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Date: Wed, 31 Jan 2007 08:24:46 -0800 (PST)
From: Jim Garlick <garlick@...l.gov>
To: tytso@....edu
cc: linux-ext4@...r.kernel.org
Subject: [patch 2/2] e2fsprogs: user selectable dup block handling in fsck
Second patch that implements new options for shared block handling
in e2fsck pass 1D.
Index: e2fsprogs+chaos/e2fsck/e2fsck.h
===================================================================
--- e2fsprogs+chaos.orig/e2fsck/e2fsck.h
+++ e2fsprogs+chaos/e2fsck/e2fsck.h
@@ -181,6 +181,17 @@ struct resource_track {
#define E2F_PASS_5 5
#define E2F_PASS_1B 6
+typedef enum {
+ E2F_SHARED_PRESERVE = 0,
+ E2F_SHARED_DELETE,
+ E2F_SHARED_LPF
+} shared_opt_t;
+
+typedef enum {
+ E2F_CLONE_DUP = 0,
+ E2F_CLONE_ZERO
+} clone_opt_t;
+
/*
* Define the extended attribute refcount structure
*/
@@ -332,6 +343,8 @@ struct e2fsck_struct {
time_t now;
int ext_attr_ver;
+ shared_opt_t shared;
+ clone_opt_t clone;
profile_t profile;
Index: e2fsprogs+chaos/e2fsck/unix.c
===================================================================
--- e2fsprogs+chaos.orig/e2fsck/unix.c
+++ e2fsprogs+chaos/e2fsck/unix.c
@@ -510,6 +510,49 @@ static void signal_cancel(int sig EXT2FS
}
#endif
+static void initialize_profile_options(e2fsck_t ctx)
+{
+ char *tmp;
+
+ /* [options] shared=preserve|lost+found|delete */
+ tmp = NULL;
+ ctx->shared = E2F_SHARED_PRESERVE;
+ profile_get_string(ctx->profile, "options", "shared", 0,
+ "preserve", &tmp);
+ if (tmp) {
+ if (strcmp(tmp, "preserve") == 0)
+ ctx->shared = E2F_SHARED_PRESERVE;
+ else if (strcmp(tmp, "delete") == 0)
+ ctx->shared = E2F_SHARED_DELETE;
+ else if (strcmp(tmp, "lost+found") == 0)
+ ctx->shared = E2F_SHARED_LPF;
+ else {
+ com_err(ctx->program_name, 0,
+ _("configuration error: 'shared=%s'"), tmp);
+ fatal_error(ctx, 0);
+ }
+ free(tmp);
+ }
+
+ /* [options] clone=dup|zero */
+ tmp = NULL;
+ ctx->clone = E2F_CLONE_DUP;
+ profile_get_string(ctx->profile, "options", "clone", 0,
+ "dup", &tmp);
+ if (tmp) {
+ if (strcmp(tmp, "dup") == 0)
+ ctx->clone = E2F_CLONE_DUP;
+ else if (strcmp(tmp, "zero") == 0)
+ ctx->clone = E2F_CLONE_ZERO;
+ else {
+ com_err(ctx->program_name, 0,
+ _("configuration error: 'clone=%s'"), tmp);
+ fatal_error(ctx, 0);
+ }
+ free(tmp);
+ }
+}
+
static void parse_extended_opts(e2fsck_t ctx, const char *opts)
{
char *buf, *token, *next, *p, *arg;
@@ -543,6 +586,36 @@ static void parse_extended_opts(e2fsck_t
continue;
}
ctx->ext_attr_ver = ea_ver;
+ /* -E shared=preserve|lost+found|delete */
+ } else if (strcmp(token, "shared") == 0) {
+ if (!arg) {
+ extended_usage++;
+ continue;
+ }
+ if (strcmp(arg, "preserve") == 0) {
+ ctx->shared = E2F_SHARED_PRESERVE;
+ } else if (strcmp(arg, "lost+found") == 0) {
+ ctx->shared = E2F_SHARED_LPF;
+ } else if (strcmp(arg, "delete") == 0) {
+ ctx->shared = E2F_SHARED_DELETE;
+ } else {
+ extended_usage++;
+ continue;
+ }
+ /* -E clone=dup|zero */
+ } else if (strcmp(token, "clone") == 0) {
+ if (!arg) {
+ extended_usage++;
+ continue;
+ }
+ if (strcmp(arg, "dup") == 0) {
+ ctx->clone = E2F_CLONE_DUP;
+ } else if (strcmp(arg, "zero") == 0) {
+ ctx->clone = E2F_CLONE_ZERO;
+ } else {
+ extended_usage++;
+ continue;
+ }
} else {
fprintf(stderr, _("Unknown extended option: %s\n"),
token);
@@ -556,6 +629,8 @@ static void parse_extended_opts(e2fsck_t
"and may take an argument which\n"
"is set off by an equals ('=') sign. "
"Valid extended options are:\n"
+ "\tshared=<preserve|lost+found|delete>\n"
+ "\tclone=<dup|zero>\n"
"\tea_ver=<ea_version (1 or 2)>\n\n"), stderr);
exit(1);
}
@@ -615,6 +690,7 @@ static errcode_t PRS(int argc, char *arg
config_fn[0] = cp;
profile_set_syntax_err_cb(syntax_err_report);
profile_init(config_fn, &ctx->profile);
+ initialize_profile_options(ctx);
while ((c = getopt (argc, argv, "panyrcC:B:dE:fvtFVM:b:I:j:P:l:L:N:SsDk")) != EOF)
switch (c) {
Index: e2fsprogs+chaos/e2fsck/pass1b.c
===================================================================
--- e2fsprogs+chaos.orig/e2fsck/pass1b.c
+++ e2fsprogs+chaos/e2fsck/pass1b.c
@@ -448,6 +448,9 @@ static void pass1d(e2fsck_t ctx, char *b
q = (struct dup_block *) dnode_get(m);
if (q->num_bad > 1)
file_ok = 0;
+ if (q->num_bad == 1 && (ctx->clone == E2F_CLONE_ZERO ||
+ ctx->shared != E2F_SHARED_PRESERVE))
+ file_ok = 0;
if (check_if_fs_block(ctx, s->block)) {
file_ok = 0;
meta_data = 1;
@@ -503,13 +506,26 @@ static void pass1d(e2fsck_t ctx, char *b
fix_problem(ctx, PR_1D_DUP_BLOCKS_DEALT, &pctx);
continue;
}
- if (fix_problem(ctx, PR_1D_CLONE_QUESTION, &pctx)) {
+ if (ctx->shared != E2F_SHARED_DELETE &&
+ fix_problem(ctx, PR_1D_CLONE_QUESTION, &pctx)) {
pctx.errcode = clone_file(ctx, ino, p, block_buf);
- if (pctx.errcode)
+ if (pctx.errcode) {
fix_problem(ctx, PR_1D_CLONE_ERROR, &pctx);
- else
- continue;
+ goto delete;
+ }
+ if (ctx->shared == E2F_SHARED_LPF &&
+ fix_problem(ctx, PR_1D_DISCONNECT_QUESTION, &pctx)) {
+ pctx.errcode = ext2fs_unlink(fs, p->dir,
+ NULL, ino, 0);
+ if (pctx.errcode) {
+ fix_problem(ctx, PR_1D_DISCONNECT_ERROR,
+ &pctx);
+ goto delete;
+ }
+ }
+ continue;
}
+delete:
if (fix_problem(ctx, PR_1D_DELETE_QUESTION, &pctx))
delete_file(ctx, ino, p, block_buf);
else
@@ -526,7 +542,8 @@ static void decrement_badcount(e2fsck_t
{
p->num_bad--;
if (p->num_bad <= 0 ||
- (p->num_bad == 1 && !check_if_fs_block(ctx, block)))
+ (p->num_bad == 1 && !check_if_fs_block(ctx, block) &&
+ ctx->clone == E2F_CLONE_DUP && ctx->shared == E2F_SHARED_PRESERVE))
ext2fs_unmark_block_bitmap(ctx->block_dup_map, block);
}
@@ -564,7 +581,7 @@ static int delete_file_block(ext2_filsys
return 0;
}
-
+
static void delete_file(e2fsck_t ctx, ext2_ino_t ino,
struct dup_inode *dp, char* block_buf)
{
@@ -672,11 +689,15 @@ static int clone_file_block(ext2_filsys
printf("Cloning block %u to %u\n", *block_nr,
new_block);
#endif
- retval = io_channel_read_blk(fs->io, *block_nr, 1,
- cs->buf);
- if (retval) {
- cs->errcode = retval;
- return BLOCK_ABORT;
+ if ((ctx->clone == E2F_CLONE_ZERO)) {
+ memset(cs->buf, 0, fs->blocksize);
+ } else {
+ retval = io_channel_read_blk(fs->io, *block_nr,
+ 1, cs->buf);
+ if (retval) {
+ cs->errcode = retval;
+ return BLOCK_ABORT;
+ }
}
retval = io_channel_write_blk(fs->io, new_block, 1,
cs->buf);
Index: e2fsprogs+chaos/e2fsck/problem.h
===================================================================
--- e2fsprogs+chaos.orig/e2fsck/problem.h
+++ e2fsprogs+chaos/e2fsck/problem.h
@@ -536,7 +536,13 @@ struct problem_context {
/* Couldn't clone file (error) */
#define PR_1D_CLONE_ERROR 0x013008
-
+
+/* Unlink file for lost+found reconnect in pass 3? */
+#define PR_1D_DISCONNECT_QUESTION 0x013009
+
+/* Couldn't unlink file (error) */
+#define PR_1D_DISCONNECT_ERROR 0x01300A
+
/*
* Pass 2 errors
*/
Index: e2fsprogs+chaos/e2fsck/problem.c
===================================================================
--- e2fsprogs+chaos.orig/e2fsck/problem.c
+++ e2fsprogs+chaos/e2fsck/problem.c
@@ -40,7 +40,8 @@
#define PROMPT_UNLINK 17
#define PROMPT_CLEAR_HTREE 18
#define PROMPT_RECREATE 19
-#define PROMPT_NULL 20
+#define PROMPT_DISCONNECT 20
+#define PROMPT_NULL 21
/*
* These are the prompts which are used to ask the user if they want
@@ -67,7 +68,8 @@ static const char *prompt[] = {
N_("Unlink"), /* 17 */
N_("Clear HTree index"),/* 18 */
N_("Recreate"), /* 19 */
- "", /* 20 */
+ N_("Unlink file for lost+found reconnect in pass 3"), /* 20 */
+ "", /* 21 */
};
/*
@@ -95,7 +97,8 @@ static const char *preen_msg[] = {
N_("UNLINKED"), /* 17 */
N_("HTREE INDEX CLEARED"),/* 18 */
N_("WILL RECREATE"), /* 19 */
- "", /* 20 */
+ N_("WILL DISCONNECT"), /* 20 */
+ "", /* 21 */
};
static struct e2fsck_problem problem_table[] = {
@@ -912,6 +915,14 @@ static struct e2fsck_problem problem_tab
{ PR_1D_CLONE_ERROR,
N_("Couldn't clone file: %m\n"), PROMPT_NONE, 0 },
+ /* Unlink file for lost+found reconnect in pass 3? */
+ { PR_1D_DISCONNECT_QUESTION,
+ "", PROMPT_DISCONNECT, 0 },
+
+ /* Couldn't unlink file (error) */
+ { PR_1D_DISCONNECT_ERROR,
+ N_("Couldn't unlink file: %m\n"), PROMPT_NONE, 0 },
+
/* Pass 2 errors */
/* Pass 2: Checking directory structure */
Index: e2fsprogs+chaos/e2fsck/e2fsck.8.in
===================================================================
--- e2fsprogs+chaos.orig/e2fsck/e2fsck.8.in
+++ e2fsprogs+chaos/e2fsck/e2fsck.8.in
@@ -165,6 +165,19 @@ following options are supported:
Assume the format of the extended attribute blocks in the filesystem is
the specified version number. The version number may be 1 or 2. The
default extended attribute version format is 2.
+.TP
+.BI clone= dup|zero
+Resolve files with shared blocks in pass 1D by giving each file a private
+copy of the blocks (dup);
+or replacing the shared blocks with private, zero-filled blocks (zero).
+The default is dup.
+.TP
+.BI shared= preserve|lost+found|delete
+Files with shared blocks discovered in pass 1D are cloned and then left
+in place (preserve);
+cloned and then disconnected from their parent directory,
+then reconnected to /lost+found in pass 3 (lost+found);
+or simply deleted (delete). The default is preserve.
.RE
.TP
.B \-f
Index: e2fsprogs+chaos/e2fsck/e2fsck.conf.5.in
===================================================================
--- e2fsprogs+chaos.orig/e2fsck/e2fsck.conf.5.in
+++ e2fsprogs+chaos/e2fsck/e2fsck.conf.5.in
@@ -68,6 +68,7 @@ document.
This stanza contains general configuration parameters for
.BR e2fsck 's
behavior.
+.TP
.I [problems]
This stanza allows the administrator to reconfigure how e2fsck handles
various filesystem inconsistencies.
@@ -87,6 +88,20 @@ This boolean relation controls whether o
filesystem checks (either based on time or number of mounts) should
be doubled if the system is running on battery. It defaults to
true.
+.TP
+.I clone
+This string relation controls the default handling of shared blocks in pass 1D.
+It can be set to dup or zero. See the
+.I "-E clone"
+option description in e2fsck(8).
+.TP
+.I shared
+This string relation controls the default disposition of files discovered to
+have shared blocks in pass 1D. It can be set to preserve, lost+found,
+or delete. See the
+.I "-E shared"
+option description in e2fsck(8).
+
.SH THE [problems] STANZA
Each tag in the
.I [problems]
Index: e2fsprogs+chaos/e2fsck/ChangeLog
===================================================================
--- e2fsprogs+chaos.orig/e2fsck/ChangeLog
+++ e2fsprogs+chaos/e2fsck/ChangeLog
@@ -1,5 +1,12 @@
2007-01-30 Jim Garlick <garlick@...l.gov>
+ * unix.c, pass1b.c, e2fsck.h : Add command line and config file
+ options to alter shared block handling method in pass 1D.
+
+ * problem.c, problem.h (PR_1D_DISCONNECT_*): Add new problem code.
+
+2007-01-30 Jim Garlick <garlick@...l.gov>
+
* unix.c: Parse config file before command line so command line
has precedence. Complain if more than one -E option is
specified
-
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