1. 02 Nov, 2017 1 commit
    • Greg Kroah-Hartman's avatar
      License cleanup: add SPDX GPL-2.0 license identifier to files with no license · b2441318
      Greg Kroah-Hartman authored
      Many source files in the tree are missing licensing information, which
      makes it harder for compliance tools to determine the correct license.
      
      By default all files without license information are under the default
      license of the kernel, which is GPL version 2.
      
      Update the files which contain no license information with the 'GPL-2.0'
      SPDX license identifier.  The SPDX identifier is a legally binding
      shorthand, which can be used instead of the full boiler plate text.
      
      This patch is based on work done by Thomas Gleixner and Kate Stewart and
      Philippe Ombredanne.
      
      How this work was done:
      
      Patches were generated and checked against linux-4.14-rc6 for a subset of
      the use cases:
       - file had no licensing information it it.
       - file was a */uapi/* one with no licensing information in it,
       - file was a */uapi/* one with existing licensing information,
      
      Further patches will be generated in subsequent months to fix up cases
      where non-standard license headers were used, and references to license
      had to be inferred by heuristics based on keywords.
      
      The analysis to determine which SPDX License Identifier to be applied to
      a file was done in a spreadsheet of side by side results from of the
      output of two independent scanners (ScanCode & Windriver) producing SPDX
      tag:value files created by Philippe Ombredanne.  Philippe prepared the
      base worksheet, and did an initial spot review of a few 1000 files.
      
      The 4.13 kernel was the starting point of the analysis with 60,537 files
      assessed.  Kate Stewart did a file by file comparison of the scanner
      results in the spreadsheet to determine which SPDX license identifier(s)
      to be applied to the file. She confirmed any determination that was not
      immediately clear with lawyers working with the Linux Foundation.
      
      Criteria used to select files for SPDX license identifier tagging was:
       - Files considered eligible had to be source code files.
       - Make and config files were included as candidates if they contained >5
         lines of source
       - File already had some variant of a license header in it (even if <5
         lines).
      
      All documentation files were explicitly excluded.
      
      The following heuristics were used to determine which SPDX license
      identifiers to apply.
      
       - when both scanners couldn't find any license traces, file was
         considered to have no license information in it, and the top level
         COPYING file license applied.
      
         For non */uapi/* files that summary was:
      
         SPDX license identifier                            # files
         ---------------------------------------------------|-------
         GPL-2.0                                              11139
      
         and resulted in the first patch in this series.
      
         If that file was a */uapi/* path one, it was "GPL-2.0 WITH
         Linux-syscall-note" otherwise it was "GPL-2.0".  Results of that was:
      
         SPDX license identifier                            # files
         ---------------------------------------------------|-------
         GPL-2.0 WITH Linux-syscall-note                        930
      
         and resulted in the second patch in this series.
      
       - if a file had some form of licensing information in it, and was one
         of the */uapi/* ones, it was denoted with the Linux-syscall-note if
         any GPL family license was found in the file or had no licensing in
         it (per prior point).  Results summary:
      
         SPDX license identifier                            # files
         ---------------------------------------------------|------
         GPL-2.0 WITH Linux-syscall-note                       270
         GPL-2.0+ WITH Linux-syscall-note                      169
         ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause)    21
         ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)    17
         LGPL-2.1+ WITH Linux-syscall-note                      15
         GPL-1.0+ WITH Linux-syscall-note                       14
         ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause)    5
         LGPL-2.0+ WITH Linux-syscall-note                       4
         LGPL-2.1 WITH Linux-syscall-note                        3
         ((GPL-2.0 WITH Linux-syscall-note) OR MIT)              3
         ((GPL-2.0 WITH Linux-syscall-note) AND MIT)             1
      
         and that resulted in the third patch in this series.
      
       - when the two scanners agreed on the detected license(s), that became
         the concluded license(s).
      
       - when there was disagreement between the two scanners (one detected a
         license but the other didn't, or they both detected different
         licenses) a manual inspection of the file occurred.
      
       - In most cases a manual inspection of the information in the file
         resulted in a clear resolution of the license that should apply (and
         which scanner probably needed to revisit its heuristics).
      
       - When it was not immediately clear, the license identifier was
         confirmed with lawyers working with the Linux Foundation.
      
       - If there was any question as to the appropriate license identifier,
         the file was flagged for further research and to be revisited later
         in time.
      
      In total, over 70 hours of logged manual review was done on the
      spreadsheet to determine the SPDX license identifiers to apply to the
      source files by Kate, Philippe, Thomas and, in some cases, confirmation
      by lawyers working with the Linux Foundation.
      
      Kate also obtained a third independent scan of the 4.13 code base from
      FOSSology, and compared selected files where the other two scanners
      disagreed against that SPDX file, to see if there was new insights.  The
      Windriver scanner is based on an older version of FOSSology in part, so
      they are related.
      
      Thomas did random spot checks in about 500 files from the spreadsheets
      for the uapi headers and agreed with SPDX license identifier in the
      files he inspected. For the non-uapi files Thomas did random spot checks
      in about 15000 files.
      
      In initial set of patches against 4.14-rc6, 3 files were found to have
      copy/paste license identifier errors, and have been fixed to reflect the
      correct identifier.
      
      Additionally Philippe spent 10 hours this week doing a detailed manual
      inspection and review of the 12,461 patched files from the initial patch
      version early this week with:
       - a full scancode scan run, collecting the matched texts, detected
         license ids and scores
       - reviewing anything where there was a license detected (about 500+
         files) to ensure that the applied SPDX license was correct
       - reviewing anything where there was no detection but the patch license
         was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
         SPDX license was correct
      
      This produced a worksheet with 20 files needing minor correction.  This
      worksheet was then exported into 3 different .csv files for the
      different types of files to be modified.
      
      These .csv files were then reviewed by Greg.  Thomas wrote a script to
      parse the csv files and add the proper SPDX tag to the file, in the
      format that the file expected.  This script was further refined by Greg
      based on the output to detect more types of files automatically and to
      distinguish between header and source .c files (which need different
      comment types.)  Finally Greg ran the script using the .csv files to
      generate the patches.
      Reviewed-by: default avatarKate Stewart <kstewart@linuxfoundation.org>
      Reviewed-by: default avatarPhilippe Ombredanne <pombredanne@nexb.com>
      Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      b2441318
  2. 01 Oct, 2017 1 commit
  3. 31 Aug, 2017 1 commit
  4. 13 Jul, 2017 1 commit
  5. 14 May, 2017 1 commit
    • Dan Williams's avatar
      dax, xfs, ext4: compile out iomap-dax paths in the FS_DAX=n case · f5705aa8
      Dan Williams authored
      Tetsuo reports:
      
        fs/built-in.o: In function `xfs_file_iomap_end':
        xfs_iomap.c:(.text+0xe0ef9): undefined reference to `put_dax'
        fs/built-in.o: In function `xfs_file_iomap_begin':
        xfs_iomap.c:(.text+0xe1a7f): undefined reference to `dax_get_by_host'
        make: *** [vmlinux] Error 1
        $ grep DAX .config
        CONFIG_DAX=m
        # CONFIG_DEV_DAX is not set
        # CONFIG_FS_DAX is not set
      
      When FS_DAX=n we can/must throw away the dax code in filesystems.
      Implement 'fs_' versions of dax_get_by_host() and put_dax() that are
      nops in the FS_DAX=n case.
      
      Cc: <linux-xfs@vger.kernel.org>
      Cc: <linux-ext4@vger.kernel.org>
      Cc: Jan Kara <jack@suse.com>
      Cc: "Theodore Ts'o" <tytso@mit.edu>
      Cc: "Darrick J. Wong" <darrick.wong@oracle.com>
      Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
      Tested-by: default avatarTony Luck <tony.luck@intel.com>
      Fixes: ef510424 ("block, dax: move 'select DAX' from BLOCK to FS_DAX")
      Reported-by: default avatarTetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
      Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
      f5705aa8
  6. 25 Apr, 2017 1 commit
  7. 19 Apr, 2017 1 commit
  8. 05 Apr, 2017 1 commit
    • Jan Kara's avatar
      ext2: Call dquot_writeback_dquots() with s_umount held · 65547661
      Jan Kara authored
      ext2_sync_fs() could be called without s_umount semaphore held when
      called through ext2_write_super() from __ext2_write_inode(). This
      function then calls dquot_writeback_dquots() which relies on s_umount to
      be held for protection against other quota operations.
      
      In fact __ext2_write_inode() does not need all the functionality
      ext2_write_super() provides. It is enough to just write the superblock.
      So use ext2_sync_super() instead.
      
      Fixes: 9d1ccbe7Reported-by: default avatarJan Beulich <jbeulich@suse.com>
      Signed-off-by: default avatarJan Kara <jack@suse.cz>
      65547661
  9. 31 Jan, 2017 1 commit
  10. 27 Dec, 2016 1 commit
  11. 07 Dec, 2016 1 commit
  12. 21 Nov, 2016 1 commit
  13. 04 Nov, 2016 1 commit
  14. 18 Oct, 2016 1 commit
    • Arnd Bergmann's avatar
      ext2: avoid bogus -Wmaybe-uninitialized warning · e952813e
      Arnd Bergmann authored
      On ARM, we get this false-positive warning since the rework of
      the ext2_get_blocks interface:
      
      fs/ext2/inode.c: In function 'ext2_get_block':
      include/linux/buffer_head.h:340:16: error: 'bno' may be used uninitialized in this function [-Werror=maybe-uninitialized]
      
      The calling conventions for this function are rather complex, and it's
      not surprising that the compiler gets this wrong, I spent a long time
      trying to understand how it all fits together myself.
      
      This change to avoid the warning makes sure the compiler sees that we
      always set 'bno' pointer whenever we have a positive return code.
      The transformation is correct because we always arrive at the 'got_it'
      label with a positive count that gets used as the return value, while
      any branch to the 'cleanup' label has a negative or zero 'err'.
      
      Fixes: 6750ad71 ("ext2: stop passing buffer_head to ext2_get_blocks")
      Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
      Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
      Cc: Dave Chinner <david@fromorbit.com>
      Signed-off-by: default avatarJan Kara <jack@suse.cz>
      e952813e
  15. 02 Oct, 2016 1 commit
  16. 28 Sep, 2016 1 commit
  17. 27 Sep, 2016 1 commit
  18. 22 Sep, 2016 1 commit
  19. 19 Sep, 2016 2 commits
  20. 06 Jul, 2016 1 commit
    • Carlos Maiolino's avatar
      ext2: fix filesystem deadlock while reading corrupted xattr block · ff0031d8
      Carlos Maiolino authored
      This bug can be reproducible with fsfuzzer, although, I couldn't reproduce it
      100% of my tries, it is quite easily reproducible.
      
      During the deletion of an inode, ext2_xattr_delete_inode() does not check if the
      block pointed by EXT2_I(inode)->i_file_acl is a valid data block, this might
      lead to a deadlock, when i_file_acl == 1, and the filesystem block size is 1024.
      
      In that situation, ext2_xattr_delete_inode, will load the superblock's buffer
      head (instead of a valid i_file_acl block), and then lock that buffer head,
      which, ext2_sync_super will also try to lock, making the filesystem deadlock in
      the following stack trace:
      
      root     17180  0.0  0.0 113660   660 pts/0    D+   07:08   0:00 rmdir
      /media/test/dir1
      
      [<ffffffff8125da9f>] __sync_dirty_buffer+0xaf/0x100
      [<ffffffff8125db03>] sync_dirty_buffer+0x13/0x20
      [<ffffffffa03f0d57>] ext2_sync_super+0xb7/0xc0 [ext2]
      [<ffffffffa03f10b9>] ext2_error+0x119/0x130 [ext2]
      [<ffffffffa03e9d93>] ext2_free_blocks+0x83/0x350 [ext2]
      [<ffffffffa03f3d03>] ext2_xattr_delete_inode+0x173/0x190 [ext2]
      [<ffffffffa03ee9e9>] ext2_evict_inode+0xc9/0x130 [ext2]
      [<ffffffff8123fd23>] evict+0xb3/0x180
      [<ffffffff81240008>] iput+0x1b8/0x240
      [<ffffffff8123c4ac>] d_delete+0x11c/0x150
      [<ffffffff8122fa7e>] vfs_rmdir+0xfe/0x120
      [<ffffffff812340ee>] do_rmdir+0x17e/0x1f0
      [<ffffffff81234dd6>] SyS_rmdir+0x16/0x20
      [<ffffffff81838cf2>] entry_SYSCALL_64_fastpath+0x1a/0xa4
      [<ffffffffffffffff>] 0xffffffffffffffff
      
      Fix this by using the same approach ext4 uses to test data blocks validity,
      implementing ext2_data_block_valid.
      
      An another possibility when the superblock is very corrupted, is that i_file_acl
      is 1, block_count is 1 and first_data_block is 0. For such situations, we might
      have i_file_acl pointing to a 'valid' block, but still step over the superblock.
      The approach I used was to also test if the superblock is not in the range
      described by ext2_data_block_valid() arguments
      Signed-off-by: default avatarCarlos Maiolino <cmaiolino@redhat.com>
      Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
      ff0031d8
  21. 18 May, 2016 1 commit
  22. 17 May, 2016 2 commits
  23. 01 May, 2016 1 commit
  24. 27 Feb, 2016 3 commits
    • Ross Zwisler's avatar
      dax: move writeback calls into the filesystems · 7f6d5b52
      Ross Zwisler authored
      Previously calls to dax_writeback_mapping_range() for all DAX filesystems
      (ext2, ext4 & xfs) were centralized in filemap_write_and_wait_range().
      
      dax_writeback_mapping_range() needs a struct block_device, and it used
      to get that from inode->i_sb->s_bdev.  This is correct for normal inodes
      mounted on ext2, ext4 and XFS filesystems, but is incorrect for DAX raw
      block devices and for XFS real-time files.
      
      Instead, call dax_writeback_mapping_range() directly from the filesystem
      ->writepages function so that it can supply us with a valid block
      device.  This also fixes DAX code to properly flush caches in response
      to sync(2).
      Signed-off-by: default avatarRoss Zwisler <ross.zwisler@linux.intel.com>
      Signed-off-by: default avatarJan Kara <jack@suse.cz>
      Cc: Al Viro <viro@ftp.linux.org.uk>
      Cc: Dan Williams <dan.j.williams@intel.com>
      Cc: Dave Chinner <david@fromorbit.com>
      Cc: Jens Axboe <axboe@fb.com>
      Cc: Matthew Wilcox <matthew.r.wilcox@intel.com>
      Cc: Theodore Ts'o <tytso@mit.edu>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      7f6d5b52
    • Ross Zwisler's avatar
      dax: give DAX clearing code correct bdev · 20a90f58
      Ross Zwisler authored
      dax_clear_blocks() needs a valid struct block_device and previously it
      was using inode->i_sb->s_bdev in all cases.  This is correct for normal
      inodes on mounted ext2, ext4 and XFS filesystems, but is incorrect for
      DAX raw block devices and for XFS real-time devices.
      
      Instead, rename dax_clear_blocks() to dax_clear_sectors(), and change
      its arguments to take a bdev and a sector instead of an inode and a
      block.  This better reflects what the function does, and it allows the
      filesystem and raw block device code to pass in an appropriate struct
      block_device.
      Signed-off-by: default avatarRoss Zwisler <ross.zwisler@linux.intel.com>
      Suggested-by: default avatarDan Williams <dan.j.williams@intel.com>
      Reviewed-by: default avatarJan Kara <jack@suse.cz>
      Cc: Theodore Ts'o <tytso@mit.edu>
      Cc: Al Viro <viro@ftp.linux.org.uk>
      Cc: Dave Chinner <david@fromorbit.com>
      Cc: Jens Axboe <axboe@fb.com>
      Cc: Matthew Wilcox <matthew.r.wilcox@intel.com>
      Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
      Cc: Theodore Ts'o <tytso@mit.edu>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      20a90f58
    • Ross Zwisler's avatar
      ext2, ext4: only set S_DAX for regular inodes · 0a6cf913
      Ross Zwisler authored
      When S_DAX is set on an inode we assume that if there are pages attached
      to the mapping (mapping->nrpages != 0), those pages are clean zero pages
      that were used to service reads from holes.  Any dirty data associated
      with the inode should be in the form of DAX exceptional entries
      (mapping->nrexceptional) that is written back via
      dax_writeback_mapping_range().
      
      With the current code, though, this isn't always true.  For example,
      ext2 and ext4 directory inodes can have S_DAX set, but have their dirty
      data stored as dirty page cache entries.  For these types of inodes,
      having S_DAX set doesn't really make sense since their I/O doesn't
      actually happen through the DAX code path.
      
      Instead, only allow S_DAX to be set for regular inodes for ext2 and
      ext4.  This allows us to have strict DAX vs non-DAX paths in the
      writeback code.
      Signed-off-by: default avatarRoss Zwisler <ross.zwisler@linux.intel.com>
      Reviewed-by: default avatarJan Kara <jack@suse.cz>
      Cc: Theodore Ts'o <tytso@mit.edu>
      Cc: Al Viro <viro@ftp.linux.org.uk>
      Cc: Dan Williams <dan.j.williams@intel.com>
      Cc: Dave Chinner <david@fromorbit.com>
      Cc: Jens Axboe <axboe@fb.com>
      Cc: Matthew Wilcox <matthew.r.wilcox@intel.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      0a6cf913
  25. 09 Dec, 2015 1 commit
    • Al Viro's avatar
      don't put symlink bodies in pagecache into highmem · 21fc61c7
      Al Viro authored
      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: default avatarAl Viro <viro@zeniv.linux.org.uk>
      21fc61c7
  26. 19 Oct, 2015 1 commit
    • Ross Zwisler's avatar
      ext2: Add locking for DAX faults · 5726b27b
      Ross Zwisler authored
      Add locking to ensure that DAX faults are isolated from ext2 operations
      that modify the data blocks allocation for an inode.  This is intended to
      be analogous to the work being done in XFS by Dave Chinner:
      
      http://www.spinics.net/lists/linux-fsdevel/msg90260.html
      
      Compared with XFS the ext2 case is greatly simplified by the fact that ext2
      already allocates and zeros new blocks before they are returned as part of
      ext2_get_block(), so DAX doesn't need to worry about getting unmapped or
      unwritten buffer heads.
      
      This means that the only work we need to do in ext2 is to isolate the DAX
      faults from inode block allocation changes.  I believe this just means that
      we need to isolate the DAX faults from truncate operations.
      
      The newly introduced dax_sem is intended to replicate the protection
      offered by i_mmaplock in XFS.  In addition to truncate the i_mmaplock also
      protects XFS operations like hole punching, fallocate down, extent
      manipulation IOCTLS like xfs_ioc_space() and extent swapping.  Truncate is
      the only one of these operations supported by ext2.
      Signed-off-by: default avatarRoss Zwisler <ross.zwisler@linux.intel.com>
      Signed-off-by: default avatarJan Kara <jack@suse.com>
      5726b27b
  27. 08 Sep, 2015 1 commit
    • Matthew Wilcox's avatar
      dax: move DAX-related functions to a new header · c94c2acf
      Matthew Wilcox authored
      In order to handle the !CONFIG_TRANSPARENT_HUGEPAGES case, we need to
      return VM_FAULT_FALLBACK from the inlined dax_pmd_fault(), which is
      defined in linux/mm.h.  Given that we don't want to include <linux/mm.h>
      in <linux/fs.h>, the easiest solution is to move the DAX-related
      functions to a new header, <linux/dax.h>.  We could also have moved
      VM_FAULT_* definitions to a new header, or a different header that isn't
      quite such a boil-the-ocean header as <linux/mm.h>, but this felt like
      the best option.
      Signed-off-by: default avatarMatthew Wilcox <willy@linux.intel.com>
      Cc: Hillf Danton <dhillf@gmail.com>
      Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
      Cc: Theodore Ts'o <tytso@mit.edu>
      Cc: Jan Kara <jack@suse.cz>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      c94c2acf
  28. 23 Jul, 2015 1 commit
  29. 11 May, 2015 1 commit
  30. 15 Apr, 2015 2 commits
  31. 12 Apr, 2015 4 commits
  32. 26 Mar, 2015 1 commit