You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
372 lines
8.9 KiB
372 lines
8.9 KiB
/*
|
|
* 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 "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"
|
|
|
|
|
|
void jfs_read_inode(struct inode *inode)
|
|
{
|
|
if (diRead(inode)) {
|
|
make_bad_inode(inode);
|
|
return;
|
|
}
|
|
|
|
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->i_mapping->a_ops = &jfs_aops;
|
|
} else
|
|
inode->i_op = &jfs_symlink_inode_operations;
|
|
} else {
|
|
inode->i_op = &jfs_file_inode_operations;
|
|
init_special_inode(inode, inode->i_mode, inode->i_rdev);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
down(&JFS_IP(inode)->commit_sem);
|
|
|
|
/*
|
|
* Retest inode state after taking commit_sem
|
|
*/
|
|
if (inode->i_nlink && test_cflag(COMMIT_Dirty, inode))
|
|
rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0);
|
|
|
|
txEnd(tid);
|
|
up(&JFS_IP(inode)->commit_sem);
|
|
return rc;
|
|
}
|
|
|
|
int jfs_write_inode(struct inode *inode, int wait)
|
|
{
|
|
if (test_cflag(COMMIT_Nolink, inode))
|
|
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;
|
|
}
|
|
|
|
void jfs_delete_inode(struct inode *inode)
|
|
{
|
|
jfs_info("In jfs_delete_inode, inode = 0x%p", inode);
|
|
|
|
if (!is_bad_inode(inode) &&
|
|
(JFS_IP(inode)->fileset == cpu_to_le32(FILESYSTEM_I))) {
|
|
|
|
truncate_inode_pages(&inode->i_data, 0);
|
|
|
|
if (test_cflag(COMMIT_Freewmap, inode))
|
|
jfs_free_zero_link(inode);
|
|
|
|
diFree(inode);
|
|
|
|
/*
|
|
* Free the inode from the quota allocation.
|
|
*/
|
|
DQUOT_INIT(inode);
|
|
DQUOT_FREE_INODE(inode);
|
|
DQUOT_DROP(inode);
|
|
}
|
|
|
|
clear_inode(inode);
|
|
}
|
|
|
|
void jfs_dirty_inode(struct inode *inode)
|
|
{
|
|
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);
|
|
}
|
|
|
|
static int
|
|
jfs_get_blocks(struct inode *ip, sector_t lblock, unsigned long max_blocks,
|
|
struct buffer_head *bh_result, int create)
|
|
{
|
|
s64 lblock64 = lblock;
|
|
int rc = 0;
|
|
xad_t xad;
|
|
s64 xaddr;
|
|
int xflag;
|
|
s32 xlen = max_blocks;
|
|
|
|
/*
|
|
* Take appropriate lock on inode
|
|
*/
|
|
if (create)
|
|
IWRITE_LOCK(ip);
|
|
else
|
|
IREAD_LOCK(ip);
|
|
|
|
if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) &&
|
|
(!xtLookup(ip, lblock64, max_blocks, &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;
|
|
}
|
|
|
|
static int jfs_get_block(struct inode *ip, sector_t lblock,
|
|
struct buffer_head *bh_result, int create)
|
|
{
|
|
return jfs_get_blocks(ip, lblock, 1, bh_result, create);
|
|
}
|
|
|
|
static int jfs_writepage(struct page *page, struct writeback_control *wbc)
|
|
{
|
|
return nobh_writepage(page, jfs_get_block, wbc);
|
|
}
|
|
|
|
static int jfs_writepages(struct address_space *mapping,
|
|
struct writeback_control *wbc)
|
|
{
|
|
return mpage_writepages(mapping, wbc, jfs_get_block);
|
|
}
|
|
|
|
static int jfs_readpage(struct file *file, struct page *page)
|
|
{
|
|
return mpage_readpage(page, jfs_get_block);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
static int jfs_prepare_write(struct file *file,
|
|
struct page *page, unsigned from, unsigned to)
|
|
{
|
|
return nobh_prepare_write(page, from, to, jfs_get_block);
|
|
}
|
|
|
|
static sector_t jfs_bmap(struct address_space *mapping, sector_t block)
|
|
{
|
|
return generic_block_bmap(mapping, block, jfs_get_block);
|
|
}
|
|
|
|
static ssize_t jfs_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;
|
|
|
|
return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
|
|
offset, nr_segs, jfs_get_blocks, NULL);
|
|
}
|
|
|
|
struct address_space_operations jfs_aops = {
|
|
.readpage = jfs_readpage,
|
|
.readpages = jfs_readpages,
|
|
.writepage = jfs_writepage,
|
|
.writepages = jfs_writepages,
|
|
.sync_page = block_sync_page,
|
|
.prepare_write = jfs_prepare_write,
|
|
.commit_write = nobh_commit_write,
|
|
.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_sem 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
|
|
*/
|
|
down(&JFS_IP(ip)->commit_sem);
|
|
|
|
newsize = xtTruncate(tid, ip, length,
|
|
COMMIT_TRUNCATE | COMMIT_PWMAP);
|
|
if (newsize < 0) {
|
|
txEnd(tid);
|
|
up(&JFS_IP(ip)->commit_sem);
|
|
break;
|
|
}
|
|
|
|
ip->i_mtime = ip->i_ctime = CURRENT_TIME;
|
|
mark_inode_dirty(ip);
|
|
|
|
txCommit(tid, 1, &ip, 0);
|
|
txEnd(tid);
|
|
up(&JFS_IP(ip)->commit_sem);
|
|
} while (newsize > length); /* Truncate isn't always atomic */
|
|
}
|
|
|
|
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);
|
|
|
|
IWRITE_LOCK(ip);
|
|
jfs_truncate_nolock(ip, ip->i_size);
|
|
IWRITE_UNLOCK(ip);
|
|
}
|
|
|