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b18019d2d8
zvol_write() assumes that the write request must be written to stable storage
if rq_is_sync() is true. Unfortunately, this assumption is incorrect. Indeed,
"sync" does *not* mean what we think it means in the context of the Linux
block layer. This is well explained in linux/fs.h:
WRITE: A normal async write. Device will be plugged.
WRITE_SYNC: Synchronous write. Identical to WRITE, but passes down
the hint that someone will be waiting on this IO
shortly.
WRITE_FLUSH: Like WRITE_SYNC but with preceding cache flush.
WRITE_FUA: Like WRITE_SYNC but data is guaranteed to be on
non-volatile media on completion.
In other words, SYNC does not *mean* that the write must be on stable storage
on completion. It just means that someone is waiting on us to complete the
write request. Thus triggering a ZIL commit for each SYNC write request on a
ZVOL is unnecessary and harmful for performance. To make matters worse, ZVOL
users have no way to express that they actually want data to be written to
stable storage, which means the ZIL is broken for ZVOLs.
The request for stable storage is expressed by the FUA flag, so we must
commit the ZIL after the write if the FUA flag is set. In addition, we must
commit the ZIL before the write if the FLUSH flag is set.
Also, we must inform the block layer that we actually support FLUSH and FUA.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
278 lines
6.3 KiB
C
278 lines
6.3 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_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_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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/* 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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/* 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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