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[PATCH] Get core dump code to work...

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The file based core dump code was broken by pipe changes - a relative
llseek returns the absolute file position on success, not the relative
one, so dump_seek() always failed when invoked with non-zero current
position.

Only success/failure can be tested with relative lseek, we have to trust
kernel that on success we've got right file offset.  With this fix in
place I have finally real core files instead of 1KB fragments...

Signed-off-by: Petr Vandrovec <petr@vandrovec.name>
[ Cleaned it up a bit while here - use SEEK_CUR instead of hardcoding 1 ]
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Petr Vandrovec 2006-10-13 04:13:16 +02:00 • committed by Linus Torvalds
parent 12e36b2f41
commit 7f14daa19e
1 changed files with 1 additions and 1 deletions
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2
fs/binfmt_elf.c
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@ -1152,7 +1152,7 @@ static int dump_write(struct file *file, const void *addr, int nr)
static int dump_seek(struct file *file, loff_t off) static int dump_seek(struct file *file, loff_t off)
{ {
if (file->f_op->llseek && file->f_op->llseek != no_llseek) { if (file->f_op->llseek && file->f_op->llseek != no_llseek) {
if (file->f_op->llseek(file, off, 1) != off) if (file->f_op->llseek(file, off, SEEK_CUR) < 0)
return 0; return 0;
} else { } else {
char *buf = (char *)get_zeroed_page(GFP_KERNEL); char *buf = (char *)get_zeroed_page(GFP_KERNEL);