Hi, Chris, These patches form the userspace side of the balance management work. This includes two patches to add one-off and polled monitoring, a fork-to-background patch, and a sequence implementing the user interface to handle the various types of balance filtering implemented in the kernel-side patches. Hugo. --- Hugo Mills (8): Balance progress monitoring. Add --monitor option to btrfs balance progress. User-space tool for cancelling balance operations. Run userspace tool in background for balances. Initial implementation of userspace interface for filtered balancing. Balance filter by device ID Balance filter for virtual address range Interface for device range balance filter btrfs.c | 18 ++- btrfs_cmds.c | 463 +++++++++++++++++++++++++++++++++++++++++++++++++++++++- btrfs_cmds.h | 2 + ioctl.h | 46 ++++++ man/btrfs.8.in | 79 +++++++++- 5 files changed, 596 insertions(+), 12 deletions(-) -- 1.7.2.5 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
This patch introduces a basic form of progress monitoring for balance
operations, by counting the number of block groups remaining. The
information is exposed to userspace by an ioctl.
We also add "btrfs balance start" as an alias for "btrfs
filesystem
balance", so that all balance-related functions are available under
one prefix.
Signed-off-by: Hugo Mills <hugo@carfax.org.uk>
---
btrfs.c | 8 +++++++
btrfs_cmds.c | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
btrfs_cmds.h | 1 +
ioctl.h | 7 ++++++
man/btrfs.8.in | 11 ++++++++++
5 files changed, 87 insertions(+), 0 deletions(-)
diff --git a/btrfs.c b/btrfs.c
index 46314cf..0b6186c 100644
--- a/btrfs.c
+++ b/btrfs.c
@@ -95,6 +95,14 @@ static struct Command commands[] = {
"filesystem balance", "<path>\n"
"Balance the chunks across the device."
},
+ { do_balance, 1,
+ "balance start", "<path>\n"
+ "Synonym for \"btrfs filesystem balance\"."
+ },
+ { do_balance_progress, -1,
+ "balance progress", "[-m|--monitor] <path>\n"
+ "Show progress of the balance operation running on <path>."
+ },
{ do_scan,
999, "device scan", "[<device>
[<device>..]\n"
"Scan all device for or the passed device for a btrfs\n"
diff --git a/btrfs_cmds.c b/btrfs_cmds.c
index 8031c58..2745d64 100644
--- a/btrfs_cmds.c
+++ b/btrfs_cmds.c
@@ -28,6 +28,7 @@
#include <limits.h>
#include <uuid/uuid.h>
#include <ctype.h>
+#include <getopt.h>
#undef ULONG_MAX
@@ -776,6 +777,65 @@ int do_balance(int argc, char **argv)
}
return 0;
}
+
+int get_balance_progress(char *path, struct btrfs_ioctl_balance_progress *bal)
+{
+ int fdmnt;
+ int ret = 0;
+ int err = 0;
+
+ fdmnt = open_file_or_dir(path);
+ if(fdmnt < 0) {
+ return -1;
+ }
+
+ ret = ioctl(fdmnt, BTRFS_IOC_BALANCE_PROGRESS, bal);
+ if(ret)
+ err = errno;
+ close(fdmnt);
+
+ return err;
+}
+
+int do_balance_progress(int argc, char **argv)
+{
+ char *path;
+ int ret = 0;
+ int err = 0;
+ struct btrfs_ioctl_balance_progress bal;
+
+ path = argv[1];
+
+ ret = get_balance_progress(path, &bal);
+ if (!ret)
+ printf("\r%llu/%llu block groups moved, "
+ "%0.2f%% complete.\n",
+ bal.completed,
+ bal.expected,
+ (float)bal.completed/bal.expected*100.0);
+
+ switch(ret) {
+ case 0:
+ break;
+ case -1:
+ fprintf(stderr, "ERROR: can''t access
''%s''\n", path);
+ return 13;
+ case EINVAL:
+ if (!monitor) {
+ fprintf(stderr,
+ "No balance operation running on ''%s''.\n",
+ path);
+ return 20;
+ }
+ break;
+ default:
+ fprintf(stderr, "ERROR: ioctl returned error %d.", err);
+ return 21;
+ }
+
+ return 0;
+}
+
int do_remove_volume(int nargs, char **args)
{
diff --git a/btrfs_cmds.h b/btrfs_cmds.h
index 7bde191..47b0a27 100644
--- a/btrfs_cmds.h
+++ b/btrfs_cmds.h
@@ -23,6 +23,7 @@ int do_defrag(int argc, char **argv);
int do_show_filesystem(int nargs, char **argv);
int do_add_volume(int nargs, char **args);
int do_balance(int nargs, char **argv);
+int do_balance_progress(int nargs, char **argv);
int do_remove_volume(int nargs, char **args);
int do_scan(int nargs, char **argv);
int do_resize(int nargs, char **argv);
diff --git a/ioctl.h b/ioctl.h
index 776d7a9..f07d3a2 100644
--- a/ioctl.h
+++ b/ioctl.h
@@ -132,6 +132,11 @@ struct btrfs_ioctl_space_args {
struct btrfs_ioctl_space_info spaces[0];
};
+struct btrfs_ioctl_balance_progress {
+ __u32 expected;
+ __u32 completed;
+};
+
#define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \
struct btrfs_ioctl_vol_args)
#define BTRFS_IOC_DEFRAG _IOW(BTRFS_IOCTL_MAGIC, 2, \
@@ -169,4 +174,6 @@ struct btrfs_ioctl_space_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)
+#define BTRFS_IOC_BALANCE_PROGRESS _IOR(BTRFS_IOCTL_MAGIC, 25, \
+ struct btrfs_ioctl_balance_progress)
#endif
diff --git a/man/btrfs.8.in b/man/btrfs.8.in
index 26ef982..5c953ca 100644
--- a/man/btrfs.8.in
+++ b/man/btrfs.8.in
@@ -23,6 +23,8 @@ btrfs \- control a btrfs filesystem
.PP
\fBbtrfs\fP \fBdevice scan\fP\fI [<device> [<device>..]]\fP
.PP
+\fBbtrfs\fP \fBbalance progress\fP\fI <path>\fP
+.PP
\fBbtrfs\fP \fBdevice show\fP\fI <dev>|<label>
[<dev>|<label>...]\fP
.PP
\fBbtrfs\fP \fBdevice balance\fP\fI <path> \fP
@@ -152,10 +154,19 @@ across the devices.
Add device(s) to the filesystem identified by \fI<path>\fR.
.TP
+.SS
+\fBdevice balance \fI<path>\fP
+Balance the chunks of the filesystem identified by \fI<path>\fP
+across the devices.
+
\fBdevice delete\fR\fI <dev> [<dev>..] <path>\fR
Remove device(s) from a filesystem identified by \fI<path>\fR.
.PP
+\fBbalance progress\fP \fI<path>\fP
+Report progress on the currently-running balance operation on the
+filesystem mounted at \fI<path>\fP.
+
.SH EXIT STATUS
\fBbtrfs\fR returns a zero exist status if it succeeds. Non zero is returned in
case of failure.
--
1.7.2.5
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Hugo Mills
2011-Apr-10 21:16 UTC
[PATCH v5 2/8] Add --monitor option to btrfs balance progress.
For the impatient, this patch introduces the pot-watching --monitor
option, which checks the balance progress at regular intervals, and
updates a single status line with the current progress and an
estimated completion time.
Signed-off-by: Hugo Mills <hugo@carfax.org.uk>
---
btrfs_cmds.c | 102 +++++++++++++++++++++++++++++++++++++++++++++++++++----
ioctl.h | 2 +-
man/btrfs.8.in | 7 ++--
3 files changed, 99 insertions(+), 12 deletions(-)
diff --git a/btrfs_cmds.c b/btrfs_cmds.c
index 2745d64..c681b5a 100644
--- a/btrfs_cmds.c
+++ b/btrfs_cmds.c
@@ -797,22 +797,108 @@ int get_balance_progress(char *path, struct
btrfs_ioctl_balance_progress *bal)
return err;
}
+const struct option progress_options[] = {
+ { "monitor", 0, NULL, ''m'' },
+ { NULL, 0, NULL, 0 }
+};
+
int do_balance_progress(int argc, char **argv)
{
char *path;
int ret = 0;
int err = 0;
struct btrfs_ioctl_balance_progress bal;
+ __u64 last_completed = -1;
+ __u64 initial_completed = -1;
+ struct timeval now;
+ struct timeval started;
+ int monitor = 0;
+
+ optind = 1;
+ while(1) {
+ int c = getopt_long(argc, argv, "m", progress_options, NULL);
+ if (c < 0)
+ break;
+ switch(c) {
+ case ''m'':
+ monitor = 1;
+ break;
+ default:
+ fprintf(stderr, "Invalid arguments for balance progress\n");
+ free(argv);
+ return 1;
+ }
+ }
+
+ if(optind >= argc) {
+ fprintf(stderr, "No filesystem path given for progress\n");
+ return 1;
+ }
- path = argv[1];
+ path = argv[optind];
+ do {
+ int prs = 0;
- ret = get_balance_progress(path, &bal);
- if (!ret)
- printf("\r%llu/%llu block groups moved, "
- "%0.2f%% complete.\n",
- bal.completed,
- bal.expected,
- (float)bal.completed/bal.expected*100.0);
+ ret = get_balance_progress(path, &bal);
+ if (ret)
+ break;
+
+ if (last_completed != bal.completed) {
+ printf("\r%llu/%llu block groups moved, "
+ "%0.2f%% complete.",
+ bal.completed,
+ bal.expected,
+ (float)bal.completed/bal.expected*100.0);
+ }
+
+ if (initial_completed != -1
+ && initial_completed != bal.completed) {
+ ret = gettimeofday(&now, NULL);
+ if (ret) {
+ fprintf(stderr, "Can''t read current time\n");
+ return 22;
+ }
+ /* Seconds per block */
+ float rate = (float)(now.tv_sec - started.tv_sec)
+ / (bal.completed - initial_completed);
+ int secs_remaining = rate
+ * (bal.expected - bal.completed);
+ printf(" Time remaining");
+ if (secs_remaining >= 60*60*24) {
+ printf(" %dd", secs_remaining / (60*60*24));
+ secs_remaining %= 60*60*24;
+ prs = 1;
+ }
+ if (prs || secs_remaining >= 60*60) {
+ printf(" %dh", secs_remaining / (60*60));
+ secs_remaining %= 60*60;
+ prs = 1;
+ }
+ if (prs || secs_remaining > 60) {
+ printf(" %dm", secs_remaining / 60);
+ secs_remaining %= 60;
+ }
+ printf(" %ds\x1b[K", secs_remaining);
+ }
+
+ if (last_completed != -1 && last_completed != bal.completed) {
+ initial_completed = bal.completed;
+ ret = gettimeofday(&started, NULL);
+ if (ret) {
+ fprintf(stderr, "Can''t read current time\n");
+ return 22;
+ }
+ }
+
+ last_completed = bal.completed;
+
+ if (monitor) {
+ fflush(stdout);
+ sleep(1);
+ } else {
+ printf("\n");
+ }
+ } while(monitor);
switch(ret) {
case 0:
diff --git a/ioctl.h b/ioctl.h
index f07d3a2..3eeaa33 100644
--- a/ioctl.h
+++ b/ioctl.h
@@ -174,6 +174,6 @@ struct btrfs_ioctl_balance_progress {
#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)
-#define BTRFS_IOC_BALANCE_PROGRESS _IOR(BTRFS_IOCTL_MAGIC, 25, \
+#define BTRFS_IOC_BALANCE_PROGRESS _IOR(BTRFS_IOCTL_MAGIC, 27, \
struct btrfs_ioctl_balance_progress)
#endif
diff --git a/man/btrfs.8.in b/man/btrfs.8.in
index 5c953ca..90be97e 100644
--- a/man/btrfs.8.in
+++ b/man/btrfs.8.in
@@ -23,7 +23,7 @@ btrfs \- control a btrfs filesystem
.PP
\fBbtrfs\fP \fBdevice scan\fP\fI [<device> [<device>..]]\fP
.PP
-\fBbtrfs\fP \fBbalance progress\fP\fI <path>\fP
+\fBbtrfs\fP \fBbalance progress\fP [\fB-m\fP|\fB--monitor\fP]
\fI<path>\fP
.PP
\fBbtrfs\fP \fBdevice show\fP\fI <dev>|<label>
[<dev>|<label>...]\fP
.PP
@@ -163,9 +163,10 @@ across the devices.
Remove device(s) from a filesystem identified by \fI<path>\fR.
.PP
-\fBbalance progress\fP \fI<path>\fP
+\fBbalance progress\fP [\fB-m\fP|\fB--monitor\fP] \fI<path>\fP
Report progress on the currently-running balance operation on the
-filesystem mounted at \fI<path>\fP.
+filesystem mounted at \fI<path>\fP. Use --monitor to report progress
+continually, including an estimate of completion time.
.SH EXIT STATUS
\fBbtrfs\fR returns a zero exist status if it succeeds. Non zero is returned in
--
1.7.2.5
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Hugo Mills
2011-Apr-10 21:16 UTC
[PATCH v5 3/8] User-space tool for cancelling balance operations.
Add an option to the btrfs tool to use the ioctl for cancelling
balance operations.
Signed-off-by: Hugo Mills <hugo@carfax.org.uk>
---
btrfs.c | 4 ++++
btrfs_cmds.c | 41 +++++++++++++++++++++++++++++++++++++++++
btrfs_cmds.h | 1 +
ioctl.h | 1 +
man/btrfs.8.in | 6 ++++++
5 files changed, 53 insertions(+), 0 deletions(-)
diff --git a/btrfs.c b/btrfs.c
index 0b6186c..93f7886 100644
--- a/btrfs.c
+++ b/btrfs.c
@@ -103,6 +103,10 @@ static struct Command commands[] = {
"balance progress", "[-m|--monitor] <path>\n"
"Show progress of the balance operation running on <path>."
},
+ { do_balance_cancel, 1,
+ "balance cancel", "<path>\n"
+ "Cancel the balance operation running on <path>."
+ },
{ do_scan,
999, "device scan", "[<device>
[<device>..]\n"
"Scan all device for or the passed device for a btrfs\n"
diff --git a/btrfs_cmds.c b/btrfs_cmds.c
index c681b5a..d246a8b 100644
--- a/btrfs_cmds.c
+++ b/btrfs_cmds.c
@@ -922,6 +922,47 @@ int do_balance_progress(int argc, char **argv)
return 0;
}
+int do_balance_cancel(int nargs, char **argv)
+{
+ char *path = argv[1];
+ int fdmnt;
+ int ret = 0;
+ int err = 0;
+
+ fdmnt = open_file_or_dir(path);
+ if(fdmnt < 0) {
+ fprintf(stderr, "ERROR: can''t access
''%s''\n", path);
+ return 12;
+ }
+
+ ret = ioctl(fdmnt, BTRFS_IOC_BALANCE_CANCEL, NULL);
+ err = errno;
+
+ if(ret) {
+ switch(err) {
+ case 0:
+ break;
+ case EINVAL:
+ fprintf(stderr, "ERROR: no balance in progress.\n");
+ err = 20;
+ break;
+ case ECANCELED:
+ fprintf(stderr, "ERROR: operation already cancelled.\n");
+ err = 21;
+ break;
+ default:
+ fprintf(stderr, "ERROR: ioctl returned error
''%d''.\n",
+ err);
+ err = 22;
+ break;
+ }
+ }
+
+ close(fdmnt);
+
+ return err;
+}
+
int do_remove_volume(int nargs, char **args)
{
diff --git a/btrfs_cmds.h b/btrfs_cmds.h
index 47b0a27..5cb0d9c 100644
--- a/btrfs_cmds.h
+++ b/btrfs_cmds.h
@@ -24,6 +24,7 @@ int do_show_filesystem(int nargs, char **argv);
int do_add_volume(int nargs, char **args);
int do_balance(int nargs, char **argv);
int do_balance_progress(int nargs, char **argv);
+int do_balance_cancel(int nargs, char **argv);
int do_remove_volume(int nargs, char **args);
int do_scan(int nargs, char **argv);
int do_resize(int nargs, char **argv);
diff --git a/ioctl.h b/ioctl.h
index 3eeaa33..40c0b57 100644
--- a/ioctl.h
+++ b/ioctl.h
@@ -176,4 +176,5 @@ struct btrfs_ioctl_balance_progress {
struct btrfs_ioctl_space_args)
#define BTRFS_IOC_BALANCE_PROGRESS _IOR(BTRFS_IOCTL_MAGIC, 27, \
struct btrfs_ioctl_balance_progress)
+#define BTRFS_IOC_BALANCE_CANCEL _IO(BTRFS_IOCTL_MAGIC, 28)
#endif
diff --git a/man/btrfs.8.in b/man/btrfs.8.in
index 90be97e..d7fab80 100644
--- a/man/btrfs.8.in
+++ b/man/btrfs.8.in
@@ -25,6 +25,8 @@ btrfs \- control a btrfs filesystem
.PP
\fBbtrfs\fP \fBbalance progress\fP [\fB-m\fP|\fB--monitor\fP]
\fI<path>\fP
.PP
+\fBbtrfs\fP \fBbalance cancel\fP \fI<path>\fP
+.PP
\fBbtrfs\fP \fBdevice show\fP\fI <dev>|<label>
[<dev>|<label>...]\fP
.PP
\fBbtrfs\fP \fBdevice balance\fP\fI <path> \fP
@@ -168,6 +170,10 @@ Report progress on the currently-running balance operation
on the
filesystem mounted at \fI<path>\fP. Use --monitor to report progress
continually, including an estimate of completion time.
+\fbalance cancel\fP \fI<path>\fP
+Cancel the balance currently running on the filesystem mounted at
+\fI<path>\fP.
+
.SH EXIT STATUS
\fBbtrfs\fR returns a zero exist status if it succeeds. Non zero is returned in
case of failure.
--
1.7.2.5
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Hugo Mills
2011-Apr-10 21:16 UTC
[PATCH v5 4/8] Run userspace tool in background for balances.
This patch makes a balance operation fork and detach from the current
terminal, to run the userspace side of the balance in the background.
Introduce a --wait switch so that a synchronous balance can be done if
the user requires.
Signed-off-by: Hugo Mills <hugo@carfax.org.uk>
---
btrfs.c | 8 ++++----
btrfs_cmds.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++--
man/btrfs.8.in | 19 ++++++++++---------
3 files changed, 64 insertions(+), 15 deletions(-)
diff --git a/btrfs.c b/btrfs.c
index 93f7886..7b42658 100644
--- a/btrfs.c
+++ b/btrfs.c
@@ -91,12 +91,12 @@ static struct Command commands[] = {
"filesystem df", "<path>\n"
"Show space usage information for a mount point\n."
},
- { do_balance, 1,
- "filesystem balance", "<path>\n"
+ { do_balance, -1,
+ "filesystem balance", "[-w|--wait] <path>\n"
"Balance the chunks across the device."
},
- { do_balance, 1,
- "balance start", "<path>\n"
+ { do_balance, -1,
+ "balance start", "[-w|--wait] <path>\n"
"Synonym for \"btrfs filesystem balance\"."
},
{ do_balance_progress, -1,
diff --git a/btrfs_cmds.c b/btrfs_cmds.c
index d246a8b..fadcb4f 100644
--- a/btrfs_cmds.c
+++ b/btrfs_cmds.c
@@ -754,12 +754,41 @@ int do_add_volume(int nargs, char **args)
}
+const struct option balance_options[] = {
+ { "wait", 0, NULL, ''w'' },
+ { NULL, 0, NULL, 0 }
+};
+
int do_balance(int argc, char **argv)
{
-
int fdmnt, ret=0;
+ int background = 1;
struct btrfs_ioctl_vol_args args;
- char *path = argv[1];
+ char *path;
+ int ttyfd;
+
+ optind = 1;
+ while(1) {
+ int c = getopt_long(argc, argv, "w", balance_options, NULL);
+ if (c < 0)
+ break;
+ switch(c) {
+ case ''w'':
+ background = 0;
+ break;
+ default:
+ fprintf(stderr, "Invalid arguments for balance\n");
+ free(argv);
+ return 1;
+ }
+ }
+
+ if(optind >= argc) {
+ fprintf(stderr, "No filesystem path given for balance\n");
+ return 1;
+ }
+
+ path = argv[optind];
fdmnt = open_file_or_dir(path);
if (fdmnt < 0) {
@@ -767,6 +796,25 @@ int do_balance(int argc, char **argv)
return 12;
}
+ if (background) {
+ int pid = fork();
+ if (pid == 0) {
+ /* We''re in the child, and can run in the background */
+ ttyfd = open("/dev/tty", O_RDWR);
+ if (ttyfd > 0)
+ ioctl(ttyfd, TIOCNOTTY, 0);
+ /* Fall through to the BTRFS_IOC_BALANCE ioctl */
+ } else if (pid > 0) {
+ /* We''re in the parent, and the fork succeeded */
+ printf("Background balance started\n");
+ return 0;
+ } else {
+ /* We''re in the parent, and the fork failed */
+ fprintf(stderr, "ERROR: can''t start background process --
%s\n",
+ strerror(errno));
+ }
+ }
+
memset(&args, 0, sizeof(args));
ret = ioctl(fdmnt, BTRFS_IOC_BALANCE, &args);
close(fdmnt);
diff --git a/man/btrfs.8.in b/man/btrfs.8.in
index d7fab80..95e39c3 100644
--- a/man/btrfs.8.in
+++ b/man/btrfs.8.in
@@ -23,13 +23,15 @@ btrfs \- control a btrfs filesystem
.PP
\fBbtrfs\fP \fBdevice scan\fP\fI [<device> [<device>..]]\fP
.PP
+\fBbtrfs\fP \fBbalance start\fP [\fB-w\fP|\fB--wait\fP] \fI<path>\fP
+.PP
\fBbtrfs\fP \fBbalance progress\fP [\fB-m\fP|\fB--monitor\fP]
\fI<path>\fP
.PP
\fBbtrfs\fP \fBbalance cancel\fP \fI<path>\fP
.PP
\fBbtrfs\fP \fBdevice show\fP\fI <dev>|<label>
[<dev>|<label>...]\fP
.PP
-\fBbtrfs\fP \fBdevice balance\fP\fI <path> \fP
+\fBbtrfs\fP \fBfilesystem balance\fP [\fB-w\fP|\fB--wait\fP] \fI<path>\fP
.PP
\fBbtrfs\fP \fBdevice add\fP\fI <dev> [<dev>..] <path> \fP
.PP
@@ -147,20 +149,19 @@ Show the btrfs filesystem with some additional info. If no
UUID or label is
passed, \fBbtrfs\fR show info of all the btrfs filesystem.
.TP
-\fBdevice balance\fR \fI<path>\fR
-Balance the chunks of the filesystem identified by \fI<path>\fR
-across the devices.
+\fBdevice balance\fR [\fB-w\fP|\fB--wait\fP] \fI<path>\fR
+
+\fBbalance start\fR [\fB-w\fP|\fB--wait\fP] \fI<path>\fR
+
+Balance the chunks of the filesystem identified by \fI<path>\fR across
+the devices. The process runs in the background. Use \fB--wait\fP to
+wait in the foreground for completion of the balance.
.TP
\fBdevice add\fR\fI <dev> [<dev>..] <path>\fR
Add device(s) to the filesystem identified by \fI<path>\fR.
.TP
-.SS
-\fBdevice balance \fI<path>\fP
-Balance the chunks of the filesystem identified by \fI<path>\fP
-across the devices.
-
\fBdevice delete\fR\fI <dev> [<dev>..] <path>\fR
Remove device(s) from a filesystem identified by \fI<path>\fR.
.PP
--
1.7.2.5
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Hugo Mills
2011-Apr-10 21:16 UTC
[PATCH v5 5/8] Initial implementation of userspace interface for filtered balancing.
It is useful to be able to balance a subset of the full filesystem.
This patch implements the infrastructure for filtering block groups on
different criteria when balancing the filesystem.
Signed-off-by: Hugo Mills <hugo@carfax.org.uk>
---
btrfs.c | 4 +-
btrfs_cmds.c | 169 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-
ioctl.h | 24 ++++++++
man/btrfs.8.in | 40 +++++++++++--
4 files changed, 225 insertions(+), 12 deletions(-)
diff --git a/btrfs.c b/btrfs.c
index 7b42658..19b0e56 100644
--- a/btrfs.c
+++ b/btrfs.c
@@ -92,8 +92,8 @@ static struct Command commands[] = {
"Show space usage information for a mount point\n."
},
{ do_balance, -1,
- "filesystem balance", "[-w|--wait] <path>\n"
- "Balance the chunks across the device."
+ "filesystem balance", "[-w|--wait]
[-f|--filter=<filter>:...] <path>\n"
+ "Balance chunks across the devices. --filter=help for help on
filters.\n"
},
{ do_balance, -1,
"balance start", "[-w|--wait] <path>\n"
diff --git a/btrfs_cmds.c b/btrfs_cmds.c
index fadcb4f..f0588d2 100644
--- a/btrfs_cmds.c
+++ b/btrfs_cmds.c
@@ -756,26 +756,175 @@ int do_add_volume(int nargs, char **args)
const struct option balance_options[] = {
{ "wait", 0, NULL, ''w'' },
+ { "filter", 1, NULL, ''f'' },
+ { "count", 0, NULL, ''c'' },
+ { "verbose", 0, NULL, ''v'' },
{ NULL, 0, NULL, 0 }
};
+struct filter_class_desc {
+ char *keyword;
+ char *description;
+ int flag;
+};
+
+const struct filter_class_desc filter_class[] = {
+ { "type",
+ "type=[~]<flagname>[,...]\n"
+ "\tWhere <flagname> is one of:\n"
+ "\t\tmeta, sys, data, raid0, raid1, raid10, dup\n"
+ "\tPrefix a <flagname> with ~ to negate the match.\n",
+ BTRFS_BALANCE_FILTER_CHUNK_TYPE },
+ { NULL, NULL, 0 }
+};
+
+struct type_filter_desc {
+ char *keyword;
+ __u64 mask;
+ __u64 set;
+ __u64 unset;
+};
+
+#define BTRFS_BLOCK_GROUP_SINGLE \
+ BTRFS_BLOCK_GROUP_RAID0 | \
+ BTRFS_BLOCK_GROUP_RAID1 | \
+ BTRFS_BLOCK_GROUP_RAID10 | \
+ BTRFS_BLOCK_GROUP_DUP
+
+const struct type_filter_desc type_filters[] = {
+ { "data", BTRFS_BLOCK_GROUP_DATA, BTRFS_BLOCK_GROUP_DATA, 0 },
+ { "sys", BTRFS_BLOCK_GROUP_SYSTEM, BTRFS_BLOCK_GROUP_SYSTEM, 0 },
+ { "meta", BTRFS_BLOCK_GROUP_METADATA, BTRFS_BLOCK_GROUP_METADATA, 0
},
+ { "raid0", BTRFS_BLOCK_GROUP_RAID0, BTRFS_BLOCK_GROUP_RAID0, 0 },
+ { "raid1", BTRFS_BLOCK_GROUP_RAID1, BTRFS_BLOCK_GROUP_RAID1, 0 },
+ { "raid10", BTRFS_BLOCK_GROUP_RAID10, BTRFS_BLOCK_GROUP_RAID10, 0 },
+ { "dup", BTRFS_BLOCK_GROUP_DUP, BTRFS_BLOCK_GROUP_DUP, 0 },
+ { "single", BTRFS_BLOCK_GROUP_SINGLE, 0, BTRFS_BLOCK_GROUP_SINGLE },
+ { NULL, 0, 0, 0 }
+};
+
+int parse_filter(struct btrfs_ioctl_balance_start *args, char *filters_string)
+{
+ char *this_filter_string;
+ char *saveptr;
+
+ printf("(entry) %s Args: required %llx, mask %llx\n",
filters_string, args->chunk_type, args->chunk_type_mask);
+
+ /* Parse the filters string, if there is one */
+ this_filter_string = strtok_r(filters_string, ":", &saveptr);
+ while(this_filter_string) {
+ char *subsave;
+ char *part;
+ char *type = strtok_r(this_filter_string, "=,", &subsave);
+ int class_id = -1;
+
+ /* Work out what filter type we''re looking at */
+ if(strcmp(type, "help") == 0) {
+ while(filter_class[++class_id].keyword) {
+ printf("%s", filter_class[class_id].description);
+ }
+ return 1;
+ }
+
+ while(filter_class[++class_id].keyword) {
+ if(strcmp(type, filter_class[class_id].keyword) == 0)
+ break;
+ }
+ if(filter_class[class_id].keyword == NULL) {
+ fprintf(stderr, "ERROR: Unknown filter type
''%s''\n", type);
+ free(args);
+ return 14;
+ }
+
+ /* Mark this filter class as being in use */
+ args->flags |= filter_class[class_id].flag;
+
+ /* Parse the arguments for this filter */
+ part = strtok_r(NULL, "=,", &subsave);
+
+ switch(filter_class[class_id].flag) {
+ case BTRFS_BALANCE_FILTER_CHUNK_TYPE:
+ while(part) {
+ int negated = 0;
+ int i = 0;
+ if(part[0] == ''~'') {
+ negated = 1;
+ part += 1;
+ }
+ while(type_filters[i].keyword) {
+ if(strcmp(part, type_filters[i].keyword) == 0)
+ break;
+ i += 1;
+ }
+ if(type_filters[i].keyword == NULL) {
+ fprintf(stderr, "ERROR: Unknown chunk type
''%s''\n", part);
+ free(args);
+ return 15;
+ }
+
+ args->chunk_type_mask |= type_filters[i].mask;
+ args->chunk_type &= ~type_filters[i].mask;
+ if (negated)
+ args->chunk_type |= type_filters[i].unset;
+ else
+ args->chunk_type |= type_filters[i].set;
+
+ part = strtok_r(NULL, "=,", &subsave);
+ }
+ break;
+ }
+
+ this_filter_string = strtok_r(NULL, ":", &saveptr);
+ }
+
+ printf("(exit) %s Args: required %llx, mask %llx\n", filters_string,
args->chunk_type, args->chunk_type_mask);
+
+ return 0;
+}
+
int do_balance(int argc, char **argv)
{
int fdmnt, ret=0;
int background = 1;
- struct btrfs_ioctl_vol_args args;
+ struct btrfs_ioctl_balance_start *args;
char *path;
int ttyfd;
+ int verbose = 0;
+ int count_only = 0;
+
+ args = malloc(4096);
+ if (!args) {
+ fprintf(stderr, "ERROR: Not enough memory\n");
+ return 13;
+ }
+
+ args->flags = 0;
+ args->chunk_type = 0;
+ args->chunk_type_mask = 0;
optind = 1;
while(1) {
- int c = getopt_long(argc, argv, "w", balance_options, NULL);
+ int c = getopt_long(argc, argv, "wf:", balance_options, NULL);
if (c < 0)
break;
switch(c) {
case ''w'':
background = 0;
break;
+ case ''f'':
+ ret = parse_filter(args, optarg);
+ if (ret != 0) {
+ free(args);
+ return ret;
+ }
+ break;
+ case ''c'':
+ count_only = 1;
+ background = 0;
+ /* Counting is only sensible if we also print some output. */
+ case ''v'':
+ verbose = 1;
+ break;
default:
fprintf(stderr, "Invalid arguments for balance\n");
free(argv);
@@ -783,6 +932,9 @@ int do_balance(int argc, char **argv)
}
}
+ if (background)
+ verbose = 0;
+
if(optind >= argc) {
fprintf(stderr, "No filesystem path given for balance\n");
return 1;
@@ -796,6 +948,9 @@ int do_balance(int argc, char **argv)
return 12;
}
+ if (count_only)
+ args->flags |= BTRFS_BALANCE_FILTER_COUNT_ONLY;
+
if (background) {
int pid = fork();
if (pid == 0) {
@@ -815,14 +970,20 @@ int do_balance(int argc, char **argv)
}
}
- memset(&args, 0, sizeof(args));
- ret = ioctl(fdmnt, BTRFS_IOC_BALANCE, &args);
+ ret = ioctl(fdmnt, BTRFS_IOC_BALANCE_FILTERED, args);
+ free(args);
close(fdmnt);
if(ret<0){
fprintf(stderr, "ERROR: balancing ''%s''\n", path);
return 19;
}
+
+ if (verbose) {
+ printf("%llu chunks considered, %llu chunks balanced\n",
+ args->examined, args->balanced);
+ }
+
return 0;
}
diff --git a/ioctl.h b/ioctl.h
index 40c0b57..6488e82 100644
--- a/ioctl.h
+++ b/ioctl.h
@@ -137,6 +137,28 @@ struct btrfs_ioctl_balance_progress {
__u32 completed;
};
+/* Types of balance filter */
+#define BTRFS_BALANCE_FILTER_COUNT_ONLY 0x1
+
+#define BTRFS_BALANCE_FILTER_CHUNK_TYPE 0x2
+#define BTRFS_BALANCE_FILTER_MASK 0x3
+
+/* All the possible options for a filter */
+struct btrfs_ioctl_balance_start {
+ __u64 flags; /* Bit field indicating which fields of this struct are filled */
+
+ /* Output values: chunk counts */
+ __u64 examined;
+ __u64 balanced;
+
+ /* For FILTER_CHUNK_TYPE */
+ __u64 chunk_type; /* Flag bits required */
+ __u64 chunk_type_mask; /* Mask of bits to examine */
+
+ __u64 spare[506]; /* Make up the size of the structure to 4088
+ * bytes for future expansion */
+};
+
#define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \
struct btrfs_ioctl_vol_args)
#define BTRFS_IOC_DEFRAG _IOW(BTRFS_IOCTL_MAGIC, 2, \
@@ -177,4 +199,6 @@ struct btrfs_ioctl_balance_progress {
#define BTRFS_IOC_BALANCE_PROGRESS _IOR(BTRFS_IOCTL_MAGIC, 27, \
struct btrfs_ioctl_balance_progress)
#define BTRFS_IOC_BALANCE_CANCEL _IO(BTRFS_IOCTL_MAGIC, 28)
+#define BTRFS_IOC_BALANCE_FILTERED _IOWR(BTRFS_IOCTL_MAGIC, 29, \
+ struct btrfs_ioctl_balance_start)
#endif
diff --git a/man/btrfs.8.in b/man/btrfs.8.in
index 95e39c3..3023eb5 100644
--- a/man/btrfs.8.in
+++ b/man/btrfs.8.in
@@ -31,7 +31,7 @@ btrfs \- control a btrfs filesystem
.PP
\fBbtrfs\fP \fBdevice show\fP\fI <dev>|<label>
[<dev>|<label>...]\fP
.PP
-\fBbtrfs\fP \fBfilesystem balance\fP [\fB-w\fP|\fB--wait\fP] \fI<path>\fP
+\fBbtrfs\fP \fBfilesystem balance\fP [\fB-wcv\fP] [\fB--wait\fP]
[\fB--count\fP] [\fB--verbose\fP] [\fB-f\fP|\fBfilter=\fP\fI<filter>\fP]
\fI<path>\fP
.PP
\fBbtrfs\fP \fBdevice add\fP\fI <dev> [<dev>..] <path> \fP
.PP
@@ -149,13 +149,18 @@ Show the btrfs filesystem with some additional info. If no
UUID or label is
passed, \fBbtrfs\fR show info of all the btrfs filesystem.
.TP
-\fBdevice balance\fR [\fB-w\fP|\fB--wait\fP] \fI<path>\fR
+\fBdevice balance\fP [\fB-wcv\fP] [\fB--wait\fP] [\fB--count\fP]
[\fB--verbose\fP] [\fB-f\fP|\fBfilter=\fP\fI<filter>\fP]
\fI<path>\fP
-\fBbalance start\fR [\fB-w\fP|\fB--wait\fP] \fI<path>\fR
+\fBbalance start\fR [\fB-wcv\fP] [\fB--wait\fP] [\fB--count\fP]
[\fB--verbose\fP] [\fB-f\fP|\fBfilter=\fP\fI<filter>\fP]
\fI<path>\fP
Balance the chunks of the filesystem identified by \fI<path>\fR across
-the devices. The process runs in the background. Use \fB--wait\fP to
-wait in the foreground for completion of the balance.
+the devices. The command returns immediately, and the balance
+operation runs in the background. Use \fB--wait\fP to run
+synchronously instead. Use \fB--count\fP to scan the filesystem and
+report the number of chunks that would be processed. Use
+\fB--verbose\fP in synchronous mode to report the number of chunks
+examined and balanced. See \fBBALANCE FILTERS\fR, below, for details
+of the different filter types and syntax.
.TP
\fBdevice add\fR\fI <dev> [<dev>..] <path>\fR
@@ -171,10 +176,33 @@ Report progress on the currently-running balance operation
on the
filesystem mounted at \fI<path>\fP. Use --monitor to report progress
continually, including an estimate of completion time.
-\fbalance cancel\fP \fI<path>\fP
+\fBbalance cancel\fP \fI<path>\fP
Cancel the balance currently running on the filesystem mounted at
\fI<path>\fP.
+.SH BALANCE FILTERS
+With balance filters, it is possible to perform a balance operation on
+only a subset of the available chunks. Filters are specified with the
+\fB--filter\fR option of \fBbtrfs device balance\fR or \fBbtrfs
+balance start\fR. Multiple filters may be given, either with multiple
+\fB--filter\fR options, or in a colon-separated list. When multiple
+filters are given, only the chunks meeting all of the selection
+critera are balanced. Help on the avaialble filters can be obtained
+with \fB--filter=help\fR.
+
+.TP
+\fBtype\fR=[\fB~\fR]\fI<flagname>\fR[\fB,\fR...]
+
+Select only the chunks with the given type flag(s). Requiring a flag
+to be off can be specified with a \fB~\fR preceding the flag
+name. Flag names are:
+
+\fBmeta\fR, \fBdata\fR, \fBsys\fR for metadata, file data and system
+chunk types.
+
+\fBraid0\fR, \fBraid1\fR, \fBraid10\fR, \fBdup\fR for chunks of the
+given replication levels.
+
.SH EXIT STATUS
\fBbtrfs\fR returns a zero exist status if it succeeds. Non zero is returned in
case of failure.
--
1.7.2.5
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Add the userspace implementation for filtering balances by device ID.
Signed-off-by: Hugo Mills <hugo@carfax.org.uk>
---
btrfs_cmds.c | 13 +++++++++++++
ioctl.h | 8 ++++++--
man/btrfs.8.in | 7 +++++++
3 files changed, 26 insertions(+), 2 deletions(-)
diff --git a/btrfs_cmds.c b/btrfs_cmds.c
index f0588d2..ffca32b 100644
--- a/btrfs_cmds.c
+++ b/btrfs_cmds.c
@@ -775,6 +775,10 @@ const struct filter_class_desc filter_class[] = {
"\t\tmeta, sys, data, raid0, raid1, raid10, dup\n"
"\tPrefix a <flagname> with ~ to negate the match.\n",
BTRFS_BALANCE_FILTER_CHUNK_TYPE },
+ { "devid",
+ "devid=<n>\n"
+ "\tBalance only chunks which have a stripe on device
<n>.\n",
+ BTRFS_BALANCE_FILTER_DEVID },
{ NULL, NULL, 0 }
};
@@ -872,6 +876,15 @@ int parse_filter(struct btrfs_ioctl_balance_start *args,
char *filters_string)
part = strtok_r(NULL, "=,", &subsave);
}
break;
+
+ case BTRFS_BALANCE_FILTER_DEVID:
+ errno = 0;
+ args->devid = strtoull(part, NULL, 10);
+ if (errno != 0) {
+ fprintf(stderr, "ERROR: ''%s'' is not a valid device
ID\n", part);
+ return 15;
+ }
+ break;
}
this_filter_string = strtok_r(NULL, ":", &saveptr);
diff --git a/ioctl.h b/ioctl.h
index 6488e82..cb605c0 100644
--- a/ioctl.h
+++ b/ioctl.h
@@ -141,7 +141,8 @@ struct btrfs_ioctl_balance_progress {
#define BTRFS_BALANCE_FILTER_COUNT_ONLY 0x1
#define BTRFS_BALANCE_FILTER_CHUNK_TYPE 0x2
-#define BTRFS_BALANCE_FILTER_MASK 0x3
+#define BTRFS_BALANCE_FILTER_DEVID 0x4
+#define BTRFS_BALANCE_FILTER_MASK 0x7
/* All the possible options for a filter */
struct btrfs_ioctl_balance_start {
@@ -155,7 +156,10 @@ struct btrfs_ioctl_balance_start {
__u64 chunk_type; /* Flag bits required */
__u64 chunk_type_mask; /* Mask of bits to examine */
- __u64 spare[506]; /* Make up the size of the structure to 4088
+ /* For FILTER_DEVID */
+ __u64 devid;
+
+ __u64 spare[505]; /* Make up the size of the structure to 4088
* bytes for future expansion */
};
diff --git a/man/btrfs.8.in b/man/btrfs.8.in
index 3023eb5..94114a9 100644
--- a/man/btrfs.8.in
+++ b/man/btrfs.8.in
@@ -203,6 +203,13 @@ chunk types.
\fBraid0\fR, \fBraid1\fR, \fBraid10\fR, \fBdup\fR for chunks of the
given replication levels.
+.TP
+\fBdevid\fR=\fI<n>\fR
+
+Select chunks which have data on device ID \fI<n>\fR. This can be
+used, for example, to reduplicate data in a mirrored configuration
+where one drive has been lost due to hardware failure.
+
.SH EXIT STATUS
\fBbtrfs\fR returns a zero exist status if it succeeds. Non zero is returned in
case of failure.
--
1.7.2.5
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Implement the userspace side of the virtual address range filter.
Signed-off-by: Hugo Mills <hugo@carfax.org.uk>
---
btrfs_cmds.c | 22 ++++++++++++++++++++++
ioctl.h | 9 +++++++--
man/btrfs.8.in | 9 +++++++++
3 files changed, 38 insertions(+), 2 deletions(-)
diff --git a/btrfs_cmds.c b/btrfs_cmds.c
index ffca32b..e5f2c39 100644
--- a/btrfs_cmds.c
+++ b/btrfs_cmds.c
@@ -779,6 +779,12 @@ const struct filter_class_desc filter_class[] = {
"devid=<n>\n"
"\tBalance only chunks which have a stripe on device
<n>.\n",
BTRFS_BALANCE_FILTER_DEVID },
+ { "vrange",
+ "vrange=<start>,<end>\n"
+ "\tBalances only chunks which have any bytes within the given\n"
+ "\trange of the filesystem''s virtual address space.\n"
+ "\t<start> is inclusive, <end> is exclusive.\n",
+ BTRFS_BALANCE_FILTER_VIRTUAL_ADDRESS_RANGE },
{ NULL, NULL, 0 }
};
@@ -885,6 +891,22 @@ int parse_filter(struct btrfs_ioctl_balance_start *args,
char *filters_string)
return 15;
}
break;
+
+ case BTRFS_BALANCE_FILTER_VIRTUAL_ADDRESS_RANGE:
+ errno = 0;
+ args->vrange_start = strtoull(part, NULL, 10);
+ if (errno != 0) {
+ fprintf(stderr, "ERROR: ''%s'' is not a valid start
address\n", part);
+ return 15;
+ }
+ part = strtok_r(NULL, "=,", &subsave);
+ errno = 0;
+ args->vrange_end = strtoull(part, NULL, 10);
+ if (errno != 0) {
+ fprintf(stderr, "ERROR: ''%s'' is not a valid end
address\n", part);
+ return 15;
+ }
+ break;
}
this_filter_string = strtok_r(NULL, ":", &saveptr);
diff --git a/ioctl.h b/ioctl.h
index cb605c0..71fa90e 100644
--- a/ioctl.h
+++ b/ioctl.h
@@ -142,7 +142,8 @@ struct btrfs_ioctl_balance_progress {
#define BTRFS_BALANCE_FILTER_CHUNK_TYPE 0x2
#define BTRFS_BALANCE_FILTER_DEVID 0x4
-#define BTRFS_BALANCE_FILTER_MASK 0x7
+#define BTRFS_BALANCE_FILTER_VIRTUAL_ADDRESS_RANGE 0x8
+#define BTRFS_BALANCE_FILTER_MASK 0xf
/* All the possible options for a filter */
struct btrfs_ioctl_balance_start {
@@ -159,7 +160,11 @@ struct btrfs_ioctl_balance_start {
/* For FILTER_DEVID */
__u64 devid;
- __u64 spare[505]; /* Make up the size of the structure to 4088
+ /* For FILTER_VIRTUAL_ADDRESS_RANGE */
+ __u64 vrange_start;
+ __u64 vrange_end;
+
+ __u64 spare[503]; /* Make up the size of the structure to 4088
* bytes for future expansion */
};
diff --git a/man/btrfs.8.in b/man/btrfs.8.in
index 94114a9..1031af6 100644
--- a/man/btrfs.8.in
+++ b/man/btrfs.8.in
@@ -210,6 +210,15 @@ Select chunks which have data on device ID \fI<n>\fR.
This can be
used, for example, to reduplicate data in a mirrored configuration
where one drive has been lost due to hardware failure.
+.TP
+\fBvrange\fR=\fI<start>\fB,\fI<end>\fR
+
+Select chunks which have btrfs-internal virtual addresses within the
+range \fI<start>\fR (inclusive) to \fI<end>\fR (exclusive). Given
the
+address of the last chunk moved, this filter can be used to restart a
+cancelled or interrupted balance operation, by supplying a range of
+\fB0,\fI<chunkaddr+1>\fR.
+
.SH EXIT STATUS
\fBbtrfs\fR returns a zero exist status if it succeeds. Non zero is returned in
case of failure.
--
1.7.2.5
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Implement the userspace side of the balance filter for a range of
bytes on any device. Note that this will match the same range on any
device, so the use of the devid filter is recommended where this
filter is used.
Signed-off-by: Hugo Mills <hugo@carfax.org.uk>
---
btrfs_cmds.c | 22 ++++++++++++++++++++++
ioctl.h | 9 +++++++--
man/btrfs.8.in | 8 ++++++++
3 files changed, 37 insertions(+), 2 deletions(-)
diff --git a/btrfs_cmds.c b/btrfs_cmds.c
index e5f2c39..e82c103 100644
--- a/btrfs_cmds.c
+++ b/btrfs_cmds.c
@@ -785,6 +785,12 @@ const struct filter_class_desc filter_class[] = {
"\trange of the filesystem''s virtual address space.\n"
"\t<start> is inclusive, <end> is exclusive.\n",
BTRFS_BALANCE_FILTER_VIRTUAL_ADDRESS_RANGE },
+ { "drange",
+ "drange=<start>,<end>\n"
+ "\tBalances chunks which have any bytes within the given\n"
+ "\tbyte range on any of the filesystem''s underlying
devices.\n"
+ "\t<start> is inclusive, <end> is exclusive.\n",
+ BTRFS_BALANCE_FILTER_DEVICE_ADDRESS_RANGE },
{ NULL, NULL, 0 }
};
@@ -907,6 +913,22 @@ int parse_filter(struct btrfs_ioctl_balance_start *args,
char *filters_string)
return 15;
}
break;
+
+ case BTRFS_BALANCE_FILTER_DEVICE_ADDRESS_RANGE:
+ errno = 0;
+ args->drange_start = strtoull(part, NULL, 10);
+ if (errno != 0) {
+ fprintf(stderr, "ERROR: ''%s'' is not a valid start
address\n", part);
+ return 15;
+ }
+ part = strtok_r(NULL, "=,", &subsave);
+ errno = 0;
+ args->drange_end = strtoull(part, NULL, 10);
+ if (errno != 0) {
+ fprintf(stderr, "ERROR: ''%s'' is not a valid end
address\n", part);
+ return 15;
+ }
+ break;
}
this_filter_string = strtok_r(NULL, ":", &saveptr);
diff --git a/ioctl.h b/ioctl.h
index 71fa90e..a99c225 100644
--- a/ioctl.h
+++ b/ioctl.h
@@ -143,7 +143,8 @@ struct btrfs_ioctl_balance_progress {
#define BTRFS_BALANCE_FILTER_CHUNK_TYPE 0x2
#define BTRFS_BALANCE_FILTER_DEVID 0x4
#define BTRFS_BALANCE_FILTER_VIRTUAL_ADDRESS_RANGE 0x8
-#define BTRFS_BALANCE_FILTER_MASK 0xf
+#define BTRFS_BALANCE_FILTER_DEVICE_ADDRESS_RANGE 0x10
+#define BTRFS_BALANCE_FILTER_MASK 0x1f
/* All the possible options for a filter */
struct btrfs_ioctl_balance_start {
@@ -164,7 +165,11 @@ struct btrfs_ioctl_balance_start {
__u64 vrange_start;
__u64 vrange_end;
- __u64 spare[503]; /* Make up the size of the structure to 4088
+ /* For FILTER_DEVICE_ADDRESS_RANGE */
+ __u64 drange_start;
+ __u64 drange_end;
+
+ __u64 spare[501]; /* Make up the size of the structure to 4088
* bytes for future expansion */
};
diff --git a/man/btrfs.8.in b/man/btrfs.8.in
index 1031af6..6adf8bb 100644
--- a/man/btrfs.8.in
+++ b/man/btrfs.8.in
@@ -219,6 +219,14 @@ address of the last chunk moved, this filter can be used to
restart a
cancelled or interrupted balance operation, by supplying a range of
\fB0,\fI<chunkaddr+1>\fR.
+.TP
+\fBdrange\fR=\fI<start>\fB,\fI<end>\fR
+
+Select chunks which contain data in the address range \fI<start>\fR
+(inclusive) to \fI<end>\fR (exclusive) on \fIany\fR block device in
+the filesystem. Can be mixed with the \fBdevid\fR filter to select
+chunks in a given address range on a specific device.
+
.SH EXIT STATUS
\fBbtrfs\fR returns a zero exist status if it succeeds. Non zero is returned in
case of failure.
--
1.7.2.5
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Helmut Hullen
2011-Apr-11 05:36 UTC
Re: [PATCH v5 4/8] Run userspace tool in background for balances.
Hallo, Hugo, Du meintest am 10.04.11:> This patch makes a balance operation fork and detach from the current > terminal, to run the userspace side of the balance in the background.Fine! Viele Gruesse! Helmut -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html