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Add lock_page_killable

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This routine is like lock_page, but can be interrupted by a fatal signal

Signed-off-by: Matthew Wilcox <[email protected]>
This commit is contained in:
Matthew Wilcox 2007-12-06 11:18:49 -05:00 • committed by Matthew Wilcox
commit 2687a3569e
2 changed files with 28 additions and 0 deletions
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14
mm/filemap.c
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@ -173,6 +173,12 @@ static int sync_page(void *word)
return 0;
}
static int sync_page_killable(void *word)
{
sync_page(word);
return fatal_signal_pending(current) ? -EINTR : 0;
}
/**
* __filemap_fdatawrite_range - start writeback on mapping dirty pages in range
* @mapping: address space structure to write
@ -577,6 +583,14 @@ void fastcall __lock_page(struct page *page)
}
EXPORT_SYMBOL(__lock_page);
int fastcall __lock_page_killable(struct page *page)
{
DEFINE_WAIT_BIT(wait, &page->flags, PG_locked);
return __wait_on_bit_lock(page_waitqueue(page), &wait,
sync_page_killable, TASK_KILLABLE);
}
/*
* Variant of lock_page that does not require the caller to hold a reference
* on the page's mapping.