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ceph: handle -EAGAIN returned by ceph_update_writeable_page()

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when ceph_update_writeable_page() return -EAGAIN, caller should
lock the page and call ceph_update_writeable_page() again.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
This commit is contained in:
Yan, Zheng 2016-05-10 19:09:06 +08:00 committed by Ilya Dryomov
parent 6ce026e411
commit f0b33df57a
1 changed files with 15 additions and 13 deletions
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28
fs/ceph/addr.c
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@ -1475,21 +1475,23 @@ static int ceph_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
/* Update time before taking page lock */
file_update_time(vma->vm_file);
lock_page(page);
do {
lock_page(page);
if ((off > size) || (page->mapping != inode->i_mapping)) {
unlock_page(page);
ret = VM_FAULT_NOPAGE;
goto out;
}
if ((off > size) || (page->mapping != inode->i_mapping)) {
unlock_page(page);
ret = VM_FAULT_NOPAGE;
break;
}
ret = ceph_update_writeable_page(vma->vm_file, off, len, page);
if (ret >= 0) {
/* success. we'll keep the page locked. */
set_page_dirty(page);
ret = VM_FAULT_LOCKED;
}
} while (ret == -EAGAIN);
ret = ceph_update_writeable_page(vma->vm_file, off, len, page);
if (ret >= 0) {
/* success. we'll keep the page locked. */
set_page_dirty(page);
ret = VM_FAULT_LOCKED;
}
out:
if (ret == VM_FAULT_LOCKED ||
ci->i_inline_version != CEPH_INLINE_NONE) {
int dirty;