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[PATCH] Move attr log alloc size calculator to another function.

To: xfs@xxxxxxxxxxx
Subject: [PATCH] Move attr log alloc size calculator to another function.
From: Niv Sardi <xaiki@xxxxxxx>
Date: Thu, 10 Jul 2008 17:39:02 +1000
Cc: Niv Sardi <xaiki@xxxxxxx>
In-reply-to: <1215675545-2707-1-git-send-email-xaiki@xxxxxxx>
References: <1214196150-5427-1-git-send-email-xaiki@xxxxxxx> <1215675545-2707-1-git-send-email-xaiki@xxxxxxx>
Sender: xfs-bounce@xxxxxxxxxxx
We will need that to be able to calculate the size of log we need for
a specific attr (for Create+EA). The local flag is needed so that we
can fail if we run into ENOSPC when trying to alloc blocks.

Signed-off-by: Niv Sardi <xaiki@xxxxxxx>
---
 fs/xfs/xfs_attr.c |   80 +++++++++++++++++++++++++++++++---------------------
 fs/xfs/xfs_attr.h |    1 +
 2 files changed, 49 insertions(+), 32 deletions(-)

diff --git a/fs/xfs/xfs_attr.c b/fs/xfs/xfs_attr.c
index df151a8..4036bdc 100644
--- a/fs/xfs/xfs_attr.c
+++ b/fs/xfs/xfs_attr.c
@@ -196,6 +196,46 @@ xfs_attr_get(
        return(error);
 }
 
+/*
+ * Calculate how many blocks we need for the new attribute,
+ */
+int
+xfs_attr_calc_size(
+       struct xfs_inode        *ip,
+       int                     namelen,
+       int                     valuelen,
+       int                     *local)
+{
+       struct xfs_mount        *mp = ip->i_mount;
+       int                     size;
+       int                     nblks;
+
+       /*
+        * Determine space new attribute will use, and if it would be
+        * "local" or "remote" (note: local != inline).
+        */
+       size = xfs_attr_leaf_newentsize(namelen, valuelen,
+                                       mp->m_sb.sb_blocksize, local);
+
+       nblks = XFS_DAENTER_SPACE_RES(mp, XFS_ATTR_FORK);
+       if (*local) {
+               if (size > (mp->m_sb.sb_blocksize >> 1)) {
+                       /* Double split possible */
+                       nblks *= 2;
+               }
+       } else {
+               /*
+                * Out of line attribute, cannot double split, but
+                * make room for the attribute value itself.
+                */
+               uint    dblocks = XFS_B_TO_FSB(mp, valuelen);
+               nblks += dblocks;
+               nblks += XFS_NEXTENTADD_SPACE_RES(mp, dblocks, XFS_ATTR_FORK);
+       }
+
+       return nblks;
+}
+
 STATIC int
 xfs_attr_set_int(xfs_inode_t *dp, struct xfs_name *name,
                char *value, int valuelen, int flags)
@@ -204,10 +244,9 @@ xfs_attr_set_int(xfs_inode_t *dp, struct xfs_name *name,
        xfs_fsblock_t   firstblock;
        xfs_bmap_free_t flist;
        int             error, err2, committed;
-       int             local, size;
-       uint            nblks;
        xfs_mount_t     *mp = dp->i_mount;
        int             rsvd = (flags & ATTR_ROOT) != 0;
+       int             local;
 
        /*
         * Attach the dquots to the inode.
@@ -244,30 +283,8 @@ xfs_attr_set_int(xfs_inode_t *dp, struct xfs_name *name,
        args.addname = 1;
        args.oknoent = 1;
 
-       /*
-        * Determine space new attribute will use, and if it would be
-        * "local" or "remote" (note: local != inline).
-        */
-       size = xfs_attr_leaf_newentsize(name->len, valuelen,
-                                       mp->m_sb.sb_blocksize, &local);
-
-       nblks = XFS_DAENTER_SPACE_RES(mp, XFS_ATTR_FORK);
-       if (local) {
-               if (size > (mp->m_sb.sb_blocksize >> 1)) {
-                       /* Double split possible */
-                       nblks <<= 1;
-               }
-       } else {
-               uint    dblocks = XFS_B_TO_FSB(mp, valuelen);
-               /* Out of line attribute, cannot double split, but make
-                * room for the attribute value itself.
-                */
-               nblks += dblocks;
-               nblks += XFS_NEXTENTADD_SPACE_RES(mp, dblocks, XFS_ATTR_FORK);
-       }
-
        /* Size is now blocks for attribute data */
-       args.total = nblks;
+       args.total = xfs_attr_calc_size(dp, name->len, valuelen, &local);
 
        /*
         * Start our first transaction of the day.
@@ -289,18 +306,17 @@ xfs_attr_set_int(xfs_inode_t *dp, struct xfs_name *name,
        if (rsvd)
                args.trans->t_flags |= XFS_TRANS_RESERVE;
 
-       if ((error = xfs_trans_reserve(args.trans, (uint) nblks,
-                                     XFS_ATTRSET_LOG_RES(mp, nblks),
-                                     0, XFS_TRANS_PERM_LOG_RES,
-                                     XFS_ATTRSET_LOG_COUNT))) {
+       if ((error = xfs_trans_reserve(args.trans, args.total,
+                       XFS_ATTRSET_LOG_RES(mp, args.total), 0,
+                       XFS_TRANS_PERM_LOG_RES, XFS_ATTRSET_LOG_COUNT))) {
                xfs_trans_cancel(args.trans, 0);
                return(error);
        }
        xfs_ilock(dp, XFS_ILOCK_EXCL);
 
-       error = XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, args.trans, dp, nblks, 0,
-                        rsvd ? XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
-                               XFS_QMOPT_RES_REGBLKS);
+       error = XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, args.trans, dp, args.total, 0,
+                               rsvd ? XFS_QMOPT_RES_REGBLKS | 
XFS_QMOPT_FORCE_RES :
+                                      XFS_QMOPT_RES_REGBLKS);
        if (error) {
                xfs_iunlock(dp, XFS_ILOCK_EXCL);
                xfs_trans_cancel(args.trans, XFS_TRANS_RELEASE_LOG_RES);
diff --git a/fs/xfs/xfs_attr.h b/fs/xfs/xfs_attr.h
index 6cfc938..f99395c 100644
--- a/fs/xfs/xfs_attr.h
+++ b/fs/xfs/xfs_attr.h
@@ -158,6 +158,7 @@ struct xfs_da_args;
 /*
  * Overall external interface routines.
  */
+int xfs_attr_calc_size(struct xfs_inode *, int, int, int *);
 int xfs_attr_inactive(struct xfs_inode *dp);
 
 int xfs_attr_shortform_getvalue(struct xfs_da_args *);
-- 
1.5.6.2


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