diff options
| -rw-r--r-- | fs/nilfs2/inode.c | 819 |
1 files changed, 819 insertions, 0 deletions
diff --git a/fs/nilfs2/inode.c b/fs/nilfs2/inode.c new file mode 100644 index 000000000000..b4697d9d7e5d --- /dev/null +++ b/fs/nilfs2/inode.c @@ -0,0 +1,819 @@ +/* + * inode.c - NILFS inode operations. + * + * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * + * Written by Ryusuke Konishi <ryusuke@osrg.net> + * + */ + +#include <linux/buffer_head.h> +#include <linux/mpage.h> +#include <linux/writeback.h> +#include "nilfs.h" +#include "segment.h" +#include "page.h" +#include "mdt.h" +#include "cpfile.h" +#include "ifile.h" + + +/** + * nilfs_get_block() - get a file block on the filesystem (callback function) + * @inode - inode struct of the target file + * @blkoff - file block number + * @bh_result - buffer head to be mapped on + * @create - indicate whether allocating the block or not when it has not + * been allocated yet. + * + * This function does not issue actual read request of the specified data + * block. It is done by VFS. + * Bulk read for direct-io is not supported yet. (should be supported) + */ +int nilfs_get_block(struct inode *inode, sector_t blkoff, + struct buffer_head *bh_result, int create) +{ + struct nilfs_inode_info *ii = NILFS_I(inode); + unsigned long blknum = 0; + int err = 0, ret; + struct inode *dat = nilfs_dat_inode(NILFS_I_NILFS(inode)); + + /* This exclusion control is a workaround; should be revised */ + down_read(&NILFS_MDT(dat)->mi_sem); /* XXX */ + ret = nilfs_bmap_lookup(ii->i_bmap, (unsigned long)blkoff, &blknum); + up_read(&NILFS_MDT(dat)->mi_sem); /* XXX */ + if (ret == 0) { /* found */ + map_bh(bh_result, inode->i_sb, blknum); + goto out; + } + if (unlikely(ret == 1)) { + printk(KERN_ERR "nilfs_get_block: bmap_lookup returns " + "buffer_head pointer (blkoff=%llu, blknum=%lu)\n", + (unsigned long long)blkoff, blknum); + BUG(); + } + /* data block was not found */ + if (ret == -ENOENT && create) { + struct nilfs_transaction_info ti; + + bh_result->b_blocknr = 0; + err = nilfs_transaction_begin(inode->i_sb, &ti, 1); + if (unlikely(err)) + goto out; + err = nilfs_bmap_insert(ii->i_bmap, (unsigned long)blkoff, + (unsigned long)bh_result); + nilfs_transaction_end(inode->i_sb, !err); + if (unlikely(err != 0)) { + if (err == -EEXIST) { + /* + * The get_block() function could be called + * from multiple callers for an inode. + * However, the page having this block must + * be locked in this case. + */ + printk(KERN_ERR + "nilfs_get_block: a race condition " + "while inserting a data block. " + "(inode number=%lu, file block " + "offset=%llu)\n", + inode->i_ino, + (unsigned long long)blkoff); + BUG(); + } else if (err == -EINVAL) { + nilfs_error(inode->i_sb, __func__, + "broken bmap (inode=%lu)\n", + inode->i_ino); + err = -EIO; + } + goto out; + } + /* Error handling should be detailed */ + set_buffer_new(bh_result); + map_bh(bh_result, inode->i_sb, 0); /* dbn must be changed + to proper value */ + } else if (ret == -ENOENT) { + /* not found is not error (e.g. hole); must return without + the mapped state flag. */ + ; + } else { + err = ret; + } + + out: + return err; +} + +/** + * nilfs_readpage() - implement readpage() method of nilfs_aops {} + * address_space_operations. + * @file - file struct of the file to be read + * @page - the page to be read + */ +static int nilfs_readpage(struct file *file, struct page *page) +{ + return mpage_readpage(page, nilfs_get_block); +} + +/** + * nilfs_readpages() - implement readpages() method of nilfs_aops {} + * address_space_operations. + * @file - file struct of the file to be read + * @mapping - address_space struct used for reading multiple pages + * @pages - the pages to be read + * @nr_pages - number of pages to be read + */ +static int nilfs_readpages(struct file *file, struct address_space *mapping, + struct list_head *pages, unsigned nr_pages) +{ + return mpage_readpages(mapping, pages, nr_pages, nilfs_get_block); +} + +static int nilfs_writepages(struct address_space *mapping, + struct writeback_control *wbc) +{ + /* This empty method is required not to call generic_writepages() */ + return 0; +} + +static int nilfs_writepage(struct page *page, struct writeback_control *wbc) +{ + struct inode *inode = page->mapping->host; + int err; + + redirty_page_for_writepage(wbc, page); + unlock_page(page); + + if (wbc->sync_mode == WB_SYNC_ALL) { + err = nilfs_construct_segment(inode->i_sb); + if (unlikely(err)) + return err; + } else if (wbc->for_reclaim) + nilfs_flush_segment(inode->i_sb, inode->i_ino); + + return 0; +} + +static int nilfs_set_page_dirty(struct page *page) +{ + int ret = __set_page_dirty_buffers(page); + + if (ret) { + struct inode *inode = page->mapping->host; + struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb); + unsigned nr_dirty = 1 << (PAGE_SHIFT - inode->i_blkbits); + + nilfs_set_file_dirty(sbi, inode, nr_dirty); + } + return ret; +} + +static int nilfs_write_begin(struct file *file, struct address_space *mapping, + loff_t pos, unsigned len, unsigned flags, + struct page **pagep, void **fsdata) + +{ + struct inode *inode = mapping->host; + int err = nilfs_transaction_begin(inode->i_sb, NULL, 1); + + if (unlikely(err)) + return err; + + *pagep = NULL; + err = block_write_begin(file, mapping, pos, len, flags, pagep, + fsdata, nilfs_get_block); + if (unlikely(err)) + nilfs_transaction_end(inode->i_sb, 0); + return err; +} + +static int nilfs_write_end(struct file *file, struct address_space *mapping, + loff_t pos, unsigned len, unsigned copied, + struct page *page, void *fsdata) +{ + struct inode *inode = mapping->host; + unsigned start = pos & (PAGE_CACHE_SIZE - 1); + unsigned nr_dirty; + int err; + + nr_dirty = nilfs_page_count_clean_buffers(page, start, + start + copied); + copied = generic_write_end(file, mapping, pos, len, copied, page, + fsdata); + nilfs_set_file_dirty(NILFS_SB(inode->i_sb), inode, nr_dirty); + err = nilfs_transaction_end(inode->i_sb, 1); + return err ? : copied; +} + +static ssize_t +nilfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov, + loff_t offset, unsigned long nr_segs) +{ + struct file *file = iocb->ki_filp; + struct inode *inode = file->f_mapping->host; + ssize_t size; + int err; + + err = nilfs_construct_dsync_segment(inode->i_sb, inode); + if (unlikely(err)) + return err; + + if (rw == WRITE) + return 0; + + /* Needs synchronization with the cleaner */ + size = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, + offset, nr_segs, nilfs_get_block, NULL); + return size; +} + +struct address_space_operations nilfs_aops = { + .writepage = nilfs_writepage, + .readpage = nilfs_readpage, + /* .sync_page = nilfs_sync_page, */ + .writepages = nilfs_writepages, + .set_page_dirty = nilfs_set_page_dirty, + .readpages = nilfs_readpages, + .write_begin = nilfs_write_begin, + .write_end = nilfs_write_end, + /* .releasepage = nilfs_releasepage, */ + .invalidatepage = block_invalidatepage, + .direct_IO = nilfs_direct_IO, +}; + +struct inode *nilfs_new_inode(struct inode *dir, int mode) +{ + struct super_block *sb = dir->i_sb; + struct nilfs_sb_info *sbi = NILFS_SB(sb); + struct inode *inode; + struct nilfs_inode_info *ii; + int err = -ENOMEM; + ino_t ino; + + inode = new_inode(sb); + if (unlikely(!inode)) + goto failed; + + mapping_set_gfp_mask(inode->i_mapping, + mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS); + + ii = NILFS_I(inode); + ii->i_state = 1 << NILFS_I_NEW; + + err = nilfs_ifile_create_inode(sbi->s_ifile, &ino, &ii->i_bh); + if (unlikely(err)) + goto failed_ifile_create_inode; + /* reference count of i_bh inherits from nilfs_mdt_read_block() */ + + atomic_inc(&sbi->s_inodes_count); + + inode->i_uid = current_fsuid(); + if (dir->i_mode & S_ISGID) { + inode->i_gid = dir->i_gid; + if (S_ISDIR(mode)) + mode |= S_ISGID; + } else + inode->i_gid = current_fsgid(); + + inode->i_mode = mode; + inode->i_ino = ino; + inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; + + if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) { + err = nilfs_bmap_read(ii->i_bmap, NULL); + if (err < 0) + goto failed_bmap; + + set_bit(NILFS_I_BMAP, &ii->i_state); + /* No lock is needed; iget() ensures it. */ + } + + ii->i_flags = NILFS_I(dir)->i_flags; + if (S_ISLNK(mode)) + ii->i_flags &= ~(NILFS_IMMUTABLE_FL | NILFS_APPEND_FL); + if (!S_ISDIR(mode)) + ii->i_flags &= ~NILFS_DIRSYNC_FL; + + /* ii->i_file_acl = 0; */ + /* ii->i_dir_acl = 0; */ + ii->i_dtime = 0; + ii->i_dir_start_lookup = 0; +#ifdef CONFIG_NILFS_FS_POSIX_ACL + ii->i_acl = NULL; + ii->i_default_acl = NULL; +#endif + ii->i_cno = 0; + nilfs_set_inode_flags(inode); + spin_lock(&sbi->s_next_gen_lock); + inode->i_generation = sbi->s_next_generation++; + spin_unlock(&sbi->s_next_gen_lock); + insert_inode_hash(inode); + + err = nilfs_init_acl(inode, dir); + if (unlikely(err)) + goto failed_acl; /* never occur. When supporting + nilfs_init_acl(), proper cancellation of + above jobs should be considered */ + + mark_inode_dirty(inode); + return inode; + + failed_acl: + failed_bmap: + inode->i_nlink = 0; + iput(inode); /* raw_inode will be deleted through + generic_delete_inode() */ + goto failed; + + failed_ifile_create_inode: + make_bad_inode(inode); + iput(inode); /* if i_nlink == 1, generic_forget_inode() will be + called */ + failed: + return ERR_PTR(err); +} + +void nilfs_free_inode(struct inode *inode) +{ + struct super_block *sb = inode->i_sb; + struct nilfs_sb_info *sbi = NILFS_SB(sb); + + clear_inode(inode); + /* XXX: check error code? Is there any thing I can do? */ + (void) nilfs_ifile_delete_inode(sbi->s_ifile, inode->i_ino); + atomic_dec(&sbi->s_inodes_count); +} + +void nilfs_set_inode_flags(struct inode *inode) +{ + unsigned int flags = NILFS_I(inode)->i_flags; + + inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | + S_DIRSYNC); + if (flags & NILFS_SYNC_FL) + inode->i_flags |= S_SYNC; + if (flags & NILFS_APPEND_FL) + inode->i_flags |= S_APPEND; + if (flags & NILFS_IMMUTABLE_FL) + inode->i_flags |= S_IMMUTABLE; +#ifndef NILFS_ATIME_DISABLE + if (flags & NILFS_NOATIME_FL) +#endif + inode->i_flags |= S_NOATIME; + if (flags & NILFS_DIRSYNC_FL) + inode->i_flags |= S_DIRSYNC; + mapping_set_gfp_mask(inode->i_mapping, + mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS); +} + +int nilfs_read_inode_common(struct inode *inode, + struct nilfs_inode *raw_inode) +{ + struct nilfs_inode_info *ii = NILFS_I(inode); + int err; + + inode->i_mode = le16_to_cpu(raw_inode->i_mode); + inode->i_uid = (uid_t)le32_to_cpu(raw_inode->i_uid); + inode->i_gid = (gid_t)le32_to_cpu(raw_inode->i_gid); + inode->i_nlink = le16_to_cpu(raw_inode->i_links_count); + inode->i_size = le64_to_cpu(raw_inode->i_size); + inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime); + inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime); + inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime); + inode->i_atime.tv_nsec = 0; + inode->i_ctime.tv_nsec = 0; + inode->i_mtime.tv_nsec = 0; + ii->i_dtime = le64_to_cpu(raw_inode->i_dtime); + if (inode->i_nlink == 0 && (inode->i_mode == 0 || ii->i_dtime)) + return -EINVAL; /* this inode is deleted */ + + inode->i_blocks = le64_to_cpu(raw_inode->i_blocks); + ii->i_flags = le32_to_cpu(raw_inode->i_flags); +#if 0 + ii->i_file_acl = le32_to_cpu(raw_inode->i_file_acl); + ii->i_dir_acl = S_ISREG(inode->i_mode) ? + 0 : le32_to_cpu(raw_inode->i_dir_acl); +#endif + ii->i_cno = 0; + inode->i_generation = le32_to_cpu(raw_inode->i_generation); + + if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || + S_ISLNK(inode->i_mode)) { + err = nilfs_bmap_read(ii->i_bmap, raw_inode); + if (err < 0) + return err; + set_bit(NILFS_I_BMAP, &ii->i_state); + /* No lock is needed; iget() ensures it. */ + } + return 0; +} + +static int nilfs_read_sketch_inode(struct inode *inode) +{ + struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb); + int err = 0; + + if (sbi->s_snapshot_cno) { + struct the_nilfs *nilfs = sbi->s_nilfs; + struct buffer_head *bh_cp; + struct nilfs_checkpoint *raw_cp; + + err = nilfs_cpfile_get_checkpoint( + nilfs->ns_cpfile, sbi->s_snapshot_cno, 0, &raw_cp, + &bh_cp); + if (likely(!err)) { + if (!nilfs_checkpoint_sketch(raw_cp)) + inode->i_size = 0; + nilfs_cpfile_put_checkpoint( + nilfs->ns_cpfile, sbi->s_snapshot_cno, bh_cp); + } + inode->i_flags |= S_NOCMTIME; + } + return err; +} + +static int __nilfs_read_inode(struct super_block *sb, unsigned long ino, + struct inode *inode) +{ + struct nilfs_sb_info *sbi = NILFS_SB(sb); + struct inode *dat = nilfs_dat_inode(sbi->s_nilfs); + struct buffer_head *bh; + struct nilfs_inode *raw_inode; + int err; + + down_read(&NILFS_MDT(dat)->mi_sem); /* XXX */ + err = nilfs_ifile_get_inode_block(sbi->s_ifile, ino, &bh); + if (unlikely(err)) + goto bad_inode; + + raw_inode = nilfs_ifile_map_inode(sbi->s_ifile, ino, bh); + +#ifdef CONFIG_NILFS_FS_POSIX_ACL + ii->i_acl = NILFS_ACL_NOT_CACHED; + ii->i_default_acl = NILFS_ACL_NOT_CACHED; +#endif + if (nilfs_read_inode_common(inode, raw_inode)) + goto failed_unmap; + + if (S_ISREG(inode->i_mode)) { + inode->i_op = &nilfs_file_inode_operations; + inode->i_fop = &nilfs_file_operations; + inode->i_mapping->a_ops = &nilfs_aops; + if (unlikely(inode->i_ino == NILFS_SKETCH_INO)) { + err = nilfs_read_sketch_inode(inode); + if (unlikely(err)) + goto failed_unmap; + } + } else if (S_ISDIR(inode->i_mode)) { + inode->i_op = &nilfs_dir_inode_operations; + inode->i_fop = &nilfs_dir_operations; + inode->i_mapping->a_ops = &nilfs_aops; + } else if (S_ISLNK(inode->i_mode)) { + inode->i_op = &nilfs_symlink_inode_operations; + inode->i_mapping->a_ops = &nilfs_aops; + } else { + inode->i_op = &nilfs_special_inode_operations; + init_special_inode( + inode, inode->i_mode, + new_decode_dev(le64_to_cpu(raw_inode->i_device_code))); + } + nilfs_ifile_unmap_inode(sbi->s_ifile, ino, bh); + brelse(bh); + up_read(&NILFS_MDT(dat)->mi_sem); /* XXX */ + nilfs_set_inode_flags(inode); + return 0; + + failed_unmap: + nilfs_ifile_unmap_inode(sbi->s_ifile, ino, bh); + brelse(bh); + + bad_inode: + up_read(&NILFS_MDT(dat)->mi_sem); /* XXX */ + return err; +} + +struct inode *nilfs_iget(struct super_block *sb, unsigned long ino) +{ + struct inode *inode; + int err; + + inode = iget_locked(sb, ino); + if (unlikely(!inode)) + return ERR_PTR(-ENOMEM); + if (!(inode->i_state & I_NEW)) + return inode; + + err = __nilfs_read_inode(sb, ino, 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_blocks = cpu_to_le64(inode->i_blocks); + + raw_inode->i_dtime = cpu_to_le64(ii->i_dtime); + raw_inode->i_flags = cpu_to_le32(ii->i_flags); + raw_inode->i_generation = cpu_to_le32(inode->i_generation); + + 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(new_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 super_block *sb = inode->i_sb; + struct nilfs_sb_info *sbi = NILFS_SB(sb); + struct nilfs_inode *raw_inode; + + raw_inode = nilfs_ifile_map_inode(sbi->s_ifile, ino, ibh); + + /* The buffer is guarded with lock_buffer() by the caller */ + if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state)) + memset(raw_inode, 0, NILFS_MDT(sbi->s_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(sbi->s_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: + if (ret == -EINVAL) + nilfs_error(ii->vfs_inode.i_sb, __func__, + "bmap is broken (ino=%lu)", ii->vfs_inode.i_ino); + else + 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); + int ret; + + 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; + ret = nilfs_transaction_begin(sb, &ti, 0); + BUG_ON(ret); + + 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_set_file_dirty(NILFS_SB(sb), inode, 0); + nilfs_transaction_end(sb, 1); + /* May construct a logical segment and may fail in sync mode. + But truncate has no return value. */ +} + +void nilfs_delete_inode(struct inode *inode) +{ + struct nilfs_transaction_info ti; + struct super_block *sb = inode->i_sb; + struct nilfs_inode_info *ii = NILFS_I(inode); + int err; + + if (unlikely(is_bad_inode(inode))) { + if (inode->i_data.nrpages) + truncate_inode_pages(&inode->i_data, 0); + clear_inode(inode); + return; + } + err = nilfs_transaction_begin(sb, &ti, 0); + BUG_ON(err); + if (inode->i_data.nrpages) + truncate_inode_pages(&inode->i_data, 0); + + nilfs_truncate_bmap(ii, 0); + nilfs_free_inode(inode); + /* nilfs_free_inode() marks inode buffer dirty */ + if (IS_SYNC(inode)) + nilfs_set_transaction_flag(NILFS_TI_SYNC); + nilfs_transaction_end(sb, 1); + /* May construct a logical segment and may fail in sync mode. + But delete_inode has no return value. */ +} + +int nilfs_setattr(struct dentry *dentry, struct iattr *iattr) +{ + struct nilfs_transaction_info ti; + struct inode *inode = dentry->d_inode; + struct super_block *sb = inode->i_sb; + int err, err2; + + err = inode_change_ok(inode, iattr); + if (err) + return err; + + err = nilfs_transaction_begin(sb, &ti, 0); + if (unlikely(err)) + return err; + err = inode_setattr(inode, iattr); + if (!err && (iattr->ia_valid & ATTR_MODE)) + err = nilfs_acl_chmod(inode); + err2 = nilfs_transaction_end(sb, 1); + return err ? : err2; +} + +int nilfs_load_inode_block(struct nilfs_sb_info *sbi, struct inode *inode, + struct buffer_head **pbh) +{ + struct nilfs_inode_info *ii = NILFS_I(inode); + int err; + + spin_lock(&sbi->s_inode_lock); + /* Caller of this function MUST lock s_inode_lock */ + if (ii->i_bh == NULL) { + spin_unlock(&sbi->s_inode_lock); + err = nilfs_ifile_get_inode_block(sbi->s_ifile, inode->i_ino, + pbh); + if (unlikely(err)) + return err; + spin_lock(&sbi->s_inode_lock); + if (ii->i_bh == NULL) + ii->i_bh = *pbh; + else { + brelse(*pbh); + *pbh = ii->i_bh; + } + } else + *pbh = ii->i_bh; + + get_bh(*pbh); + spin_unlock(&sbi->s_inode_lock); + return 0; +} + +int nilfs_inode_dirty(struct inode *inode) +{ + struct nilfs_inode_info *ii = NILFS_I(inode); + struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb); + int ret = 0; + + if (!list_empty(&ii->i_dirty)) { + spin_lock(&sbi->s_inode_lock); + ret = test_bit(NILFS_I_DIRTY, &ii->i_state) || + test_bit(NILFS_I_BUSY, &ii->i_state); + spin_unlock(&sbi->s_inode_lock); + } + return ret; +} + +int nilfs_set_file_dirty(struct nilfs_sb_info *sbi, struct inode *inode, + unsigned nr_dirty) +{ + struct nilfs_inode_info *ii = NILFS_I(inode); + + atomic_add(nr_dirty, &sbi->s_nilfs->ns_ndirtyblks); + + if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state) || + unlikely(inode->i_ino == NILFS_SKETCH_INO)) + return 0; + + spin_lock(&sbi->s_inode_lock); + if (!test_bit(NILFS_I_QUEUED, &ii->i_state) && + !test_bit(NILFS_I_BUSY, &ii->i_state)) { + /* Because this routine may race with nilfs_dispose_list(), + we have to check NILFS_I_QUEUED here, too. */ + if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) { + /* This will happen when somebody is freeing + this inode. */ + nilfs_warning(sbi->s_super, __func__, + "cannot get inode (ino=%lu)\n", + inode->i_ino); + spin_unlock(&sbi->s_inode_lock); + return -EINVAL; /* NILFS_I_DIRTY may remain for + freeing inode */ + } + list_del(&ii->i_dirty); + list_add_tail(&ii->i_dirty, &sbi->s_dirty_files); + set_bit(NILFS_I_QUEUED, &ii->i_state); + } + spin_unlock(&sbi->s_inode_lock); + return 0; +} + +int nilfs_mark_inode_dirty(struct inode *inode) +{ + struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb); + struct buffer_head *ibh; + int err; + + err = nilfs_load_inode_block(sbi, inode, &ibh); + if (unlikely(err)) { + nilfs_warning(inode->i_sb, __func__, + "failed to reget inode block.\n"); + return err; + } + lock_buffer(ibh); + nilfs_update_inode(inode, ibh); + unlock_buffer(ibh); + nilfs_mdt_mark_buffer_dirty(ibh); + nilfs_mdt_mark_dirty(sbi->s_ifile); + brelse(ibh); + return 0; +} + +/** + * nilfs_dirty_inode - reflect changes on given inode to an inode block. + * @inode: inode of the file to be registered. + * + * nilfs_dirty_inode() loads a inode block containing the specified + * @inode and copies data from a nilfs_inode to a corresponding inode + * entry in the inode block. This operation is excluded from the segment + * construction. This function can be called both as a single operation + * and as a part of indivisible file operations. + */ +void nilfs_dirty_inode(struct inode *inode) +{ + struct nilfs_transaction_info ti; + + if (is_bad_inode(inode)) { + nilfs_warning(inode->i_sb, __func__, + "tried to mark bad_inode dirty. ignored.\n"); + dump_stack(); + return; + } + nilfs_transaction_begin(inode->i_sb, &ti, 0); + if (likely(inode->i_ino != NILFS_SKETCH_INO)) + nilfs_mark_inode_dirty(inode); + nilfs_transaction_end(inode->i_sb, 1); /* never fails */ +} |