btrfs: Cleanup existing name_len checks

Since tree-checker has verified leaf when reading from disk, we don't
need the existing verify_dir_item() or btrfs_is_name_len_valid() checks.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

9 files changed, 9 insertions, 186 deletions

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index a56d00311578..09b72b6996ce 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -3060,15 +3060,10 @@ struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
                                           struct btrfs_path *path, u64 dir,
                                           const char *name, u16 name_len,
                                           int mod);
-int verify_dir_item(struct btrfs_fs_info *fs_info,
-                    struct extent_buffer *leaf, int slot,
-                    struct btrfs_dir_item *dir_item);
 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info,
                                                  struct btrfs_path *path,
                                                  const char *name,
                                                  int name_len);
-bool btrfs_is_name_len_valid(struct extent_buffer *leaf, int slot,
-                             unsigned long start, u16 name_len);
 
 /* orphan.c */
 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c
index 41cb9196eaa8..cbe421605cd5 100644
--- a/fs/btrfs/dir-item.c
+++ b/fs/btrfs/dir-item.c
@@ -403,8 +403,6 @@ struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info,
                         btrfs_dir_data_len(leaf, dir_item);
                 name_ptr = (unsigned long)(dir_item + 1);
 
-                if (verify_dir_item(fs_info, leaf, path->slots[0], dir_item))
-                        return NULL;
                 if (btrfs_dir_name_len(leaf, dir_item) == name_len &&
                     memcmp_extent_buffer(leaf, name, name_ptr, name_len) == 0)
                         return dir_item;
@@ -450,109 +448,3 @@ int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
         }
         return ret;
 }
-
-int verify_dir_item(struct btrfs_fs_info *fs_info,
-                    struct extent_buffer *leaf,
-                    int slot,
-                    struct btrfs_dir_item *dir_item)
-{
-        u16 namelen = BTRFS_NAME_LEN;
-        int ret;
-        u8 type = btrfs_dir_type(leaf, dir_item);
-
-        if (type >= BTRFS_FT_MAX) {
-                btrfs_crit(fs_info, "invalid dir item type: %d", (int)type);
-                return 1;
-        }
-
-        if (type == BTRFS_FT_XATTR)
-                namelen = XATTR_NAME_MAX;
-
-        if (btrfs_dir_name_len(leaf, dir_item) > namelen) {
-                btrfs_crit(fs_info, "invalid dir item name len: %u",
-                       (unsigned)btrfs_dir_name_len(leaf, dir_item));
-                return 1;
-        }
-
-        namelen = btrfs_dir_name_len(leaf, dir_item);
-        ret = btrfs_is_name_len_valid(leaf, slot,
-                                      (unsigned long)(dir_item + 1), namelen);
-        if (!ret)
-                return 1;
-
-        /* BTRFS_MAX_XATTR_SIZE is the same for all dir items */
-        if ((btrfs_dir_data_len(leaf, dir_item) +
-             btrfs_dir_name_len(leaf, dir_item)) >
-                                        BTRFS_MAX_XATTR_SIZE(fs_info)) {
-                btrfs_crit(fs_info, "invalid dir item name + data len: %u + %u",
-                           (unsigned)btrfs_dir_name_len(leaf, dir_item),
-                           (unsigned)btrfs_dir_data_len(leaf, dir_item));
-                return 1;
-        }
-
-        return 0;
-}
-
-bool btrfs_is_name_len_valid(struct extent_buffer *leaf, int slot,
-                             unsigned long start, u16 name_len)
-{
-        struct btrfs_fs_info *fs_info = leaf->fs_info;
-        struct btrfs_key key;
-        u32 read_start;
-        u32 read_end;
-        u32 item_start;
-        u32 item_end;
-        u32 size;
-        bool ret = true;
-
-        ASSERT(start > BTRFS_LEAF_DATA_OFFSET);
-
-        read_start = start - BTRFS_LEAF_DATA_OFFSET;
-        read_end = read_start + name_len;
-        item_start = btrfs_item_offset_nr(leaf, slot);
-        item_end = btrfs_item_end_nr(leaf, slot);
-
-        btrfs_item_key_to_cpu(leaf, &key, slot);
-
-        switch (key.type) {
-        case BTRFS_DIR_ITEM_KEY:
-        case BTRFS_XATTR_ITEM_KEY:
-        case BTRFS_DIR_INDEX_KEY:
-                size = sizeof(struct btrfs_dir_item);
-                break;
-        case BTRFS_INODE_REF_KEY:
-                size = sizeof(struct btrfs_inode_ref);
-                break;
-        case BTRFS_INODE_EXTREF_KEY:
-                size = sizeof(struct btrfs_inode_extref);
-                break;
-        case BTRFS_ROOT_REF_KEY:
-        case BTRFS_ROOT_BACKREF_KEY:
-                size = sizeof(struct btrfs_root_ref);
-                break;
-        default:
-                ret = false;
-                goto out;
-        }
-
-        if (read_start < item_start) {
-                ret = false;
-                goto out;
-        }
-        if (read_end > item_end) {
-                ret = false;
-                goto out;
-        }
-
-        /* there shall be item(s) before name */
-        if (read_start - item_start < size) {
-                ret = false;
-                goto out;
-        }
-
-out:
-        if (!ret)
-                btrfs_crit(fs_info, "invalid dir item name len: %u",
-                           (unsigned int)name_len);
-        return ret;
-}
diff --git a/fs/btrfs/export.c b/fs/btrfs/export.c
index 3aeb5770f896..ddaccad469f8 100644
--- a/fs/btrfs/export.c
+++ b/fs/btrfs/export.c
@@ -283,11 +283,6 @@ static int btrfs_get_name(struct dentry *parent, char *name,
                 name_len = btrfs_inode_ref_name_len(leaf, iref);
         }
 
-        ret = btrfs_is_name_len_valid(leaf, path->slots[0], name_ptr, name_len);
-        if (!ret) {
-                btrfs_free_path(path);
-                return -EIO;
-        }
         read_extent_buffer(leaf, name, name_ptr, name_len);
         btrfs_free_path(path);
 
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 2e92c582cda0..ff91b2e3979a 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -5907,7 +5907,6 @@ static int btrfs_filldir(void *addr, int entries, struct dir_context *ctx)
 static int btrfs_real_readdir(struct file *file, struct dir_context *ctx)
 {
         struct inode *inode = file_inode(file);
-        struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
         struct btrfs_root *root = BTRFS_I(inode)->root;
         struct btrfs_file_private *private = file->private_data;
         struct btrfs_dir_item *di;
@@ -5975,9 +5974,6 @@ again:
                 if (btrfs_should_delete_dir_index(&del_list, found_key.offset))
                         goto next;
                 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
-                if (verify_dir_item(fs_info, leaf, slot, di))
-                        goto next;
-
                 name_len = btrfs_dir_name_len(leaf, di);
                 if ((total_len + sizeof(struct dir_entry) + name_len) >=
                     PAGE_SIZE) {
diff --git a/fs/btrfs/props.c b/fs/btrfs/props.c
index f6a05f836629..c39a940d0c75 100644
--- a/fs/btrfs/props.c
+++ b/fs/btrfs/props.c
@@ -164,7 +164,6 @@ static int iterate_object_props(struct btrfs_root *root,
                                                  size_t),
                                 void *ctx)
 {
-        struct btrfs_fs_info *fs_info = root->fs_info;
         int ret;
         char *name_buf = NULL;
         char *value_buf = NULL;
@@ -215,12 +214,6 @@ static int iterate_object_props(struct btrfs_root *root,
                         name_ptr = (unsigned long)(di + 1);
                         data_ptr = name_ptr + name_len;
 
-                        if (verify_dir_item(fs_info, leaf,
-                                            path->slots[0], di)) {
-                                ret = -EIO;
-                                goto out;
-                        }
-
                         if (name_len <= XATTR_BTRFS_PREFIX_LEN ||
                             memcmp_extent_buffer(leaf, XATTR_BTRFS_PREFIX,
                                                  name_ptr,
diff --git a/fs/btrfs/root-tree.c b/fs/btrfs/root-tree.c
index 3338407ef0f0..aab0194efe46 100644
--- a/fs/btrfs/root-tree.c
+++ b/fs/btrfs/root-tree.c
@@ -387,13 +387,6 @@ again:
                 WARN_ON(btrfs_root_ref_dirid(leaf, ref) != dirid);
                 WARN_ON(btrfs_root_ref_name_len(leaf, ref) != name_len);
                 ptr = (unsigned long)(ref + 1);
-                ret = btrfs_is_name_len_valid(leaf, path->slots[0], ptr,
-                                              name_len);
-                if (!ret) {
-                        err = -EIO;
-                        goto out;
-                }
-
                 WARN_ON(memcmp_extent_buffer(leaf, name, ptr, name_len));
                 *sequence = btrfs_root_ref_sequence(leaf, ref);
 
diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index 20d3300bd268..f306c608dc28 100644
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -1059,12 +1059,6 @@ static int iterate_dir_item(struct btrfs_root *root, struct btrfs_path *path,
                         }
                 }
 
-                ret = btrfs_is_name_len_valid(eb, path->slots[0],
-                          (unsigned long)(di + 1), name_len + data_len);
-                if (!ret) {
-                        ret = -EIO;
-                        goto out;
-                }
                 if (name_len + data_len > buf_len) {
                         buf_len = name_len + data_len;
                         if (is_vmalloc_addr(buf)) {
diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index 7bf9b31561db..a806182dfea6 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -1173,19 +1173,15 @@ next:
         return 0;
 }
 
-static int extref_get_fields(struct extent_buffer *eb, int slot,
-                             unsigned long ref_ptr, u32 *namelen, char **name,
-                             u64 *index, u64 *parent_objectid)
+static int extref_get_fields(struct extent_buffer *eb, unsigned long ref_ptr,
+                             u32 *namelen, char **name, u64 *index,
+                             u64 *parent_objectid)
 {
         struct btrfs_inode_extref *extref;
 
         extref = (struct btrfs_inode_extref *)ref_ptr;
 
         *namelen = btrfs_inode_extref_name_len(eb, extref);
-        if (!btrfs_is_name_len_valid(eb, slot, (unsigned long)&extref->name,
-                                     *namelen))
-                return -EIO;
-
         *name = kmalloc(*namelen, GFP_NOFS);
         if (*name == NULL)
                 return -ENOMEM;
@@ -1200,19 +1196,14 @@ static int extref_get_fields(struct extent_buffer *eb, int slot,
         return 0;
 }
 
-static int ref_get_fields(struct extent_buffer *eb, int slot,
-                          unsigned long ref_ptr, u32 *namelen, char **name,
-                          u64 *index)
+static int ref_get_fields(struct extent_buffer *eb, unsigned long ref_ptr,
+                          u32 *namelen, char **name, u64 *index)
 {
         struct btrfs_inode_ref *ref;
 
         ref = (struct btrfs_inode_ref *)ref_ptr;
 
         *namelen = btrfs_inode_ref_name_len(eb, ref);
-        if (!btrfs_is_name_len_valid(eb, slot, (unsigned long)(ref + 1),
-                                     *namelen))
-                return -EIO;
-
         *name = kmalloc(*namelen, GFP_NOFS);
         if (*name == NULL)
                 return -ENOMEM;
@@ -1287,8 +1278,8 @@ static noinline int add_inode_ref(struct btrfs_trans_handle *trans,
 
         while (ref_ptr < ref_end) {
                 if (log_ref_ver) {
-                        ret = extref_get_fields(eb, slot, ref_ptr, &namelen,
-                                          &name, &ref_index, &parent_objectid);
+                        ret = extref_get_fields(eb, ref_ptr, &namelen, &name,
+                                                &ref_index, &parent_objectid);
                         /*
                          * parent object can change from one array
                          * item to another.
@@ -1300,8 +1291,8 @@ static noinline int add_inode_ref(struct btrfs_trans_handle *trans,
                                 goto out;
                         }
                 } else {
-                        ret = ref_get_fields(eb, slot, ref_ptr, &namelen,
-                                             &name, &ref_index);
+                        ret = ref_get_fields(eb, ref_ptr, &namelen, &name,
+                                             &ref_index);
                 }
                 if (ret)
                         goto out;
@@ -1835,7 +1826,6 @@ static noinline int replay_one_dir_item(struct btrfs_trans_handle *trans,
                                         struct extent_buffer *eb, int slot,
                                         struct btrfs_key *key)
 {
-        struct btrfs_fs_info *fs_info = root->fs_info;
         int ret = 0;
         u32 item_size = btrfs_item_size_nr(eb, slot);
         struct btrfs_dir_item *di;
@@ -1848,8 +1838,6 @@ static noinline int replay_one_dir_item(struct btrfs_trans_handle *trans,
         ptr_end = ptr + item_size;
         while (ptr < ptr_end) {
                 di = (struct btrfs_dir_item *)ptr;
-                if (verify_dir_item(fs_info, eb, slot, di))
-                        return -EIO;
                 name_len = btrfs_dir_name_len(eb, di);
                 ret = replay_one_name(trans, root, path, eb, di, key);
                 if (ret < 0)
@@ -2024,11 +2012,6 @@ again:
         ptr_end = ptr + item_size;
         while (ptr < ptr_end) {
                 di = (struct btrfs_dir_item *)ptr;
-                if (verify_dir_item(fs_info, eb, slot, di)) {
-                        ret = -EIO;
-                        goto out;
-                }
-
                 name_len = btrfs_dir_name_len(eb, di);
                 name = kmalloc(name_len, GFP_NOFS);
                 if (!name) {
@@ -2109,7 +2092,6 @@ static int replay_xattr_deletes(struct btrfs_trans_handle *trans,
                               struct btrfs_path *path,
                               const u64 ino)
 {
-        struct btrfs_fs_info *fs_info = root->fs_info;
         struct btrfs_key search_key;
         struct btrfs_path *log_path;
         int i;
@@ -2151,11 +2133,6 @@ process_leaf:
                         u32 this_len = sizeof(*di) + name_len + data_len;
                         char *name;
 
-                        ret = verify_dir_item(fs_info, path->nodes[0], i, di);
-                        if (ret) {
-                                ret = -EIO;
-                                goto out;
-                        }
                         name = kmalloc(name_len, GFP_NOFS);
                         if (!name) {
                                 ret = -ENOMEM;
@@ -4572,12 +4549,6 @@ static int btrfs_check_ref_name_override(struct extent_buffer *eb,
                         this_len = sizeof(*extref) + this_name_len;
                 }
 
-                ret = btrfs_is_name_len_valid(eb, slot, name_ptr,
-                                              this_name_len);
-                if (!ret) {
-                        ret = -EIO;
-                        goto out;
-                }
                 if (this_name_len > name_len) {
                         char *new_name;
 
diff --git a/fs/btrfs/xattr.c b/fs/btrfs/xattr.c
index 2c7e53f9ff1b..ad298c248da4 100644
--- a/fs/btrfs/xattr.c
+++ b/fs/btrfs/xattr.c
@@ -267,7 +267,6 @@ ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size)
 {
         struct btrfs_key key;
         struct inode *inode = d_inode(dentry);
-        struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
         struct btrfs_root *root = BTRFS_I(inode)->root;
         struct btrfs_path *path;
         int ret = 0;
@@ -336,11 +335,6 @@ ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size)
                         u32 this_len = sizeof(*di) + name_len + data_len;
                         unsigned long name_ptr = (unsigned long)(di + 1);
 
-                        if (verify_dir_item(fs_info, leaf, slot, di)) {
-                                ret = -EIO;
-                                goto err;
-                        }
-
                         total_size += name_len + 1;
                         /*
                          * We are just looking for how big our buffer needs to