--- /dev/null
+/*
+ * gcinode.c - NILFS memory inode for GC
+ *
+ * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * Written by Seiji Kihara <kihara@osrg.net>, Amagai Yoshiji <amagai@osrg.net>,
+ * and Ryusuke Konishi <ryusuke@osrg.net>.
+ * Revised by Ryusuke Konishi <ryusuke@osrg.net>.
+ *
+ */
+
+#include <linux/buffer_head.h>
+#include <linux/mpage.h>
+#include <linux/hash.h>
+#include <linux/swap.h>
+#include "nilfs.h"
+#include "page.h"
+#include "mdt.h"
+#include "dat.h"
+#include "ifile.h"
+
+static struct address_space_operations def_gcinode_aops = {};
+/* XXX need def_gcinode_iops/fops? */
+
+/*
+ * nilfs_gccache_submit_read_data() - add data buffer and submit read request
+ * @inode - gc inode
+ * @blkoff - dummy offset treated as the key for the page cache
+ * @pbn - physical block number of the block
+ * @vbn - virtual block number of the block, 0 for non-virtual block
+ * @out_bh - indirect pointer to a buffer_head struct to receive the results
+ *
+ * Description: nilfs_gccache_submit_read_data() registers the data buffer
+ * specified by @pbn to the GC pagecache with the key @blkoff.
+ * This function sets @vbn (@pbn if @vbn is zero) in b_blocknr of the buffer.
+ *
+ * Return Value: On success, 0 is returned. On Error, one of the following
+ * negative error code is returned.
+ *
+ * %-EIO - I/O error.
+ *
+ * %-ENOMEM - Insufficient amount of memory available.
+ *
+ * %-ENOENT - The block specified with @pbn does not exist.
+ */
+int nilfs_gccache_submit_read_data(struct inode *inode, sector_t blkoff,
+ sector_t pbn, __u64 vbn,
+ struct buffer_head **out_bh)
+{
+ struct buffer_head *bh;
+ int err;
+
+ bh = nilfs_grab_buffer(inode, inode->i_mapping, blkoff, 0);
+ if (unlikely(!bh))
+ return -ENOMEM;
+
+ if (buffer_uptodate(bh))
+ goto out;
+
+ if (pbn == 0) {
+ struct inode *dat_inode = NILFS_I_NILFS(inode)->ns_dat;
+ /* use original dat, not gc dat. */
+ err = nilfs_dat_translate(dat_inode, vbn, &pbn);
+ if (unlikely(err)) { /* -EIO, -ENOMEM, -ENOENT */
+ brelse(bh);
+ goto failed;
+ }
+ }
+
+ lock_buffer(bh);
+ if (buffer_uptodate(bh)) {
+ unlock_buffer(bh);
+ goto out;
+ }
+
+ if (!buffer_mapped(bh)) {
+ bh->b_bdev = NILFS_I_NILFS(inode)->ns_bdev;
+ set_buffer_mapped(bh);
+ }
+ bh->b_blocknr = pbn;
+ bh->b_end_io = end_buffer_read_sync;
+ get_bh(bh);
+ submit_bh(READ, bh);
+ if (vbn)
+ bh->b_blocknr = vbn;
+ out:
+ err = 0;
+ *out_bh = bh;
+
+ failed:
+ unlock_page(bh->b_page);
+ page_cache_release(bh->b_page);
+ return err;
+}
+
+/*
+ * nilfs_gccache_submit_read_node() - add node buffer and submit read request
+ * @inode - gc inode
+ * @pbn - physical block number for the block
+ * @vbn - virtual block number for the block
+ * @out_bh - indirect pointer to a buffer_head struct to receive the results
+ *
+ * Description: nilfs_gccache_submit_read_node() registers the node buffer
+ * specified by @vbn to the GC pagecache. @pbn can be supplied by the
+ * caller to avoid translation of the disk block address.
+ *
+ * Return Value: On success, 0 is returned. On Error, one of the following
+ * negative error code is returned.
+ *
+ * %-EIO - I/O error.
+ *
+ * %-ENOMEM - Insufficient amount of memory available.
+ */
+int nilfs_gccache_submit_read_node(struct inode *inode, sector_t pbn,
+ __u64 vbn, struct buffer_head **out_bh)
+{
+ int ret = nilfs_btnode_submit_block(&NILFS_I(inode)->i_btnode_cache,
+ vbn ? : pbn, pbn, out_bh, 0);
+ if (ret == -EEXIST) /* internal code (cache hit) */
+ ret = 0;
+ return ret;
+}
+
+int nilfs_gccache_wait_and_mark_dirty(struct buffer_head *bh)
+{
+ wait_on_buffer(bh);
+ if (!buffer_uptodate(bh))
+ return -EIO;
+ if (buffer_dirty(bh))
+ return -EEXIST;
+
+ if (buffer_nilfs_node(bh))
+ nilfs_btnode_mark_dirty(bh);
+ else
+ nilfs_mdt_mark_buffer_dirty(bh);
+ return 0;
+}
+
+/*
+ * nilfs_init_gccache() - allocate and initialize gc_inode hash table
+ * @nilfs - the_nilfs
+ *
+ * Return Value: On success, 0.
+ * On error, a negative error code is returned.
+ */
+int nilfs_init_gccache(struct the_nilfs *nilfs)
+{
+ int loop;
+
+ BUG_ON(nilfs->ns_gc_inodes_h);
+
+ INIT_LIST_HEAD(&nilfs->ns_gc_inodes);
+
+ nilfs->ns_gc_inodes_h =
+ kmalloc(sizeof(struct hlist_head) * NILFS_GCINODE_HASH_SIZE,
+ GFP_NOFS);
+ if (nilfs->ns_gc_inodes_h == NULL)
+ return -ENOMEM;
+
+ for (loop = 0; loop < NILFS_GCINODE_HASH_SIZE; loop++)
+ INIT_HLIST_HEAD(&nilfs->ns_gc_inodes_h[loop]);
+ return 0;
+}
+
+/*
+ * nilfs_destroy_gccache() - free gc_inode hash table
+ * @nilfs - the nilfs
+ */
+void nilfs_destroy_gccache(struct the_nilfs *nilfs)
+{
+ if (nilfs->ns_gc_inodes_h) {
+ nilfs_remove_all_gcinode(nilfs);
+ kfree(nilfs->ns_gc_inodes_h);
+ nilfs->ns_gc_inodes_h = NULL;
+ }
+}
+
+static struct inode *alloc_gcinode(struct the_nilfs *nilfs, ino_t ino,
+ __u64 cno)
+{
+ struct inode *inode = nilfs_mdt_new_common(nilfs, NULL, ino, GFP_NOFS);
+ struct nilfs_inode_info *ii;
+
+ if (!inode)
+ return NULL;
+
+ inode->i_op = NULL;
+ inode->i_fop = NULL;
+ inode->i_mapping->a_ops = &def_gcinode_aops;
+
+ ii = NILFS_I(inode);
+ ii->i_cno = cno;
+ ii->i_flags = 0;
+ ii->i_state = 1 << NILFS_I_GCINODE;
+ ii->i_bh = NULL;
+ ii->i_dtime = 0;
+ nilfs_bmap_init_gc(ii->i_bmap);
+
+ return inode;
+}
+
+static unsigned long ihash(ino_t ino, __u64 cno)
+{
+ return hash_long((unsigned long)((ino << 2) + cno),
+ NILFS_GCINODE_HASH_BITS);
+}
+
+/*
+ * nilfs_gc_iget() - find or create gc inode with specified (ino,cno)
+ */
+struct inode *nilfs_gc_iget(struct the_nilfs *nilfs, ino_t ino, __u64 cno)
+{
+ struct hlist_head *head = nilfs->ns_gc_inodes_h + ihash(ino, cno);
+ struct hlist_node *node;
+ struct inode *inode;
+
+ hlist_for_each_entry(inode, node, head, i_hash) {
+ if (inode->i_ino == ino && NILFS_I(inode)->i_cno == cno)
+ return inode;
+ }
+
+ inode = alloc_gcinode(nilfs, ino, cno);
+ if (likely(inode)) {
+ hlist_add_head(&inode->i_hash, head);
+ list_add(&NILFS_I(inode)->i_dirty, &nilfs->ns_gc_inodes);
+ }
+ return inode;
+}
+
+/*
+ * nilfs_clear_gcinode() - clear and free a gc inode
+ */
+void nilfs_clear_gcinode(struct inode *inode)
+{
+ nilfs_mdt_clear(inode);
+ nilfs_mdt_destroy(inode);
+}
+
+/*
+ * nilfs_remove_all_gcinode() - remove all inodes from the_nilfs
+ */
+void nilfs_remove_all_gcinode(struct the_nilfs *nilfs)
+{
+ struct hlist_head *head = nilfs->ns_gc_inodes_h;
+ struct hlist_node *node, *n;
+ struct inode *inode;
+ int loop;
+
+ for (loop = 0; loop < NILFS_GCINODE_HASH_SIZE; loop++, head++) {
+ hlist_for_each_entry_safe(inode, node, n, head, i_hash) {
+ hlist_del_init(&inode->i_hash);
+ list_del_init(&NILFS_I(inode)->i_dirty);
+ nilfs_clear_gcinode(inode); /* might sleep */
+ }
+ }
+}
projects / GitHub / exynos8895 / android_kernel_samsung_universal8895.git / commitdiff