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From: "Darrick J. Wong" <darrick.wong@oracle.com>
To: david@fromorbit.com, darrick.wong@oracle.com
Cc: linux-xfs@vger.kernel.org, xfs@oss.sgi.com
Subject: [PATCH 50/71] xfs_io: bmap should support querying CoW fork, shared blocks
Date: Thu, 25 Aug 2016 16:51:54 -0700	[thread overview]
Message-ID: <147216911412.4420.8062599654968728476.stgit@birch.djwong.org> (raw)
In-Reply-To: <147216879156.4420.2446767701729565218.stgit@birch.djwong.org>

Teach the bmap command to report shared and delayed allocation
extents, and to be able to query the CoW fork.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
 io/bmap.c           |   43 ++++++++++++++++++++++++++++++++++---------
 man/man8/xfs_bmap.8 |   14 ++++++++++++++
 man/man8/xfs_io.8   |    2 +-
 3 files changed, 49 insertions(+), 10 deletions(-)


diff --git a/io/bmap.c b/io/bmap.c
index b2e48da..2333244 100644
--- a/io/bmap.c
+++ b/io/bmap.c
@@ -41,7 +41,9 @@ bmap_help(void)
 " Holes are marked by replacing the startblock..endblock with 'hole'.\n"
 " All the file offsets and disk blocks are in units of 512-byte blocks.\n"
 " -a -- prints the attribute fork map instead of the data fork.\n"
+" -c -- prints the copy-on-write fork map instead of the data fork.\n"
 " -d -- suppresses a DMAPI read event, offline portions shown as holes.\n"
+" -e -- print delayed allocation extents.\n"
 " -l -- also displays the length of each extent in 512-byte blocks.\n"
 " -n -- query n extents.\n"
 " -p -- obtain all unwritten extents as well (w/ -v show which are unwritten.)\n"
@@ -75,6 +77,7 @@ bmap_f(
 	int			loop = 0;
 	int			flg = 0;
 	int			aflag = 0;
+	int			cflag = 0;
 	int			lflag = 0;
 	int			nflag = 0;
 	int			pflag = 0;
@@ -85,12 +88,19 @@ bmap_f(
 	int			c;
 	int			egcnt;
 
-	while ((c = getopt(argc, argv, "adln:pv")) != EOF) {
+	while ((c = getopt(argc, argv, "acdeln:pv")) != EOF) {
 		switch (c) {
 		case 'a':	/* Attribute fork. */
 			bmv_iflags |= BMV_IF_ATTRFORK;
 			aflag = 1;
 			break;
+		case 'c':	/* CoW fork. */
+			bmv_iflags |= BMV_IF_COWFORK | BMV_IF_DELALLOC;
+			cflag = 1;
+			break;
+		case 'e':
+			bmv_iflags |= BMV_IF_DELALLOC;
+			break;
 		case 'l':	/* list number of blocks with each extent */
 			lflag = 1;
 			break;
@@ -113,7 +123,7 @@ bmap_f(
 			return command_usage(&bmap_cmd);
 		}
 	}
-	if (aflag)
+	if (aflag || cflag)
 		bmv_iflags &= ~(BMV_IF_PREALLOC|BMV_IF_NO_DMAPI_READ);
 
 	if (vflag) {
@@ -273,13 +283,14 @@ bmap_f(
 #define MINRANGE_WIDTH	16
 #define MINAG_WIDTH	2
 #define MINTOT_WIDTH	5
-#define NFLG		5	/* count of flags */
-#define	FLG_NULL	000000	/* Null flag */
-#define	FLG_PRE		010000	/* Unwritten extent */
-#define	FLG_BSU		001000	/* Not on begin of stripe unit  */
-#define	FLG_ESU		000100	/* Not on end   of stripe unit  */
-#define	FLG_BSW		000010	/* Not on begin of stripe width */
-#define	FLG_ESW		000001	/* Not on end   of stripe width */
+#define NFLG		6	/* count of flags */
+#define	FLG_NULL	0000000	/* Null flag */
+#define	FLG_SHARED	0100000	/* shared extent */
+#define	FLG_PRE		0010000	/* Unwritten extent */
+#define	FLG_BSU		0001000	/* Not on begin of stripe unit  */
+#define	FLG_ESU		0000100	/* Not on end   of stripe unit  */
+#define	FLG_BSW		0000010	/* Not on begin of stripe width */
+#define	FLG_ESW		0000001	/* Not on end   of stripe width */
 		int	agno;
 		off64_t agoff, bbperag;
 		int	foff_w, boff_w, aoff_w, tot_w, agno_w;
@@ -350,6 +361,10 @@ bmap_f(
 			if (map[i + 1].bmv_oflags & BMV_OF_PREALLOC) {
 				flg |= FLG_PRE;
 			}
+			if (map[i + 1].bmv_oflags & BMV_OF_SHARED)
+				flg |= FLG_SHARED;
+			if (map[i + 1].bmv_oflags & BMV_OF_DELALLOC)
+				map[i + 1].bmv_block = -2;
 			/*
 			 * If striping enabled, determine if extent starts/ends
 			 * on a stripe unit boundary.
@@ -382,6 +397,14 @@ bmap_f(
 					agno_w, "",
 					aoff_w, "",
 					tot_w, (long long)map[i+1].bmv_length);
+			} else if (map[i + 1].bmv_block == -2) {
+				printf("%4d: %-*s %-*s %*s %-*s %*lld\n",
+					i,
+					foff_w, rbuf,
+					boff_w, _("delalloc"),
+					agno_w, "",
+					aoff_w, "",
+					tot_w, (long long)map[i+1].bmv_length);
 			} else {
 				snprintf(bbuf, sizeof(bbuf), "%lld..%lld",
 					(long long) map[i + 1].bmv_block,
@@ -413,6 +436,8 @@ bmap_f(
 		}
 		if ((flg || pflag) && vflag > 1) {
 			printf(_(" FLAG Values:\n"));
+			printf(_("    %*.*o Shared extent\n"),
+				NFLG+1, NFLG+1, FLG_SHARED);
 			printf(_("    %*.*o Unwritten preallocated extent\n"),
 				NFLG+1, NFLG+1, FLG_PRE);
 			printf(_("    %*.*o Doesn't begin on stripe unit\n"),
diff --git a/man/man8/xfs_bmap.8 b/man/man8/xfs_bmap.8
index e196559..098cfae 100644
--- a/man/man8/xfs_bmap.8
+++ b/man/man8/xfs_bmap.8
@@ -36,6 +36,10 @@ no matter what the filesystem's block size is.
 If this option is specified, information about the file's
 attribute fork is printed instead of the default data fork.
 .TP
+.B \-c
+If this option is specified, information about the file's
+copy on write fork is printed instead of the default data fork.
+.TP
 .B \-d
 If portions of the file have been migrated offline by
 a DMAPI application, a DMAPI read event will be generated to
@@ -45,6 +49,16 @@ printed.  However if the
 option is used, no DMAPI read event will be generated for a
 DMAPI file and offline portions will be reported as holes.
 .TP
+.B \-e
+If this option is used,
+.B xfs_bmap
+obtains all delayed allocation extents, and does not flush dirty pages
+to disk before querying extent data. With the
+.B \-v
+option, the
+.I flags
+column will show which extents have not yet been allocated.
+.TP
 .B \-l
 If this option is used, then
 .IP
diff --git a/man/man8/xfs_io.8 b/man/man8/xfs_io.8
index 2c56f09..d089524 100644
--- a/man/man8/xfs_io.8
+++ b/man/man8/xfs_io.8
@@ -256,7 +256,7 @@ See the
 .B pwrite
 command.
 .TP
-.BI "bmap [ \-adlpv ] [ \-n " nx " ]"
+.BI "bmap [ \-acdelpv ] [ \-n " nx " ]"
 Prints the block mapping for the current open file. Refer to the
 .BR xfs_bmap (8)
 manual page for complete documentation.

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  parent reply	other threads:[~2016-08-25 23:52 UTC|newest]

Thread overview: 72+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-08-25 23:46 [PATCH v8 00/71] xfsprogs: add reflink and dedupe support Darrick J. Wong
2016-08-25 23:46 ` [PATCH 01/71] xfs: remove xfs_btree_bigkey Darrick J. Wong
2016-08-25 23:46 ` [PATCH 02/71] xfs: create a standard btree size calculator code Darrick J. Wong
2016-08-25 23:46 ` [PATCH 03/71] xfs: count the blocks in a btree Darrick J. Wong
2016-08-25 23:46 ` [PATCH 04/71] xfs: defer should allow ->finish_item to request a new transaction Darrick J. Wong
2016-08-25 23:47 ` [PATCH 05/71] xfs: set up per-AG free space reservations Darrick J. Wong
2016-08-25 23:47 ` [PATCH 06/71] xfs: introduce refcount btree definitions Darrick J. Wong
2016-08-25 23:47 ` [PATCH 07/71] xfs: add refcount btree stats infrastructure Darrick J. Wong
2016-08-25 23:47 ` [PATCH 08/71] xfs: refcount btree add more reserved blocks Darrick J. Wong
2016-08-25 23:47 ` [PATCH 09/71] xfs: define the on-disk refcount btree format Darrick J. Wong
2016-08-25 23:47 ` [PATCH 10/71] xfs: account for the refcount btree in the alloc/free log reservation Darrick J. Wong
2016-08-25 23:47 ` [PATCH 11/71] xfs: add refcount btree operations Darrick J. Wong
2016-08-25 23:47 ` [PATCH 12/71] xfs: create refcount update intent log items Darrick J. Wong
2016-08-25 23:47 ` [PATCH 13/71] xfs: log refcount intent items Darrick J. Wong
2016-08-25 23:48 ` [PATCH 14/71] xfs: adjust refcount of an extent of blocks in refcount btree Darrick J. Wong
2016-08-25 23:48 ` [PATCH 15/71] xfs: connect refcount adjust functions to upper layers Darrick J. Wong
2016-08-25 23:48 ` [PATCH 16/71] xfs: adjust refcount when unmapping file blocks Darrick J. Wong
2016-08-25 23:48 ` [PATCH 17/71] xfs: refcount btree requires more reserved space Darrick J. Wong
2016-08-25 23:48 ` [PATCH 18/71] xfs: introduce reflink utility functions Darrick J. Wong
2016-08-25 23:48 ` [PATCH 19/71] xfs: create bmbt update intent log items Darrick J. Wong
2016-08-25 23:48 ` [PATCH 20/71] xfs: log bmap intent items Darrick J. Wong
2016-08-25 23:48 ` [PATCH 21/71] xfs: map an inode's offset to an exact physical block Darrick J. Wong
2016-08-25 23:48 ` [PATCH 22/71] xfs: pass bmapi flags through to bmap_del_extent Darrick J. Wong
2016-08-25 23:48 ` [PATCH 23/71] xfs: implement deferred bmbt map/unmap operations Darrick J. Wong
2016-08-25 23:49 ` [PATCH 24/71] xfs: return work remaining at the end of a bunmapi operation Darrick J. Wong
2016-08-25 23:49 ` [PATCH 25/71] xfs: add reflink feature flag to geometry Darrick J. Wong
2016-08-25 23:49 ` [PATCH 26/71] xfs: don't allow reflinked dir/dev/fifo/socket/pipe files Darrick J. Wong
2016-08-25 23:49 ` [PATCH 27/71] xfs: introduce the CoW fork Darrick J. Wong
2016-08-25 23:49 ` [PATCH 28/71] xfs: support bmapping delalloc extents in " Darrick J. Wong
2016-08-25 23:49 ` [PATCH 29/71] xfs: support allocating delayed extents in " Darrick J. Wong
2016-08-25 23:49 ` [PATCH 30/71] xfs: support removing extents from " Darrick J. Wong
2016-08-25 23:49 ` [PATCH 31/71] xfs: store in-progress CoW allocations in the refcount btree Darrick J. Wong
2016-08-25 23:49 ` [PATCH 32/71] xfs: teach get_bmapx and fiemap about shared extents and the CoW fork Darrick J. Wong
2016-08-25 23:50 ` [PATCH 33/71] xfs: support FS_XFLAG_REFLINK on reflink filesystems Darrick J. Wong
2016-08-25 23:50 ` [PATCH 34/71] xfs: create a separate cow extent size hint for the allocator Darrick J. Wong
2016-08-25 23:50 ` [PATCH 35/71] xfs: preallocate blocks for worst-case btree expansion Darrick J. Wong
2016-08-25 23:50 ` [PATCH 36/71] xfs: try other AGs to allocate a BMBT block Darrick J. Wong
2016-08-25 23:50 ` [PATCH 37/71] xfs: increase log reservations for reflink Darrick J. Wong
2016-08-25 23:50 ` [PATCH 38/71] xfs: add shared rmap map/unmap/convert log item types Darrick J. Wong
2016-08-25 23:50 ` [PATCH 39/71] xfs: use interval query for rmap map and unmap operations on shared files Darrick J. Wong
2016-08-25 23:50 ` [PATCH 40/71] xfs: convert unwritten status of shared-extent reverse mappings " Darrick J. Wong
2016-08-25 23:50 ` [PATCH 41/71] xfs: don't allow realtime and reflinked files to mix Darrick J. Wong
2016-08-25 23:51 ` [PATCH 42/71] xfs: don't mix reflink and DAX mode for now Darrick J. Wong
2016-08-25 23:51 ` [PATCH 43/71] xfs: recognize the reflink feature bit Darrick J. Wong
2016-08-25 23:51 ` [PATCH 44/71] xfs_db: dump refcount btree data Darrick J. Wong
2016-08-25 23:51 ` [PATCH 45/71] xfs_db: add support for checking the refcount btree Darrick J. Wong
2016-08-25 23:51 ` [PATCH 46/71] xfs_db: metadump should copy the refcount btree too Darrick J. Wong
2016-08-25 23:51 ` [PATCH 47/71] xfs_db: deal with the CoW extent size hint Darrick J. Wong
2016-08-25 23:51 ` [PATCH 48/71] xfs_db: print one array element per line Darrick J. Wong
2016-08-25 23:51 ` [PATCH 49/71] xfs_growfs: report the presence of the reflink feature Darrick J. Wong
2016-08-25 23:51 ` Darrick J. Wong [this message]
2016-08-25 23:52 ` [PATCH 51/71] libxfs: add configure option to override system header fsxattr Darrick J. Wong
2016-08-25 23:52 ` [PATCH 52/71] xfs_io: get and set the CoW extent size hint Darrick J. Wong
2016-08-25 23:52 ` [PATCH 53/71] xfs_io: add refcount+bmap error injection types Darrick J. Wong
2016-08-25 23:52 ` [PATCH 54/71] xfs_logprint: support cowextsize reporting in log contents Darrick J. Wong
2016-08-25 23:52 ` [PATCH 55/71] xfs_logprint: support refcount redo items Darrick J. Wong
2016-08-25 23:52 ` [PATCH 56/71] xfs_logprint: support bmap " Darrick J. Wong
2016-08-25 23:52 ` [PATCH 57/71] man: document the reflink inode flag in fsxattr Darrick J. Wong
2016-08-25 23:52 ` [PATCH 58/71] man: document the inode cowextsize flags & fields Darrick J. Wong
2016-08-25 23:52 ` [PATCH 59/71] xfs_repair: fix get_agino_buf to avoid corrupting inodes Darrick J. Wong
2016-08-25 23:53 ` [PATCH 60/71] xfs_repair: check the existing refcount btree Darrick J. Wong
2016-08-25 23:53 ` [PATCH 61/71] xfs_repair: handle multiple owners of data blocks Darrick J. Wong
2016-08-25 23:53 ` [PATCH 62/71] xfs_repair: process reverse-mapping data into refcount data Darrick J. Wong
2016-08-25 23:53 ` [PATCH 63/71] xfs_repair: record reflink inode state Darrick J. Wong
2016-08-25 23:53 ` [PATCH 64/71] xfs_repair: fix inode reflink flags Darrick J. Wong
2016-08-25 23:53 ` [PATCH 65/71] xfs_repair: check the refcount btree against our observed reference counts when -n Darrick J. Wong
2016-08-25 23:53 ` [PATCH 66/71] xfs_repair: rebuild the refcount btree Darrick J. Wong
2016-08-25 23:53 ` [PATCH 67/71] xfs_repair: complain about copy-on-write leftovers Darrick J. Wong
2016-08-25 23:53 ` [PATCH 68/71] xfs_repair: check the CoW extent size hint Darrick J. Wong
2016-08-25 23:54 ` [PATCH 69/71] xfs_repair: use range query when while checking rmaps Darrick J. Wong
2016-08-25 23:54 ` [PATCH 70/71] xfs_repair: check for mergeable refcount records Darrick J. Wong
2016-08-25 23:54 ` [PATCH 71/71] mkfs.xfs: format reflink enabled filesystems Darrick J. Wong

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