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Subject[PATCH 15/27] nilfs2: inode operations
Date
This adds inode level operations of the nilfs2 file system.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
---
fs/nilfs2/inode.c | 819 +++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 819 insertions(+), 0 deletions(-)
create mode 100644 fs/nilfs2/inode.c
diff --git a/fs/nilfs2/inode.c b/fs/nilfs2/inode.c
new file mode 100644
index 0000000..4a526bc
--- /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 */
+}
--
1.5.6.3


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