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author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2007-08-28 10:29:36 -0400 |
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committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2007-09-01 10:14:54 -0400 |
commit | 1b3b4a1a2deb7d3e5d66063bd76304d840c966b3 (patch) | |
tree | dfa71fe35420aa18997cabff53afcf3a0db0825a /include/linux/nfs_fs.h | |
parent | 7d1cca72994c0e910ca443076dcfcfd473871dda (diff) | |
download | kernel_samsung_smdk4412-1b3b4a1a2deb7d3e5d66063bd76304d840c966b3.zip kernel_samsung_smdk4412-1b3b4a1a2deb7d3e5d66063bd76304d840c966b3.tar.gz kernel_samsung_smdk4412-1b3b4a1a2deb7d3e5d66063bd76304d840c966b3.tar.bz2 |
NFS: Fix a write request leak in nfs_invalidate_page()
Ryusuke Konishi says:
The recent truncate_complete_page() clears the dirty flag from a page
before calling a_ops->invalidatepage(),
^^^^^^
static void
truncate_complete_page(struct address_space *mapping, struct page *page)
{
...
cancel_dirty_page(page, PAGE_CACHE_SIZE); <--- Inserted here at
kernel 2.6.20
if (PagePrivate(page))
do_invalidatepage(page, 0); ---> will call
a_ops->invalidatepage()
...
}
and this is disturbing nfs_wb_page_priority() from calling
nfs_writepage_locked() that is expected to handle the pending
request (=nfs_page) associated with the page.
int nfs_wb_page_priority(struct inode *inode, struct page *page, int how)
{
...
if (clear_page_dirty_for_io(page)) {
ret = nfs_writepage_locked(page, &wbc);
if (ret < 0)
goto out;
}
...
}
Since truncate_complete_page() will get rid of the page after
a_ops->invalidatepage() returns, the request (=nfs_page) associated
with the page becomes a garbage in nfs_inode->nfs_page_tree.
------------------------
Fix this by ensuring that nfs_wb_page_priority() recognises that it may
also need to clear out non-dirty pages that have an nfs_page associated
with them.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'include/linux/nfs_fs.h')
-rw-r--r-- | include/linux/nfs_fs.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h index 157dcb0..7250eea 100644 --- a/include/linux/nfs_fs.h +++ b/include/linux/nfs_fs.h @@ -431,6 +431,7 @@ extern int nfs_sync_mapping_range(struct address_space *, loff_t, loff_t, int); extern int nfs_wb_all(struct inode *inode); extern int nfs_wb_page(struct inode *inode, struct page* page); extern int nfs_wb_page_priority(struct inode *inode, struct page* page, int how); +extern int nfs_wb_page_cancel(struct inode *inode, struct page* page); #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) extern int nfs_commit_inode(struct inode *, int); extern struct nfs_write_data *nfs_commit_alloc(void); |