android/android_kernel_asus_sm8350
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ceph: fix file offset wrapping at 4GB on 32-bit archs

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Cast the value before shifting so that we don't run out of bits with a
32-bit unsigned long.  This fixes wrapping of high file offsets into the
low 4GB of a file on disk, and the subsequent data corruption for large
files.

Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Sage Weil 2010-09-11 10:55:25 -07:00
parent 3612abbd5d
commit a77d9f7dce
1 changed files with 2 additions and 1 deletions
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3
fs/ceph/addr.c
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@ -766,7 +766,8 @@ static int ceph_writepages_start(struct address_space *mapping,
/* ok */ /* ok */
if (locked_pages == 0) { if (locked_pages == 0) {
/* prepare async write request */ /* prepare async write request */
offset = page->index << PAGE_CACHE_SHIFT; offset = (unsigned long long)page->index
<< PAGE_CACHE_SHIFT;
len = wsize; len = wsize;
req = ceph_osdc_new_request(&client->osdc, req = ceph_osdc_new_request(&client->osdc,
&ci->i_layout, &ci->i_layout,