在 2023/2/20 17:39, Shiyang Ruan 写道:
在 2023/2/19 2:27, Matthew Wilcox 写道:
On Sat, Feb 18, 2023 at 09:16:43AM +0800, Shiyang Ruan wrote:
在 2023/2/18 0:14, Matthew Wilcox 写道:
On Fri, Feb 17, 2023 at 02:48:31PM +0000, Shiyang Ruan wrote:
- invalidate_mapping_pages(inode->i_mapping, 0, -1);
- iput(toput_inode);
- toput_inode = inode;
-
- cond_resched();
- spin_lock(&sb->s_inode_list_lock);
- }
- spin_unlock(&sb->s_inode_list_lock);
- iput(toput_inode);
+ super_drop_pagecache(sb, invalidate_inode_pages);
I thought I explained last time that you can do this with
invalidate_mapping_pages() / invalidate_inode_pages2_range() ?
Then you don't need to introduce invalidate_inode_pages().
+void super_drop_pagecache(struct super_block *sb,
+ int (*invalidator)(struct address_space *))
void super_drop_pagecache(struct super_block *sb,
int (*invalidate)(struct address_space *, pgoff_t, pgoff_t))
+ invalidator(inode->i_mapping);
invalidate(inode->i_mapping, 0, -1)
... then all the changes to mm/truncate.c and filemap.h go away.
Yes, I tried as you suggested, but I found that they don't have same
type of
return value.
int invalidate_inode_pages2_range(struct address_space *mapping,
pgoff_t start, pgoff_t end);
unsigned long invalidate_mapping_pages(struct address_space *mapping,
pgoff_t start, pgoff_t end);
Oh, that's annoying. Particularly annoying is that the return value
for invalidate_mapping_pages() is used by fs/inode.c to account for
the number of pages invalidate, and the return value for
invalidate_inode_pages2_range() is used by several filesystems
to know whether an error occurred.
Hm. Shouldn't you be checking for an error from
invalidate_inode_pages2_range()? Seems like it can return -EBUSY for
DAX entries.
With that in mind, the wrapper you actually want to exist is
static int invalidate_inode_pages_range(struct address_space *mapping,
pgoff_t start, pgoff_t end)
{
invalidate_mapping_pages(mapping, start, end);
return 0;
}
Right?
So, I should introduce this wrapper in fs/xfs/xfs_notify_failure.c
Ahh... It's not fs/xfs/xfs_notify_failure.c, should be fs/drop_caches.c.
because it is the only one who calls this wrapper. Ok, got it!
--
Thanks,
Ruan.
