[PATCH 10/10] remove leftovers of shared read-only support

[Christoph Hellwig <hch@xxxxxxxxxxxxx>]

We never supported shared read-only filesystems, so remove the dead
code left over from IRIX for it.


Signed-off-by: Christoph Hellwig <hch@xxxxxx>

Index: linux-2.6-xfs/fs/xfs/xfs_mount.c
===================================================================
--- linux-2.6-xfs.orig/fs/xfs/xfs_mount.c       2008-10-25 13:00:27.000000000 
+0200
+++ linux-2.6-xfs/fs/xfs/xfs_mount.c    2008-10-25 13:18:54.000000000 +0200
@@ -1353,24 +1353,6 @@ xfs_log_sbcount(
        return error;
 }
 
-STATIC void
-xfs_mark_shared_ro(
-       xfs_mount_t     *mp,
-       xfs_buf_t       *bp)
-{
-       xfs_dsb_t       *sb = XFS_BUF_TO_SBP(bp);
-       __uint16_t      version;
-
-       if (!(sb->sb_flags & XFS_SBF_READONLY))
-               sb->sb_flags |= XFS_SBF_READONLY;
-
-       version = be16_to_cpu(sb->sb_versionnum);
-       if ((version & XFS_SB_VERSION_NUMBITS) != XFS_SB_VERSION_4 ||
-           !(version & XFS_SB_VERSION_SHAREDBIT))
-               version |= XFS_SB_VERSION_SHAREDBIT;
-       sb->sb_versionnum = cpu_to_be16(version);
-}
-
 int
 xfs_unmountfs_writesb(xfs_mount_t *mp)
 {
@@ -1386,12 +1368,6 @@ xfs_unmountfs_writesb(xfs_mount_t *mp)
 
                sbp = xfs_getsb(mp, 0);
 
-               /*
-                * mark shared-readonly if desired
-                */
-               if (mp->m_mk_sharedro)
-                       xfs_mark_shared_ro(mp, sbp);
-
                XFS_BUF_UNDONE(sbp);
                XFS_BUF_UNREAD(sbp);
                XFS_BUF_UNDELAYWRITE(sbp);
@@ -1403,8 +1379,6 @@ xfs_unmountfs_writesb(xfs_mount_t *mp)
                if (error)
                        xfs_ioerror_alert("xfs_unmountfs_writesb",
                                          mp, sbp, XFS_BUF_ADDR(sbp));
-               if (error && mp->m_mk_sharedro)
-                       xfs_fs_cmn_err(CE_ALERT, mp, "Superblock write error 
detected while unmounting.  Filesystem may not be marked shared readonly");
                xfs_buf_relse(sbp);
        }
        return error;
Index: linux-2.6-xfs/fs/xfs/xfs_mount.h
===================================================================
--- linux-2.6-xfs.orig/fs/xfs/xfs_mount.h       2008-10-25 13:18:51.000000000 
+0200
+++ linux-2.6-xfs/fs/xfs/xfs_mount.h    2008-10-25 13:18:54.000000000 +0200
@@ -302,7 +302,6 @@ typedef struct xfs_mount {
        int                     m_sinoalign;    /* stripe unit inode alignment 
*/
        int                     m_attr_magicpct;/* 37% of the blocksize */
        int                     m_dir_magicpct; /* 37% of the dir blocksize */
-       __uint8_t               m_mk_sharedro;  /* mark shared ro on unmount */
        __uint8_t               m_sectbb_log;   /* sectlog - BBSHIFT */
        const struct xfs_nameops *m_dirnameops; /* vector of dir name ops */
        int                     m_dirblksize;   /* directory block sz--bytes */
Index: linux-2.6-xfs/fs/xfs/xfsidbg.c
===================================================================
--- linux-2.6-xfs.orig/fs/xfs/xfsidbg.c 2008-10-25 13:18:51.000000000 +0200
+++ linux-2.6-xfs/fs/xfs/xfsidbg.c      2008-10-25 13:18:54.000000000 +0200
@@ -6523,8 +6523,7 @@ xfsidbg_xmount(xfs_mount_t *mp)
        kdb_printf("dalign %d swidth %d sinoalign %d attr_magicpct %d 
dir_magicpct %d\n",
                mp->m_dalign, mp->m_swidth, mp->m_sinoalign,
                mp->m_attr_magicpct, mp->m_dir_magicpct);
-       kdb_printf("mk_sharedro %d sectbb_log %d\n",
-               mp->m_mk_sharedro, mp->m_sectbb_log);
+       kdb_printf("sectbb_log %d\n", mp->m_sectbb_log);
        kdb_printf("dirblkfsbs %d\n", mp->m_dirblkfsbs);
        kdb_printf("dirblksize %d dirdatablk 0x%Lx dirleafblk 0x%Lx dirfreeblk 
0x%Lx\n",
                mp->m_dirblksize,
Index: linux-2.6-xfs/fs/xfs/linux-2.6/xfs_super.c
===================================================================
--- linux-2.6-xfs.orig/fs/xfs/linux-2.6/xfs_super.c     2008-10-25 
13:20:10.000000000 +0200
+++ linux-2.6-xfs/fs/xfs/linux-2.6/xfs_super.c  2008-10-25 13:20:16.000000000 
+0200
@@ -1384,35 +1384,6 @@ xfs_finish_flags(
                return XFS_ERROR(EROFS);
        }
 
-#if 0 /* shared mounts were never supported on Linux */
-       /*
-        * check for shared mount.
-        */
-       if (ap->flags & XFSMNT_SHARED) {
-               if (!xfs_sb_version_hasshared(&mp->m_sb))
-                       return XFS_ERROR(EINVAL);
-
-               /*
-                * For IRIX 6.5, shared mounts must have the shared
-                * version bit set, have the persistent readonly
-                * field set, must be version 0 and can only be mounted
-                * read-only.
-                */
-               if (!ronly || !(mp->m_sb.sb_flags & XFS_SBF_READONLY) ||
-                    (mp->m_sb.sb_shared_vn != 0))
-                       return XFS_ERROR(EINVAL);
-
-               mp->m_flags |= XFS_MOUNT_SHARED;
-
-               /*
-                * Shared XFS V0 can't deal with DMI.  Return EINVAL.
-                */
-               if (mp->m_sb.sb_shared_vn == 0 &&
-                   (mp->m_flags & XFS_MOUNT_DMAPI))
-                       return XFS_ERROR(EINVAL);
-       }
-#endif
-
        return 0;
 }
 

--