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mirror_zfs/module/zfs
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Brian Behlendorf f74fae8b30 Fix 4K sector support 
Yesterday I ran across a 3TB drive which exposed 4K sectors to
Linux.  While I thought I had gotten this support correct it
turns out there were 2 subtle bugs which prevented it from
working.

  sudo ./cmd/zpool/zpool create -f large-sector /dev/sda
  cannot create 'large-sector': one or more devices is currently unavailable

1) The first issue was that it was possible that bdev_capacity()
would return the number of 512 byte sectors rather than the number
of 4096 sectors.  Internally, certain Linux functions only operate
with 512 byte sectors so you need to be careful.  To avoid any
confusion in the future I've updated bdev_capacity() to simply
return the device (or partition) capacity in bytes.  The higher
levels of ZFS want the value in bytes anyway so this is cleaner.

2) When creating a bio the ->bi_sector count must always be
expressed in 512 byte sectors.  The existing code would scale
the byte offset by the logical sector size.   Until now this was
always 512 so it never caused problems.  Trying a 4K sector drive
clearly exposed the issue.  The problem has been fixed by
hard coding the 512 byte sector which is exactly what the bio
code does internally.

With these changes I'm now able to create ZFS pools using 4K
sector drives.  No issues were observed during fairly extensive
testing.  This is also a low risk change if your using 512b
sectors devices because none of the logic changes.

Closes #256
2011-05-27 11:38:53 -07:00
..
arc.c Fix 'negative objects to delete' warning 2011-05-18 10:29:22 -07:00
bplist.c Fix gcc missing parenthesis warnings 2010-08-31 08:38:35 -07:00
bpobj.c Update to onnv_147 2010-08-26 14:24:34 -07:00
dbuf.c Add linux kernel module support 2010-08-31 13:41:58 -07:00
ddt_zap.c Update core ZFS code from build 121 to build 141. 2010-05-28 13:45:14 -07:00
ddt.c Add missing ZFS tunables 2011-05-04 10:02:37 -07:00
dmu_diff.c Update to onnv_147 2010-08-26 14:24:34 -07:00
dmu_object.c Add linux kernel module support 2010-08-31 13:41:58 -07:00
dmu_objset.c Merge branch 'zpl' 2011-02-18 09:31:25 -08:00
dmu_send.c Add linux kernel memory support 2010-08-31 13:41:57 -07:00
dmu_traverse.c Add missing ZFS tunables 2011-05-04 10:02:37 -07:00
dmu_tx.c Add linux kernel module support 2010-08-31 13:41:58 -07:00
dmu_zfetch.c Add missing ZFS tunables 2011-05-04 10:02:37 -07:00
dmu.c Suppress large kmem_alloc() warning 2011-02-10 09:27:22 -08:00
dnode_sync.c Fix dbuf eviction assertion 2010-08-31 08:38:45 -07:00
dnode.c Quiet down very frequent large allocation warning in ZFS. 2010-09-17 16:24:15 -07:00
dsl_dataset.c Prototype/structure update for Linux 2011-02-10 09:27:21 -08:00
dsl_deadlist.c Update core ZFS code from build 121 to build 141. 2010-05-28 13:45:14 -07:00
dsl_deleg.c Add linux kernel module support 2010-08-31 13:41:58 -07:00
dsl_dir.c Add linux kernel module support 2010-08-31 13:41:58 -07:00
dsl_pool.c Add missing ZFS tunables 2011-05-04 10:02:37 -07:00
dsl_prop.c Fix enum compiler warning 2011-02-23 12:52:51 -08:00
dsl_scan.c Add missing ZFS tunables 2011-05-04 10:02:37 -07:00
dsl_synctask.c Add linux kernel module support 2010-08-31 13:41:58 -07:00
fm.c Add missing ZFS tunables 2011-05-04 10:02:37 -07:00
gzip.c Fix zmod.h usage in userspace 2010-08-31 08:38:46 -07:00
lzjb.c Fix stack lzjb 2010-08-31 08:38:49 -07:00
Makefile.in Implemented NFS export_operations. 2011-04-29 12:36:13 -07:00
metaslab.c Fix metaslab 2010-08-31 08:38:45 -07:00
refcount.c Fix gcc uninitialized variable warnings 2010-08-31 08:38:43 -07:00
rrwlock.c Enable rrwlock.c compilation 2010-12-07 16:05:25 -08:00
sa.c Enable zfs_znode compilation 2011-02-10 09:27:20 -08:00
sha256.c Add linux sha2 support 2010-08-31 13:41:59 -07:00
spa_boot.c Add linux kernel module support 2010-08-31 13:41:58 -07:00
spa_config.c Prototype/structure update for Linux 2011-02-10 09:27:21 -08:00
spa_errlog.c Add linux kernel module support 2010-08-31 13:41:58 -07:00
spa_history.c Add linux kernel module support 2010-08-31 13:41:58 -07:00
spa_misc.c Add missing ZFS tunables 2011-05-04 10:02:37 -07:00
spa.c Disable direct reclaim for z_wr_* threads 2011-05-06 15:26:26 -07:00
space_map.c Update core ZFS code from build 121 to build 141. 2010-05-28 13:45:14 -07:00
txg.c Fix ASSERTION(!dsl_pool_sync_context(tx->tx_pool)) 2011-04-07 09:52:16 -07:00
uberblock.c Update core ZFS code from build 121 to build 141. 2010-05-28 13:45:14 -07:00
unique.c Fix gcc ident pragma warnings 2010-08-27 15:34:02 -07:00
vdev_cache.c Add missing ZFS tunables 2011-05-04 10:02:37 -07:00
vdev_disk.c Fix 4K sector support 2011-05-27 11:38:53 -07:00
vdev_file.c Prototype/structure update for Linux 2011-02-10 09:27:21 -08:00
vdev_label.c Fix gcc uninitialized variable warnings 2010-08-31 08:38:43 -07:00
vdev_mirror.c Fix gcc c90 compliance warnings 2010-08-27 15:28:32 -07:00
vdev_missing.c Update core ZFS code from build 121 to build 141. 2010-05-28 13:45:14 -07:00
vdev_queue.c Add missing ZFS tunables 2011-05-04 10:02:37 -07:00
vdev_raidz.c Fix variables named current 2010-08-31 08:38:44 -07:00
vdev_root.c Fix gcc c90 compliance warnings 2010-08-27 15:28:32 -07:00
vdev.c Add missing ZFS tunables 2011-05-04 10:02:37 -07:00
zap_leaf.c Fix gcc uninitialized variable warnings 2010-08-31 08:38:43 -07:00
zap_micro.c Add linux kernel module support 2010-08-31 13:41:58 -07:00
zap.c Fix rw_init() usage 2010-08-31 08:38:46 -07:00
zfs_acl.c Prototype/structure update for Linux 2011-02-10 09:27:21 -08:00
zfs_byteswap.c Add linux kernel module support 2010-08-31 13:41:58 -07:00
zfs_debug.c Update core ZFS code from build 121 to build 141. 2010-05-28 13:45:14 -07:00
zfs_dir.c Added missing initialization for va.va_dentry in zfs_get_xattrdir. 2011-04-19 13:57:41 -07:00
zfs_fm.c Initial zio delay timing 2010-10-12 14:55:02 -07:00
zfs_fuid.c Drop HAVE_XVATTR macros 2011-03-02 11:44:34 -08:00
zfs_ioctl.c Use vmem_alloc() for zfs_ioc_userspace_many() 2011-05-20 14:23:18 -07:00
zfs_log.c Drop HAVE_XVATTR macros 2011-03-02 11:44:34 -08:00
zfs_onexit.c Add linux kernel device support 2010-08-31 13:41:50 -07:00
zfs_replay.c Use Linux ATTR_ versions 2011-03-03 11:29:15 -08:00
zfs_rlock.c Range lock performance improvements 2011-03-08 12:44:06 -08:00
zfs_sa.c Drop HAVE_XVATTR macros 2011-03-02 11:44:34 -08:00
zfs_vfsops.c Implemented NFS export_operations. 2011-04-29 12:36:13 -07:00
zfs_vnops.c Update synchronous open zfs_close() comment 2011-05-13 08:20:06 -07:00
zfs_znode.c Don't store rdev in SA for FIFOs and sockets 2011-05-09 13:35:07 -07:00
zil.c Add missing ZFS tunables 2011-05-04 10:02:37 -07:00
zio_checksum.c Update core ZFS code from build 121 to build 141. 2010-05-28 13:45:14 -07:00
zio_compress.c Update core ZFS code from build 121 to build 141. 2010-05-28 13:45:14 -07:00
zio_inject.c Add missing ZFS tunables 2011-05-04 10:02:37 -07:00
zio.c Add missing ZFS tunables 2011-05-04 10:02:37 -07:00
zle.c Update core ZFS code from build 121 to build 141. 2010-05-28 13:45:14 -07:00
zpl_export.c Implemented NFS export_operations. 2011-04-29 12:36:13 -07:00
zpl_file.c Handle NULL in nfsd .fsync() hook 2011-05-06 12:33:45 -07:00
zpl_inode.c Don't store rdev in SA for FIFOs and sockets 2011-05-09 13:35:07 -07:00
zpl_super.c Implemented NFS export_operations. 2011-04-29 12:36:13 -07:00
zpl_xattr.c Truncate the xattr znode when updating existing attributes. 2011-04-19 14:14:40 -07:00
zrlock.c Export ZFS symbols needed by Lustre. 2010-09-17 16:24:15 -07:00
zvol.c Fix 'zfs set volsize=N pool/dataset' 2011-05-02 08:54:40 -07:00