From f5fa20078bfc05b554294fe9c5505375d7913e8c Mon Sep 17 00:00:00 2001 From: Theodore Ts'o Date: Mon, 8 May 2006 20:17:26 -0400 Subject: Add support for EXT2_FEATURE_COMPAT_LAZY_BG This feature is initially intended for testing purposes; it allows an ext2/ext3 developer to create very large filesystems using sparse files where most of the block groups are not initialized and so do not require much disk space. Eventually it could be used as a way of speeding up mke2fs and e2fsck for large filesystem, but that would be best done by adding an RO_COMPAT extension to the filesystem to allow the inode table to be lazily initialized on a per-block basis, instead of being entirely initialized or entirely unused on a per-blockgroup basis. Signed-off-by: "Theodore Ts'o" --- debugfs/ChangeLog | 5 +++++ debugfs/debugfs.c | 25 +++++++++++++++++++++++-- 2 files changed, 28 insertions(+), 2 deletions(-) (limited to 'debugfs') diff --git a/debugfs/ChangeLog b/debugfs/ChangeLog index a9fb8a4d..0425d227 100644 --- a/debugfs/ChangeLog +++ b/debugfs/ChangeLog @@ -1,3 +1,8 @@ +2006-05-08 Theodore Tso + + * debugfs.c (do_show_super_stats): Print out the block group flags + if they are set. + 2006-04-27 Theodore Ts'o * htree.c (do_htree_dump, do_dx_hash), ls.c (do_list_dir): Add diff --git a/debugfs/debugfs.c b/debugfs/debugfs.c index 12ef00c2..25d52d75 100644 --- a/debugfs/debugfs.c +++ b/debugfs/debugfs.c @@ -266,13 +266,26 @@ static void print_features(struct ext2_super_block * s, FILE *f) fputs("\n", f); } +static void print_bg_opts(struct ext2_group_desc *gdp, int mask, + const char *str, int *first, FILE *f) +{ + if (gdp->bg_flags & mask) { + if (*first) { + fputs(" [", f); + *first = 0; + } else + fputs(", ", f); + fputs(str, f); + } +} + void do_show_super_stats(int argc, char *argv[]) { dgrp_t i; FILE *out; struct ext2_group_desc *gdp; int c, header_only = 0; - int numdirs = 0; + int numdirs = 0, first; reset_getopt(); while ((c = getopt (argc, argv, "h")) != EOF) { @@ -302,7 +315,7 @@ void do_show_super_stats(int argc, char *argv[]) } gdp = ¤t_fs->group_desc[0]; - for (i = 0; i < current_fs->group_desc_count; i++, gdp++) + for (i = 0; i < current_fs->group_desc_count; i++, gdp++) { fprintf(out, " Group %2d: block bitmap at %u, " "inode bitmap at %u, " "inode table at %u\n" @@ -318,6 +331,14 @@ void do_show_super_stats(int argc, char *argv[]) gdp->bg_used_dirs_count, gdp->bg_used_dirs_count != 1 ? "directories" : "directory"); + first = 1; + print_bg_opts(gdp, EXT2_BG_INODE_UNINIT, "Inode not init", + &first, out); + print_bg_opts(gdp, EXT2_BG_BLOCK_UNINIT, "Block not init", + &first, out); + if (!first) + fputs("]\n", out); + } close_pager(out); return; print_usage: -- cgit v1.2.3