diff options
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/ext4/xattr.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c index 22bfb6221a2d..174d4e4a295f 100644 --- a/fs/ext4/xattr.c +++ b/fs/ext4/xattr.c @@ -1459,6 +1459,12 @@ static int ext4_xattr_inode_lookup_create(handle_t *handle, struct inode *inode, return 0; } +/* + * Reserve min(block_size/8, 1024) bytes for xattr entries/names if ea_inode + * feature is enabled. + */ +#define EXT4_XATTR_BLOCK_RESERVE(inode) min(i_blocksize(inode)/8, 1024U) + static int ext4_xattr_set_entry(struct ext4_xattr_info *i, struct ext4_xattr_search *s, handle_t *handle, struct inode *inode) @@ -1518,6 +1524,20 @@ static int ext4_xattr_set_entry(struct ext4_xattr_info *i, ret = -ENOSPC; goto out; } + + /* + * If storing the value in an external inode is an option, + * reserve space for xattr entries/names in the external + * attribute block so that a long value does not occupy the + * whole space and prevent futher entries being added. + */ + if (ext4_has_feature_ea_inode(inode->i_sb) && new_size && + (s->end - s->base) == i_blocksize(inode) && + (min_offs + old_size - new_size) < + EXT4_XATTR_BLOCK_RESERVE(inode)) { + ret = -ENOSPC; + goto out; + } } /* |