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make dump_emit() use vfs_write() instead of banging at ->f_op->write directly

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... and deal with short writes properly - the output might be to pipe, after
all; as it is, e.g. no-MMU case of elf_fdpic coredump can write a whole lot
more than a page worth of data at one call.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2013-10-08 09:11:48 -04:00
parent 1ad67015e6
commit 2507a4fbd4
1 changed files with 12 additions and 5 deletions
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17
fs/coredump.c
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@ -696,13 +696,20 @@ EXPORT_SYMBOL(dump_write);
int dump_emit(struct coredump_params *cprm, const void *addr, int nr)
{
struct file *file = cprm->file;
if (dump_interrupted() || !access_ok(VERIFY_READ, addr, nr))
return 0;
loff_t pos = file->f_pos;
ssize_t n;
if (cprm->written + nr > cprm->limit)
return 0;
if (file->f_op->write(file, addr, nr, &file->f_pos) != nr)
return 0;
cprm->written += nr;
while (nr) {
if (dump_interrupted())
return 0;
n = vfs_write(file, addr, nr, &pos);
if (n <= 0)
return 0;
file->f_pos = pos;
cprm->written += n;
nr -= n;
}
return 1;
}
EXPORT_SYMBOL(dump_emit);