diff options
Diffstat (limited to 'fs/xfs/libxfs/xfs_format.h')
| -rw-r--r-- | fs/xfs/libxfs/xfs_format.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h index 43de892d0305..3beaa819b790 100644 --- a/fs/xfs/libxfs/xfs_format.h +++ b/fs/xfs/libxfs/xfs_format.h @@ -935,6 +935,17 @@ enum xfs_dinode_fmt { #define XFS_MAX_EXTCNT_ATTR_FORK_SMALL ((xfs_extnum_t)((1ULL << 15) - 1)) /* + * When we upgrade an inode to the large extent counts, the maximum value by + * which the extent count can increase is bound by the change in size of the + * on-disk field. No upgrade operation should ever be adding more than a few + * tens of extents, so if we get a really large value it is a sign of a code bug + * or corruption. + */ +#define XFS_MAX_EXTCNT_UPGRADE_NR \ + min(XFS_MAX_EXTCNT_ATTR_FORK_LARGE - XFS_MAX_EXTCNT_ATTR_FORK_SMALL, \ + XFS_MAX_EXTCNT_DATA_FORK_LARGE - XFS_MAX_EXTCNT_DATA_FORK_SMALL) + +/* * Inode minimum and maximum sizes. */ #define XFS_DINODE_MIN_LOG 8 |