The patch titled
Subject: fs: ramfs: file-nommu: add SetPageUptodate()
has been added to the -mm tree. Its filename is
fs-ramfs-file-nommu-add-setpageuptodate.patch
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------------------------------------------------------
From: Bob Liu <lliubbo@xxxxxxxxx>
Subject: fs: ramfs: file-nommu: add SetPageUptodate()
There is a bug in the below scenario for !CONFIG_MMU:
1. create a new file
2. mmap the file and write to it
3. read the file can't get the correct value
Because
sys_read() > generic_file_aio_read() > simple_readpage() > clear_page()
which make the page be zeroed.
Add SetPageUptodate() to ramfs_nommu_expand_for_mapping() so that
generic_file_aio_read() do not call simple_readpage().
Signed-off-by: Bob Liu <lliubbo@xxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Cc: Greg Ungerer <gerg@xxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/ramfs/file-nommu.c | 1 +
1 file changed, 1 insertion(+)
diff -puN fs/ramfs/file-nommu.c~fs-ramfs-file-nommu-add-setpageuptodate fs/ramfs/file-nommu.c
--- a/fs/ramfs/file-nommu.c~fs-ramfs-file-nommu-add-setpageuptodate
+++ a/fs/ramfs/file-nommu.c
@@ -110,6 +110,7 @@ int ramfs_nommu_expand_for_mapping(struc
/* prevent the page from being discarded on memory pressure */
SetPageDirty(page);
+ SetPageUptodate(page);
unlock_page(page);
put_page(page);
_
Subject: Subject: fs: ramfs: file-nommu: add SetPageUptodate()
Patches currently in -mm which might be from lliubbo@xxxxxxxxx are
fs-ramfs-file-nommu-add-setpageuptodate.patch
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