On Thu, Jul 24, 2014 at 10:22:55AM -0400, Brian Foster wrote: > Sparse inode chunks allow the traditional inode btree record format to > describe an inode chunk that is not fully allocated and/or contiguous. > Define a couple constants that set requirements for allocation and > management of such chunks. Also define a helper to easily detect sparse > inode chunks. > > The granularity of a sparse chunk is defined by the the 16-bit holemask > field in the inode record. Assuming 64 inodes per full chunk, a single > holemask bit accounts for 4 inodes. The minimum allocation requirement > for a sparse inode chunk is defined as the minimum number of blocks > required to meet the 4 inode granularity. > > Signed-off-by: Brian Foster <bfoster@xxxxxxxxxx> > --- > fs/xfs/libxfs/xfs_format.h | 9 +++++++++ > 1 file changed, 9 insertions(+) > > diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h > index 39022d9..0baad50 100644 > --- a/fs/xfs/libxfs/xfs_format.h > +++ b/fs/xfs/libxfs/xfs_format.h > @@ -211,6 +211,11 @@ typedef __uint64_t xfs_inofree_t; > #define XFS_INOBT_ALL_FREE ((xfs_inofree_t)-1) > #define XFS_INOBT_MASK(i) ((xfs_inofree_t)1 << (i)) > > +#define XFS_INODES_PER_SPCHUNK \ > + (XFS_INODES_PER_CHUNK / (NBBY * sizeof(__uint16_t))) > +#define XFS_INOBT_MIN_SPCHUNKLEN(sb) \ > + (roundup(XFS_INODES_PER_SPCHUNK, sb.sb_inopblock) / sb.sb_inopblock) static inline. -Dave. -- Dave Chinner david@xxxxxxxxxxxxx _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
