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![Deepa Dinamani](/assets/img/avatar_default.png)
CURRENT_TIME macro is not appropriate for filesystems as it doesn't use the right granularity for filesystem timestamps. Use current_time() instead. CURRENT_TIME is also not y2038 safe. This is also in preparation for the patch that transitions vfs timestamps to use 64 bit time and hence make them y2038 safe. As part of the effort current_time() will be extended to do range checks. Hence, it is necessary for all file system timestamps to use current_time(). Also, current_time() will be transitioned along with vfs to be y2038 safe. Note that whenever a single call to current_time() is used to change timestamps in different inodes, it is because they share the same time granularity. Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Felipe Balbi <balbi@kernel.org> Acked-by: Steven Whitehouse <swhiteho@redhat.com> Acked-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Acked-by: David Sterba <dsterba@suse.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
424 lines
10 KiB
C
424 lines
10 KiB
C
/*
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* Copyright (C) International Business Machines Corp., 2000-2004
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* Portions Copyright (C) Christoph Hellwig, 2001-2002
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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
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* the 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/fs.h>
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#include <linux/mpage.h>
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#include <linux/buffer_head.h>
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#include <linux/pagemap.h>
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#include <linux/quotaops.h>
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#include <linux/uio.h>
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#include <linux/writeback.h>
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#include "jfs_incore.h"
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#include "jfs_inode.h"
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#include "jfs_filsys.h"
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#include "jfs_imap.h"
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#include "jfs_extent.h"
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#include "jfs_unicode.h"
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#include "jfs_debug.h"
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struct inode *jfs_iget(struct super_block *sb, unsigned long ino)
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{
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struct inode *inode;
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int ret;
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inode = iget_locked(sb, ino);
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if (!inode)
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return ERR_PTR(-ENOMEM);
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if (!(inode->i_state & I_NEW))
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return inode;
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ret = diRead(inode);
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if (ret < 0) {
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iget_failed(inode);
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return ERR_PTR(ret);
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}
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if (S_ISREG(inode->i_mode)) {
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inode->i_op = &jfs_file_inode_operations;
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inode->i_fop = &jfs_file_operations;
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inode->i_mapping->a_ops = &jfs_aops;
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} else if (S_ISDIR(inode->i_mode)) {
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inode->i_op = &jfs_dir_inode_operations;
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inode->i_fop = &jfs_dir_operations;
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} else if (S_ISLNK(inode->i_mode)) {
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if (inode->i_size >= IDATASIZE) {
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inode->i_op = &page_symlink_inode_operations;
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inode_nohighmem(inode);
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inode->i_mapping->a_ops = &jfs_aops;
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} else {
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inode->i_op = &jfs_fast_symlink_inode_operations;
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inode->i_link = JFS_IP(inode)->i_inline;
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/*
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* The inline data should be null-terminated, but
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* don't let on-disk corruption crash the kernel
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*/
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inode->i_link[inode->i_size] = '\0';
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}
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} else {
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inode->i_op = &jfs_file_inode_operations;
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init_special_inode(inode, inode->i_mode, inode->i_rdev);
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}
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unlock_new_inode(inode);
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return inode;
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}
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/*
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* Workhorse of both fsync & write_inode
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*/
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int jfs_commit_inode(struct inode *inode, int wait)
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{
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int rc = 0;
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tid_t tid;
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static int noisy = 5;
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jfs_info("In jfs_commit_inode, inode = 0x%p", inode);
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/*
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* Don't commit if inode has been committed since last being
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* marked dirty, or if it has been deleted.
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*/
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if (inode->i_nlink == 0 || !test_cflag(COMMIT_Dirty, inode))
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return 0;
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if (isReadOnly(inode)) {
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/* kernel allows writes to devices on read-only
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* partitions and may think inode is dirty
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*/
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if (!special_file(inode->i_mode) && noisy) {
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jfs_err("jfs_commit_inode(0x%p) called on read-only volume",
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inode);
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jfs_err("Is remount racy?");
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noisy--;
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}
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return 0;
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}
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tid = txBegin(inode->i_sb, COMMIT_INODE);
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mutex_lock(&JFS_IP(inode)->commit_mutex);
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/*
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* Retest inode state after taking commit_mutex
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*/
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if (inode->i_nlink && test_cflag(COMMIT_Dirty, inode))
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rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0);
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txEnd(tid);
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mutex_unlock(&JFS_IP(inode)->commit_mutex);
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return rc;
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}
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int jfs_write_inode(struct inode *inode, struct writeback_control *wbc)
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{
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int wait = wbc->sync_mode == WB_SYNC_ALL;
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if (inode->i_nlink == 0)
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return 0;
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/*
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* If COMMIT_DIRTY is not set, the inode isn't really dirty.
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* It has been committed since the last change, but was still
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* on the dirty inode list.
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*/
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if (!test_cflag(COMMIT_Dirty, inode)) {
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/* Make sure committed changes hit the disk */
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jfs_flush_journal(JFS_SBI(inode->i_sb)->log, wait);
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return 0;
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}
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if (jfs_commit_inode(inode, wait)) {
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jfs_err("jfs_write_inode: jfs_commit_inode failed!");
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return -EIO;
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} else
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return 0;
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}
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void jfs_evict_inode(struct inode *inode)
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{
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jfs_info("In jfs_evict_inode, inode = 0x%p", inode);
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if (!inode->i_nlink && !is_bad_inode(inode)) {
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dquot_initialize(inode);
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if (JFS_IP(inode)->fileset == FILESYSTEM_I) {
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truncate_inode_pages_final(&inode->i_data);
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if (test_cflag(COMMIT_Freewmap, inode))
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jfs_free_zero_link(inode);
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diFree(inode);
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/*
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* Free the inode from the quota allocation.
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*/
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dquot_initialize(inode);
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dquot_free_inode(inode);
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}
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} else {
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truncate_inode_pages_final(&inode->i_data);
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}
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clear_inode(inode);
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dquot_drop(inode);
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}
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void jfs_dirty_inode(struct inode *inode, int flags)
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{
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static int noisy = 5;
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if (isReadOnly(inode)) {
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if (!special_file(inode->i_mode) && noisy) {
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/* kernel allows writes to devices on read-only
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* partitions and may try to mark inode dirty
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*/
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jfs_err("jfs_dirty_inode called on read-only volume");
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jfs_err("Is remount racy?");
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noisy--;
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}
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return;
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}
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set_cflag(COMMIT_Dirty, inode);
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}
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int jfs_get_block(struct inode *ip, sector_t lblock,
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struct buffer_head *bh_result, int create)
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{
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s64 lblock64 = lblock;
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int rc = 0;
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xad_t xad;
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s64 xaddr;
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int xflag;
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s32 xlen = bh_result->b_size >> ip->i_blkbits;
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/*
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* Take appropriate lock on inode
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*/
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if (create)
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IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
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else
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IREAD_LOCK(ip, RDWRLOCK_NORMAL);
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if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) &&
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(!xtLookup(ip, lblock64, xlen, &xflag, &xaddr, &xlen, 0)) &&
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xaddr) {
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if (xflag & XAD_NOTRECORDED) {
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if (!create)
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/*
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* Allocated but not recorded, read treats
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* this as a hole
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*/
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goto unlock;
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#ifdef _JFS_4K
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XADoffset(&xad, lblock64);
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XADlength(&xad, xlen);
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XADaddress(&xad, xaddr);
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#else /* _JFS_4K */
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/*
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* As long as block size = 4K, this isn't a problem.
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* We should mark the whole page not ABNR, but how
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* will we know to mark the other blocks BH_New?
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*/
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BUG();
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#endif /* _JFS_4K */
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rc = extRecord(ip, &xad);
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if (rc)
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goto unlock;
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set_buffer_new(bh_result);
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}
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map_bh(bh_result, ip->i_sb, xaddr);
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bh_result->b_size = xlen << ip->i_blkbits;
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goto unlock;
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}
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if (!create)
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goto unlock;
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/*
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* Allocate a new block
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*/
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#ifdef _JFS_4K
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if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad)))
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goto unlock;
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rc = extAlloc(ip, xlen, lblock64, &xad, false);
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if (rc)
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goto unlock;
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set_buffer_new(bh_result);
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map_bh(bh_result, ip->i_sb, addressXAD(&xad));
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bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits;
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#else /* _JFS_4K */
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/*
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* We need to do whatever it takes to keep all but the last buffers
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* in 4K pages - see jfs_write.c
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*/
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BUG();
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#endif /* _JFS_4K */
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unlock:
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/*
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* Release lock on inode
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*/
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if (create)
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IWRITE_UNLOCK(ip);
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else
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IREAD_UNLOCK(ip);
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return rc;
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}
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static int jfs_writepage(struct page *page, struct writeback_control *wbc)
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{
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return block_write_full_page(page, jfs_get_block, wbc);
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}
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static int jfs_writepages(struct address_space *mapping,
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struct writeback_control *wbc)
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{
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return mpage_writepages(mapping, wbc, jfs_get_block);
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}
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static int jfs_readpage(struct file *file, struct page *page)
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{
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return mpage_readpage(page, jfs_get_block);
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}
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static int jfs_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, jfs_get_block);
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}
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static void jfs_write_failed(struct address_space *mapping, loff_t to)
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{
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struct inode *inode = mapping->host;
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if (to > inode->i_size) {
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truncate_pagecache(inode, inode->i_size);
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jfs_truncate(inode);
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}
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}
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static int jfs_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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int ret;
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ret = nobh_write_begin(mapping, pos, len, flags, pagep, fsdata,
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jfs_get_block);
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if (unlikely(ret))
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jfs_write_failed(mapping, pos + len);
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return ret;
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}
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static sector_t jfs_bmap(struct address_space *mapping, sector_t block)
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{
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return generic_block_bmap(mapping, block, jfs_get_block);
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}
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static ssize_t jfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
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{
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struct file *file = iocb->ki_filp;
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struct address_space *mapping = file->f_mapping;
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struct inode *inode = file->f_mapping->host;
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size_t count = iov_iter_count(iter);
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ssize_t ret;
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ret = blockdev_direct_IO(iocb, inode, iter, jfs_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(iov_iter_rw(iter) == WRITE && ret < 0)) {
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loff_t isize = i_size_read(inode);
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loff_t end = iocb->ki_pos + count;
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if (end > isize)
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jfs_write_failed(mapping, end);
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}
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return ret;
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}
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const struct address_space_operations jfs_aops = {
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.readpage = jfs_readpage,
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.readpages = jfs_readpages,
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.writepage = jfs_writepage,
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.writepages = jfs_writepages,
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.write_begin = jfs_write_begin,
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.write_end = nobh_write_end,
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.bmap = jfs_bmap,
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.direct_IO = jfs_direct_IO,
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};
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/*
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* Guts of jfs_truncate. Called with locks already held. Can be called
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* with directory for truncating directory index table.
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*/
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void jfs_truncate_nolock(struct inode *ip, loff_t length)
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{
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loff_t newsize;
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tid_t tid;
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ASSERT(length >= 0);
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if (test_cflag(COMMIT_Nolink, ip)) {
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xtTruncate(0, ip, length, COMMIT_WMAP);
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return;
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}
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do {
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tid = txBegin(ip->i_sb, 0);
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/*
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* The commit_mutex cannot be taken before txBegin.
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* txBegin may block and there is a chance the inode
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* could be marked dirty and need to be committed
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* before txBegin unblocks
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*/
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mutex_lock(&JFS_IP(ip)->commit_mutex);
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newsize = xtTruncate(tid, ip, length,
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COMMIT_TRUNCATE | COMMIT_PWMAP);
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if (newsize < 0) {
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txEnd(tid);
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mutex_unlock(&JFS_IP(ip)->commit_mutex);
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break;
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}
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ip->i_mtime = ip->i_ctime = current_time(ip);
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mark_inode_dirty(ip);
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txCommit(tid, 1, &ip, 0);
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txEnd(tid);
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mutex_unlock(&JFS_IP(ip)->commit_mutex);
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} while (newsize > length); /* Truncate isn't always atomic */
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}
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void jfs_truncate(struct inode *ip)
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{
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jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size);
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nobh_truncate_page(ip->i_mapping, ip->i_size, jfs_get_block);
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IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
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jfs_truncate_nolock(ip, ip->i_size);
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IWRITE_UNLOCK(ip);
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}
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