libroot: generate a name for nameless volumes

Generate a name indicating the volume size and filesystem.

Remove code that was doing that or similar things in various
filesystems.

Change-Id: I6b993735e58cdfaf1f19af575e918614c7fe5679
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5381
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Jessica Hamilton <jessica.l.hamilton@gmail.com>
Reviewed-by: John Scipione <jscipione@gmail.com>

ext2: check volume state when mounting

we deny mounting read/write when not clean or with errors.

Change-Id: Ie0188319618d9d8e7199b308c007fbaeacaed87c
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5400
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Jérôme Duval <jerome.duval@gmail.com>

ext2: accept block count until the disk size plus one

my understanding is that it's possible that the last block (for instance of size 4KB)
is too large for the last few partition sectors, if the partition size isn't a multiple
of the block size.

Change-Id: I88c709d6e449aa52358fd9343c9f68f7ac1c01fe
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5399
Reviewed-by: Adrien Destugues <pulkomandy@pulkomandy.tk>
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>

Move DeviceOpener class to a separate file.

It is used by several of the filesystems, so it seems a good idea to
move it to the shared/ directory.

UFS2, BFS, XFS, EXT2 and EXFAT are adjusted.

Change-Id: I493e37a1e7d3ae24251469f82befd985a3c1dbdd
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2489
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>

ext2: report ext2/3/4 fs name depending on available features

Should help with #12157.

Change-Id: I7ea0310957c06606bc66a289afe8c3a78540a803
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2610
Reviewed-by: Kyle Ambroff-Kao <kyle@ambroffkao.com>
Reviewed-by: Jérôme Duval <jerome.duval@gmail.com>

ext2: fix panic mounting ext2-overwritten-with-BFS volumes

I have two partitions which used to be ext2, but have long since been
reinitialized as BFS. However, the ext2 superblock is still here, and
the ext2 filesystem will detect it. It crashes later on trying to access
an Inode at block -1, so just add a check for that to avoid the crash.

Change-Id: Ie2ed6a969ea3ffd343dedfe45a15dfc37af05804
Reviewed-on: https://review.haiku-os.org/c/haiku/+/1800
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

ext2: implements metadata_csum and 64bit features.

* Some PVS-Studio warnings are removed.
* fixes hardlink count in source and destination folders on rename.
* tested with fstorture and fsx (one job).
* add new definitions.
* import crc32c code from BSD.
* add some consistency checks at mount.
* DirectoryIterator::_AllocateBestEntryInBlock(), the direntry is checked for
consistency before using it, which should avoid crashing on bad data.
* DirectoryIterator::_SplitIndexedBlock(): the dotdot entry length should
include the dot and dotdot entries length.

Change-Id: I0f80d73b65b1ae6ddb2e746a6f85ef806f23dbb0
Reviewed-on: https://review.haiku-os.org/c/haiku/+/1735
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

file_systems: Pass size argument to ioctl in a lot more places.

style fixes

Build fix.

ext2: check some more values for ext2_super_block

Signed-off-by: Adrien Destugues <pulkomandy@pulkomandy.tk>

Fixes #13401.

ext2: fixes 64 bit warnings

Fix typos: super block -> superblock (#8974)

Signed-off-by: Przemysław Buczkowski <przemub@yahoo.pl>
Signed-off-by: Matt Madia <mattmadia@gmail.com>

Align all filesystem relevant places to use B_UNSUPPORTED for unsupported
instead of a mix of B_NOT_SUPPORTED and B_UNSUPPORTED. This allows checking for
a specific error code. Probably one of those should be phased out...


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@43025 a95241bf-73f2-0310-859d-f6bbb57e9c96

* support for setting volume label (bug #7100).
* minor cleanup


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@40243 a95241bf-73f2-0310-859d-f6bbb57e9c96

* manages blockgroups unused_inodes when the feature is available.
* BitmapBlock::FindMarked/FindUnmarked() tried to find a free bit
at the end of a full bitmap. This fixes #7069.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@40143 a95241bf-73f2-0310-859d-f6bbb57e9c96

* added flex group, dirnlink and gdtchecksum features for ext4.
* I reused crc_table.cpp from the UDF filesystem and switched it to have the reversed algorithm,
then generated the table in CRCTable.cpp
* added a binary search for extent tree leaves.
* fixed a check in InodeAllocator::New().


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@40129 a95241bf-73f2-0310-859d-f6bbb57e9c96

* added fsblock_t and fileblock_t definitions, used them when needed.
* validate fBlockShift in superblock.
* Volume::AllocateBlocks() now uses an absolute fsblock instead of a blockgroup related fsblock.
* AllocationBlockGroup now provides absolute fsblock values.
* added support for extents feature: ExtentStream class is the equivalent for DataStream class for extent operations.
The extent tree implementation is very basic, should work for normal growing/shrinking
operations, but not for sparse files. When enlarging a file and extent tree is full,
the root is moved in a new block and a new level is added on top. Extents can usually
be extended when adjacent blocks are allocated. Shrinking happens by removing leafs
one after another.
* removed empty IndexedDirectoryIterator.*


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@39886 a95241bf-73f2-0310-859d-f6bbb57e9c96

Stop the journal on Sync(), start the journal when a transaction is written. This helps with fs state on shutdown.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@39325 a95241bf-73f2-0310-859d-f6bbb57e9c96

Volume: don't use a block allocator when mounting readonly.
BitmapBlock: also use file system blocks, current type is off_t. Also added more trace.
BlockAllocator: added an assert and more trace


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@39302 a95241bf-73f2-0310-859d-f6bbb57e9c96

fixed warnings, added a better label for >1TB sized volumes


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@39253 a95241bf-73f2-0310-859d-f6bbb57e9c96

* switched more uint32 to off_t for 64bit support
* added error messages in InodeAllocator, Inode
* if BlockAllocator can't initialize, don't fail completely but switch to readonly
* fixed a bug in FindNextMarked() for bitmaps with a length non multiple of 32
* Inode::FindBlock() now returns an optional block_run length, useful for get_file_map()
* added flag for Inode for extents


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@39234 a95241bf-73f2-0310-859d-f6bbb57e9c96

* added some support for 64bit feature: extended struct ext2_block_group, block number types changed from uint32 to off_t
* added error traces, asserts
* BitmapBlock::CheckUnmarked() and CheckMarked() computed a wrong remainingBits and mask


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@39203 a95241bf-73f2-0310-859d-f6bbb57e9c96

added some definitions for readonly features
we already support the extra isize feature, so it's now added
removed unused Inode::AttributeBlockReadAt()
group_descriptor_size was previously a reserved field in the super block


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@39125 a95241bf-73f2-0310-859d-f6bbb57e9c96

added large files feature support


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@39120 a95241bf-73f2-0310-859d-f6bbb57e9c96

added some logs in case of errors.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@38992 a95241bf-73f2-0310-859d-f6bbb57e9c96

* added support for huge_file feature, untested (need a >2TB file)
* actually checks for readonly features if mounting read-write
* don't use a journal when mounting readonly
* DataStream::_BlocksNeeded(): in case of double or triple indirects,
compute the additional blocks needed using the difference between the
old and new indirects blocks. This was resulting in a bad NumBlocks on an inode
* BitmapBlock: mark methods missed an iteration when the startingBit was zero.
Some blocks were then allocated two times (at most 32 for each allocation run).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@38950 a95241bf-73f2-0310-859d-f6bbb57e9c96

Patch from Janito Ferreira Filho (aka jjvf): this is the result of his GSoC assignment "Implement ext2/3 Read and Write Support for Haiku".
* Tested and checked most features and fs operations, while passing successfully the Linux fsck. Though the implementation still needs more testing and is to be used with
caution, it's better in my mind to have the code committed now given the size of the patch.
* Code style isn't extensively checked but is mostly OK. Code review is welcome.
Some notes from Janito:
* Sparse files aren't supported and hard links aren't supported. Write attributes methods aren't activated nor tested.
* Journaling needs more testing to make sure it behaves in a compatible way to Ext3, and support for the different modes hasn't been implemented (due to the block
and file cache incompatibility). Correct revoke management is also lacking, as is proper management of the superblock state and copies and block group copies.
* The code is partly based and inspired by the BFS implementation. Author information might need to be fixed.

I'd like to congratulate and thank Janito for his hard work to bring the implementation to the current state. I hope he'll keep on maintaining it and become a regular
contributor/committer.



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@38573 a95241bf-73f2-0310-859d-f6bbb57e9c96

Patch from Janito Ferreira Filho (bug #5706): limit the Inode ID to the maximum number of Inodes. Thanks!


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@36358 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Volume::Unmount() never put the root node, and never deleted the volume's
block cache.
* Some cleanup.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@35069 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Of course I messed it up; now ext2 doesn't crash anymore when I mount
something it does support.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29511 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Added the new incompatible features of ext4.
* Now correctly only check for the incompatible features we do understand,
not for the ones we don't. Ie. we won't mount ext4 partitions anymore that
are using extents.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29510 a95241bf-73f2-0310-859d-f6bbb57e9c96

Remove the additional fs_vnode_ops arugment from get_vnode() again as it's not
needed at all when used as intended. Thanks Ingo for the explanation on how this
is intended to work. Adjusted the overlay fs accordingly and updated/reverted
the changes to the other filesystems.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29250 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Add an additional argument to get_vnode() that gets the fs_vnode_ops of the
node. That is needed for a layered filesystem to be able to construct a full
fs_vnode out of a volume/inode pair.
* Adapt places where get_vnode is used. Sadly this is a C API and we can't just
use a default NULL for that argument.
* Introduce a flag B_VNODE_WANTS_OVERLAY_SUB_NODE that can be returned in the
flags field of a fs get_vnode call. A filesystem can use this flag to indicate
that it doesn't support the full set of fs features (attributes, write support)
and it'd like to have unsupported calls emulated by an overlay sub node.
* Add a perliminary overlay filesystem that emulates file attributes using files
on a filesystem where attributes aren't supported. It does currently only
support reading attributes/attribute directories though. All other calls are
just passed through to the super filesystem.
* Adjust places where a HAS_FS_CALL() is taken as a guarantee that the operation
is supported. For the overlay filesystem we may later return a B_UNSUPPORTED,
so make sure that in that case proper fallback options are taken.
* Make the iso9660 filesystem request overlay sub nodes. This can be fine tuned
later to only trigger where there are features on a CD that need emulation
at all.

If you happened to know the attribute file format and location you could build
an iso with read-only attribute support now. Note that this won't be enough to
get a bootable iso-only image as the query and index support is yet missing.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29177 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Changed to use Volume::InodeSize() over sizeof(ext2_inode) as described
in ticket #2707. Thanks Adrian!


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@28536 a95241bf-73f2-0310-859d-f6bbb57e9c96

Add missing string.h that would otherwise soon break the build.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26453 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Now prints the disk size as part of the default name so that different
volumes are easier to differentiate.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26241 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Cast block before shifting, as suggested by Marcus; it shouldn't have any
actual consequences but looks more correct.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26217 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Fixed wrong group block offset computation: the
ext2_super_block::first_data_block must be used; the superblock offset
doesn't matter if the block size is greater than 2KB.
* Fixed block access beyond the 4GB limit - we need to cast the block to
a 64 bit type in ext2_get_file_map() before shifting it.
* Tested with various larger ext3 disks, and everything seems to work fine.
* Added some optional debug output.
* Minor cleanup.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26213 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Implemented a read-only ext2 file system.
* It's not yet complete, doesn't support some ext2 stuff (like files over 4 GB),
and might have some other bugs (I only tested it with a single 20 MB ext2
image).
* To have a read/write ext2 file system, it would probably make more sense to
port GNU sources (like ext2fs lib), and use that. But a small read-only ext2
file sytem doesn't hurt, I think, and I don't know if ext2fs lib would be
feasible for kernel use (porting the file system from Linux directly would
also be an alternative, but probably more work).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26187 a95241bf-73f2-0310-859d-f6bbb57e9c96

ext2: fixes 64 bit warnings

Fix typos: super block -> superblock (#8974)

Signed-off-by: Przemysław Buczkowski <przemub@yahoo.pl>
Signed-off-by: Matt Madia <mattmadia@gmail.com>

Align all filesystem relevant places to use B_UNSUPPORTED for unsupported
instead of a mix of B_NOT_SUPPORTED and B_UNSUPPORTED. This allows checking for
a specific error code. Probably one of those should be phased out...


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@43025 a95241bf-73f2-0310-859d-f6bbb57e9c96

* support for setting volume label (bug #7100).
* minor cleanup


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@40243 a95241bf-73f2-0310-859d-f6bbb57e9c96

* manages blockgroups unused_inodes when the feature is available.
* BitmapBlock::FindMarked/FindUnmarked() tried to find a free bit
at the end of a full bitmap. This fixes #7069.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@40143 a95241bf-73f2-0310-859d-f6bbb57e9c96

* added flex group, dirnlink and gdtchecksum features for ext4.
* I reused crc_table.cpp from the UDF filesystem and switched it to have the reversed algorithm,
then generated the table in CRCTable.cpp
* added a binary search for extent tree leaves.
* fixed a check in InodeAllocator::New().


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@40129 a95241bf-73f2-0310-859d-f6bbb57e9c96

* added fsblock_t and fileblock_t definitions, used them when needed.
* validate fBlockShift in superblock.
* Volume::AllocateBlocks() now uses an absolute fsblock instead of a blockgroup related fsblock.
* AllocationBlockGroup now provides absolute fsblock values.
* added support for extents feature: ExtentStream class is the equivalent for DataStream class for extent operations.
The extent tree implementation is very basic, should work for normal growing/shrinking
operations, but not for sparse files. When enlarging a file and extent tree is full,
the root is moved in a new block and a new level is added on top. Extents can usually
be extended when adjacent blocks are allocated. Shrinking happens by removing leafs
one after another.
* removed empty IndexedDirectoryIterator.*


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@39886 a95241bf-73f2-0310-859d-f6bbb57e9c96

Stop the journal on Sync(), start the journal when a transaction is written. This helps with fs state on shutdown.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@39325 a95241bf-73f2-0310-859d-f6bbb57e9c96

Volume: don't use a block allocator when mounting readonly.
BitmapBlock: also use file system blocks, current type is off_t. Also added more trace.
BlockAllocator: added an assert and more trace


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@39302 a95241bf-73f2-0310-859d-f6bbb57e9c96

fixed warnings, added a better label for >1TB sized volumes


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@39253 a95241bf-73f2-0310-859d-f6bbb57e9c96

* switched more uint32 to off_t for 64bit support
* added error messages in InodeAllocator, Inode
* if BlockAllocator can't initialize, don't fail completely but switch to readonly
* fixed a bug in FindNextMarked() for bitmaps with a length non multiple of 32
* Inode::FindBlock() now returns an optional block_run length, useful for get_file_map()
* added flag for Inode for extents


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@39234 a95241bf-73f2-0310-859d-f6bbb57e9c96

* added some support for 64bit feature: extended struct ext2_block_group, block number types changed from uint32 to off_t
* added error traces, asserts
* BitmapBlock::CheckUnmarked() and CheckMarked() computed a wrong remainingBits and mask


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@39203 a95241bf-73f2-0310-859d-f6bbb57e9c96

added some definitions for readonly features
we already support the extra isize feature, so it's now added
removed unused Inode::AttributeBlockReadAt()
group_descriptor_size was previously a reserved field in the super block


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@39125 a95241bf-73f2-0310-859d-f6bbb57e9c96

added large files feature support


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@39120 a95241bf-73f2-0310-859d-f6bbb57e9c96

added some logs in case of errors.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@38992 a95241bf-73f2-0310-859d-f6bbb57e9c96

* added support for huge_file feature, untested (need a >2TB file)
* actually checks for readonly features if mounting read-write
* don't use a journal when mounting readonly
* DataStream::_BlocksNeeded(): in case of double or triple indirects,
compute the additional blocks needed using the difference between the
old and new indirects blocks. This was resulting in a bad NumBlocks on an inode
* BitmapBlock: mark methods missed an iteration when the startingBit was zero.
Some blocks were then allocated two times (at most 32 for each allocation run).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@38950 a95241bf-73f2-0310-859d-f6bbb57e9c96

Patch from Janito Ferreira Filho (aka jjvf): this is the result of his GSoC assignment "Implement ext2/3 Read and Write Support for Haiku".
* Tested and checked most features and fs operations, while passing successfully the Linux fsck. Though the implementation still needs more testing and is to be used with
caution, it's better in my mind to have the code committed now given the size of the patch.
* Code style isn't extensively checked but is mostly OK. Code review is welcome.
Some notes from Janito:
* Sparse files aren't supported and hard links aren't supported. Write attributes methods aren't activated nor tested.
* Journaling needs more testing to make sure it behaves in a compatible way to Ext3, and support for the different modes hasn't been implemented (due to the block
and file cache incompatibility). Correct revoke management is also lacking, as is proper management of the superblock state and copies and block group copies.
* The code is partly based and inspired by the BFS implementation. Author information might need to be fixed.

I'd like to congratulate and thank Janito for his hard work to bring the implementation to the current state. I hope he'll keep on maintaining it and become a regular
contributor/committer.



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@38573 a95241bf-73f2-0310-859d-f6bbb57e9c96

Patch from Janito Ferreira Filho (bug #5706): limit the Inode ID to the maximum number of Inodes. Thanks!


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@36358 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Volume::Unmount() never put the root node, and never deleted the volume's
block cache.
* Some cleanup.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@35069 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Of course I messed it up; now ext2 doesn't crash anymore when I mount
something it does support.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29511 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Added the new incompatible features of ext4.
* Now correctly only check for the incompatible features we do understand,
not for the ones we don't. Ie. we won't mount ext4 partitions anymore that
are using extents.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29510 a95241bf-73f2-0310-859d-f6bbb57e9c96

Remove the additional fs_vnode_ops arugment from get_vnode() again as it's not
needed at all when used as intended. Thanks Ingo for the explanation on how this
is intended to work. Adjusted the overlay fs accordingly and updated/reverted
the changes to the other filesystems.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29250 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Add an additional argument to get_vnode() that gets the fs_vnode_ops of the
node. That is needed for a layered filesystem to be able to construct a full
fs_vnode out of a volume/inode pair.
* Adapt places where get_vnode is used. Sadly this is a C API and we can't just
use a default NULL for that argument.
* Introduce a flag B_VNODE_WANTS_OVERLAY_SUB_NODE that can be returned in the
flags field of a fs get_vnode call. A filesystem can use this flag to indicate
that it doesn't support the full set of fs features (attributes, write support)
and it'd like to have unsupported calls emulated by an overlay sub node.
* Add a perliminary overlay filesystem that emulates file attributes using files
on a filesystem where attributes aren't supported. It does currently only
support reading attributes/attribute directories though. All other calls are
just passed through to the super filesystem.
* Adjust places where a HAS_FS_CALL() is taken as a guarantee that the operation
is supported. For the overlay filesystem we may later return a B_UNSUPPORTED,
so make sure that in that case proper fallback options are taken.
* Make the iso9660 filesystem request overlay sub nodes. This can be fine tuned
later to only trigger where there are features on a CD that need emulation
at all.

If you happened to know the attribute file format and location you could build
an iso with read-only attribute support now. Note that this won't be enough to
get a bootable iso-only image as the query and index support is yet missing.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29177 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Changed to use Volume::InodeSize() over sizeof(ext2_inode) as described
in ticket #2707. Thanks Adrian!


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@28536 a95241bf-73f2-0310-859d-f6bbb57e9c96

Add missing string.h that would otherwise soon break the build.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26453 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Now prints the disk size as part of the default name so that different
volumes are easier to differentiate.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26241 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Cast block before shifting, as suggested by Marcus; it shouldn't have any
actual consequences but looks more correct.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26217 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Fixed wrong group block offset computation: the
ext2_super_block::first_data_block must be used; the superblock offset
doesn't matter if the block size is greater than 2KB.
* Fixed block access beyond the 4GB limit - we need to cast the block to
a 64 bit type in ext2_get_file_map() before shifting it.
* Tested with various larger ext3 disks, and everything seems to work fine.
* Added some optional debug output.
* Minor cleanup.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26213 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Implemented a read-only ext2 file system.
* It's not yet complete, doesn't support some ext2 stuff (like files over 4 GB),
and might have some other bugs (I only tested it with a single 20 MB ext2
image).
* To have a read/write ext2 file system, it would probably make more sense to
port GNU sources (like ext2fs lib), and use that. But a small read-only ext2
file sytem doesn't hurt, I think, and I don't know if ext2fs lib would be
feasible for kernel use (porting the file system from Linux directly would
also be an alternative, but probably more work).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26187 a95241bf-73f2-0310-859d-f6bbb57e9c96