This is so we can force chunk allocation to test various parts of the
fs. I used this to test my btrfsck patch for checking for empty block
groups, and a weird block group removal issue.
Signed-off-by: Josef Bacik <jo...@toxicpanda.com>
---
cmds/filesystem.c | 48 +++++++++++++++++++++++++++++++++++++++++++++++
ioctl.h | 1 +
2 files changed, 49 insertions(+)
diff --git a/cmds/filesystem.c b/cmds/filesystem.c
index 4f22089a..93d51195 100644
--- a/cmds/filesystem.c
+++ b/cmds/filesystem.c
@@ -1174,6 +1174,53 @@ static int cmd_filesystem_label(const struct cmd_struct
*cmd,
}
static DEFINE_SIMPLE_COMMAND(filesystem_label, "label");
+static const char * const cmd_filesystem_alloc_chunk_usage[] = {
+ "btrfs filesystem alloc-chunk [data|metadata|system] <path>",
+ "Force a chunk allocation of the specified type on the given
filesystem.",
+ NULL
+};
+
+static int cmd_filesystem_alloc_chunk(const struct cmd_struct *cmd,
+ int argc, char **argv)
+{
+ char *path;
+ DIR *dirstream = NULL;
+ int fd, ret, e;
+ u64 flags = 0;
+
+ clean_args_no_options(cmd, argc, argv);
+
+ if (check_argc_exact(argc - optind, 2))
+ return 1;
+
+ if (!strncmp(argv[optind], "data", strlen("data")))
+ flags = BTRFS_BLOCK_GROUP_DATA;
+ else if (!strncmp(argv[optind], "system", strlen("system")))
+ flags = BTRFS_BLOCK_GROUP_SYSTEM;
+ else if (!strncmp(argv[optind], "metadata", strlen("metadata")))
+ flags = BTRFS_BLOCK_GROUP_METADATA;
+
+ if (flags == 0) {
+ error("Must specify either data, system, or metadata");
+ return 1;
+ }
+
+ path = argv[optind + 1];
+ fd = btrfs_open_dir(path, &dirstream, 1);
+ if (fd < 0)
+ return 1;
+
+ ret = ioctl(fd, BTRFS_IOC_ALLOC_CHUNK, &flags);
+ e = errno;
+ close_file_or_dir(fd, dirstream);
+ if (ret) {
+ error("Failed to alloc chunk: %d", e);
+ return 1;
+ }
+ return 0;
+}
+static DEFINE_SIMPLE_COMMAND(filesystem_alloc_chunk, "alloc-chunk");
+
static const char * const cmd_filesystem_balance_usage[] = {
"btrfs filesystem balance [args...] (alias of \"btrfs balance\")",
"Please see \"btrfs balance --help\" for more information.",
@@ -1209,6 +1256,7 @@ static const struct cmd_group filesystem_cmd_group = {
&cmd_struct_filesystem_resize,
&cmd_struct_filesystem_label,
&cmd_struct_filesystem_usage,
+ &cmd_struct_filesystem_alloc_chunk,
NULL
}
};
diff --git a/ioctl.h b/ioctl.h
index 66ee599f..4a5c2891 100644
--- a/ioctl.h
+++ b/ioctl.h
@@ -929,6 +929,7 @@ static inline char *btrfs_err_str(enum btrfs_err_code
err_code)
struct btrfs_ioctl_get_subvol_rootref_args)
#define BTRFS_IOC_INO_LOOKUP_USER _IOWR(BTRFS_IOCTL_MAGIC, 62, \
struct btrfs_ioctl_ino_lookup_user_args)
+#define BTRFS_IOC_ALLOC_CHUNK _IOR(BTRFS_IOCTL_MAGIC, 63, __u64)
#ifdef __cplusplus
}
#endif
--
2.21.0
