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new helper: end_writeback()

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Essentially, the minimal variant of ->evict_inode().  It's
a trimmed-down clear_inode(), sans any fs callbacks.  Once
it returns we know that no async writeback will be happening;
every ->evict_inode() instance should do that once and do that
before doing anything ->write_inode() could interfere with
(e.g. freeing the on-disk inode).

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2010-06-04 20:55:25 -04:00
parent 661074e91b
commit b0683aa638
3 changed files with 14 additions and 1 deletions
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2
fs/hugetlbfs/inode.c
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@ -374,7 +374,7 @@ static void truncate_hugepages(struct inode *inode, loff_t lstart)
static void hugetlbfs_evict_inode(struct inode *inode) static void hugetlbfs_evict_inode(struct inode *inode)
{ {
truncate_hugepages(inode, 0); truncate_hugepages(inode, 0);
clear_inode(inode); end_writeback(inode);
} }
static inline void static inline void

12
fs/inode.c
View File

@ -294,6 +294,18 @@ void __iget(struct inode *inode)
inodes_stat.nr_unused--; inodes_stat.nr_unused--;
} }
void end_writeback(struct inode *inode)
{
might_sleep();
BUG_ON(inode->i_data.nrpages);
BUG_ON(!list_empty(&inode->i_data.private_list));
BUG_ON(!(inode->i_state & I_FREEING));
BUG_ON(inode->i_state & I_CLEAR);
inode_sync_wait(inode);
inode->i_state = I_FREEING | I_CLEAR;
}
EXPORT_SYMBOL(end_writeback);
/** /**
* clear_inode - clear an inode * clear_inode - clear an inode
* @inode: inode to clear * @inode: inode to clear

1
include/linux/fs.h
View File

@ -2184,6 +2184,7 @@ extern void unlock_new_inode(struct inode *);
extern void __iget(struct inode * inode); extern void __iget(struct inode * inode);
extern void iget_failed(struct inode *); extern void iget_failed(struct inode *);
extern void clear_inode(struct inode *); extern void clear_inode(struct inode *);
extern void end_writeback(struct inode *);
extern void destroy_inode(struct inode *); extern void destroy_inode(struct inode *);
extern void __destroy_inode(struct inode *); extern void __destroy_inode(struct inode *);
extern struct inode *new_inode(struct super_block *); extern struct inode *new_inode(struct super_block *);