Date:	Tue, 24 Jul 2007 16:35:04 +0530
From:	Girish Shilamkar <girish@...sterfs.com>
To:	Ext4 Mailing List <linux-ext4@...r.kernel.org>
Cc:	Andreas Dilger <adilger@...sterfs.com>,
	Theodore Tso <tytso@....edu>
Subject: [Patch 9/13] Adds two extended options and config file
	counterparts.

This patch adds two extended options and config file counterparts.
On the command line:

  -E clone=dup|zero

     Select the block cloning method.  "dup" is old behavior which remains
     the default.  "zero" is a new method that substitutes zero-filled
     blocks for the shared blocks in all the files that claim them.

  -E shared=preserve|lost+found|delete

     Select the disposition of files containing shared blocks.  "preserve"
     is the old behavior which remains the default.  "lost+found" causes
     files to be unlinked after cloning so they will be reconnected to
     /lost+found in pass 3.   "delete" skips cloning entirely and simply
     deletes the files.

In the config file:
   [options]
       clone=dup|zero
       shared=preserve|lost+found|delete

Signed-off-by: Jim Garlick  <garlick@...l.gov>

Index: e2fsprogs-1.40.1/e2fsck/e2fsck.h
===================================================================
--- e2fsprogs-1.40.1.orig/e2fsck/e2fsck.h
+++ e2fsprogs-1.40.1/e2fsck/e2fsck.h
@@ -183,6 +183,17 @@ 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-1.40.1/e2fsck/unix.c
===================================================================
--- e2fsprogs-1.40.1.orig/e2fsck/unix.c
+++ e2fsprogs-1.40.1/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);
 	}
@@ -614,6 +689,7 @@ 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-1.40.1/e2fsck/pass1b.c
===================================================================
--- e2fsprogs-1.40.1.orig/e2fsck/pass1b.c
+++ e2fsprogs-1.40.1/e2fsck/pass1b.c
@@ -456,6 +456,9 @@ 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;
@@ -511,13 +514,26 @@ 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
@@ -534,7 +550,8 @@ 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))
 		ext2fs_unmark_block_bitmap(ctx->block_dup_map, block);
 }
 
@@ -572,7 +589,7 @@ 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)
 {
@@ -680,11 +697,15 @@ 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);
@@ -693,6 +714,11 @@ static int clone_file_block(ext2_filsys 
 				return BLOCK_ABORT;
 			}
 			decrement_badcount(ctx, *block_nr, p);
+			if (ctx->clone == E2F_CLONE_ZERO && p->num_bad == 0) {
+				ext2fs_unmark_block_bitmap(ctx->block_found_map,
+							   *block_nr);
+				ext2fs_block_alloc_stats(fs, *block_nr, -1);
+			}
 			*block_nr = new_block;
 			ext2fs_mark_block_bitmap(ctx->block_found_map,
 						 new_block);
Index: e2fsprogs-1.40.1/e2fsck/problem.h
===================================================================
--- e2fsprogs-1.40.1.orig/e2fsck/problem.h
+++ e2fsprogs-1.40.1/e2fsck/problem.h
@@ -542,7 +542,13 @@ struct problem_context {
 
 /* Couldn't clone file (error) */
 #define PR_1D_CLONE_ERROR	0x013008
-		
+
+/* File with shared blocks found */
+#define PR_1D_DISCONNECT_QUESTION 0x013009
+
+/* Couldn't unlink file (error) */
+#define PR_1D_DISCONNECT_ERROR	0x01300A
+
 /*
  * Pass 2 errors
  */
Index: e2fsprogs-1.40.1/e2fsck/problem.c
===================================================================
--- e2fsprogs-1.40.1.orig/e2fsck/problem.c
+++ e2fsprogs-1.40.1/e2fsck/problem.c
@@ -917,6 +917,14 @@ static struct e2fsck_problem problem_tab
 	{ PR_1D_CLONE_ERROR,
 	  N_("Couldn't clone file: %m\n"), PROMPT_NONE, 0 },
 
+	/* File with shared blocks found */
+	{ PR_1D_DISCONNECT_QUESTION,
+	  N_("File with shared blocks found\n"), PROMPT_CONNECT, 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-1.40.1/e2fsck/e2fsck.8.in
===================================================================
--- e2fsprogs-1.40.1.orig/e2fsck/e2fsck.8.in
+++ e2fsprogs-1.40.1/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-1.40.1/e2fsck/e2fsck.conf.5.in
===================================================================
--- e2fsprogs-1.40.1.orig/e2fsck/e2fsck.conf.5.in
+++ e2fsprogs-1.40.1/e2fsck/e2fsck.conf.5.in
@@ -92,6 +92,20 @@ 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] 


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