History log of /freebsd-9.3-release/sys/boot/zfs/zfs.c
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# 267654 19-Jun-2014 gjb

Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

# 243243 18-Nov-2012 ae

MFC 239054,239057,239058,239060,239066,239067,239068,239070,239073,
239087,239088,239127,239210,239211,239230,239231,239232,239243,
239292,239293,239294,239325,240272,240273,240274,240275,240276,
240277,240335,240481,241023,241047,241053,241065,241068,241069,
241070,241164,241809,241876

239054:
Create the interface to work with various partition tables from the
loader(8). The following partition tables are supported: BSD label, GPT,
MBR, EBR and VTOC8.
239057:
Remove unused variables.
239058:
Introduce new API to work with disks from the loader's drivers.
It uses new API from the part.c to work with partition tables.
239060:
When GPT signature is invalid in the primary GPT header, then try to
read backup GPT header.
239066:
Add offset field to the i386_devdesc structure to be compatible with
disk_devdesc structure. Update biosdisk driver to the new disk API.
239067:
Remove unneeded flag.
239068:
Teach the ZFS use new partitions API when probing.
Note: now ZFS does probe only for partitions with type "freebsd-zfs"
and "freebsd".
239070:
Add simple test program that uses the partition tables handling code.
It is useful to test and debug how boot loader handles partition tables
metadata.
239073:
Bump USERBOOT_VERSION.
239087:
Add to the debug output the offset from the parent partitioning scheme.
239088:
Fix start offset calculation for the EBR partitions.
239127:
As it turned out, there are some installations, where BSD label
contains partitions with type zero. And it has worked.
So, allow detect these partitions.
239210:
Add more debug messages.
239211:
Add another debug message.
239230:
Unbreak booting from the true dedicated disks.
When we open the disk, check the type of partition table, that has
been detected. If this is BSD label, then we assume this is DD mode.
239231:
Remove colons from the debug message, device name returned by the
disk_fmtdev() already has the colons.
239232:
Restore the old behaviour. If requested partition is a BSD slice,
but d_partition isn't explicitly set, then try to open BSD label and its
first partition.
239243:
After r239066, reinitialize v86.ctl and v86.addr for int 13 EDD probing
in sys/boot/i386/libi386/biosdisk.c. Otherwise, when DISK_DEBUG is
enabled, the DEBUG() macros will clobber those fields, and cause the
probing to always fail mysteriously when debugging is enabled.
239292:
Explicitly terminate the string after strncpy(3).
239293:
Rework r239232 to unbreak ZFS detection on MBR slices.
239294:
Some BIOSes return incorrect number of sectors, make checks less
strictly, to do not lost some partitions.
239325:
Add comment why the code has been disabled.
240272:
Make struct uboot_devdesc compatible with struct disk_devdesc.
240273:
Use disk_fmtdev() and disk_parsedev() functions from the new DISK API.
240274:
Update uboot's disk driver to use new DISK API.
240275:
Build disk.c only when DISK_SUPPORT is enabled.
240276:
Update according to the change of struct uboot_devdesc.
240277:
Handle LOADER_NO_DISK_SUPPORT knob in the arm and powerpc ubldr.
240335:
Slightly reduce an overhead for the open() call in the zfsloader.
libstand(3) tries to detect file system in the predefined order,
but zfsloader usually is used for the booting from ZFS, and there is
no need to try detect several file system types for each open() call.
240481:
The MBR data is not necessarily aligned. This is a problem on ARM.
241023:
Make the loader a bit smarter, when it tries to open disk and the slice
number is not exactly specified. When the disk has MBR, also try to read
BSD label after ptable_getpart() call. When the disk has GPT, also set
d_partition to 255. Mostly, this is how it worked before.
241047:
Disable splitfs support, since we aren't support floppies for a long
time. This slightly reduces an overhead, when loader tries to open
file that doesn't exist.
241053:
Almost each time when loader opens a file, this leads to calling
disk_open(). Very often this is called several times for one file.
This leads to reading partition table metadata for each call. To
reduce the number of disk I/O we have a simple block cache, but it
is very dumb and more than half of I/O operations related to reading
metadata, misses this cache.

Introduce new cache layer to resolve this problem. It is independent
and doesn't need initialization like bcache, and will work by default
for all loaders which use the new DISK API. A successful disk_open()
call to each new disk or partition produces new entry in the cache.
Even more, when disk was already open, now opening of any nested
partitions does not require reading top level partition table.
So, if without this cache, partition table metadata was read around
20-50 times during boot, now it reads only once. This affects the booting
from GPT and MBR from the UFS.
241065:
Fix disk_cleanup() to work without DISK_DEBUG too.
241068:
Reduce the number of attempts to detect proper kld format for the amd64
loader.
241069:
Remember the file format of the last loaded module and try to use it for
next files.
241070:
Fix the style.
241164:
Replace all references to loader_callbacks_v1 with loader_callbacks.
241809:
Add the flags parameter to the disk_open() function and DISK_F_NOCACHE
flag, that disables the caching of partition tables metadata.
Use this flag for floppies in the libi386/biosdisk driver.
241876:
When loader tries to open GPT partition, but partition table is not GPT,
then try automatically detect an appropriate partition type.


# 242234 28-Oct-2012 avg

MFC r241292: zfs loader: treat plain pool name as a name of its root
dataset


# 242230 28-Oct-2012 avg

MFC r241289: boot/zfs: call zfs_spa_init for all found pools


# 242229 28-Oct-2012 avg

MFC r241283: zfs boot: add code for listing child datasets of a given
dataset


# 241532 14-Oct-2012 avg

MFC r241282: zfs boot: chose a "first" pool if none is explicitly requested


# 241530 14-Oct-2012 avg

MFC r241290: boot/zfs: a small whitespace cleanup


# 240837 22-Sep-2012 avg

MFC r240346,240356: zfs boot: bring zap_leaf_chunk field names in sync
with kernel code


# 237771 29-Jun-2012 avg

MFC r235390: zfs boot code: mark spa_t arguments as const where they are
used as such


# 237770 29-Jun-2012 avg

MFC r235392,235394,235395: fixes and cleanups for zfs boot MFC


# 237766 29-Jun-2012 avg

MFC r235329,235343,235361,235364: zfsboot/zfsloader: support accessing
filesystems within a pool


# 236076 26-May-2012 marius

MFC: r234898, r235207

Add initial support for booting from ZFS on sparc64. At least on Sun Fire
V100, the firmware is known to be broken and not allowing to simultaneously
open disk devices, causing attempts to boot from a mirror or RAIDZ to cause
a crash. This will be worked around later. The firmwares of newer sun4u models
don't seem to exhibit this problem though.

PR: 165025
Submitted by: Gavin Mu


# 225736 22-Sep-2011 kensmith

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)


# 219089 27-Feb-2011 pjd

Finally... Import the latest open-source ZFS version - (SPA) 28.

Few new things available from now on:

- Data deduplication.
- Triple parity RAIDZ (RAIDZ3).
- zfs diff.
- zpool split.
- Snapshot holds.
- zpool import -F. Allows to rewind corrupted pool to earlier
transaction group.
- Possibility to import pool in read-only mode.

MFC after: 1 month


# 212804 17-Sep-2010 pjd

Remove magic value.


# 208669 31-May-2010 avg

zfs boot: fix error handling in zfs_readdir

Found by: clang static analyzer
MFC after: 4 days


# 204067 18-Feb-2010 pjd

Update comment. We also look for GPT partitions.


# 198420 23-Oct-2009 rnoland

Correct some issues with zfs boot.

- Teach it to read gang blocks. (essentially untested)
If you see "ZFS: gang block detected!", please let
me know, so we can either remove the printf if it
works, or fix it if it doesn't.

- If multiple partitions exist on a disk, probe them all.
We also need to reset dsk->start to 0 to read the right
sector here.

- With GPT, we can have 128 partitions.

- If the bootfs property has ever been set on a pool
it seems that it never goes away. zpool won't allow
you to add to the pool with the bootfs property set.
However, if you clear the property back to default
we end up getting 0 for the object number and read
a bogus block pointer and fail to boot.

- Fix some error printfs. The printf in the loader is
only capable of c,s and u formats.

- Teach printf how to display %llu

Reviewed by: dfr, jhb
MFC after: 2 weeks


# 185938 11-Dec-2008 ps

Fix a leak introduced in r185902. We should free the devspec if
we've successfully found a zfs pool.


# 185902 11-Dec-2008 ps

Avoid a double free in devopen by not freeing the device structure
in zfs_dev_open. This stops a panic in the loader when trying to
read from a zfs device and no zfs devices exist.


# 185096 19-Nov-2008 dfr

Add a GPT-aware variant of zfsboot which should be used in a similar manner
to gptboot, i.e. installed in a freebsd-boot partition using /sbin/gpart or
/sbin/gpt.

Tweak the /boot/loader ZFS support so that it can find ZFS pools that are
contained in GPT partitions.


# 185029 17-Nov-2008 pjd

Update ZFS from version 6 to 13 and bring some FreeBSD-specific changes.

This bring huge amount of changes, I'll enumerate only user-visible changes:

- Delegated Administration

Allows regular users to perform ZFS operations, like file system
creation, snapshot creation, etc.

- L2ARC

Level 2 cache for ZFS - allows to use additional disks for cache.
Huge performance improvements mostly for random read of mostly
static content.

- slog

Allow to use additional disks for ZFS Intent Log to speed up
operations like fsync(2).

- vfs.zfs.super_owner

Allows regular users to perform privileged operations on files stored
on ZFS file systems owned by him. Very careful with this one.

- chflags(2)

Not all the flags are supported. This still needs work.

- ZFSBoot

Support to boot off of ZFS pool. Not finished, AFAIK.

Submitted by: dfr

- Snapshot properties

- New failure modes

Before if write requested failed, system paniced. Now one
can select from one of three failure modes:
- panic - panic on write error
- wait - wait for disk to reappear
- continue - serve read requests if possible, block write requests

- Refquota, refreservation properties

Just quota and reservation properties, but don't count space consumed
by children file systems, clones and snapshots.

- Sparse volumes

ZVOLs that don't reserve space in the pool.

- External attributes

Compatible with extattr(2).

- NFSv4-ACLs

Not sure about the status, might not be complete yet.

Submitted by: trasz

- Creation-time properties

- Regression tests for zpool(8) command.

Obtained from: OpenSolaris