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[PATCH V3] optimize XFS_IS_REALTIME_INODE w/o realtime config

To: David Chinner <dgc@xxxxxxx>
Subject: [PATCH V3] optimize XFS_IS_REALTIME_INODE w/o realtime config
From: Eric Sandeen <sandeen@xxxxxxxxxxx>
Date: Thu, 25 Oct 2007 19:57:30 -0500
Cc: xfs-oss <xfs@xxxxxxxxxxx>
In-reply-to: <46CF1B22.7090007@xxxxxxxxxxx>
References: <46C7627A.60503@xxxxxxxxxxx> <20070824140822.GP72985246@xxxxxxx> <46CF1B22.7090007@xxxxxxxxxxx>
Sender: xfs-bounce@xxxxxxxxxxx
User-agent: Thunderbird 2.0.0.6 (Macintosh/20070728)
Try again.. :)

-------------

Use XFS_IS_REALTIME_INODE in more places, and #define it to
0 if CONFIG_XFS_RT is off.  This should be safe because mount
checks in xfs_rtmount_init:

# define xfs_rtmount_init(m)    (((mp)->m_sb.sb_rblocks == 0)? 0 : (ENOSYS))

so if we get mounted w/o CONFIG_XFS_RT, no realtime inodes should
be encountered after that.

Defining XFS_IS_REALTIME_INODE to 0 saves a bit of stack space,
presumeably gcc can optimize around the various "if (0)" type
checks:

xfs_alloc_file_space    -8
xfs_bmap_adjacent       -16
xfs_bmapi               -8
xfs_bmap_rtalloc        -16
xfs_bunmapi             -28
xfs_free_file_space     -64
xfs_imap                +8  <-- ?  hmm.
xfs_iomap_write_direct  -12
xfs_qm_dqusage_adjust   -4
xfs_qm_vop_chown_reserve -4

Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxxx>

Index: linux-2.6-xfs/fs/xfs/xfs_rtalloc.h
===================================================================
--- linux-2.6-xfs.orig/fs/xfs/xfs_rtalloc.h
+++ linux-2.6-xfs/fs/xfs/xfs_rtalloc.h
@@ -21,8 +21,6 @@
 struct xfs_mount;
 struct xfs_trans;

-#define XFS_IS_REALTIME_INODE(ip) ((ip)->i_d.di_flags &
XFS_DIFLAG_REALTIME)
-
 /* Min and max rt extent sizes, specified in bytes */
 #define        XFS_MAX_RTEXTSIZE       (1024 * 1024 * 1024)    /* 1GB */
 #define        XFS_DFL_RTEXTSIZE       (64 * 1024)             /* 64KB */
Index: linux-2.6-xfs/fs/xfs/linux-2.6/xfs_ioctl.c
===================================================================
--- linux-2.6-xfs.orig/fs/xfs/linux-2.6/xfs_ioctl.c
+++ linux-2.6-xfs/fs/xfs/linux-2.6/xfs_ioctl.c
@@ -741,7 +741,7 @@ xfs_ioctl(
        case XFS_IOC_DIOINFO: {
                struct dioattr  da;
                xfs_buftarg_t   *target =
-                       (ip->i_d.di_flags & XFS_DIFLAG_REALTIME) ?
+                       XFS_IS_REALTIME_INODE(ip) ?
                        mp->m_rtdev_targp : mp->m_ddev_targp;

                da.d_mem = da.d_miniosz = 1 << target->bt_sshift;
Index: linux-2.6-xfs/fs/xfs/linux-2.6/xfs_lrw.c
===================================================================
--- linux-2.6-xfs.orig/fs/xfs/linux-2.6/xfs_lrw.c
+++ linux-2.6-xfs/fs/xfs/linux-2.6/xfs_lrw.c
@@ -213,7 +213,7 @@ xfs_read(

        if (unlikely(ioflags & IO_ISDIRECT)) {
                xfs_buftarg_t   *target =
-                       (ip->i_d.di_flags & XFS_DIFLAG_REALTIME) ?
+                       XFS_IS_REALTIME_INODE(ip) ?
                                mp->m_rtdev_targp : mp->m_ddev_targp;
                if ((*offset & target->bt_smask) ||
                    (size & target->bt_smask)) {
@@ -668,7 +668,7 @@ start:

        if (ioflags & IO_ISDIRECT) {
                xfs_buftarg_t   *target =
-                       (xip->i_d.di_flags & XFS_DIFLAG_REALTIME) ?
+                       XFS_IS_REALTIME_INODE(xip) ?
                                mp->m_rtdev_targp : mp->m_ddev_targp;

                if ((pos & target->bt_smask) || (count & target->bt_smask)) {
Index: linux-2.6-xfs/fs/xfs/xfs_dfrag.c
===================================================================
--- linux-2.6-xfs.orig/fs/xfs/xfs_dfrag.c
+++ linux-2.6-xfs/fs/xfs/xfs_dfrag.c
@@ -185,8 +185,7 @@ xfs_swap_extents(
        }

        /* Verify both files are either real-time or non-realtime */
-       if ((ip->i_d.di_flags & XFS_DIFLAG_REALTIME) !=
-           (tip->i_d.di_flags & XFS_DIFLAG_REALTIME)) {
+       if (XFS_IS_REALTIME_INODE(ip) != XFS_IS_REALTIME_INODE(tip)) {
                error = XFS_ERROR(EINVAL);
                goto error0;
        }
Index: linux-2.6-xfs/fs/xfs/xfs_rw.h
===================================================================
--- linux-2.6-xfs.orig/fs/xfs/xfs_rw.h
+++ linux-2.6-xfs/fs/xfs/xfs_rw.h
@@ -32,7 +32,7 @@ struct xfs_mount;
 static inline xfs_daddr_t
 xfs_fsb_to_db(struct xfs_inode *ip, xfs_fsblock_t fsb)
 {
-       return (((ip)->i_d.di_flags & XFS_DIFLAG_REALTIME) ? \
+       return (XFS_IS_REALTIME_INODE(ip) ? \
                 (xfs_daddr_t)XFS_FSB_TO_BB((ip)->i_mount, (fsb)) : \
                 XFS_FSB_TO_DADDR((ip)->i_mount, (fsb)));
 }
@@ -53,7 +53,7 @@ xfs_get_extsz_hint(
 {
        xfs_extlen_t    extsz;

-       if (unlikely(ip->i_d.di_flags & XFS_DIFLAG_REALTIME)) {
+       if (unlikely(XFS_IS_REALTIME_INODE(ip))) {
                extsz = (ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE)
                                ? ip->i_d.di_extsize
                                : ip->i_mount->m_sb.sb_rextsize;
Index: linux-2.6-xfs/fs/xfs/xfs_vnodeops.c
===================================================================
--- linux-2.6-xfs.orig/fs/xfs/xfs_vnodeops.c
+++ linux-2.6-xfs/fs/xfs/xfs_vnodeops.c
@@ -136,7 +136,7 @@ xfs_getattr(
        default:
                vap->va_rdev = 0;

-               if (!(ip->i_d.di_flags & XFS_DIFLAG_REALTIME)) {
+               if (!(XFS_IS_REALTIME_INODE(ip))) {
                        vap->va_blocksize = xfs_preferred_iosize(mp);
                } else {

@@ -508,7 +508,7 @@ xfs_setattr(
                 */
                if ((ip->i_d.di_nextents || ip->i_delayed_blks) &&
                    (mask & XFS_AT_XFLAGS) &&
-                   (ip->i_d.di_flags & XFS_DIFLAG_REALTIME) !=
+                   (XFS_IS_REALTIME_INODE(ip)) !=
                    (vap->va_xflags & XFS_XFLAG_REALTIME)) {
                        code = XFS_ERROR(EINVAL);       /* EFBIG? */
                        goto error_return;
@@ -520,7 +520,7 @@ xfs_setattr(
                if ((mask & XFS_AT_EXTSIZE) && vap->va_extsize != 0) {
                        xfs_extlen_t    size;

-                       if ((ip->i_d.di_flags & XFS_DIFLAG_REALTIME) ||
+                       if (XFS_IS_REALTIME_INODE(ip) ||
                            ((mask & XFS_AT_XFLAGS) &&
                            (vap->va_xflags & XFS_XFLAG_REALTIME))) {
                                size = mp->m_sb.sb_rextsize <<
@@ -1144,7 +1144,7 @@ xfs_fsync(
                 * If this inode is on the RT dev we need to flush that
                 * cache as well.
                 */
-               if (ip->i_d.di_flags & XFS_DIFLAG_REALTIME)
+               if (XFS_IS_REALTIME_INODE(ip))
                        xfs_blkdev_issue_flush(ip->i_mount->m_rtdev_targp);
        }

@@ -4044,7 +4044,7 @@ xfs_zero_remaining_bytes(
        int                     error = 0;

        bp = xfs_buf_get_noaddr(mp->m_sb.sb_blocksize,
-                               ip->i_d.di_flags & XFS_DIFLAG_REALTIME ?
+                               XFS_IS_REALTIME_INODE(ip) ?
                                mp->m_rtdev_targp : mp->m_ddev_targp);

        for (offset = startoff; offset <= endoff; offset = lastoffset + 1) {
@@ -4141,7 +4141,7 @@ xfs_free_file_space(
        error = 0;
        if (len <= 0)   /* if nothing being freed */
                return error;
-       rt = (ip->i_d.di_flags & XFS_DIFLAG_REALTIME);
+       rt = XFS_IS_REALTIME_INODE(ip);
        startoffset_fsb = XFS_B_TO_FSB(mp, offset);
        end_dmi_offset = offset + len;
        endoffset_fsb = XFS_B_TO_FSBT(mp, end_dmi_offset);
Index: linux-2.6-xfs/fs/xfs/xfs_dinode.h
===================================================================
--- linux-2.6-xfs.orig/fs/xfs/xfs_dinode.h
+++ linux-2.6-xfs/fs/xfs/xfs_dinode.h
@@ -273,6 +273,12 @@ typedef enum xfs_dinode_fmt
 #define XFS_DIFLAG_NODEFRAG      (1 << XFS_DIFLAG_NODEFRAG_BIT)
 #define XFS_DIFLAG_FILESTREAM    (1 << XFS_DIFLAG_FILESTREAM_BIT)

+#ifdef CONFIG_XFS_RT
+#define XFS_IS_REALTIME_INODE(ip) ((ip)->i_d.di_flags &
XFS_DIFLAG_REALTIME)
+#else
+#define XFS_IS_REALTIME_INODE(ip) (0)
+#endif
+
 #define XFS_DIFLAG_ANY \
        (XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \
         XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \
Index: linux-2.6-xfs/fs/xfs/dmapi/xfs_dm.c
===================================================================
--- linux-2.6-xfs.orig/fs/xfs/dmapi/xfs_dm.c
+++ linux-2.6-xfs/fs/xfs/dmapi/xfs_dm.c
@@ -1045,7 +1045,7 @@ xfs_dm_direct_ok(

        /* Realtime files can ONLY do direct I/O. */

-       if (ip->i_d.di_flags & XFS_DIFLAG_REALTIME)
+       if (XFS_IS_REALTIME_INODE(ip))
                return(1);

        /* If direct I/O is disabled, or if the request is too small, use
Index: linux-2.6-xfs/fs/xfs/xfs_bmap.c
===================================================================
--- linux-2.6-xfs.orig/fs/xfs/xfs_bmap.c
+++ linux-2.6-xfs/fs/xfs/xfs_bmap.c
@@ -2969,7 +2969,7 @@ STATIC int
 xfs_bmap_alloc(
        xfs_bmalloca_t  *ap)            /* bmap alloc argument struct */
 {
-       if ((ap->ip->i_d.di_flags & XFS_DIFLAG_REALTIME) && ap->userdata)
+       if (XFS_IS_REALTIME_INODE(ap->ip) && ap->userdata)
                return xfs_bmap_rtalloc(ap);
        return xfs_bmap_btalloc(ap);
 }
@@ -3096,8 +3096,7 @@ xfs_bmap_del_extent(
                /*
                 * Realtime allocation.  Free it and record di_nblocks update.
                 */
-               if (whichfork == XFS_DATA_FORK &&
-                   (ip->i_d.di_flags & XFS_DIFLAG_REALTIME)) {
+               if (whichfork == XFS_DATA_FORK && XFS_IS_REALTIME_INODE(ip)) {
                        xfs_fsblock_t   bno;
                        xfs_filblks_t   len;

Index: linux-2.6-xfs/fs/xfs/xfs_bmap_btree.c
===================================================================
--- linux-2.6-xfs.orig/fs/xfs/xfs_bmap_btree.c
+++ linux-2.6-xfs/fs/xfs/xfs_bmap_btree.c
@@ -2062,8 +2062,7 @@ xfs_bmbt_insert(
                                pcur->bc_private.b.allocated;
                        pcur->bc_private.b.allocated = 0;
                        ASSERT((cur->bc_private.b.firstblock != NULLFSBLOCK) ||
-                              (cur->bc_private.b.ip->i_d.di_flags &
-                               XFS_DIFLAG_REALTIME));
+                              XFS_IS_REALTIME_INODE(cur->bc_private.b.ip));
                        cur->bc_private.b.firstblock =
                                pcur->bc_private.b.firstblock;
                        ASSERT(cur->bc_private.b.flist ==
Index: linux-2.6-xfs/fs/xfs/xfs_inode.c
===================================================================
--- linux-2.6-xfs.orig/fs/xfs/xfs_inode.c
+++ linux-2.6-xfs/fs/xfs/xfs_inode.c
@@ -1296,7 +1296,7 @@ xfs_isize_check(
        if ((ip->i_d.di_mode & S_IFMT) != S_IFREG)
                return;

-       if (ip->i_d.di_flags & (XFS_DIFLAG_REALTIME | XFS_DIFLAG_EXTSIZE))
+       if (XFS_IS_REALTIME_INODE(ip) || (ip->i_d.di_flags & 
XFS_DIFLAG_EXTSIZE))
                return;

        nimaps = 2;
Index: linux-2.6-xfs/fs/xfs/linux-2.6/xfs_aops.c
===================================================================
--- linux-2.6-xfs.orig/fs/xfs/linux-2.6/xfs_aops.c
+++ linux-2.6-xfs/fs/xfs/linux-2.6/xfs_aops.c
@@ -113,7 +113,7 @@ xfs_find_bdev_for_inode(
 {
        struct xfs_mount        *mp = ip->i_mount;

-       if (ip->i_d.di_flags & XFS_DIFLAG_REALTIME)
+       if (XFS_IS_REALTIME_INODE(ip))
                return mp->m_rtdev_targp->bt_bdev;
        else
                return mp->m_ddev_targp->bt_bdev;
Index: linux-2.6-xfs/fs/xfs/linux-2.6/xfs_iops.c
===================================================================
--- linux-2.6-xfs.orig/fs/xfs/linux-2.6/xfs_iops.c
+++ linux-2.6-xfs/fs/xfs/linux-2.6/xfs_iops.c
@@ -597,7 +597,7 @@ xfs_vn_getattr(
                                   sysv_minor(ip->i_df.if_u2.if_rdev));
                break;
        default:
-               if (ip->i_d.di_flags & XFS_DIFLAG_REALTIME) {
+               if (XFS_IS_REALTIME_INODE(ip)) {
                        /*
                         * If the file blocks are being allocated from a
                         * realtime volume, then return the inode's realtime
Index: linux-2.6-xfs/fs/xfs/xfs_iomap.c
===================================================================
--- linux-2.6-xfs.orig/fs/xfs/xfs_iomap.c
+++ linux-2.6-xfs/fs/xfs/xfs_iomap.c
@@ -141,7 +141,7 @@ xfs_imap_to_bmap(
                iomapp->iomap_bsize = XFS_FSB_TO_B(mp, imap->br_blockcount);
                iomapp->iomap_flags = flags;

-               if (ip->i_d.di_flags & XFS_DIFLAG_REALTIME) {
+               if (XFS_IS_REALTIME_INODE(ip)) {
                        iomapp->iomap_flags |= IOMAP_REALTIME;
                        iomapp->iomap_target = mp->m_rtdev_targp;
                } else {
@@ -298,7 +298,7 @@ xfs_iomap_eof_align_last_fsb(
        xfs_extlen_t    align;
        int             eof, error;

-       if (ip->i_d.di_flags & XFS_DIFLAG_REALTIME)
+       if (XFS_IS_REALTIME_INODE(ip))
                ;
        /*
         * If mounted with the "-o swalloc" option, roundup the allocation
@@ -524,7 +524,7 @@ xfs_iomap_write_direct(
        }

        if (unlikely(!imap.br_startblock &&
-                    !(ip->i_d.di_flags & XFS_DIFLAG_REALTIME))) {
+                    !(XFS_IS_REALTIME_INODE(ip)))) {
                error = xfs_cmn_err_fsblock_zero(ip, &imap);
                goto error_out;
        }
@@ -687,7 +687,7 @@ retry:
        }

        if (unlikely(!imap[0].br_startblock &&
-                    !(ip->i_d.di_flags & XFS_DIFLAG_REALTIME)))
+                    !(XFS_IS_REALTIME_INODE(ip))))
                return xfs_cmn_err_fsblock_zero(ip, &imap[0]);

        *ret_imap = imap[0];
@@ -809,7 +809,7 @@ xfs_iomap_write_allocate(
                 */
                for (i = 0; i < nimaps; i++) {
                        if (unlikely(!imap[i].br_startblock &&
-                                    !(ip->i_d.di_flags & XFS_DIFLAG_REALTIME)))
+                                    !(XFS_IS_REALTIME_INODE(ip))))
                                return xfs_cmn_err_fsblock_zero(ip, &imap[i]);
                        if ((offset_fsb >= imap[i].br_startoff) &&
                            (offset_fsb < (imap[i].br_startoff +
@@ -907,7 +907,7 @@ xfs_iomap_write_unwritten(
                        return XFS_ERROR(error);

                if (unlikely(!imap.br_startblock &&
-                            !(ip->i_d.di_flags & XFS_DIFLAG_REALTIME)))
+                            !(XFS_IS_REALTIME_INODE(ip))))
                        return xfs_cmn_err_fsblock_zero(ip, &imap);

                if ((numblks_fsb = imap.br_blockcount) == 0) {



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