/** * nilfs_cpfile_read - read or get cpfile inode * @sb: super block instance * @cpsize: size of a checkpoint entry * @raw_inode: on-disk cpfile inode * @inodep: buffer to store the inode */ int nilfs_cpfile_read(struct super_block *sb, size_t cpsize, struct nilfs_inode *raw_inode, struct inode **inodep) { struct inode *cpfile; int err; cpfile = nilfs_iget_locked(sb, NULL, NILFS_CPFILE_INO); if (unlikely(!cpfile)) return -ENOMEM; if (!(cpfile->i_state & I_NEW)) goto out; err = nilfs_mdt_init(cpfile, NILFS_MDT_GFP, 0); if (err) goto failed; nilfs_mdt_set_entry_size(cpfile, cpsize, sizeof(struct nilfs_cpfile_header)); err = nilfs_read_inode_common(cpfile, raw_inode); if (err) goto failed; unlock_new_inode(cpfile); out: *inodep = cpfile; return 0; failed: iget_failed(cpfile); return err; }
/** * nilfs_dat_read - read or get dat inode * @sb: super block instance * @entry_size: size of a dat entry * @raw_inode: on-disk dat inode * @inodep: buffer to store the inode */ int nilfs_dat_read(struct super_block *sb, size_t entry_size, struct nilfs_inode *raw_inode, struct inode **inodep) { static struct lock_class_key dat_lock_key; struct inode *dat; struct nilfs_dat_info *di; int err; if (entry_size > sb->s_blocksize) { printk(KERN_ERR "NILFS: too large DAT entry size: %zu bytes.\n", entry_size); return -EINVAL; } else if (entry_size < NILFS_MIN_DAT_ENTRY_SIZE) { printk(KERN_ERR "NILFS: too small DAT entry size: %zu bytes.\n", entry_size); return -EINVAL; } dat = nilfs_iget_locked(sb, NULL, NILFS_DAT_INO); if (unlikely(!dat)) return -ENOMEM; if (!(dat->i_state & I_NEW)) goto out; err = nilfs_mdt_init(dat, NILFS_MDT_GFP, sizeof(*di)); if (err) goto failed; err = nilfs_palloc_init_blockgroup(dat, entry_size); if (err) goto failed; di = NILFS_DAT_I(dat); lockdep_set_class(&di->mi.mi_sem, &dat_lock_key); nilfs_palloc_setup_cache(dat, &di->palloc_cache); nilfs_mdt_setup_shadow_map(dat, &di->shadow); err = nilfs_read_inode_common(dat, raw_inode); if (err) goto failed; unlock_new_inode(dat); out: *inodep = dat; return 0; failed: iget_failed(dat); return err; }
int nilfs_sufile_read(struct super_block *sb, size_t susize, struct nilfs_inode *raw_inode, struct inode **inodep) { struct inode *sufile; struct nilfs_sufile_info *sui; struct buffer_head *header_bh; struct nilfs_sufile_header *header; void *kaddr; int err; sufile = nilfs_iget_locked(sb, NULL, NILFS_SUFILE_INO); if (unlikely(!sufile)) return -ENOMEM; if (!(sufile->i_state & I_NEW)) goto out; err = nilfs_mdt_init(sufile, NILFS_MDT_GFP, sizeof(*sui)); if (err) goto failed; nilfs_mdt_set_entry_size(sufile, susize, sizeof(struct nilfs_sufile_header)); err = nilfs_read_inode_common(sufile, raw_inode); if (err) goto failed; err = nilfs_sufile_get_header_block(sufile, &header_bh); if (err) goto failed; sui = NILFS_SUI(sufile); kaddr = kmap_atomic(header_bh->b_page); header = kaddr + bh_offset(header_bh); sui->ncleansegs = le64_to_cpu(header->sh_ncleansegs); kunmap_atomic(kaddr); brelse(header_bh); sui->allocmax = nilfs_sufile_get_nsegments(sufile) - 1; sui->allocmin = 0; unlock_new_inode(sufile); out: *inodep = sufile; return 0; failed: iget_failed(sufile); return err; }
/** * nilfs_cpfile_read - read or get cpfile inode * @sb: super block instance * @cpsize: size of a checkpoint entry * @raw_inode: on-disk cpfile inode * @inodep: buffer to store the inode */ int nilfs_cpfile_read(struct super_block *sb, size_t cpsize, struct nilfs_inode *raw_inode, struct inode **inodep) { struct inode *cpfile; int err; if (cpsize > sb->s_blocksize) { printk(KERN_ERR "NILFS: too large checkpoint size: %zu bytes.\n", cpsize); return -EINVAL; } else if (cpsize < NILFS_MIN_CHECKPOINT_SIZE) { printk(KERN_ERR "NILFS: too small checkpoint size: %zu bytes.\n", cpsize); return -EINVAL; } cpfile = nilfs_iget_locked(sb, NULL, NILFS_CPFILE_INO); if (unlikely(!cpfile)) return -ENOMEM; if (!(cpfile->i_state & I_NEW)) goto out; err = nilfs_mdt_init(cpfile, NILFS_MDT_GFP, 0); if (err) goto failed; nilfs_mdt_set_entry_size(cpfile, cpsize, sizeof(struct nilfs_cpfile_header)); err = nilfs_read_inode_common(cpfile, raw_inode); if (err) goto failed; unlock_new_inode(cpfile); out: *inodep = cpfile; return 0; failed: iget_failed(cpfile); return err; }
/** * nilfs_dat_read - read or get dat inode * @sb: super block instance * @entry_size: size of a dat entry * @raw_inode: on-disk dat inode * @inodep: buffer to store the inode */ int nilfs_dat_read(struct super_block *sb, size_t entry_size, struct nilfs_inode *raw_inode, struct inode **inodep) { static struct lock_class_key dat_lock_key; struct inode *dat; struct nilfs_dat_info *di; int err; dat = nilfs_iget_locked(sb, NULL, NILFS_DAT_INO); if (unlikely(!dat)) return -ENOMEM; if (!(dat->i_state & I_NEW)) goto out; err = nilfs_mdt_init(dat, NILFS_MDT_GFP, sizeof(*di)); if (err) goto failed; err = nilfs_palloc_init_blockgroup(dat, entry_size); if (err) goto failed; di = NILFS_DAT_I(dat); lockdep_set_class(&di->mi.mi_sem, &dat_lock_key); nilfs_palloc_setup_cache(dat, &di->palloc_cache); nilfs_mdt_setup_shadow_map(dat, &di->shadow); err = nilfs_read_inode_common(dat, raw_inode); if (err) goto failed; unlock_new_inode(dat); out: *inodep = dat; return 0; failed: iget_failed(dat); return err; }
/** * nilfs_ifile_read - read or get ifile inode * @sb: super block instance * @root: root object * @inode_size: size of an inode * @raw_inode: on-disk ifile inode * @inodep: buffer to store the inode */ int nilfs_ifile_read(struct super_block *sb, struct nilfs_root *root, size_t inode_size, struct nilfs_inode *raw_inode, struct inode **inodep) { struct inode *ifile; int err; ifile = nilfs_iget_locked(sb, root, NILFS_IFILE_INO); if (unlikely(!ifile)) return -ENOMEM; if (!(ifile->i_state & I_NEW)) goto out; err = nilfs_mdt_init(ifile, NILFS_MDT_GFP, sizeof(struct nilfs_ifile_info)); if (err) goto failed; err = nilfs_palloc_init_blockgroup(ifile, inode_size); if (err) goto failed; nilfs_palloc_setup_cache(ifile, &NILFS_IFILE_I(ifile)->palloc_cache); err = nilfs_read_inode_common(ifile, raw_inode); if (err) goto failed; unlock_new_inode(ifile); out: *inodep = ifile; return 0; failed: iget_failed(ifile); return err; }
struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root, unsigned long ino) { struct nilfs_iget_args args = { .ino = ino, .root = root, .cno = 0, .for_gc = 0 }; return ilookup5(sb, ino, nilfs_iget_test, &args); } struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root, unsigned long ino) { struct nilfs_iget_args args = { .ino = ino, .root = root, .cno = 0, .for_gc = 0 }; return iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args); } struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root, unsigned long ino) { struct inode *inode; int err; inode = nilfs_iget_locked(sb, root, ino); if (unlikely(!inode)) return ERR_PTR(-ENOMEM); if (!(inode->i_state & I_NEW)) return inode; err = __nilfs_read_inode(sb, root, ino, inode); if (unlikely(err)) { iget_failed(inode); return ERR_PTR(err); } unlock_new_inode(inode); return inode; } struct inode *nilfs_iget_for_gc(struct super_block *sb, unsigned long ino, __u64 cno) { struct nilfs_iget_args args = { .ino = ino, .root = NULL, .cno = cno, .for_gc = 1 }; struct inode *inode; int err; inode = iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args); if (unlikely(!inode)) return ERR_PTR(-ENOMEM); if (!(inode->i_state & I_NEW)) return inode; err = nilfs_init_gcinode(inode); if (unlikely(err)) { iget_failed(inode); return ERR_PTR(err); } unlock_new_inode(inode); return inode; } void nilfs_write_inode_common(struct inode *inode, struct nilfs_inode *raw_inode, int has_bmap) { struct nilfs_inode_info *ii = NILFS_I(inode); raw_inode->i_mode = cpu_to_le16(inode->i_mode); raw_inode->i_uid = cpu_to_le32(inode->i_uid); raw_inode->i_gid = cpu_to_le32(inode->i_gid); raw_inode->i_links_count = cpu_to_le16(inode->i_nlink); raw_inode->i_size = cpu_to_le64(inode->i_size); raw_inode->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); raw_inode->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec); raw_inode->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); raw_inode->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec); raw_inode->i_blocks = cpu_to_le64(inode->i_blocks); raw_inode->i_flags = cpu_to_le32(ii->i_flags); raw_inode->i_generation = cpu_to_le32(inode->i_generation); if (NILFS_ROOT_METADATA_FILE(inode->i_ino)) { struct the_nilfs *nilfs = inode->i_sb->s_fs_info; /* zero-fill unused portion in the case of super root block */ raw_inode->i_xattr = 0; raw_inode->i_pad = 0; memset((void *)raw_inode + sizeof(*raw_inode), 0, nilfs->ns_inode_size - sizeof(*raw_inode)); } if (has_bmap) nilfs_bmap_write(ii->i_bmap, raw_inode); else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) raw_inode->i_device_code = cpu_to_le64(huge_encode_dev(inode->i_rdev)); /* When extending inode, nilfs->ns_inode_size should be checked for substitutions of appended fields */ } void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh) { ino_t ino = inode->i_ino; struct nilfs_inode_info *ii = NILFS_I(inode); struct inode *ifile = ii->i_root->ifile; struct nilfs_inode *raw_inode; raw_inode = nilfs_ifile_map_inode(ifile, ino, ibh); if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state)) memset(raw_inode, 0, NILFS_MDT(ifile)->mi_entry_size); set_bit(NILFS_I_INODE_DIRTY, &ii->i_state); nilfs_write_inode_common(inode, raw_inode, 0); /* XXX: call with has_bmap = 0 is a workaround to avoid deadlock of bmap. This delays update of i_bmap to just before writing */ nilfs_ifile_unmap_inode(ifile, ino, ibh); } #define NILFS_MAX_TRUNCATE_BLOCKS 16384 /* 64MB for 4KB block */ static void nilfs_truncate_bmap(struct nilfs_inode_info *ii, unsigned long from) { unsigned long b; int ret; if (!test_bit(NILFS_I_BMAP, &ii->i_state)) return; repeat: ret = nilfs_bmap_last_key(ii->i_bmap, &b); if (ret == -ENOENT) return; else if (ret < 0) goto failed; if (b < from) return; b -= min_t(unsigned long, NILFS_MAX_TRUNCATE_BLOCKS, b - from); ret = nilfs_bmap_truncate(ii->i_bmap, b); nilfs_relax_pressure_in_lock(ii->vfs_inode.i_sb); if (!ret || (ret == -ENOMEM && nilfs_bmap_truncate(ii->i_bmap, b) == 0)) goto repeat; failed: nilfs_warning(ii->vfs_inode.i_sb, __func__, "failed to truncate bmap (ino=%lu, err=%d)", ii->vfs_inode.i_ino, ret); } void nilfs_truncate(struct inode *inode) { unsigned long blkoff; unsigned int blocksize; struct nilfs_transaction_info ti; struct super_block *sb = inode->i_sb; struct nilfs_inode_info *ii = NILFS_I(inode); if (!test_bit(NILFS_I_BMAP, &ii->i_state)) return; if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) return; blocksize = sb->s_blocksize; blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits; nilfs_transaction_begin(sb, &ti, 0); /* never fails */ block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block); nilfs_truncate_bmap(ii, blkoff); inode->i_mtime = inode->i_ctime = CURRENT_TIME; if (IS_SYNC(inode)) nilfs_set_transaction_flag(NILFS_TI_SYNC); nilfs_mark_inode_dirty(inode); nilfs_set_file_dirty(inode, 0); nilfs_transaction_commit(sb); /* May construct a logical segment and may fail in sync mode. But truncate has no return value. */ }
/** * nilfs_sufile_read - read or get sufile inode * @sb: super block instance * @susize: size of a segment usage entry * @raw_inode: on-disk sufile inode * @inodep: buffer to store the inode */ int nilfs_sufile_read(struct super_block *sb, size_t susize, struct nilfs_inode *raw_inode, struct inode **inodep) { struct inode *sufile; struct nilfs_sufile_info *sui; struct buffer_head *header_bh; struct nilfs_sufile_header *header; void *kaddr; int err; if (susize > sb->s_blocksize) { printk(KERN_ERR "NILFS: too large segment usage size: %zu bytes.\n", susize); return -EINVAL; } else if (susize < NILFS_MIN_SEGMENT_USAGE_SIZE) { printk(KERN_ERR "NILFS: too small segment usage size: %zu bytes.\n", susize); return -EINVAL; } sufile = nilfs_iget_locked(sb, NULL, NILFS_SUFILE_INO); if (unlikely(!sufile)) return -ENOMEM; if (!(sufile->i_state & I_NEW)) goto out; err = nilfs_mdt_init(sufile, NILFS_MDT_GFP, sizeof(*sui)); if (err) goto failed; nilfs_mdt_set_entry_size(sufile, susize, sizeof(struct nilfs_sufile_header)); err = nilfs_read_inode_common(sufile, raw_inode); if (err) goto failed; err = nilfs_sufile_get_header_block(sufile, &header_bh); if (err) goto failed; sui = NILFS_SUI(sufile); kaddr = kmap_atomic(header_bh->b_page, KM_USER0); header = kaddr + bh_offset(header_bh); sui->ncleansegs = le64_to_cpu(header->sh_ncleansegs); kunmap_atomic(kaddr, KM_USER0); brelse(header_bh); sui->allocmax = nilfs_sufile_get_nsegments(sufile) - 1; sui->allocmin = 0; unlock_new_inode(sufile); out: *inodep = sufile; return 0; failed: iget_failed(sufile); return err; }