nilfs2: make snapshots in checkpoint tree exportable
The previous export operations cannot handle multiple versions of a filesystem if they belong to the same sb instance. This adds a new type of file handle and extends export operations so that they can get the inode specified by a checkpoint number as well as an inode number and a generation number. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
This commit is contained in:
Ryusuke Konishi
parent
4d8d9293dc
commit
8e656fd518
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@ -0,0 +1,17 @@
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#ifndef NILFS_EXPORT_H
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#define NILFS_EXPORT_H
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#include <linux/exportfs.h>
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extern const struct export_operations nilfs_export_ops;
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struct nilfs_fid {
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u64 cno;
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u64 ino;
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u32 gen;
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u32 parent_gen;
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u64 parent_ino;
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} __attribute__ ((packed));
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#endif
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@ -40,7 +40,11 @@
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#include <linux/pagemap.h>
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#include "nilfs.h"
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#include "export.h"
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#define NILFS_FID_SIZE_NON_CONNECTABLE \
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(offsetof(struct nilfs_fid, parent_gen) / 4)
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#define NILFS_FID_SIZE_CONNECTABLE (sizeof(struct nilfs_fid) / 4)
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static inline int nilfs_add_nondir(struct dentry *dentry, struct inode *inode)
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{
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@ -77,23 +81,6 @@ nilfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
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return d_splice_alias(inode, dentry);
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}
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struct dentry *nilfs_get_parent(struct dentry *child)
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{
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unsigned long ino;
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struct inode *inode;
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struct qstr dotdot = {.name = "..", .len = 2};
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ino = nilfs_inode_by_name(child->d_inode, &dotdot);
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if (!ino)
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return ERR_PTR(-ENOENT);
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inode = nilfs_iget(child->d_inode->i_sb,
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NILFS_I(child->d_inode)->i_root, ino);
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if (IS_ERR(inode))
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return ERR_CAST(inode);
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return d_obtain_alias(inode);
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}
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/*
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* By the time this is called, we already have created
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* the directory cache entry for the new file, but it
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@ -469,6 +456,115 @@ out:
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return err;
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}
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/*
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* Export operations
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*/
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static struct dentry *nilfs_get_parent(struct dentry *child)
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{
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unsigned long ino;
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struct inode *inode;
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struct qstr dotdot = {.name = "..", .len = 2};
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struct nilfs_root *root;
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ino = nilfs_inode_by_name(child->d_inode, &dotdot);
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if (!ino)
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return ERR_PTR(-ENOENT);
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root = NILFS_I(child->d_inode)->i_root;
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inode = nilfs_iget(child->d_inode->i_sb, root, ino);
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if (IS_ERR(inode))
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return ERR_CAST(inode);
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return d_obtain_alias(inode);
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}
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static struct dentry *nilfs_get_dentry(struct super_block *sb, u64 cno,
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u64 ino, u32 gen)
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{
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struct nilfs_root *root;
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struct inode *inode;
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if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO)
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return ERR_PTR(-ESTALE);
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root = nilfs_lookup_root(NILFS_SB(sb)->s_nilfs, cno);
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if (!root)
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return ERR_PTR(-ESTALE);
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inode = nilfs_iget(sb, root, ino);
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nilfs_put_root(root);
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if (IS_ERR(inode))
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return ERR_CAST(inode);
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if (gen && inode->i_generation != gen) {
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iput(inode);
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return ERR_PTR(-ESTALE);
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}
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return d_obtain_alias(inode);
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}
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static struct dentry *nilfs_fh_to_dentry(struct super_block *sb, struct fid *fh,
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int fh_len, int fh_type)
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{
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struct nilfs_fid *fid = (struct nilfs_fid *)fh;
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if ((fh_len != NILFS_FID_SIZE_NON_CONNECTABLE &&
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fh_len != NILFS_FID_SIZE_CONNECTABLE) ||
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(fh_type != FILEID_NILFS_WITH_PARENT &&
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fh_type != FILEID_NILFS_WITHOUT_PARENT))
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return NULL;
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return nilfs_get_dentry(sb, fid->cno, fid->ino, fid->gen);
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}
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static struct dentry *nilfs_fh_to_parent(struct super_block *sb, struct fid *fh,
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int fh_len, int fh_type)
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{
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struct nilfs_fid *fid = (struct nilfs_fid *)fh;
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if (fh_len != NILFS_FID_SIZE_CONNECTABLE ||
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fh_type != FILEID_NILFS_WITH_PARENT)
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return NULL;
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return nilfs_get_dentry(sb, fid->cno, fid->parent_ino, fid->parent_gen);
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}
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static int nilfs_encode_fh(struct dentry *dentry, __u32 *fh, int *lenp,
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int connectable)
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{
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struct nilfs_fid *fid = (struct nilfs_fid *)fh;
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struct inode *inode = dentry->d_inode;
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struct nilfs_root *root = NILFS_I(inode)->i_root;
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int type;
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if (*lenp < NILFS_FID_SIZE_NON_CONNECTABLE ||
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(connectable && *lenp < NILFS_FID_SIZE_CONNECTABLE))
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return 255;
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fid->cno = root->cno;
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fid->ino = inode->i_ino;
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fid->gen = inode->i_generation;
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if (connectable && !S_ISDIR(inode->i_mode)) {
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struct inode *parent;
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spin_lock(&dentry->d_lock);
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parent = dentry->d_parent->d_inode;
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fid->parent_ino = parent->i_ino;
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fid->parent_gen = parent->i_generation;
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spin_unlock(&dentry->d_lock);
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type = FILEID_NILFS_WITH_PARENT;
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*lenp = NILFS_FID_SIZE_CONNECTABLE;
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} else {
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type = FILEID_NILFS_WITHOUT_PARENT;
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*lenp = NILFS_FID_SIZE_NON_CONNECTABLE;
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}
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return type;
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}
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const struct inode_operations nilfs_dir_inode_operations = {
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.create = nilfs_create,
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.lookup = nilfs_lookup,
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@ -493,3 +589,10 @@ const struct inode_operations nilfs_symlink_inode_operations = {
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.follow_link = page_follow_link_light,
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.put_link = page_put_link,
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};
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const struct export_operations nilfs_export_ops = {
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.encode_fh = nilfs_encode_fh,
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.fh_to_dentry = nilfs_fh_to_dentry,
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.fh_to_parent = nilfs_fh_to_parent,
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.get_parent = nilfs_get_parent,
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};
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@ -264,9 +264,6 @@ extern int nilfs_set_file_dirty(struct nilfs_sb_info *, struct inode *,
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extern int nilfs_mark_inode_dirty(struct inode *);
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extern void nilfs_dirty_inode(struct inode *);
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/* namei.c */
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extern struct dentry *nilfs_get_parent(struct dentry *);
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/* super.c */
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extern struct inode *nilfs_alloc_inode_common(struct the_nilfs *);
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extern struct inode *nilfs_alloc_inode(struct super_block *);
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@ -48,10 +48,10 @@
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#include <linux/vfs.h>
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#include <linux/writeback.h>
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#include <linux/kobject.h>
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#include <linux/exportfs.h>
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#include <linux/seq_file.h>
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#include <linux/mount.h>
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#include "nilfs.h"
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#include "export.h"
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#include "mdt.h"
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#include "alloc.h"
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#include "btree.h"
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@ -556,56 +556,6 @@ static const struct super_operations nilfs_sops = {
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.show_options = nilfs_show_options
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};
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static struct inode *
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nilfs_nfs_get_inode(struct super_block *sb, u64 ino, u32 generation)
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{
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struct inode *inode;
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struct nilfs_root *root;
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if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO &&
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ino != NILFS_SKETCH_INO)
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return ERR_PTR(-ESTALE);
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root = nilfs_lookup_root(NILFS_SB(sb)->s_nilfs,
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NILFS_CPTREE_CURRENT_CNO);
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if (!root)
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return ERR_PTR(-ESTALE);
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/* new file handle type is required to export snapshots */
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inode = nilfs_iget(sb, root, ino);
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nilfs_put_root(root);
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if (IS_ERR(inode))
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return ERR_CAST(inode);
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if (generation && inode->i_generation != generation) {
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iput(inode);
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return ERR_PTR(-ESTALE);
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}
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return inode;
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}
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static struct dentry *
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nilfs_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len,
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int fh_type)
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{
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return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
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nilfs_nfs_get_inode);
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}
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static struct dentry *
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nilfs_fh_to_parent(struct super_block *sb, struct fid *fid, int fh_len,
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int fh_type)
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{
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return generic_fh_to_parent(sb, fid, fh_len, fh_type,
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nilfs_nfs_get_inode);
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}
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static const struct export_operations nilfs_export_ops = {
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.fh_to_dentry = nilfs_fh_to_dentry,
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.fh_to_parent = nilfs_fh_to_parent,
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.get_parent = nilfs_get_parent,
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};
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enum {
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Opt_err_cont, Opt_err_panic, Opt_err_ro,
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Opt_barrier, Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery,
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@ -67,6 +67,19 @@ enum fid_type {
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* 32 bit parent block number, 32 bit parent generation number
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*/
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FILEID_UDF_WITH_PARENT = 0x52,
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/*
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* 64 bit checkpoint number, 64 bit inode number,
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* 32 bit generation number.
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*/
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FILEID_NILFS_WITHOUT_PARENT = 0x61,
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/*
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* 64 bit checkpoint number, 64 bit inode number,
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* 32 bit generation number, 32 bit parent generation.
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* 64 bit parent inode number.
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*/
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FILEID_NILFS_WITH_PARENT = 0x62,
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};
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struct fid {
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