btrfsprogs/0114-btrfs-progs-Add-ioctl-to-read-compressed-size-of-a-f.patch

From 72218a2090e1cbafe9baa97aaa465a28438c3dbb Mon Sep 17 00:00:00 2001
From: David Sterba <dsterba@suse.cz>
Date: Mon, 19 Dec 2011 17:51:11 +0100
Subject: [PATCH 16/43] btrfs-progs: Add ioctl to read compressed size of a
 file

Signed-off-by: David Sterba <dsterba@suse.cz>
---
 btrfs.c            |    9 ++++++-
 btrfs_cmds.c       |   68 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 btrfs_cmds.h       |    1 +
 ioctl.h            |   13 ++++++++++
 man/btrfs.8.in.old |   10 +++++++
 5 files changed, 100 insertions(+), 1 deletions(-)

diff --git a/btrfs.c b/btrfs.c
index e78f194..f5b8fd4 100644
--- a/btrfs.c
+++ b/btrfs.c
@@ -325,7 +325,14 @@ static struct Command commands[] = {
 	  "filesystem label", "<device> [<newlabel>]\n"
 	  "With one argument, get the label of filesystem on <device>.\n"
 	  "If <newlabel> is passed, set the filesystem label to <newlabel>.\n"
-	  "The filesystem must be unmounted.\n"
+	  "The filesystem must be unmounted."
+	},
+	{ do_compr_size, -1,
+	  "filesystem csize", "[-s start] [-e end] <file>\n"
+		  "Read ordinary and compressed size of extents in the range [start,end)\n"
+		  "-s start  range start inclusive, accepts K/M/G modifiers\n"
+		  "-e end    range end exclusive, accepts K/M/G modifiers\n",
+	  NULL
 	},
 	{ do_scrub_start, -1,
 	  "scrub start", "[-Bdqr] <path>|<device>\n"
diff --git a/btrfs_cmds.c b/btrfs_cmds.c
index 12346e5..c8196d1 100644
--- a/btrfs_cmds.c
+++ b/btrfs_cmds.c
@@ -2058,3 +2058,71 @@ out:
 	free(inodes);
 	return ret;
 }
+
+int do_compr_size(int argc, char **argv)
+{
+	int ret;
+	int fd;
+	struct btrfs_ioctl_compr_size_args args;
+
+	args.start = 0;
+	args.end = (u64)-1;
+	optind = 1;
+	while (1) {
+		int c = getopt(argc, argv, "s:e:r");
+		if (c < 0)
+			break;
+		switch (c) {
+		case 's':
+			args.start = parse_size(optarg);
+			break;
+		case 'e':
+			args.end = parse_size(optarg);
+			break;
+		default:
+			fprintf(stderr, "ERROR: Invalid arguments for csize\n");
+			return 1;
+		}
+	}
+
+	if (args.start > args.end) {
+		fprintf(stderr, "ERROR: Invalid range for csize\n");
+		return 1;
+	}
+
+	if (argc - optind == 0) {
+		fprintf(stderr, "ERROR: Invalid arguments for csize\n");
+		return 1;
+	}
+	argc -= optind;
+
+	fd = open_file_or_dir(argv[optind]);
+	if (fd < 0) {
+		fprintf(stderr, "ERROR: can't access '%s'\n", argv[optind]);
+		return 1;
+	}
+
+	ret = ioctl(fd, BTRFS_IOC_COMPR_SIZE, &args);
+	if (ret < 0) {
+		fprintf(stderr, "ERROR: ioctl returned %d, errno %d %s\n",
+				ret, errno, strerror(errno));
+		return errno;
+	}
+
+	printf("File name: %s\n", argv[optind]);
+	if (args.end == (u64)-1)
+		printf("File range:        %llu-EOF\n",
+				(unsigned long long)args.start);
+	else
+		printf("File range:        %llu-%llu\n",
+				(unsigned long long)args.start,
+				(unsigned long long)args.end);
+
+	printf("Compressed size:   %llu\n",
+			(unsigned long long)(args.compressed_size << 9));
+	printf("Uncompressed size: %llu\n",
+			(unsigned long long)(args.size << 9));
+	printf("Ratio:             %3.2f%%\n",
+			100.0 * args.compressed_size / args.size);
+	return 0;
+}
diff --git a/btrfs_cmds.h b/btrfs_cmds.h
index 53d51d6..07dad7a 100644
--- a/btrfs_cmds.h
+++ b/btrfs_cmds.h
@@ -46,3 +46,4 @@ int open_file_or_dir(const char *fname);
 int do_ino_to_path(int nargs, char **argv);
 int do_logical_to_ino(int nargs, char **argv);
 char *path_for_root(int fd, u64 root);
+int do_compr_size(int argc, char **argv);
diff --git a/ioctl.h b/ioctl.h
index 78aebce..a820098 100644
--- a/ioctl.h
+++ b/ioctl.h
@@ -272,6 +272,17 @@ struct btrfs_ioctl_logical_ino_args {
 	__u64				inodes;
 };
 
+struct btrfs_ioctl_compr_size_args {
+	/* Range start, inclusive */
+	__u64   start;                          /* in */
+	/* Range end, exclusive */
+	__u64   end;                            /* in */
+	__u64   size;                           /* out */
+	__u64   compressed_size;                /* out */
+	__u64   reserved[2];
+};
+
+
 /* BTRFS_IOC_SNAP_CREATE is no longer used by the btrfs command */
 #define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \
 				   struct btrfs_ioctl_vol_args)
@@ -330,5 +341,7 @@ struct btrfs_ioctl_logical_ino_args {
 					struct btrfs_ioctl_ino_path_args)
 #define BTRFS_IOC_LOGICAL_INO _IOWR(BTRFS_IOCTL_MAGIC, 36, \
 					struct btrfs_ioctl_ino_path_args)
+#define BTRFS_IOC_COMPR_SIZE _IOR(BTRFS_IOCTL_MAGIC, 51, \
+		                struct btrfs_ioctl_compr_size_args)
 
 #endif
diff --git a/man/btrfs.8.in.old b/man/btrfs.8.in.old
index be478e0..b7dacea 100644
--- a/man/btrfs.8.in.old
+++ b/man/btrfs.8.in.old
@@ -31,6 +31,8 @@ btrfs \- control a btrfs filesystem
 .PP
 \fBbtrfs\fP \fBfilesystem defragment\fP\fI <file>|<dir> [<file>|<dir>...]\fP
 .PP
+\fBbtrfs\fP \fBfilesystem csize \fP\fI [-s start] [-e end] <file> \fP
+.PP
 \fBbtrfs\fP \fBdevice scan\fP\fI [--all-devices|<device> [<device>...]]\fP
 .PP
 \fBbtrfs\fP \fBdevice show\fP\fI [--all-devices|<uuid>|<label>]\fP
@@ -209,6 +211,14 @@ If \fB--all-devices\fP is passed, all the devices under /dev are scanned;
 otherwise the devices list is extracted from the /proc/partitions file.
 .TP
 
+\fBfilesystem csize \fR \fI [-s start] [-e end] <file> \fR
+Read ordinary and compressed size of extents in the range [start,end) of \fI<file>\fR
+.IP
+\fB-s start\fP  range start inclusive, accepts K/M/G modifiers
+.IP
+\fB-e end\fP    range end exclusive, accepts K/M/G modifiers
+.TP
+
 \fBdevice balance\fR \fI<path>\fR
 Balance the chunks of the filesystem identified by \fI<path>\fR
 across the devices.
-- 
1.7.6.233.gd79bc