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2016-12-14ubifs: Initialize fstr_real_lenRichard Weinberger1-1/+1
While fstr_real_len is only being used under if (encrypted), gcc-6 still warns. Fixes this false positive: fs/ubifs/dir.c: In function 'ubifs_readdir': fs/ubifs/dir.c:629:13: warning: 'fstr_real_len' may be used uninitialized in this function [-Wmaybe-uninitialized] fstr.len = fstr_real_len Initialize fstr_real_len to make gcc happy. Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-13ubifs: Use fscrypt ioctl() helpersRichard Weinberger2-24/+4
Commit db717d8e26c2 ("fscrypto: move ioctl processing more fully into common code") moved ioctl() related functions into fscrypt and offers us now a set of helper functions. Signed-off-by: Richard Weinberger <richard@nod.at> Reviewed-by: David Gstir <david@sigma-star.at>
2016-12-13ubifs: Use FS_CFLG_OWN_PAGESRichard Weinberger1-1/+1
Commit bd7b8290388d ("fscrypt: Cleanup page locking requirements for fscrypt_{decrypt,encrypt}_page()") renamed the flag. Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Raise write version to 5Richard Weinberger2-1/+20
Starting with version 5 the following properties change: - UBIFS_FLG_DOUBLE_HASH is mandatory - UBIFS_FLG_ENCRYPTION is optional but depdens on UBIFS_FLG_DOUBLE_HASH - Filesystems with unknown super block flags will be rejected, this allows us in future to add new features without raising the UBIFS write version. Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Implement UBIFS_FLG_ENCRYPTIONRichard Weinberger4-0/+50
This feature flag indicates that the filesystem contains encrypted files. Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Implement UBIFS_FLG_DOUBLE_HASHRichard Weinberger5-3/+21
This feature flag indicates that all directory entry nodes have a 32bit cookie set and therefore UBIFS is allowed to perform lookups by hash. Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Use a random number for cookiesRichard Weinberger2-0/+4
Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Add full hash lookup supportRichard Weinberger5-7/+98
UBIFS stores a 32bit hash of every file, for traditional lookups by name this scheme is fine since UBIFS can first try to find the file by the hash of the filename and upon collisions it can walk through all entries with the same hash and do a string compare. When filesnames are encrypted fscrypto will ask the filesystem for a unique cookie, based on this cookie the filesystem has to be able to locate the target file again. With 32bit hashes this is impossible because the chance for collisions is very high. Do deal with that we store a 32bit cookie directly in the UBIFS directory entry node such that we get a 64bit cookie (32bit from filename hash and the dent cookie). For a lookup by hash UBIFS finds the entry by the first 32bit and then compares the dent cookie. If it does not match, it has to do a linear search of the whole directory and compares all dent cookies until the correct entry is found. Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Rename tnc_read_node_nmRichard Weinberger1-6/+6
tnc_read_hashed_node() is a better name since we read a node by a given hash, not a name. Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Add support for encrypted symlinksRichard Weinberger3-13/+126
Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Implement encrypted filenamesRichard Weinberger8-197/+414
Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: David Gstir <david@sigma-star.at> Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Make r5 hash binary string awareRichard Weinberger1-1/+1
As of now all filenames known by UBIFS are strings with a NUL terminator. With encrypted filenames a filename can be any binary string and the r5 function cannot search for the NUL terminator. UBIFS always knows how long a filename is, therefore we can change the hash function to iterate over the filename length to work correctly with binary strings. Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Relax checks in ubifs_validate_entry()Richard Weinberger1-1/+1
With encrypted filenames we store raw binary data, doing string tests is no longer possible. Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Implement encrypt/decrypt for all IORichard Weinberger5-28/+152
Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: David Gstir <david@sigma-star.at> Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Constify struct inode pointer in ubifs_crypt_is_encrypted()Richard Weinberger3-3/+8
...and provide a non const variant for fscrypto Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Introduce new data node field, compr_sizeRichard Weinberger2-15/+2
When data of a data node is compressed and encrypted we need to store the size of the compressed data because before encryption we may have to add padding bytes. For the new field we consume the last two padding bytes in struct ubifs_data_node. Two bytes are fine because the data length is at most 4096. Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Enforce crypto policy in mmapRichard Weinberger1-0/+9
We need this extra check in mmap because a process could gain an already opened fd. Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Massage assert in ubifs_xattr_set() wrt. fscryptoRichard Weinberger1-1/+7
When we're creating a new inode in UBIFS the inode is not yet exposed and fscrypto calls ubifs_xattr_set() without holding the inode mutex. This is okay but ubifs_xattr_set() has to know about this. Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Preload crypto context in ->lookup()Richard Weinberger1-0/+15
...and mark the dentry as encrypted. Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Enforce crypto policy in ->link and ->renameRichard Weinberger1-0/+17
When a file is moved or linked into another directory its current crypto policy has to be compatible with the target policy. Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Implement file open operationRichard Weinberger1-0/+30
We need ->open() for files to load the crypto key. If the no key is present and the file is encrypted, refuse to open. Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Implement directory open operationRichard Weinberger1-0/+9
We need the ->open() hook to load the crypto context which is needed for all crypto operations within that directory. Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Massage ubifs_listxattr() for encryption contextRichard Weinberger1-4/+15
We have to make sure that we don't expose our internal crypto context to userspace. Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Add skeleton for fscryptoRichard Weinberger9-2/+178
This is the first building block to provide file level encryption on UBIFS. Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Define UBIFS crypto context xattrRichard Weinberger1-0/+7
Like ext4 UBIFS will store the crypto context in a xattr attribute. Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Export xattr get and set functionsRichard Weinberger2-17/+22
For fscrypto we need this function outside of xattr.c. Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Export ubifs_check_dir_empty()Richard Weinberger2-4/+5
fscrypto will need this function too. Also get struct ubifs_info from the provided inode. Not all callers will have a reference to struct ubifs_info. Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Remove some dead codeChristophe Jaillet1-4/+0
'ubifs_fast_find_freeable()' can not return an error pointer, so this test can be removed. Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Use dirty_writeback_interval value for wbuf timerRafał Miłecki2-8/+4
Right now wbuf timer has hardcoded timeouts and there is no place for manual adjustments. Some projects / cases many need that though. Few file systems allow doing that by respecting dirty_writeback_interval that can be set using sysctl (dirty_writeback_centisecs). Lowering dirty_writeback_interval could be some way of dealing with user space apps lacking proper fsyncs. This is definitely *not* a perfect solution but we don't have ideal (user space) world. There were already advanced discussions on this matter, mostly when ext4 was introduced and it wasn't behaving as ext3. Anyway, the final decision was to add some hacks to the ext4, as trying to fix whole user space or adding new API was pointless. We can't (and shouldn't?) just follow ext4. We can't e.g. sync on close as this would cause too many commits and flash wearing. On the other hand we still should allow some trade-off between -o sync and default wbuf timeout. Respecting dirty_writeback_interval should allow some sane cutomizations if used warily. Signed-off-by: Rafał Miłecki <rafal@milecki.pl> Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-12ubifs: Drop softlimit and delta fields from struct ubifs_wbufRafał Miłecki2-13/+10
Values of these fields are set during init and never modified. They are used (read) in a single function only. There isn't really any reason to keep them in a struct. It only makes struct just a bit bigger without any visible gain. Signed-off-by: Rafał Miłecki <rafal@milecki.pl> Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2016-12-09vfs: remove ".readlink = generic_readlink" assignmentsMiklos Szeredi1-1/+0
If .readlink == NULL implies generic_readlink(). Generated by: to_del="\.readlink.*=.*generic_readlink" for i in `git grep -l $to_del`; do sed -i "/$to_del"/d $i; done Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2016-10-28ubifs: Fix regression in ubifs_readdir()Richard Weinberger1-0/+8
Commit c83ed4c9dbb35 ("ubifs: Abort readdir upon error") broke overlayfs support because the fix exposed an internal error code to VFS. Reported-by: Peter Rosin <peda@axentia.se> Tested-by: Peter Rosin <peda@axentia.se> Reported-by: Ralph Sennhauser <ralph.sennhauser@gmail.com> Tested-by: Ralph Sennhauser <ralph.sennhauser@gmail.com> Fixes: c83ed4c9dbb35 ("ubifs: Abort readdir upon error") Cc: stable@vger.kernel.org Signed-off-by: Richard Weinberger <richard@nod.at>
2016-10-20ubifs: Abort readdir upon errorRichard Weinberger1-5/+3
If UBIFS is facing an error while walking a directory, it reports this error and ubifs_readdir() returns the error code. But the VFS readdir logic does not make the getdents system call fail in all cases. When the readdir cursor indicates that more entries are present, the system call will just return and the libc wrapper will try again since it also knows that more entries are present. This causes the libc wrapper to busy loop for ever when a directory is corrupted on UBIFS. A common approach do deal with corrupted directory entries is skipping them by setting the cursor to the next entry. On UBIFS this approach is not possible since we cannot compute the next directory entry cursor position without reading the current entry. So all we can do is setting the cursor to the "no more entries" position and make getdents exit. Cc: stable@vger.kernel.org Signed-off-by: Richard Weinberger <richard@nod.at>
2016-10-20ubifs: Fix xattr_names length in exit pathsRichard Weinberger1-0/+2
When the operation fails we also have to undo the changes we made to ->xattr_names. Otherwise listxattr() will report wrong lengths. Cc: stable@vger.kernel.org Signed-off-by: Richard Weinberger <richard@nod.at>
2016-10-20ubifs: Rename ubifs_rename2Richard Weinberger1-6/+6
Since ->rename2 is gone, rename ubifs_rename2() to ubifs_rename(). Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Richard Weinberger <richard@nod.at>
2016-10-11Merge tag 'upstream-4.9-rc1' of git://git.infradead.org/linux-ubifsLinus Torvalds9-42/+411
Pull UBI/UBIFS updates from Richard Weinberger: "This pull request contains: - Fixes for both UBI and UBIFS - overlayfs support (O_TMPFILE, RENAME_WHITEOUT/EXCHANGE) - Code refactoring for the upcoming MLC support" [ Ugh, we just got rid of the "rename2()" naming for the extended rename functionality. And this re-introduces it in ubifs with the cross- renaming and whiteout support. But rather than do any re-organizations in the merge itself, the naming can be cleaned up later ] * tag 'upstream-4.9-rc1' of git://git.infradead.org/linux-ubifs: (27 commits) UBIFS: improve function-level documentation ubifs: fix host xattr_len when changing xattr ubifs: Use move variable in ubifs_rename() ubifs: Implement RENAME_EXCHANGE ubifs: Implement RENAME_WHITEOUT ubifs: Implement O_TMPFILE ubi: Fix Fastmap's update_vol() ubi: Fix races around ubi_refill_pools() ubi: Deal with interrupted erasures in WL UBI: introduce the VID buffer concept UBI: hide EBA internals UBI: provide an helper to query LEB information UBI: provide an helper to check whether a LEB is mapped or not UBI: add an helper to check lnum validity UBI: simplify LEB write and atomic LEB change code UBI: simplify recover_peb() code UBI: move the global ech and vidh variables into struct ubi_attach_info UBI: provide helpers to allocate and free aeb elements UBI: fastmap: use ubi_io_{read, write}_data() instead of ubi_io_{read, write}() UBI: fastmap: use ubi_rb_for_each_entry() in unmap_peb() ...
2016-10-10Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfsLinus Torvalds1-2/+6
Pull more vfs updates from Al Viro: ">rename2() work from Miklos + current_time() from Deepa" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: fs: Replace current_fs_time() with current_time() fs: Replace CURRENT_TIME_SEC with current_time() for inode timestamps fs: Replace CURRENT_TIME with current_time() for inode timestamps fs: proc: Delete inode time initializations in proc_alloc_inode() vfs: Add current_time() api vfs: add note about i_op->rename changes to porting fs: rename "rename2" i_op to "rename" vfs: remove unused i_op->rename fs: make remaining filesystems use .rename2 libfs: support RENAME_NOREPLACE in simple_rename() fs: support RENAME_NOREPLACE for local filesystems ncpfs: fix unused variable warning
2016-10-10Merge branch 'work.xattr' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfsLinus Torvalds2-9/+0
Pull vfs xattr updates from Al Viro: "xattr stuff from Andreas This completes the switch to xattr_handler ->get()/->set() from ->getxattr/->setxattr/->removexattr" * 'work.xattr' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: vfs: Remove {get,set,remove}xattr inode operations xattr: Stop calling {get,set,remove}xattr inode operations vfs: Check for the IOP_XATTR flag in listxattr xattr: Add __vfs_{get,set,remove}xattr helpers libfs: Use IOP_XATTR flag for empty directory handling vfs: Use IOP_XATTR flag for bad-inode handling vfs: Add IOP_XATTR inode operations flag vfs: Move xattr_resolve_name to the front of fs/xattr.c ecryptfs: Switch to generic xattr handlers sockfs: Get rid of getxattr iop sockfs: getxattr: Fail with -EOPNOTSUPP for invalid attribute names kernfs: Switch to generic xattr handlers hfs: Switch to generic xattr handlers jffs2: Remove jffs2_{get,set,remove}xattr macros xattr: Remove unnecessary NULL attribute name check
2016-10-08Merge remote-tracking branch 'jk/vfs' into work.miscAl Viro1-1/+1
2016-10-07vfs: Remove {get,set,remove}xattr inode operationsAndreas Gruenbacher2-9/+0
These inode operations are no longer used; remove them. Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-10-02UBIFS: improve function-level documentationJulia Lawall5-7/+5
Fix various inconsistencies in the documentation associated with various functions. In the case of fs/ubifs/lprops.c, the second parameter of ubifs_get_lp_stats was renamed from st to lst in commit 84abf972ccff ("UBIFS: add re-mount debugging checks") In the case of fs/ubifs/lpt_commit.c, the excess variables have never existed in the associated functions since the code was introduced into the kernel. The others appear to be straightforward typos. Issues detected using Coccinelle (http://coccinelle.lip6.fr/) Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr> Signed-off-by: Richard Weinberger <richard@nod.at>
2016-10-02ubifs: fix host xattr_len when changing xattrPascal Eberhard1-2/+4
When an extended attribute is changed, xattr_len of host inode is recalculated. ui->data_len is updated before computation and result is wrong. This patch adds a temporary variable to fix computation. To reproduce the issue: ~# > a.txt ~# attr -s an-attr -V a-value a.txt ~# attr -s an-attr -V a-bit-bigger-value a.txt Now host inode xattr_len is wrong. Forcing dbg_check_filesystem() generates the following error: [ 130.620140] UBIFS (ubi0:2): background thread "ubifs_bgt0_2" started, PID 565 [ 131.470790] UBIFS error (ubi0:2 pid 564): check_inodes: inode 646 has xattr size 240, but calculated size is 256 [ 131.481697] UBIFS (ubi0:2): dump of the inode 646 sitting in LEB 29:114688 [ 131.488953] magic 0x6101831 [ 131.492876] crc 0x9fce9091 [ 131.496836] node_type 0 (inode node) [ 131.501193] group_type 1 (in node group) [ 131.505788] sqnum 9278 [ 131.509191] len 160 [ 131.512549] key (646, inode) [ 131.516688] creat_sqnum 9270 [ 131.520133] size 0 [ 131.523264] nlink 1 [ 131.526398] atime 1053025857.0 [ 131.530574] mtime 1053025857.0 [ 131.534714] ctime 1053025906.0 [ 131.538849] uid 0 [ 131.542009] gid 0 [ 131.545140] mode 33188 [ 131.548636] flags 0x1 [ 131.551977] xattr_cnt 1 [ 131.555108] xattr_size 240 [ 131.558420] xattr_names 12 [ 131.561670] compr_type 0x1 [ 131.564983] data len 0 [ 131.568125] UBIFS error (ubi0:2 pid 564): dbg_check_filesystem: file-system check failed with error -22 [ 131.578074] CPU: 0 PID: 564 Comm: mount Not tainted 4.4.12-g3639bea54a #24 [ 131.585352] Hardware name: Generic AM33XX (Flattened Device Tree) [ 131.591918] [<c00151c0>] (unwind_backtrace) from [<c0012acc>] (show_stack+0x10/0x14) [ 131.600177] [<c0012acc>] (show_stack) from [<c01c950c>] (dbg_check_filesystem+0x464/0x4d0) [ 131.608934] [<c01c950c>] (dbg_check_filesystem) from [<c019f36c>] (ubifs_mount+0x14f8/0x2130) [ 131.617991] [<c019f36c>] (ubifs_mount) from [<c00d7088>] (mount_fs+0x14/0x98) [ 131.625572] [<c00d7088>] (mount_fs) from [<c00ed674>] (vfs_kern_mount+0x4c/0xd4) [ 131.633435] [<c00ed674>] (vfs_kern_mount) from [<c00efb5c>] (do_mount+0x988/0xb50) [ 131.641471] [<c00efb5c>] (do_mount) from [<c00f004c>] (SyS_mount+0x74/0xa0) [ 131.648837] [<c00f004c>] (SyS_mount) from [<c000fe20>] (ret_fast_syscall+0x0/0x3c) [ 131.665315] UBIFS (ubi0:2): background thread "ubifs_bgt0_2" stops Signed-off-by: Pascal Eberhard <pascal.eberhard@gmail.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2016-10-02ubifs: Use move variable in ubifs_rename()Richard Weinberger1-2/+2
...to make the code more consistent since we use move already in other places. Signed-off-by: Richard Weinberger <richard@nod.at>
2016-10-02ubifs: Implement RENAME_EXCHANGERichard Weinberger3-6/+204
Adds RENAME_EXCHANGE to UBIFS, the operation itself is completely disjunct from a regular rename() that's why we dispatch very early in ubifs_reaname(). RENAME_EXCHANGE used by the renameat2() system call allows the caller to exchange two paths atomically. Both paths have to exist and have to be on the same filesystem. Signed-off-by: Richard Weinberger <richard@nod.at>
2016-10-02ubifs: Implement RENAME_WHITEOUTRichard Weinberger3-33/+134
Adds RENAME_WHITEOUT support to UBIFS, we implement it in the same way as ext4 and xfs do. For an overview of other ways to implement it please refere to commit 7dcf5c3e4527 ("xfs: add RENAME_WHITEOUT support"). Signed-off-by: Richard Weinberger <richard@nod.at>
2016-10-02ubifs: Implement O_TMPFILERichard Weinberger1-0/+71
This patchs adds O_TMPFILE support to UBIFS. A temp file is a reference to an unlinked inode, a user holding the reference can use it. As soon it is being closed all data vanishes. Signed-off-by: Richard Weinberger <richard@nod.at>
2016-09-27fs: rename "rename2" i_op to "rename"Miklos Szeredi1-1/+1
Generated patch: sed -i "s/\.rename2\t/\.rename\t\t/" `git grep -wl rename2` sed -i "s/\brename2\b/rename/g" `git grep -wl rename2` Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
2016-09-27fs: support RENAME_NOREPLACE for local filesystemsMiklos Szeredi1-2/+6
This is trivial to do: - add flags argument to foo_rename() - check if flags doesn't have any other than RENAME_NOREPLACE - assign foo_rename() to .rename2 instead of .rename Filesystems converted: affs, bfs, exofs, ext2, hfs, hfsplus, jffs2, jfs, logfs, minix, msdos, nilfs2, omfs, reiserfs, sysvfs, ubifs, udf, ufs, vfat. Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> Acked-by: Boaz Harrosh <ooo@electrozaur.com> Acked-by: Richard Weinberger <richard@nod.at> Acked-by: Bob Copeland <me@bobcopeland.com> Acked-by: Jan Kara <jack@suse.cz> Cc: Theodore Ts'o <tytso@mit.edu> Cc: Jaegeuk Kim <jaegeuk@kernel.org> Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Cc: Mikulas Patocka <mpatocka@redhat.com> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Dave Kleikamp <shaggy@kernel.org> Cc: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Cc: Christoph Hellwig <hch@infradead.org>
2016-09-22fs: Give dentry to inode_change_ok() instead of inodeJan Kara1-1/+1
inode_change_ok() will be resposible for clearing capabilities and IMA extended attributes and as such will need dentry. Give it as an argument to inode_change_ok() instead of an inode. Also rename inode_change_ok() to setattr_prepare() to better relect that it does also some modifications in addition to checks. Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jan Kara <jack@suse.cz>
2016-08-23ubifs: Fix xattr generic handler usageRichard Weinberger1-1/+4
UBIFS uses full names to work with xattrs, therefore we have to use xattr_full_name() to obtain the xattr prefix as string. Cc: <stable@vger.kernel.org> Cc: Andreas Gruenbacher <agruenba@redhat.com> Fixes: 2b88fc21ca ("ubifs: Switch to generic xattr handlers") Signed-off-by: Richard Weinberger <richard@nod.at> Reviewed-by: Andreas Gruenbacher <agruenba@redhat.com> Tested-by: Dongsheng Yang <dongsheng081251@gmail.com>
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