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Date: Sun, 23 Oct 2011 15:21:26 +0800
From: Yongqiang Yang <xiaoqiangnk@...il.com>
To: linux-ext4@...r.kernel.org
Cc: amir73il@...rs.sf.net, Yongqiang Yang <xiaoqiangnk@...il.com>
Subject: [PATCH 6/8] e2fsprogs: add exclude bitmap support in tune2fs
Exclude bitmap is a feature needed by ext4 snapshot. This patch
adds exclude bitmap support in tune2fs.
Signed-off-by: Yongqiang Yang <xiaoqiangnk@...il.com>
---
misc/tune2fs.c | 139 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 136 insertions(+), 3 deletions(-)
diff --git a/misc/tune2fs.c b/misc/tune2fs.c
index e2fdb4a..02edcd6 100644
--- a/misc/tune2fs.c
+++ b/misc/tune2fs.c
@@ -129,7 +129,9 @@ static void usage(void)
static __u32 ok_features[3] = {
/* Compat */
EXT3_FEATURE_COMPAT_HAS_JOURNAL |
- EXT2_FEATURE_COMPAT_DIR_INDEX,
+ EXT2_FEATURE_COMPAT_DIR_INDEX |
+ EXT2_FEATURE_COMPAT_EXCLUDE_BITMAP,
+
/* Incompat */
EXT2_FEATURE_INCOMPAT_FILETYPE |
EXT3_FEATURE_INCOMPAT_EXTENTS |
@@ -149,7 +151,8 @@ static __u32 clear_ok_features[3] = {
/* Compat */
EXT3_FEATURE_COMPAT_HAS_JOURNAL |
EXT2_FEATURE_COMPAT_RESIZE_INODE |
- EXT2_FEATURE_COMPAT_DIR_INDEX,
+ EXT2_FEATURE_COMPAT_DIR_INDEX |
+ EXT2_FEATURE_COMPAT_EXCLUDE_BITMAP,
/* Incompat */
EXT2_FEATURE_INCOMPAT_FILETYPE |
EXT4_FEATURE_INCOMPAT_FLEX_BG |
@@ -288,6 +291,81 @@ static int release_blocks_proc(ext2_filsys fs, blk64_t *blocknr,
}
/*
+ * Add exclude bitmaps to the filesystem
+ */
+static void add_exclude_bitmaps(ext2_filsys fs)
+{
+ char *buf = 0;
+ int retval, i;
+
+ retval = ext2fs_get_mem(strlen(fs->device_name) + 80, &buf);
+ if (retval) {
+ fputs(_("Allocating memory failed.\n"), stderr);
+ exit(1);
+ }
+ strcpy(buf, "exclude bitmap for ");
+ strcat(buf, fs->device_name);
+
+ retval = ext2fs_allocate_exclude_bitmap(fs, buf,
+ &fs->exclude_map);
+ ext2fs_free_mem(&buf);
+ if (retval) {
+ fputs(_("Allocating exclude bitmap failed.\n"), stderr);
+ exit(1);
+ }
+
+ retval = ext2fs_read_block_bitmap(fs);
+ if (retval) {
+ ext2fs_free_exclude_bitmap(fs->exclude_map);
+ fputs(_("Reading block bitmap failed.\n"), stderr);
+ exit(1);
+ }
+
+ retval = ext2fs_allocate_tables(fs);
+ if (retval) {
+ ext2fs_free_exclude_bitmap(fs->exclude_map);
+ fputs(_("Allocating filesystem exclude bitmaps "
+ "failed.\n"), stderr);
+ exit(1);
+ }
+ fs->flags &= ~EXT2_FLAG_SUPER_ONLY;
+ ext2fs_mark_bb_dirty(fs);
+ ext2fs_mark_eb_dirty(fs);
+ ext2fs_mark_super_dirty(fs);
+}
+
+/*
+ * Remove the exclude bitmaps from the filesystem
+ */
+static void remove_exclude_bitmaps(ext2_filsys fs)
+{
+ struct ext2_group_desc *gd;
+ int retval, i;
+
+ retval = ext2fs_read_block_bitmap(fs);
+ if (retval) {
+ fputs(_("Reading block bitmap failed.\n"), stderr);
+ exit(1);
+ }
+
+ for (i = 0; i < fs->group_desc_count; i++) {
+ blk64_t exclude_bitmap;
+ gd = ext2fs_group_desc(fs, fs->group_desc, i);
+ exclude_bitmap = ext2fs_exclude_bitmap_loc(fs, i);
+ release_blocks_proc(fs, &exclude_bitmap, 0, 0, 0, NULL);
+ ext2fs_exclude_bitmap_loc_set(fs, i, 0);
+ ext2fs_bg_flags_clear(fs, i, EXT2_BG_EXCLUDE_UNINIT);
+ if(EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
+ EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
+ ext2fs_group_desc_csum_set(fs, i);
+ }
+
+ fs->flags &= ~EXT2_FLAG_SUPER_ONLY;
+ ext2fs_mark_bb_dirty(fs);
+ ext2fs_mark_super_dirty(fs);
+}
+
+/*
* Remove the journal inode from the filesystem
*/
static errcode_t remove_journal_inode(ext2_filsys fs)
@@ -363,6 +441,32 @@ static void request_fsck_afterwards(ext2_filsys fs)
printf(_("(and reboot afterwards!)\n"));
}
+static int verify_clean_fs(ext2_filsys fs, int compat, unsigned int mask,
+ int on)
+{
+ struct ext2_super_block *sb= fs->super;
+
+ if ((mount_flags & EXT2_MF_MOUNTED) &&
+ !(mount_flags & EXT2_MF_READONLY)) {
+ fprintf(stderr, _("The '%s' feature may only be "
+ "%s when the filesystem is\n"
+ "unmounted or mounted read-only.\n"),
+ e2p_feature2string(compat, mask),
+ on ? "set" : "cleared");
+ exit(1);
+ }
+ if (sb->s_feature_incompat &
+ EXT3_FEATURE_INCOMPAT_RECOVER) {
+ fprintf(stderr, _("The needs_recovery flag is set. "
+ "Please run e2fsck before %s\n"
+ "the '%s' flag.\n"),
+ on ? "setting" : "clearing",
+ e2p_feature2string(compat, mask));
+ exit(1);
+ }
+ return 1;
+}
+
/*
* Update the feature set as provided by the user.
*/
@@ -380,6 +484,10 @@ static int update_feature_set(ext2_filsys fs, char *features)
!((&sb->s_feature_compat)[(type)] & (mask)))
#define FEATURE_CHANGED(type, mask) ((mask) & \
(old_features[(type)] ^ (&sb->s_feature_compat)[(type)]))
+#define FEATURE_ON_SAFE(compat, mask) \
+ (FEATURE_ON(compat, mask) && verify_clean_fs(fs, compat, mask, 1))
+#define FEATURE_OFF_SAFE(compat, mask) \
+ (FEATURE_OFF(compat, mask) && verify_clean_fs(fs, compat, mask, 0))
old_features[E2P_FEATURE_COMPAT] = sb->s_feature_compat;
old_features[E2P_FEATURE_INCOMPAT] = sb->s_feature_incompat;
@@ -507,6 +615,16 @@ mmp_error:
sb->s_feature_compat &= ~EXT3_FEATURE_COMPAT_HAS_JOURNAL;
}
+ if (FEATURE_OFF_SAFE(E2P_FEATURE_COMPAT,
+ EXT2_FEATURE_COMPAT_EXCLUDE_BITMAP)) {
+ remove_exclude_bitmaps(fs);
+ }
+
+ if (FEATURE_ON_SAFE(E2P_FEATURE_COMPAT,
+ EXT2_FEATURE_COMPAT_EXCLUDE_BITMAP)) {
+ add_exclude_bitmaps(fs);
+ }
+
if (FEATURE_ON(E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_DIR_INDEX)) {
if (!sb->s_def_hash_version)
sb->s_def_hash_version = EXT2_HASH_HALF_MD4;
@@ -551,7 +669,7 @@ mmp_error:
for (i = 0; i < fs->group_desc_count; i++) {
gd = ext2fs_group_desc(fs, fs->group_desc, i);
if ((gd->bg_flags & EXT2_BG_INODE_ZEROED) == 0) {
- /*
+ /*
* XXX what we really should do is zap
* uninitialized inode tables instead.
*/
@@ -1318,6 +1436,10 @@ static int ext2fs_is_meta_block(ext2_filsys fs, blk_t blk)
group = ext2fs_group_of_blk(fs, blk);
if (ext2fs_block_bitmap_loc(fs, group) == blk)
return 1;
+ if (EXT2_HAS_COMPAT_FEATURE(fs->super,
+ EXT2_FEATURE_COMPAT_EXCLUDE_BITMAP) &&
+ ext2fs_exclude_bitmap_loc(fs, group) == blk)
+ return 1;
if (ext2fs_inode_bitmap_loc(fs, group) == blk)
return 1;
return 0;
@@ -1536,6 +1658,17 @@ static int group_desc_scan_and_fix(ext2_filsys fs, ext2fs_block_bitmap bmap)
ext2fs_block_bitmap_loc_set(fs, i, new_blk);
}
+ if (EXT2_HAS_COMPAT_FEATURE(fs->super,
+ EXT2_FEATURE_COMPAT_EXCLUDE_BITMAP)) {
+ blk = ext2fs_exclude_bitmap_loc(fs, i);
+ if (ext2fs_test_block_bitmap(bmap, blk)) {
+ new_blk = translate_block(blk);
+ if (!new_blk)
+ continue;
+ ext2fs_exclude_bitmap_loc_set(fs, i, new_blk);
+ }
+ }
+
blk = ext2fs_inode_bitmap_loc(fs, i);
if (ext2fs_test_block_bitmap2(bmap, blk)) {
new_blk = translate_block(blk);
--
1.7.5.1
--
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