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libdasd: Provide function to utilise release space ioctl

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The BIODASDRAS (Release Allocated Space) ioctl allows to release
track-wise or full space of an Extent Space Efficient DASD volume.

Provide a library function to utilise this functionality.

Reviewed-by: Stefan Haberland <sth@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Jan Höppner
2019-03-05 15:32:51 +01:00
parent 8023a72b11
commit 96f13ead2b
2 changed files with 24 additions and 0 deletions
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4
include/lib/dasd_base.h
View File

@@ -157,6 +157,7 @@ typedef struct format_data_t {
#define DASD_FMT_INT_INVAL 4 /* invalidate tracks */
#define DASD_FMT_INT_COMPAT 8 /* use OS/390 compatible disk layout */
#define DASD_FMT_INT_FMT_NOR0 16 /* remove permission to write record zero */
#define DASD_FMT_INT_ESE_FULL 32 /* release space for entire volume */
/*
* struct format_check_t
@@ -210,6 +211,8 @@ struct hd_geometry {
#define BIODASDINFO2 _IOR(DASD_IOCTL_LETTER, 3, dasd_information2_t)
/* #define BIODASDFORMAT _IOW(IOCTL_LETTER,0,format_data_t) , deprecated */
#define BIODASDFMT _IOW(DASD_IOCTL_LETTER, 1, format_data_t)
/* Release Allocated Space */
#define BIODASDRAS _IOW(DASD_IOCTL_LETTER, 3, format_data_t)
/* Check device format according to format_data_t */
#define BIODASDCHECKFMT _IOWR(DASD_IOCTL_LETTER, 2, format_check_t)
@@ -233,6 +236,7 @@ int dasd_check_format(const char *device, format_check_t *p);
int dasd_format_disk(int fd, format_data_t *p);
int dasd_disk_disable(const char *device, int *fd);
int dasd_disk_enable(int fd);
int dasd_release_space(const char *device, format_data_t *r);
int dasd_get_blocksize(const char *device, unsigned int *blksize);
int dasd_get_blocksize_in_bytes(const char *device, unsigned long long *blksize);
int dasd_get_geo(const char *device, struct hd_geometry *geo);

20
libdasd/dasd_ioctl.c
View File

@@ -228,6 +228,26 @@ int dasd_check_format(const char *device, format_check_t *p)
return 0;
}
/*
* Release Allocated Space
*
* @param[in] fd device node's file descriptor
* @param[in] r format options
*
* @retval 0 in case of success
* @retval errno in case of failure
*/
int dasd_release_space(const char *device, format_data_t *r)
{
int fd;
fd = dasd_open_device(device, O_RDONLY);
RUN_IOCTL(fd, BIODASDRAS, r);
dasd_close_device(fd);
return 0;
}
/*
* Reread partition table
*