Release 4.11 fs/jfs/inode.c

/*
 *   Copyright (C) International Business Machines Corp., 2000-2004
 *   Portions Copyright (C) Christoph Hellwig, 2001-2002
 *
 *   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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <linux/fs.h>
#include <linux/mpage.h>
#include <linux/buffer_head.h>
#include <linux/pagemap.h>
#include <linux/quotaops.h>
#include <linux/uio.h>
#include <linux/writeback.h>
#include "jfs_incore.h"
#include "jfs_inode.h"
#include "jfs_filsys.h"
#include "jfs_imap.h"
#include "jfs_extent.h"
#include "jfs_unicode.h"
#include "jfs_debug.h"




struct inode *jfs_iget(struct super_block *sb, unsigned long ino)
{
	struct inode *inode;
	int ret;

	inode = iget_locked(sb, ino);
	if (!inode)
		return ERR_PTR(-ENOMEM);
	if (!(inode->i_state & I_NEW))
		return inode;

	ret = diRead(inode);
	if (ret < 0) {
		iget_failed(inode);
		return ERR_PTR(ret);
	}

	if (S_ISREG(inode->i_mode)) {
		inode->i_op = &jfs_file_inode_operations;
		inode->i_fop = &jfs_file_operations;
		inode->i_mapping->a_ops = &jfs_aops;
	} else if (S_ISDIR(inode->i_mode)) {
		inode->i_op = &jfs_dir_inode_operations;
		inode->i_fop = &jfs_dir_operations;
	} else if (S_ISLNK(inode->i_mode)) {
		if (inode->i_size >= IDATASIZE) {
			inode->i_op = &page_symlink_inode_operations;
			inode_nohighmem(inode);
			inode->i_mapping->a_ops = &jfs_aops;
		} else {
			inode->i_op = &jfs_fast_symlink_inode_operations;
			inode->i_link = JFS_IP(inode)->i_inline;
			/*
                         * The inline data should be null-terminated, but
                         * don't let on-disk corruption crash the kernel
                         */
			inode->i_link[inode->i_size] = '\0';
		}
	} else {
		inode->i_op = &jfs_file_inode_operations;
		init_special_inode(inode, inode->i_mode, inode->i_rdev);
	}
	unlock_new_inode(inode);
	return inode;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dave Kleikamp
162
64.29%
6
54.55%
David Howells
74
29.37%
1
9.09%
Al Viro
14
5.56%
2
18.18%
Christoph Hellwig
1
0.40%
1
9.09%
Dmitriy Monakhov
1
0.40%
1
9.09%
Total
252
100.00%
11
100.00%

/*
 * Workhorse of both fsync & write_inode
 */


int jfs_commit_inode(struct inode *inode, int wait)
{
	int rc = 0;
	tid_t tid;
	static int noisy = 5;

	jfs_info("In jfs_commit_inode, inode = 0x%p", inode);

	/*
         * Don't commit if inode has been committed since last being
         * marked dirty, or if it has been deleted.
         */
	if (inode->i_nlink == 0 || !test_cflag(COMMIT_Dirty, inode))
		return 0;

	if (isReadOnly(inode)) {
		/* kernel allows writes to devices on read-only
                 * partitions and may think inode is dirty
                 */
		if (!special_file(inode->i_mode) && noisy) {
			jfs_err("jfs_commit_inode(0x%p) called on read-only volume",
				inode);
			jfs_err("Is remount racy?");
			noisy--;
		}
		return 0;
	}

	tid = txBegin(inode->i_sb, COMMIT_INODE);
	mutex_lock(&JFS_IP(inode)->commit_mutex);

	/*
         * Retest inode state after taking commit_mutex
         */
	if (inode->i_nlink && test_cflag(COMMIT_Dirty, inode))
		rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0);

	txEnd(tid);
	mutex_unlock(&JFS_IP(inode)->commit_mutex);
	return rc;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dave Kleikamp
163
96.45%
4
66.67%
Ingo Molnar
5
2.96%
1
16.67%
Joe Perches
1
0.59%
1
16.67%
Total
169
100.00%
6
100.00%



int jfs_write_inode(struct inode *inode, struct writeback_control *wbc)
{
	int wait = wbc->sync_mode == WB_SYNC_ALL;

	if (inode->i_nlink == 0)
		return 0;
	/*
         * If COMMIT_DIRTY is not set, the inode isn't really dirty.
         * It has been committed since the last change, but was still
         * on the dirty inode list.
         */
	if (!test_cflag(COMMIT_Dirty, inode)) {
		/* Make sure committed changes hit the disk */
		jfs_flush_journal(JFS_SBI(inode->i_sb)->log, wait);
		return 0;
	}

	if (jfs_commit_inode(inode, wait)) {
		jfs_err("jfs_write_inode: jfs_commit_inode failed!");
		return -EIO;
	} else
		return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dave Kleikamp
62
68.89%
4
66.67%
Andrey V. Savochkin
15
16.67%
1
16.67%
Christoph Hellwig
13
14.44%
1
16.67%
Total
90
100.00%
6
100.00%



void jfs_evict_inode(struct inode *inode)
{
	jfs_info("In jfs_evict_inode, inode = 0x%p", inode);

	if (!inode->i_nlink && !is_bad_inode(inode)) {
		dquot_initialize(inode);

		if (JFS_IP(inode)->fileset == FILESYSTEM_I) {
			truncate_inode_pages_final(&inode->i_data);

			if (test_cflag(COMMIT_Freewmap, inode))
				jfs_free_zero_link(inode);

			diFree(inode);

			/*
                         * Free the inode from the quota allocation.
                         */
			dquot_initialize(inode);
			dquot_free_inode(inode);
		}
	} else {
		truncate_inode_pages_final(&inode->i_data);
	}
	clear_inode(inode);
	dquot_drop(inode);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dave Kleikamp
68
62.39%
6
46.15%
Al Viro
21
19.27%
1
7.69%
Christoph Hellwig
10
9.17%
3
23.08%
Mark Fasheh
7
6.42%
1
7.69%
Johannes Weiner
2
1.83%
1
7.69%
Jan Kara
1
0.92%
1
7.69%
Total
109
100.00%
13
100.00%



void jfs_dirty_inode(struct inode *inode, int flags)
{
	static int noisy = 5;

	if (isReadOnly(inode)) {
		if (!special_file(inode->i_mode) && noisy) {
			/* kernel allows writes to devices on read-only
                         * partitions and may try to mark inode dirty
                         */
			jfs_err("jfs_dirty_inode called on read-only volume");
			jfs_err("Is remount racy?");
			noisy--;
		}
		return;
	}

	set_cflag(COMMIT_Dirty, inode);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dave Kleikamp
61
95.31%
2
66.67%
Christoph Hellwig
3
4.69%
1
33.33%
Total
64
100.00%
3
100.00%



int jfs_get_block(struct inode *ip, sector_t lblock,
		  struct buffer_head *bh_result, int create)
{
	s64 lblock64 = lblock;
	int rc = 0;
	xad_t xad;
	s64 xaddr;
	int xflag;
	s32 xlen = bh_result->b_size >> ip->i_blkbits;

	/*
         * Take appropriate lock on inode
         */
	if (create)
		IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
	else
		IREAD_LOCK(ip, RDWRLOCK_NORMAL);

	if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) &&
	    (!xtLookup(ip, lblock64, xlen, &xflag, &xaddr, &xlen, 0)) &&
	    xaddr) {
		if (xflag & XAD_NOTRECORDED) {
			if (!create)
				/*
                                 * Allocated but not recorded, read treats
                                 * this as a hole
                                 */
				goto unlock;
#ifdef _JFS_4K
			XADoffset(&xad, lblock64);
			XADlength(&xad, xlen);
			XADaddress(&xad, xaddr);
#else				/* _JFS_4K */
			/*
                         * As long as block size = 4K, this isn't a problem.
                         * We should mark the whole page not ABNR, but how
                         * will we know to mark the other blocks BH_New?
                         */
			BUG();
#endif				/* _JFS_4K */
			rc = extRecord(ip, &xad);
			if (rc)
				goto unlock;
			set_buffer_new(bh_result);
		}

		map_bh(bh_result, ip->i_sb, xaddr);
		bh_result->b_size = xlen << ip->i_blkbits;
		goto unlock;
	}
	if (!create)
		goto unlock;

	/*
         * Allocate a new block
         */
#ifdef _JFS_4K
	if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad)))
		goto unlock;
	rc = extAlloc(ip, xlen, lblock64, &xad, false);
	if (rc)
		goto unlock;

	set_buffer_new(bh_result);
	map_bh(bh_result, ip->i_sb, addressXAD(&xad));
	bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits;

#else				/* _JFS_4K */
	/*
         * We need to do whatever it takes to keep all but the last buffers
         * in 4K pages - see jfs_write.c
         */
	BUG();
#endif				/* _JFS_4K */

      unlock:
	/*
         * Release lock on inode
         */
	if (create)
		IWRITE_UNLOCK(ip);
	else
		IREAD_UNLOCK(ip);
	return rc;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dave Kleikamp
334
97.95%
7
77.78%
Andrew Morton
6
1.76%
1
11.11%
Richard Knutsson
1
0.29%
1
11.11%
Total
341
100.00%
9
100.00%



static int jfs_writepage(struct page *page, struct writeback_control *wbc)
{
	return block_write_full_page(page, jfs_get_block, wbc);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dave Kleikamp
18
69.23%
1
33.33%
Andrew Morton
7
26.92%
1
33.33%
Nicholas Piggin
1
3.85%
1
33.33%
Total
26
100.00%
3
100.00%



static int jfs_writepages(struct address_space *mapping,
			struct writeback_control *wbc)
{
	return mpage_writepages(mapping, wbc, jfs_get_block);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dave Kleikamp
22
84.62%
1
50.00%
Andrew Morton
4
15.38%
1
50.00%
Total
26
100.00%
2
100.00%



static int jfs_readpage(struct file *file, struct page *page)
{
	return mpage_readpage(page, jfs_get_block);
}

Contributors
Person
Tokens
Prop
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CommitProp
Dave Kleikamp
24
100.00%
2
100.00%
Total
24
100.00%
2
100.00%



static int jfs_readpages(struct file *file, struct address_space *mapping,
		struct list_head *pages, unsigned nr_pages)
{
	return mpage_readpages(mapping, pages, nr_pages, jfs_get_block);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dave Kleikamp
31
86.11%
1
50.00%
Trond Myklebust
5
13.89%
1
50.00%
Total
36
100.00%
2
100.00%



static void jfs_write_failed(struct address_space *mapping, loff_t to)
{
	struct inode *inode = mapping->host;

	if (to > inode->i_size) {
		truncate_pagecache(inode, inode->i_size);
		jfs_truncate(inode);
	}
}

Contributors
Person
Tokens
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CommitProp
Marco Stornelli
47
100.00%
1
100.00%
Total
47
100.00%
1
100.00%



static int jfs_write_begin(struct file *file, struct address_space *mapping,
				loff_t pos, unsigned len, unsigned flags,
				struct page **pagep, void **fsdata)
{
	int ret;

	ret = nobh_write_begin(mapping, pos, len, flags, pagep, fsdata,
				jfs_get_block);
	if (unlikely(ret))
		jfs_write_failed(mapping, pos + len);

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Nicholas Piggin
30
38.96%
2
40.00%
Dave Kleikamp
23
29.87%
1
20.00%
Christoph Hellwig
21
27.27%
1
20.00%
Marco Stornelli
3
3.90%
1
20.00%
Total
77
100.00%
5
100.00%



static sector_t jfs_bmap(struct address_space *mapping, sector_t block)
{
	return generic_block_bmap(mapping, block, jfs_get_block);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dave Kleikamp
22
91.67%
1
50.00%
Andrew Morton
2
8.33%
1
50.00%
Total
24
100.00%
2
100.00%



static ssize_t jfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
{
	struct file *file = iocb->ki_filp;
	struct address_space *mapping = file->f_mapping;
	struct inode *inode = file->f_mapping->host;
	size_t count = iov_iter_count(iter);
	ssize_t ret;

	ret = blockdev_direct_IO(iocb, inode, iter, jfs_get_block);

	/*
         * In case of error extending write may have instantiated a few
         * blocks outside i_size. Trim these off again.
         */
	if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) {
		loff_t isize = i_size_read(inode);
		loff_t end = iocb->ki_pos + count;

		if (end > isize)
			jfs_write_failed(mapping, end);
	}

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
48
39.67%
2
15.38%
Andrew Morton
17
14.05%
4
30.77%
Dave Kleikamp
16
13.22%
1
7.69%
Al Viro
12
9.92%
2
15.38%
Marco Stornelli
12
9.92%
1
7.69%
Chuck Lever
10
8.26%
1
7.69%
Omar Sandoval
5
4.13%
1
7.69%
Badari Pulavarty
1
0.83%
1
7.69%
Total
121
100.00%
13
100.00%


const struct address_space_operations jfs_aops = {
	.readpage	= jfs_readpage,
	.readpages	= jfs_readpages,
	.writepage	= jfs_writepage,
	.writepages	= jfs_writepages,
	.write_begin	= jfs_write_begin,
	.write_end	= nobh_write_end,
	.bmap		= jfs_bmap,
	.direct_IO	= jfs_direct_IO,
};

/*
 * Guts of jfs_truncate.  Called with locks already held.  Can be called
 * with directory for truncating directory index table.
 */


void jfs_truncate_nolock(struct inode *ip, loff_t length)
{
	loff_t newsize;
	tid_t tid;

	ASSERT(length >= 0);

	if (test_cflag(COMMIT_Nolink, ip)) {
		xtTruncate(0, ip, length, COMMIT_WMAP);
		return;
	}

	do {
		tid = txBegin(ip->i_sb, 0);

		/*
                 * The commit_mutex cannot be taken before txBegin.
                 * txBegin may block and there is a chance the inode
                 * could be marked dirty and need to be committed
                 * before txBegin unblocks
                 */
		mutex_lock(&JFS_IP(ip)->commit_mutex);

		newsize = xtTruncate(tid, ip, length,
				     COMMIT_TRUNCATE | COMMIT_PWMAP);
		if (newsize < 0) {
			txEnd(tid);
			mutex_unlock(&JFS_IP(ip)->commit_mutex);
			break;
		}

		ip->i_mtime = ip->i_ctime = current_time(ip);
		mark_inode_dirty(ip);

		txCommit(tid, 1, &ip, 0);
		txEnd(tid);
		mutex_unlock(&JFS_IP(ip)->commit_mutex);
	} while (newsize > length);	/* Truncate isn't always atomic */
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dave Kleikamp
158
93.49%
1
33.33%
Ingo Molnar
7
4.14%
1
33.33%
Deepa Dinamani
4
2.37%
1
33.33%
Total
169
100.00%
3
100.00%



void jfs_truncate(struct inode *ip)
{
	jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size);

	nobh_truncate_page(ip->i_mapping, ip->i_size, jfs_get_block);

	IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
	jfs_truncate_nolock(ip, ip->i_size);
	IWRITE_UNLOCK(ip);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Dave Kleikamp
53
94.64%
3
60.00%
Nicholas Piggin
3
5.36%
2
40.00%
Total
56
100.00%
5
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Dave Kleikamp
1292
74.99%
25
36.23%
Christoph Hellwig
104
6.04%
12
17.39%
David Howells
74
4.29%
1
1.45%
Marco Stornelli
62
3.60%
1
1.45%
Al Viro
47
2.73%
5
7.25%
Andrew Morton
39
2.26%
9
13.04%
Nicholas Piggin
38
2.21%
2
2.90%
Andrey V. Savochkin
15
0.87%
1
1.45%
Ingo Molnar
12
0.70%
1
1.45%
Chuck Lever
10
0.58%
1
1.45%
Mark Fasheh
7
0.41%
1
1.45%
Trond Myklebust
5
0.29%
1
1.45%
Omar Sandoval
5
0.29%
1
1.45%
Deepa Dinamani
4
0.23%
1
1.45%
Kent Overstreet
2
0.12%
1
1.45%
Johannes Weiner
2
0.12%
1
1.45%
Dmitriy Monakhov
1
0.06%
1
1.45%
Jan Kara
1
0.06%
1
1.45%
Badari Pulavarty
1
0.06%
1
1.45%
Richard Knutsson
1
0.06%
1
1.45%
Joe Perches
1
0.06%
1
1.45%
Total
1723
100.00%
69
100.00%
Directory: fs/jfs

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