With the new-and-improved write_in_full() semantics, where a partial write
simply always returns a real error (and always sets 'errno' when that
happens, including for the disk full case), a lot of the callers of
write_in_full() were just unnecessarily complex.
In particular, there's no reason to ever check for a zero length or
return: if the length was zero, we'll return zero, otherwise, if a disk
full resulted in the actual write() system call returning zero the
write_in_full() logic would have correctly turned that into a negative
return value, with 'errno' set to ENOSPC.
I really wish every "write_in_full()" user would just check against "<0"
now, but this fixes the nasty and stupid ones.
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
I actually think "read_in_full()" should get the same loving tender care
too, for all the same reasons. I think "read_or_die()" is totally broken.
Anybody who uses "read_or_die()" is buggy by definition, since it will do
a partial read AND NOT RETURN ANY INDICATION THAT IT WAS PARTIAL!
Can I please ask people who do these idiotic cleanups to get their act
together?
I'll send a patch for that next, but I looked at "write_in_full()" first,
for historical reasons.
diff --git a/sha1_file.c b/sha1_file.c
index 18dd89b..2a5be53 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -1618,14 +1618,7 @@ int move_temp_to_file(const char *tmpfile, const char *filename)
static int write_buffer(int fd, const void *buf, size_t len)
{
- ssize_t size;
-
- if (!len)
- return 0;
- size = write_in_full(fd, buf, len);
- if (!size)
- return error("file write: disk full");
- if (size < 0)
+ if (write_in_full(fd, buf, len) < 0)
return error("file write error (%s)", strerror(errno));
return 0;
}
diff --git a/write_or_die.c b/write_or_die.c
index 488de72..1224cac 100644
--- a/write_or_die.c
+++ b/write_or_die.c
@@ -58,14 +58,7 @@ int write_in_full(int fd, const void *buf, size_t count)
void write_or_die(int fd, const void *buf, size_t count)
{
- ssize_t written;
-
- if (!count)
- return;
- written = write_in_full(fd, buf, count);
- if (written == 0)
- die("disk full?");
- else if (written < 0) {
+ if (write_in_full(fd, buf, count) < 0) {
if (errno == EPIPE)
exit(0);
die("write error (%s)", strerror(errno));
@@ -74,16 +67,7 @@ void write_or_die(int fd, const void *buf, size_t count)
int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg)
{
- ssize_t written;
-
- if (!count)
- return 1;
- written = write_in_full(fd, buf, count);
- if (written == 0) {
- fprintf(stderr, "%s: disk full?\n", msg);
- return 0;
- }
- else if (written < 0) {
+ if (write_in_full(fd, buf, count) < 0) {
if (errno == EPIPE)
exit(0);
fprintf(stderr, "%s: write error (%s)\n",
@@ -96,16 +80,7 @@ int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg)
int write_or_whine(int fd, const void *buf, size_t count, const char *msg)
{
- ssize_t written;
-
- if (!count)
- return 1;
- written = write_in_full(fd, buf, count);
- if (written == 0) {
- fprintf(stderr, "%s: disk full?\n", msg);
- return 0;
- }
- else if (written < 0) {
+ if (write_in_full(fd, buf, count) < 0) {
fprintf(stderr, "%s: write error (%s)\n",
msg, strerror(errno));
return 0;
-
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