retval = add_dirent_to_buf(handle, dentry, inode, de, bh);
         brelse(bh);
         return retval;
+out_frames:
+        /*
+         * Even if the block split failed, we have to properly write
+         * out all the changes we did so far. Otherwise we can end up
+         * with corrupted filesystem.
+         */
+        ext4_mark_inode_dirty(handle, dir);
+        dx_release(frames);
+        return retval;
 }
 
 /*
@@ -1904,8 +1875,7 @@ static int ext4_add_entry(handle_t *handle, struct dentry *dentry,
         ext4_lblk_t block, blocks;
         int     csum_size = 0;
 
-        if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
-                                       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+        if (ext4_has_metadata_csum(inode->i_sb))
                 csum_size = sizeof(struct ext4_dir_entry_tail);
 
         sb = dir->i_sb;
@@ -1982,9 +1952,9 @@ static int ext4_dx_add_entry(handle_t *handle, struct dentry *dentry,
         struct ext4_dir_entry_2 *de;
         int err;
 
-        frame = dx_probe(&dentry->d_name, dir, &hinfo, frames, &err);
-        if (!frame)
-                return err;
+        frame = dx_probe(&dentry->d_name, dir, &hinfo, frames);
+        if (IS_ERR(frame))
+                return PTR_ERR(frame);
         entries = frame->entries;
         at = frame->at;
         bh = ext4_read_dirblock(dir, dx_get_block(frame->at), DIRENT);
@@ -2095,9 +2065,11 @@ static int ext4_dx_add_entry(handle_t *handle, struct dentry *dentry,
                         goto cleanup;
                 }
         }
-        de = do_split(handle, dir, &bh, frame, &hinfo, &err);
-        if (!de)
+        de = do_split(handle, dir, &bh, frame, &hinfo);
+        if (IS_ERR(de)) {
+                err = PTR_ERR(de);
                 goto cleanup;
+        }
         err = add_dirent_to_buf(handle, dentry, inode, de, bh);
         goto cleanup;
 
@@ -2167,8 +2139,7 @@ static int ext4_delete_entry(handle_t *handle,
                         return err;
         }
 
-        if (EXT4_HAS_RO_COMPAT_FEATURE(dir->i_sb,
-                                       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+        if (ext4_has_metadata_csum(dir->i_sb))
                 csum_size = sizeof(struct ext4_dir_entry_tail);
 
         BUFFER_TRACE(bh, "get_write_access");
@@ -2387,8 +2358,7 @@ static int ext4_init_new_dir(handle_t *handle, struct inode *dir,
         int csum_size = 0;
         int err;
 
-        if (EXT4_HAS_RO_COMPAT_FEATURE(dir->i_sb,
-                                       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+        if (ext4_has_metadata_csum(dir->i_sb))
                 csum_size = sizeof(struct ext4_dir_entry_tail);
 
         if (ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
@@ -2403,10 +2373,6 @@ static int ext4_init_new_dir(handle_t *handle, struct inode *dir,
         dir_block = ext4_append(handle, inode, &block);
         if (IS_ERR(dir_block))
                 return PTR_ERR(dir_block);
-        BUFFER_TRACE(dir_block, "get_write_access");
-        err = ext4_journal_get_write_access(handle, dir_block);
-        if (err)
-                goto out;
         de = (struct ext4_dir_entry_2 *)dir_block->b_data;
         ext4_init_dot_dotdot(inode, de, blocksize, csum_size, dir->i_ino, 0);
         set_nlink(inode, 2);
@@ -2573,7 +2539,7 @@ int ext4_orphan_add(handle_t *handle, struct inode *inode)
         int err = 0, rc;
         bool dirty = false;
 
-        if (!sbi->s_journal)
+        if (!sbi->s_journal || is_bad_inode(inode))
                 return 0;
 
         WARN_ON_ONCE(!(inode->i_state & (I_NEW | I_FREEING)) &&
@@ -3190,6 +3156,39 @@ static void ext4_update_dir_count(handle_t *handle, struct ext4_renament *ent)
         }
 }
 
+static struct inode *ext4_whiteout_for_rename(struct ext4_renament *ent,
+                                              int credits, handle_t **h)
+{
+        struct inode *wh;
+        handle_t *handle;
+        int retries = 0;
+
+        /*
+         * for inode block, sb block, group summaries,
+         * and inode bitmap
+         */
+        credits += (EXT4_MAXQUOTAS_TRANS_BLOCKS(ent->dir->i_sb) +
+                    EXT4_XATTR_TRANS_BLOCKS + 4);
+retry:
+        wh = ext4_new_inode_start_handle(ent->dir, S_IFCHR | WHITEOUT_MODE,
+                                         &ent->dentry->d_name, 0, NULL,
+                                         EXT4_HT_DIR, credits);
+
+        handle = ext4_journal_current_handle();
+        if (IS_ERR(wh)) {
+                if (handle)
+                        ext4_journal_stop(handle);
+                if (PTR_ERR(wh) == -ENOSPC &&
+                    ext4_should_retry_alloc(ent->dir->i_sb, &retries))
+                        goto retry;
+        } else {
+                *h = handle;
+                init_special_inode(wh, wh->i_mode, WHITEOUT_DEV);
+                wh->i_op = &ext4_special_inode_operations;
+        }
+        return wh;
+}
+
 /*
  * Anybody can rename anything with this: the permission checks are left to the
  * higher-level routines.
@@ -3199,7 +3198,8 @@ static void ext4_update_dir_count(handle_t *handle, struct ext4_renament *ent)
  * This comes from rename(const char *oldpath, const char *newpath)
  */
 static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
-                       struct inode *new_dir, struct dentry *new_dentry)
+                       struct inode *new_dir, struct dentry *new_dentry,
+                       unsigned int flags)
 {
         handle_t *handle = NULL;
         struct ext4_renament old = {
@@ -3214,6 +3214,9 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
         };
         int force_reread;
         int retval;
+        struct inode *whiteout = NULL;
+        int credits;
+        u8 old_file_type;
 
         dquot_initialize(old.dir);
         dquot_initialize(new.dir);
@@ -3252,11 +3255,17 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
         if (new.inode && !test_opt(new.dir->i_sb, NO_AUTO_DA_ALLOC))
                 ext4_alloc_da_blocks(old.inode);
 
-        handle = ext4_journal_start(old.dir, EXT4_HT_DIR,
-                (2 * EXT4_DATA_TRANS_BLOCKS(old.dir->i_sb) +
-                 EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2));
-        if (IS_ERR(handle))
-                return PTR_ERR(handle);
+        credits = (2 * EXT4_DATA_TRANS_BLOCKS(old.dir->i_sb) +
+                   EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2);
+        if (!(flags & RENAME_WHITEOUT)) {
+                handle = ext4_journal_start(old.dir, EXT4_HT_DIR, credits);
+                if (IS_ERR(handle))
+                        return PTR_ERR(handle);
+        } else {
+                whiteout = ext4_whiteout_for_rename(&old, credits, &handle);
+                if (IS_ERR(whiteout))
+                        return PTR_ERR(whiteout);
+        }
 
         if (IS_DIRSYNC(old.dir) || IS_DIRSYNC(new.dir))
                 ext4_handle_sync(handle);
@@ -3284,13 +3293,26 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
          */
         force_reread = (new.dir->i_ino == old.dir->i_ino &&
                         ext4_test_inode_flag(new.dir, EXT4_INODE_INLINE_DATA));
+
+        old_file_type = old.de->file_type;
+        if (whiteout) {
+                /*
+                 * Do this before adding a new entry, so the old entry is sure
+                 * to be still pointing to the valid old entry.
+                 */
+                retval = ext4_setent(handle, &old, whiteout->i_ino,
+                                     EXT4_FT_CHRDEV);
+                if (retval)
+                        goto end_rename;
+                ext4_mark_inode_dirty(handle, whiteout);
+        }
         if (!new.bh) {
                 retval = ext4_add_entry(handle, new.dentry, old.inode);
                 if (retval)
                         goto end_rename;
         } else {
                 retval = ext4_setent(handle, &new,
-                                     old.inode->i_ino, old.de->file_type);
+                                     old.inode->i_ino, old_file_type);
                 if (retval)
                         goto end_rename;
         }
@@ -3305,10 +3327,12 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
         old.inode->i_ctime = ext4_current_time(old.inode);
         ext4_mark_inode_dirty(handle, old.inode);
 
-        /*
-         * ok, that's it
-         */
-        ext4_rename_delete(handle, &old, force_reread);
+        if (!whiteout) {
+                /*
+                 * ok, that's it
+                 */
+                ext4_rename_delete(handle, &old, force_reread);
+        }
 
         if (new.inode) {
                 ext4_dec_count(handle, new.inode);
@@ -3344,6 +3368,12 @@ end_rename:
         brelse(old.dir_bh);
         brelse(old.bh);
         brelse(new.bh);
+        if (whiteout) {
+                if (retval)
+                        drop_nlink(whiteout);
+                unlock_new_inode(whiteout);
+                iput(whiteout);
+        }
         if (handle)
                 ext4_journal_stop(handle);
         return retval;
@@ -3476,18 +3506,15 @@ static int ext4_rename2(struct inode *old_dir, struct dentry *old_dentry,
                         struct inode *new_dir, struct dentry *new_dentry,
                         unsigned int flags)
 {
-        if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE))
+        if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
                 return -EINVAL;
 
         if (flags & RENAME_EXCHANGE) {
                 return ext4_cross_rename(old_dir, old_dentry,
                                          new_dir, new_dentry);
         }
-        /*
-         * Existence checking was done by the VFS, otherwise "RENAME_NOREPLACE"
-         * is equivalent to regular rename.
-         */
-        return ext4_rename(old_dir, old_dentry, new_dir, new_dentry);
+
+        return ext4_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
 }
 
 /*