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30930fba21
DISCARD (REQ_DISCARD, BLKDISCARD) is useful for thin provisioning. It allows ZVOL clients to discard (unmap, trim) block ranges from a ZVOL, thus optimizing disk space usage by allowing a ZVOL to shrink instead of just grow. We can't use zfs_space() or zfs_freesp() here, since these functions only work on regular files, not volumes. Fortunately we can use the low-level function dmu_free_long_range() which does exactly what we want. Currently the discard operation is not added to the log. That's not a big deal since losing discard requests cannot result in data corruption. It would however result in disk space usage higher than it should be. Thus adding log support to zvol_discard() is probably a good idea for a future improvement. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
302 lines
6.9 KiB
C
302 lines
6.9 KiB
C
/* zfs_config.h.in. Generated from configure.ac by autoheader. */
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/* invalidate_bdev() wants 1 arg */
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#undef HAVE_1ARG_INVALIDATE_BDEV
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/* bio_end_io_t wants 2 args */
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#undef HAVE_2ARGS_BIO_END_IO_T
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/* security_inode_init_security wants 6 args */
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#undef HAVE_6ARGS_SECURITY_INODE_INIT_SECURITY
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/* struct block_device_operations use bdevs */
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#undef HAVE_BDEV_BLOCK_DEVICE_OPERATIONS
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/* bdev_logical_block_size() is available */
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#undef HAVE_BDEV_LOGICAL_BLOCK_SIZE
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/* struct super_block has s_bdi */
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#undef HAVE_BDI
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/* bdi_setup_and_register() is available */
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#undef HAVE_BDI_SETUP_AND_REGISTER
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/* bio_empy_barrier() is defined */
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#undef HAVE_BIO_EMPTY_BARRIER
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/* REQ_FAILFAST_MASK is defined */
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#undef HAVE_BIO_REQ_FAILFAST_MASK
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/* BIO_RW_FAILFAST is defined */
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#undef HAVE_BIO_RW_FAILFAST
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/* BIO_RW_FAILFAST_* are defined */
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#undef HAVE_BIO_RW_FAILFAST_DTD
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/* BIO_RW_SYNC is defined */
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#undef HAVE_BIO_RW_SYNC
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/* BIO_RW_SYNCIO is defined */
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#undef HAVE_BIO_RW_SYNCIO
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/* blkdev_get_by_path() is available */
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#undef HAVE_BLKDEV_GET_BY_PATH
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/* blk_end_request() is available */
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#undef HAVE_BLK_END_REQUEST
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/* blk_end_request() is GPL-only */
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#undef HAVE_BLK_END_REQUEST_GPL_ONLY
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/* blk_fetch_request() is available */
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#undef HAVE_BLK_FETCH_REQUEST
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/* blk_queue_discard() is available */
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#undef HAVE_BLK_QUEUE_DISCARD
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/* blk_queue_flush() is available */
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#undef HAVE_BLK_QUEUE_FLUSH
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/* blk_queue_flush() is GPL-only */
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#undef HAVE_BLK_QUEUE_FLUSH_GPL_ONLY
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/* blk_queue_io_opt() is available */
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#undef HAVE_BLK_QUEUE_IO_OPT
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/* blk_queue_max_hw_sectors() is available */
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#undef HAVE_BLK_QUEUE_MAX_HW_SECTORS
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/* blk_queue_max_segments() is available */
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#undef HAVE_BLK_QUEUE_MAX_SEGMENTS
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/* blk_queue_nonrot() is available */
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#undef HAVE_BLK_QUEUE_NONROT
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/* blk_queue_physical_block_size() is available */
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#undef HAVE_BLK_QUEUE_PHYSICAL_BLOCK_SIZE
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/* blk_requeue_request() is available */
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#undef HAVE_BLK_REQUEUE_REQUEST
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/* blk_rq_bytes() is available */
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#undef HAVE_BLK_RQ_BYTES
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/* blk_rq_bytes() is GPL-only */
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#undef HAVE_BLK_RQ_BYTES_GPL_ONLY
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/* blk_rq_pos() is available */
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#undef HAVE_BLK_RQ_POS
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/* blk_rq_sectors() is available */
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#undef HAVE_BLK_RQ_SECTORS
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/* security_inode_init_security wants callback */
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#undef HAVE_CALLBACK_SECURITY_INODE_INIT_SECURITY
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/* check_disk_size_change() is available */
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#undef HAVE_CHECK_DISK_SIZE_CHANGE
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/* super_block uses const struct xattr_hander */
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#undef HAVE_CONST_XATTR_HANDLER
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/* xattr_handler->get() wants dentry */
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#undef HAVE_DENTRY_XATTR_GET
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/* xattr_handler->set() wants dentry */
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#undef HAVE_DENTRY_XATTR_SET
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/* Define to 1 if you have the <dlfcn.h> header file. */
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#undef HAVE_DLFCN_H
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/* d_obtain_alias() is available */
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#undef HAVE_D_OBTAIN_ALIAS
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/* sops->evict_inode() exists */
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#undef HAVE_EVICT_INODE
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/* fops->fallocate() exists */
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#undef HAVE_FILE_FALLOCATE
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/* kernel defines fmode_t */
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#undef HAVE_FMODE_T
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/* sops->free_cached_objects() exists */
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#undef HAVE_FREE_CACHED_OBJECTS
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/* fops->fsync() with range */
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#undef HAVE_FSYNC_RANGE
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/* fops->fsync() without dentry */
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#undef HAVE_FSYNC_WITHOUT_DENTRY
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/* fops->fsync() with dentry */
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#undef HAVE_FSYNC_WITH_DENTRY
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/* blk_disk_ro() is available */
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#undef HAVE_GET_DISK_RO
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/* Define to 1 if licensed under the GPL */
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#undef HAVE_GPL_ONLY_SYMBOLS
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/* fops->fallocate() exists */
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#undef HAVE_INODE_FALLOCATE
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/* insert_inode_locked() is available */
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#undef HAVE_INSERT_INODE_LOCKED
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/* Define to 1 if you have the <inttypes.h> header file. */
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#undef HAVE_INTTYPES_H
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/* result=stropts.h Define to 1 if ioctl() defined in <stropts.h> */
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#undef HAVE_IOCTL_IN_STROPTS_H
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/* Define to 1 if ioctl() defined in <sys/ioctl.h> */
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#undef HAVE_IOCTL_IN_SYS_IOCTL_H
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/* Define to 1 if ioctl() defined in <unistd.h> */
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#undef HAVE_IOCTL_IN_UNISTD_H
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/* kernel defines KOBJ_NAME_LEN */
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#undef HAVE_KOBJ_NAME_LEN
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/* Define if you have libblkid */
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#undef HAVE_LIBBLKID
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/* Define if you have selinux */
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#undef HAVE_LIBSELINUX
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/* Define if you have libuuid */
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#undef HAVE_LIBUUID
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/* Define to 1 if you have the `z' library (-lz). */
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#undef HAVE_LIBZ
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/* Define to 1 if you have the <memory.h> header file. */
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#undef HAVE_MEMORY_H
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/* mount_nodev() is available */
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#undef HAVE_MOUNT_NODEV
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/* sops->nr_cached_objects() exists */
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#undef HAVE_NR_CACHED_OBJECTS
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/* open_bdev_exclusive() is available */
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#undef HAVE_OPEN_BDEV_EXCLUSIVE
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/* REQ_SYNC is defined */
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#undef HAVE_REQ_SYNC
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/* rq_for_each_segment() is available */
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#undef HAVE_RQ_FOR_EACH_SEGMENT
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/* rq_is_sync() is available */
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#undef HAVE_RQ_IS_SYNC
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/* set_nlink() is available */
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#undef HAVE_SET_NLINK
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/* sops->show_options() with dentry */
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#undef HAVE_SHOW_OPTIONS_WITH_DENTRY
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/* struct super_block has s_shrink */
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#undef HAVE_SHRINK
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/* Define to 1 if you have the <stdint.h> header file. */
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#undef HAVE_STDINT_H
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/* Define to 1 if you have the <stdlib.h> header file. */
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#undef HAVE_STDLIB_H
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/* Define to 1 if you have the <strings.h> header file. */
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#undef HAVE_STRINGS_H
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/* Define to 1 if you have the <string.h> header file. */
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#undef HAVE_STRING_H
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/* Define to 1 if you have the <sys/stat.h> header file. */
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#undef HAVE_SYS_STAT_H
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/* Define to 1 if you have the <sys/types.h> header file. */
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#undef HAVE_SYS_TYPES_H
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/* truncate_setsize() is available */
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#undef HAVE_TRUNCATE_SETSIZE
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/* Define to 1 if you have the <unistd.h> header file. */
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#undef HAVE_UNISTD_H
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/* Define if you have zlib */
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#undef HAVE_ZLIB
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/* Define to the sub-directory in which libtool stores uninstalled libraries.
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*/
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#undef LT_OBJDIR
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/* Define to 1 if NPTL threading implementation includes guard area in stack
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allocation */
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#undef NPTL_GUARD_WITHIN_STACK
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/* Name of package */
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#undef PACKAGE
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/* Define to the address where bug reports for this package should be sent. */
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#undef PACKAGE_BUGREPORT
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/* Define to the full name of this package. */
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#undef PACKAGE_NAME
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/* Define to the full name and version of this package. */
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#undef PACKAGE_STRING
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/* Define to the one symbol short name of this package. */
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#undef PACKAGE_TARNAME
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/* Define to the version of this package. */
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#undef PACKAGE_VERSION
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/* Define to 1 if you have the ANSI C header files. */
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#undef STDC_HEADERS
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/* Version number of package */
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#undef VERSION
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/* Define the project alias string. */
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#undef ZFS_META_ALIAS
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/* Define the project author. */
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#undef ZFS_META_AUTHOR
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/* Define the project release date. */
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#undef ZFS_META_DATA
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/* Define the project license. */
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#undef ZFS_META_LICENSE
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/* Define the libtool library 'age' version information. */
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#undef ZFS_META_LT_AGE
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/* Define the libtool library 'current' version information. */
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#undef ZFS_META_LT_CURRENT
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/* Define the libtool library 'revision' version information. */
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#undef ZFS_META_LT_REVISION
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/* Define the project name. */
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#undef ZFS_META_NAME
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/* Define the project release. */
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#undef ZFS_META_RELEASE
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/* Define the project version. */
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#undef ZFS_META_VERSION
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#undef PACKAGE
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#undef PACKAGE_BUGREPORT
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#undef PACKAGE_NAME
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#undef PACKAGE_STRING
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#undef PACKAGE_TARNAME
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#undef PACKAGE_VERSION
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#undef STDC_HEADERS
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#undef VERSION
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