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.
Currently supporting three arguments:
-s -- return physical size of the largest inode
-l -- return the largest inode number allocated and used
-n [num] -- Return the next existing inode after [num], even if [num] is not
allocated/used
[num] -- Return if the inode exists or not.
I didn't send the man page patch because I'm sure I'll get some points to
improve, and I'll write the manpage for the next revision.
- 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
Signed-off-by: Carlos Maiolino <cmaiolino@xxxxxxxxxx>
---
io/open.c | 151 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 151 insertions(+)
diff --git a/io/open.c b/io/open.c
index ac5a5e0..2fc8aab 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 +752,144 @@ statfs_f(
return 0;
}
+static void
+inode_help(void)
+{
+ printf(_(
+"\n"
+"Query physical information about the inode"
+"\n"
+" -l -- Returns the largest inode number in the filesystem\n"
+" -s -- Returns the physical size (in bits) of the\n"
+" largest inode number in the filesystem\n"
+" -n -- Return the next valid inode after [num]\n"
+"[num] Check if the inode [num] is in use\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 ret_lsize = 0;
+ int ret_largest = 0;
+ int ret_next = 0;
+ int cmd = 0;
+ struct xfs_inogrp igroup[1024], igrp_rec;
+ struct xfs_fsop_bulkreq bulkreq;
+ struct xfs_bstat bstat;
+
+
+ while ((c = getopt(argc, argv, "sln")) != EOF) {
+ switch (c) {
+ case 's':
+ ret_lsize = 1;
+ break;
+ case 'l':
+ ret_largest = 1;
+ break;
+ case 'n':
+ ret_next = 1;
+ break;
+ default:
+ return command_usage(&inode_cmd);
+ }
+ }
+
+ if (optind < argc) {
+ if (ret_lsize || ret_largest)
+ return command_usage(&inode_cmd);
+
+ if (ret_next) {
+ if (argc > 3)
+ return command_usage(&inode_cmd);
+ else
+ 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)
+ printf(_("Invalid or unlinked inode\n"));
+ else
+ perror("xfsctl");
+ exitcode = 1;
+ return 0;
+ }
+
+ if (ret_next) {
+ printf(_("Next inode: %llu\n"), bstat.bs_ino);
+ return 0;
+ } else {
+ printf(_("Valid inode: %llu\n"), bstat.bs_ino);
+ return 0;
+ }
+ }
+
+ if (ret_lsize || ret_largest) {
+
+ 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--;
+ igrp_rec = igroup[lastgrp];
+ lastino = igrp_rec.xi_startino +
+ xfs_highbit64(igrp_rec.xi_allocmask);
+
+ if (ret_lsize)
+ printf (_("Largest inode size: %d\n"),
+ lastino > XFS_MAXINUMBER_32 ? 64 : 32);
+ else
+ printf(_("Largest inode: %llu\n"), lastino);
+
+ return 0;
+ }
+
+ return command_usage(&inode_cmd);
+}
+
void
open_init(void)
{
@@ -815,6 +955,16 @@ 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 = _("[-s | -l | -n] [num]");
+ inode_cmd.argmin = 1;
+ 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 +972,5 @@ 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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