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Update for lzo support

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[Btrfs-Progs][V2] Update for lzo support

- Add incompat flag, otherwise btrfs-progs will report error
  when operating on btrfs filesystems mounted with lzo option.

- Update man page.

- Allow to turn on lzo compression for defrag operation:

  # btrfs filesystem defragment -c[zlib, lzo] <file>

  Note: "-c zlib" will fail, because that's how getopt() works
  for optional arguments.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Li Zefan 2010-11-18 03:49:56 +00:00 committed by Chris Mason
parent b8802ae3fa
commit a418b24318
5 changed files with 42 additions and 13 deletions
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2
btrfs.c
View File

@ -65,7 +65,7 @@ static struct Command commands[] = {
"List the recently modified files in a filesystem."
},
{ do_defrag, -1,
"filesystem defragment", "[-vcf] [-s start] [-l len] [-t size] <file>|<dir> [<file>|<dir>...]\n"
"filesystem defragment", "[-vf] [-c[zlib,lzo]] [-s start] [-l len] [-t size] <file>|<dir> [<file>|<dir>...]\n"
"Defragment a file or a directory."
},
{ do_set_default_subvol, 2,

24
btrfs_cmds.c
View File

@ -142,10 +142,21 @@ static u64 parse_size(char *s)
return atoll(s) * mult;
}
static int parse_compress_type(char *s)
{
if (strcmp(optarg, "zlib") == 0)
return BTRFS_COMPRESS_ZLIB;
else if (strcmp(optarg, "lzo") == 0)
return BTRFS_COMPRESS_LZO;
else {
fprintf(stderr, "Unknown compress type %s\n", s);
exit(1);
};
}
int do_defrag(int ac, char **av)
{
int fd;
int compress = 0;
int flush = 0;
u64 start = 0;
u64 len = (u64)-1;
@ -157,15 +168,18 @@ int do_defrag(int ac, char **av)
int fancy_ioctl = 0;
struct btrfs_ioctl_defrag_range_args range;
int e=0;
int compress_type = BTRFS_COMPRESS_NONE;
optind = 1;
while(1) {
int c = getopt(ac, av, "vcfs:l:t:");
int c = getopt(ac, av, "vc::fs:l:t:");
if (c < 0)
break;
switch(c) {
case 'c':
compress = 1;
compress_type = BTRFS_COMPRESS_ZLIB;
if (optarg)
compress_type = parse_compress_type(optarg);
fancy_ioctl = 1;
break;
case 'f':
@ -203,8 +217,10 @@ int do_defrag(int ac, char **av)
range.start = start;
range.len = len;
range.extent_thresh = thresh;
if (compress)
if (compress_type) {
range.flags |= BTRFS_DEFRAG_RANGE_COMPRESS;
range.compress_type = compress_type;
}
if (flush)
range.flags |= BTRFS_DEFRAG_RANGE_START_IO;

10
ctree.h
View File

@ -354,12 +354,14 @@ struct btrfs_super_block {
#define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF (1ULL << 0)
#define BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL (1ULL << 1)
#define BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS (1ULL << 2)
#define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO (1ULL << 3)
#define BTRFS_FEATURE_COMPAT_SUPP 0ULL
#define BTRFS_FEATURE_COMPAT_RO_SUPP 0ULL
#define BTRFS_FEATURE_INCOMPAT_SUPP \
(BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \
BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \
BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \
BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS)
/*
@ -505,9 +507,11 @@ struct btrfs_timespec {
} __attribute__ ((__packed__));
typedef enum {
BTRFS_COMPRESS_NONE = 0,
BTRFS_COMPRESS_ZLIB = 1,
BTRFS_COMPRESS_LAST = 2,
BTRFS_COMPRESS_NONE = 0,
BTRFS_COMPRESS_ZLIB = 1,
BTRFS_COMPRESS_LZO = 2,
BTRFS_COMPRESS_TYPES = 2,
BTRFS_COMPRESS_LAST = 3,
} btrfs_compression_type;
/* we don't understand any encryption methods right now */

9
ioctl.h
View File

@ -116,8 +116,15 @@ struct btrfs_ioctl_defrag_range_args {
*/
__u32 extent_thresh;
/*
* which compression method to use if turning on compression
* for this defrag operation. If unspecified, zlib will
* be used
*/
__u32 compress_type;
/* spare for later */
__u32 unused[5];
__u32 unused[4];
};
struct btrfs_ioctl_space_info {

10
man/btrfs.8.in
View File

@ -15,12 +15,12 @@ btrfs \- control a btrfs filesystem
.PP
\fBbtrfs\fP \fBsubvolume set-default\fP\fI <id> <path>\fP
.PP
\fBbtrfs\fP \fBfilesystem defragment\fP\fI [-vcf] [-s start] [-l len] [-t size] <file>|<dir> [<file>|<dir>...]\fP
.PP
\fBbtrfs\fP \fBfilesystem sync\fP\fI <path> \fP
.PP
\fBbtrfs\fP \fBfilesystem resize\fP\fI [+/\-]<size>[gkm]|max <filesystem>\fP
.PP
\fBbtrfs\fP \fBfilesystem defrag\fP\fI [options] <file>|<dir> [<file>|<dir>...]\fP
.PP
\fBbtrfs\fP \fBdevice scan\fP\fI [<device> [<device>..]]\fP
.PP
\fBbtrfs\fP \fBdevice show\fP\fI <dev>|<label> [<dev>|<label>...]\fP
@ -30,7 +30,6 @@ btrfs \- control a btrfs filesystem
\fBbtrfs\fP \fBdevice add\fP\fI <dev> [<dev>..] <path> \fP
.PP
\fBbtrfs\fP \fBdevice delete\fP\fI <dev> [<dev>..] <path> \fP]
.PP
\fBbtrfs\fP \fBhelp|\-\-help|\-h \fP\fI\fP
.PP
@ -104,10 +103,13 @@ Set the subvolume of the filesystem \fI<path>\fR which is mounted as
is returned by the \fBsubvolume list\fR command.
.TP
\fBfilesystem defragment\fP\fI [-vcf] [-s start] [-l len] [-t size] <file>|<dir> [<file>|<dir>...]\fR
\fBfilesystem defragment\fP -c[zlib|lzo] [-l \fIlen\fR] [-s \fIstart\fR] [-t \fIsize\fR] -[vf] <\fIfile\fR>|<\fIdir\fR> [<\fIfile\fR>|<\fIdir\fR>...]
Defragment file data and/or directory metadata. To defragment all files in a
directory you have to specify each one on its own or use your shell wildcards.
The start position and the number of bytes to deframention can be specified by \fIstart\fR and \fIlen\fR. Any extent bigger than \fIthresh\fR will be considered already defragged. Use 0 to take the kernel default, and use 1 to say eveery single extent must be rewritten. You can also turn on compression in defragment operations.
\fB-v\fP be verbose
\fB-c\fP compress file contents while defragmenting