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git://sourceware.org/git/lvm2.git
synced 2024-12-21 13:34:40 +03:00
o Include dmsetup man page in build
o Allow pathname in dmsetup device arg o Generated patches for 0.90.02
This commit is contained in:
Alasdair Kergon
parent
515df8784a
commit
df520f1265
@ -49,6 +49,15 @@ void dm_log_init(dm_log_fn fn)
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_log = fn;
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}
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void _build_dev_path(char *buffer, size_t len, const char *dev_name)
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{
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/* If there's a /, assume caller knows what they're doing */
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if (strchr(dev_name, '/'))
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snprintf(buffer, len, "%s", dev_name);
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else
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snprintf(buffer, len, "/dev/%s/%s", DM_DIR, dev_name);
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}
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struct dm_task *dm_task_create(int type)
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{
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struct dm_task *dmt = malloc(sizeof(*dmt));
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@ -66,10 +75,34 @@ struct dm_task *dm_task_create(int type)
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int dm_task_set_name(struct dm_task *dmt, const char *name)
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{
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char *pos;
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char path[PATH_MAX];
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struct stat st1, st2;
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if (dmt->dev_name)
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free(dmt->dev_name);
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return (dmt->dev_name = strdup(name)) ? 1 : 0;
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/* If path was supplied, remove it if it points to the same device
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* as its last component.
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*/
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if ((pos = strrchr(name, '/'))) {
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snprintf(path, sizeof(path), "/dev/%s/%s", DM_DIR, pos + 1);
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if (stat(name, &st1) || stat(path, &st2) ||
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!(st1.st_dev == st2.st_dev)) {
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log("dm_task_set_name: Device %s not found", name);
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return 0;
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}
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name = pos + 1;
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}
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if (!(dmt->dev_name = strdup(name))) {
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log("dm_task_set_name: strdup(%s) failed", name);
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return 0;
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}
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return 1;
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}
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int dm_task_add_target(struct dm_task *dmt,
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@ -93,11 +126,6 @@ int dm_task_add_target(struct dm_task *dmt,
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return 1;
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}
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void _build_dev_path(char *buffer, size_t len, const char *dev_name)
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{
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snprintf(buffer, len, "/dev/%s/%s", DM_DIR, dev_name);
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}
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int add_dev_node(const char *dev_name, dev_t dev)
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{
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char path[PATH_MAX];
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@ -4,91 +4,90 @@ dmsetup \- low level logical volume management
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.SH SYNOPSIS
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.ad l
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.B dmsetup create
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.I <device name> <table path>
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.I device_name table_file
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.br
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.B dmsetup remove
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.I <device name>
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.I device_name
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.br
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.B dmsetup suspend
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.I <device name>
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.I device_name
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.br
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.B dmsetup resume
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.I <device name>
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.I device_name
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.br
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.B dmsetup reload
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.I <device name> <table path>
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.I device_name table_file
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.br
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.B dmsetup info
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.I <device name>
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.I device_name
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.ad b
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.SH DESCRIPTION
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dmsetup is used to manage mapped devices using the device-mapper
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driver. Devices are created by loading a table that gives a target
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for ranges of sectors in the logical device.
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dmsetup manages logical devices that use the device-mapper driver.
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Devices are created by loading a table that specifies a target for
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each sector in the logical device.
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The first argument to dmsetup is a command, after this the mapped
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device name (not the full path).
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.SH Commands
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.RS
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The first argument to dmsetup is a command.
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The second argument is the logical device name.
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.SH COMMANDS
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.IP \fBcreate
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.I <device name> <table path>
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.I device_name table_file
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.br
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Attempts to create a device using the table file given. If
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successful a device will appear as
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/dev/device-mapper/<device-name>. See below for information
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on the table file format.
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.IP \fBremove
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.I <device name>
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.I device_name
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.br
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Removes the device
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.IP \fBsuspend
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.I <device name>
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.I device_name
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.br
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Suspends a device, there are two parts to this. Firstly any
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io that has already been mapped by the device, but has not yet
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completed will be flushed. Secondly any further io to that
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Suspends a device. Any I/O that has already been mapped by the device
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but has not yet completed will be flushed. Any further I/O to that
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device will be postponed for as long as the device is suspended.
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.IP \fBresume
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.I <device name>
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.I device_name
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.br
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Un-suspends a device, postponed io now get's re-queued for processing.
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Un-suspends a device. Postponed I/O now gets re-queued for processing.
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.IP \fBreload
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.I <device name> <table path>
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.I device_name table_file
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.br
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This command will only work if a device is in the suspended state.
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It allows the user to change the mapping table for an existing device.
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It changes the mapping table for an existing device.
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.IP \fBinfo
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.I <device name>
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.I device_name
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.br
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Output's some brief information about the device in the form:
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Outputs some brief information about the device in the form:
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.br
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<SUSPENDED|ACTIVE>
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SUSPENDED|ACTIVE
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.br
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<open count>
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open_count
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.br
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<major>,<minor>
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major,minor
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.br
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<target count>
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.SH Table format
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Each line of the table specifies a single target, and is of the form:
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target_count
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.SH TABLE FORMAT
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Each line of the table specifies a single target and is of the form:
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.br
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<logical start sector> <num sectors> <target type> <target args...>
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logical_start_sector num_sectors target_type target_args
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.br
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At the moment there are 3 simple target types available (though your
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system may have more in the form of modules).
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.br
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At the moment there are 3 simple target types available - though your
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system might have more in the form of modules.
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.IP \fBlinear
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.I <destination device> <start sector>
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.I destination_device start_sector
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.br
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The traditional linear mapping.
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.IP \fBstriped
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.I <num stripes> <chunk size> [<destination #n> <start sector >]+
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.I num_stripes chunk_size [destination start_sector]+
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.br
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Creates a striped area,
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Creates a striped area.
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.br
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eg, striped 2 32 /dev/hda1 0 /dev/hdb1 0
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will map the first chunk (16k) as follows:
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e.g. striped 2 32 /dev/hda1 0 /dev/hdb1 0
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will map the first chunk (16k) as follows:
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.br
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LV chunk 1 -> hda1, chunk 1
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.br
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@ -103,15 +102,16 @@ eg, striped 2 32 /dev/hda1 0 /dev/hdb1 0
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.IP \fBio-err
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.br
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Errors any io that goes to this area. Useful for testing or
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creating devices with holes in them.
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Errors any I/O that goes to this area. Useful for testing or
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for creating devices with holes in them.
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.SH Examples
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.SH EXAMPLES
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# A table to join two disks together
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.br
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.br
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0 1028160 linear /dev/hda 0
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.br
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1028160 3903762 linear /dev/hdb 0
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@ -249,7 +249,7 @@ int main(int argc, char **argv)
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}
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if (!c->fn(argc - 1, argv + 1)) {
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//fprintf(stderr, "Command failed\n");
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fprintf(stderr, "Command failed\n");
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exit(1);
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}
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