| Message ID | 20110527192334.32105.99904.stgit@elm3c44.beaverton.ibm.com |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
diff --git a/mm/filemap.c b/mm/filemap.c index bcdc393..dac95a2 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -2327,7 +2327,7 @@ struct page *grab_cache_page_write_begin(struct address_space *mapping, repeat: page = find_lock_page(mapping, index); if (page) - return page; + goto found; page = __page_cache_alloc(mapping_gfp_mask(mapping) & ~gfp_notmask); if (!page) @@ -2340,6 +2340,8 @@ repeat: goto repeat; return NULL; } +found: + wait_on_page_writeback(page); return page; } EXPORT_SYMBOL(grab_cache_page_write_begin);
When grabbing a page for a buffered IO write, the mm should wait for writeback on the page to complete so that the page does not become writable during the IO operation. This change is needed to provide page stability during writes for all filesystems. Signed-off-by: Darrick J. Wong <djwong@us.ibm.com> --- mm/filemap.c | 4 +++- 1 files changed, 3 insertions(+), 1 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html