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    Subject[PATCH 6/9] 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>
    ---
    fs/exofs/Kbuild | 2 +-
    fs/exofs/exofs.h | 30 ++++
    fs/exofs/inode.c | 195 +++++++++++++++++++++-
    fs/exofs/super.c | 502 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
    4 files changed, 727 insertions(+), 2 deletions(-)
    create mode 100644 fs/exofs/super.c

    diff --git a/fs/exofs/Kbuild b/fs/exofs/Kbuild
    index 27c738c..e293cb9 100644
    --- a/fs/exofs/Kbuild
    +++ b/fs/exofs/Kbuild
    @@ -26,5 +26,5 @@ KBUILD_CPPFLAGS := -I$(OSD_INC) $(KBUILD_CPPFLAGS)

    endif

    -exofs-objs := osd.o inode.o file.o symlink.o namei.o dir.o
    +exofs-objs := osd.o inode.o file.o symlink.o namei.o dir.o super.o
    obj-$(CONFIG_EXOFS_FS) += exofs.o
    diff --git a/fs/exofs/exofs.h b/fs/exofs/exofs.h
    index 7330b59..75c608d 100644
    --- a/fs/exofs/exofs.h
    +++ b/fs/exofs/exofs.h
    @@ -52,6 +52,17 @@
    #define _LLU(x) (unsigned long long)(x)

    /*
    + * struct to hold what we get from mount options
    + */
    +struct exofs_mountopt {
    + const char *dev_name;
    + uint64_t pid;
    + int timeout;
    + bool mkfs;
    + int format; /*in Mbyte*/
    +};
    +
    +/*
    * our extension to the in-memory superblock
    */
    struct exofs_sb_info {
    @@ -110,6 +121,14 @@ static inline struct exofs_i_info *EXOFS_I(struct inode *inode)
    }

    /*
    + * ugly struct so that we can pass two arguments to update_inode's callback
    + */
    +struct updatei_args {
    + struct exofs_sb_info *sbi;
    + struct exofs_fcb *fcb;
    +};
    +
    +/*
    * Maximum count of links to a file
    */
    #define EXOFS_LINK_MAX 32000
    @@ -188,12 +207,20 @@ void free_osd_req(struct osd_request *req);
    /* inode.c */
    void exofs_truncate(struct inode *inode);
    extern struct inode *exofs_iget(struct super_block *, unsigned long);
    +extern int exofs_write_inode(struct inode *, int);
    +extern void exofs_delete_inode(struct inode *);
    struct inode *exofs_new_inode(struct inode *, int);
    int exofs_setattr(struct dentry *, struct iattr *);
    int exofs_write_begin(struct file *file, struct address_space *mapping,
    loff_t pos, unsigned len, unsigned flags,
    struct page **pagep, void **fsdata);

    +/* super.c: */
    +#ifdef EXOFS_DEBUG
    +void exofs_dprint_internal(char *str, ...);
    +#endif
    +extern void exofs_write_super(struct super_block *);
    +
    /* dir.c: */
    int exofs_add_link(struct dentry *, struct inode *);
    ino_t exofs_inode_by_name(struct inode *, struct dentry *);
    @@ -223,6 +250,9 @@ extern struct address_space_operations exofs_aops;
    extern struct inode_operations exofs_dir_inode_operations;
    extern struct inode_operations exofs_special_inode_operations;

    +/* super.c */
    +extern struct super_operations exofs_sops;
    +
    /* symlink.c */
    extern struct inode_operations exofs_symlink_inode_operations;
    extern struct inode_operations exofs_fast_symlink_inode_operations;
    diff --git a/fs/exofs/inode.c b/fs/exofs/inode.c
    index 25a562e..e24690b 100644
    --- a/fs/exofs/inode.c
    +++ b/fs/exofs/inode.c
    @@ -37,6 +37,7 @@
    #include "exofs.h"

    static int __readpage_filler(struct page *page, bool is_async_unlock);
    +static int exofs_update_inode(struct inode *inode, int do_sync);

    /*
    * Test whether an inode is a fast symlink.
    @@ -49,6 +50,18 @@ static inline int exofs_inode_is_fast_symlink(struct inode *inode)
    }

    /*
    + * Callback function from exofs_delete_inode() - don't have much cleaning up to
    + * do.
    + */
    +void delete_done(struct osd_request *req, void *p)
    +{
    + struct exofs_sb_info *sbi;
    + free_osd_req(req);
    + sbi = (struct exofs_sb_info *)p;
    + atomic_dec(&sbi->s_curr_pending);
    +}
    +
    +/*
    * get_block_t - Fill in a buffer_head
    * An OSD takes care of block allocation so we just fake an allocation by
    * putting in the inode's sector_t in the buffer_head.
    @@ -94,6 +107,62 @@ int exofs_write_begin_export(struct file *file, struct address_space *mapping,
    }

    /*
    + * Called when the refcount of an inode reaches zero. We remove the object
    + * from the OSD here. We make sure the object was created before we try and
    + * delete it.
    + */
    +void exofs_delete_inode(struct inode *inode)
    +{
    + struct exofs_i_info *oi = EXOFS_I(inode);
    + struct osd_request *req = NULL;
    + struct super_block *sb = inode->i_sb;
    + struct exofs_sb_info *sbi = sb->s_fs_info;
    + int ret;
    +
    + truncate_inode_pages(&inode->i_data, 0);
    +
    + if (is_bad_inode(inode))
    + goto no_delete;
    + mark_inode_dirty(inode);
    + exofs_update_inode(inode, inode_needs_sync(inode));
    +
    + inode->i_size = 0;
    + if (inode->i_blocks)
    + exofs_truncate(inode);
    +
    + clear_inode(inode);
    +
    + req = prepare_osd_remove(sbi->s_dev, sbi->s_pid,
    + inode->i_ino + EXOFS_OBJ_OFF);
    + if (!req) {
    + printk(KERN_ERR "ERROR: prepare_osd_remove failed\n");
    + return;
    + }
    +
    + /* if we are deleting an obj that hasn't been created yet, wait */
    + if (!ObjCreated(oi)) {
    + if (!Obj2BCreated(oi))
    + BUG();
    + else
    + wait_event(oi->i_wq, ObjCreated(oi));
    + }
    +
    + ret = exofs_async_op(req, delete_done, sbi, oi->i_cred);
    + if (ret) {
    + printk(KERN_ERR
    + "ERROR: @exofs_delete_inode exofs_async_op failed\n");
    + free_osd_req(req);
    + return;
    + }
    + atomic_inc(&sbi->s_curr_pending);
    +
    + return;
    +
    +no_delete:
    + clear_inode(inode);
    +}
    +
    +/*
    * Callback function when writepage finishes. Check for errors, unlock, clean
    * up, etc.
    */
    @@ -610,6 +679,131 @@ bad_inode:
    }

    /*
    + * Callback function from exofs_update_inode().
    + */
    +void updatei_done(struct osd_request *req, void *p)
    +{
    + struct updatei_args *args = (struct updatei_args *)p;
    +
    + free_osd_req(req);
    +
    + atomic_dec(&args->sbi->s_curr_pending);
    +
    + kfree(args->fcb);
    + kfree(args);
    + args = NULL;
    +}
    +
    +/*
    + * Write the inode to the OSD. Just fill up the struct, and set the attribute
    + * synchronously or asynchronously depending on the do_sync flag.
    + */
    +static int exofs_update_inode(struct inode *inode, int do_sync)
    +{
    + struct exofs_i_info *oi = EXOFS_I(inode);
    + struct super_block *sb = inode->i_sb;
    + struct exofs_sb_info *sbi = sb->s_fs_info;
    + struct osd_request *req = NULL;
    + struct exofs_fcb *fcb = NULL;
    + int ret;
    + int n;
    +
    + fcb = kmalloc(sizeof(struct exofs_fcb), GFP_KERNEL);
    + if (!fcb) {
    + ret = -ENOMEM;
    + goto out;
    + }
    +
    + fcb->i_mode = cpu_to_be16(inode->i_mode);
    + fcb->i_uid = cpu_to_be32(inode->i_uid);
    + fcb->i_gid = cpu_to_be32(inode->i_gid);
    + fcb->i_links_count = cpu_to_be16(inode->i_nlink);
    + fcb->i_ctime = cpu_to_be32(inode->i_ctime.tv_sec);
    + fcb->i_atime = cpu_to_be32(inode->i_atime.tv_sec);
    + fcb->i_mtime = cpu_to_be32(inode->i_mtime.tv_sec);
    + fcb->i_size = cpu_to_be64(oi->i_commit_size = i_size_read(inode));
    + fcb->i_generation = cpu_to_be32(inode->i_generation);
    +
    + if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
    + if (old_valid_dev(inode->i_rdev)) {
    + fcb->i_data[0] = old_encode_dev(inode->i_rdev);
    + fcb->i_data[1] = 0;
    + } else {
    + fcb->i_data[0] = 0;
    + fcb->i_data[1] = new_encode_dev(inode->i_rdev);
    + fcb->i_data[2] = 0;
    + }
    + } else
    + for (n = 0; n < EXOFS_IDATA; n++)
    + fcb->i_data[n] = oi->i_data[n];
    +
    + req = prepare_osd_set_attr(sbi->s_dev, sbi->s_pid,
    + (uint64_t) (inode->i_ino + EXOFS_OBJ_OFF));
    + if (!req) {
    + printk(KERN_ERR "ERROR: prepare set_attr failed.\n");
    + kfree(fcb);
    + ret = -ENOMEM;
    + goto out;
    + }
    +
    + prepare_set_attr_list_add_entry(req,
    + OSD_PAGE_NUM_IBM_UOBJ_FS_DATA,
    + OSD_ATTR_NUM_IBM_UOBJ_FS_DATA_INODE,
    + EXOFS_INO_ATTR_SIZE,
    + (unsigned char *)fcb);
    +
    + if (!ObjCreated(oi)) {
    + if (!Obj2BCreated(oi))
    + BUG();
    + else
    + wait_event(oi->i_wq, ObjCreated(oi));
    + }
    +
    + if (do_sync) {
    + ret = exofs_sync_op(req, sbi->s_timeout, oi->i_cred);
    + free_osd_req(req);
    + kfree(fcb);
    + } else {
    + struct updatei_args *args = NULL;
    +
    + args = kmalloc(sizeof(struct updatei_args), GFP_KERNEL);
    + if (!args) {
    + kfree(fcb);
    + ret = -ENOMEM;
    + goto out;
    + }
    + args->sbi = sbi;
    + args->fcb = fcb;
    +
    + ret = exofs_async_op(req, updatei_done, args, oi->i_cred);
    + if (ret) {
    + free_osd_req(req);
    + kfree(fcb);
    + kfree(args);
    + goto out;
    + }
    + atomic_inc(&sbi->s_curr_pending);
    + }
    +out:
    + return ret;
    +}
    +
    +int exofs_write_inode(struct inode *inode, int wait)
    +{
    + return exofs_update_inode(inode, wait);
    +}
    +
    +int exofs_sync_inode(struct inode *inode)
    +{
    + struct writeback_control wbc = {
    + .sync_mode = WB_SYNC_ALL,
    + .nr_to_write = 0, /* sys_fsync did this */
    + };
    +
    + return sync_inode(inode, &wbc);
    +}
    +
    +/*
    * Set inode attributes - just call generic functions.
    */
    int exofs_setattr(struct dentry *dentry, struct iattr *iattr)
    @@ -624,7 +818,6 @@ int exofs_setattr(struct dentry *dentry, struct iattr *iattr)
    error = inode_setattr(inode, iattr);
    return error;
    }
    -
    /*
    * Callback function from exofs_new_inode(). The important thing is that we
    * set the ObjCreated flag so that other methods know that the object exists on
    diff --git a/fs/exofs/super.c b/fs/exofs/super.c
    new file mode 100644
    index 0000000..8ecf700
    --- /dev/null
    +++ b/fs/exofs/super.c
    @@ -0,0 +1,502 @@
    +/*
    + * Copyright (C) 2005, 2006
    + * Avishay Traeger (avishay@gmail.com) (avishay@il.ibm.com)
    + * Copyright (C) 2005, 2006
    + * International Business Machines
    + *
    + * 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
    + *****************************************************************************/
    +
    +/*
    + * exofs-specific mount-time options.
    + */
    +enum { Opt_lun, Opt_tid, 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;
    + int s_pid = 0;
    +
    + 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;
    + if (!*p)
    + continue;
    +
    + token = match_token(p, tokens, args);
    + switch (token) {
    + case Opt_pid:
    + if (match_int(&args[0], &option))
    + return -EINVAL;
    + if (option < 65536) {
    + EXOFS_ERR("Partition ID must be >= 65536");
    + return -EINVAL;
    + }
    + opts->pid = option;
    + 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,
    + 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
    + *****************************************************************************/
    +
    +/*
    + * Write the superblock to the OSD
    + */
    +void exofs_write_super(struct super_block *sb)
    +{
    + struct exofs_sb_info *sbi;
    + struct exofs_fscb *fscb = NULL;
    + struct osd_request *req = NULL;
    +
    + fscb = kzalloc(sizeof(struct exofs_fscb), GFP_KERNEL);
    + if (!fscb)
    + return;
    +
    + lock_kernel();
    + sbi = sb->s_fs_info;
    + fscb->s_nextid = sbi->s_nextid;
    + fscb->s_magic = sb->s_magic;
    + fscb->s_numfiles = sbi->s_numfiles;
    + fscb->s_newfs = 0;
    +
    + req = prepare_osd_write(sbi->s_dev, sbi->s_pid, EXOFS_SUPER_ID,
    + sizeof(struct exofs_fscb), 0, 0,
    + (unsigned char *)(fscb));
    + if (!req) {
    + EXOFS_ERR("ERROR: write super failed.\n");
    + kfree(fscb);
    + return;
    + }
    +
    + exofs_sync_op(req, sbi->s_timeout, sbi->s_cred);
    + free_osd_req(req);
    + sb->s_dirt = 0;
    + 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 = NULL; /*extended info */
    + struct exofs_fscb fscb; /*on-disk superblock info */
    + struct osd_request *req = NULL;
    + 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;
    + atomic_set(&sbi->s_curr_pending, 0);
    + sb->s_bdev = NULL;
    + sb->s_dev = 0;
    +
    + /* read data from on-disk superblock object */
    + make_credential(sbi->s_cred, sbi->s_pid, EXOFS_SUPER_ID);
    +
    + req = prepare_osd_read(sbi->s_dev, sbi->s_pid, EXOFS_SUPER_ID,
    + sizeof(struct exofs_fscb), 0, 0,
    + (unsigned char *)(&fscb));
    + if (!req) {
    + if (!silent)
    + EXOFS_ERR("ERROR: could not prepare read request.\n");
    + ret = -ENOMEM;
    + goto free_sbi;
    + }
    +
    + ret = exofs_sync_op(req, sbi->s_timeout, sbi->s_cred);
    + if (ret != 0) {
    + if (!silent)
    + EXOFS_ERR("ERROR: read super failed.\n");
    + ret = -EIO;
    + goto free_sbi;
    + }
    +
    + sb->s_magic = fscb.s_magic;
    + sbi->s_nextid = fscb.s_nextid;
    + sbi->s_numfiles = 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 faild\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 (req)
    + free_osd_req(req);
    + 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((char *) 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;
    + uint8_t cred_a[OSD_CAP_LEN];
    + struct osd_request *req = NULL;
    + uint32_t page;
    + uint32_t attr;
    + uint16_t expected;
    + uint64_t capacity;
    + uint64_t used;
    + uint8_t *data;
    + int ret;
    +
    + /* get used/capacity attributes */
    + make_credential(cred_a, sbi->s_pid, 0);
    +
    + req = prepare_osd_get_attr(sbi->s_dev, sbi->s_pid, 0);
    + if (!req) {
    + EXOFS_ERR("ERROR: prepare get_attr failed.\n");
    + return -1;
    + }
    +
    + prepare_get_attr_list_add_entry(req,
    + OSD_APAGE_PARTITION_QUOTAS,
    + OSD_ATTR_PQ_CAPACITY_QUOTA,
    + 8);
    +
    + prepare_get_attr_list_add_entry(req,
    + OSD_APAGE_PARTITION_INFORMATION,
    + OSD_ATTR_PI_USED_CAPACITY,
    + 8);
    +
    + ret = exofs_sync_op(req, sbi->s_timeout, cred_a);
    + if (ret)
    + goto out;
    +
    + page = OSD_APAGE_PARTITION_QUOTAS;
    + attr = OSD_ATTR_PQ_CAPACITY_QUOTA;
    + expected = 8;
    + ret = extract_next_attr_from_req(req, &page, &attr, &expected, &data);
    + if (ret) {
    + EXOFS_ERR("ERROR: extract attr from req failed\n");
    + goto out;
    + }
    + capacity = be64_to_cpu(*((uint64_t *)data));
    +
    + page = OSD_APAGE_PARTITION_INFORMATION;
    + attr = OSD_ATTR_PI_USED_CAPACITY;
    + expected = 8;
    + ret = extract_next_attr_from_req(req, &page, &attr, &expected, &data);
    + if (ret) {
    + EXOFS_ERR("ERROR: extract attr from req failed\n");
    + goto out;
    + }
    + used = be64_to_cpu(*((uint64_t *)data));
    +
    + /* 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:
    + free_osd_req(req);
    +
    + return ret;
    +}
    +
    +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)
    --
    1.6.0.1



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