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-rw-r--r--fs/jfs/inode.c384
1 files changed, 384 insertions, 0 deletions
diff --git a/fs/jfs/inode.c b/fs/jfs/inode.c
new file mode 100644
index 0000000..7bc9066
--- /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);
+}
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