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* ext4 crypto: migrate into vfs's crypto engineJaegeuk Kim2016-07-101-20/+15
| | | | | | | | | This patch removes the most parts of internal crypto codes. And then, it modifies and adds some ext4-specific crypt codes to use the generic facility. Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
* mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macrosKirill A. Shutemov2016-04-041-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time ago with promise that one day it will be possible to implement page cache with bigger chunks than PAGE_SIZE. This promise never materialized. And unlikely will. We have many places where PAGE_CACHE_SIZE assumed to be equal to PAGE_SIZE. And it's constant source of confusion on whether PAGE_CACHE_* or PAGE_* constant should be used in a particular case, especially on the border between fs and mm. Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much breakage to be doable. Let's stop pretending that pages in page cache are special. They are not. The changes are pretty straight-forward: - <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>; - <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>; - PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN}; - page_cache_get() -> get_page(); - page_cache_release() -> put_page(); This patch contains automated changes generated with coccinelle using script below. For some reason, coccinelle doesn't patch header files. I've called spatch for them manually. The only adjustment after coccinelle is revert of changes to PAGE_CAHCE_ALIGN definition: we are going to drop it later. There are few places in the code where coccinelle didn't reach. I'll fix them manually in a separate patch. Comments and documentation also will be addressed with the separate patch. virtual patch @@ expression E; @@ - E << (PAGE_CACHE_SHIFT - PAGE_SHIFT) + E @@ expression E; @@ - E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) + E @@ @@ - PAGE_CACHE_SHIFT + PAGE_SHIFT @@ @@ - PAGE_CACHE_SIZE + PAGE_SIZE @@ @@ - PAGE_CACHE_MASK + PAGE_MASK @@ expression E; @@ - PAGE_CACHE_ALIGN(E) + PAGE_ALIGN(E) @@ expression E; @@ - page_cache_get(E) + get_page(E) @@ expression E; @@ - page_cache_release(E) + put_page(E) Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: Michal Hocko <mhocko@suse.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Merge branch 'work.symlinks' of ↵Linus Torvalds2016-01-111-15/+14
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull vfs RCU symlink updates from Al Viro: "Replacement of ->follow_link/->put_link, allowing to stay in RCU mode even if the symlink is not an embedded one. No changes since the mailbomb on Jan 1" * 'work.symlinks' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: switch ->get_link() to delayed_call, kill ->put_link() kill free_page_put_link() teach nfs_get_link() to work in RCU mode teach proc_self_get_link()/proc_thread_self_get_link() to work in RCU mode teach shmem_get_link() to work in RCU mode teach page_get_link() to work in RCU mode replace ->follow_link() with new method that could stay in RCU mode don't put symlink bodies in pagecache into highmem namei: page_getlink() and page_follow_link_light() are the same thing ufs: get rid of ->setattr() for symlinks udf: don't duplicate page_symlink_inode_operations logfs: don't duplicate page_symlink_inode_operations switch befs long symlinks to page_symlink_operations
| * switch ->get_link() to delayed_call, kill ->put_link()Al Viro2015-12-301-4/+4
| | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * replace ->follow_link() with new method that could stay in RCU modeAl Viro2015-12-081-5/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | new method: ->get_link(); replacement of ->follow_link(). The differences are: * inode and dentry are passed separately * might be called both in RCU and non-RCU mode; the former is indicated by passing it a NULL dentry. * when called that way it isn't allowed to block and should return ERR_PTR(-ECHILD) if it needs to be called in non-RCU mode. It's a flagday change - the old method is gone, all in-tree instances converted. Conversion isn't hard; said that, so far very few instances do not immediately bail out when called in RCU mode. That'll change in the next commits. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * don't put symlink bodies in pagecache into highmemAl Viro2015-12-081-7/+3
| | | | | | | | | | | | | | | | | | | | | | | | kmap() in page_follow_link_light() needed to go - allowing to hold an arbitrary number of kmaps for long is a great way to deadlocking the system. new helper (inode_nohighmem(inode)) needs to be used for pagecache symlinks inodes; done for all in-tree cases. page_follow_link_light() instrumented to yell about anything missed. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | ext4: fix an endianness bug in ext4_encrypted_follow_link()Al Viro2015-11-261-1/+1
|/ | | | | | | | applying le32_to_cpu() to 16bit value is a bad idea... Cc: stable@vger.kernel.org # v4.1+ Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
* ext4: call out CRC and corruption errors with specific error codesDarrick J. Wong2015-10-171-1/+1
| | | | | | | | Instead of overloading EIO for CRC errors and corrupt structures, return the same error codes that XFS returns for the same issues. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
* Merge tag 'ext4_for_linus' of ↵Linus Torvalds2015-06-251-12/+8
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 Pull ext4 updates from Ted Ts'o: "A very large number of cleanups and bug fixes --- in particular for the ext4 encryption patches, which is a new feature added in the last merge window. Also fix a number of long-standing xfstest failures. (Quota writes failing due to ENOSPC, a race between truncate and writepage in data=journalled mode that was causing generic/068 to fail, and other corner cases.) Also add support for FALLOC_FL_INSERT_RANGE, and improve jbd2 performance eliminating locking when a buffer is modified more than once during a transaction (which is very common for allocation bitmaps, for example), in which case the state of the journalled buffer head doesn't need to change" [ I renamed "ext4_follow_link()" to "ext4_encrypted_follow_link()" in the merge resolution, to make it clear that that function is _only_ used for encrypted symlinks. The function doesn't actually work for non-encrypted symlinks at all, and they use the generic helpers - Linus ] * tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: (52 commits) ext4: set lazytime on remount if MS_LAZYTIME is set by mount ext4: only call ext4_truncate when size <= isize ext4: make online defrag error reporting consistent ext4: minor cleanup of ext4_da_reserve_space() ext4: don't retry file block mapping on bigalloc fs with non-extent file ext4: prevent ext4_quota_write() from failing due to ENOSPC ext4: call sync_blockdev() before invalidate_bdev() in put_super() jbd2: speedup jbd2_journal_dirty_metadata() jbd2: get rid of open coded allocation retry loop ext4: improve warning directory handling messages jbd2: fix ocfs2 corrupt when updating journal superblock fails ext4: mballoc: avoid 20-argument function call ext4: wait for existing dio workers in ext4_alloc_file_blocks() ext4: recalculate journal credits as inode depth changes jbd2: use GFP_NOFS in jbd2_cleanup_journal_tail() ext4: use swap() in mext_page_double_lock() ext4: use swap() in memswap() ext4: fix race between truncate and __ext4_journalled_writepage() ext4 crypto: fail the mount if blocksize != pagesize ext4: Add support FALLOC_FL_INSERT_RANGE for fallocate ...
| * ext4 crypto: use per-inode tfm structureTheodore Ts'o2015-05-311-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | As suggested by Herbert Xu, we shouldn't allocate a new tfm each time we read or write a page. Instead we can use a single tfm hanging off the inode's crypt_info structure for all of our encryption needs for that inode, since the tfm can be used by multiple crypto requests in parallel. Also use cmpxchg() to avoid races that could result in crypt_info structure getting doubly allocated or doubly freed. Signed-off-by: Theodore Ts'o <tytso@mit.edu>
| * ext4 crypto: reorganize how we store keys in the inodeTheodore Ts'o2015-05-181-10/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This is a pretty massive patch which does a number of different things: 1) The per-inode encryption information is now stored in an allocated data structure, ext4_crypt_info, instead of directly in the node. This reduces the size usage of an in-memory inode when it is not using encryption. 2) We drop the ext4_fname_crypto_ctx entirely, and use the per-inode encryption structure instead. This remove an unnecessary memory allocation and free for the fname_crypto_ctx as well as allowing us to reuse the ctfm in a directory for multiple lookups and file creations. 3) We also cache the inode's policy information in the ext4_crypt_info structure so we don't have to continually read it out of the extended attributes. 4) We now keep the keyring key in the inode's encryption structure instead of releasing it after we are done using it to derive the per-inode key. This allows us to test to see if the key has been revoked; if it has, we prevent the use of the derived key and free it. 5) When an inode is released (or when the derived key is freed), we will use memset_explicit() to zero out the derived key, so it's not left hanging around in memory. This implies that when a user logs out, it is important to first revoke the key, and then unlink it, and then finally, to use "echo 3 > /proc/sys/vm/drop_caches" to release any decrypted pages and dcache entries from the system caches. 6) All this, and we also shrink the number of lines of code by around 100. :-) Signed-off-by: Theodore Ts'o <tytso@mit.edu>
| * ext4 crypto: don't allocate a page when encrypting/decrypting file namesTheodore Ts'o2015-05-181-0/+1
| | | | | | | | Signed-off-by: Theodore Ts'o <tytso@mit.edu>
* | don't pass nameidata to ->follow_link()Al Viro2015-05-101-1/+1
| | | | | | | | | | | | | | its only use is getting passed to nd_jump_link(), which can obtain it from current->nameidata Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | new ->follow_link() and ->put_link() calling conventionsAl Viro2015-05-101-5/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | a) instead of storing the symlink body (via nd_set_link()) and returning an opaque pointer later passed to ->put_link(), ->follow_link() _stores_ that opaque pointer (into void * passed by address by caller) and returns the symlink body. Returning ERR_PTR() on error, NULL on jump (procfs magic symlinks) and pointer to symlink body for normal symlinks. Stored pointer is ignored in all cases except the last one. Storing NULL for opaque pointer (or not storing it at all) means no call of ->put_link(). b) the body used to be passed to ->put_link() implicitly (via nameidata). Now only the opaque pointer is. In the cases when we used the symlink body to free stuff, ->follow_link() now should store it as opaque pointer in addition to returning it. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | ext4: switch to simple_follow_link()Al Viro2015-05-101-8/+1
| | | | | | | | | | | | | | for fast symlinks only, of course... Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | ext4: split inode_operations for encrypted symlinks off the restAl Viro2015-05-101-20/+10
|/ | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* Merge tag 'for_linus_stable' of ↵Linus Torvalds2015-05-031-1/+1
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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
| * ext4 crypto: simplify and speed up filename encryptionTheodore Ts'o2015-05-011-1/+1
| | | | | | | | | | | | | | | | | | 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>
* | Merge branch 'for-linus' of ↵Linus Torvalds2015-04-261-4/+4
|\ \ | |/ |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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
| * VFS: normal filesystems (and lustre): d_inode() annotationsDavid Howells2015-04-151-1/+1
| | | | | | | | | | | | | | 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>
* | ext4 crypto: add symlink encryptionTheodore Ts'o2015-04-161-1/+95
| | | | | | | | | | Signed-off-by: Uday Savagaonkar <savagaon@google.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
* | ext4: remove unused header filesSheng Yong2015-04-021-1/+0
|/ | | | | | | | Remove unused header files and header files which are included in ext4.h. Signed-off-by: Sheng Yong <shengyong1@huawei.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
* ext4: Remove CONFIG_EXT4_FS_XATTRTao Ma2012-12-101-4/+0
| | | | | | | | | | | | | | | | | | | | | | | | Ted has sent out a RFC about removing this feature. Eric and Jan confirmed that both RedHat and SUSE enable this feature in all their product. David also said that "As far as I know, it's enabled in all Android kernels that use ext4." So it seems OK for us. And what's more, as inline data depends its implementation on xattr, and to be frank, I don't run any test again inline data enabled while xattr disabled. So I think we should add inline data and remove this config option in the same release. [ The savings if you disable CONFIG_EXT4_FS_XATTR is only 27k, which isn't much in the grand scheme of things. Since no one seems to be testing this configuration except for some automated compile farms, on balance we are better removing this config option, and so that it is effectively always enabled. -- tytso ] Cc: David Brown <davidb@codeaurora.org> Cc: Eric Sandeen <sandeen@redhat.com> Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Tao Ma <boyu.mt@taobao.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: symlink must be handled via filesystem specific operationDmitry Monakhov2010-05-161-0/+2
| | | | | | | | generic setattr implementation is no longer responsible for quota transfer so synlinks must be handled via ext4_setattr. Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: Rename ext4dev to ext4Theodore Ts'o2008-10-101-2/+2
| | | | | | | | The ext4 filesystem is getting stable enough that it's time to drop the "dev" prefix. Also remove the requirement for the TEST_FILESYS flag. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: Fix whitespace checkpatch warnings/errorsTheodore Ts'o2008-09-081-2/+2
| | | | | Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: move headers out of include/linuxChristoph Hellwig2008-04-291-1/+1
| | | | | | | | | | Move ext4 headers out of include/linux. This is just the trivial move, there's some more thing that could be done later. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Mingming Cao <cmm@us.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* [PATCH] mark struct inode_operations const 1Arjan van de Ven2007-02-121-2/+2
| | | | | | | | | | | Many struct inode_operations in the kernel can be "const". Marking them const moves these to the .rodata section, which avoids false sharing with potential dirty data. In addition it'll catch accidental writes at compile time to these shared resources. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [PATCH] jbd2: enable building of jbd2 and have ext4 use it rather than jbdMingming Cao2006-10-111-1/+1
| | | | | | | | | | Reworked from a patch by Mingming Cao and Randy Dunlap Signed-off-By: Randy Dunlap <rdunlap@xenotime.net> Signed-off-by: Mingming Cao <cmm@us.ibm.com> Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] ext4: rename ext4 symbols to avoid duplication of ext3 symbolsMingming Cao2006-10-111-12/+12
| | | | | | | | | | Mingming Cao originally did this work, and Shaggy reproduced it using some scripts from her. Signed-off-by: Mingming Cao <cmm@us.ibm.com> Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] ext4: initial copy of files from ext3Dave Kleikamp2006-10-111-0/+54
Start of the ext4 patch series. See Documentation/filesystems/ext4.txt for details. This is a simple copy of the files in fs/ext3 to fs/ext4 and /usr/incude/linux/ext3* to /usr/include/ex4* Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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