[XFS] Remove m_nreadaheads

m_nreadaheads in the mount struct is never used; remove it and the various
macros assigned to it. Also remove a couple other unused macros in the
same areas.

Removes one user of xfs_physmem.

SGI-PV: 968563
SGI-Modid: xfs-linux-melb:xfs-kern:29322a

Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Tim Shimmin <tes@sgi.com>

4 files changed, 0 insertions, 42 deletions

diff --git a/fs/xfs/linux-2.6/xfs_lrw.h b/fs/xfs/linux-2.6/xfs_lrw.h
index 7c60a1eed88b..1ad29bae5415 100644
--- a/fs/xfs/linux-2.6/xfs_lrw.h
+++ b/fs/xfs/linux-2.6/xfs_lrw.h
@@ -71,11 +71,6 @@ extern void xfs_inval_cached_trace(struct xfs_iocore *,
 #define xfs_inval_cached_trace(io, offset, len, first, last)
 #endif
 
-/*
- * Maximum count of bmaps used by read and write paths.
- */
-#define XFS_MAX_RW_NBMAPS       4
-
 extern int xfs_bmap(struct bhv_desc *, xfs_off_t, ssize_t, int,
                         struct xfs_iomap *, int *);
 extern int xfsbdstrat(struct xfs_mount *, struct xfs_buf *);
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index a66b39805176..4458e706b1c6 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -871,16 +871,6 @@ xfs_mountfs(
                 writeio_log = mp->m_writeio_log;
         }
 
-        /*
-         * Set the number of readahead buffers to use based on
-         * physical memory size.
-         */
-        if (xfs_physmem <= 4096)                /* <= 16MB */
-                mp->m_nreadaheads = XFS_RW_NREADAHEAD_16MB;
-        else if (xfs_physmem <= 8192)   /* <= 32MB */
-                mp->m_nreadaheads = XFS_RW_NREADAHEAD_32MB;
-        else
-                mp->m_nreadaheads = XFS_RW_NREADAHEAD_K32;
         if (sbp->sb_blocklog > readio_log) {
                 mp->m_readio_log = sbp->sb_blocklog;
         } else {
diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index 76ad74758696..1a5d1d360d80 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -362,7 +362,6 @@ typedef struct xfs_mount {
         __uint8_t               m_blkbb_log;    /* blocklog - BBSHIFT */
         __uint8_t               m_agno_log;     /* log #ag's */
         __uint8_t               m_agino_log;    /* #bits for agino in inum */
-        __uint8_t               m_nreadaheads;  /* #readahead buffers */
         __uint16_t              m_inode_cluster_size;/* min inode buf size */
         uint                    m_blockmask;    /* sb_blocksize-1 */
         uint                    m_blockwsize;   /* sb_blocksize in words */
diff --git a/fs/xfs/xfs_rw.h b/fs/xfs/xfs_rw.h
index fcf28dbded7c..943bddde83c6 100644
--- a/fs/xfs/xfs_rw.h
+++ b/fs/xfs/xfs_rw.h
@@ -23,32 +23,6 @@ struct xfs_inode;
 struct xfs_mount;
 
 /*
- * Maximum count of bmaps used by read and write paths.
- */
-#define XFS_MAX_RW_NBMAPS       4
-
-/*
- * Counts of readahead buffers to use based on physical memory size.
- * None of these should be more than XFS_MAX_RW_NBMAPS.
- */
-#define XFS_RW_NREADAHEAD_16MB  2
-#define XFS_RW_NREADAHEAD_32MB  3
-#define XFS_RW_NREADAHEAD_K32   4
-#define XFS_RW_NREADAHEAD_K64   4
-
-/*
- * Maximum size of a buffer that we\'ll map.  Making this
- * too big will degrade performance due to the number of
- * pages which need to be gathered.  Making it too small
- * will prevent us from doing large I/O\'s to hardware that
- * needs it.
- *
- * This is currently set to 512 KB.
- */
-#define XFS_MAX_BMAP_LEN_BB     1024
-#define XFS_MAX_BMAP_LEN_BYTES  524288
-
-/*
  * Convert the given file system block to a disk block.
  * We have to treat it differently based on whether the
  * file is a real time file or not, because the bmap code