Implements a new xfs_io command, named 'inode', which is supposed to be
used to query information about inode's existence and its physical size
in the filesystem.
Supported options:
Default: -- Return true(1) or false(0) if any inode greater than
32bits has been found in the filesystem
-v -- verbose mode
Display the number and the physical size (in bits)
of the largest inode in the filesystem
[num] -- Return true(1) or false(0) if the inode [num] is in use
-n [num] -- Return the next valid inode after [num]
No manpage sent because there were changes in the supported options and its
descriptions.
I'll send the manpage after the options and descriptions are reviewed.
- Changelog
V3:
- Merge all 3 patches from the V2 together in a single patch
- Rework of '-n [num]' and 'num' only arguments algorithm
- Argument -n now relies on bulkreq.count to check for next inodes, not
on bstat.bs_ino anymore.
- for loop in ret_lsize or ret_largest case, now relies on count being 0
to break the loop
V4:
- Refactor inode_f function to reduce its size and easier logic
- Implement error handlers for invalid command combination (hopefully
all invalid combinations).
- use a single xfs_inogrp array for keep track of inodes
- Fix missing newline in inode_help()
- Rewrite help message in inode_help()
- Fix indentation
V5:
- Reduce the amount of options
- remove igrp_rec variable, and use igroup[lastgrp] directly to get
information from the last inode groups returned by ioctl
Signed-off-by: Carlos Maiolino <cmaiolino@xxxxxxxxxx>
---
io/open.c | 143 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 143 insertions(+)
diff --git a/io/open.c b/io/open.c
index ac5a5e0..1e38ea8 100644
--- a/io/open.c
+++ b/io/open.c
@@ -20,6 +20,7 @@
#include "input.h"
#include "init.h"
#include "io.h"
+#include "libxfs.h"
#ifndef __O_TMPFILE
#if defined __alpha__
@@ -44,6 +45,7 @@ static cmdinfo_t statfs_cmd;
static cmdinfo_t chproj_cmd;
static cmdinfo_t lsproj_cmd;
static cmdinfo_t extsize_cmd;
+static cmdinfo_t inode_cmd;
static prid_t prid;
static long extsize;
@@ -750,6 +752,136 @@ statfs_f(
return 0;
}
+static void
+inode_help(void)
+{
+ printf(_(
+"\n"
+"Query physical information about the inode"
+"\n"
+" Default: -- Return true(1) or false(0) if any inode greater than\n"
+" 32bits has been found in the filesystem\n"
+" -v -- verbose mode\n"
+" Display the number and the physical size (in bits)\n"
+" of the largest inode in the filesystem\n"
+"[num] -- Return true(1) or false(0) if the inode [num] is in use\n"
+" -n [num] -- Return the next valid inode after [num]\n"
+"\n"));
+}
+
+static int
+inode_f(
+ int argc,
+ char **argv)
+{
+ __s32 count = 0;
+ __s32 lastgrp = 0;
+ __u64 last = 0;
+ __u64 lastino = 0;
+ __u64 userino = 0;
+ char *p;
+ int c;
+ int verbose = 0;
+ int ret_next = 0;
+ int cmd = 0;
+ struct xfs_inogrp igroup[1024];
+ struct xfs_fsop_bulkreq bulkreq;
+ struct xfs_bstat bstat;
+
+ while ((c = getopt(argc, argv, "nv")) != EOF) {
+ switch (c) {
+ case 'v':
+ verbose = 1;
+ break;
+ case 'n':
+ ret_next = 1;
+ break;
+ default:
+ return command_usage(&inode_cmd);
+ }
+ }
+
+ if (ret_next && verbose)
+ return command_usage(&inode_cmd);
+
+ if (optind < argc) {
+ if (verbose)
+ return command_usage(&inode_cmd);
+
+ if (ret_next) {
+ cmd = XFS_IOC_FSBULKSTAT;
+ } else {
+ if (argc > 2)
+ return command_usage(&inode_cmd);
+ else
+ cmd = XFS_IOC_FSBULKSTAT_SINGLE;
+ }
+
+ userino = strtoull(argv[optind], &p, 10);
+ if ((*p != '\0')) {
+ printf(_("[num] must be a numeric value\n"));
+ exitcode = 1;
+ return 0;
+ }
+
+ bulkreq.lastip = &userino;
+ bulkreq.icount = 1;
+ bulkreq.ubuffer = &bstat;
+ bulkreq.ocount = &count;
+
+ if (xfsctl(file->name, file->fd, cmd, &bulkreq)) {
+ if (errno == EINVAL) {
+ if (!ret_next)
+ printf("0\n");
+ } else {
+ perror("xfsctl");
+ }
+ exitcode = 1;
+ return 0;
+ }
+
+ if (ret_next) {
+ printf("%llu\n", bstat.bs_ino);
+ return 0;
+ } else {
+ /* Inode number used*/
+ printf("1\n");
+ return 0;
+ }
+ }
+
+ bulkreq.lastip = &last;
+ bulkreq.icount = 1024; /* User-defined maybe!? */
+ bulkreq.ubuffer = &igroup;
+ bulkreq.ocount = &count;
+
+ for (;;) {
+ if (xfsctl(file->name, file->fd, XFS_IOC_FSINUMBERS,
+ &bulkreq)) {
+ perror("XFS_IOC_FSINUMBERS");
+ exitcode = 1;
+ return 0;
+ }
+
+ if (count == 0)
+ break;
+
+ lastgrp = count;
+ }
+
+ lastgrp--;
+ lastino = igroup[lastgrp].xi_startino +
+ xfs_highbit64(igroup[lastgrp].xi_allocmask);
+
+ if (verbose)
+ printf("%llu:%d\n", lastino,
+ lastino > XFS_MAXINUMBER_32 ? 64 : 32);
+ else
+ printf("%d\n", lastino > XFS_MAXINUMBER_32 ? 1 : 0);
+
+ return 0;
+}
+
void
open_init(void)
{
@@ -815,6 +947,16 @@ open_init(void)
_("get/set preferred extent size (in bytes) for the open file");
extsize_cmd.help = extsize_help;
+ inode_cmd.name = "inode";
+ inode_cmd.cfunc = inode_f;
+ inode_cmd.args = _("[-n | -v] [num]");
+ inode_cmd.argmin = 0;
+ inode_cmd.argmax = 2;
+ inode_cmd.flags = CMD_NOMAP_OK;
+ inode_cmd.oneline =
+ _("Query inode number usage in the filesystem");
+ inode_cmd.help = inode_help;
+
add_command(&open_cmd);
add_command(&stat_cmd);
add_command(&close_cmd);
@@ -822,4 +964,5 @@ open_init(void)
add_command(&chproj_cmd);
add_command(&lsproj_cmd);
add_command(&extsize_cmd);
+ add_command(&inode_cmd);
}
--
2.4.3
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