summaryrefslogtreecommitdiff
path: root/mm/filemap.c
diff options
context:
space:
mode:
authorOleg Nesterov <oleg@tv-sign.ru>2008-06-08 21:20:43 +0400
committerIngo Molnar <mingo@elte.hu>2008-10-14 17:15:33 +0200
commit85462323555dda749f1c5373a8d72679464c968d (patch)
treeaeec1f9a2ad6665c70a88483cbe5e9a3a2f33536 /mm/filemap.c
parent7591103c08abade60aeddb432ed0686ddd0de1c6 (diff)
downloadconfigs-85462323555dda749f1c5373a8d72679464c968d.tar.gz
do_generic_file_read: s/EINTR/EIO/ if lock_page_killable() fails
If lock_page_killable() fails because the task was killed by SIGKILL or any other fatal signal, do_generic_file_read() returns -EIO. This seems to be OK, because in fact the userspace won't see this error, the task will dequeue SIGKILL and exit. However, /sbin/init is different, it will dequeue SIGKILL, ignore it, and return to the user-space with the bogus -EIO. Change the code to return the error code from lock_page_killable(), -EINTR. This doesn't fix the bug, but perhaps makes sense anyway. Imho, with this change the code looks a bit more logical, and the "good" init should handle the spurious EINTR or short read. Afaics we can also change lock_page_killable() to return -ERESTARTNOINTR, but this can't prevent the short reads. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'mm/filemap.c')
-rw-r--r--mm/filemap.c15
1 files changed, 8 insertions, 7 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index 876bc595d0f..494ff20b6cf 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1100,8 +1100,9 @@ page_ok:
page_not_up_to_date:
/* Get exclusive access to the page ... */
- if (lock_page_killable(page))
- goto readpage_eio;
+ error = lock_page_killable(page);
+ if (unlikely(error))
+ goto readpage_error;
page_not_up_to_date_locked:
/* Did it get truncated before we got the lock? */
@@ -1130,8 +1131,9 @@ readpage:
}
if (!PageUptodate(page)) {
- if (lock_page_killable(page))
- goto readpage_eio;
+ error = lock_page_killable(page);
+ if (unlikely(error))
+ goto readpage_error;
if (!PageUptodate(page)) {
if (page->mapping == NULL) {
/*
@@ -1143,15 +1145,14 @@ readpage:
}
unlock_page(page);
shrink_readahead_size_eio(filp, ra);
- goto readpage_eio;
+ error = -EIO;
+ goto readpage_error;
}
unlock_page(page);
}
goto page_ok;
-readpage_eio:
- error = -EIO;
readpage_error:
/* UHHUH! A synchronous read error occurred. Report it */
desc->error = error;