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new helper: dump_align()

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dump_skip to given alignment...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2013-10-08 11:05:01 -04:00
parent 7b1f4020d0
commit 22a8cb8248
5 changed files with 15 additions and 17 deletions
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2
arch/powerpc/platforms/cell/spufs/coredump.c
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@ -156,7 +156,7 @@ static int spufs_arch_write_note(struct spu_context *ctx, int i,
if (!dump_emit(cprm, fullname, en.n_namesz))
goto Eio;
if (!dump_skip(cprm, roundup(cprm->written, 4) - cprm->written))
if (!dump_align(cprm, 4))
goto Eio;
do {

10
fs/binfmt_elf.c
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@ -1225,12 +1225,6 @@ static int notesize(struct memelfnote *en)
return sz;
}
static int alignfile(struct coredump_params *cprm)
{
static const char buf[4] = { 0, };
return dump_emit(cprm, buf, roundup(cprm->written, 4) - cprm->written);
}
static int writenote(struct memelfnote *men, struct coredump_params *cprm)
{
struct elf_note en;
@ -1239,8 +1233,8 @@ static int writenote(struct memelfnote *men, struct coredump_params *cprm)
en.n_type = men->type;
return dump_emit(cprm, &en, sizeof(en)) &&
dump_emit(cprm, men->name, en.n_namesz) && alignfile(cprm) &&
dump_emit(cprm, men->data, men->datasz) && alignfile(cprm);
dump_emit(cprm, men->name, en.n_namesz) && dump_align(cprm, 4) &&
dump_emit(cprm, men->data, men->datasz) && dump_align(cprm, 4);
}
static void fill_elf_header(struct elfhdr *elf, int segs,

10
fs/binfmt_elf_fdpic.c
View File

@ -1267,12 +1267,6 @@ static int notesize(struct memelfnote *en)
/* #define DEBUG */
static int alignfile(struct coredump_params *cprm)
{
static const char buf[4] = { 0, };
return dump_emit(cprm, buf, roundup(cprm->written, 4) - cprm->written);
}
static int writenote(struct memelfnote *men, struct coredump_params *cprm)
{
struct elf_note en;
@ -1281,8 +1275,8 @@ static int writenote(struct memelfnote *men, struct coredump_params *cprm)
en.n_type = men->type;
return dump_emit(cprm, &en, sizeof(en)) &&
dump_emit(cprm, men->name, en.n_namesz) && alignfile(cprm) &&
dump_emit(cprm, men->data, men->datasz) && alignfile(cprm);
dump_emit(cprm, men->name, en.n_namesz) && dump_align(cprm, 4) &&
dump_emit(cprm, men->data, men->datasz) && dump_align(cprm, 4);
}
static inline void fill_elf_fdpic_header(struct elfhdr *elf, int segs)

9
fs/coredump.c
View File

@ -728,3 +728,12 @@ int dump_skip(struct coredump_params *cprm, size_t nr)
}
}
EXPORT_SYMBOL(dump_skip);
int dump_align(struct coredump_params *cprm, int align)
{
unsigned mod = cprm->written & (align - 1);
if (align & (align - 1))
return -EINVAL;
return mod ? dump_skip(cprm, align - mod) : 0;
}
EXPORT_SYMBOL(dump_align);

1
include/linux/coredump.h
View File

@ -13,6 +13,7 @@
struct coredump_params;
extern int dump_skip(struct coredump_params *cprm, size_t nr);
extern int dump_emit(struct coredump_params *cprm, const void *addr, int nr);
extern int dump_align(struct coredump_params *cprm, int align);
#ifdef CONFIG_COREDUMP
extern void do_coredump(siginfo_t *siginfo);
#else