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Date: Tue, 30 Oct 2007 01:03:38 +0800
From: Coly Li <coyli@...e.de>
To: linux-ext4@...r.kernel.org
Subject: [PATCH] e2fsprogs: directory inode reservation (V1) to mke2fs
This patch adds directory inode reservation supporting to mke2fs. Ask for review.
Signed-off-by: Coly Li <coyli@...e.de>
---
lib/ext2fs/ext2_fs.h | 9 ++++++++-
misc/mke2fs.c | 27 ++++++++++++++++++++++++---
2 files changed, 32 insertions(+), 4 deletions(-)
diff --git a/lib/ext2fs/ext2_fs.h b/lib/ext2fs/ext2_fs.h
index a316665..b007a1b 100644
--- a/lib/ext2fs/ext2_fs.h
+++ b/lib/ext2fs/ext2_fs.h
@@ -111,6 +111,13 @@
#endif
/*
+ * Macro-instructions used to reserve inodes for directories
+ */
+#define EXT4_DIR_IRESERVE_LOW 16
+#define EXT4_DIR_IRESERVE_NORMAL 64
+#define EXT4_DIR_IRESERVE_HIGH 128
+
+/*
* ACL structures
*/
struct ext2_acl_header /* Header of Access Control Lists */
@@ -167,7 +174,7 @@ struct ext4_group_desc
__u16 bg_free_blocks_count_hi;/* Free blocks count MSB */
__u16 bg_free_inodes_count_hi;/* Free inodes count MSB */
__u16 bg_used_dirs_count_hi; /* Directories count MSB */
- __u16 bg_pad;
+ __u16 bg_itable_unused_hi; /* Unused inodes count MSB */
__u32 bg_reserved2[3];
};
diff --git a/misc/mke2fs.c b/misc/mke2fs.c
index 4a6cace..fcb4830 100644
--- a/misc/mke2fs.c
+++ b/misc/mke2fs.c
@@ -86,6 +86,7 @@ char *volume_label;
char *mount_dir;
char *journal_device;
int sync_kludge; /* Set using the MKE2FS_SYNC env. option */
+int dir_inodes_reserve = 0;
profile_t profile;
@@ -100,7 +101,8 @@ static void usage(void)
"\t[-N number-of-inodes] [-m reserved-blocks-percentage] "
"[-o creator-os]\n\t[-g blocks-per-group] [-L volume-label] "
"[-M last-mounted-directory]\n\t[-O feature[,...]] "
- "[-r fs-revision] [-R options] [-qvSV]\n\tdevice [blocks-count]\n"),
+ "[-r fs-revision] [-E extended-option[,...]] [-qvSV]\n"
+ "\tdevice [blocks-count]\n"),
program_name);
exit(1);
}
@@ -575,6 +577,16 @@ static void reserve_inodes(ext2_filsys fs)
ext2fs_mark_ib_dirty(fs);
}
+static void setup_itable_unused(ext2_filsys fs)
+{
+ dgrp_t i;
+ int inodes_pgroup = fs->super->s_inodes_per_group;
+ fs->group_desc[0].bg_itable_unused =
+ inodes_pgroup - EXT4_DIR_IRESERVE_NORMAL;
+ for (i = 1; i < fs->group_desc_count; i++)
+ fs->group_desc[i].bg_itable_unused = inodes_pgroup;
+}
+
#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
#define BSD_MAGICDISK (0x57455682UL) /* The disk magic number reversed */
#define BSD_LABEL_OFFSET 64
@@ -761,7 +773,7 @@ static void parse_extended_opts(struct ext2_super_block *param,
int r_usage = 0;
len = strlen(opts);
- buf = malloc(len+1);
+ buf = (char *)malloc(len+1);
if (!buf) {
fprintf(stderr,
_("Couldn't allocate memory to parse options!\n"));
@@ -849,6 +861,12 @@ static void parse_extended_opts(struct ext2_super_block *param,
param->s_reserved_gdt_blocks = rsv_gdb;
}
+ } else if (!strcmp(token, "dir_ireserve")) {
+ if (arg) {
+ r_usage ++;
+ continue;
+ }
+ dir_inodes_reserve = 1;
} else
r_usage++;
}
@@ -859,7 +877,8 @@ static void parse_extended_opts(struct ext2_super_block *param,
"\tis set off by an equals ('=') sign.\n\n"
"Valid extended options are:\n"
"\tstride=<stride length in blocks>\n"
- "\tresize=<resize maximum size in blocks>\n\n"));
+ "\tresize=<resize maximum size in blocks>\n"
+ "\tdir_ireserve\n\n"));
free(buf);
exit(1);
}
@@ -1689,6 +1708,8 @@ int main (int argc, char *argv[])
exit(1);
}
}
+ if (dir_inodes_reserve)
+ setup_itable_unused(fs);
}
if (journal_device) {
--
Coly Li
SuSE PRC Labs
-
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