util-linux/0007-lib-loopdev-improve-debug-messages.patch

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From deb0e659451d4ade29df3dbb842607edd6080c0d Mon Sep 17 00:00:00 2001
From: Karel Zak <kzak@redhat.com>
Date: Wed, 17 Oct 2012 11:42:21 +0200
Subject: [PATCH 07/11] lib/loopdev: improve debug messages
Signed-off-by: Karel Zak <kzak@redhat.com>
---
lib/loopdev.c | 22 ++++++++++++++++++----
sys-utils/losetup.c | 2 --
2 files changed, 18 insertions(+), 6 deletions(-)
diff --git a/lib/loopdev.c b/lib/loopdev.c
index a9f6df2..0e6033a 100644
--- a/lib/loopdev.c
+++ b/lib/loopdev.c
@@ -87,8 +87,10 @@ int loopcxt_set_device(struct loopdev_cxt *lc, const char *device)
if (!lc)
return -EINVAL;
- if (lc->fd >= 0)
+ if (lc->fd >= 0) {
close(lc->fd);
+ DBG(lc, loopdev_debug("closing old open fd"));
+ }
lc->fd = -1;
lc->mode = 0;
lc->has_info = 0;
@@ -158,19 +160,26 @@ int loopcxt_init(struct loopdev_cxt *lc, int flags)
memcpy(lc, &dummy, sizeof(dummy));
lc->flags = flags;
+ if (getenv("LOOPDEV_DEBUG"))
+ loopcxt_enable_debug(lc, TRUE);
+
rc = loopcxt_set_device(lc, NULL);
if (rc)
return rc;
if (!(lc->flags & LOOPDEV_FL_NOSYSFS) &&
- get_linux_version() >= KERNEL_VERSION(2,6,37))
+ get_linux_version() >= KERNEL_VERSION(2,6,37)) {
/*
* Use only sysfs for basic information about loop devices
*/
lc->flags |= LOOPDEV_FL_NOIOCTL;
+ DBG(lc, loopdev_debug("init: ignore ioctls"));
+ }
- if (!(lc->flags & LOOPDEV_FL_CONTROL) && !stat(_PATH_DEV_LOOPCTL, &st))
+ if (!(lc->flags & LOOPDEV_FL_CONTROL) && !stat(_PATH_DEV_LOOPCTL, &st)) {
lc->flags |= LOOPDEV_FL_CONTROL;
+ DBG(lc, loopdev_debug("init: loop-control detected "));
+ }
return 0;
}
@@ -272,7 +281,9 @@ int loopcxt_get_fd(struct loopdev_cxt *lc)
if (lc->fd < 0) {
lc->mode = lc->flags & LOOPDEV_FL_RDWR ? O_RDWR : O_RDONLY;
lc->fd = open(lc->device, lc->mode);
- DBG(lc, loopdev_debug("open %s", lc->fd < 0 ? "failed" : "ok"));
+ DBG(lc, loopdev_debug("open %s [%s]: %s", lc->device,
+ lc->flags & LOOPDEV_FL_RDWR ? "rw" : "ro",
+ lc->fd < 0 ? "failed" : "ok"));
}
return lc->fd;
}
@@ -576,6 +587,7 @@ int loopcxt_next(struct loopdev_cxt *lc)
* of loop devices). This is enough for 99% of all cases.
*/
if (iter->default_check) {
+ DBG(lc, loopdev_debug("iter: next: default check"));
for (++iter->ncur; iter->ncur < LOOPDEV_DEFAULT_NNODES;
iter->ncur++) {
char name[16];
@@ -590,6 +602,7 @@ int loopcxt_next(struct loopdev_cxt *lc)
/* C) the worst possibility, scan whole /dev or /dev/loop/<N>
*/
if (!iter->minors) {
+ DBG(lc, loopdev_debug("iter: next: scan /dev"));
iter->nminors = (lc->flags & LOOPDEV_FL_DEVSUBDIR) ?
loop_scandir(_PATH_DEV_LOOP, &iter->minors, 0) :
loop_scandir(_PATH_DEV, &iter->minors, 1);
@@ -1150,6 +1163,7 @@ int loopcxt_setup_device(struct loopdev_cxt *lc)
DBG(lc, loopdev_debug("setup: backing file open: OK"));
if (lc->fd != -1 && lc->mode != mode) {
+ DBG(lc, loopdev_debug("closing already open device (mode mismatch)"));
close(lc->fd);
lc->fd = -1;
lc->mode = 0;
diff --git a/sys-utils/losetup.c b/sys-utils/losetup.c
index fdcc0be..a8381a8 100644
--- a/sys-utils/losetup.c
+++ b/sys-utils/losetup.c
@@ -250,8 +250,6 @@ int main(int argc, char **argv)
if (loopcxt_init(&lc, 0))
err(EXIT_FAILURE, _("failed to initialize loopcxt"));
- loopcxt_enable_debug(&lc, getenv("LOOPDEV_DEBUG") ? TRUE : FALSE);
-
while ((c = getopt_long(argc, argv, "ac:d:De:E:fhj:o:p:PrvV",
longopts, NULL)) != -1) {
--
1.7.11.7