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o Allow the ``-p'' argument to be specified to initattr, which indicates

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that space for extended attributes should be preallocated, instead of
  using a sparse attribute file.  NOTE: This can result in a really
  large file full of zeros.  However, it can prevent a low disk condition
  from causing an attribute write to fail, which is good for security and
  consistency attributes.

o Unlink the attribute file during initattr if an error occurs -- this is
  alright, as we specify O_CREAT when opening the file.
This commit is contained in:
Robert Watson 2000-04-20 18:31:00 +00:00
parent 9c49fb3c31
commit 2a60effdd8
1 changed files with 46 additions and 8 deletions
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54
usr.sbin/extattrctl/extattrctl.c
View File

@ -32,7 +32,11 @@
#include <sys/types.h>
#include <sys/uio.h>
#include <sys/extattr.h>
#include <sys/param.h>
#include <sys/mount.h>
#include <ufs/ufs/extattr.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
@ -50,8 +54,8 @@ usage(void)
"usage:\n"
" extattrctl start [path]\n"
" extattrctl stop [path]\n"
" extattrctl initattr [-p] [-r [kroa]] [-w [kroa]] [attrsize] "
"[attrfile]\n"
" extattrctl initattr [-p path] [-r [kroa]] [-w [kroa]] "
"[attrsize] [attrfile]\n"
" extattrctl enable [path] [attrname] [attrfile]\n"
" extattrctl disable [path] [attrname]\n");
exit(-1);
@ -85,19 +89,37 @@ extattr_level_from_string(char *string)
}
}
long
num_inodes_by_path(char *path)
{
struct statfs buf;
int error;
error = statfs(path, &buf);
if (error) {
perror("statfs");
return (-1);
}
return (buf.f_files);
}
int
initattr(int argc, char *argv[])
{
struct ufs_extattr_fileheader uef;
int initattr_pflag = 0;
char *fs_path = NULL;
char *zero_buf = NULL;
long loop, num_inodes;
int initattr_rlevel = UFS_EXTATTR_PERM_OWNER;
int initattr_wlevel = UFS_EXTATTR_PERM_OWNER;
int ch, i, error;
while ((ch = getopt(argc, argv, "prw")) != -1)
optind = 0;
while ((ch = getopt(argc, argv, "p:rw")) != -1)
switch (ch) {
case 'p':
initattr_pflag = 1;
fs_path = strdup(optarg);
break;
case 'r':
initattr_rlevel = extattr_level_from_string(optarg);
@ -129,12 +151,28 @@ initattr(int argc, char *argv[])
uef.uef_size = atoi(argv[0]);
if (write(i, &uef, sizeof(uef)) == -1)
error = -1;
else if (initattr_pflag) {
else if (fs_path) {
zero_buf = (char *) (malloc(uef.uef_size));
if (zero_buf == NULL) {
perror("malloc");
unlink(argv[1]);
return (-1);
}
memset(zero_buf, 0, uef.uef_size);
num_inodes = num_inodes_by_path(fs_path);
for (loop = 0; loop < num_inodes; loop++) {
error = write(i, zero_buf, uef.uef_size);
if (error != uef.uef_size) {
perror("write");
unlink(argv[1]);
return (-1);
}
}
}
}
if (i == -1 || error == -1) {
perror("argv[1]");
perror(argv[1]);
unlink(argv[1]);
return (-1);
}