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ceph: don't call ceph_update_writeable_page from page_mkwrite

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page_mkwrite should only be called with Uptodate pages, so we should
only need to flush incompatible snap contexts.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Jeff Layton 2020-05-28 14:59:49 -04:00 committed by Ilya Dryomov
parent 18d620f063
commit d45156bf46
1 changed files with 21 additions and 6 deletions
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27
fs/ceph/addr.c
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@ -1300,7 +1300,6 @@ static int context_is_writeable_or_written(struct inode *inode,
/**
* ceph_find_incompatible - find an incompatible context and return it
* @inode: inode associated with page
* @page: page being dirtied
*
* We are only allowed to write into/dirty a page if the page is
@ -1311,8 +1310,9 @@ static int context_is_writeable_or_written(struct inode *inode,
* Must be called with page lock held.
*/
static struct ceph_snap_context *
ceph_find_incompatible(struct inode *inode, struct page *page)
ceph_find_incompatible(struct page *page)
{
struct inode *inode = page->mapping->host;
struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
struct ceph_inode_info *ci = ceph_inode(inode);
@ -1376,7 +1376,7 @@ static int ceph_update_writeable_page(struct file *file,
int r;
retry_locked:
snapc = ceph_find_incompatible(inode, page);
snapc = ceph_find_incompatible(page);
if (snapc) {
if (IS_ERR(snapc)) {
r = PTR_ERR(snapc);
@ -1689,6 +1689,8 @@ static vm_fault_t ceph_page_mkwrite(struct vm_fault *vmf)
inode_inc_iversion_raw(inode);
do {
struct ceph_snap_context *snapc;
lock_page(page);
if (page_mkwrite_check_truncate(page, inode) < 0) {
@ -1697,13 +1699,26 @@ static vm_fault_t ceph_page_mkwrite(struct vm_fault *vmf)
break;
}
err = ceph_update_writeable_page(vma->vm_file, off, len, page);
if (err >= 0) {
snapc = ceph_find_incompatible(page);
if (!snapc) {
/* success. we'll keep the page locked. */
set_page_dirty(page);
ret = VM_FAULT_LOCKED;
break;
}
} while (err == -EAGAIN);
unlock_page(page);
if (IS_ERR(snapc)) {
ret = VM_FAULT_SIGBUS;
break;
}
ceph_queue_writeback(inode);
err = wait_event_killable(ci->i_cap_wq,
context_is_writeable_or_written(inode, snapc));
ceph_put_snap_context(snapc);
} while (err == 0);
if (ret == VM_FAULT_LOCKED ||
ci->i_inline_version != CEPH_INLINE_NONE) {