Commit Graph

492 Commits

Author SHA1 Message Date
Al Viro 8174202b34 write_iter variants of {__,}generic_file_aio_write()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-05-06 17:38:00 -04:00
Al Viro 027978295d ecryptfs: switch to ->read_iter()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-05-06 17:37:56 -04:00
Linus Torvalds 7df934526c Merge branch 'cross-rename' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs
Pull renameat2 system call from Miklos Szeredi:
 "This adds a new syscall, renameat2(), which is the same as renameat()
  but with a flags argument.

  The purpose of extending rename is to add cross-rename, a symmetric
  variant of rename, which exchanges the two files.  This allows
  interesting things, which were not possible before, for example
  atomically replacing a directory tree with a symlink, etc...  This
  also allows overlayfs and friends to operate on whiteouts atomically.

  Andy Lutomirski also suggested a "noreplace" flag, which disables the
  overwriting behavior of rename.

  These two flags, RENAME_EXCHANGE and RENAME_NOREPLACE are only
  implemented for ext4 as an example and for testing"

* 'cross-rename' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs:
  ext4: add cross rename support
  ext4: rename: split out helper functions
  ext4: rename: move EMLINK check up
  ext4: rename: create ext4_renament structure for local vars
  vfs: add cross-rename
  vfs: lock_two_nondirectories: allow directory args
  security: add flags to rename hooks
  vfs: add RENAME_NOREPLACE flag
  vfs: add renameat2 syscall
  vfs: rename: use common code for dir and non-dir
  vfs: rename: move d_move() up
  vfs: add d_is_dir()
2014-04-04 14:03:05 -07:00
Johannes Weiner 91b0abe36a mm + fs: store shadow entries in page cache
Reclaim will be leaving shadow entries in the page cache radix tree upon
evicting the real page.  As those pages are found from the LRU, an
iput() can lead to the inode being freed concurrently.  At this point,
reclaim must no longer install shadow pages because the inode freeing
code needs to ensure the page tree is really empty.

Add an address_space flag, AS_EXITING, that the inode freeing code sets
under the tree lock before doing the final truncate.  Reclaim will check
for this flag before installing shadow pages.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Rik van Riel <riel@redhat.com>
Reviewed-by: Minchan Kim <minchan@kernel.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Bob Liu <bob.liu@oracle.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jan Kara <jack@suse.cz>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Luigi Semenzato <semenzato@google.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Metin Doslu <metin@citusdata.com>
Cc: Michel Lespinasse <walken@google.com>
Cc: Ozgun Erdogan <ozgun@citusdata.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Roman Gushchin <klamm@yandex-team.ru>
Cc: Ryan Mallon <rmallon@gmail.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-04-03 16:21:01 -07:00
Miklos Szeredi 520c8b1650 vfs: add renameat2 syscall
Add new renameat2 syscall, which is the same as renameat with an added
flags argument.

Pass flags to vfs_rename() and to i_op->rename() as well.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Reviewed-by: J. Bruce Fields <bfields@redhat.com>
2014-04-01 17:08:42 +02:00
Al Viro b22e8fedc1 ecryptfs: fix failure handling in ->readlink()
If ecryptfs_readlink_lower() fails, buf remains an uninitialized
pointer and passing it nd_set_link() won't do anything good.

Fixed by switching ecryptfs_readlink_lower() to saner API - make it
return buf or ERR_PTR(...) and update callers.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-01-25 03:13:00 -05:00
Linus Torvalds 57498f9cb9 Quiet static checkers by removing unneeded conditionals
-----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1.4.14 (GNU/Linux)
 
 iQIcBAABCgAGBQJSj6OkAAoJENaSAD2qAscK9ukP/Ar6Lracra9IViBvFRIgBGnf
 K0jUwF0atd9Uj+E7phUzG2cfTKHqCVHYHfP/tCSurjjQnb9TpQ1ZkFy22VGrlDYK
 jrU39wOfQQCQX+pPmJIX2L3W5ZAEFbBMgJZ7PaIM1qDV9cjy+mt/iNHJrH0BHBH4
 HryvCMeALRR5elwYkhfTql4VN2ClS9veAWdcGhAsbZ8vaNB01x+9Wps+t/VPiCVp
 +K3C+mC/LennTzdmDJUIbMFbKSsTjrdynRtuPLeSgVAA6Y05ps5vf+hoNmiLmphJ
 z1j0HCht1FApM8VrllRmJla8vo6DRoqn+DUqRRuoI7kE5zFS61x5EIpogGdqmhn/
 9zYA9xdj7Fpw/57G3xSpUdpS5u0JsxETc580iitl1tDgEHcQEgmRSCa89uhaaDFi
 pSKgV7au5DqJdBtTDvWeQPAKrkT9LWOsrlEXX5aqM8wIs8FheIPZMEz11m6vMp6n
 e9geohCvpLL0opUx209ofpYHpYLS6IXY/LrQeHSYeZ2DYGyDZ7R/KHt8GN1NwLrE
 AUJTOzdq3H37ZDlmkcTEO9z84qfgaHioiHGlzYcCfzR6aw6cey1jOj8Y9lg0gciQ
 nWuWXtES0UtvpR9w84nbXCpgOrQMYpGOhqvduDALa+7XhbDhpFtmN9e4f9CfTumv
 PYQ9hYRKD3w6iWsoYubd
 =IgXu
 -----END PGP SIGNATURE-----

Merge tag 'ecryptfs-3.13-rc1-quiet-checkers' of git://git.kernel.org/pub/scm/linux/kernel/git/tyhicks/ecryptfs

Pull minor eCryptfs fix from Tyler Hicks:
 "Quiet static checkers by removing unneeded conditionals"

* tag 'ecryptfs-3.13-rc1-quiet-checkers' of git://git.kernel.org/pub/scm/linux/kernel/git/tyhicks/ecryptfs:
  eCryptfs: file->private_data is always valid
2013-11-22 10:58:14 -08:00
Wolfram Sang 16735d022f tree-wide: use reinit_completion instead of INIT_COMPLETION
Use this new function to make code more comprehensible, since we are
reinitialzing the completion, not initializing.

[akpm@linux-foundation.org: linux-next resyncs]
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Acked-by: Linus Walleij <linus.walleij@linaro.org> (personally at LCE13)
Cc: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-15 09:32:21 +09:00
Tyler Hicks 2000f5beab eCryptfs: file->private_data is always valid
When accessing the lower_file pointer located in private_data of
eCryptfs files, there is no need to check to see if the private_data
pointer has been initialized to a non-NULL value. The file->private_data
and file->private_data->lower_file pointers are always initialized to
non-NULL values in ecryptfs_open().

This change quiets a Smatch warning:

  CHECK   /var/scm/kernel/linux/fs/ecryptfs/file.c
fs/ecryptfs/file.c:321 ecryptfs_unlocked_ioctl() error: potential NULL dereference 'lower_file'.
fs/ecryptfs/file.c:335 ecryptfs_compat_ioctl() error: potential NULL dereference 'lower_file'.

Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Geyslan G. Bem <geyslan@gmail.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
2013-11-14 12:12:15 -08:00
Linus Torvalds 9bc9ccd7db Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull vfs updates from Al Viro:
 "All kinds of stuff this time around; some more notable parts:

   - RCU'd vfsmounts handling
   - new primitives for coredump handling
   - files_lock is gone
   - Bruce's delegations handling series
   - exportfs fixes

  plus misc stuff all over the place"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (101 commits)
  ecryptfs: ->f_op is never NULL
  locks: break delegations on any attribute modification
  locks: break delegations on link
  locks: break delegations on rename
  locks: helper functions for delegation breaking
  locks: break delegations on unlink
  namei: minor vfs_unlink cleanup
  locks: implement delegations
  locks: introduce new FL_DELEG lock flag
  vfs: take i_mutex on renamed file
  vfs: rename I_MUTEX_QUOTA now that it's not used for quotas
  vfs: don't use PARENT/CHILD lock classes for non-directories
  vfs: pull ext4's double-i_mutex-locking into common code
  exportfs: fix quadratic behavior in filehandle lookup
  exportfs: better variable name
  exportfs: move most of reconnect_path to helper function
  exportfs: eliminate unused "noprogress" counter
  exportfs: stop retrying once we race with rename/remove
  exportfs: clear DISCONNECTED on all parents sooner
  exportfs: more detailed comment for path_reconnect
  ...
2013-11-13 15:34:18 +09:00
Al Viro bdd3536618 ecryptfs: ->f_op is never NULL
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-11-09 22:19:48 -05:00
J. Bruce Fields 27ac0ffeac locks: break delegations on any attribute modification
NFSv4 uses leases to guarantee that clients can cache metadata as well
as data.

Cc: Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz>
Cc: David Howells <dhowells@redhat.com>
Cc: Tyler Hicks <tyhicks@canonical.com>
Cc: Dustin Kirkland <dustin.kirkland@gazzang.com>
Acked-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-11-09 00:16:44 -05:00
J. Bruce Fields 146a8595c6 locks: break delegations on link
Cc: Tyler Hicks <tyhicks@canonical.com>
Cc: Dustin Kirkland <dustin.kirkland@gazzang.com>
Acked-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-11-09 00:16:43 -05:00
J. Bruce Fields 8e6d782cab locks: break delegations on rename
Cc: David Howells <dhowells@redhat.com>
Acked-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-11-09 00:16:43 -05:00
J. Bruce Fields b21996e36c locks: break delegations on unlink
We need to break delegations on any operation that changes the set of
links pointing to an inode.  Start with unlink.

Such operations also hold the i_mutex on a parent directory.  Breaking a
delegation may require waiting for a timeout (by default 90 seconds) in
the case of a unresponsive NFS client.  To avoid blocking all directory
operations, we therefore drop locks before waiting for the delegation.
The logic then looks like:

	acquire locks
	...
	test for delegation; if found:
		take reference on inode
		release locks
		wait for delegation break
		drop reference on inode
		retry

It is possible this could never terminate.  (Even if we take precautions
to prevent another delegation being acquired on the same inode, we could
get a different inode on each retry.)  But this seems very unlikely.

The initial test for a delegation happens after the lock on the target
inode is acquired, but the directory inode may have been acquired
further up the call stack.  We therefore add a "struct inode **"
argument to any intervening functions, which we use to pass the inode
back up to the caller in the case it needs a delegation synchronously
broken.

Cc: David Howells <dhowells@redhat.com>
Cc: Tyler Hicks <tyhicks@canonical.com>
Cc: Dustin Kirkland <dustin.kirkland@gazzang.com>
Acked-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-11-09 00:16:42 -05:00
Al Viro 72c2d53192 file->f_op is never NULL...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24 23:34:54 -04:00
Al Viro 87dc800be2 new helper: kfree_put_link()
duplicated to hell and back...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24 23:34:49 -04:00
Al Viro cbe9c08524 ecryptfs: ->lower_path.dentry is never NULL
... on anything found via ->d_fsdata

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24 23:34:48 -04:00
Al Viro 92dd123033 ecryptfs: get rid of ecryptfs_set_dentry_lower{,_mnt}
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24 23:34:48 -04:00
Al Viro 2edbfbf1c1 ecryptfs: don't leave RCU pathwalk immediately
If the underlying dentry doesn't have ->d_revalidate(), there's no need to
force dropping out of RCU mode.  All we need for that is to make freeing
ecryptfs_dentry_info RCU-delayed.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24 23:34:48 -04:00
Al Viro 3a93e17cf6 ecryptfs: check DCACHE_OP_REVALIDATE instead of ->d_op
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-10-24 23:34:47 -04:00
Colin Ian King 43b7c6c6a4 eCryptfs: fix 32 bit corruption issue
Shifting page->index on 32 bit systems was overflowing, causing
data corruption of > 4GB files. Fix this by casting it first.

https://launchpad.net/bugs/1243636

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reported-by: Lars Duesing <lars.duesing@camelotsweb.de>
Cc: stable@vger.kernel.org # v3.11+
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
2013-10-24 12:36:30 -07:00
Geyslan G. Bem 3edc8376c0 ecryptfs: Fix memory leakage in keystore.c
In 'decrypt_pki_encrypted_session_key' function:

Initializes 'payload' pointer and releases it on exit.

Signed-off-by: Geyslan G. Bem <geyslan@gmail.com>
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Cc: stable@vger.kernel.org # v2.6.28+
2013-10-16 15:18:01 -07:00
Kees Cook cb69f36ba1 ecryptfs: avoid ctx initialization race
It might be possible for two callers to race the mutex lock after the
NULL ctx check. Instead, move the lock above the check so there isn't
the possibility of leaking a crypto ctx. Additionally, report the full
algo name when failing.

Signed-off-by: Kees Cook <keescook@chromium.org>
[tyhicks: remove out label, which is no longer used]
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
2013-09-06 16:58:18 -07:00
Dan Carpenter e6cbd6a44d ecryptfs: remove check for if an array is NULL
It doesn't make sense to check if an array is NULL.  The compiler just
removes the check.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
2013-09-06 16:51:56 -07:00
Linus Torvalds 746919d266 Code cleanups and improved buffer handling during page crypto operations
- Remove redundant code by merging some encrypt and decrypt functions
 - Get rid of a helper page allocation during page decryption by using in-place
   decryption
 - Better use of entire pages during page crypto operations
 - Several code cleanups
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1.4.12 (GNU/Linux)
 
 iQIbBAABCgAGBQJR3Z1JAAoJENaSAD2qAscK+jAP92NR3W17njuPFJBHCROsS481
 tyhzy2W/LlNK1njnS6SRP3O3Icv3adiJRtMZePV7bpCH3yD/JoYZ6VHQBNV7msHW
 VuEwE6eqCkKl3NLunhwd4+m5R9qijJYGfYEzTve/RNASDU7/LPcTUF8OQ5dIB0wA
 J6IMGGZSpsFa8ymN01YzmUEmOUx1IBR2aYBT8Og4Ke117ywDYqxS0ghd1rb953sS
 7H8wnNcijs1DLGe71SZnKMVCYwO32GWarxDBAa0KsabcyY4Yr43O3ov/CsIAAA7B
 Q1Dn7KNNSOCu9G6fHrnuMOTncGnNPLhIe6Yc0PCZ7ykVstpzlNkKJ628IEonsJaJ
 4bYc3bqq4KH7rqMxjA+1GoLehpJWJzqwfiFI1fWLlYMmO2ky126rJUgSNBHQe9+M
 iWl+ZrYokSsNWBcUsIq7SJFaLIhWDNcb+Wl7RiTNBBwoBaZclrNuWKIyeWPhH+9/
 +/K3LBaggujzVpE743wgJhY60sfdHZmaRAD9agEbcG773JePXBg9OkiUp/hKSe8s
 UaGkfmwAlz8u6mR1eJCuFDCqwJKByyT4vObuOFroh7NgOHaQZghlnO4HwuOjzp6U
 wTUiMVslFY9WAsEWxdDhaCXxB8IrjHz3YZGIt8PU2eT6ucQU+HLvkkxqtzSYm9/7
 BBfryWZKwR7T50JdehI=
 =mRpN
 -----END PGP SIGNATURE-----

Merge tag 'ecryptfs-3.11-rc1-cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git/tyhicks/ecryptfs

Pull eCryptfs updates from Tyler Hicks:
 "Code cleanups and improved buffer handling during page crypto
  operations:
   - Remove redundant code by merging some encrypt and decrypt functions
   - Get rid of a helper page allocation during page decryption by using
     in-place decryption
   - Better use of entire pages during page crypto operations
   - Several code cleanups"

* tag 'ecryptfs-3.11-rc1-cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git/tyhicks/ecryptfs:
  Use ecryptfs_dentry_to_lower_path in a couple of places
  eCryptfs: Make extent and scatterlist crypt function parameters similar
  eCryptfs: Collapse crypt_page_offset() into crypt_extent()
  eCryptfs: Merge ecryptfs_encrypt_extent() and ecryptfs_decrypt_extent()
  eCryptfs: Combine page_offset crypto functions
  eCryptfs: Combine encrypt_scatterlist() and decrypt_scatterlist()
  eCryptfs: Decrypt pages in-place
  eCryptfs: Accept one offset parameter in page offset crypto functions
  eCryptfs: Simplify lower file offset calculation
  eCryptfs: Read/write entire page during page IO
  eCryptfs: Use entire helper page during page crypto operations
  eCryptfs: Cocci spatch "memdup.spatch"
2013-07-11 10:20:18 -07:00
Matthew Wilcox cc18ec3c8f Use ecryptfs_dentry_to_lower_path in a couple of places
There are two places in ecryptfs that benefit from using
ecryptfs_dentry_to_lower_path() instead of separate calls to
ecryptfs_dentry_to_lower() and ecryptfs_dentry_to_lower_mnt().  Both
sites use fewer instructions and less stack (determined by examining
objdump output).

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
2013-07-09 23:40:28 -07:00
Al Viro 84d08fa888 helper for reading ->d_count
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-07-05 18:59:33 +04:00
Al Viro 0747fdb2bd ecryptfs: switch ecryptfs_decode_and_decrypt_filename() from dentry to sb
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-06-29 12:57:25 +04:00
Al Viro 2de5f059c4 [readdir] convert ecryptfs
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-06-29 12:57:04 +04:00
Al Viro 5c0ba4e076 [readdir] introduce iterate_dir() and dir_context
iterate_dir(): new helper, replacing vfs_readdir().

struct dir_context: contains the readdir callback (and will get more stuff
in it), embedded into whatever data that callback wants to deal with;
eventually, we'll be passing it to ->readdir() replacement instead of
(data,filldir) pair.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-06-29 12:46:46 +04:00
Tyler Hicks 0df5ed65c1 eCryptfs: Make extent and scatterlist crypt function parameters similar
The 'dest' abbreviation is only used in crypt_scatterlist(), while all
other functions in crypto.c use 'dst' so dest_sg should be renamed to
dst_sg.

The crypt_stat parameter is typically the first parameter in internal
eCryptfs functions so crypt_stat and dst_page should be swapped in
crypt_extent().

Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
2013-06-07 17:28:29 -07:00
Tyler Hicks 406c93df09 eCryptfs: Collapse crypt_page_offset() into crypt_extent()
crypt_page_offset() simply initialized the two scatterlists and called
crypt_scatterlist() so it is simple enough to move into the only
function that calls it.

Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
2013-06-07 17:28:28 -07:00
Tyler Hicks d78de61896 eCryptfs: Merge ecryptfs_encrypt_extent() and ecryptfs_decrypt_extent()
They are identical except if the src_page or dst_page index is used, so
they can be merged safely if page_index is conditionally assigned.

Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
2013-06-07 17:28:27 -07:00
Tyler Hicks a8ca90e207 eCryptfs: Combine page_offset crypto functions
Combine ecryptfs_encrypt_page_offset() and
ecryptfs_decrypt_page_offset(). These two functions are functionally
identical so they can be safely merged if the caller can indicate
whether an encryption or decryption operation should occur.

Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
2013-06-07 17:28:27 -07:00
Tyler Hicks 00a699400a eCryptfs: Combine encrypt_scatterlist() and decrypt_scatterlist()
These two functions are identical except for a debug printk and whether
they call crypto_ablkcipher_encrypt() or crypto_ablkcipher_decrypt(), so
they can be safely merged if the caller can indicate if encryption or
decryption should occur.

The debug printk is useless so it is removed.

Two new #define's are created to indicate if an ENCRYPT or DECRYPT
operation is desired.

Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
2013-06-07 17:28:26 -07:00
Tyler Hicks 9c6043f412 eCryptfs: Decrypt pages in-place
When reading in a page, eCryptfs would allocate a helper page, fill it
with encrypted data from the lower filesytem, and then decrypt the data
from the encrypted page and store the result in the eCryptfs page cache
page.

The crypto API supports in-place crypto operations which means that the
allocation of the helper page is unnecessary when decrypting. This patch
gets rid of the unneeded page allocation by reading encrypted data from
the lower filesystem directly into the page cache page. The page cache
page is then decrypted in-place.

Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
2013-06-07 17:28:25 -07:00
Tyler Hicks 28916d1ac1 eCryptfs: Accept one offset parameter in page offset crypto functions
There is no longer a need to accept different offset values for the
source and destination pages when encrypting/decrypting an extent in an
eCryptfs page. The two offsets can be collapsed into a single parameter.

Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
2013-06-07 17:28:24 -07:00
Tyler Hicks 24d15266bd eCryptfs: Simplify lower file offset calculation
Now that lower filesystem IO operations occur for complete
PAGE_CACHE_SIZE bytes, the calculation for converting an eCryptfs extent
index into a lower file offset can be simplified.

Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
2013-06-07 17:28:23 -07:00
Tyler Hicks 0f89617623 eCryptfs: Read/write entire page during page IO
When reading and writing encrypted pages, perform IO using the entire
page all at once rather than 4096 bytes at a time.

This only affects architectures where PAGE_CACHE_SIZE is larger than
4096 bytes.

Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
2013-06-07 17:28:22 -07:00
Tyler Hicks 12003e5b18 eCryptfs: Use entire helper page during page crypto operations
When encrypting eCryptfs pages and decrypting pages from the lower
filesystem, utilize the entire helper page rather than only the first
4096 bytes.

This only affects architectures where PAGE_CACHE_SIZE is larger than
4096 bytes.

Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
2013-06-07 17:28:21 -07:00
Thomas Meyer fc8b14d338 eCryptfs: Cocci spatch "memdup.spatch"
Signed-off-by: Thomas Meyer <thomas@m3y3r.de>
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
2013-06-07 17:26:55 -07:00
Tyler Hicks bc5abcf7e4 eCryptfs: Check return of filemap_write_and_wait during fsync
Error out of ecryptfs_fsync() if filemap_write_and_wait() fails.

Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Cc: Paul Taysom <taysom@chromium.org>
Cc: Olof Johansson <olofj@chromium.org>
Cc: stable@vger.kernel.org # v3.6+
2013-06-04 23:53:31 -07:00
Paul Taysom c15cddd900 ecryptfs: fixed msync to flush data
When msync is called on a memory mapped file, that
data is not flushed to the disk.

In Linux, msync calls fsync for the file. For ecryptfs,
fsync just calls the lower level file system's fsync.
Changed the ecryptfs fsync code to call filemap_write_and_wait
before calling the lower level fsync.

Addresses the problem described in http://crbug.com/239536

Signed-off-by: Paul Taysom <taysom@chromium.org>
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Cc: stable@vger.kernel.org # v3.6+
2013-05-24 16:21:45 -07:00
Linus Torvalds 6fad8d02ef Improve performance when AES-NI (and most likely other crypto accelerators) is
available by moving to the ablkcipher crypto API. The improvement is more
 apparent on faster storage devices. There's no noticeable change when hardware
 crypto is not available.
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1.4.12 (GNU/Linux)
 
 iQIcBAABCgAGBQJRjJFjAAoJENaSAD2qAscKuRgQAJkefyLPNBb4plXr3R+zJ1aM
 jkcqkUJWamCxlmqHg/n9LmlxpSZiiWSWJM8iiq8zQhPE0PVXVOVhqvzogT1xwv75
 xfT9xTuRi1v7UFaSGHtj3WoO2nscQ0pjZW/0CHgd/PZjz9y0iJ/l6ueoWCOz5L2i
 3oJvx/W407qM+MSogWKx79i1B2jILdBdQH/7PZ+UJS3jWEo3rMWBbfCwbYhd4pUG
 oVc+qFglNs+3HLdHVUmHPCerCL9qYAJIJmDrvupSOQ6DwdFaV8IysTgSEdFtLcfC
 8Z6DUOPzXnvA/+y+NCCCUxg1CrkgYkNrefLKAq18atFu63zIZIHZyJBTJ5Q6vXVF
 o1H8UcIOg/liGa6lXGf5b4ENNKvB0qMYQgiSrL0/FVVima4zGqUWkQLno4kQl1zx
 FHB5imQ7F/EMcow/nTN3YQYC3N/iYIFAIRxf35SiGGsNhO2sEyIqYlRSyq2MNrRl
 pLWNbhnRuhBUqcbqZDxq1oZ7624Ui4jnHHx7rl6Y3gfm8Xa1ZmQeY6rOadSZaRd7
 +ZqFZi1jiHz1c0tVUO/3DsqABIhbr9Ee03vracN8bVTGV0ZmO0qneugFB9esoeDf
 UnrU0Im8ilHu3OHAyc+UkRZuzThL9bLZEivwICQ+JDUJ1zsLYSQZEaGIt8hA0iDy
 8Bu3gtfX2WxD4ak/AkFv
 =3EhP
 -----END PGP SIGNATURE-----

Merge tag 'ecryptfs-3.10-rc1-ablkcipher' of git://git.kernel.org/pub/scm/linux/kernel/git/tyhicks/ecryptfs

Pull eCryptfs update from Tyler Hicks:
 "Improve performance when AES-NI (and most likely other crypto
  accelerators) is available by moving to the ablkcipher crypto API.
  The improvement is more apparent on faster storage devices.

  There's no noticeable change when hardware crypto is not available"

* tag 'ecryptfs-3.10-rc1-ablkcipher' of git://git.kernel.org/pub/scm/linux/kernel/git/tyhicks/ecryptfs:
  eCryptfs: Use the ablkcipher crypto API
2013-05-10 09:20:01 -07:00
Tyler Hicks 4dfea4f0d7 eCryptfs: Use the ablkcipher crypto API
Make the switch from the blkcipher kernel crypto interface to the
ablkcipher interface.

encrypt_scatterlist() and decrypt_scatterlist() now use the ablkcipher
interface but, from the eCryptfs standpoint, still treat the crypto
operation as a synchronous operation. They submit the async request and
then wait until the operation is finished before they return. Most of
the changes are contained inside those two functions.

Despite waiting for the completion of the crypto operation, the
ablkcipher interface provides performance increases in most cases when
used on AES-NI capable hardware.

Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Acked-by: Colin King <colin.king@canonical.com>
Reviewed-by: Zeev Zilberman <zeev@annapurnaLabs.com>
Cc: Dustin Kirkland <dustin.kirkland@gazzang.com>
Cc: Tim Chen <tim.c.chen@intel.com>
Cc: Ying Huang <ying.huang@intel.com>
Cc: Thieu Le <thieule@google.com>
Cc: Li Wang <dragonylffly@163.com>
Cc: Jarkko Sakkinen <jarkko.sakkinen@iki.fi>
2013-05-09 16:55:07 -07:00
Linus Torvalds 07e074503e Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull more vfs fixes from Al Viro:
 "Regression fix from Geert + yet another open-coded kernel_read()"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  ecryptfs: don't open-code kernel_read()
  xtensa simdisk: Fix proc_create_data() conversion fallout
2013-05-09 13:44:35 -07:00
Al Viro 39dfe6c6a5 ecryptfs: don't open-code kernel_read()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-05-09 13:39:58 -04:00
Kent Overstreet a27bb332c0 aio: don't include aio.h in sched.h
Faster kernel compiles by way of fewer unnecessary includes.

[akpm@linux-foundation.org: fix fallout]
[akpm@linux-foundation.org: fix build]
Signed-off-by: Kent Overstreet <koverstreet@google.com>
Cc: Zach Brown <zab@redhat.com>
Cc: Felipe Balbi <balbi@ti.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Asai Thambi S P <asamymuthupa@micron.com>
Cc: Selvan Mani <smani@micron.com>
Cc: Sam Bradshaw <sbradshaw@micron.com>
Cc: Jeff Moyer <jmoyer@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Reviewed-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-05-07 20:16:25 -07:00
Al Viro 52f21999c7 ecryptfs: close rmmod race
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2013-04-09 14:08:16 -04:00