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Timofey Titovets 19562430c6 Btrfs: heuristic: add Shannon entropy calculation 
Byte distribution check in heuristic will filter edge data cases and
some time fail to classify input data.

Let's fix that by adding Shannon entropy calculation, that will cover
classification of most other data types.

As Shannon entropy needs log2 with some precision to work, let's use
ilog2(N) and for increased precision, by do ilog2(pow(N, 4)).

Shannon entropy has been slightly changed to avoid signed numbers and
division.

The calculation is direct by the formula, successor of precalculated
table or chains of if-else.

The accuracy errors of ilog2 are compensated by

@ENTROPY_LVL_ACEPTABLE 70 -> 65
@ENTROPY_LVL_HIGH      85 -> 80

Signed-off-by: Timofey Titovets <nefelim4ag@gmail.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ update comments ]
Signed-off-by: David Sterba <dsterba@suse.com>
2017-11-01 20:45:36 +01:00
..
9p
9p: set page uptodate when required in write_end()
2017-10-11 09:30:08 -07:00
adfs
…
affs
Merge branch 'work.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-09-14 18:54:01 -07:00
afs
Merge branch 'akpm' (patches from Andrew)
2017-09-06 20:49:49 -07:00
autofs4
Merge branch 'work.set_fs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-09-14 18:13:32 -07:00
befs
VFS: Convert sb->s_flags & MS_RDONLY to sb_rdonly(sb)
2017-07-17 08:45:34 +01:00
bfs
bfs: fix sanity checks for empty files
2017-07-12 16:26:00 -07:00
btrfs
Btrfs: heuristic: add Shannon entropy calculation
2017-11-01 20:45:36 +01:00
cachefiles
VFS: Convert sb->s_flags & MS_RDONLY to sb_rdonly(sb)
2017-07-17 08:45:34 +01:00
ceph
ceph: unlock dangling spinlock in try_flush_caps()
2017-10-25 08:31:15 +02:00
cifs
SMB3: Validate negotiate request must always be signed
2017-10-26 12:20:59 -05:00
coda
fs: fix kernel_read prototype
2017-09-04 19:05:15 -04:00
configfs
configfs: Introduce config_item_get_unless_zero()
2017-06-12 13:20:20 +02:00
cramfs
…
crypto
fscrypt: fix dereference of NULL user_key_payload
2017-10-12 17:16:40 +01:00
debugfs
Merge branch 'work.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-07-15 12:00:42 -07:00
devpts
pty: Repair TIOCGPTPEER
2017-08-24 13:23:03 -07:00
dlm
File locking related changes for v4.14
2017-09-06 13:43:26 -07:00
ecryptfs
ecryptfs: fix dereference of NULL user_key_payload
2017-10-12 17:16:40 +01:00
efivarfs
VFS: Kill off s_options and helpers
2017-07-11 06:09:21 -04:00
efs
VFS: Convert sb->s_flags & MS_RDONLY to sb_rdonly(sb)
2017-07-17 08:45:34 +01:00
exofs
Merge branch 'for-4.14/block' of git://git.kernel.dk/linux-block
2017-09-07 11:59:42 -07:00
exportfs
Merge branch 'rebased-statx' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-03-03 11:38:56 -08:00
ext2
Merge branch 'work.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-09-14 18:54:01 -07:00
ext4
Convert fs/*/* to SB_I_VERSION
2017-10-18 18:51:27 -04:00
f2fs
f2fs: fix potential panic during fstrim
2017-10-03 08:06:05 -07:00
fat
Merge branch 'work.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-09-14 18:54:01 -07:00
freevxfs
…
fscache
FS-Cache: fix dereference of NULL user_key_payload
2017-10-12 17:16:40 +01:00
fuse
fuse: fix READDIRPLUS skipping an entry
2017-10-25 16:34:27 +02:00
gfs2
GFS2: Fix an old regression in GFS2's debugfs interface
2017-09-25 15:41:56 -07:00
hfs
Merge branch 'work.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-09-14 18:54:01 -07:00
hfsplus
Merge branch 'work.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-09-14 18:54:01 -07:00
hostfs
fs: convert a pile of fsync routines to errseq_t based reporting
2017-08-01 08:39:29 -04:00
hpfs
Merge branch 'work.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-09-14 18:54:01 -07:00
hugetlbfs
lib/interval_tree: fast overlap detection
2017-09-08 18:26:49 -07:00
isofs
isofs: fix build regression
2017-09-18 12:24:26 +02:00
jbd2
Writeback error handling fixes (pile #2)
2017-07-07 19:38:17 -07:00
jffs2
Merge branch 'work.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-09-14 18:54:01 -07:00
jfs
Merge branch 'work.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-09-14 18:54:01 -07:00
kernfs
Merge branch 'for-4.14/block' of git://git.kernel.dk/linux-block
2017-09-07 11:59:42 -07:00
lockd
NFS client updates for Linux 4.14
2017-09-11 22:01:44 -07:00
minix
VFS: Convert sb->s_flags & MS_RDONLY to sb_rdonly(sb)
2017-07-17 08:45:34 +01:00
ncpfs
fs: convert a pile of fsync routines to errseq_t based reporting
2017-08-01 08:39:29 -04:00
nfs
NFSv4/pnfs: Fix an infinite layoutget loop
2017-10-04 14:06:54 -04:00
nfs_common
netns: make struct pernet_operations::id unsigned int
2016-11-18 10:59:15 -05:00
nfsd
nfsd4: define nfsd4_secinfo_no_name_release()
2017-10-05 14:45:25 -04:00
nilfs2
Merge branch 'work.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-09-14 18:54:01 -07:00
nls
…
notify
fsnotify: make dnotify_fsnotify_ops const
2017-08-30 16:02:48 +02:00
ntfs
Merge branch 'work.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-09-14 18:54:01 -07:00
ocfs2
Merge branch 'work.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-09-14 18:54:01 -07:00
omfs
omfs: Implement show_options
2017-07-06 03:31:46 -04:00
openpromfs
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
orangefs
orangefs: Adjust three checks for null pointers
2017-09-14 14:58:31 -04:00
overlayfs
ovl: do not cleanup unsupported index entries
2017-10-24 16:06:17 +02:00
proc
sched/debug: Add explicit TASK_PARKED printing
2017-09-29 11:02:57 +02:00
pstore
Revert "pstore: Honor dmesg_restrict sysctl on dmesg dumps"
2017-08-17 16:29:19 -07:00
qnx4
…
qnx6
…
quota
quota: Generate warnings for DQUOT_SPACE_NOFAIL allocations
2017-10-10 17:24:46 +02:00
ramfs
mm: make pagevec_lookup() update index
2017-09-06 17:27:26 -07:00
reiserfs
Merge branch 'work.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-09-14 18:54:01 -07:00
romfs
romfs: use different way to generate fsid for BLOCK or MTD
2017-01-24 16:26:14 -08:00
squashfs
squashfs: Add zstd support
2017-09-08 19:33:25 -07:00
sysfs
sysfs: be careful of error returns from ops->show()
2017-04-08 17:33:32 +02:00
sysv
VFS: Convert sb->s_flags & MS_RDONLY to sb_rdonly(sb)
2017-07-17 08:45:34 +01:00
tracefs
VFS: Don't use save/replace_mount_options if not using generic_show_options
2017-07-06 03:31:46 -04:00
ubifs
Merge branch 'work.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-09-14 18:54:01 -07:00
udf
Merge branch 'work.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-09-14 18:54:01 -07:00
ufs
VFS: Convert sb->s_flags & MS_RDONLY to sb_rdonly(sb)
2017-07-17 08:45:34 +01:00
xfs
Changes since last time:
2017-10-26 08:45:40 +02:00
aio.c
Merge branch 'work.read_write' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-09-14 19:29:55 -07:00
anon_inodes.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
attr.c
sched/headers: Prepare for new header dependencies before moving code to <linux/sched/signal.h>
2017-03-02 08:42:29 +01:00
bad_inode.c
statx: Add a system call to make enhanced file info available
2017-03-02 20:51:15 -05:00
binfmt_aout.c
fs: fix kernel_read prototype
2017-09-04 19:05:15 -04:00
binfmt_elf_fdpic.c
Merge branch 'work.set_fs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-09-14 18:13:32 -07:00
binfmt_elf.c
Merge branch 'work.set_fs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-09-14 18:13:32 -07:00
binfmt_em86.c
…
binfmt_flat.c
Merge branch 'work.set_fs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-09-14 18:13:32 -07:00
binfmt_misc.c
fs/binfmt_misc.c: node could be NULL when evicting inode
2017-10-13 16:18:33 -07:00
binfmt_script.c
exec: load_script: kill the onstack interp[BINPRM_BUF_SIZE] array
2017-10-03 17:54:25 -07:00
block_dev.c
fs/mpage.c: fix mpage_writepage() for pages with buffers
2017-10-13 16:18:33 -07:00
buffer.c
Merge branch 'for-4.14/block' of git://git.kernel.dk/linux-block
2017-09-07 11:59:42 -07:00
char_dev.c
char_dev: order /proc/devices by major number
2017-07-17 15:28:50 +02:00
compat_binfmt_elf.c
fs/binfmt: Convert obsolete cputime type to nsecs
2017-02-01 09:13:51 +01:00
compat_ioctl.c
media: get rid of removed DMX_GET_CAPS and DMX_SET_SOURCE leftovers
2017-09-05 08:25:07 -04:00
compat.c
fs/compat.c: trim unused includes
2017-04-17 12:52:27 -04:00
coredump.c
mm: treewide: remove GFP_TEMPORARY allocation flag
2017-09-13 18:53:16 -07:00
dax.c
- Some request-based DM core and DM multipath fixes and cleanups
2017-09-14 13:43:16 -07:00
dcache.c
Merge branch 'work.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-07-15 12:00:42 -07:00
dcookies.c
Replace <asm/uaccess.h> with <linux/uaccess.h> globally
2016-12-24 11:46:01 -08:00
direct-io.c
Changes since last update:
2017-10-18 14:51:50 -04:00
drop_caches.c
…
eventfd.c
There has been a fair amount of activity in the docs tree this time
2017-07-03 21:13:25 -07:00
eventpoll.c
fs/epoll: use faster rb_first_cached()
2017-09-08 18:26:49 -07:00
exec.c
membarrier: Provide register expedited private command
2017-10-19 22:13:40 -04:00
fcntl.c
fcntl: Don't set si_code to SI_SIGIO when sig == SIGPOLL
2017-09-18 22:51:14 -05:00
fhandle.c
fhandle: move compat syscalls from compat.c
2017-04-17 12:52:26 -04:00
file_table.c
fput: Don't reinvent the wheel but use existing llist API
2017-08-28 00:50:23 -04:00
file.c
fs/file.c: replace alloc_fdmem() with kvmalloc() alternative
2017-07-06 16:24:30 -07:00
filesystems.c
Merge branch 'work.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-07-15 12:00:42 -07:00
fs_pin.c
sched/wait: Disambiguate wq_entry->task_list and wq_head->task_list naming
2017-06-20 12:19:14 +02:00
fs_struct.c
sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task.h>
2017-03-02 08:42:35 +01:00
fs-writeback.c
writeback: rework wb_[dec|inc]_stat family of functions
2017-07-12 16:26:05 -07:00
inode.c
Merge branch 'overlayfs-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs
2017-09-13 09:11:44 -07:00
internal.h
Merge branch 'overlayfs-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs
2017-09-13 09:11:44 -07:00
ioctl.c
sched/headers: Prepare for the reduction of <linux/sched.h>'s signal API dependency
2017-03-02 08:42:37 +01:00
iomap.c
fs: invalidate page cache after end_io() in dio completion
2017-10-16 12:11:56 -07:00
Kconfig
fs/Kconfig: kill CONFIG_PERCPU_RWSEM some more
2017-07-12 16:26:00 -07:00
Kconfig.binfmt
…
libfs.c
fs: convert __generic_file_fsync to use errseq_t based reporting
2017-07-06 07:02:29 -04:00
locks.c
locks: restore a warn for leaked locks on close
2017-07-21 13:57:31 -04:00
Makefile
logfs: remove from tree
2016-12-14 23:48:11 -05:00
mbcache.c
ext4: xattr inode deduplication
2017-06-22 11:44:55 -04:00
mount.h
Now that IPC and other changes have landed, enable manual markings for
2017-07-19 08:55:18 -07:00
mpage.c
fs/mpage.c: fix mpage_writepage() for pages with buffers
2017-10-13 16:18:33 -07:00
namei.c
Merge branch 'work.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-09-14 18:54:01 -07:00
namespace.c
vfs: fix mounting a filesystem with i_version
2017-10-17 02:22:07 -04:00
no-block.c
…
nsfs.c
VFS: Provide empty name qstr
2017-07-06 03:27:09 -04:00
open.c
ovl: don't allow writing ioctl on lower layer
2017-09-05 12:53:12 +02:00
pipe.c
VFS: Provide empty name qstr
2017-07-06 03:27:09 -04:00
pnode.c
mnt: Make propagate_umount less slow for overlapping mount propagation trees
2017-05-23 08:41:17 -05:00
pnode.h
mnt: Tuck mounts under others instead of creating shadow/side mounts.
2017-02-04 00:01:06 +13:00
posix_acl.c
sched/headers: Prepare to remove <linux/cred.h> inclusion from <linux/sched.h>
2017-03-02 08:42:31 +01:00
proc_namespace.c
VFS: Convert sb->s_flags & MS_RDONLY to sb_rdonly(sb)
2017-07-17 08:45:34 +01:00
read_write.c
vfs: Return -ENXIO for negative SEEK_HOLE / SEEK_DATA offsets
2017-09-26 13:46:06 -07:00
readdir.c
readdir: move compat syscalls from compat.c
2017-04-17 12:52:24 -04:00
select.c
fs/select: Fix memory corruption in compat_get_fd_set()
2017-08-28 16:09:19 -07:00
seq_file.c
mm: introduce kv[mz]alloc helpers
2017-05-08 17:15:12 -07:00
signalfd.c
signal: Remove kernel interal si_code magic
2017-07-24 14:30:28 -05:00
splice.c
fs: move kernel_write to fs/read_write.c
2017-09-04 19:05:15 -04:00
stack.c
…
stat.c
fs: Provide __inode_get_bytes()
2017-08-17 22:06:03 +02:00
statfs.c
Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-07-08 10:50:54 -07:00
super.c
Merge branch 'work.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-09-14 18:54:01 -07:00
sync.c
Merge branch 'work.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-09-14 18:54:01 -07:00
timerfd.c
timerfd: Use get_itimerspec64() and put_itimerspec64()
2017-06-30 04:14:38 -04:00
userfaultfd.c
userfaultfd: non-cooperative: fix fork use after free
2017-10-03 17:54:25 -07:00
utimes.c
utimes: Make utimes y2038 safe
2017-09-03 20:24:30 -04:00
xattr.c
lsm: fix smack_inode_removexattr and xattr_getsecurity memleak
2017-10-04 18:03:15 +11:00