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Fix vn_open/vn_rdwr error handling 

1) In vn_open(), if fstat64() returned an error, the real errno
was being obscured by calling close().

2) Add error handling for both pwrite64() calls in vn_rdwr().

Signed-off-by: Ricardo M. Correia <Ricardo.M.Correia@Sun.COM>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Ricardo M. Correia 2010-08-26 10:21:44 -07:00 committed by Brian Behlendorf
parent 235db0acea
commit 4d58b69de8
1 changed files with 17 additions and 9 deletions
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26
lib/libzpool/kernel.c
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@ -328,6 +328,7 @@ vn_open(char *path, int x1, int flags, int mode, vnode_t **vpp, int x2, int x3)
int old_umask;
char realpath[MAXPATHLEN];
struct stat64 st;
int err;
/*
* If we're accessing a real disk from userland, we need to use
@ -376,8 +377,9 @@ vn_open(char *path, int x1, int flags, int mode, vnode_t **vpp, int x2, int x3)
return (errno);
if (fstat64(fd, &st) == -1) {
err = errno;
close(fd);
return (errno);
return (err);
}
(void) fcntl(fd, F_SETFD, FD_CLOEXEC);
@ -415,26 +417,32 @@ int
vn_rdwr(int uio, vnode_t *vp, void *addr, ssize_t len, offset_t offset,
int x1, int x2, rlim64_t x3, void *x4, ssize_t *residp)
{
ssize_t iolen, split;
ssize_t rc, done = 0, split;
if (uio == UIO_READ) {
iolen = pread64(vp->v_fd, addr, len, offset);
rc = pread64(vp->v_fd, addr, len, offset);
} else {
/*
* To simulate partial disk writes, we split writes into two
* system calls so that the process can be killed in between.
*/
split = (len > 0 ? rand() % len : 0);
iolen = pwrite64(vp->v_fd, addr, split, offset);
iolen += pwrite64(vp->v_fd, (char *)addr + split,
len - split, offset + split);
rc = pwrite64(vp->v_fd, addr, split, offset);
if (rc != -1) {
done = rc;
rc = pwrite64(vp->v_fd, (char *)addr + split,
len - split, offset + split);
}
}
if (iolen == -1)
if (rc == -1)
return (errno);
done += rc;
if (residp)
*residp = len - iolen;
else if (iolen != len)
*residp = len - done;
else if (done != len)
return (EIO);
return (0);
}