static struct super_block *
HgfsGetSb(struct file_system_type *fs_type,
int flags,
const char *dev_name,
void *rawData)
{
return get_sb_nodev(fs_type, flags, rawData, HgfsReadSuper);
}
static struct super_block *
FsOpGetSb(struct file_system_type *fs_type, // IN: file system type of mount
int flags, // IN: mount flags
const char *dev_name, // IN: device mounting on
void *rawData) // IN: mount arguments
{
return get_sb_nodev(fs_type, flags, rawData, FsOpReadSuper);
}
static int
zpl_get_sb(struct file_system_type *fs_type, int flags,
const char *osname, void *data, struct vfsmount *mnt)
{
zpl_mount_data_t zmd = { osname, data };
return get_sb_nodev(fs_type, flags, &zmd, zpl_fill_super, mnt);
}
static int
HgfsGetSb(struct file_system_type *fs_type,
int flags,
const char *dev_name,
void *rawData,
struct vfsmount *mnt)
{
return get_sb_nodev(fs_type, flags, rawData, HgfsReadSuper, mnt);
}
static int
FsOpGetSb(struct file_system_type *fs_type, // IN: file system type of mount
int flags, // IN: mount flags
const char *dev_name, // IN: device mounting on
void *rawData, // IN: mount arguments
struct vfsmount *mnt) // IN: vfs mount
{
return get_sb_nodev(fs_type, flags, rawData, FsOpReadSuper, mnt);
}
static int unionfs_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name,
void *raw_data, struct vfsmount *mnt)
{
int err;
err = get_sb_nodev(fs_type, flags, raw_data, unionfs_read_super, mnt);
if (!err)
UNIONFS_SB(mnt->mnt_sb)->dev_name =
kstrdup(dev_name, GFP_KERNEL);
return err;
}
/**
* lofs_get_sb
* @fs_type
* @flags
* @dev_name: The path to mount over
* @raw_data: The options passed into the kernel
*
* The whole lofs_get_sb process is broken into 3 functions:
* lofs_fill_super(): used by get_sb_nodev, fills out the super_block
* with as much information as it can before needing
* the lower filesystem.
* lofs_read_super(): this accesses the lower filesystem and uses
* lofs_interpolate to perform most of the linking
*/
static int lofs_get_sb(struct file_system_type *fs_type, int flags,
const char *dev_name, void *raw_data,
struct vfsmount *mnt)
{
int rc;
rc = get_sb_nodev(fs_type, flags, raw_data, lofs_fill_super, mnt);
if (rc < 0) {
printk(KERN_ERR "Getting sb failed; rc = [%d]\n", rc);
}
return rc;
}
static int
zpl_get_sb(struct file_system_type *fs_type, int flags,
const char *osname, void *data, struct vfsmount *mnt)
{
zfs_mntopts_t *zmo = zfs_mntopts_alloc();
int error;
error = zpl_parse_options((char *)osname, (char *)data, zmo, B_FALSE);
if (error) {
zfs_mntopts_free(zmo);
return (error);
}
return (get_sb_nodev(fs_type, flags, zmo, zpl_fill_super, mnt));
}
/******************************************************************************
*
* axfs_get_sb
*
* Description:
* After testing various mounting options and media mounts the image
*
* Parameters:
* (IN) fs_type - pointer to file_system_type
*
* (IN) flags - mount flags
*
* (IN) dev_name - block device name passed in from mount
*
* (IN) data - pointer to a string containing mount options
*
* (IN) mnt - VFS mount point
*
* Returns:
* 0 or error number
*
*****************************************************************************/
int axfs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *data, struct vfsmount *mnt)
{
char *secondary_blk_dev;
struct axfs_fill_super_info *output;
unsigned long physaddr;
unsigned long virtaddr;
int err;
err = parse_axfs_options((char *)data, &secondary_blk_dev, &physaddr, &virtaddr);
if(err != 0)
return err;
#ifdef CONFIG_SNSC_FIRST_MOUNT_AXFS_AS_ROOTFS
printk("AXFS: Checking AXFS filesystem at virtaddr: 0x%08lx "
"(physaddr=0x%08lx).\n", virtaddr, physaddr);
#endif
/* Check if physaddr is valid */
output = axfs_get_sb_physaddr(physaddr);
if(!(IS_ERR(output)))
goto out;
/* Check if virtaddr is valid */
output = axfs_get_sb_virtaddr(virtaddr);
if(!(IS_ERR(output)))
goto out;
/* Next we assume there's a MTD device */
output = axfs_get_sb_mtd(dev_name);
if(!(IS_ERR(output)))
goto out;
/* Now we assume it's a block device */
output = axfs_get_sb_block(fs_type, flags, dev_name, secondary_blk_dev);
if(!(IS_ERR(output)))
{
return get_sb_bdev(fs_type, flags, dev_name, output, axfs_fill_super, mnt);
}
return PTR_ERR(output);
out:
if(secondary_blk_dev) {
return get_sb_bdev(fs_type, flags, secondary_blk_dev, output, axfs_fill_super, mnt);
}
return get_sb_nodev(fs_type, flags, output, axfs_fill_super, mnt);
}
int samplefs_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data, struct vfsmount *mnt)
{
return get_sb_nodev(fs_type, flags, data, samplefs_fill_super, mnt);
}
struct super_block * samplefs_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data)
{
return get_sb_nodev(fs_type, flags, data, samplefs_fill_super);
}
static int dazukofs_fill_super(struct super_block *sb, void *data, int silent)
{
struct dazukofs_sb_info *sbi;
struct dentry *root;
static const struct qstr name = { .name = "/", .len = 1 };
struct dazukofs_dentry_info *di;
sbi = kmem_cache_zalloc(dazukofs_sb_info_cachep, GFP_KERNEL);
if (!sbi)
return -ENOMEM;
sb->s_op = &dazukofs_sops;
root = d_alloc(NULL, &name);
if (!root) {
kmem_cache_free(dazukofs_sb_info_cachep, sbi);
return -ENOMEM;
}
sb->s_root = root;
sb->s_root->d_op = &dazukofs_dops;
sb->s_root->d_sb = sb;
sb->s_root->d_parent = sb->s_root;
di = kmem_cache_zalloc(dazukofs_dentry_info_cachep, GFP_KERNEL);
if (!di) {
kmem_cache_free(dazukofs_sb_info_cachep, sbi);
dput(sb->s_root);
return -ENOMEM;
}
set_dentry_private(sb->s_root, di);
set_sb_private(sb, sbi);
return 0;
}
static int dazukofs_read_super(struct super_block *sb, const char *dev_name)
{
struct nameidata nd;
struct dentry *lower_root;
struct vfsmount *lower_mnt;
int err;
memset(&nd, 0, sizeof(struct nameidata));
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39)
err = kern_path(dev_name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &nd.path);
#else
err = path_lookup(dev_name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &nd);
#endif
if (err)
return err;
lower_root = dget(nd.path.dentry);
lower_mnt = mntget(nd.path.mnt);
if (IS_ERR(lower_root)) {
err = PTR_ERR(lower_root);
goto out_put;
}
if (!lower_root->d_inode) {
err = -ENOENT;
goto out_put;
}
if (!S_ISDIR(lower_root->d_inode->i_mode)) {
err = -EINVAL;
goto out_put;
}
set_lower_sb(sb, lower_root->d_sb);
sb->s_maxbytes = lower_root->d_sb->s_maxbytes;
set_lower_dentry(sb->s_root, lower_root, lower_mnt);
err = dazukofs_interpose(lower_root, sb->s_root, sb, 0);
if (err)
goto out_put;
goto out;
out_put:
dput(lower_root);
mntput(lower_mnt);
out:
path_put(&nd.path);
return err;
}
// FIXME!
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39)
static struct dentry* dazukofs_get_sb(struct file_system_type *fs_type, int flags,
const char *dev_name, void *data)
{
return mount_nodev(fs_type, flags, data, dazukofs_fill_super);
}
#else
static int dazukofs_get_sb(struct file_system_type *fs_type, int flags,
const char *dev_name, void *data,
struct vfsmount *mnt)
{
struct super_block *sb;
int err;
err = get_sb_nodev(fs_type, flags, data, dazukofs_fill_super, mnt);
if (err)
goto out;
sb = mnt->mnt_sb;
err = dazukofs_parse_mount_options(data, sb);
if (err)
goto out_abort;
err = dazukofs_read_super(sb, dev_name);
if (err)
goto out_abort;
goto out;
out_abort:
dput(sb->s_root);
up_write(&sb->s_umount);
deactivate_super(sb);
out:
return err;
}
#endif
static void init_once(void *data)
{
struct dazukofs_inode_info *inode_info =
(struct dazukofs_inode_info *)data;
memset(inode_info, 0, sizeof(struct dazukofs_inode_info));
inode_init_once(&(inode_info->vfs_inode));
}
static void destroy_caches(void)
{
if (dazukofs_inode_info_cachep) {
kmem_cache_destroy(dazukofs_inode_info_cachep);
dazukofs_inode_info_cachep = NULL;
}
if (dazukofs_sb_info_cachep) {
kmem_cache_destroy(dazukofs_sb_info_cachep);
dazukofs_sb_info_cachep = NULL;
}
if (dazukofs_dentry_info_cachep) {
kmem_cache_destroy(dazukofs_dentry_info_cachep);
dazukofs_dentry_info_cachep = NULL;
}
if (dazukofs_file_info_cachep) {
kmem_cache_destroy(dazukofs_file_info_cachep);
dazukofs_file_info_cachep = NULL;
}
}
static int init_caches(void)
{
dazukofs_inode_info_cachep =
kmem_cache_create("dazukofs_inode_info_cache",
sizeof(struct dazukofs_inode_info), 0,
SLAB_HWCACHE_ALIGN,
init_once);
if (!dazukofs_inode_info_cachep)
goto out_nomem;
dazukofs_sb_info_cachep =
kmem_cache_create("dazukofs_sb_info_cache",
sizeof(struct dazukofs_sb_info), 0,
SLAB_HWCACHE_ALIGN,
NULL);
if (!dazukofs_sb_info_cachep)
goto out_nomem;
dazukofs_dentry_info_cachep =
kmem_cache_create("dazukofs_dentry_info_cache",
sizeof(struct dazukofs_dentry_info), 0,
SLAB_HWCACHE_ALIGN,
NULL);
if (!dazukofs_dentry_info_cachep)
goto out_nomem;
dazukofs_file_info_cachep =
kmem_cache_create("dazukofs_file_info_cache",
sizeof(struct dazukofs_file_info), 0,
SLAB_HWCACHE_ALIGN,
NULL);
if (!dazukofs_file_info_cachep)
goto out_nomem;
return 0;
out_nomem:
destroy_caches();
return -ENOMEM;
}
static int rootfs_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data, struct vfsmount *mnt)
{
return get_sb_nodev(fs_type, flags|MS_NOUSER, data, ramfs_fill_super,
mnt);
}
static struct super_block *rootfs_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data)
{
return get_sb_nodev(fs_type, flags|MS_NOUSER, data, ramfs_fill_super);
}
static int fuse_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name,
void *raw_data, struct vfsmount *mnt)
{
return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super, mnt);
}
static int sf_get_sb(struct file_system_type *fs_type, int flags,
const char *dev_name, void *data, struct vfsmount *mnt)
{
TRACE();
return get_sb_nodev(fs_type, flags, data, sf_read_super_26, mnt);
}
static struct super_block *sf_get_sb(struct file_system_type *fs_type, int flags,
const char *dev_name, void *data)
{
TRACE();
return get_sb_nodev(fs_type, flags, data, sf_read_super_26);
}
static int
hostfs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *data, struct vfsmount *mnt) {
return get_sb_nodev(fs_type, flags, data, hostfs_read_super, mnt);}
static struct super_block *fuse_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name,
void *raw_data)
{
return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super);
}
static struct super_block *
hostfs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *data) {
return get_sb_nodev(fs_type, flags, data, hostfs_read_super);}
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
*/
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 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);
if (!sbi)
return -ENOMEM;
/* use mount options to fill superblock */
od = osduld_path_lookup(opts->dev_name);
if (IS_ERR(od)) {
ret = PTR_ERR(od);
goto free_sbi;
}
sbi->s_ods[0] = od;
sbi->s_numdevs = 1;
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;
obj.partition = sbi->s_pid;
obj.id = EXOFS_SUPER_ID;
exofs_make_credential(sbi->s_cred, &obj);
ret = exofs_read_kern(od, sbi->s_cred, &obj, 0, &fscb, sizeof(fscb));
if (unlikely(ret))
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;
}
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;
sb->s_export_op = &exofs_export_ops;
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;
}
_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);
exofs_free_sbi(sbi);
return ret;
}
/*
* 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 exofs_io_state *ios;
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;
uint8_t cred_a[OSD_CAP_LEN];
int ret;
ret = exofs_get_io_state(sbi, &ios);
if (ret) {
EXOFS_DBGMSG("exofs_get_io_state failed.\n");
return ret;
}
exofs_make_credential(cred_a, &ios->obj);
ios->cred = sbi->s_cred;
ios->in_attr = attrs;
ios->in_attr_len = ARRAY_SIZE(attrs);
ret = exofs_sbi_read(ios);
if (unlikely(ret))
goto out;
ret = extract_attr_from_ios(ios, &attrs[0]);
if (likely(!ret)) {
capacity = get_unaligned_be64(attrs[0].val_ptr);
if (unlikely(!capacity))
capacity = ULLONG_MAX;
} else
EXOFS_DBGMSG("exofs_statfs: get capacity failed.\n");
ret = extract_attr_from_ios(ios, &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 >> 9;
buf->f_bfree = (capacity - used) >> 9;
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:
exofs_put_io_state(ios);
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,
.sync_fs = exofs_sync_fs,
.statfs = exofs_statfs,
};
/******************************************************************************
* EXPORT OPERATIONS
*****************************************************************************/
struct dentry *exofs_get_parent(struct dentry *child)
{
unsigned long ino = exofs_parent_ino(child);
if (!ino)
return NULL;
return d_obtain_alias(exofs_iget(child->d_inode->i_sb, ino));
}