1 files changed, 384 insertions, 0 deletions

diff --git a/fs/jfs/inode.c b/fs/jfs/inode.c
new file mode 100644
index 000000000000..7bc906677b0d
--- /dev/null
+++ b/fs/jfs/inode.c
@@ -0,0 +1,384 @@
+/*
+ *   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_filsys.h"
+#include "jfs_imap.h"
+#include "jfs_extent.h"
+#include "jfs_unicode.h"
+#include "jfs_debug.h"
+
+
+extern struct inode_operations jfs_dir_inode_operations;
+extern struct inode_operations jfs_file_inode_operations;
+extern struct inode_operations jfs_symlink_inode_operations;
+extern struct file_operations jfs_dir_operations;
+extern struct file_operations jfs_file_operations;
+struct address_space_operations jfs_aops;
+extern int freeZeroLink(struct inode *);
+
+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 (test_cflag(COMMIT_Freewmap, inode))
+                freeZeroLink(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;
+        int take_locks;
+        xad_t xad;
+        s64 xaddr;
+        int xflag;
+        s32 xlen;
+
+        /*
+         * If this is a special inode (imap, dmap)
+         * the lock should already be taken
+         */
+        take_locks = (JFS_IP(ip)->fileset != AGGREGATE_I);
+
+        /*
+         * Take appropriate lock on inode
+         */
+        if (take_locks) {
+                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)
+             == 0) && xlen) {
+                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, max_blocks, 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 (take_locks) {
+                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);
+}