xfs: add sparse inode chunk alignment superblock field

Add sb_spino_align to the superblock to specify sparse inode chunk
alignment. This also currently represents the minimum allowable sparse
chunk allocation size.

Signed-off-by: Brian Foster <bfoster@redhat.com>

diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h
index 4daaa66..899d6b4 100644 (file)
--- a/fs/xfs/libxfs/xfs_format.h
+++ b/fs/xfs/libxfs/xfs_format.h
@@ -170,7 +170,7 @@ typedef struct xfs_sb {
        __uint32_t      sb_features_log_incompat;
 
        __uint32_t      sb_crc;         /* superblock crc */
-       __uint32_t      sb_pad;
+       xfs_extlen_t    sb_spino_align; /* sparse inode chunk alignment */
 
        xfs_ino_t       sb_pquotino;    /* project quota inode */
        xfs_lsn_t       sb_lsn;         /* last write sequence */
@@ -256,7 +256,7 @@ typedef struct xfs_dsb {
        __be32          sb_features_log_incompat;
 
        __le32          sb_crc;         /* superblock crc */
-       __be32          sb_pad;
+       __be32          sb_spino_align; /* sparse inode chunk alignment */
 
        __be64          sb_pquotino;    /* project quota inode */
        __be64          sb_lsn;         /* last write sequence */

diff --git a/fs/xfs/libxfs/xfs_sb.c b/fs/xfs/libxfs/xfs_sb.c
index dc4bfc5..32739a3 100644 (file)
--- a/fs/xfs/libxfs/xfs_sb.c
+++ b/fs/xfs/libxfs/xfs_sb.c
@@ -374,7 +374,7 @@ __xfs_sb_from_disk(
                                be32_to_cpu(from->sb_features_log_incompat);
        /* crc is only used on disk, not in memory; just init to 0 here. */
        to->sb_crc = 0;
-       to->sb_pad = 0;
+       to->sb_spino_align = be32_to_cpu(from->sb_spino_align);
        to->sb_pquotino = be64_to_cpu(from->sb_pquotino);
        to->sb_lsn = be64_to_cpu(from->sb_lsn);
        /* Convert on-disk flags to in-memory flags? */
@@ -516,7 +516,7 @@ xfs_sb_to_disk(
                                cpu_to_be32(from->sb_features_incompat);
                to->sb_features_log_incompat =
                                cpu_to_be32(from->sb_features_log_incompat);
-               to->sb_pad = 0;
+               to->sb_spino_align = cpu_to_be32(from->sb_spino_align);
                to->sb_lsn = cpu_to_be64(from->sb_lsn);
        }
 }