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2015-05-15ext4: fix an ext3 collapse range regression in xfstestsTheodore Ts'o
The xfstests test suite assumes that an attempt to collapse range on the range (0, 1) will return EOPNOTSUPP if the file system does not support collapse range. Commit 280227a75b56: "ext4: move check under lock scope to close a race" broke this, and this caused xfstests to fail when run when testing file systems that did not have the extents feature enabled. Reported-by: Eric Whitney <enwlinux@gmail.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2015-05-14ext4: check for zero length extent explicitlyEryu Guan
The following commit introduced a bug when checking for zero length extent 5946d08 ext4: check for overlapping extents in ext4_valid_extent_entries() Zero length extent could pass the check if lblock is zero. Adding the explicit check for zero length back. Signed-off-by: Eryu Guan <guaneryu@gmail.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Cc: stable@vger.kernel.org
2015-05-14ext4: fix NULL pointer dereference when journal restart failsLukas Czerner
Currently when journal restart fails, we'll have the h_transaction of the handle set to NULL to indicate that the handle has been effectively aborted. We handle this situation quietly in the jbd2_journal_stop() and just free the handle and exit because everything else has been done before we attempted (and failed) to restart the journal. Unfortunately there are a number of problems with that approach introduced with commit 41a5b913197c "jbd2: invalidate handle if jbd2_journal_restart() fails" First of all in ext4 jbd2_journal_stop() will be called through __ext4_journal_stop() where we would try to get a hold of the superblock by dereferencing h_transaction which in this case would lead to NULL pointer dereference and crash. In addition we're going to free the handle regardless of the refcount which is bad as well, because others up the call chain will still reference the handle so we might potentially reference already freed memory. Moreover it's expected that we'll get aborted handle as well as detached handle in some of the journalling function as the error propagates up the stack, so it's unnecessary to call WARN_ON every time we get detached handle. And finally we might leak some memory by forgetting to free reserved handle in jbd2_journal_stop() in the case where handle was detached from the transaction (h_transaction is NULL). Fix the NULL pointer dereference in __ext4_journal_stop() by just calling jbd2_journal_stop() quietly as suggested by Jan Kara. Also fix the potential memory leak in jbd2_journal_stop() and use proper handle refcounting before we attempt to free it to avoid use-after-free issues. And finally remove all WARN_ON(!transaction) from the code so that we do not get random traces when something goes wrong because when journal restart fails we will get to some of those functions. Cc: stable@vger.kernel.org Signed-off-by: Lukas Czerner <lczerner@redhat.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Reviewed-by: Jan Kara <jack@suse.cz>
2015-05-14ext4: remove unused function prototype from ext4.hTheodore Ts'o
The ext4_extent_tree_init() function hasn't been in the ext4 code for a long time ago, except in an unused function prototype in ext4.h Google-Bug-Id: 4530137 Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2015-05-14ext4: don't save the error information if the block device is read-onlyTheodore Ts'o
Google-Bug-Id: 20939131 Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2015-05-14ext4: fix lazytime optimizationTheodore Ts'o
We had a fencepost error in the lazytime optimization which means that timestamp would get written to the wrong inode. Cc: stable@vger.kernel.org Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2015-05-03Merge tag 'for_linus_stable' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 Pull ext4 fixes from Ted Ts'o: "Some miscellaneous bug fixes and some final on-disk and ABI changes for ext4 encryption which provide better security and performance" * tag 'for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: ext4: fix growing of tiny filesystems ext4: move check under lock scope to close a race. ext4: fix data corruption caused by unwritten and delayed extents ext4 crypto: remove duplicated encryption mode definitions ext4 crypto: do not select from EXT4_FS_ENCRYPTION ext4 crypto: add padding to filenames before encrypting ext4 crypto: simplify and speed up filename encryption
2015-05-02ext4: fix growing of tiny filesystemsJan Kara
The estimate of necessary transaction credits in ext4_flex_group_add() is too pessimistic. It reserves credit for sb, resize inode, and resize inode dindirect block for each group added in a flex group although they are always the same block and thus it is enough to account them only once. Also the number of modified GDT block is overestimated since we fit EXT4_DESC_PER_BLOCK(sb) descriptors in one block. Make the estimation more precise. That reduces number of requested credits enough that we can grow 20 MB filesystem (which has 1 MB journal, 79 reserved GDT blocks, and flex group size 16 by default). Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Reviewed-by: Eric Sandeen <sandeen@redhat.com>
2015-05-02ext4: move check under lock scope to close a race.Davide Italiano
fallocate() checks that the file is extent-based and returns EOPNOTSUPP in case is not. Other tasks can convert from and to indirect and extent so it's safe to check only after grabbing the inode mutex. Signed-off-by: Davide Italiano <dccitaliano@gmail.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Cc: stable@vger.kernel.org
2015-05-02ext4: fix data corruption caused by unwritten and delayed extentsLukas Czerner
Currently it is possible to lose whole file system block worth of data when we hit the specific interaction with unwritten and delayed extents in status extent tree. The problem is that when we insert delayed extent into extent status tree the only way to get rid of it is when we write out delayed buffer. However there is a limitation in the extent status tree implementation so that when inserting unwritten extent should there be even a single delayed block the whole unwritten extent would be marked as delayed. At this point, there is no way to get rid of the delayed extents, because there are no delayed buffers to write out. So when a we write into said unwritten extent we will convert it to written, but it still remains delayed. When we try to write into that block later ext4_da_map_blocks() will set the buffer new and delayed and map it to invalid block which causes the rest of the block to be zeroed loosing already written data. For now we can fix this by simply not allowing to set delayed status on written extent in the extent status tree. Also add WARN_ON() to make sure that we notice if this happens in the future. This problem can be easily reproduced by running the following xfs_io. xfs_io -f -c "pwrite -S 0xaa 4096 2048" \ -c "falloc 0 131072" \ -c "pwrite -S 0xbb 65536 2048" \ -c "fsync" /mnt/test/fff echo 3 > /proc/sys/vm/drop_caches xfs_io -c "pwrite -S 0xdd 67584 2048" /mnt/test/fff This can be theoretically also reproduced by at random by running fsx, but it's not very reliable, though on machines with bigger page size (like ppc) this can be seen more often (especially xfstest generic/127) Signed-off-by: Lukas Czerner <lczerner@redhat.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Cc: stable@vger.kernel.org
2015-05-02ext4 crypto: remove duplicated encryption mode definitionsChanho Park
This patch removes duplicated encryption modes which were already in ext4.h. They were duplicated from commit 3edc18d and commit f542fb. Cc: Theodore Ts'o <tytso@mit.edu> Cc: Michael Halcrow <mhalcrow@google.com> Cc: Andreas Dilger <adilger.kernel@dilger.ca> Signed-off-by: Chanho Park <chanho61.park@samsung.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2015-05-02ext4 crypto: do not select from EXT4_FS_ENCRYPTIONHerbert Xu
This patch adds a tristate EXT4_ENCRYPTION to do the selections for EXT4_FS_ENCRYPTION because selecting from a bool causes all the selected options to be built-in, even if EXT4 itself is a module. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2015-05-01ext4 crypto: add padding to filenames before encryptingTheodore Ts'o
This obscures the length of the filenames, to decrease the amount of information leakage. By default, we pad the filenames to the next 4 byte boundaries. This costs nothing, since the directory entries are aligned to 4 byte boundaries anyway. Filenames can also be padded to 8, 16, or 32 bytes, which will consume more directory space. Change-Id: Ibb7a0fb76d2c48e2061240a709358ff40b14f322 Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2015-05-01ext4 crypto: simplify and speed up filename encryptionTheodore Ts'o
Avoid using SHA-1 when calculating the user-visible filename when the encryption key is available, and avoid decrypting lots of filenames when searching for a directory entry in a directory block. Change-Id: If4655f144784978ba0305b597bfa1c8d7bb69e63 Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2015-04-26Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull fourth vfs update from Al Viro: "d_inode() annotations from David Howells (sat in for-next since before the beginning of merge window) + four assorted fixes" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: RCU pathwalk breakage when running into a symlink overmounting something fix I_DIO_WAKEUP definition direct-io: only inc/dec inode->i_dio_count for file systems fs/9p: fix readdir() VFS: assorted d_backing_inode() annotations VFS: fs/inode.c helpers: d_inode() annotations VFS: fs/cachefiles: d_backing_inode() annotations VFS: fs library helpers: d_inode() annotations VFS: assorted weird filesystems: d_inode() annotations VFS: normal filesystems (and lustre): d_inode() annotations VFS: security/: d_inode() annotations VFS: security/: d_backing_inode() annotations VFS: net/: d_inode() annotations VFS: net/unix: d_backing_inode() annotations VFS: kernel/: d_inode() annotations VFS: audit: d_backing_inode() annotations VFS: Fix up some ->d_inode accesses in the chelsio driver VFS: Cachefiles should perform fs modifications on the top layer only VFS: AF_UNIX sockets should call mknod on the top layer only
2015-04-24direct-io: only inc/dec inode->i_dio_count for file systemsJens Axboe
do_blockdev_direct_IO() increments and decrements the inode ->i_dio_count for each IO operation. It does this to protect against truncate of a file. Block devices don't need this sort of protection. For a capable multiqueue setup, this atomic int is the only shared state between applications accessing the device for O_DIRECT, and it presents a scaling wall for that. In my testing, as much as 30% of system time is spent incrementing and decrementing this value. A mixed read/write workload improved from ~2.5M IOPS to ~9.6M IOPS, with better latencies too. Before: clat percentiles (usec): | 1.00th=[ 33], 5.00th=[ 34], 10.00th=[ 34], 20.00th=[ 34], | 30.00th=[ 34], 40.00th=[ 34], 50.00th=[ 35], 60.00th=[ 35], | 70.00th=[ 35], 80.00th=[ 35], 90.00th=[ 37], 95.00th=[ 80], | 99.00th=[ 98], 99.50th=[ 151], 99.90th=[ 155], 99.95th=[ 155], | 99.99th=[ 165] After: clat percentiles (usec): | 1.00th=[ 95], 5.00th=[ 108], 10.00th=[ 129], 20.00th=[ 149], | 30.00th=[ 155], 40.00th=[ 161], 50.00th=[ 167], 60.00th=[ 171], | 70.00th=[ 177], 80.00th=[ 185], 90.00th=[ 201], 95.00th=[ 270], | 99.00th=[ 390], 99.50th=[ 398], 99.90th=[ 418], 99.95th=[ 422], | 99.99th=[ 438] In other setups, Robert Elliott reported seeing good performance improvements: https://lkml.org/lkml/2015/4/3/557 The more applications accessing the device, the worse it gets. Add a new direct-io flags, DIO_SKIP_DIO_COUNT, which tells do_blockdev_direct_IO() that it need not worry about incrementing or decrementing the inode i_dio_count for this caller. Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Christoph Hellwig <hch@lst.de> Cc: Theodore Ts'o <tytso@mit.edu> Cc: Elliott, Robert (Server Storage) <elliott@hp.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Jens Axboe <axboe@fb.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-19Merge tag 'ext4_for_linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 Pull ext4 updates from Ted Ts'o: "A few bug fixes and add support for file-system level encryption in ext4" * tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: (31 commits) ext4 crypto: enable encryption feature flag ext4 crypto: add symlink encryption ext4 crypto: enable filename encryption ext4 crypto: filename encryption modifications ext4 crypto: partial update to namei.c for fname crypto ext4 crypto: insert encrypted filenames into a leaf directory block ext4 crypto: teach ext4_htree_store_dirent() to store decrypted filenames ext4 crypto: filename encryption facilities ext4 crypto: implement the ext4 decryption read path ext4 crypto: implement the ext4 encryption write path ext4 crypto: inherit encryption policies on inode and directory create ext4 crypto: enforce context consistency ext4 crypto: add encryption key management facilities ext4 crypto: add ext4 encryption facilities ext4 crypto: add encryption policy and password salt support ext4 crypto: add encryption xattr support ext4 crypto: export ext4_empty_dir() ext4 crypto: add ext4 encryption Kconfig ext4 crypto: reserve codepoints used by the ext4 encryption feature ext4 crypto: add ext4_mpage_readpages() ...
2015-04-16Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull third hunk of vfs changes from Al Viro: "This contains the ->direct_IO() changes from Omar + saner generic_write_checks() + dealing with fcntl()/{read,write}() races (mirroring O_APPEND/O_DIRECT into iocb->ki_flags and instead of repeatedly looking at ->f_flags, which can be changed by fcntl(2), check ->ki_flags - which cannot) + infrastructure bits for dhowells' d_inode annotations + Christophs switch of /dev/loop to vfs_iter_write()" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (30 commits) block: loop: switch to VFS ITER_BVEC configfs: Fix inconsistent use of file_inode() vs file->f_path.dentry->d_inode VFS: Make pathwalk use d_is_reg() rather than S_ISREG() VFS: Fix up debugfs to use d_is_dir() in place of S_ISDIR() VFS: Combine inode checks with d_is_negative() and d_is_positive() in pathwalk NFS: Don't use d_inode as a variable name VFS: Impose ordering on accesses of d_inode and d_flags VFS: Add owner-filesystem positive/negative dentry checks nfs: generic_write_checks() shouldn't be done on swapout... ocfs2: use __generic_file_write_iter() mirror O_APPEND and O_DIRECT into iocb->ki_flags switch generic_write_checks() to iocb and iter ocfs2: move generic_write_checks() before the alignment checks ocfs2_file_write_iter: stop messing with ppos udf_file_write_iter: reorder and simplify fuse: ->direct_IO() doesn't need generic_write_checks() ext4_file_write_iter: move generic_write_checks() up xfs_file_aio_write_checks: switch to iocb/iov_iter generic_write_checks(): drop isblk argument blkdev_write_iter: expand generic_file_checks() call in there ...
2015-04-16Merge branch 'for_linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs Pull quota and udf updates from Jan Kara: "The pull contains quota changes which complete unification of XFS and VFS quota interfaces (so tools can use either interface to manipulate any filesystem). There's also a patch to support project quotas in VFS quota subsystem from Li Xi. Finally there's a bunch of UDF fixes and cleanups and tiny cleanup in reiserfs & ext3" * 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs: (21 commits) udf: Update ctime and mtime when directory is modified udf: return correct errno for udf_update_inode() ext3: Remove useless condition in if statement. vfs: Add general support to enforce project quota limits reiserfs: fix __RASSERT format string udf: use int for allocated blocks instead of sector_t udf: remove redundant buffer_head.h includes udf: remove else after return in __load_block_bitmap() udf: remove unused variable in udf_table_free_blocks() quota: Fix maximum quota limit settings quota: reorder flags in quota state quota: paranoia: check quota tree root quota: optimize i_dquot access quota: Hook up Q_XSETQLIM for id 0 to ->set_info xfs: Add support for Q_SETINFO quota: Make ->set_info use structure with neccesary info to VFS and XFS quota: Remove ->get_xstate and ->get_xstatev callbacks gfs2: Convert to using ->get_state callback xfs: Convert to using ->get_state callback quota: Wire up Q_GETXSTATE and Q_GETXSTATV calls to work with ->get_state ...
2015-04-16ext4 crypto: enable encryption feature flagTheodore Ts'o
Also add the test dummy encryption mode flag so we can more easily test the encryption patches using xfstests. Signed-off-by: Michael Halcrow <mhalcrow@google.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2015-04-16ext4 crypto: add symlink encryptionTheodore Ts'o
Signed-off-by: Uday Savagaonkar <savagaon@google.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2015-04-15Merge branch 'akpm' (patches from Andrew)Linus Torvalds
Merge second patchbomb from Andrew Morton: - the rest of MM - various misc bits - add ability to run /sbin/reboot at reboot time - printk/vsprintf changes - fiddle with seq_printf() return value * akpm: (114 commits) parisc: remove use of seq_printf return value lru_cache: remove use of seq_printf return value tracing: remove use of seq_printf return value cgroup: remove use of seq_printf return value proc: remove use of seq_printf return value s390: remove use of seq_printf return value cris fasttimer: remove use of seq_printf return value cris: remove use of seq_printf return value openrisc: remove use of seq_printf return value ARM: plat-pxa: remove use of seq_printf return value nios2: cpuinfo: remove use of seq_printf return value microblaze: mb: remove use of seq_printf return value ipc: remove use of seq_printf return value rtc: remove use of seq_printf return value power: wakeup: remove use of seq_printf return value x86: mtrr: if: remove use of seq_printf return value linux/bitmap.h: improve BITMAP_{LAST,FIRST}_WORD_MASK MAINTAINERS: CREDITS: remove Stefano Brivio from B43 .mailmap: add Ricardo Ribalda CREDITS: add Ricardo Ribalda Delgado ...
2015-04-15dax: unify ext2/4_{dax,}_file_operationsBoaz Harrosh
The original dax patchset split the ext2/4_file_operations because of the two NULL splice_read/splice_write in the dax case. In the vfs if splice_read/splice_write are NULL we then call default_splice_read/write. What we do here is make generic_file_splice_read aware of IS_DAX() so the original ext2/4_file_operations can be used as is. For write it appears that iter_file_splice_write is just fine. It uses the regular f_op->write(file,..) or new_sync_write(file, ...). Signed-off-by: Boaz Harrosh <boaz@plexistor.com> Reviewed-by: Jan Kara <jack@suse.cz> Cc: Dave Chinner <dchinner@redhat.com> Cc: Matthew Wilcox <willy@linux.intel.com> Cc: Hugh Dickins <hughd@google.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-04-15dax: use pfn_mkwrite to update c/mtime + freeze protectionBoaz Harrosh
From: Yigal Korman <yigal@plexistor.com> [v1] Without this patch, c/mtime is not updated correctly when mmap'ed page is first read from and then written to. A new xfstest is submitted for testing this (generic/080) [v2] Jan Kara has pointed out that if we add the sb_start/end_pagefault pair in the new pfn_mkwrite we are then fixing another bug where: A user could start writing to the page while filesystem is frozen. Signed-off-by: Yigal Korman <yigal@plexistor.com> Signed-off-by: Boaz Harrosh <boaz@plexistor.com> Reviewed-by: Jan Kara <jack@suse.cz> Cc: Matthew Wilcox <matthew.r.wilcox@intel.com> Cc: Dave Chinner <david@fromorbit.com> Cc: Hugh Dickins <hughd@google.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-04-15VFS: normal filesystems (and lustre): d_inode() annotationsDavid Howells
that's the bulk of filesystem drivers dealing with inodes of their own Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-12ext4 crypto: enable filename encryptionMichael Halcrow
Signed-off-by: Uday Savagaonkar <savagaon@google.com> Signed-off-by: Ildar Muslukhov <ildarm@google.com> Signed-off-by: Michael Halcrow <mhalcrow@google.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2015-04-12ext4 crypto: filename encryption modificationsMichael Halcrow
Modifies htree_dirblock_to_tree, dx_make_map, ext4_match search_dir, and ext4_find_dest_de to support fname crypto. Filename encryption feature is not yet enabled at this patch. Signed-off-by: Uday Savagaonkar <savagaon@google.com> Signed-off-by: Ildar Muslukhov <ildarm@google.com> Signed-off-by: Michael Halcrow <mhalcrow@google.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2015-04-12ext4 crypto: partial update to namei.c for fname cryptoMichael Halcrow
Modifies dx_show_leaf and dx_probe to support fname encryption. Filename encryption not yet enabled. Signed-off-by: Uday Savagaonkar <savagaon@google.com> Signed-off-by: Ildar Muslukhov <ildarm@google.com> Signed-off-by: Michael Halcrow <mhalcrow@google.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2015-04-12ext4 crypto: insert encrypted filenames into a leaf directory blockMichael Halcrow
Signed-off-by: Uday Savagaonkar <savagaon@google.com> Signed-off-by: Ildar Muslukhov <ildarm@google.com> Signed-off-by: Michael Halcrow <mhalcrow@google.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2015-04-12ext4 crypto: teach ext4_htree_store_dirent() to store decrypted filenamesTheodore Ts'o
For encrypted directories, we need to pass in a separate parameter for the decrypted filename, since the directory entry contains the encrypted filename. Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2015-04-12ext4 crypto: filename encryption facilitiesMichael Halcrow
Signed-off-by: Uday Savagaonkar <savagaon@google.com> Signed-off-by: Ildar Muslukhov <ildarm@google.com> Signed-off-by: Michael Halcrow <mhalcrow@google.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2015-04-12ext4 crypto: implement the ext4 decryption read pathMichael Halcrow
Signed-off-by: Michael Halcrow <mhalcrow@google.com> Signed-off-by: Ildar Muslukhov <ildarm@google.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2015-04-12ext4 crypto: implement the ext4 encryption write pathMichael Halcrow
Pulls block_write_begin() into fs/ext4/inode.c because it might need to do a low-level read of the existing data, in which case we need to decrypt it. Signed-off-by: Michael Halcrow <mhalcrow@google.com> Signed-off-by: Ildar Muslukhov <ildarm@google.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2015-04-12ext4 crypto: inherit encryption policies on inode and directory createMichael Halcrow
Signed-off-by: Michael Halcrow <mhalcrow@google.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2015-04-12ext4 crypto: enforce context consistencyTheodore Ts'o
Enforce the following inheritance policy: 1) An unencrypted directory may contain encrypted or unencrypted files or directories. 2) All files or directories in a directory must be protected using the same key as their containing directory. As a result, assuming the following setup: mke2fs -t ext4 -Fq -O encrypt /dev/vdc mount -t ext4 /dev/vdc /vdc mkdir /vdc/a /vdc/b /vdc/c echo foo | e4crypt add_key /vdc/a echo bar | e4crypt add_key /vdc/b for i in a b c ; do cp /etc/motd /vdc/$i/motd-$i ; done Then we will see the following results: cd /vdc mv a b # will fail; /vdc/a and /vdc/b have different keys mv b/motd-b a # will fail, see above ln a/motd-a b # will fail, see above mv c a # will fail; all inodes in an encrypted directory # must be encrypted ln c/motd-c b # will fail, see above mv a/motd-a c # will succeed mv c/motd-a a # will succeed Signed-off-by: Michael Halcrow <mhalcrow@google.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2015-04-12ext4 crypto: add encryption key management facilitiesMichael Halcrow
Signed-off-by: Michael Halcrow <mhalcrow@google.com> Signed-off-by: Ildar Muslukhov <muslukhovi@gmail.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2015-04-12ext4 crypto: add ext4 encryption facilitiesMichael Halcrow
On encrypt, we will re-assign the buffer_heads to point to a bounce page rather than the control_page (which is the original page to write that contains the plaintext). The block I/O occurs against the bounce page. On write completion, we re-assign the buffer_heads to the original plaintext page. On decrypt, we will attach a read completion callback to the bio struct. This read completion will decrypt the read contents in-place prior to setting the page up-to-date. The current encryption mode, AES-256-XTS, lacks cryptographic integrity. AES-256-GCM is in-plan, but we will need to devise a mechanism for handling the integrity data. Signed-off-by: Michael Halcrow <mhalcrow@google.com> Signed-off-by: Ildar Muslukhov <ildarm@google.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2015-04-11mirror O_APPEND and O_DIRECT into iocb->ki_flagsAl Viro
... avoiding write_iter/fcntl races. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-11switch generic_write_checks() to iocb and iterAl Viro
... returning -E... upon error and amount of data left in iter after (possible) truncation upon success. Note, that normal case gives a non-zero (positive) return value, so any tests for != 0 _must_ be updated. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Conflicts: fs/ext4/file.c
2015-04-11ext4_file_write_iter: move generic_write_checks() upAl Viro
simpler that way... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-11generic_write_checks(): drop isblk argumentAl Viro
all remaining callers are passing 0; some just obscure that fact. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-11lift generic_write_checks() into callers of __generic_file_write_iter()Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-11direct_IO: remove rw from a_ops->direct_IO()Omar Sandoval
Now that no one is using rw, remove it completely. Signed-off-by: Omar Sandoval <osandov@osandov.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-11direct_IO: use iov_iter_rw() instead of rw everywhereOmar Sandoval
The rw parameter to direct_IO is redundant with iov_iter->type, and treated slightly differently just about everywhere it's used: some users do rw & WRITE, and others do rw == WRITE where they should be doing a bitwise check. Simplify this with the new iov_iter_rw() helper, which always returns either READ or WRITE. Signed-off-by: Omar Sandoval <osandov@osandov.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-11Remove rw from dax_{do_,}io()Omar Sandoval
And use iov_iter_rw() instead. Signed-off-by: Omar Sandoval <osandov@osandov.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-11Remove rw from {,__,do_}blockdev_direct_IO()Omar Sandoval
Most filesystems call through to these at some point, so we'll start here. Signed-off-by: Omar Sandoval <osandov@osandov.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-11make new_sync_{read,write}() staticAl Viro
All places outside of core VFS that checked ->read and ->write for being NULL or called the methods directly are gone now, so NULL {read,write} with non-NULL {read,write}_iter will do the right thing in all cases. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-11Merge branch 'iocb' into for-nextAl Viro
2015-04-11ext4 crypto: add encryption policy and password salt supportMichael Halcrow
Signed-off-by: Michael Halcrow <mhalcrow@google.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Ildar Muslukhov <muslukhovi@gmail.com>
2015-04-11ext4 crypto: add encryption xattr supportMichael Halcrow
Signed-off-by: Michael Halcrow <mhalcrow@google.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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