--- /dev/null
+/*
+ * 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->i_mapping->a_ops = &jfs_aops;
+ } else {
+ inode->i_op = &jfs_fast_symlink_inode_operations;
+ /*
+ * The inline data should be null-terminated, but
+ * don't let on-disk corruption crash the kernel
+ */
+ JFS_IP(inode)->i_inline[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;
+}
+
+/*
+ * 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;
+}
+
+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;
+}
+
+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);
+}
+
+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);
+}
+
+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;
+}
+
+static int jfs_writepage(struct page *page, struct writeback_control *wbc)
+{
+ return block_write_full_page(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 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);
+ }
+}
+
+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;
+}
+
+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(struct kiocb *iocb, struct iov_iter *iter,
+ loff_t offset)
+{
+ 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, offset, 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 = offset + count;
+
+ if (end > isize)
+ jfs_write_failed(mapping, end);
+ }
+
+ return ret;
+}
+
+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;
+ 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 */
+}
+
+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);
+}
Code Review / kvmfornfv.git / blobdiff