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https://git.proxmox.com/git/mirror_zfs.git
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ee5fd0bb80
Currently, zvols have a discard granularity set to 0, which suggests to the upper layer that discard requests of arbirarily small size and alignment can be made efficiently. In practice however, ZFS does not handle unaligned discard requests efficiently: indeed, it is unable to free a part of a block. It will write zeros to the specified range instead, which is both useless and inefficient (see dnode_free_range). With this patch, zvol block devices expose volblocksize as their discard granularity, so the upper layer is aware that it's not supposed to send discard requests smaller than volblocksize. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #862
335 lines
7.6 KiB
C
335 lines
7.6 KiB
C
/* zfs_config.h.in. Generated from configure.ac by autoheader. */
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/* Define to 1 to enabled dmu tx validation */
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#undef DEBUG_DMU_TX
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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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/* blkdev_get() wants 3 args */
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#undef HAVE_3ARG_BLKDEV_GET
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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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/* dops->automount() exists */
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#undef HAVE_AUTOMOUNT
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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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/* clear_inode() is available */
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#undef HAVE_CLEAR_INODE
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/* super_block uses const struct xattr_hander */
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#undef HAVE_CONST_XATTR_HANDLER
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/* iops->create()/mkdir()/mknod() take umode_t */
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#undef HAVE_CREATE_UMODE_T
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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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/* ql->discard_granularity is available */
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#undef HAVE_DISCARD_GRANULARITY
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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_make_root() is available */
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#undef HAVE_D_MAKE_ROOT
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/* d_obtain_alias() is available */
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#undef HAVE_D_OBTAIN_ALIAS
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/* eops->encode_fh() wants child and parent inodes */
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#undef HAVE_ENCODE_FH_WITH_INODE
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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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/* get_gendisk() is available */
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#undef HAVE_GET_GENDISK
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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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/* iops->truncate_range() exists */
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#undef HAVE_INODE_TRUNCATE_RANGE
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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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/* zfs debugging enabled */
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#undef ZFS_DEBUG
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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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