exofs: super_operations and file_system_type

This patch ties all operation vectors into a file system superblock
and registers the exofs file_system_type at module's load time.

* The file system control block (AKA on-disk superblock) resides in
  an object with a special ID (defined in common.h).
  Information included in the file system control block is used to
  fill the in-memory superblock structure at mount time. This object
  is created before the file system is used by mkexofs.c It contains
  information such as:
	- The file system's magic number
	- The next inode number to be allocated

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>

1 files changed, 531 insertions, 0 deletions

diff --git a/fs/exofs/super.c b/fs/exofs/super.c
new file mode 100644
index 000000000000..b736b117a2a4
--- /dev/null
+++ b/fs/exofs/super.c
@@ -0,0 +1,531 @@
+/*
+ * Copyright (C) 2005, 2006
+ * Avishay Traeger (avishay@gmail.com) (avishay@il.ibm.com)
+ * Copyright (C) 2005, 2006
+ * International Business Machines
+ * Copyright (C) 2008, 2009
+ * Boaz Harrosh <bharrosh@panasas.com>
+ *
+ * Copyrights for code taken from ext2:
+ *     Copyright (C) 1992, 1993, 1994, 1995
+ *     Remy Card (card@masi.ibp.fr)
+ *     Laboratoire MASI - Institut Blaise Pascal
+ *     Universite Pierre et Marie Curie (Paris VI)
+ *     from
+ *     linux/fs/minix/inode.c
+ *     Copyright (C) 1991, 1992  Linus Torvalds
+ *
+ * This file is part of exofs.
+ *
+ * exofs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation.  Since it is based on ext2, and the only
+ * valid version of GPL for the Linux kernel is version 2, the only valid
+ * version of GPL for exofs is version 2.
+ *
+ * exofs is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with exofs; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <linux/string.h>
+#include <linux/parser.h>
+#include <linux/vfs.h>
+#include <linux/random.h>
+
+#include "exofs.h"
+
+/******************************************************************************
+ * MOUNT OPTIONS
+ *****************************************************************************/
+
+/*
+ * struct to hold what we get from mount options
+ */
+struct exofs_mountopt {
+        const char *dev_name;
+        uint64_t pid;
+        int timeout;
+};
+
+/*
+ * exofs-specific mount-time options.
+ */
+enum { Opt_pid, Opt_to, Opt_mkfs, Opt_format, Opt_err };
+
+/*
+ * Our mount-time options.  These should ideally be 64-bit unsigned, but the
+ * kernel's parsing functions do not currently support that.  32-bit should be
+ * sufficient for most applications now.
+ */
+static match_table_t tokens = {
+        {Opt_pid, "pid=%u"},
+        {Opt_to, "to=%u"},
+        {Opt_err, NULL}
+};
+
+/*
+ * The main option parsing method.  Also makes sure that all of the mandatory
+ * mount options were set.
+ */
+static int parse_options(char *options, struct exofs_mountopt *opts)
+{
+        char *p;
+        substring_t args[MAX_OPT_ARGS];
+        int option;
+        bool s_pid = false;
+
+        EXOFS_DBGMSG("parse_options %s\n", options);
+        /* defaults */
+        memset(opts, 0, sizeof(*opts));
+        opts->timeout = BLK_DEFAULT_SG_TIMEOUT;
+
+        while ((p = strsep(&options, ",")) != NULL) {
+                int token;
+                char str[32];
+
+                if (!*p)
+                        continue;
+
+                token = match_token(p, tokens, args);
+                switch (token) {
+                case Opt_pid:
+                        if (0 == match_strlcpy(str, &args[0], sizeof(str)))
+                                return -EINVAL;
+                        opts->pid = simple_strtoull(str, NULL, 0);
+                        if (opts->pid < EXOFS_MIN_PID) {
+                                EXOFS_ERR("Partition ID must be >= %u",
+                                          EXOFS_MIN_PID);
+                                return -EINVAL;
+                        }
+                        s_pid = 1;
+                        break;
+                case Opt_to:
+                        if (match_int(&args[0], &option))
+                                return -EINVAL;
+                        if (option <= 0) {
+                                EXOFS_ERR("Timout must be > 0");
+                                return -EINVAL;
+                        }
+                        opts->timeout = option * HZ;
+                        break;
+                }
+        }
+
+        if (!s_pid) {
+                EXOFS_ERR("Need to specify the following options:\n");
+                EXOFS_ERR("    -o pid=pid_no_to_use\n");
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+/******************************************************************************
+ * INODE CACHE
+ *****************************************************************************/
+
+/*
+ * Our inode cache.  Isn't it pretty?
+ */
+static struct kmem_cache *exofs_inode_cachep;
+
+/*
+ * Allocate an inode in the cache
+ */
+static struct inode *exofs_alloc_inode(struct super_block *sb)
+{
+        struct exofs_i_info *oi;
+
+        oi = kmem_cache_alloc(exofs_inode_cachep, GFP_KERNEL);
+        if (!oi)
+                return NULL;
+
+        oi->vfs_inode.i_version = 1;
+        return &oi->vfs_inode;
+}
+
+/*
+ * Remove an inode from the cache
+ */
+static void exofs_destroy_inode(struct inode *inode)
+{
+        kmem_cache_free(exofs_inode_cachep, exofs_i(inode));
+}
+
+/*
+ * Initialize the inode
+ */
+static void exofs_init_once(void *foo)
+{
+        struct exofs_i_info *oi = foo;
+
+        inode_init_once(&oi->vfs_inode);
+}
+
+/*
+ * Create and initialize the inode cache
+ */
+static int init_inodecache(void)
+{
+        exofs_inode_cachep = kmem_cache_create("exofs_inode_cache",
+                                sizeof(struct exofs_i_info), 0,
+                                SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD,
+                                exofs_init_once);
+        if (exofs_inode_cachep == NULL)
+                return -ENOMEM;
+        return 0;
+}
+
+/*
+ * Destroy the inode cache
+ */
+static void destroy_inodecache(void)
+{
+        kmem_cache_destroy(exofs_inode_cachep);
+}
+
+/******************************************************************************
+ * SUPERBLOCK FUNCTIONS
+ *****************************************************************************/
+static const struct super_operations exofs_sops;
+
+/*
+ * Write the superblock to the OSD
+ */
+static void exofs_write_super(struct super_block *sb)
+{
+        struct exofs_sb_info *sbi;
+        struct exofs_fscb *fscb;
+        struct osd_request *or;
+        struct osd_obj_id obj;
+        int ret;
+
+        fscb = kzalloc(sizeof(struct exofs_fscb), GFP_KERNEL);
+        if (!fscb) {
+                EXOFS_ERR("exofs_write_super: memory allocation failed.\n");
+                return;
+        }
+
+        lock_kernel();
+        sbi = sb->s_fs_info;
+        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;
+
+        or = osd_start_request(sbi->s_dev, GFP_KERNEL);
+        if (unlikely(!or)) {
+                EXOFS_ERR("exofs_write_super: osd_start_request failed.\n");
+                goto out;
+        }
+
+        obj.partition = sbi->s_pid;
+        obj.id = EXOFS_SUPER_ID;
+        ret = osd_req_write_kern(or, &obj, 0, fscb, sizeof(*fscb));
+        if (unlikely(ret)) {
+                EXOFS_ERR("exofs_write_super: osd_req_write_kern failed.\n");
+                goto out;
+        }
+
+        ret = exofs_sync_op(or, sbi->s_timeout, sbi->s_cred);
+        if (unlikely(ret)) {
+                EXOFS_ERR("exofs_write_super: exofs_sync_op failed.\n");
+                goto out;
+        }
+        sb->s_dirt = 0;
+
+out:
+        if (or)
+                osd_end_request(or);
+        unlock_kernel();
+        kfree(fscb);
+}
+
+/*
+ * This function is called when the vfs is freeing the superblock.  We just
+ * need to free our own part.
+ */
+static void exofs_put_super(struct super_block *sb)
+{
+        int num_pend;
+        struct exofs_sb_info *sbi = sb->s_fs_info;
+
+        /* make sure there are no pending commands */
+        for (num_pend = atomic_read(&sbi->s_curr_pending); num_pend > 0;
+             num_pend = atomic_read(&sbi->s_curr_pending)) {
+                wait_queue_head_t wq;
+                init_waitqueue_head(&wq);
+                wait_event_timeout(wq,
+                                  (atomic_read(&sbi->s_curr_pending) == 0),
+                                  msecs_to_jiffies(100));
+        }
+
+        osduld_put_device(sbi->s_dev);
+        kfree(sb->s_fs_info);
+        sb->s_fs_info = NULL;
+}
+
+/*
+ * Read the superblock from the OSD and fill in the fields
+ */
+static int exofs_fill_super(struct super_block *sb, void *data, int silent)
+{
+        struct inode *root;
+        struct exofs_mountopt *opts = data;
+        struct exofs_sb_info *sbi;      /*extended info                  */
+        struct exofs_fscb fscb;         /*on-disk superblock info        */
+        struct osd_request *or = NULL;
+        struct osd_obj_id obj;
+        int ret;
+
+        sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
+        if (!sbi)
+                return -ENOMEM;
+        sb->s_fs_info = sbi;
+
+        /* use mount options to fill superblock */
+        sbi->s_dev = osduld_path_lookup(opts->dev_name);
+        if (IS_ERR(sbi->s_dev)) {
+                ret = PTR_ERR(sbi->s_dev);
+                sbi->s_dev = NULL;
+                goto free_sbi;
+        }
+
+        sbi->s_pid = opts->pid;
+        sbi->s_timeout = opts->timeout;
+
+        /* fill in some other data by hand */
+        memset(sb->s_id, 0, sizeof(sb->s_id));
+        strcpy(sb->s_id, "exofs");
+        sb->s_blocksize = EXOFS_BLKSIZE;
+        sb->s_blocksize_bits = EXOFS_BLKSHIFT;
+        sb->s_maxbytes = MAX_LFS_FILESIZE;
+        atomic_set(&sbi->s_curr_pending, 0);
+        sb->s_bdev = NULL;
+        sb->s_dev = 0;
+
+        /* read data from on-disk superblock object */
+        obj.partition = sbi->s_pid;
+        obj.id = EXOFS_SUPER_ID;
+        exofs_make_credential(sbi->s_cred, &obj);
+
+        or = osd_start_request(sbi->s_dev, GFP_KERNEL);
+        if (unlikely(!or)) {
+                if (!silent)
+                        EXOFS_ERR(
+                               "exofs_fill_super: osd_start_request failed.\n");
+                ret = -ENOMEM;
+                goto free_sbi;
+        }
+        ret = osd_req_read_kern(or, &obj, 0, &fscb, sizeof(fscb));
+        if (unlikely(ret)) {
+                if (!silent)
+                        EXOFS_ERR(
+                               "exofs_fill_super: osd_req_read_kern failed.\n");
+                ret = -ENOMEM;
+                goto free_sbi;
+        }
+
+        ret = exofs_sync_op(or, sbi->s_timeout, sbi->s_cred);
+        if (unlikely(ret)) {
+                if (!silent)
+                        EXOFS_ERR("exofs_fill_super: exofs_sync_op failed.\n");
+                ret = -EIO;
+                goto free_sbi;
+        }
+
+        sb->s_magic = le16_to_cpu(fscb.s_magic);
+        sbi->s_nextid = le64_to_cpu(fscb.s_nextid);
+        sbi->s_numfiles = le32_to_cpu(fscb.s_numfiles);
+
+        /* make sure what we read from the object store is correct */
+        if (sb->s_magic != EXOFS_SUPER_MAGIC) {
+                if (!silent)
+                        EXOFS_ERR("ERROR: Bad magic value\n");
+                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);
+
+        /* set up operation vectors */
+        sb->s_op = &exofs_sops;
+        root = exofs_iget(sb, EXOFS_ROOT_ID - EXOFS_OBJ_OFF);
+        if (IS_ERR(root)) {
+                EXOFS_ERR("ERROR: exofs_iget failed\n");
+                ret = PTR_ERR(root);
+                goto free_sbi;
+        }
+        sb->s_root = d_alloc_root(root);
+        if (!sb->s_root) {
+                iput(root);
+                EXOFS_ERR("ERROR: get root inode failed\n");
+                ret = -ENOMEM;
+                goto free_sbi;
+        }
+
+        if (!S_ISDIR(root->i_mode)) {
+                dput(sb->s_root);
+                sb->s_root = NULL;
+                EXOFS_ERR("ERROR: corrupt root inode (mode = %hd)\n",
+                       root->i_mode);
+                ret = -EINVAL;
+                goto free_sbi;
+        }
+
+        ret = 0;
+out:
+        if (or)
+                osd_end_request(or);
+        return ret;
+
+free_sbi:
+        osduld_put_device(sbi->s_dev); /* NULL safe */
+        kfree(sbi);
+        goto out;
+}
+
+/*
+ * Set up the superblock (calls exofs_fill_super eventually)
+ */
+static int exofs_get_sb(struct file_system_type *type,
+                          int flags, const char *dev_name,
+                          void *data, struct vfsmount *mnt)
+{
+        struct exofs_mountopt opts;
+        int ret;
+
+        ret = parse_options(data, &opts);
+        if (ret)
+                return ret;
+
+        opts.dev_name = dev_name;
+        return get_sb_nodev(type, flags, &opts, exofs_fill_super, mnt);
+}
+
+/*
+ * Return information about the file system state in the buffer.  This is used
+ * by the 'df' command, for example.
+ */
+static int exofs_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+        struct super_block *sb = dentry->d_sb;
+        struct exofs_sb_info *sbi = sb->s_fs_info;
+        struct osd_obj_id obj = {sbi->s_pid, 0};
+        struct osd_attr attrs[] = {
+                ATTR_DEF(OSD_APAGE_PARTITION_QUOTAS,
+                        OSD_ATTR_PQ_CAPACITY_QUOTA, sizeof(__be64)),
+                ATTR_DEF(OSD_APAGE_PARTITION_INFORMATION,
+                        OSD_ATTR_PI_USED_CAPACITY, sizeof(__be64)),
+        };
+        uint64_t capacity = ULLONG_MAX;
+        uint64_t used = ULLONG_MAX;
+        struct osd_request *or;
+        uint8_t cred_a[OSD_CAP_LEN];
+        int ret;
+
+        /* get used/capacity attributes */
+        exofs_make_credential(cred_a, &obj);
+
+        or = osd_start_request(sbi->s_dev, GFP_KERNEL);
+        if (unlikely(!or)) {
+                EXOFS_DBGMSG("exofs_statfs: osd_start_request failed.\n");
+                return -ENOMEM;
+        }
+
+        osd_req_get_attributes(or, &obj);
+        osd_req_add_get_attr_list(or, attrs, ARRAY_SIZE(attrs));
+        ret = exofs_sync_op(or, sbi->s_timeout, cred_a);
+        if (unlikely(ret))
+                goto out;
+
+        ret = extract_attr_from_req(or, &attrs[0]);
+        if (likely(!ret))
+                capacity = get_unaligned_be64(attrs[0].val_ptr);
+        else
+                EXOFS_DBGMSG("exofs_statfs: get capacity failed.\n");
+
+        ret = extract_attr_from_req(or, &attrs[1]);
+        if (likely(!ret))
+                used = get_unaligned_be64(attrs[1].val_ptr);
+        else
+                EXOFS_DBGMSG("exofs_statfs: get used-space failed.\n");
+
+        /* fill in the stats buffer */
+        buf->f_type = EXOFS_SUPER_MAGIC;
+        buf->f_bsize = EXOFS_BLKSIZE;
+        buf->f_blocks = (capacity >> EXOFS_BLKSHIFT);
+        buf->f_bfree = ((capacity - used) >> EXOFS_BLKSHIFT);
+        buf->f_bavail = buf->f_bfree;
+        buf->f_files = sbi->s_numfiles;
+        buf->f_ffree = EXOFS_MAX_ID - sbi->s_numfiles;
+        buf->f_namelen = EXOFS_NAME_LEN;
+
+out:
+        osd_end_request(or);
+        return ret;
+}
+
+static const struct super_operations exofs_sops = {
+        .alloc_inode    = exofs_alloc_inode,
+        .destroy_inode  = exofs_destroy_inode,
+        .write_inode    = exofs_write_inode,
+        .delete_inode   = exofs_delete_inode,
+        .put_super      = exofs_put_super,
+        .write_super    = exofs_write_super,
+        .statfs         = exofs_statfs,
+};
+
+/******************************************************************************
+ * INSMOD/RMMOD
+ *****************************************************************************/
+
+/*
+ * struct that describes this file system
+ */
+static struct file_system_type exofs_type = {
+        .owner          = THIS_MODULE,
+        .name           = "exofs",
+        .get_sb         = exofs_get_sb,
+        .kill_sb        = generic_shutdown_super,
+};
+
+static int __init init_exofs(void)
+{
+        int err;
+
+        err = init_inodecache();
+        if (err)
+                goto out;
+
+        err = register_filesystem(&exofs_type);
+        if (err)
+                goto out_d;
+
+        return 0;
+out_d:
+        destroy_inodecache();
+out:
+        return err;
+}
+
+static void __exit exit_exofs(void)
+{
+        unregister_filesystem(&exofs_type);
+        destroy_inodecache();
+}
+
+MODULE_AUTHOR("Avishay Traeger <avishay@gmail.com>");
+MODULE_DESCRIPTION("exofs");
+MODULE_LICENSE("GPL");
+
+module_init(init_exofs)
+module_exit(exit_exofs)