static struct inode *
nilfs_nfs_get_inode(struct super_block *sb, u64 ino, u32 generation)
{
struct inode *inode;
if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO &&
ino != NILFS_SKETCH_INO)
return ERR_PTR(-ESTALE);
#if NEED_READ_INODE
inode = iget(sb, ino);
if (!inode)
return ERR_PTR(-ENOMEM);
if (is_bad_inode(inode)) {
iput(inode);
return ERR_PTR(-ESTALE);
}
#else
inode = nilfs_iget(sb, ino);
if (IS_ERR(inode))
return ERR_CAST(inode);
#endif
if (generation && inode->i_generation != generation) {
iput(inode);
return ERR_PTR(-ESTALE);
}
return inode;
}
static int recover_dsync_blocks(struct nilfs_sb_info *sbi,
struct list_head *head,
unsigned long *nr_salvaged_blocks)
{
struct inode *inode;
struct nilfs_recovery_block *rb, *n;
unsigned blocksize = sbi->s_super->s_blocksize;
struct page *page;
loff_t pos;
int err = 0, err2 = 0;
list_for_each_entry_safe(rb, n, head, list) {
inode = nilfs_iget(sbi->s_super, rb->ino);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
inode = NULL;
goto failed_inode;
}
pos = rb->blkoff << inode->i_blkbits;
page = NULL;
err = block_write_begin(NULL, inode->i_mapping, pos, blocksize,
0, &page, NULL, nilfs_get_block);
if (unlikely(err))
goto failed_inode;
err = nilfs_recovery_copy_block(sbi, rb, page);
if (unlikely(err))
goto failed_page;
err = nilfs_set_file_dirty(sbi, inode, 1);
if (unlikely(err))
goto failed_page;
block_write_end(NULL, inode->i_mapping, pos, blocksize,
blocksize, page, NULL);
unlock_page(page);
page_cache_release(page);
(*nr_salvaged_blocks)++;
goto next;
failed_page:
unlock_page(page);
page_cache_release(page);
failed_inode:
printk(KERN_WARNING
"NILFS warning: error recovering data block "
"(err=%d, ino=%lu, block-offset=%llu)\n",
err, rb->ino, (unsigned long long)rb->blkoff);
if (!err2)
err2 = err;
next:
iput(inode); /* iput(NULL) is just ignored */
list_del_init(&rb->list);
kfree(rb);
}
static struct dentry *
nilfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
{
struct inode *inode;
ino_t ino;
if (dentry->d_name.len > NILFS_NAME_LEN)
return ERR_PTR(-ENAMETOOLONG);
ino = nilfs_inode_by_name(dir, &dentry->d_name);
inode = ino ? nilfs_iget(dir->i_sb, NILFS_I(dir)->i_root, ino) : NULL;
return d_splice_alias(inode, dentry);
}
static int nilfs_get_root_dentry(struct super_block *sb,
struct nilfs_root *root,
struct dentry **root_dentry)
{
struct inode *inode;
struct dentry *dentry;
int ret = 0;
inode = nilfs_iget(sb, root, NILFS_ROOT_INO);
if (IS_ERR(inode)) {
printk(KERN_ERR "NILFS: get root inode failed\n");
ret = PTR_ERR(inode);
goto out;
}
if (!S_ISDIR(inode->i_mode) || !inode->i_blocks || !inode->i_size) {
iput(inode);
printk(KERN_ERR "NILFS: corrupt root inode.\n");
ret = -EINVAL;
goto out;
}
if (root->cno == NILFS_CPTREE_CURRENT_CNO) {
dentry = d_find_alias(inode);
if (!dentry) {
dentry = d_alloc_root(inode);
if (!dentry) {
iput(inode);
ret = -ENOMEM;
goto failed_dentry;
}
} else {
iput(inode);
}
} else {
dentry = d_obtain_alias(inode);
if (IS_ERR(dentry)) {
ret = PTR_ERR(dentry);
goto failed_dentry;
}
}
*root_dentry = dentry;
out:
return ret;
failed_dentry:
printk(KERN_ERR "NILFS: get root dentry failed\n");
goto out;
}
static int nilfs_get_root_dentry(struct super_block *sb,
struct nilfs_root *root,
struct dentry **root_dentry)
{
struct inode *inode;
struct dentry *dentry;
int ret = 0;
inode = nilfs_iget(sb, root, NILFS_ROOT_INO);
if (IS_ERR(inode)) {
ret = PTR_ERR(inode);
nilfs_msg(sb, KERN_ERR, "error %d getting root inode", ret);
goto out;
}
if (!S_ISDIR(inode->i_mode) || !inode->i_blocks || !inode->i_size) {
iput(inode);
nilfs_msg(sb, KERN_ERR, "corrupt root inode");
ret = -EINVAL;
goto out;
}
if (root->cno == NILFS_CPTREE_CURRENT_CNO) {
dentry = d_find_alias(inode);
if (!dentry) {
dentry = d_make_root(inode);
if (!dentry) {
ret = -ENOMEM;
goto failed_dentry;
}
} else {
iput(inode);
}
} else {
dentry = d_obtain_root(inode);
if (IS_ERR(dentry)) {
ret = PTR_ERR(dentry);
goto failed_dentry;
}
}
*root_dentry = dentry;
out:
return ret;
failed_dentry:
nilfs_msg(sb, KERN_ERR, "error %d getting root dentry", ret);
goto out;
}
struct dentry *nilfs_get_parent(struct dentry *child)
{
unsigned long ino;
struct inode *inode;
struct dentry dotdot;
dotdot.d_name.name = "..";
dotdot.d_name.len = 2;
ino = nilfs_inode_by_name(child->d_inode, &dotdot);
if (!ino)
return ERR_PTR(-ENOENT);
inode = nilfs_iget(child->d_inode->i_sb, ino);
if (IS_ERR(inode))
return ERR_CAST(inode);
return d_obtain_alias(inode);
}
static struct dentry *
nilfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
{
struct inode *inode;
ino_t ino;
if (dentry->d_name.len > NILFS_NAME_LEN)
return ERR_PTR(-ENAMETOOLONG);
ino = nilfs_inode_by_name(dir, dentry);
inode = NULL;
if (ino) {
inode = nilfs_iget(dir->i_sb, ino);
if (IS_ERR(inode))
return ERR_CAST(inode);
}
return d_splice_alias(inode, dentry);
}
/*
* Export operations
*/
static struct dentry *nilfs_get_parent(struct dentry *child)
{
unsigned long ino;
struct inode *inode;
struct qstr dotdot = QSTR_INIT("..", 2);
struct nilfs_root *root;
ino = nilfs_inode_by_name(d_inode(child), &dotdot);
if (!ino)
return ERR_PTR(-ENOENT);
root = NILFS_I(d_inode(child))->i_root;
inode = nilfs_iget(child->d_sb, root, ino);
if (IS_ERR(inode))
return ERR_CAST(inode);
return d_obtain_alias(inode);
}
static struct inode *
nilfs_nfs_get_inode(struct super_block *sb, u64 ino, u32 generation)
{
struct inode *inode;
if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO &&
ino != NILFS_SKETCH_INO)
return ERR_PTR(-ESTALE);
inode = nilfs_iget(sb, ino);
if (IS_ERR(inode))
return ERR_CAST(inode);
if (generation && inode->i_generation != generation) {
iput(inode);
return ERR_PTR(-ESTALE);
}
return inode;
}
static struct dentry *nilfs_get_dentry(struct super_block *sb, u64 cno,
u64 ino, u32 gen)
{
struct nilfs_root *root;
struct inode *inode;
if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO)
return ERR_PTR(-ESTALE);
root = nilfs_lookup_root(sb->s_fs_info, cno);
if (!root)
return ERR_PTR(-ESTALE);
inode = nilfs_iget(sb, root, ino);
nilfs_put_root(root);
if (IS_ERR(inode))
return ERR_CAST(inode);
if (gen && inode->i_generation != gen) {
iput(inode);
return ERR_PTR(-ESTALE);
}
return d_obtain_alias(inode);
}
/*
* Export operations
*/
static struct dentry *nilfs_get_parent(struct dentry *child)
{
unsigned long ino;
struct inode *inode;
struct qstr dotdot = {.name = "..", .len = 2};
struct nilfs_root *root;
ino = nilfs_inode_by_name(child->d_inode, &dotdot);
if (!ino)
return ERR_PTR(-ENOENT);
root = NILFS_I(child->d_inode)->i_root;
inode = nilfs_iget(child->d_inode->i_sb, root, ino);
if (IS_ERR(inode))
return ERR_CAST(inode);
return d_obtain_alias(inode);
}
static struct dentry *nilfs_get_dentry(struct super_block *sb, u64 cno,
u64 ino, u32 gen)
{
struct nilfs_root *root;
struct inode *inode;
if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO)
return ERR_PTR(-ESTALE);
root = nilfs_lookup_root(sb->s_fs_info, cno);
if (!root)
return ERR_PTR(-ESTALE);
inode = nilfs_iget(sb, root, ino);
nilfs_put_root(root);
if (IS_ERR(inode))
return ERR_CAST(inode);
if (gen && inode->i_generation != gen) {
iput(inode);
return ERR_PTR(-ESTALE);
}
return d_obtain_alias(inode);
}
static struct dentry *nilfs_fh_to_dentry(struct super_block *sb, struct fid *fh,
int fh_len, int fh_type)
{
struct nilfs_fid *fid = (struct nilfs_fid *)fh;
if ((fh_len != NILFS_FID_SIZE_NON_CONNECTABLE &&
fh_len != NILFS_FID_SIZE_CONNECTABLE) ||
(fh_type != FILEID_NILFS_WITH_PARENT &&
fh_type != FILEID_NILFS_WITHOUT_PARENT))
return NULL;
return nilfs_get_dentry(sb, fid->cno, fid->ino, fid->gen);
}
static struct dentry *nilfs_fh_to_parent(struct super_block *sb, struct fid *fh,
int fh_len, int fh_type)
{
struct nilfs_fid *fid = (struct nilfs_fid *)fh;
if (fh_len != NILFS_FID_SIZE_CONNECTABLE ||
fh_type != FILEID_NILFS_WITH_PARENT)
return NULL;
return nilfs_get_dentry(sb, fid->cno, fid->parent_ino, fid->parent_gen);
}
static int nilfs_encode_fh(struct dentry *dentry, __u32 *fh, int *lenp,
int connectable)
{
struct nilfs_fid *fid = (struct nilfs_fid *)fh;
struct inode *inode = dentry->d_inode;
struct nilfs_root *root = NILFS_I(inode)->i_root;
int type;
if (*lenp < NILFS_FID_SIZE_NON_CONNECTABLE ||
(connectable && *lenp < NILFS_FID_SIZE_CONNECTABLE))
return 255;
fid->cno = root->cno;
fid->ino = inode->i_ino;
fid->gen = inode->i_generation;
if (connectable && !S_ISDIR(inode->i_mode)) {
struct inode *parent;
spin_lock(&dentry->d_lock);
parent = dentry->d_parent->d_inode;
fid->parent_ino = parent->i_ino;
fid->parent_gen = parent->i_generation;
spin_unlock(&dentry->d_lock);
type = FILEID_NILFS_WITH_PARENT;
*lenp = NILFS_FID_SIZE_CONNECTABLE;
} else {
type = FILEID_NILFS_WITHOUT_PARENT;
*lenp = NILFS_FID_SIZE_NON_CONNECTABLE;
}
return type;
}
const struct inode_operations nilfs_dir_inode_operations = {
.create = nilfs_create,
.lookup = nilfs_lookup,
.link = nilfs_link,
.unlink = nilfs_unlink,
.symlink = nilfs_symlink,
.mkdir = nilfs_mkdir,
.rmdir = nilfs_rmdir,
.mknod = nilfs_mknod,
.rename = nilfs_rename,
.setattr = nilfs_setattr,
.permission = nilfs_permission,
.fiemap = nilfs_fiemap,
};
const struct inode_operations nilfs_special_inode_operations = {
.setattr = nilfs_setattr,
.permission = nilfs_permission,
};
const struct inode_operations nilfs_symlink_inode_operations = {
.readlink = generic_readlink,
.follow_link = page_follow_link_light,
.put_link = page_put_link,
.permission = nilfs_permission,
};
const struct export_operations nilfs_export_ops = {
.encode_fh = nilfs_encode_fh,
.fh_to_dentry = nilfs_fh_to_dentry,
.fh_to_parent = nilfs_fh_to_parent,
.get_parent = nilfs_get_parent,
};
static int nilfs_recover_dsync_blocks(struct the_nilfs *nilfs,
struct super_block *sb,
struct nilfs_root *root,
struct list_head *head,
unsigned long *nr_salvaged_blocks)
{
struct inode *inode;
struct nilfs_recovery_block *rb, *n;
unsigned int blocksize = nilfs->ns_blocksize;
struct page *page;
loff_t pos;
int err = 0, err2 = 0;
list_for_each_entry_safe(rb, n, head, list) {
inode = nilfs_iget(sb, root, rb->ino);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
inode = NULL;
goto failed_inode;
}
pos = rb->blkoff << inode->i_blkbits;
err = block_write_begin(inode->i_mapping, pos, blocksize,
0, &page, nilfs_get_block);
if (unlikely(err)) {
loff_t isize = inode->i_size;
if (pos + blocksize > isize)
nilfs_write_failed(inode->i_mapping,
pos + blocksize);
goto failed_inode;
}
err = nilfs_recovery_copy_block(nilfs, rb, page);
if (unlikely(err))
goto failed_page;
err = nilfs_set_file_dirty(inode, 1);
if (unlikely(err))
goto failed_page;
block_write_end(NULL, inode->i_mapping, pos, blocksize,
blocksize, page, NULL);
unlock_page(page);
put_page(page);
(*nr_salvaged_blocks)++;
goto next;
failed_page:
unlock_page(page);
put_page(page);
failed_inode:
nilfs_msg(sb, KERN_WARNING,
"error %d recovering data block (ino=%lu, block-offset=%llu)",
err, (unsigned long)rb->ino,
(unsigned long long)rb->blkoff);
if (!err2)
err2 = err;
next:
iput(inode); /* iput(NULL) is just ignored */
list_del_init(&rb->list);
kfree(rb);
}
/**
* nilfs_fill_super() - initialize a super block instance
* @sb: super_block
* @data: mount options
* @silent: silent mode flag
* @nilfs: the_nilfs struct
*
* This function is called exclusively by nilfs->ns_mount_mutex.
* So, the recovery process is protected from other simultaneous mounts.
*/
static int
nilfs_fill_super(struct super_block *sb, void *data, int silent,
struct the_nilfs *nilfs)
{
struct nilfs_sb_info *sbi;
struct inode *root;
__u64 cno;
int err;
sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
if (!sbi)
return -ENOMEM;
sb->s_fs_info = sbi;
get_nilfs(nilfs);
sbi->s_nilfs = nilfs;
sbi->s_super = sb;
atomic_set(&sbi->s_count, 1);
err = init_nilfs(nilfs, sbi, (char *)data);
if (err)
goto failed_sbi;
spin_lock_init(&sbi->s_inode_lock);
INIT_LIST_HEAD(&sbi->s_dirty_files);
INIT_LIST_HEAD(&sbi->s_list);
/*
* Following initialization is overlapped because
* nilfs_sb_info structure has been cleared at the beginning.
* But we reserve them to keep our interest and make ready
* for the future change.
*/
get_random_bytes(&sbi->s_next_generation,
sizeof(sbi->s_next_generation));
spin_lock_init(&sbi->s_next_gen_lock);
sb->s_op = &nilfs_sops;
sb->s_export_op = &nilfs_export_ops;
sb->s_root = NULL;
sb->s_time_gran = 1;
sb->s_bdi = nilfs->ns_bdi;
err = load_nilfs(nilfs, sbi);
if (err)
goto failed_sbi;
cno = nilfs_last_cno(nilfs);
if (sb->s_flags & MS_RDONLY) {
if (nilfs_test_opt(sbi, SNAPSHOT)) {
down_read(&nilfs->ns_segctor_sem);
err = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile,
sbi->s_snapshot_cno);
up_read(&nilfs->ns_segctor_sem);
if (err < 0) {
if (err == -ENOENT)
err = -EINVAL;
goto failed_sbi;
}
if (!err) {
printk(KERN_ERR
"NILFS: The specified checkpoint is "
"not a snapshot "
"(checkpoint number=%llu).\n",
(unsigned long long)sbi->s_snapshot_cno);
err = -EINVAL;
goto failed_sbi;
}
cno = sbi->s_snapshot_cno;
}
}
err = nilfs_attach_checkpoint(sbi, cno);
if (err) {
printk(KERN_ERR "NILFS: error loading a checkpoint"
" (checkpoint number=%llu).\n", (unsigned long long)cno);
goto failed_sbi;
}
if (!(sb->s_flags & MS_RDONLY)) {
err = nilfs_attach_segment_constructor(sbi);
if (err)
goto failed_checkpoint;
}
root = nilfs_iget(sb, NILFS_ROOT_INO);
if (IS_ERR(root)) {
printk(KERN_ERR "NILFS: get root inode failed\n");
err = PTR_ERR(root);
goto failed_segctor;
}
if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
iput(root);
printk(KERN_ERR "NILFS: corrupt root inode.\n");
err = -EINVAL;
goto failed_segctor;
}
sb->s_root = d_alloc_root(root);
if (!sb->s_root) {
iput(root);
printk(KERN_ERR "NILFS: get root dentry failed\n");
err = -ENOMEM;
goto failed_segctor;
}
if (!(sb->s_flags & MS_RDONLY)) {
down_write(&nilfs->ns_sem);
nilfs_setup_super(sbi);
up_write(&nilfs->ns_sem);
}
down_write(&nilfs->ns_super_sem);
if (!nilfs_test_opt(sbi, SNAPSHOT))
nilfs->ns_current = sbi;
up_write(&nilfs->ns_super_sem);
return 0;
failed_segctor:
nilfs_detach_segment_constructor(sbi);
failed_checkpoint:
nilfs_detach_checkpoint(sbi);
failed_sbi:
put_nilfs(nilfs);
sb->s_fs_info = NULL;
nilfs_put_sbinfo(sbi);
return err;
}
