xfs: remove m_attroffset

With the upcoming v3 inodes the default attroffset needs to be calculated
for each specific inode, so we can't cache it in the superblock anymore.

Also replace the assert for wrong inode sizes with a proper error check
also included in non-debug builds.  Note that the ENOSYS return for
that might seem odd, but that error is returned by xfs_mount_validate_sb
for all theoretically valid but not supported filesystem geometries.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>

diff --git a/fs/xfs/xfs_attr_leaf.c b/fs/xfs/xfs_attr_leaf.c
index aa001629b596f08fc5091e2c57f6a7d2982de124..afdc8911637d20c3f7f01ff4eb50ca832e27ab28 100644 (file)
--- a/fs/xfs/xfs_attr_leaf.c
+++ b/fs/xfs/xfs_attr_leaf.c
@@ -155,7 +155,8 @@ xfs_attr_shortform_bytesfit(xfs_inode_t *dp, int bytes)
                 * minimum offset only needs to be the space required for 
                 * the btree root.
                 */ 
-               if (!dp->i_d.di_forkoff && dp->i_df.if_bytes > mp->m_attroffset)
+               if (!dp->i_d.di_forkoff && dp->i_df.if_bytes >
+                   xfs_default_attroffset(dp))
                        dsize = XFS_BMDR_SPACE_CALC(MINDBTPTRS);
                break;
                

diff --git a/fs/xfs/xfs_bmap.c b/fs/xfs/xfs_bmap.c
index 47a87de35af5c2d59a7ab42949f45c8df4c89833..3a6ed426327ac15575fe0cf5e39b0a120dc3a373 100644 (file)
--- a/fs/xfs/xfs_bmap.c
+++ b/fs/xfs/xfs_bmap.c
@@ -3568,6 +3568,27 @@ xfs_bmap_extents_to_btree(
        return 0;
 }
 
+/*
+ * Calculate the default attribute fork offset for newly created inodes.
+ */
+uint
+xfs_default_attroffset(
+       struct xfs_inode        *ip)
+{
+       struct xfs_mount        *mp = ip->i_mount;
+       uint                    offset;
+
+       if (mp->m_sb.sb_inodesize == 256) {
+               offset = XFS_LITINO(mp) -
+                               XFS_BMDR_SPACE_CALC(MINABTPTRS);
+       } else {
+               offset = XFS_BMDR_SPACE_CALC(6 * MINABTPTRS);
+       }
+
+       ASSERT(offset < XFS_LITINO(mp));
+       return offset;
+}
+
 /*
  * Helper routine to reset inode di_forkoff field when switching
  * attribute fork from local to extent format - we reset it where
@@ -3580,15 +3601,18 @@ xfs_bmap_forkoff_reset(
        int             whichfork)
 {
        if (whichfork == XFS_ATTR_FORK &&
-           (ip->i_d.di_format != XFS_DINODE_FMT_DEV) &&
-           (ip->i_d.di_format != XFS_DINODE_FMT_UUID) &&
-           (ip->i_d.di_format != XFS_DINODE_FMT_BTREE) &&
-           ((mp->m_attroffset >> 3) > ip->i_d.di_forkoff)) {
-               ip->i_d.di_forkoff = mp->m_attroffset >> 3;
-               ip->i_df.if_ext_max = XFS_IFORK_DSIZE(ip) /
-                                       (uint)sizeof(xfs_bmbt_rec_t);
-               ip->i_afp->if_ext_max = XFS_IFORK_ASIZE(ip) /
-                                       (uint)sizeof(xfs_bmbt_rec_t);
+           ip->i_d.di_format != XFS_DINODE_FMT_DEV &&
+           ip->i_d.di_format != XFS_DINODE_FMT_UUID &&
+           ip->i_d.di_format != XFS_DINODE_FMT_BTREE) {
+               uint    dfl_forkoff = xfs_default_attroffset(ip) >> 3;
+
+               if (dfl_forkoff > ip->i_d.di_forkoff) {
+                       ip->i_d.di_forkoff = dfl_forkoff;
+                       ip->i_df.if_ext_max =
+                               XFS_IFORK_DSIZE(ip) / sizeof(xfs_bmbt_rec_t);
+                       ip->i_afp->if_ext_max =
+                               XFS_IFORK_ASIZE(ip) / sizeof(xfs_bmbt_rec_t);
+               }
        }
 }
 
@@ -4057,7 +4081,7 @@ xfs_bmap_add_attrfork(
        case XFS_DINODE_FMT_BTREE:
                ip->i_d.di_forkoff = xfs_attr_shortform_bytesfit(ip, size);
                if (!ip->i_d.di_forkoff)
-                       ip->i_d.di_forkoff = mp->m_attroffset >> 3;
+                       ip->i_d.di_forkoff = xfs_default_attroffset(ip) >> 3;
                else if (mp->m_flags & XFS_MOUNT_ATTR2)
                        version = 2;
                break;
@@ -4204,12 +4228,12 @@ xfs_bmap_compute_maxlevels(
         * (a signed 16-bit number, xfs_aextnum_t).
         *
         * Note that we can no longer assume that if we are in ATTR1 that
-        * the fork offset of all the inodes will be (m_attroffset >> 3)
-        * because we could have mounted with ATTR2 and then mounted back
-        * with ATTR1, keeping the di_forkoff's fixed but probably at
-        * various positions. Therefore, for both ATTR1 and ATTR2
-        * we have to assume the worst case scenario of a minimum size
-        * available.
+        * the fork offset of all the inodes will be
+        * (xfs_default_attroffset(ip) >> 3) because we could have mounted
+        * with ATTR2 and then mounted back with ATTR1, keeping the
+        * di_forkoff's fixed but probably at various positions. Therefore,
+        * for both ATTR1 and ATTR2 we have to assume the worst case scenario
+        * of a minimum size available.
         */
        if (whichfork == XFS_DATA_FORK) {
                maxleafents = MAXEXTNUM;

diff --git a/fs/xfs/xfs_bmap.h b/fs/xfs/xfs_bmap.h
index 589d3dabdd179d79fdabaeb0d1b531af29e73fc1..1b8ff9256bd0cba9515bc212c859a80c2335c157 100644 (file)
--- a/fs/xfs/xfs_bmap.h
+++ b/fs/xfs/xfs_bmap.h
@@ -338,6 +338,10 @@ xfs_check_nostate_extents(
        xfs_extnum_t            idx,
        xfs_extnum_t            num);
 
+uint
+xfs_default_attroffset(
+       struct xfs_inode        *ip);
+
 #ifdef __KERNEL__
 
 /*

diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index 1c372f998c15d1e4153c67c5a935a880d99529ab..92fedfcc879abee2944a02751f2ecba2ea11e461 100644 (file)
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -256,6 +256,22 @@ xfs_mount_validate_sb(
                return XFS_ERROR(ENOSYS);
        }
 
+       /*
+        * Currently only very few inode sizes are supported.
+        */
+       switch (sbp->sb_inodesize) {
+       case 256:
+       case 512:
+       case 1024:
+       case 2048:
+               break;
+       default:
+               xfs_fs_mount_cmn_err(flags,
+                       "inode size of %d bytes not supported",
+                       sbp->sb_inodesize);
+               return XFS_ERROR(ENOSYS);
+       }
+
        if (xfs_sb_validate_fsb_count(sbp, sbp->sb_dblocks) ||
            xfs_sb_validate_fsb_count(sbp, sbp->sb_rblocks)) {
                xfs_fs_mount_cmn_err(flags,
@@ -578,27 +594,6 @@ xfs_mount_common(xfs_mount_t *mp, xfs_sb_t *sbp)
        mp->m_blockwsize = sbp->sb_blocksize >> XFS_WORDLOG;
        mp->m_blockwmask = mp->m_blockwsize - 1;
 
-       /*
-        * Setup for attributes, in case they get created.
-        * This value is for inodes getting attributes for the first time,
-        * the per-inode value is for old attribute values.
-        */
-       ASSERT(sbp->sb_inodesize >= 256 && sbp->sb_inodesize <= 2048);
-       switch (sbp->sb_inodesize) {
-       case 256:
-               mp->m_attroffset = XFS_LITINO(mp) -
-                                  XFS_BMDR_SPACE_CALC(MINABTPTRS);
-               break;
-       case 512:
-       case 1024:
-       case 2048:
-               mp->m_attroffset = XFS_BMDR_SPACE_CALC(6 * MINABTPTRS);
-               break;
-       default:
-               ASSERT(0);
-       }
-       ASSERT(mp->m_attroffset < XFS_LITINO(mp));
-
        mp->m_alloc_mxr[0] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 1);
        mp->m_alloc_mxr[1] = xfs_allocbt_maxrecs(mp, sbp->sb_blocksize, 0);
        mp->m_alloc_mnr[0] = mp->m_alloc_mxr[0] / 2;

diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index 5dbc6f72d9886d34f33f17978a6674efc80d6572..7af44adffc8f308a4b51100a25bd1f0e7dfb1465 100644 (file)
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -276,7 +276,6 @@ typedef struct xfs_mount {
        int                     m_fixedfsid[2]; /* unchanged for life of FS */
        uint                    m_dmevmask;     /* DMI events for this FS */
        __uint64_t              m_flags;        /* global mount flags */
-       uint                    m_attroffset;   /* inode attribute offset */
        uint                    m_dir_node_ents; /* #entries in a dir danode */
        uint                    m_attr_node_ents; /* #entries in attr danode */
        int                     m_ialloc_inos;  /* inodes in inode allocation */