mm: introduce coredump parameter structure

Introduce coredump parameter data structure (struct coredump_params) to
simplify binfmt->core_dump() arguments.

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Suggested-by: Ingo Molnar <mingo@elte.hu>
Cc: Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Roland McGrath <roland@redhat.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 13 insertions, 11 deletions

diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 97b6e9e..edd90c4 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -45,7 +45,7 @@ static unsigned long elf_map(struct file *, unsigned long, struct elf_phdr *,
  * don't even try.
  */
 #ifdef CONFIG_ELF_CORE
-static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file, unsigned long limit);
+static int elf_core_dump(struct coredump_params *cprm);
 #else
 #define elf_core_dump	NULL
 #endif
@@ -1272,8 +1272,9 @@ static int writenote(struct memelfnote *men, struct file *file,
 }
 #undef DUMP_WRITE
 
-#define DUMP_WRITE(addr, nr)	\
-	if ((size += (nr)) > limit || !dump_write(file, (addr), (nr))) \
+#define DUMP_WRITE(addr, nr)				\
+	if ((size += (nr)) > cprm->limit ||		\
+	    !dump_write(cprm->file, (addr), (nr)))	\
 		goto end_coredump;
 
 static void fill_elf_header(struct elfhdr *elf, int segs,
@@ -1901,7 +1902,7 @@ static struct vm_area_struct *next_vma(struct vm_area_struct *this_vma,
  * and then they are actually written out.  If we run out of core limit
  * we just truncate.
  */
-static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file, unsigned long limit)
+static int elf_core_dump(struct coredump_params *cprm)
 {
 	int has_dumped = 0;
 	mm_segment_t fs;
@@ -1947,7 +1948,7 @@ static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file, un
 	 * notes.  This also sets up the file header.
 	 */
 	if (!fill_note_info(elf, segs + 1, /* including notes section */
-			    &info, signr, regs))
+			    &info, cprm->signr, cprm->regs))
 		goto cleanup;
 
 	has_dumped = 1;
@@ -2009,14 +2010,14 @@ static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file, un
 #endif
 
  	/* write out the notes section */
-	if (!write_note_info(&info, file, &foffset))
+	if (!write_note_info(&info, cprm->file, &foffset))
 		goto end_coredump;
 
-	if (elf_coredump_extra_notes_write(file, &foffset))
+	if (elf_coredump_extra_notes_write(cprm->file, &foffset))
 		goto end_coredump;
 
 	/* Align to page */
-	if (!dump_seek(file, dataoff - foffset))
+	if (!dump_seek(cprm->file, dataoff - foffset))
 		goto end_coredump;
 
 	for (vma = first_vma(current, gate_vma); vma != NULL;
@@ -2033,12 +2034,13 @@ static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file, un
 			page = get_dump_page(addr);
 			if (page) {
 				void *kaddr = kmap(page);
-				stop = ((size += PAGE_SIZE) > limit) ||
-					!dump_write(file, kaddr, PAGE_SIZE);
+				stop = ((size += PAGE_SIZE) > cprm->limit) ||
+					!dump_write(cprm->file, kaddr,
+						    PAGE_SIZE);
 				kunmap(page);
 				page_cache_release(page);
 			} else
-				stop = !dump_seek(file, PAGE_SIZE);
+				stop = !dump_seek(cprm->file, PAGE_SIZE);
 			if (stop)
 				goto end_coredump;
 		}