[XFS] merge xfs_mount into xfs_fs_fill_super

xfs_mount is already pretty linux-specific so merge it into
xfs_fs_fill_super to allow for a more structured mount code in the next
patches. xfs_start_flags and xfs_finish_flags also move to xfs_super.c.

SGI-PV: 981951
SGI-Modid: xfs-linux-melb:xfs-kern:31189a

Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>

1 files changed, 355 insertions, 5 deletions

diff --git a/fs/xfs/linux-2.6/xfs_super.c b/fs/xfs/linux-2.6/xfs_super.c
index 28132e643953..4b6ddf88d44e 100644
--- a/fs/xfs/linux-2.6/xfs_super.c
+++ b/fs/xfs/linux-2.6/xfs_super.c
@@ -1366,6 +1366,235 @@ xfs_fs_setxquota(
                                    Q_XSETPQLIM), id, (caddr_t)fdq);
 }
 
+/*
+ * This function fills in xfs_mount_t fields based on mount args.
+ * Note: the superblock has _not_ yet been read in.
+ */
+STATIC int
+xfs_start_flags(
+        struct xfs_mount_args   *ap,
+        struct xfs_mount        *mp)
+{
+        /* Values are in BBs */
+        if ((ap->flags & XFSMNT_NOALIGN) != XFSMNT_NOALIGN) {
+                /*
+                 * At this point the superblock has not been read
+                 * in, therefore we do not know the block size.
+                 * Before the mount call ends we will convert
+                 * these to FSBs.
+                 */
+                mp->m_dalign = ap->sunit;
+                mp->m_swidth = ap->swidth;
+        }
+
+        if (ap->logbufs != -1 &&
+            ap->logbufs != 0 &&
+            (ap->logbufs < XLOG_MIN_ICLOGS ||
+             ap->logbufs > XLOG_MAX_ICLOGS)) {
+                cmn_err(CE_WARN,
+                        "XFS: invalid logbufs value: %d [not %d-%d]",
+                        ap->logbufs, XLOG_MIN_ICLOGS, XLOG_MAX_ICLOGS);
+                return XFS_ERROR(EINVAL);
+        }
+        mp->m_logbufs = ap->logbufs;
+        if (ap->logbufsize != -1 &&
+            ap->logbufsize !=  0 &&
+            (ap->logbufsize < XLOG_MIN_RECORD_BSIZE ||
+             ap->logbufsize > XLOG_MAX_RECORD_BSIZE ||
+             !is_power_of_2(ap->logbufsize))) {
+                cmn_err(CE_WARN,
+        "XFS: invalid logbufsize: %d [not 16k,32k,64k,128k or 256k]",
+                        ap->logbufsize);
+                return XFS_ERROR(EINVAL);
+        }
+        mp->m_logbsize = ap->logbufsize;
+        mp->m_fsname_len = strlen(ap->fsname) + 1;
+        mp->m_fsname = kmem_alloc(mp->m_fsname_len, KM_SLEEP);
+        strcpy(mp->m_fsname, ap->fsname);
+        if (ap->rtname[0]) {
+                mp->m_rtname = kmem_alloc(strlen(ap->rtname) + 1, KM_SLEEP);
+                strcpy(mp->m_rtname, ap->rtname);
+        }
+        if (ap->logname[0]) {
+                mp->m_logname = kmem_alloc(strlen(ap->logname) + 1, KM_SLEEP);
+                strcpy(mp->m_logname, ap->logname);
+        }
+
+        if (ap->flags & XFSMNT_WSYNC)
+                mp->m_flags |= XFS_MOUNT_WSYNC;
+#if XFS_BIG_INUMS
+        if (ap->flags & XFSMNT_INO64) {
+                mp->m_flags |= XFS_MOUNT_INO64;
+                mp->m_inoadd = XFS_INO64_OFFSET;
+        }
+#endif
+        if (ap->flags & XFSMNT_RETERR)
+                mp->m_flags |= XFS_MOUNT_RETERR;
+        if (ap->flags & XFSMNT_NOALIGN)
+                mp->m_flags |= XFS_MOUNT_NOALIGN;
+        if (ap->flags & XFSMNT_SWALLOC)
+                mp->m_flags |= XFS_MOUNT_SWALLOC;
+        if (ap->flags & XFSMNT_OSYNCISOSYNC)
+                mp->m_flags |= XFS_MOUNT_OSYNCISOSYNC;
+        if (ap->flags & XFSMNT_32BITINODES)
+                mp->m_flags |= XFS_MOUNT_32BITINODES;
+
+        if (ap->flags & XFSMNT_IOSIZE) {
+                if (ap->iosizelog > XFS_MAX_IO_LOG ||
+                    ap->iosizelog < XFS_MIN_IO_LOG) {
+                        cmn_err(CE_WARN,
+                "XFS: invalid log iosize: %d [not %d-%d]",
+                                ap->iosizelog, XFS_MIN_IO_LOG,
+                                XFS_MAX_IO_LOG);
+                        return XFS_ERROR(EINVAL);
+                }
+
+                mp->m_flags |= XFS_MOUNT_DFLT_IOSIZE;
+                mp->m_readio_log = mp->m_writeio_log = ap->iosizelog;
+        }
+
+        if (ap->flags & XFSMNT_IKEEP)
+                mp->m_flags |= XFS_MOUNT_IKEEP;
+        if (ap->flags & XFSMNT_DIRSYNC)
+                mp->m_flags |= XFS_MOUNT_DIRSYNC;
+        if (ap->flags & XFSMNT_ATTR2)
+                mp->m_flags |= XFS_MOUNT_ATTR2;
+        if (ap->flags & XFSMNT_NOATTR2)
+                mp->m_flags |= XFS_MOUNT_NOATTR2;
+
+        if (ap->flags2 & XFSMNT2_COMPAT_IOSIZE)
+                mp->m_flags |= XFS_MOUNT_COMPAT_IOSIZE;
+
+        /*
+         * no recovery flag requires a read-only mount
+         */
+        if (ap->flags & XFSMNT_NORECOVERY) {
+                if (!(mp->m_flags & XFS_MOUNT_RDONLY)) {
+                        cmn_err(CE_WARN,
+        "XFS: tried to mount a FS read-write without recovery!");
+                        return XFS_ERROR(EINVAL);
+                }
+                mp->m_flags |= XFS_MOUNT_NORECOVERY;
+        }
+
+        if (ap->flags & XFSMNT_NOUUID)
+                mp->m_flags |= XFS_MOUNT_NOUUID;
+        if (ap->flags & XFSMNT_BARRIER)
+                mp->m_flags |= XFS_MOUNT_BARRIER;
+        else
+                mp->m_flags &= ~XFS_MOUNT_BARRIER;
+
+        if (ap->flags2 & XFSMNT2_FILESTREAMS)
+                mp->m_flags |= XFS_MOUNT_FILESTREAMS;
+
+        if (ap->flags & XFSMNT_DMAPI)
+                mp->m_flags |= XFS_MOUNT_DMAPI;
+        return 0;
+}
+
+/*
+ * This function fills in xfs_mount_t fields based on mount args.
+ * Note: the superblock _has_ now been read in.
+ */
+STATIC int
+xfs_finish_flags(
+        struct xfs_mount_args   *ap,
+        struct xfs_mount        *mp)
+{
+        int                     ronly = (mp->m_flags & XFS_MOUNT_RDONLY);
+
+        /* Fail a mount where the logbuf is smaller then the log stripe */
+        if (xfs_sb_version_haslogv2(&mp->m_sb)) {
+                if ((ap->logbufsize <= 0) &&
+                    (mp->m_sb.sb_logsunit > XLOG_BIG_RECORD_BSIZE)) {
+                        mp->m_logbsize = mp->m_sb.sb_logsunit;
+                } else if (ap->logbufsize > 0 &&
+                           ap->logbufsize < mp->m_sb.sb_logsunit) {
+                        cmn_err(CE_WARN,
+        "XFS: logbuf size must be greater than or equal to log stripe size");
+                        return XFS_ERROR(EINVAL);
+                }
+        } else {
+                /* Fail a mount if the logbuf is larger than 32K */
+                if (ap->logbufsize > XLOG_BIG_RECORD_BSIZE) {
+                        cmn_err(CE_WARN,
+        "XFS: logbuf size for version 1 logs must be 16K or 32K");
+                        return XFS_ERROR(EINVAL);
+                }
+        }
+
+        /*
+         * mkfs'ed attr2 will turn on attr2 mount unless explicitly
+         * told by noattr2 to turn it off
+         */
+        if (xfs_sb_version_hasattr2(&mp->m_sb) &&
+            !(ap->flags & XFSMNT_NOATTR2))
+                mp->m_flags |= XFS_MOUNT_ATTR2;
+
+        /*
+         * prohibit r/w mounts of read-only filesystems
+         */
+        if ((mp->m_sb.sb_flags & XFS_SBF_READONLY) && !ronly) {
+                cmn_err(CE_WARN,
+        "XFS: cannot mount a read-only filesystem as read-write");
+                return XFS_ERROR(EROFS);
+        }
+
+        /*
+         * 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 && (ap->flags & XFSMNT_DMAPI))
+                        return XFS_ERROR(EINVAL);
+        }
+
+        if (ap->flags & XFSMNT_UQUOTA) {
+                mp->m_qflags |= (XFS_UQUOTA_ACCT | XFS_UQUOTA_ACTIVE);
+                if (ap->flags & XFSMNT_UQUOTAENF)
+                        mp->m_qflags |= XFS_UQUOTA_ENFD;
+        }
+
+        if (ap->flags & XFSMNT_GQUOTA) {
+                mp->m_qflags |= (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE);
+                if (ap->flags & XFSMNT_GQUOTAENF)
+                        mp->m_qflags |= XFS_OQUOTA_ENFD;
+        } else if (ap->flags & XFSMNT_PQUOTA) {
+                mp->m_qflags |= (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE);
+                if (ap->flags & XFSMNT_PQUOTAENF)
+                        mp->m_qflags |= XFS_OQUOTA_ENFD;
+        }
+
+        return 0;
+}
+
+/*
+ * The file system configurations are:
+ *      (1) device (partition) with data and internal log
+ *      (2) logical volume with data and log subvolumes.
+ *      (3) logical volume with data, log, and realtime subvolumes.
+ *
+ * We only have to handle opening the log and realtime volumes here if
+ * they are present.  The data subvolume has already been opened by
+ * get_sb_bdev() and is stored in vfsp->vfs_super->s_bdev.
+ */
 STATIC int
 xfs_fs_fill_super(
         struct super_block      *sb,
@@ -1375,7 +1604,9 @@ xfs_fs_fill_super(
         struct inode            *root;
         struct xfs_mount        *mp = NULL;
         struct xfs_mount_args   *args = xfs_args_allocate(sb, silent);
-        int                     error;
+        struct block_device     *ddev = sb->s_bdev;
+        struct block_device     *logdev = NULL, *rtdev = NULL;
+        int                     flags = 0, error;
 
         mp = xfs_mount_init();
 
@@ -1398,10 +1629,114 @@ xfs_fs_fill_super(
         sb->s_qcop = &xfs_quotactl_operations;
         sb->s_op = &xfs_super_operations;
 
-        error = xfs_mount(mp, args, NULL);
+        error = xfs_dmops_get(mp, args);
+        if (error)
+                goto fail_vfsop;
+        error = xfs_qmops_get(mp, args);
         if (error)
                 goto fail_vfsop;
 
+        if (args->flags & XFSMNT_QUIET)
+                flags |= XFS_MFSI_QUIET;
+
+        /*
+         * Open real time and log devices - order is important.
+         */
+        if (args->logname[0]) {
+                error = xfs_blkdev_get(mp, args->logname, &logdev);
+                if (error)
+                        goto fail_vfsop;
+        }
+        if (args->rtname[0]) {
+                error = xfs_blkdev_get(mp, args->rtname, &rtdev);
+                if (error) {
+                        xfs_blkdev_put(logdev);
+                        goto fail_vfsop;
+                }
+
+                if (rtdev == ddev || rtdev == logdev) {
+                        cmn_err(CE_WARN,
+        "XFS: Cannot mount filesystem with identical rtdev and ddev/logdev.");
+                        xfs_blkdev_put(logdev);
+                        xfs_blkdev_put(rtdev);
+                        error = EINVAL;
+                        goto fail_vfsop;
+                }
+        }
+
+        /*
+         * Setup xfs_mount buffer target pointers
+         */
+        error = ENOMEM;
+        mp->m_ddev_targp = xfs_alloc_buftarg(ddev, 0);
+        if (!mp->m_ddev_targp) {
+                xfs_blkdev_put(logdev);
+                xfs_blkdev_put(rtdev);
+                goto fail_vfsop;
+        }
+        if (rtdev) {
+                mp->m_rtdev_targp = xfs_alloc_buftarg(rtdev, 1);
+                if (!mp->m_rtdev_targp) {
+                        xfs_blkdev_put(logdev);
+                        xfs_blkdev_put(rtdev);
+                        goto error0;
+                }
+        }
+        mp->m_logdev_targp = (logdev && logdev != ddev) ?
+                                xfs_alloc_buftarg(logdev, 1) : mp->m_ddev_targp;
+        if (!mp->m_logdev_targp) {
+                xfs_blkdev_put(logdev);
+                xfs_blkdev_put(rtdev);
+                goto error0;
+        }
+
+        /*
+         * Setup flags based on mount(2) options and then the superblock
+         */
+        error = xfs_start_flags(args, mp);
+        if (error)
+                goto error1;
+        error = xfs_readsb(mp, flags);
+        if (error)
+                goto error1;
+        error = xfs_finish_flags(args, mp);
+        if (error)
+                goto error2;
+
+        /*
+         * Setup xfs_mount buffer target pointers based on superblock
+         */
+        error = xfs_setsize_buftarg(mp->m_ddev_targp, mp->m_sb.sb_blocksize,
+                                    mp->m_sb.sb_sectsize);
+        if (!error && logdev && logdev != ddev) {
+                unsigned int    log_sector_size = BBSIZE;
+
+                if (xfs_sb_version_hassector(&mp->m_sb))
+                        log_sector_size = mp->m_sb.sb_logsectsize;
+                error = xfs_setsize_buftarg(mp->m_logdev_targp,
+                                            mp->m_sb.sb_blocksize,
+                                            log_sector_size);
+        }
+        if (!error && rtdev)
+                error = xfs_setsize_buftarg(mp->m_rtdev_targp,
+                                            mp->m_sb.sb_blocksize,
+                                            mp->m_sb.sb_sectsize);
+        if (error)
+                goto error2;
+
+        if (mp->m_flags & XFS_MOUNT_BARRIER)
+                xfs_mountfs_check_barriers(mp);
+
+        error = xfs_filestream_mount(mp);
+        if (error)
+                goto error2;
+
+        error = xfs_mountfs(mp, flags);
+        if (error)
+                goto error2;
+
+        XFS_SEND_MOUNT(mp, DM_RIGHT_NULL, args->mtpt, args->fsname);
+
         sb->s_dirt = 1;
         sb->s_magic = XFS_SB_MAGIC;
         sb->s_blocksize = mp->m_sb.sb_blocksize;
@@ -1438,7 +1773,22 @@ xfs_fs_fill_super(
         kmem_free(args);
         return 0;
 
-fail_vnrele:
+ error2:
+        if (mp->m_sb_bp)
+                xfs_freesb(mp);
+ error1:
+        xfs_binval(mp->m_ddev_targp);
+        if (logdev && logdev != ddev)
+                xfs_binval(mp->m_logdev_targp);
+        if (rtdev)
+                xfs_binval(mp->m_rtdev_targp);
+ error0:
+        xfs_unmountfs_close(mp, NULL);
+        xfs_qmops_put(mp);
+        xfs_dmops_put(mp);
+        goto fail_vfsop;
+
+ fail_vnrele:
         if (sb->s_root) {
                 dput(sb->s_root);
                 sb->s_root = NULL;
@@ -1446,7 +1796,7 @@ fail_vnrele:
                 iput(root);
         }
 
-fail_unmount:
+ fail_unmount:
         /*
          * Blow away any referenced inode in the filestreams cache.
          * This can and will cause log traffic as inodes go inactive
@@ -1465,7 +1815,7 @@ fail_unmount:
         xfs_dmops_put(mp);
         kmem_free(mp);
 
-fail_vfsop:
+ fail_vfsop:
         kmem_free(args);
         return -error;
 }