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moby--moby/daemon/graphdriver/devmapper/devmapper_doc.go

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package devmapper // import "github.com/docker/docker/daemon/graphdriver/devmapper"
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// Definition of struct dm_task and sub structures (from lvm2)
//
// struct dm_ioctl {
// /*
// * The version number is made up of three parts:
// * major - no backward or forward compatibility,
// * minor - only backwards compatible,
// * patch - both backwards and forwards compatible.
// *
// * All clients of the ioctl interface should fill in the
// * version number of the interface that they were
// * compiled with.
// *
// * All recognized ioctl commands (ie. those that don't
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// * return -ENOTTY) fill out this field, even if the
// * command failed.
// */
// uint32_t version[3]; /* in/out */
// uint32_t data_size; /* total size of data passed in
// * including this struct */
// uint32_t data_start; /* offset to start of data
// * relative to start of this struct */
// uint32_t target_count; /* in/out */
// int32_t open_count; /* out */
// uint32_t flags; /* in/out */
// /*
// * event_nr holds either the event number (input and output) or the
// * udev cookie value (input only).
// * The DM_DEV_WAIT ioctl takes an event number as input.
// * The DM_SUSPEND, DM_DEV_REMOVE and DM_DEV_RENAME ioctls
// * use the field as a cookie to return in the DM_COOKIE
// * variable with the uevents they issue.
// * For output, the ioctls return the event number, not the cookie.
// */
// uint32_t event_nr; /* in/out */
// uint32_t padding;
// uint64_t dev; /* in/out */
// char name[DM_NAME_LEN]; /* device name */
// char uuid[DM_UUID_LEN]; /* unique identifier for
// * the block device */
// char data[7]; /* padding or data */
// };
// struct target {
// uint64_t start;
// uint64_t length;
// char *type;
// char *params;
// struct target *next;
// };
// typedef enum {
// DM_ADD_NODE_ON_RESUME, /* add /dev/mapper node with dmsetup resume */
// DM_ADD_NODE_ON_CREATE /* add /dev/mapper node with dmsetup create */
// } dm_add_node_t;
// struct dm_task {
// int type;
// char *dev_name;
// char *mangled_dev_name;
// struct target *head, *tail;
// int read_only;
// uint32_t event_nr;
// int major;
// int minor;
// int allow_default_major_fallback;
// uid_t uid;
// gid_t gid;
// mode_t mode;
// uint32_t read_ahead;
// uint32_t read_ahead_flags;
// union {
// struct dm_ioctl *v4;
// } dmi;
// char *newname;
// char *message;
// char *geometry;
// uint64_t sector;
// int no_flush;
// int no_open_count;
// int skip_lockfs;
// int query_inactive_table;
// int suppress_identical_reload;
// dm_add_node_t add_node;
// uint64_t existing_table_size;
// int cookie_set;
// int new_uuid;
// int secure_data;
// int retry_remove;
// int enable_checks;
// int expected_errno;
// char *uuid;
// char *mangled_uuid;
// };
//