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virSecurityDACSetOwnershipInternal: Don't chown so often

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It's better if we stat() file that we are about to chown() at
first and check if there's something we need to change. Not that
it would make much difference, but for the upcoming patches we
need to be doing stat() anyway. Moreover, if we do things this
way, we can drop @chown_errno variable which will become
redundant.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
This commit is contained in:
Michal Privoznik 2015-10-07 10:39:17 +02:00
parent d37d8f78c0
commit a0f43d820d
1 changed files with 14 additions and 18 deletions
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32
src/security/security_dac.c
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@ -242,7 +242,6 @@ virSecurityDACSetOwnershipInternal(virSecurityDACDataPtr priv,
gid_t gid)
{
int rc;
int chown_errno;
VIR_INFO("Setting DAC user and group on '%s' to '%ld:%ld'",
NULLSTR(src ? src->path : path), (long) uid, (long) gid);
@ -255,9 +254,6 @@ virSecurityDACSetOwnershipInternal(virSecurityDACDataPtr priv,
/* on -2 returned an error was already reported */
if (rc == -2)
return -1;
/* on -1 only errno was set */
chown_errno = errno;
} else {
struct stat sb;
@ -271,34 +267,34 @@ virSecurityDACSetOwnershipInternal(virSecurityDACDataPtr priv,
path = src->path;
}
rc = chown(path, uid, gid);
chown_errno = errno;
if (rc < 0 &&
stat(path, &sb) >= 0) {
if (sb.st_uid == uid &&
sb.st_gid == gid) {
/* It's alright, there's nothing to change anyway. */
return 0;
}
if (stat(path, &sb) < 0) {
virReportSystemError(errno, _("unable to stat: %s"), path);
return -1;
}
if (sb.st_uid == uid && sb.st_gid == gid) {
/* nothing to chown */
return 0;
}
rc = chown(path, uid, gid);
}
if (rc < 0) {
if (chown_errno == EOPNOTSUPP || chown_errno == EINVAL) {
if (errno == EOPNOTSUPP || errno == EINVAL) {
VIR_INFO("Setting user and group to '%ld:%ld' on '%s' not "
"supported by filesystem",
(long) uid, (long) gid, path);
} else if (chown_errno == EPERM) {
} else if (errno == EPERM) {
VIR_INFO("Setting user and group to '%ld:%ld' on '%s' not "
"permitted",
(long) uid, (long) gid, path);
} else if (chown_errno == EROFS) {
} else if (errno == EROFS) {
VIR_INFO("Setting user and group to '%ld:%ld' on '%s' not "
"possible on readonly filesystem",
(long) uid, (long) gid, path);
} else {
virReportSystemError(chown_errno,
virReportSystemError(errno,
_("unable to set user and group to '%ld:%ld' "
"on '%s'"),
(long) uid, (long) gid, path);