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Diffstat (limited to 'fs/nilfs2/gcinode.c')
-rw-r--r--fs/nilfs2/gcinode.c159
1 files changed, 34 insertions, 125 deletions
diff --git a/fs/nilfs2/gcinode.c b/fs/nilfs2/gcinode.c
index 8880a9e281e..57ceaf33d17 100644
--- a/fs/nilfs2/gcinode.c
+++ b/fs/nilfs2/gcinode.c
@@ -28,13 +28,6 @@
* gcinodes), and this file provides lookup function of the dummy
* inodes and their buffer read function.
*
- * Since NILFS2 keeps up multiple checkpoints/snapshots across GC, it
- * has to treat blocks that belong to a same file but have different
- * checkpoint numbers. To avoid interference among generations, dummy
- * inodes are managed separately from actual inodes, and their lookup
- * function (nilfs_gc_iget) is designed to be specified with a
- * checkpoint number argument as well as an inode number.
- *
* Buffers and pages held by the dummy inodes will be released each
* time after they are copied to a new log. Dirty blocks made on the
* current generation and the blocks to be moved by GC never overlap
@@ -45,17 +38,16 @@
#include <linux/buffer_head.h>
#include <linux/mpage.h>
#include <linux/hash.h>
+#include <linux/slab.h>
#include <linux/swap.h>
#include "nilfs.h"
+#include "btree.h"
+#include "btnode.h"
#include "page.h"
#include "mdt.h"
#include "dat.h"
#include "ifile.h"
-static const struct address_space_operations def_gcinode_aops = {
- .sync_page = block_sync_page,
-};
-
/*
* nilfs_gccache_submit_read_data() - add data buffer and submit read request
* @inode - gc inode
@@ -92,9 +84,9 @@ int nilfs_gccache_submit_read_data(struct inode *inode, sector_t blkoff,
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);
+ struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
+
+ err = nilfs_dat_translate(nilfs->ns_dat, vbn, &pbn);
if (unlikely(err)) { /* -EIO, -ENOMEM, -ENOENT */
brelse(bh);
goto failed;
@@ -108,7 +100,7 @@ int nilfs_gccache_submit_read_data(struct inode *inode, sector_t blkoff,
}
if (!buffer_mapped(bh)) {
- bh->b_bdev = NILFS_I_NILFS(inode)->ns_bdev;
+ bh->b_bdev = inode->i_sb->s_bdev;
set_buffer_mapped(bh);
}
bh->b_blocknr = pbn;
@@ -148,8 +140,10 @@ int nilfs_gccache_submit_read_data(struct inode *inode, sector_t blkoff,
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);
+ int ret;
+
+ ret = nilfs_btnode_submit_block(&NILFS_I(inode)->i_btnode_cache,
+ vbn ? : pbn, pbn, READ, out_bh, &pbn);
if (ret == -EEXIST) /* internal code (cache hit) */
ret = 0;
return ret;
@@ -163,127 +157,42 @@ int nilfs_gccache_wait_and_mark_dirty(struct buffer_head *bh)
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]);
+ if (buffer_nilfs_node(bh) && nilfs_btree_broken_node_block(bh)) {
+ clear_buffer_uptodate(bh);
+ return -EIO;
+ }
+ mark_buffer_dirty(bh);
return 0;
}
-/*
- * nilfs_destroy_gccache() - free gc_inode hash table
- * @nilfs - the nilfs
- */
-void nilfs_destroy_gccache(struct the_nilfs *nilfs)
+int nilfs_init_gcinode(struct inode *inode)
{
- if (nilfs->ns_gc_inodes_h) {
- nilfs_remove_all_gcinode(nilfs);
- kfree(nilfs->ns_gc_inodes_h);
- nilfs->ns_gc_inodes_h = NULL;
- }
-}
+ struct nilfs_inode_info *ii = NILFS_I(inode);
-static struct inode *alloc_gcinode(struct the_nilfs *nilfs, ino_t ino,
- __u64 cno)
-{
- struct inode *inode;
- struct nilfs_inode_info *ii;
+ inode->i_mode = S_IFREG;
+ mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
+ inode->i_mapping->a_ops = &empty_aops;
+ inode->i_mapping->backing_dev_info = inode->i_sb->s_bdi;
- inode = nilfs_mdt_new_common(nilfs, NULL, ino, GFP_NOFS, 0);
- 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;
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_destroy(inode);
+ return 0;
}
-/*
- * nilfs_remove_all_gcinode() - remove all inodes from the_nilfs
+/**
+ * nilfs_remove_all_gcinodes() - remove all unprocessed gc inodes
*/
-void nilfs_remove_all_gcinode(struct the_nilfs *nilfs)
+void nilfs_remove_all_gcinodes(struct the_nilfs *nilfs)
{
- struct hlist_head *head = nilfs->ns_gc_inodes_h;
- struct hlist_node *node, *n;
- struct inode *inode;
- int loop;
+ struct list_head *head = &nilfs->ns_gc_inodes;
+ struct nilfs_inode_info *ii;
- 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 */
- }
+ while (!list_empty(head)) {
+ ii = list_first_entry(head, struct nilfs_inode_info, i_dirty);
+ list_del_init(&ii->i_dirty);
+ truncate_inode_pages(&ii->vfs_inode.i_data, 0);
+ nilfs_btnode_cache_clear(&ii->i_btnode_cache);
+ iput(&ii->vfs_inode);
}
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-05 20:39:57 +0000