Commit 45321ac5 authored by Al Viro's avatar Al Viro
Browse files

Make ->drop_inode() just return whether inode needs to be dropped



... and let iput_final() do the actual eviction or retention
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 30140837
......@@ -1223,7 +1223,7 @@ void pohmelfs_fill_inode(struct inode *inode, struct netfs_inode_info *info)
}
}
static void pohmelfs_drop_inode(struct inode *inode)
static int pohmelfs_drop_inode(struct inode *inode)
{
struct pohmelfs_sb *psb = POHMELFS_SB(inode->i_sb);
struct pohmelfs_inode *pi = POHMELFS_I(inode);
......@@ -1232,7 +1232,7 @@ static void pohmelfs_drop_inode(struct inode *inode)
list_del_init(&pi->inode_entry);
spin_unlock(&psb->ino_lock);
generic_drop_inode(inode);
return generic_drop_inode(inode);
}
static struct pohmelfs_inode *pohmelfs_get_inode_from_list(struct pohmelfs_sb *psb,
......
......@@ -2395,7 +2395,7 @@ int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
void btrfs_dirty_inode(struct inode *inode);
struct inode *btrfs_alloc_inode(struct super_block *sb);
void btrfs_destroy_inode(struct inode *inode);
void btrfs_drop_inode(struct inode *inode);
int btrfs_drop_inode(struct inode *inode);
int btrfs_init_cachep(void);
void btrfs_destroy_cachep(void);
long btrfs_ioctl_trans_end(struct file *file);
......
......@@ -3943,7 +3943,7 @@ int btrfs_invalidate_inodes(struct btrfs_root *root)
if (atomic_read(&inode->i_count) > 1)
d_prune_aliases(inode);
/*
* btrfs_drop_inode will remove it from
* btrfs_drop_inode will have it removed from
* the inode cache when its usage count
* hits zero.
*/
......@@ -6337,13 +6337,14 @@ void btrfs_destroy_inode(struct inode *inode)
kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
}
void btrfs_drop_inode(struct inode *inode)
int btrfs_drop_inode(struct inode *inode)
{
struct btrfs_root *root = BTRFS_I(inode)->root;
if (inode->i_nlink > 0 && btrfs_root_refs(&root->root_item) == 0)
generic_delete_inode(inode);
if (btrfs_root_refs(&root->root_item) == 0)
return 1;
else
generic_drop_inode(inode);
return generic_drop_inode(inode);
}
static void init_once(void *foo)
......
......@@ -480,14 +480,13 @@ static int cifs_remount(struct super_block *sb, int *flags, char *data)
return 0;
}
void cifs_drop_inode(struct inode *inode)
static int cifs_drop_inode(struct inode *inode)
{
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
return generic_drop_inode(inode);
return generic_delete_inode(inode);
/* no serverino => unconditional eviction */
return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
generic_drop_inode(inode);
}
static const struct super_operations cifs_super_ops = {
......
......@@ -1191,7 +1191,7 @@ static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
* node for later deallocation.
*/
static void gfs2_drop_inode(struct inode *inode)
static int gfs2_drop_inode(struct inode *inode)
{
struct gfs2_inode *ip = GFS2_I(inode);
......@@ -1200,7 +1200,7 @@ static void gfs2_drop_inode(struct inode *inode)
if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags))
clear_nlink(inode);
}
generic_drop_inode(inode);
return generic_drop_inode(inode);
}
static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
......
......@@ -1183,58 +1183,51 @@ void remove_inode_hash(struct inode *inode)
}
EXPORT_SYMBOL(remove_inode_hash);
int generic_delete_inode(struct inode *inode)
{
return 1;
}
EXPORT_SYMBOL(generic_delete_inode);
/*
* Tell the filesystem that this inode is no longer of any interest and should
* be completely destroyed.
*
* We leave the inode in the inode hash table until *after* the filesystem's
* ->delete_inode completes. This ensures that an iget (such as nfsd might
* instigate) will always find up-to-date information either in the hash or on
* disk.
*
* I_FREEING is set so that no-one will take a new reference to the inode while
* it is being deleted.
* Normal UNIX filesystem behaviour: delete the
* inode when the usage count drops to zero, and
* i_nlink is zero.
*/
void generic_delete_inode(struct inode *inode)
int generic_drop_inode(struct inode *inode)
{
list_del_init(&inode->i_list);
list_del_init(&inode->i_sb_list);
WARN_ON(inode->i_state & I_NEW);
inode->i_state |= I_FREEING;
inodes_stat.nr_inodes--;
spin_unlock(&inode_lock);
evict(inode);
spin_lock(&inode_lock);
hlist_del_init(&inode->i_hash);
spin_unlock(&inode_lock);
wake_up_inode(inode);
BUG_ON(inode->i_state != (I_FREEING | I_CLEAR));
destroy_inode(inode);
return !inode->i_nlink || hlist_unhashed(&inode->i_hash);
}
EXPORT_SYMBOL(generic_delete_inode);
EXPORT_SYMBOL_GPL(generic_drop_inode);
/**
* generic_detach_inode - remove inode from inode lists
* @inode: inode to remove
*
* Remove inode from inode lists, write it if it's dirty. This is just an
* internal VFS helper exported for hugetlbfs. Do not use!
/*
* Called when we're dropping the last reference
* to an inode.
*
* Returns 1 if inode should be completely destroyed.
* Call the FS "drop_inode()" function, defaulting to
* the legacy UNIX filesystem behaviour. If it tells
* us to evict inode, do so. Otherwise, retain inode
* in cache if fs is alive, sync and evict if fs is
* shutting down.
*/
static int generic_detach_inode(struct inode *inode)
static void iput_final(struct inode *inode)
{
struct super_block *sb = inode->i_sb;
const struct super_operations *op = inode->i_sb->s_op;
int drop;
if (op && op->drop_inode)
drop = op->drop_inode(inode);
else
drop = generic_drop_inode(inode);
if (!hlist_unhashed(&inode->i_hash)) {
if (!drop) {
if (!(inode->i_state & (I_DIRTY|I_SYNC)))
list_move(&inode->i_list, &inode_unused);
inodes_stat.nr_unused++;
if (sb->s_flags & MS_ACTIVE) {
spin_unlock(&inode_lock);
return 0;
return;
}
WARN_ON(inode->i_state & I_NEW);
inode->i_state |= I_WILL_FREE;
......@@ -1252,53 +1245,15 @@ static int generic_detach_inode(struct inode *inode)
inode->i_state |= I_FREEING;
inodes_stat.nr_inodes--;
spin_unlock(&inode_lock);
return 1;
}
static void generic_forget_inode(struct inode *inode)
{
if (!generic_detach_inode(inode))
return;
evict(inode);
spin_lock(&inode_lock);
hlist_del_init(&inode->i_hash);
spin_unlock(&inode_lock);
wake_up_inode(inode);
BUG_ON(inode->i_state != (I_FREEING | I_CLEAR));
destroy_inode(inode);
}
/*
* Normal UNIX filesystem behaviour: delete the
* inode when the usage count drops to zero, and
* i_nlink is zero.
*/
void generic_drop_inode(struct inode *inode)
{
if (!inode->i_nlink)
generic_delete_inode(inode);
else
generic_forget_inode(inode);
}
EXPORT_SYMBOL_GPL(generic_drop_inode);
/*
* Called when we're dropping the last reference
* to an inode.
*
* Call the FS "drop()" function, defaulting to
* the legacy UNIX filesystem behaviour..
*
* NOTE! NOTE! NOTE! We're called with the inode lock
* held, and the drop function is supposed to release
* the lock!
*/
static inline void iput_final(struct inode *inode)
{
const struct super_operations *op = inode->i_sb->s_op;
void (*drop)(struct inode *) = generic_drop_inode;
if (op && op->drop_inode)
drop = op->drop_inode;
drop(inode);
}
/**
* iput - put an inode
* @inode: inode to put
......
......@@ -287,7 +287,7 @@ static int logfs_write_inode(struct inode *inode, struct writeback_control *wbc)
}
/* called with inode_lock held */
static void logfs_drop_inode(struct inode *inode)
static int logfs_drop_inode(struct inode *inode)
{
struct logfs_super *super = logfs_super(inode->i_sb);
struct logfs_inode *li = logfs_inode(inode);
......@@ -295,7 +295,7 @@ static void logfs_drop_inode(struct inode *inode)
spin_lock(&logfs_inode_lock);
list_move(&li->li_freeing_list, &super->s_freeing_list);
spin_unlock(&logfs_inode_lock);
generic_drop_inode(inode);
return generic_drop_inode(inode);
}
static void logfs_set_ino_generation(struct super_block *sb,
......
......@@ -1194,9 +1194,10 @@ void ocfs2_evict_inode(struct inode *inode)
/* Called under inode_lock, with no more references on the
* struct inode, so it's safe here to check the flags field
* and to manipulate i_nlink without any other locks. */
void ocfs2_drop_inode(struct inode *inode)
int ocfs2_drop_inode(struct inode *inode)
{
struct ocfs2_inode_info *oi = OCFS2_I(inode);
int res;
mlog_entry_void();
......@@ -1204,11 +1205,12 @@ void ocfs2_drop_inode(struct inode *inode)
(unsigned long long)oi->ip_blkno, inode->i_nlink, oi->ip_flags);
if (oi->ip_flags & OCFS2_INODE_MAYBE_ORPHANED)
generic_delete_inode(inode);
res = 1;
else
generic_drop_inode(inode);
res = generic_drop_inode(inode);
mlog_exit_void();
return res;
}
/*
......
......@@ -124,7 +124,7 @@ static inline struct ocfs2_caching_info *INODE_CACHE(struct inode *inode)
}
void ocfs2_evict_inode(struct inode *inode);
void ocfs2_drop_inode(struct inode *inode);
int ocfs2_drop_inode(struct inode *inode);
/* Flags for ocfs2_iget() */
#define OCFS2_FI_FLAG_SYSFILE 0x1
......
......@@ -1562,7 +1562,7 @@ struct super_operations {
void (*dirty_inode) (struct inode *);
int (*write_inode) (struct inode *, struct writeback_control *wbc);
void (*drop_inode) (struct inode *);
int (*drop_inode) (struct inode *);
void (*evict_inode) (struct inode *);
void (*put_super) (struct super_block *);
void (*write_super) (struct super_block *);
......@@ -2164,8 +2164,8 @@ extern void iput(struct inode *);
extern struct inode * igrab(struct inode *);
extern ino_t iunique(struct super_block *, ino_t);
extern int inode_needs_sync(struct inode *inode);
extern void generic_delete_inode(struct inode *inode);
extern void generic_drop_inode(struct inode *inode);
extern int generic_delete_inode(struct inode *inode);
extern int generic_drop_inode(struct inode *inode);
extern struct inode *ilookup5_nowait(struct super_block *sb,
unsigned long hashval, int (*test)(struct inode *, void *),
......
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