From 4d8d9293dce503eb0e083e17a02a328d397e7f00 Mon Sep 17 00:00:00 2001 From: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Date: Wed, 25 Aug 2010 17:45:44 +0900 Subject: nilfs2: set pointer to root object in inodes This puts a pointer to nilfs_root object in the private part of on-memory inode, and makes nilfs_iget function pick up the inode with the same root object. Non-root inodes inherit its nilfs_root object from parent inode. That of the root inode is allocated through nilfs_attach_checkpoint() function. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> --- fs/nilfs2/inode.c | 27 ++++++++++++++++++++++----- fs/nilfs2/namei.c | 5 +++-- fs/nilfs2/nilfs.h | 7 +++++-- fs/nilfs2/recovery.c | 12 ++++++++---- fs/nilfs2/super.c | 37 ++++++++++++++++++++++++++++++------- 5 files changed, 68 insertions(+), 20 deletions(-) (limited to 'fs/nilfs2') diff --git a/fs/nilfs2/inode.c b/fs/nilfs2/inode.c index 82cfdbc..7306fc7 100644 --- a/fs/nilfs2/inode.c +++ b/fs/nilfs2/inode.c @@ -37,6 +37,7 @@ struct nilfs_iget_args { u64 ino; __u64 cno; + struct nilfs_root *root; int for_gc; }; @@ -284,6 +285,7 @@ struct inode *nilfs_new_inode(struct inode *dir, int mode) struct nilfs_sb_info *sbi = NILFS_SB(sb); struct inode *inode; struct nilfs_inode_info *ii; + struct nilfs_root *root; int err = -ENOMEM; ino_t ino; @@ -294,8 +296,10 @@ struct inode *nilfs_new_inode(struct inode *dir, int mode) mapping_set_gfp_mask(inode->i_mapping, mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS); + root = NILFS_I(dir)->i_root; ii = NILFS_I(inode); ii->i_state = 1 << NILFS_I_NEW; + ii->i_root = root; err = nilfs_ifile_create_inode(sbi->s_ifile, &ino, &ii->i_bh); if (unlikely(err)) @@ -484,7 +488,7 @@ static int nilfs_iget_test(struct inode *inode, void *opaque) struct nilfs_iget_args *args = opaque; struct nilfs_inode_info *ii; - if (args->ino != inode->i_ino) + if (args->ino != inode->i_ino || args->root != NILFS_I(inode)->i_root) return 0; ii = NILFS_I(inode); @@ -502,13 +506,21 @@ static int nilfs_iget_set(struct inode *inode, void *opaque) if (args->for_gc) { NILFS_I(inode)->i_state = 1 << NILFS_I_GCINODE; NILFS_I(inode)->i_cno = args->cno; + NILFS_I(inode)->i_root = NULL; + } else { + if (args->root && args->ino == NILFS_ROOT_INO) + nilfs_get_root(args->root); + NILFS_I(inode)->i_root = args->root; } return 0; } -struct inode *nilfs_iget(struct super_block *sb, unsigned long ino) +struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root, + unsigned long ino) { - struct nilfs_iget_args args = { .ino = ino, .cno = 0, .for_gc = 0 }; + struct nilfs_iget_args args = { + .ino = ino, .root = root, .cno = 0, .for_gc = 0 + }; struct inode *inode; int err; @@ -530,7 +542,9 @@ struct inode *nilfs_iget(struct super_block *sb, unsigned long ino) struct inode *nilfs_iget_for_gc(struct super_block *sb, unsigned long ino, __u64 cno) { - struct nilfs_iget_args args = { .ino = ino, .cno = cno, .for_gc = 1 }; + struct nilfs_iget_args args = { + .ino = ino, .root = NULL, .cno = cno, .for_gc = 1 + }; struct inode *inode; int err; @@ -682,6 +696,9 @@ static void nilfs_clear_inode(struct inode *inode) nilfs_bmap_clear(ii->i_bmap); nilfs_btnode_cache_clear(&ii->i_btnode_cache); + + if (ii->i_root && inode->i_ino == NILFS_ROOT_INO) + nilfs_put_root(ii->i_root); } void nilfs_evict_inode(struct inode *inode) @@ -690,7 +707,7 @@ void nilfs_evict_inode(struct inode *inode) struct super_block *sb = inode->i_sb; struct nilfs_inode_info *ii = NILFS_I(inode); - if (inode->i_nlink || unlikely(is_bad_inode(inode))) { + if (inode->i_nlink || !ii->i_root || unlikely(is_bad_inode(inode))) { if (inode->i_data.nrpages) truncate_inode_pages(&inode->i_data, 0); end_writeback(inode); diff --git a/fs/nilfs2/namei.c b/fs/nilfs2/namei.c index ad6ed2c..1110d56 100644 --- a/fs/nilfs2/namei.c +++ b/fs/nilfs2/namei.c @@ -70,7 +70,7 @@ nilfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) ino = nilfs_inode_by_name(dir, &dentry->d_name); inode = NULL; if (ino) { - inode = nilfs_iget(dir->i_sb, ino); + inode = nilfs_iget(dir->i_sb, NILFS_I(dir)->i_root, ino); if (IS_ERR(inode)) return ERR_CAST(inode); } @@ -87,7 +87,8 @@ struct dentry *nilfs_get_parent(struct dentry *child) if (!ino) return ERR_PTR(-ENOENT); - inode = nilfs_iget(child->d_inode->i_sb, ino); + inode = nilfs_iget(child->d_inode->i_sb, + NILFS_I(child->d_inode)->i_root, ino); if (IS_ERR(inode)) return ERR_CAST(inode); return d_obtain_alias(inode); diff --git a/fs/nilfs2/nilfs.h b/fs/nilfs2/nilfs.h index 797cd43..21d90c4 100644 --- a/fs/nilfs2/nilfs.h +++ b/fs/nilfs2/nilfs.h @@ -59,6 +59,7 @@ struct nilfs_inode_info { #endif struct buffer_head *i_bh; /* i_bh contains a new or dirty disk inode */ + struct nilfs_root *i_root; struct inode vfs_inode; }; @@ -247,7 +248,8 @@ extern int nilfs_get_block(struct inode *, sector_t, struct buffer_head *, int); extern void nilfs_set_inode_flags(struct inode *); extern int nilfs_read_inode_common(struct inode *, struct nilfs_inode *); extern void nilfs_write_inode_common(struct inode *, struct nilfs_inode *, int); -extern struct inode *nilfs_iget(struct super_block *, unsigned long); +struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root, + unsigned long ino); extern struct inode *nilfs_iget_for_gc(struct super_block *sb, unsigned long ino, __u64 cno); extern void nilfs_update_inode(struct inode *, struct buffer_head *); @@ -285,7 +287,8 @@ extern struct nilfs_super_block **nilfs_prepare_super(struct nilfs_sb_info *, int flip); extern int nilfs_commit_super(struct nilfs_sb_info *, int); extern int nilfs_cleanup_super(struct nilfs_sb_info *); -extern int nilfs_attach_checkpoint(struct nilfs_sb_info *, __u64); +int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno, int curr_mnt, + struct nilfs_root **root); extern void nilfs_detach_checkpoint(struct nilfs_sb_info *); /* gcinode.c */ diff --git a/fs/nilfs2/recovery.c b/fs/nilfs2/recovery.c index d0c35ef..a9a5ba8 100644 --- a/fs/nilfs2/recovery.c +++ b/fs/nilfs2/recovery.c @@ -504,6 +504,7 @@ static int nilfs_recovery_copy_block(struct the_nilfs *nilfs, static int nilfs_recover_dsync_blocks(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi, + struct nilfs_root *root, struct list_head *head, unsigned long *nr_salvaged_blocks) { @@ -515,7 +516,7 @@ static int nilfs_recover_dsync_blocks(struct the_nilfs *nilfs, int err = 0, err2 = 0; list_for_each_entry_safe(rb, n, head, list) { - inode = nilfs_iget(sbi->s_super, rb->ino); + inode = nilfs_iget(sbi->s_super, root, rb->ino); if (IS_ERR(inode)) { err = PTR_ERR(inode); inode = NULL; @@ -578,6 +579,7 @@ static int nilfs_recover_dsync_blocks(struct the_nilfs *nilfs, */ static int nilfs_do_roll_forward(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi, + struct nilfs_root *root, struct nilfs_recovery_info *ri) { struct buffer_head *bh_sum = NULL; @@ -649,7 +651,7 @@ static int nilfs_do_roll_forward(struct the_nilfs *nilfs, goto failed; if (flags & NILFS_SS_LOGEND) { err = nilfs_recover_dsync_blocks( - nilfs, sbi, &dsync_blocks, + nilfs, sbi, root, &dsync_blocks, &nsalvaged_blocks); if (unlikely(err)) goto failed; @@ -746,19 +748,20 @@ int nilfs_salvage_orphan_logs(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi, struct nilfs_recovery_info *ri) { + struct nilfs_root *root; int err; if (ri->ri_lsegs_start == 0 || ri->ri_lsegs_end == 0) return 0; - err = nilfs_attach_checkpoint(sbi, ri->ri_cno); + err = nilfs_attach_checkpoint(sbi, ri->ri_cno, true, &root); if (unlikely(err)) { printk(KERN_ERR "NILFS: error loading the latest checkpoint.\n"); return err; } - err = nilfs_do_roll_forward(nilfs, sbi, ri); + err = nilfs_do_roll_forward(nilfs, sbi, root, ri); if (unlikely(err)) goto failed; @@ -789,6 +792,7 @@ int nilfs_salvage_orphan_logs(struct the_nilfs *nilfs, failed: nilfs_detach_checkpoint(sbi); + nilfs_put_root(root); return err; } diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c index f3a00a3..a1c0e38 100644 --- a/fs/nilfs2/super.c +++ b/fs/nilfs2/super.c @@ -391,18 +391,24 @@ static int nilfs_sync_fs(struct super_block *sb, int wait) return err; } -int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno) +int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno, int curr_mnt, + struct nilfs_root **rootp) { struct the_nilfs *nilfs = sbi->s_nilfs; + struct nilfs_root *root; struct nilfs_checkpoint *raw_cp; struct buffer_head *bh_cp; - int err; + int err = -ENOMEM; + + root = nilfs_find_or_create_root( + nilfs, curr_mnt ? NILFS_CPTREE_CURRENT_CNO : cno); + if (!root) + return err; down_write(&nilfs->ns_super_sem); list_add(&sbi->s_list, &nilfs->ns_supers); up_write(&nilfs->ns_super_sem); - err = -ENOMEM; sbi->s_ifile = nilfs_ifile_new(sbi, nilfs->ns_inode_size); if (!sbi->s_ifile) goto delist; @@ -428,6 +434,8 @@ int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno) atomic_set(&sbi->s_blocks_count, le64_to_cpu(raw_cp->cp_blocks_count)); nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); + + *rootp = root; return 0; failed_bh: @@ -440,6 +448,7 @@ int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno) down_write(&nilfs->ns_super_sem); list_del_init(&sbi->s_list); up_write(&nilfs->ns_super_sem); + nilfs_put_root(root); return err; } @@ -551,12 +560,20 @@ static struct inode * nilfs_nfs_get_inode(struct super_block *sb, u64 ino, u32 generation) { struct inode *inode; + struct nilfs_root *root; if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO && ino != NILFS_SKETCH_INO) return ERR_PTR(-ESTALE); - inode = nilfs_iget(sb, ino); + root = nilfs_lookup_root(NILFS_SB(sb)->s_nilfs, + NILFS_CPTREE_CURRENT_CNO); + if (!root) + return ERR_PTR(-ESTALE); + + /* new file handle type is required to export snapshots */ + inode = nilfs_iget(sb, root, ino); + nilfs_put_root(root); if (IS_ERR(inode)) return ERR_CAST(inode); if (generation && inode->i_generation != generation) { @@ -815,9 +832,10 @@ nilfs_fill_super(struct super_block *sb, void *data, int silent, struct the_nilfs *nilfs) { struct nilfs_sb_info *sbi; + struct nilfs_root *fsroot; struct inode *root; __u64 cno; - int err; + int err, curr_mnt; sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); if (!sbi) @@ -859,6 +877,7 @@ nilfs_fill_super(struct super_block *sb, void *data, int silent, goto failed_sbi; cno = nilfs_last_cno(nilfs); + curr_mnt = true; if (sb->s_flags & MS_RDONLY) { if (nilfs_test_opt(sbi, SNAPSHOT)) { @@ -881,10 +900,11 @@ nilfs_fill_super(struct super_block *sb, void *data, int silent, goto failed_sbi; } cno = sbi->s_snapshot_cno; + curr_mnt = false; } } - err = nilfs_attach_checkpoint(sbi, cno); + err = nilfs_attach_checkpoint(sbi, cno, curr_mnt, &fsroot); if (err) { printk(KERN_ERR "NILFS: error loading a checkpoint" " (checkpoint number=%llu).\n", (unsigned long long)cno); @@ -897,7 +917,7 @@ nilfs_fill_super(struct super_block *sb, void *data, int silent, goto failed_checkpoint; } - root = nilfs_iget(sb, NILFS_ROOT_INO); + root = nilfs_iget(sb, fsroot, NILFS_ROOT_INO); if (IS_ERR(root)) { printk(KERN_ERR "NILFS: get root inode failed\n"); err = PTR_ERR(root); @@ -917,6 +937,8 @@ nilfs_fill_super(struct super_block *sb, void *data, int silent, goto failed_segctor; } + nilfs_put_root(fsroot); + if (!(sb->s_flags & MS_RDONLY)) { down_write(&nilfs->ns_sem); nilfs_setup_super(sbi); @@ -935,6 +957,7 @@ nilfs_fill_super(struct super_block *sb, void *data, int silent, failed_checkpoint: nilfs_detach_checkpoint(sbi); + nilfs_put_root(fsroot); failed_sbi: put_nilfs(nilfs); -- cgit v1.1