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[PATCH] tweak node unlink handling

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Based on a patch from Olaf Hering we remove the node now only if the
requested dev_t is different from the already existing node, so any
run of udevstart should preserve the inode number of the node file.

syslog while the right node is already there:
  creating device node '/udev/hda'
  make_node: preserve file '/udev/hda', cause it has correct dev_t
  make_node: chmod(/udev/hda, 060600)

syslog for wrong file already there:
  creating device node '/udev/hda'
  make_node: already present file '/udev/hda' unlinked
  make_node: chmod(/udev/hda, 060600)

syslog for directory with same name already there:
  creating device node '/udev/hda'
  make_node: unlink(/udev/hda) failed with error '21'
This commit is contained in:
kay.sievers@vrfy.org 2004-04-02 22:16:38 -08:00 committed by Greg KH
parent b6bf0b1236
commit 49747bdc37
1 changed files with 29 additions and 33 deletions
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62
udev-add.c
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@ -105,29 +105,46 @@ static int create_path(char *file)
return 0;
}
static int make_node(char *filename, int major, int minor, unsigned int mode, uid_t uid, gid_t gid)
static int make_node(char *file, int major, int minor, unsigned int mode, uid_t uid, gid_t gid)
{
int retval;
struct stat stats;
int retval = 0;
retval = mknod(filename, mode, makedev(major, minor));
if (stat(file, &stats) != 0)
goto create;
/* preserve node with already correct numbers, to not change the inode number */
if (((stats.st_mode & S_IFMT) == S_IFBLK || (stats.st_mode & S_IFMT) == S_IFCHR) &&
(stats.st_rdev == makedev(major, minor))) {
dbg("preserve file '%s', cause it has correct dev_t", file);
goto perms;
}
if (unlink(file) != 0)
dbg("unlink(%s) failed with error '%s'", file, strerror(errno));
else
dbg("already present file '%s' unlinked", file);
create:
retval = mknod(file, mode, makedev(major, minor));
if (retval != 0) {
dbg("mknod(%s, %#o, %u, %u) failed with error '%s'",
filename, mode, major, minor, strerror(errno));
file, mode, major, minor, strerror(errno));
goto exit;
}
dbg("chmod(%s, %#o)", filename, mode);
if (chmod(filename, mode) != 0) {
dbg("chmod(%s, %#o) failed with error '%s'",
filename, mode, strerror(errno));
perms:
dbg("chmod(%s, %#o)", file, mode);
if (chmod(file, mode) != 0) {
dbg("chmod(%s, %#o) failed with error '%s'", file, mode, strerror(errno));
goto exit;
}
if (uid != 0 || gid != 0) {
dbg("chown(%s, %u, %u)", filename, uid, gid);
if (chown(filename, uid, gid) != 0) {
dbg("chown(%s, %u, %u)", file, uid, gid);
if (chown(file, uid, gid) != 0) {
dbg("chown(%s, %u, %u) failed with error '%s'",
filename, uid, gid, strerror(errno));
file, uid, gid, strerror(errno));
goto exit;
}
}
@ -167,23 +184,6 @@ static void set_to_local_user(char *user)
endutent();
}
static int unlink_entry(char *filename)
{
struct stat stats;
int retval = 0;
if (lstat(filename, &stats) == 0) {
if ((stats.st_mode & S_IFMT) != S_IFDIR) {
retval = unlink(filename);
if (retval) {
dbg("unlink(%s) failed with error '%s'",
filename, strerror(errno));
}
}
}
return retval;
}
static int create_node(struct udevice *dev, int fake)
{
char filename[NAME_SIZE];
@ -253,7 +253,6 @@ static int create_node(struct udevice *dev, int fake)
}
if (!fake) {
unlink_entry(filename);
info("creating device node '%s'", filename);
if (make_node(filename, dev->major, dev->minor, dev->mode, uid, gid) != 0)
goto error;
@ -270,7 +269,6 @@ static int create_node(struct udevice *dev, int fake)
for (i = 1; i <= dev->partitions; i++) {
strfieldcpy(partitionname, filename);
strintcat(partitionname, i);
unlink_entry(partitionname);
make_node(partitionname, dev->major,
dev->minor + i, dev->mode, uid, gid);
}
@ -304,11 +302,9 @@ static int create_node(struct udevice *dev, int fake)
strfieldcat(linktarget, &dev->name[tail]);
if (!fake)
unlink_entry(filename);
dbg("symlink(%s, %s)", linktarget, filename);
if (!fake) {
unlink(filename);
if (symlink(linktarget, filename) != 0)
dbg("symlink(%s, %s) failed with error '%s'",
linktarget, filename, strerror(errno));