[PATCH 6/9] exofs: super_operations and file_system_type

Boaz Harrosh
2008-12-16T15:31:51Z

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