1 files changed, 212 insertions, 8 deletions

diff --git a/fs/exofs/super.c b/fs/exofs/super.c
index 4cd97f526d49..a1d1e77b12eb 100644
--- a/fs/exofs/super.c
+++ b/fs/exofs/super.c
@@ -214,12 +214,17 @@ int exofs_sync_fs(struct super_block *sb, int wait)
         if (ret)
                 goto out;
 
-        ios->length = sizeof(*fscb);
+        /* Note: We only write the changing part of the fscb. .i.e upto the
+         *       the fscb->s_dev_table_oid member. There is no read-modify-write
+         *       here.
+         */
+        ios->length = offsetof(struct exofs_fscb, s_dev_table_oid);
         memset(fscb, 0, ios->length);
         fscb->s_nextid = cpu_to_le64(sbi->s_nextid);
         fscb->s_numfiles = cpu_to_le32(sbi->s_numfiles);
         fscb->s_magic = cpu_to_le16(sb->s_magic);
         fscb->s_newfs = 0;
+        fscb->s_version = EXOFS_FSCB_VER;
 
         ios->obj.id = EXOFS_SUPER_ID;
         ios->offset = 0;
@@ -257,6 +262,20 @@ static void _exofs_print_device(const char *msg, const char *dev_path,
                 msg, dev_path ?: "", odi->osdname, _LLU(pid));
 }
 
+void exofs_free_sbi(struct exofs_sb_info *sbi)
+{
+        while (sbi->s_numdevs) {
+                int i = --sbi->s_numdevs;
+                struct osd_dev *od = sbi->s_ods[i];
+
+                if (od) {
+                        sbi->s_ods[i] = NULL;
+                        osduld_put_device(od);
+                }
+        }
+        kfree(sbi);
+}
+
 /*
  * This function is called when the vfs is freeing the superblock.  We just
  * need to free our own part.
@@ -279,12 +298,182 @@ static void exofs_put_super(struct super_block *sb)
                                   msecs_to_jiffies(100));
         }
 
-        _exofs_print_device("Unmounting", NULL, sbi->s_dev, sbi->s_pid);
-        osduld_put_device(sbi->s_dev);
-        kfree(sb->s_fs_info);
+        _exofs_print_device("Unmounting", NULL, sbi->s_ods[0], sbi->s_pid);
+
+        exofs_free_sbi(sbi);
         sb->s_fs_info = NULL;
 }
 
+static int _read_and_match_data_map(struct exofs_sb_info *sbi, unsigned numdevs,
+                                    struct exofs_device_table *dt)
+{
+        sbi->data_map.odm_num_comps   =
+                                le32_to_cpu(dt->dt_data_map.cb_num_comps);
+        sbi->data_map.odm_stripe_unit =
+                                le64_to_cpu(dt->dt_data_map.cb_stripe_unit);
+        sbi->data_map.odm_group_width =
+                                le32_to_cpu(dt->dt_data_map.cb_group_width);
+        sbi->data_map.odm_group_depth =
+                                le32_to_cpu(dt->dt_data_map.cb_group_depth);
+        sbi->data_map.odm_mirror_cnt  =
+                                le32_to_cpu(dt->dt_data_map.cb_mirror_cnt);
+        sbi->data_map.odm_raid_algorithm  =
+                                le32_to_cpu(dt->dt_data_map.cb_raid_algorithm);
+
+/* FIXME: Hard coded mirror only for now. if not so do not mount */
+        if ((sbi->data_map.odm_num_comps != numdevs) ||
+            (sbi->data_map.odm_stripe_unit != EXOFS_BLKSIZE) ||
+            (sbi->data_map.odm_raid_algorithm != PNFS_OSD_RAID_0) ||
+            (sbi->data_map.odm_mirror_cnt != (numdevs - 1)))
+                return -EINVAL;
+        else
+                return 0;
+}
+
+/* @odi is valid only as long as @fscb_dev is valid */
+static int exofs_devs_2_odi(struct exofs_dt_device_info *dt_dev,
+                             struct osd_dev_info *odi)
+{
+        odi->systemid_len = le32_to_cpu(dt_dev->systemid_len);
+        memcpy(odi->systemid, dt_dev->systemid, odi->systemid_len);
+
+        odi->osdname_len = le32_to_cpu(dt_dev->osdname_len);
+        odi->osdname = dt_dev->osdname;
+
+        /* FIXME support long names. Will need a _put function */
+        if (dt_dev->long_name_offset)
+                return -EINVAL;
+
+        /* Make sure osdname is printable!
+         * mkexofs should give us space for a null-terminator else the
+         * device-table is invalid.
+         */
+        if (unlikely(odi->osdname_len >= sizeof(dt_dev->osdname)))
+                odi->osdname_len = sizeof(dt_dev->osdname) - 1;
+        dt_dev->osdname[odi->osdname_len] = 0;
+
+        /* If it's all zeros something is bad we read past end-of-obj */
+        return !(odi->systemid_len || odi->osdname_len);
+}
+
+static int exofs_read_lookup_dev_table(struct exofs_sb_info **psbi,
+                                       unsigned table_count)
+{
+        struct exofs_sb_info *sbi = *psbi;
+        struct osd_dev *fscb_od;
+        struct osd_obj_id obj = {.partition = sbi->s_pid,
+                                 .id = EXOFS_DEVTABLE_ID};
+        struct exofs_device_table *dt;
+        unsigned table_bytes = table_count * sizeof(dt->dt_dev_table[0]) +
+                                             sizeof(*dt);
+        unsigned numdevs, i;
+        int ret;
+
+        dt = kmalloc(table_bytes, GFP_KERNEL);
+        if (unlikely(!dt)) {
+                EXOFS_ERR("ERROR: allocating %x bytes for device table\n",
+                          table_bytes);
+                return -ENOMEM;
+        }
+
+        fscb_od = sbi->s_ods[0];
+        sbi->s_ods[0] = NULL;
+        sbi->s_numdevs = 0;
+        ret = exofs_read_kern(fscb_od, sbi->s_cred, &obj, 0, dt, table_bytes);
+        if (unlikely(ret)) {
+                EXOFS_ERR("ERROR: reading device table\n");
+                goto out;
+        }
+
+        numdevs = le64_to_cpu(dt->dt_num_devices);
+        if (unlikely(!numdevs)) {
+                ret = -EINVAL;
+                goto out;
+        }
+        WARN_ON(table_count != numdevs);
+
+        ret = _read_and_match_data_map(sbi, numdevs, dt);
+        if (unlikely(ret))
+                goto out;
+
+        if (likely(numdevs > 1)) {
+                unsigned size = numdevs * sizeof(sbi->s_ods[0]);
+
+                sbi = krealloc(sbi, sizeof(*sbi) + size, GFP_KERNEL);
+                if (unlikely(!sbi)) {
+                        ret = -ENOMEM;
+                        goto out;
+                }
+                memset(&sbi->s_ods[1], 0, size - sizeof(sbi->s_ods[0]));
+                *psbi = sbi;
+        }
+
+        for (i = 0; i < numdevs; i++) {
+                struct exofs_fscb fscb;
+                struct osd_dev_info odi;
+                struct osd_dev *od;
+
+                if (exofs_devs_2_odi(&dt->dt_dev_table[i], &odi)) {
+                        EXOFS_ERR("ERROR: Read all-zeros device entry\n");
+                        ret = -EINVAL;
+                        goto out;
+                }
+
+                printk(KERN_NOTICE "Add device[%d]: osd_name-%s\n",
+                       i, odi.osdname);
+
+                /* On all devices the device table is identical. The user can
+                 * specify any one of the participating devices on the command
+                 * line. We always keep them in device-table order.
+                 */
+                if (fscb_od && osduld_device_same(fscb_od, &odi)) {
+                        sbi->s_ods[i] = fscb_od;
+                        ++sbi->s_numdevs;
+                        fscb_od = NULL;
+                        continue;
+                }
+
+                od = osduld_info_lookup(&odi);
+                if (unlikely(IS_ERR(od))) {
+                        ret = PTR_ERR(od);
+                        EXOFS_ERR("ERROR: device requested is not found "
+                                  "osd_name-%s =>%d\n", odi.osdname, ret);
+                        goto out;
+                }
+
+                sbi->s_ods[i] = od;
+                ++sbi->s_numdevs;
+
+                /* Read the fscb of the other devices to make sure the FS
+                 * partition is there.
+                 */
+                ret = exofs_read_kern(od, sbi->s_cred, &obj, 0, &fscb,
+                                      sizeof(fscb));
+                if (unlikely(ret)) {
+                        EXOFS_ERR("ERROR: Malformed participating device "
+                                  "error reading fscb osd_name-%s\n",
+                                  odi.osdname);
+                        goto out;
+                }
+
+                /* TODO: verify other information is correct and FS-uuid
+                 *       matches. Benny what did you say about device table
+                 *       generation and old devices?
+                 */
+        }
+
+out:
+        kfree(dt);
+        if (unlikely(!ret && fscb_od)) {
+                EXOFS_ERR(
+                      "ERROR: Bad device-table container device not present\n");
+                osduld_put_device(fscb_od);
+                ret = -EINVAL;
+        }
+
+        return ret;
+}
+
 /*
  * Read the superblock from the OSD and fill in the fields
  */
@@ -296,6 +485,7 @@ static int exofs_fill_super(struct super_block *sb, void *data, int silent)
         struct osd_dev *od;             /* Master device                 */
         struct exofs_fscb fscb;         /*on-disk superblock info        */
         struct osd_obj_id obj;
+        unsigned table_count;
         int ret;
 
         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
@@ -309,7 +499,8 @@ static int exofs_fill_super(struct super_block *sb, void *data, int silent)
                 goto free_sbi;
         }
 
-        sbi->s_dev = od;
+        sbi->s_ods[0] = od;
+        sbi->s_numdevs = 1;
         sbi->s_pid = opts->pid;
         sbi->s_timeout = opts->timeout;
 
@@ -342,11 +533,24 @@ static int exofs_fill_super(struct super_block *sb, void *data, int silent)
                 ret = -EINVAL;
                 goto free_sbi;
         }
+        if (le32_to_cpu(fscb.s_version) != EXOFS_FSCB_VER) {
+                EXOFS_ERR("ERROR: Bad FSCB version expected-%d got-%d\n",
+                          EXOFS_FSCB_VER, le32_to_cpu(fscb.s_version));
+                ret = -EINVAL;
+                goto free_sbi;
+        }
 
         /* start generation numbers from a random point */
         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
         spin_lock_init(&sbi->s_next_gen_lock);
 
+        table_count = le64_to_cpu(fscb.s_dev_table_count);
+        if (table_count) {
+                ret = exofs_read_lookup_dev_table(&sbi, table_count);
+                if (unlikely(ret))
+                        goto free_sbi;
+        }
+
         /* set up operation vectors */
         sb->s_fs_info = sbi;
         sb->s_op = &exofs_sops;
@@ -374,14 +578,14 @@ static int exofs_fill_super(struct super_block *sb, void *data, int silent)
                 goto free_sbi;
         }
 
-        _exofs_print_device("Mounting", opts->dev_name, sbi->s_dev, sbi->s_pid);
+        _exofs_print_device("Mounting", opts->dev_name, sbi->s_ods[0],
+                            sbi->s_pid);
         return 0;
 
 free_sbi:
         EXOFS_ERR("Unable to mount exofs on %s pid=0x%llx err=%d\n",
                   opts->dev_name, sbi->s_pid, ret);
-        osduld_put_device(sbi->s_dev); /* NULL safe */
-        kfree(sbi);
+        exofs_free_sbi(sbi);
         return ret;
 }