diff options
Diffstat (limited to 'mm/filemap.c')
| -rw-r--r-- | mm/filemap.c | 31 |
1 files changed, 24 insertions, 7 deletions
diff --git a/mm/filemap.c b/mm/filemap.c index dea8a38bb2b..8144f87dcbb 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -654,15 +654,32 @@ EXPORT_SYMBOL_GPL(__lock_page_killable); int __lock_page_or_retry(struct page *page, struct mm_struct *mm, unsigned int flags) { - if (!(flags & FAULT_FLAG_ALLOW_RETRY)) { - __lock_page(page); - return 1; - } else { - if (!(flags & FAULT_FLAG_RETRY_NOWAIT)) { - up_read(&mm->mmap_sem); + if (flags & FAULT_FLAG_ALLOW_RETRY) { + /* + * CAUTION! In this case, mmap_sem is not released + * even though return 0. + */ + if (flags & FAULT_FLAG_RETRY_NOWAIT) + return 0; + + up_read(&mm->mmap_sem); + if (flags & FAULT_FLAG_KILLABLE) + wait_on_page_locked_killable(page); + else wait_on_page_locked(page); - } return 0; + } else { + if (flags & FAULT_FLAG_KILLABLE) { + int ret; + + ret = __lock_page_killable(page); + if (ret) { + up_read(&mm->mmap_sem); + return 0; + } + } else + __lock_page(page); + return 1; } } |