From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Sterba Subject: [PATCH V2] btrfs-progs: Add ioctl to read compressed size of a file Date: Tue, 20 Dec 2011 18:49:58 +0100 Message-ID: <1324403398-12489-1-git-send-email-dsterba@suse.cz> References: <20111219144706.GD24793@shiny> Cc: chris.mason@oracle.com, David Sterba To: linux-btrfs@vger.kernel.org Return-path: In-Reply-To: <20111219144706.GD24793@shiny> List-ID: Signed-off-by: David Sterba --- V1-V2: * match current kernel side and print uncompressed length as well * now it's easy to print the compression ratio for the given range btrfs.c | 9 ++++++- btrfs_cmds.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ btrfs_cmds.h | 1 + ioctl.h | 13 +++++++++++ 4 files changed, 90 insertions(+), 1 deletions(-) diff --git a/btrfs.c b/btrfs.c index 1def354..dbb7224 100644 --- a/btrfs.c +++ b/btrfs.c @@ -128,7 +128,14 @@ static struct Command commands[] = { "filesystem label", " []\n" "With one argument, get the label of filesystem on .\n" "If is passed, set the filesystem label to .\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] |\n" diff --git a/btrfs_cmds.c b/btrfs_cmds.c index b59e9cb..1074ade 100644 --- a/btrfs_cmds.c +++ b/btrfs_cmds.c @@ -1305,3 +1305,71 @@ 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 81182b1..d171214 100644 --- a/btrfs_cmds.h +++ b/btrfs_cmds.h @@ -42,3 +42,4 @@ 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 1ae7537..5b5208a 100644 --- a/ioctl.h +++ b/ioctl.h @@ -224,6 +224,17 @@ 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) @@ -277,5 +288,7 @@ 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 -- 1.7.7.3