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f5974c8f8c
Add omitted comments for different structures in driver implementation. Signed-off-by: Vyacheslav Dubeyko <slava@dubeyko.com> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1073 lines
28 KiB
C
1073 lines
28 KiB
C
/*
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* inode.c - NILFS inode operations.
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*
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* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Written by Ryusuke Konishi <ryusuke@osrg.net>
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*
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*/
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#include <linux/buffer_head.h>
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#include <linux/gfp.h>
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#include <linux/mpage.h>
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#include <linux/writeback.h>
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#include <linux/uio.h>
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#include "nilfs.h"
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#include "btnode.h"
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#include "segment.h"
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#include "page.h"
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#include "mdt.h"
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#include "cpfile.h"
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#include "ifile.h"
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/**
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* struct nilfs_iget_args - arguments used during comparison between inodes
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* @ino: inode number
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* @cno: checkpoint number
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* @root: pointer on NILFS root object (mounted checkpoint)
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* @for_gc: inode for GC flag
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*/
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struct nilfs_iget_args {
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u64 ino;
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__u64 cno;
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struct nilfs_root *root;
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int for_gc;
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};
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void nilfs_inode_add_blocks(struct inode *inode, int n)
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{
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struct nilfs_root *root = NILFS_I(inode)->i_root;
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inode_add_bytes(inode, (1 << inode->i_blkbits) * n);
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if (root)
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atomic_add(n, &root->blocks_count);
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}
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void nilfs_inode_sub_blocks(struct inode *inode, int n)
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{
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struct nilfs_root *root = NILFS_I(inode)->i_root;
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inode_sub_bytes(inode, (1 << inode->i_blkbits) * n);
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if (root)
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atomic_sub(n, &root->blocks_count);
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}
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/**
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* nilfs_get_block() - get a file block on the filesystem (callback function)
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* @inode - inode struct of the target file
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* @blkoff - file block number
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* @bh_result - buffer head to be mapped on
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* @create - indicate whether allocating the block or not when it has not
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* been allocated yet.
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*
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* This function does not issue actual read request of the specified data
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* block. It is done by VFS.
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*/
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int nilfs_get_block(struct inode *inode, sector_t blkoff,
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struct buffer_head *bh_result, int create)
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{
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struct nilfs_inode_info *ii = NILFS_I(inode);
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struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
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__u64 blknum = 0;
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int err = 0, ret;
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unsigned maxblocks = bh_result->b_size >> inode->i_blkbits;
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down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
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ret = nilfs_bmap_lookup_contig(ii->i_bmap, blkoff, &blknum, maxblocks);
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up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
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if (ret >= 0) { /* found */
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map_bh(bh_result, inode->i_sb, blknum);
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if (ret > 0)
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bh_result->b_size = (ret << inode->i_blkbits);
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goto out;
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}
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/* data block was not found */
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if (ret == -ENOENT && create) {
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struct nilfs_transaction_info ti;
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bh_result->b_blocknr = 0;
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err = nilfs_transaction_begin(inode->i_sb, &ti, 1);
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if (unlikely(err))
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goto out;
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err = nilfs_bmap_insert(ii->i_bmap, (unsigned long)blkoff,
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(unsigned long)bh_result);
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if (unlikely(err != 0)) {
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if (err == -EEXIST) {
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/*
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* The get_block() function could be called
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* from multiple callers for an inode.
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* However, the page having this block must
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* be locked in this case.
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*/
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printk(KERN_WARNING
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"nilfs_get_block: a race condition "
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"while inserting a data block. "
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"(inode number=%lu, file block "
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"offset=%llu)\n",
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inode->i_ino,
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(unsigned long long)blkoff);
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err = 0;
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}
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nilfs_transaction_abort(inode->i_sb);
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goto out;
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}
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nilfs_mark_inode_dirty(inode);
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nilfs_transaction_commit(inode->i_sb); /* never fails */
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/* Error handling should be detailed */
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set_buffer_new(bh_result);
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set_buffer_delay(bh_result);
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map_bh(bh_result, inode->i_sb, 0); /* dbn must be changed
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to proper value */
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} else if (ret == -ENOENT) {
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/* not found is not error (e.g. hole); must return without
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the mapped state flag. */
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;
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} else {
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err = ret;
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}
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out:
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return err;
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}
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/**
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* nilfs_readpage() - implement readpage() method of nilfs_aops {}
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* address_space_operations.
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* @file - file struct of the file to be read
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* @page - the page to be read
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*/
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static int nilfs_readpage(struct file *file, struct page *page)
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{
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return mpage_readpage(page, nilfs_get_block);
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}
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/**
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* nilfs_readpages() - implement readpages() method of nilfs_aops {}
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* address_space_operations.
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* @file - file struct of the file to be read
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* @mapping - address_space struct used for reading multiple pages
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* @pages - the pages to be read
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* @nr_pages - number of pages to be read
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*/
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static int nilfs_readpages(struct file *file, struct address_space *mapping,
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struct list_head *pages, unsigned nr_pages)
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{
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return mpage_readpages(mapping, pages, nr_pages, nilfs_get_block);
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}
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static int nilfs_writepages(struct address_space *mapping,
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struct writeback_control *wbc)
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{
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struct inode *inode = mapping->host;
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int err = 0;
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if (wbc->sync_mode == WB_SYNC_ALL)
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err = nilfs_construct_dsync_segment(inode->i_sb, inode,
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wbc->range_start,
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wbc->range_end);
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return err;
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}
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static int nilfs_writepage(struct page *page, struct writeback_control *wbc)
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{
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struct inode *inode = page->mapping->host;
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int err;
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redirty_page_for_writepage(wbc, page);
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unlock_page(page);
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if (wbc->sync_mode == WB_SYNC_ALL) {
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err = nilfs_construct_segment(inode->i_sb);
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if (unlikely(err))
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return err;
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} else if (wbc->for_reclaim)
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nilfs_flush_segment(inode->i_sb, inode->i_ino);
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return 0;
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}
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static int nilfs_set_page_dirty(struct page *page)
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{
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int ret = __set_page_dirty_buffers(page);
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if (ret) {
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struct inode *inode = page->mapping->host;
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unsigned nr_dirty = 1 << (PAGE_SHIFT - inode->i_blkbits);
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nilfs_set_file_dirty(inode, nr_dirty);
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}
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return ret;
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}
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static int nilfs_write_begin(struct file *file, struct address_space *mapping,
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loff_t pos, unsigned len, unsigned flags,
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struct page **pagep, void **fsdata)
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{
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struct inode *inode = mapping->host;
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int err = nilfs_transaction_begin(inode->i_sb, NULL, 1);
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if (unlikely(err))
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return err;
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err = block_write_begin(mapping, pos, len, flags, pagep,
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nilfs_get_block);
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if (unlikely(err)) {
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loff_t isize = mapping->host->i_size;
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if (pos + len > isize)
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vmtruncate(mapping->host, isize);
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nilfs_transaction_abort(inode->i_sb);
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}
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return err;
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}
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static int nilfs_write_end(struct file *file, struct address_space *mapping,
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loff_t pos, unsigned len, unsigned copied,
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struct page *page, void *fsdata)
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{
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struct inode *inode = mapping->host;
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unsigned start = pos & (PAGE_CACHE_SIZE - 1);
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unsigned nr_dirty;
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int err;
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nr_dirty = nilfs_page_count_clean_buffers(page, start,
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start + copied);
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copied = generic_write_end(file, mapping, pos, len, copied, page,
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fsdata);
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nilfs_set_file_dirty(inode, nr_dirty);
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err = nilfs_transaction_commit(inode->i_sb);
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return err ? : copied;
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}
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static ssize_t
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nilfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
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loff_t offset, unsigned long nr_segs)
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{
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struct file *file = iocb->ki_filp;
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struct inode *inode = file->f_mapping->host;
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ssize_t size;
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if (rw == WRITE)
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return 0;
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/* Needs synchronization with the cleaner */
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size = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
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nilfs_get_block);
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/*
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* In case of error extending write may have instantiated a few
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* blocks outside i_size. Trim these off again.
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*/
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if (unlikely((rw & WRITE) && size < 0)) {
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loff_t isize = i_size_read(inode);
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loff_t end = offset + iov_length(iov, nr_segs);
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if (end > isize)
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vmtruncate(inode, isize);
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}
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return size;
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}
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const struct address_space_operations nilfs_aops = {
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.writepage = nilfs_writepage,
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.readpage = nilfs_readpage,
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.writepages = nilfs_writepages,
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.set_page_dirty = nilfs_set_page_dirty,
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.readpages = nilfs_readpages,
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.write_begin = nilfs_write_begin,
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.write_end = nilfs_write_end,
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/* .releasepage = nilfs_releasepage, */
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.invalidatepage = block_invalidatepage,
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.direct_IO = nilfs_direct_IO,
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.is_partially_uptodate = block_is_partially_uptodate,
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};
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struct inode *nilfs_new_inode(struct inode *dir, umode_t mode)
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{
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struct super_block *sb = dir->i_sb;
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struct the_nilfs *nilfs = sb->s_fs_info;
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struct inode *inode;
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struct nilfs_inode_info *ii;
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struct nilfs_root *root;
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int err = -ENOMEM;
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ino_t ino;
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inode = new_inode(sb);
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if (unlikely(!inode))
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goto failed;
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mapping_set_gfp_mask(inode->i_mapping,
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mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS);
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root = NILFS_I(dir)->i_root;
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ii = NILFS_I(inode);
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ii->i_state = 1 << NILFS_I_NEW;
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ii->i_root = root;
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err = nilfs_ifile_create_inode(root->ifile, &ino, &ii->i_bh);
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if (unlikely(err))
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goto failed_ifile_create_inode;
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/* reference count of i_bh inherits from nilfs_mdt_read_block() */
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atomic_inc(&root->inodes_count);
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inode_init_owner(inode, dir, mode);
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inode->i_ino = ino;
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inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
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if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
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err = nilfs_bmap_read(ii->i_bmap, NULL);
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if (err < 0)
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goto failed_bmap;
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set_bit(NILFS_I_BMAP, &ii->i_state);
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/* No lock is needed; iget() ensures it. */
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}
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ii->i_flags = nilfs_mask_flags(
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mode, NILFS_I(dir)->i_flags & NILFS_FL_INHERITED);
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/* ii->i_file_acl = 0; */
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/* ii->i_dir_acl = 0; */
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ii->i_dir_start_lookup = 0;
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nilfs_set_inode_flags(inode);
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spin_lock(&nilfs->ns_next_gen_lock);
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inode->i_generation = nilfs->ns_next_generation++;
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spin_unlock(&nilfs->ns_next_gen_lock);
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insert_inode_hash(inode);
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err = nilfs_init_acl(inode, dir);
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if (unlikely(err))
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goto failed_acl; /* never occur. When supporting
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nilfs_init_acl(), proper cancellation of
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above jobs should be considered */
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return inode;
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failed_acl:
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failed_bmap:
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clear_nlink(inode);
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iput(inode); /* raw_inode will be deleted through
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generic_delete_inode() */
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goto failed;
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failed_ifile_create_inode:
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make_bad_inode(inode);
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iput(inode); /* if i_nlink == 1, generic_forget_inode() will be
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called */
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failed:
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return ERR_PTR(err);
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}
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void nilfs_set_inode_flags(struct inode *inode)
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{
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unsigned int flags = NILFS_I(inode)->i_flags;
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inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME |
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S_DIRSYNC);
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if (flags & FS_SYNC_FL)
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inode->i_flags |= S_SYNC;
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if (flags & FS_APPEND_FL)
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inode->i_flags |= S_APPEND;
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if (flags & FS_IMMUTABLE_FL)
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inode->i_flags |= S_IMMUTABLE;
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if (flags & FS_NOATIME_FL)
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inode->i_flags |= S_NOATIME;
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if (flags & FS_DIRSYNC_FL)
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inode->i_flags |= S_DIRSYNC;
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mapping_set_gfp_mask(inode->i_mapping,
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mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS);
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}
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|
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int nilfs_read_inode_common(struct inode *inode,
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struct nilfs_inode *raw_inode)
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{
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struct nilfs_inode_info *ii = NILFS_I(inode);
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int err;
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|
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inode->i_mode = le16_to_cpu(raw_inode->i_mode);
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inode->i_uid = (uid_t)le32_to_cpu(raw_inode->i_uid);
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inode->i_gid = (gid_t)le32_to_cpu(raw_inode->i_gid);
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set_nlink(inode, le16_to_cpu(raw_inode->i_links_count));
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inode->i_size = le64_to_cpu(raw_inode->i_size);
|
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inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
|
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inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime);
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inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime);
|
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inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
|
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inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec);
|
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inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec);
|
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if (inode->i_nlink == 0 && inode->i_mode == 0)
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return -EINVAL; /* this inode is deleted */
|
|
|
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inode->i_blocks = le64_to_cpu(raw_inode->i_blocks);
|
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ii->i_flags = le32_to_cpu(raw_inode->i_flags);
|
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#if 0
|
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ii->i_file_acl = le32_to_cpu(raw_inode->i_file_acl);
|
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ii->i_dir_acl = S_ISREG(inode->i_mode) ?
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0 : le32_to_cpu(raw_inode->i_dir_acl);
|
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#endif
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ii->i_dir_start_lookup = 0;
|
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inode->i_generation = le32_to_cpu(raw_inode->i_generation);
|
|
|
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if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
|
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S_ISLNK(inode->i_mode)) {
|
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err = nilfs_bmap_read(ii->i_bmap, raw_inode);
|
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if (err < 0)
|
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return err;
|
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set_bit(NILFS_I_BMAP, &ii->i_state);
|
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/* No lock is needed; iget() ensures it. */
|
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}
|
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return 0;
|
|
}
|
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|
|
static int __nilfs_read_inode(struct super_block *sb,
|
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struct nilfs_root *root, unsigned long ino,
|
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struct inode *inode)
|
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{
|
|
struct the_nilfs *nilfs = sb->s_fs_info;
|
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struct buffer_head *bh;
|
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struct nilfs_inode *raw_inode;
|
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int err;
|
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|
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down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
|
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err = nilfs_ifile_get_inode_block(root->ifile, ino, &bh);
|
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if (unlikely(err))
|
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goto bad_inode;
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|
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raw_inode = nilfs_ifile_map_inode(root->ifile, ino, bh);
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|
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err = nilfs_read_inode_common(inode, raw_inode);
|
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if (err)
|
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goto failed_unmap;
|
|
|
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if (S_ISREG(inode->i_mode)) {
|
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inode->i_op = &nilfs_file_inode_operations;
|
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inode->i_fop = &nilfs_file_operations;
|
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inode->i_mapping->a_ops = &nilfs_aops;
|
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} else if (S_ISDIR(inode->i_mode)) {
|
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inode->i_op = &nilfs_dir_inode_operations;
|
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inode->i_fop = &nilfs_dir_operations;
|
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inode->i_mapping->a_ops = &nilfs_aops;
|
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} else if (S_ISLNK(inode->i_mode)) {
|
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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,
|
|
huge_decode_dev(le64_to_cpu(raw_inode->i_device_code)));
|
|
}
|
|
nilfs_ifile_unmap_inode(root->ifile, ino, bh);
|
|
brelse(bh);
|
|
up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
|
|
nilfs_set_inode_flags(inode);
|
|
return 0;
|
|
|
|
failed_unmap:
|
|
nilfs_ifile_unmap_inode(root->ifile, ino, bh);
|
|
brelse(bh);
|
|
|
|
bad_inode:
|
|
up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
|
|
return err;
|
|
}
|
|
|
|
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 || args->root != NILFS_I(inode)->i_root)
|
|
return 0;
|
|
|
|
ii = NILFS_I(inode);
|
|
if (!test_bit(NILFS_I_GCINODE, &ii->i_state))
|
|
return !args->for_gc;
|
|
|
|
return args->for_gc && args->cno == ii->i_cno;
|
|
}
|
|
|
|
static int nilfs_iget_set(struct inode *inode, void *opaque)
|
|
{
|
|
struct nilfs_iget_args *args = opaque;
|
|
|
|
inode->i_ino = args->ino;
|
|
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_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. */
|
|
}
|
|
|
|
static void nilfs_clear_inode(struct inode *inode)
|
|
{
|
|
struct nilfs_inode_info *ii = NILFS_I(inode);
|
|
struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
|
|
|
|
/*
|
|
* Free resources allocated in nilfs_read_inode(), here.
|
|
*/
|
|
BUG_ON(!list_empty(&ii->i_dirty));
|
|
brelse(ii->i_bh);
|
|
ii->i_bh = NULL;
|
|
|
|
if (mdi && mdi->mi_palloc_cache)
|
|
nilfs_palloc_destroy_cache(inode);
|
|
|
|
if (test_bit(NILFS_I_BMAP, &ii->i_state))
|
|
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)
|
|
{
|
|
struct nilfs_transaction_info ti;
|
|
struct super_block *sb = inode->i_sb;
|
|
struct nilfs_inode_info *ii = NILFS_I(inode);
|
|
int ret;
|
|
|
|
if (inode->i_nlink || !ii->i_root || unlikely(is_bad_inode(inode))) {
|
|
if (inode->i_data.nrpages)
|
|
truncate_inode_pages(&inode->i_data, 0);
|
|
clear_inode(inode);
|
|
nilfs_clear_inode(inode);
|
|
return;
|
|
}
|
|
nilfs_transaction_begin(sb, &ti, 0); /* never fails */
|
|
|
|
if (inode->i_data.nrpages)
|
|
truncate_inode_pages(&inode->i_data, 0);
|
|
|
|
/* TODO: some of the following operations may fail. */
|
|
nilfs_truncate_bmap(ii, 0);
|
|
nilfs_mark_inode_dirty(inode);
|
|
clear_inode(inode);
|
|
|
|
ret = nilfs_ifile_delete_inode(ii->i_root->ifile, inode->i_ino);
|
|
if (!ret)
|
|
atomic_dec(&ii->i_root->inodes_count);
|
|
|
|
nilfs_clear_inode(inode);
|
|
|
|
if (IS_SYNC(inode))
|
|
nilfs_set_transaction_flag(NILFS_TI_SYNC);
|
|
nilfs_transaction_commit(sb);
|
|
/* 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;
|
|
|
|
err = inode_change_ok(inode, iattr);
|
|
if (err)
|
|
return err;
|
|
|
|
err = nilfs_transaction_begin(sb, &ti, 0);
|
|
if (unlikely(err))
|
|
return err;
|
|
|
|
if ((iattr->ia_valid & ATTR_SIZE) &&
|
|
iattr->ia_size != i_size_read(inode)) {
|
|
inode_dio_wait(inode);
|
|
|
|
err = vmtruncate(inode, iattr->ia_size);
|
|
if (unlikely(err))
|
|
goto out_err;
|
|
}
|
|
|
|
setattr_copy(inode, iattr);
|
|
mark_inode_dirty(inode);
|
|
|
|
if (iattr->ia_valid & ATTR_MODE) {
|
|
err = nilfs_acl_chmod(inode);
|
|
if (unlikely(err))
|
|
goto out_err;
|
|
}
|
|
|
|
return nilfs_transaction_commit(sb);
|
|
|
|
out_err:
|
|
nilfs_transaction_abort(sb);
|
|
return err;
|
|
}
|
|
|
|
int nilfs_permission(struct inode *inode, int mask)
|
|
{
|
|
struct nilfs_root *root = NILFS_I(inode)->i_root;
|
|
if ((mask & MAY_WRITE) && root &&
|
|
root->cno != NILFS_CPTREE_CURRENT_CNO)
|
|
return -EROFS; /* snapshot is not writable */
|
|
|
|
return generic_permission(inode, mask);
|
|
}
|
|
|
|
int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh)
|
|
{
|
|
struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
|
|
struct nilfs_inode_info *ii = NILFS_I(inode);
|
|
int err;
|
|
|
|
spin_lock(&nilfs->ns_inode_lock);
|
|
if (ii->i_bh == NULL) {
|
|
spin_unlock(&nilfs->ns_inode_lock);
|
|
err = nilfs_ifile_get_inode_block(ii->i_root->ifile,
|
|
inode->i_ino, pbh);
|
|
if (unlikely(err))
|
|
return err;
|
|
spin_lock(&nilfs->ns_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(&nilfs->ns_inode_lock);
|
|
return 0;
|
|
}
|
|
|
|
int nilfs_inode_dirty(struct inode *inode)
|
|
{
|
|
struct nilfs_inode_info *ii = NILFS_I(inode);
|
|
struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
|
|
int ret = 0;
|
|
|
|
if (!list_empty(&ii->i_dirty)) {
|
|
spin_lock(&nilfs->ns_inode_lock);
|
|
ret = test_bit(NILFS_I_DIRTY, &ii->i_state) ||
|
|
test_bit(NILFS_I_BUSY, &ii->i_state);
|
|
spin_unlock(&nilfs->ns_inode_lock);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int nilfs_set_file_dirty(struct inode *inode, unsigned nr_dirty)
|
|
{
|
|
struct nilfs_inode_info *ii = NILFS_I(inode);
|
|
struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
|
|
|
|
atomic_add(nr_dirty, &nilfs->ns_ndirtyblks);
|
|
|
|
if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state))
|
|
return 0;
|
|
|
|
spin_lock(&nilfs->ns_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(inode->i_sb, __func__,
|
|
"cannot get inode (ino=%lu)\n",
|
|
inode->i_ino);
|
|
spin_unlock(&nilfs->ns_inode_lock);
|
|
return -EINVAL; /* NILFS_I_DIRTY may remain for
|
|
freeing inode */
|
|
}
|
|
list_move_tail(&ii->i_dirty, &nilfs->ns_dirty_files);
|
|
set_bit(NILFS_I_QUEUED, &ii->i_state);
|
|
}
|
|
spin_unlock(&nilfs->ns_inode_lock);
|
|
return 0;
|
|
}
|
|
|
|
int nilfs_mark_inode_dirty(struct inode *inode)
|
|
{
|
|
struct buffer_head *ibh;
|
|
int err;
|
|
|
|
err = nilfs_load_inode_block(inode, &ibh);
|
|
if (unlikely(err)) {
|
|
nilfs_warning(inode->i_sb, __func__,
|
|
"failed to reget inode block.\n");
|
|
return err;
|
|
}
|
|
nilfs_update_inode(inode, ibh);
|
|
mark_buffer_dirty(ibh);
|
|
nilfs_mdt_mark_dirty(NILFS_I(inode)->i_root->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, int flags)
|
|
{
|
|
struct nilfs_transaction_info ti;
|
|
struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
|
|
|
|
if (is_bad_inode(inode)) {
|
|
nilfs_warning(inode->i_sb, __func__,
|
|
"tried to mark bad_inode dirty. ignored.\n");
|
|
dump_stack();
|
|
return;
|
|
}
|
|
if (mdi) {
|
|
nilfs_mdt_mark_dirty(inode);
|
|
return;
|
|
}
|
|
nilfs_transaction_begin(inode->i_sb, &ti, 0);
|
|
nilfs_mark_inode_dirty(inode);
|
|
nilfs_transaction_commit(inode->i_sb); /* never fails */
|
|
}
|
|
|
|
int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
|
|
__u64 start, __u64 len)
|
|
{
|
|
struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
|
|
__u64 logical = 0, phys = 0, size = 0;
|
|
__u32 flags = 0;
|
|
loff_t isize;
|
|
sector_t blkoff, end_blkoff;
|
|
sector_t delalloc_blkoff;
|
|
unsigned long delalloc_blklen;
|
|
unsigned int blkbits = inode->i_blkbits;
|
|
int ret, n;
|
|
|
|
ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
|
|
if (ret)
|
|
return ret;
|
|
|
|
mutex_lock(&inode->i_mutex);
|
|
|
|
isize = i_size_read(inode);
|
|
|
|
blkoff = start >> blkbits;
|
|
end_blkoff = (start + len - 1) >> blkbits;
|
|
|
|
delalloc_blklen = nilfs_find_uncommitted_extent(inode, blkoff,
|
|
&delalloc_blkoff);
|
|
|
|
do {
|
|
__u64 blkphy;
|
|
unsigned int maxblocks;
|
|
|
|
if (delalloc_blklen && blkoff == delalloc_blkoff) {
|
|
if (size) {
|
|
/* End of the current extent */
|
|
ret = fiemap_fill_next_extent(
|
|
fieinfo, logical, phys, size, flags);
|
|
if (ret)
|
|
break;
|
|
}
|
|
if (blkoff > end_blkoff)
|
|
break;
|
|
|
|
flags = FIEMAP_EXTENT_MERGED | FIEMAP_EXTENT_DELALLOC;
|
|
logical = blkoff << blkbits;
|
|
phys = 0;
|
|
size = delalloc_blklen << blkbits;
|
|
|
|
blkoff = delalloc_blkoff + delalloc_blklen;
|
|
delalloc_blklen = nilfs_find_uncommitted_extent(
|
|
inode, blkoff, &delalloc_blkoff);
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* Limit the number of blocks that we look up so as
|
|
* not to get into the next delayed allocation extent.
|
|
*/
|
|
maxblocks = INT_MAX;
|
|
if (delalloc_blklen)
|
|
maxblocks = min_t(sector_t, delalloc_blkoff - blkoff,
|
|
maxblocks);
|
|
blkphy = 0;
|
|
|
|
down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
|
|
n = nilfs_bmap_lookup_contig(
|
|
NILFS_I(inode)->i_bmap, blkoff, &blkphy, maxblocks);
|
|
up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
|
|
|
|
if (n < 0) {
|
|
int past_eof;
|
|
|
|
if (unlikely(n != -ENOENT))
|
|
break; /* error */
|
|
|
|
/* HOLE */
|
|
blkoff++;
|
|
past_eof = ((blkoff << blkbits) >= isize);
|
|
|
|
if (size) {
|
|
/* End of the current extent */
|
|
|
|
if (past_eof)
|
|
flags |= FIEMAP_EXTENT_LAST;
|
|
|
|
ret = fiemap_fill_next_extent(
|
|
fieinfo, logical, phys, size, flags);
|
|
if (ret)
|
|
break;
|
|
size = 0;
|
|
}
|
|
if (blkoff > end_blkoff || past_eof)
|
|
break;
|
|
} else {
|
|
if (size) {
|
|
if (phys && blkphy << blkbits == phys + size) {
|
|
/* The current extent goes on */
|
|
size += n << blkbits;
|
|
} else {
|
|
/* Terminate the current extent */
|
|
ret = fiemap_fill_next_extent(
|
|
fieinfo, logical, phys, size,
|
|
flags);
|
|
if (ret || blkoff > end_blkoff)
|
|
break;
|
|
|
|
/* Start another extent */
|
|
flags = FIEMAP_EXTENT_MERGED;
|
|
logical = blkoff << blkbits;
|
|
phys = blkphy << blkbits;
|
|
size = n << blkbits;
|
|
}
|
|
} else {
|
|
/* Start a new extent */
|
|
flags = FIEMAP_EXTENT_MERGED;
|
|
logical = blkoff << blkbits;
|
|
phys = blkphy << blkbits;
|
|
size = n << blkbits;
|
|
}
|
|
blkoff += n;
|
|
}
|
|
cond_resched();
|
|
} while (true);
|
|
|
|
/* If ret is 1 then we just hit the end of the extent array */
|
|
if (ret == 1)
|
|
ret = 0;
|
|
|
|
mutex_unlock(&inode->i_mutex);
|
|
return ret;
|
|
}
|