From: Jan Kara <jack@xxxxxxx>
Add option to specify number of reserved inodes in the created
filesystem.
Signed-off-by: Jan Kara <jack@xxxxxxx>
---
misc/mke2fs.8.in | 6 ++++++
misc/mke2fs.c | 40 +++++++++++++++++++++++++++++++++++++++-
2 files changed, 45 insertions(+), 1 deletion(-)
diff --git a/misc/mke2fs.8.in b/misc/mke2fs.8.in
index 40c40d3ed065..4165c0a9d051 100644
--- a/misc/mke2fs.8.in
+++ b/misc/mke2fs.8.in
@@ -384,6 +384,12 @@ Do not attempt to discard blocks at mkfs time.
@QUOTA_MAN_COMMENT@.B quota
@QUOTA_MAN_COMMENT@feature is set. Without this extended option, the default
@QUOTA_MAN_COMMENT@behavior is to initialize both user and group quotas.
+.TP
+.BI reserved_inodes= number
+Specify the number of inodes reserved for system files. This number must be
+at least 10. Currently 10 is enough but future features may require additional
+reserved inodes. Reserving more inodes after the file system is created
+requires full file system scan which can take a long time.
.RE
.TP
.BI \-f " fragment-size"
diff --git a/misc/mke2fs.c b/misc/mke2fs.c
index 78b1252d8519..d61d1a332e67 100644
--- a/misc/mke2fs.c
+++ b/misc/mke2fs.c
@@ -1024,6 +1024,34 @@ static void parse_extended_opts(struct ext2_super_block *param,
r_usage++;
continue;
}
+ } else if (!strcmp(token, "reserved_inodes")) {
+ unsigned int reserved_inodes;
+
+ if (!arg) {
+ r_usage++;
+ badopt = token;
+ continue;
+ }
+ reserved_inodes = strtoul(arg, &p, 0);
+ if (*p) {
+ fprintf(stderr,
+ _("Invalid number of reserved inodes "
+ "%s\n"),
+ arg);
+ r_usage++;
+ continue;
+ }
+ /* Ino 0 is invalid so bump by 1... */
+ reserved_inodes++;
+ if (reserved_inodes < EXT2_GOOD_OLD_FIRST_INO) {
+ fprintf(stderr,
+ _("Too few reserved inodes "
+ "%s (must be at least %u)\n"),
+ arg, EXT2_GOOD_OLD_FIRST_INO - 1);
+ r_usage++;
+ continue;
+ }
+ param->s_first_ino = reserved_inodes;
} else {
r_usage++;
badopt = token;
@@ -1049,7 +1077,8 @@ static void parse_extended_opts(struct ext2_super_block *param,
"\ttest_fs\n"
"\tdiscard\n"
"\tnodiscard\n"
- "\tquotatype=<usr OR grp>\n\n"),
+ "\tquotatype=<usr OR grp>\n"
+ "\treserved_inodes=<number of reserved inodes>\n\n"),
badopt ? badopt : "");
free(buf);
exit(1);
@@ -2422,6 +2451,15 @@ profile_error:
exit(1);
}
+ /* Count with one more inode for lost+found */
+ if (fs_param.s_first_ino >= fs_param.s_inodes_count + 1) {
+ com_err(program_name, 0, _("asked for more reserved inodes than filesystem has "
+ "available (%u >= %u)\n"),
+ (unsigned int)fs_param.s_first_ino,
+ (unsigned int)fs_param.s_inodes_count + 1);
+ exit(1);
+ }
+
/*
* Calculate number of blocks to reserve
*/
--
2.1.4
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