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Btrfs-progs: add btrfs filesystem df to print space info 

This goes along with the new space info ioctl.  This will spit out the space
info all nice and pretty with the type, it's flags (DUP, RAID) and how much
space is in that group and how much is in use.

Signed-off-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Josef Bacik 2010-01-13 18:21:23 +00:00 committed by Chris Mason
parent 35401ac190
commit b72e4c4e19
4 changed files with 107 additions and 0 deletions
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4
btrfs.c
View File

@ -83,6 +83,10 @@ static struct Command commands[] = {
"Show the info of a btrfs filesystem. If no <uuid> or <label>\n"
"is passed, info of all the btrfs filesystem are shown."
},
{ do_df_filesystem, 1,
"filesystem df", "<path>\n"
"Show space usage information for a mount point\n."
},
{ do_balance, 1,
"filesystem balance", "<path>\n"
"Balance the chunks across the device."

88
btrfs_cmds.c
View File

@ -803,3 +803,91 @@ int do_set_default_subvol(int nargs, char **argv)
return 0;
}
int do_df_filesystem(int nargs, char **argv)
{
struct btrfs_ioctl_space_args *sargs;
u64 count = 0, i;
int ret;
int fd;
char *path = argv[1];
fd = open_file_or_dir(path);
if (fd < 0) {
fprintf(stderr, "ERROR: can't access to '%s'\n", path);
return 12;
}
sargs = malloc(sizeof(struct btrfs_ioctl_space_args));
if (!sargs)
return -ENOMEM;
sargs->space_slots = 0;
sargs->total_spaces = 0;
ret = ioctl(fd, BTRFS_IOC_SPACE_INFO, sargs);
if (ret) {
free(sargs);
return ret;
}
if (!sargs->total_spaces)
return 0;
count = sargs->total_spaces;
sargs = realloc(sargs, sizeof(struct btrfs_ioctl_space_args) +
(count * sizeof(struct btrfs_ioctl_space_info)));
if (!sargs)
return -ENOMEM;
sargs->space_slots = count;
sargs->total_spaces = 0;
ret = ioctl(fd, BTRFS_IOC_SPACE_INFO, sargs);
if (ret) {
free(sargs);
return ret;
}
for (i = 0; i < sargs->total_spaces; i++) {
char description[80];
char *total_bytes;
char *used_bytes;
int written = 0;
u64 flags = sargs->spaces[i].flags;
memset(description, 0, 80);
if (flags & BTRFS_BLOCK_GROUP_DATA) {
snprintf(description, 5, "%s", "Data");
written += 4;
} else if (flags & BTRFS_BLOCK_GROUP_SYSTEM) {
snprintf(description, 7, "%s", "System");
written += 6;
} else if (flags & BTRFS_BLOCK_GROUP_METADATA) {
snprintf(description, 9, "%s", "Metadata");
written += 8;
}
if (flags & BTRFS_BLOCK_GROUP_RAID0) {
snprintf(description+written, 8, "%s", ", RAID0");
written += 7;
} else if (flags & BTRFS_BLOCK_GROUP_RAID1) {
snprintf(description+written, 8, "%s", ", RAID1");
written += 7;
} else if (flags & BTRFS_BLOCK_GROUP_DUP) {
snprintf(description+written, 6, "%s", ", DUP");
written += 5;
} else if (flags & BTRFS_BLOCK_GROUP_RAID10) {
snprintf(description+written, 9, "%s", ", RAID10");
written += 8;
}
total_bytes = pretty_sizes(sargs->spaces[i].total_bytes);
used_bytes = pretty_sizes(sargs->spaces[i].used_bytes);
printf("%s: total=%s, used=%s\n", description, total_bytes,
used_bytes);
}
free(sargs);
return 0;
}

1
btrfs_cmds.h
View File

@ -29,3 +29,4 @@ int do_resize(int nargs, char **argv);
int do_subvol_list(int nargs, char **argv);
int do_set_default_subvol(int nargs, char **argv);
int list_subvols(int fd);
int do_df_filesystem(int nargs, char **argv);

14
ioctl.h
View File

@ -120,6 +120,18 @@ struct btrfs_ioctl_defrag_range_args {
__u32 unused[5];
};
struct btrfs_ioctl_space_info {
__u64 flags;
__u64 total_bytes;
__u64 used_bytes;
};
struct btrfs_ioctl_space_args {
__u64 space_slots;
__u64 total_spaces;
struct btrfs_ioctl_space_info spaces[0];
};
#define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \
struct btrfs_ioctl_vol_args)
#define BTRFS_IOC_DEFRAG _IOW(BTRFS_IOCTL_MAGIC, 2, \
@ -155,4 +167,6 @@ struct btrfs_ioctl_defrag_range_args {
#define BTRFS_IOC_INO_LOOKUP _IOWR(BTRFS_IOCTL_MAGIC, 18, \
struct btrfs_ioctl_ino_lookup_args)
#define BTRFS_IOC_DEFAULT_SUBVOL _IOW(BTRFS_IOCTL_MAGIC, 19, u64)
#define BTRFS_IOC_SPACE_INFO _IOWR(BTRFS_IOCTL_MAGIC, 20, \
struct btrfs_ioctl_space_args)
#endif