1 files changed, 0 insertions, 428 deletions
diff --git a/fs/logfs/inode.c b/fs/logfs/inode.c
deleted file mode 100644
index f440a1525da8..000000000000
--- a/fs/logfs/inode.c
+++ /dev/null
@@ -1,428 +0,0 @@
-/*
- * fs/logfs/inode.c	- inode handling code
- *
- * As should be obvious for Linux kernel code, license is GPLv2
- *
- * Copyright (c) 2005-2008 Joern Engel <joern@logfs.org>
- */
-#include "logfs.h"
-#include <linux/slab.h>
-#include <linux/writeback.h>
-#include <linux/backing-dev.h>
-
-/*
- * How soon to reuse old inode numbers?  LogFS doesn't store deleted inodes
- * on the medium.  It therefore also lacks a method to store the previous
- * generation number for deleted inodes.  Instead a single generation number
- * is stored which will be used for new inodes.  Being just a 32bit counter,
- * this can obvious wrap relatively quickly.  So we only reuse inodes if we
- * know that a fair number of inodes can be created before we have to increment
- * the generation again - effectively adding some bits to the counter.
- * But being too aggressive here means we keep a very large and very sparse
- * inode file, wasting space on indirect blocks.
- * So what is a good value?  Beats me.  64k seems moderately bad on both
- * fronts, so let's use that for now...
- *
- * NFS sucks, as everyone already knows.
- */
-#define INOS_PER_WRAP (0x10000)
-
-/*
- * Logfs' requirement to read inodes for garbage collection makes life a bit
- * harder.  GC may have to read inodes that are in I_FREEING state, when they
- * are being written out - and waiting for GC to make progress, naturally.
- *
- * So we cannot just call iget() or some variant of it, but first have to check
- * whether the inode in question might be in I_FREEING state.  Therefore we
- * maintain our own per-sb list of "almost deleted" inodes and check against
- * that list first.  Normally this should be at most 1-2 entries long.
- *
- * Also, inodes have logfs-specific reference counting on top of what the vfs
- * does.  When .destroy_inode is called, normally the reference count will drop
- * to zero and the inode gets deleted.  But if GC accessed the inode, its
- * refcount will remain nonzero and final deletion will have to wait.
- *
- * As a result we have two sets of functions to get/put inodes:
- * logfs_safe_iget/logfs_safe_iput	- safe to call from GC context
- * logfs_iget/iput			- normal version
- */
-static struct kmem_cache *logfs_inode_cache;
-
-static DEFINE_SPINLOCK(logfs_inode_lock);
-
-static void logfs_inode_setops(struct inode *inode)
-{
-	switch (inode->i_mode & S_IFMT) {
-	case S_IFDIR:
-		inode->i_op = &logfs_dir_iops;
-		inode->i_fop = &logfs_dir_fops;
-		inode->i_mapping->a_ops = &logfs_reg_aops;
-		break;
-	case S_IFREG:
-		inode->i_op = &logfs_reg_iops;
-		inode->i_fop = &logfs_reg_fops;
-		inode->i_mapping->a_ops = &logfs_reg_aops;
-		break;
-	case S_IFLNK:
-		inode->i_op = &page_symlink_inode_operations;
-		inode_nohighmem(inode);
-		inode->i_mapping->a_ops = &logfs_reg_aops;
-		break;
-	case S_IFSOCK:	/* fall through */
-	case S_IFBLK:	/* fall through */
-	case S_IFCHR:	/* fall through */
-	case S_IFIFO:
-		init_special_inode(inode, inode->i_mode, inode->i_rdev);
-		break;
-	default:
-		BUG();
-	}
-}
-
-static struct inode *__logfs_iget(struct super_block *sb, ino_t ino)
-{
-	struct inode *inode = iget_locked(sb, ino);
-	int err;
-
-	if (!inode)
-		return ERR_PTR(-ENOMEM);
-	if (!(inode->i_state & I_NEW))
-		return inode;
-
-	err = logfs_read_inode(inode);
-	if (err || inode->i_nlink == 0) {
-		/* inode->i_nlink == 0 can be true when called from
-		 * block validator */
-		/* set i_nlink to 0 to prevent caching */
-		clear_nlink(inode);
-		logfs_inode(inode)->li_flags |= LOGFS_IF_ZOMBIE;
-		iget_failed(inode);
-		if (!err)
-			err = -ENOENT;
-		return ERR_PTR(err);
-	}
-
-	logfs_inode_setops(inode);
-	unlock_new_inode(inode);
-	return inode;
-}
-
-struct inode *logfs_iget(struct super_block *sb, ino_t ino)
-{
-	BUG_ON(ino == LOGFS_INO_MASTER);
-	BUG_ON(ino == LOGFS_INO_SEGFILE);
-	return __logfs_iget(sb, ino);
-}
-
-/*
- * is_cached is set to 1 if we hand out a cached inode, 0 otherwise.
- * this allows logfs_iput to do the right thing later
- */
-struct inode *logfs_safe_iget(struct super_block *sb, ino_t ino, int *is_cached)
-{
-	struct logfs_super *super = logfs_super(sb);
-	struct logfs_inode *li;
-
-	if (ino == LOGFS_INO_MASTER)
-		return super->s_master_inode;
-	if (ino == LOGFS_INO_SEGFILE)
-		return super->s_segfile_inode;
-
-	spin_lock(&logfs_inode_lock);
-	list_for_each_entry(li, &super->s_freeing_list, li_freeing_list)
-		if (li->vfs_inode.i_ino == ino) {
-			li->li_refcount++;
-			spin_unlock(&logfs_inode_lock);
-			*is_cached = 1;
-			return &li->vfs_inode;
-		}
-	spin_unlock(&logfs_inode_lock);
-
-	*is_cached = 0;
-	return __logfs_iget(sb, ino);
-}
-
-static void logfs_i_callback(struct rcu_head *head)
-{
-	struct inode *inode = container_of(head, struct inode, i_rcu);
-	kmem_cache_free(logfs_inode_cache, logfs_inode(inode));
-}
-
-static void __logfs_destroy_inode(struct inode *inode)
-{
-	struct logfs_inode *li = logfs_inode(inode);
-
-	BUG_ON(li->li_block);
-	list_del(&li->li_freeing_list);
-	call_rcu(&inode->i_rcu, logfs_i_callback);
-}
-
-static void __logfs_destroy_meta_inode(struct inode *inode)
-{
-	struct logfs_inode *li = logfs_inode(inode);
-	BUG_ON(li->li_block);
-	call_rcu(&inode->i_rcu, logfs_i_callback);
-}
-
-static void logfs_destroy_inode(struct inode *inode)
-{
-	struct logfs_inode *li = logfs_inode(inode);
-
-	if (inode->i_ino < LOGFS_RESERVED_INOS) {
-		/*
-		 * The reserved inodes are never destroyed unless we are in
-		 * unmont path.
-		 */
-		__logfs_destroy_meta_inode(inode);
-		return;
-	}
-
-	BUG_ON(list_empty(&li->li_freeing_list));
-	spin_lock(&logfs_inode_lock);
-	li->li_refcount--;
-	if (li->li_refcount == 0)
-		__logfs_destroy_inode(inode);
-	spin_unlock(&logfs_inode_lock);
-}
-
-void logfs_safe_iput(struct inode *inode, int is_cached)
-{
-	if (inode->i_ino == LOGFS_INO_MASTER)
-		return;
-	if (inode->i_ino == LOGFS_INO_SEGFILE)
-		return;
-
-	if (is_cached) {
-		logfs_destroy_inode(inode);
-		return;
-	}
-
-	iput(inode);
-}
-
-static void logfs_init_inode(struct super_block *sb, struct inode *inode)
-{
-	struct logfs_inode *li = logfs_inode(inode);
-	int i;
-
-	li->li_flags	= 0;
-	li->li_height	= 0;
-	li->li_used_bytes = 0;
-	li->li_block	= NULL;
-	i_uid_write(inode, 0);
-	i_gid_write(inode, 0);
-	inode->i_size	= 0;
-	inode->i_blocks	= 0;
-	inode->i_ctime	= current_time(inode);
-	inode->i_mtime	= current_time(inode);
-	li->li_refcount = 1;
-	INIT_LIST_HEAD(&li->li_freeing_list);
-
-	for (i = 0; i < LOGFS_EMBEDDED_FIELDS; i++)
-		li->li_data[i] = 0;
-
-	return;
-}
-
-static struct inode *logfs_alloc_inode(struct super_block *sb)
-{
-	struct logfs_inode *li;
-
-	li = kmem_cache_alloc(logfs_inode_cache, GFP_NOFS);
-	if (!li)
-		return NULL;
-	logfs_init_inode(sb, &li->vfs_inode);
-	return &li->vfs_inode;
-}
-
-/*
- * In logfs inodes are written to an inode file.  The inode file, like any
- * other file, is managed with a inode.  The inode file's inode, aka master
- * inode, requires special handling in several respects.  First, it cannot be
- * written to the inode file, so it is stored in the journal instead.
- *
- * Secondly, this inode cannot be written back and destroyed before all other
- * inodes have been written.  The ordering is important.  Linux' VFS is happily
- * unaware of the ordering constraint and would ordinarily destroy the master
- * inode at umount time while other inodes are still in use and dirty.  Not
- * good.
- *
- * So logfs makes sure the master inode is not written until all other inodes
- * have been destroyed.  Sadly, this method has another side-effect.  The VFS
- * will notice one remaining inode and print a frightening warning message.
- * Worse, it is impossible to judge whether such a warning was caused by the
- * master inode or any other inodes have leaked as well.
- *
- * Our attempt of solving this is with logfs_new_meta_inode() below.  Its
- * purpose is to create a new inode that will not trigger the warning if such
- * an inode is still in use.  An ugly hack, no doubt.  Suggections for
- * improvement are welcome.
- *
- * AV: that's what ->put_super() is for...
- */
-struct inode *logfs_new_meta_inode(struct super_block *sb, u64 ino)
-{
-	struct inode *inode;
-
-	inode = new_inode(sb);
-	if (!inode)
-		return ERR_PTR(-ENOMEM);
-
-	inode->i_mode = S_IFREG;
-	inode->i_ino = ino;
-	inode->i_data.a_ops = &logfs_reg_aops;
-	mapping_set_gfp_mask(&inode->i_data, GFP_NOFS);
-
-	return inode;
-}
-
-struct inode *logfs_read_meta_inode(struct super_block *sb, u64 ino)
-{
-	struct inode *inode;
-	int err;
-
-	inode = logfs_new_meta_inode(sb, ino);
-	if (IS_ERR(inode))
-		return inode;
-
-	err = logfs_read_inode(inode);
-	if (err) {
-		iput(inode);
-		return ERR_PTR(err);
-	}
-	logfs_inode_setops(inode);
-	return inode;
-}
-
-static int logfs_write_inode(struct inode *inode, struct writeback_control *wbc)
-{
-	int ret;
-	long flags = WF_LOCK;
-
-	/* Can only happen if creat() failed.  Safe to skip. */
-	if (logfs_inode(inode)->li_flags & LOGFS_IF_STILLBORN)
-		return 0;
-
-	ret = __logfs_write_inode(inode, NULL, flags);
-	LOGFS_BUG_ON(ret, inode->i_sb);
-	return ret;
-}
-
-/* called with inode->i_lock held */
-static int logfs_drop_inode(struct inode *inode)
-{
-	struct logfs_super *super = logfs_super(inode->i_sb);
-	struct logfs_inode *li = logfs_inode(inode);
-
-	spin_lock(&logfs_inode_lock);
-	list_move(&li->li_freeing_list, &super->s_freeing_list);
-	spin_unlock(&logfs_inode_lock);
-	return generic_drop_inode(inode);
-}
-
-static void logfs_set_ino_generation(struct super_block *sb,
-		struct inode *inode)
-{
-	struct logfs_super *super = logfs_super(sb);
-	u64 ino;
-
-	mutex_lock(&super->s_journal_mutex);
-	ino = logfs_seek_hole(super->s_master_inode, super->s_last_ino + 1);
-	super->s_last_ino = ino;
-	super->s_inos_till_wrap--;
-	if (super->s_inos_till_wrap < 0) {
-		super->s_last_ino = LOGFS_RESERVED_INOS;
-		super->s_generation++;
-		super->s_inos_till_wrap = INOS_PER_WRAP;
-	}
-	inode->i_ino = ino;
-	inode->i_generation = super->s_generation;
-	mutex_unlock(&super->s_journal_mutex);
-}
-
-struct inode *logfs_new_inode(struct inode *dir, umode_t mode)
-{
-	struct super_block *sb = dir->i_sb;
-	struct inode *inode;
-
-	inode = new_inode(sb);
-	if (!inode)
-		return ERR_PTR(-ENOMEM);
-
-	logfs_init_inode(sb, inode);
-
-	/* inherit parent flags */
-	logfs_inode(inode)->li_flags |=
-		logfs_inode(dir)->li_flags & LOGFS_FL_INHERITED;
-
-	inode->i_mode = mode;
-	logfs_set_ino_generation(sb, inode);
-
-	inode_init_owner(inode, dir, mode);
-	logfs_inode_setops(inode);
-	insert_inode_hash(inode);
-
-	return inode;
-}
-
-static void logfs_init_once(void *_li)
-{
-	struct logfs_inode *li = _li;
-	int i;
-
-	li->li_flags = 0;
-	li->li_used_bytes = 0;
-	li->li_refcount = 1;
-	for (i = 0; i < LOGFS_EMBEDDED_FIELDS; i++)
-		li->li_data[i] = 0;
-	inode_init_once(&li->vfs_inode);
-}
-
-static int logfs_sync_fs(struct super_block *sb, int wait)
-{
-	logfs_get_wblocks(sb, NULL, WF_LOCK);
-	logfs_write_anchor(sb);
-	logfs_put_wblocks(sb, NULL, WF_LOCK);
-	return 0;
-}
-
-static void logfs_put_super(struct super_block *sb)
-{
-	struct logfs_super *super = logfs_super(sb);
-	/* kill the meta-inodes */
-	iput(super->s_segfile_inode);
-	iput(super->s_master_inode);
-	iput(super->s_mapping_inode);
-}
-
-const struct super_operations logfs_super_operations = {
-	.alloc_inode	= logfs_alloc_inode,
-	.destroy_inode	= logfs_destroy_inode,
-	.evict_inode	= logfs_evict_inode,
-	.drop_inode	= logfs_drop_inode,
-	.put_super	= logfs_put_super,
-	.write_inode	= logfs_write_inode,
-	.statfs		= logfs_statfs,
-	.sync_fs	= logfs_sync_fs,
-};
-
-int logfs_init_inode_cache(void)
-{
-	logfs_inode_cache = kmem_cache_create("logfs_inode_cache",
-			sizeof(struct logfs_inode), 0,
-			SLAB_RECLAIM_ACCOUNT|SLAB_ACCOUNT,
-			logfs_init_once);
-	if (!logfs_inode_cache)
-		return -ENOMEM;
-	return 0;
-}
-
-void logfs_destroy_inode_cache(void)
-{
-	/*
-	 * Make sure all delayed rcu free inodes are flushed before we
-	 * destroy cache.
-	 */
-	rcu_barrier();
-	kmem_cache_destroy(logfs_inode_cache);
-}