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authorHugh Dickins <hugh.dickins@tiscali.co.uk>2009-09-21 17:03:25 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-22 07:17:40 -0700
commitf3e8fccd06d27773186a0094371daf2d84c79469 (patch)
tree46e652e6ac3588a26c6d3e38ea10274eb3fc2ea8 /fs/binfmt_elf.c
parent1c3aff1ceec2cc86810e2690e67873ff0c505862 (diff)
downloadop-kernel-dev-f3e8fccd06d27773186a0094371daf2d84c79469.zip
op-kernel-dev-f3e8fccd06d27773186a0094371daf2d84c79469.tar.gz
mm: add get_dump_page
In preparation for the next patch, add a simple get_dump_page(addr) interface for the CONFIG_ELF_CORE dumpers to use, instead of calling get_user_pages() directly. They're not interested in errors: they just want to use holes as much as possible, to save space and make sure that the data is aligned where the headers said it would be. Oh, and don't use that horrid DUMP_SEEK(off) macro! Signed-off-by: Hugh Dickins <hugh.dickins@tiscali.co.uk> Acked-by: Rik van Riel <riel@redhat.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Nick Piggin <npiggin@suse.de> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Minchan Kim <minchan.kim@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/binfmt_elf.c')
-rw-r--r--fs/binfmt_elf.c44
1 files changed, 14 insertions, 30 deletions
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 7c1e65d..442d94f 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -1280,9 +1280,6 @@ static int writenote(struct memelfnote *men, struct file *file,
#define DUMP_WRITE(addr, nr) \
if ((size += (nr)) > limit || !dump_write(file, (addr), (nr))) \
goto end_coredump;
-#define DUMP_SEEK(off) \
- if (!dump_seek(file, (off))) \
- goto end_coredump;
static void fill_elf_header(struct elfhdr *elf, int segs,
u16 machine, u32 flags, u8 osabi)
@@ -2016,7 +2013,8 @@ static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file, un
goto end_coredump;
/* Align to page */
- DUMP_SEEK(dataoff - foffset);
+ if (!dump_seek(file, dataoff - foffset))
+ goto end_coredump;
for (vma = first_vma(current, gate_vma); vma != NULL;
vma = next_vma(vma, gate_vma)) {
@@ -2027,33 +2025,19 @@ static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file, un
for (addr = vma->vm_start; addr < end; addr += PAGE_SIZE) {
struct page *page;
- struct vm_area_struct *tmp_vma;
-
- if (get_user_pages(current, current->mm, addr, 1, 0, 1,
- &page, &tmp_vma) <= 0) {
- DUMP_SEEK(PAGE_SIZE);
- } else {
- if (page == ZERO_PAGE(0)) {
- if (!dump_seek(file, PAGE_SIZE)) {
- page_cache_release(page);
- goto end_coredump;
- }
- } else {
- void *kaddr;
- flush_cache_page(tmp_vma, addr,
- page_to_pfn(page));
- kaddr = kmap(page);
- if ((size += PAGE_SIZE) > limit ||
- !dump_write(file, kaddr,
- PAGE_SIZE)) {
- kunmap(page);
- page_cache_release(page);
- goto end_coredump;
- }
- kunmap(page);
- }
+ int stop;
+
+ page = get_dump_page(addr);
+ if (page) {
+ void *kaddr = kmap(page);
+ stop = ((size += PAGE_SIZE) > limit) ||
+ !dump_write(file, kaddr, PAGE_SIZE);
+ kunmap(page);
page_cache_release(page);
- }
+ } else
+ stop = !dump_seek(file, PAGE_SIZE);
+ if (stop)
+ goto end_coredump;
}
}
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