diff options
| -rw-r--r-- | fs/ocfs2/xattr.c | 95 |
1 files changed, 60 insertions, 35 deletions
diff --git a/fs/ocfs2/xattr.c b/fs/ocfs2/xattr.c index 092a12318986..8f522f2f84a5 100644 --- a/fs/ocfs2/xattr.c +++ b/fs/ocfs2/xattr.c @@ -137,14 +137,14 @@ static int ocfs2_xattr_set_entry_index_block(struct inode *inode, static int ocfs2_delete_xattr_index_block(struct inode *inode, struct buffer_head *xb_bh); -static inline struct xattr_handler *ocfs2_xattr_handler(int name_index) +static inline const char *ocfs2_xattr_prefix(int name_index) { struct xattr_handler *handler = NULL; if (name_index > 0 && name_index < OCFS2_XATTR_MAX) handler = ocfs2_xattr_handler_map[name_index]; - return handler; + return handler ? handler->prefix : NULL; } static u32 ocfs2_xattr_name_hash(struct inode *inode, @@ -452,33 +452,56 @@ static int ocfs2_xattr_value_truncate(struct inode *inode, return ret; } +static int ocfs2_xattr_list_entry(char *buffer, size_t size, + size_t *result, const char *prefix, + const char *name, int name_len) +{ + char *p = buffer + *result; + int prefix_len = strlen(prefix); + int total_len = prefix_len + name_len + 1; + + *result += total_len; + + /* we are just looking for how big our buffer needs to be */ + if (!size) + return 0; + + if (*result > size) + return -ERANGE; + + memcpy(p, prefix, prefix_len); + memcpy(p + prefix_len, name, name_len); + p[prefix_len + name_len] = '\0'; + + return 0; +} + static int ocfs2_xattr_list_entries(struct inode *inode, struct ocfs2_xattr_header *header, char *buffer, size_t buffer_size) { - size_t rest = buffer_size; - int i; + size_t result = 0; + int i, type, ret; + const char *prefix, *name; for (i = 0 ; i < le16_to_cpu(header->xh_count); i++) { struct ocfs2_xattr_entry *entry = &header->xh_entries[i]; - struct xattr_handler *handler = - ocfs2_xattr_handler(ocfs2_xattr_get_type(entry)); - - if (handler) { - size_t size = handler->list(inode, buffer, rest, - ((char *)header + - le16_to_cpu(entry->xe_name_offset)), - entry->xe_name_len); - if (buffer) { - if (size > rest) - return -ERANGE; - buffer += size; - } - rest -= size; + type = ocfs2_xattr_get_type(entry); + prefix = ocfs2_xattr_prefix(type); + + if (prefix) { + name = (const char *)header + + le16_to_cpu(entry->xe_name_offset); + + ret = ocfs2_xattr_list_entry(buffer, buffer_size, + &result, prefix, name, + entry->xe_name_len); + if (ret) + return ret; } } - return buffer_size - rest; + return result; } static int ocfs2_xattr_ibody_list(struct inode *inode, @@ -2456,6 +2479,7 @@ out: struct ocfs2_xattr_tree_list { char *buffer; size_t buffer_size; + size_t result; }; static int ocfs2_xattr_bucket_get_name_value(struct inode *inode, @@ -2481,17 +2505,17 @@ static int ocfs2_list_xattr_bucket(struct inode *inode, struct ocfs2_xattr_bucket *bucket, void *para) { - int ret = 0; + int ret = 0, type; struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para; - size_t size; int i, block_off, new_offset; + const char *prefix, *name; for (i = 0 ; i < le16_to_cpu(bucket->xh->xh_count); i++) { struct ocfs2_xattr_entry *entry = &bucket->xh->xh_entries[i]; - struct xattr_handler *handler = - ocfs2_xattr_handler(ocfs2_xattr_get_type(entry)); + type = ocfs2_xattr_get_type(entry); + prefix = ocfs2_xattr_prefix(type); - if (handler) { + if (prefix) { ret = ocfs2_xattr_bucket_get_name_value(inode, bucket->xh, i, @@ -2499,16 +2523,16 @@ static int ocfs2_list_xattr_bucket(struct inode *inode, &new_offset); if (ret) break; - size = handler->list(inode, xl->buffer, xl->buffer_size, - bucket->bhs[block_off]->b_data + - new_offset, - entry->xe_name_len); - if (xl->buffer) { - if (size > xl->buffer_size) - return -ERANGE; - xl->buffer += size; - } - xl->buffer_size -= size; + + name = (const char *)bucket->bhs[block_off]->b_data + + new_offset; + ret = ocfs2_xattr_list_entry(xl->buffer, + xl->buffer_size, + &xl->result, + prefix, name, + entry->xe_name_len); + if (ret) + break; } } @@ -2527,6 +2551,7 @@ static int ocfs2_xattr_tree_list_index_block(struct inode *inode, struct ocfs2_xattr_tree_list xl = { .buffer = buffer, .buffer_size = buffer_size, + .result = 0, }; if (le16_to_cpu(el->l_next_free_rec) == 0) @@ -2554,7 +2579,7 @@ static int ocfs2_xattr_tree_list_index_block(struct inode *inode, name_hash = e_cpos - 1; } - ret = buffer_size - xl.buffer_size; + ret = xl.result; out: return ret; } |