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Currently, HFS/HFS+ has very obsolete and inconvenient debug output subsystem. Also, the code is duplicated in HFS and HFS+ driver. This patch introduces linux/hfs_common.h for gathering common declarations, inline functions, and common short methods. Currently, this file contains only hfs_dbg() function that employs pr_debug() with the goal to print a debug-level messages conditionally. So, now, it is possible to enable the debug output by means of: echo 'file extent.c +p' > /proc/dynamic_debug/control echo 'func hfsplus_evict_inode +p' > /proc/dynamic_debug/control And debug output looks like this: hfs: pid 5831:fs/hfs/catalog.c:228 hfs_cat_delete(): delete_cat: 00,48 hfs: pid 5831:fs/hfs/extent.c:484 hfs_file_truncate(): truncate: 48, 409600 -> 0 hfs: pid 5831:fs/hfs/extent.c:212 hfs_dump_extent(): hfs: pid 5831:fs/hfs/extent.c:214 hfs_dump_extent(): 78:4 hfs: pid 5831:fs/hfs/extent.c:214 hfs_dump_extent(): 0:0 hfs: pid 5831:fs/hfs/extent.c:214 hfs_dump_extent(): 0:0 v4 Debug messages have been reworked and information about new HFS/HFS+ shared declarations file has been added to MAINTAINERS file. v5 Yangtao Li suggested to clean up debug output and fix several typos. Signed-off-by: Viacheslav Dubeyko <slava@dubeyko.com> cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> cc: Yangtao Li <frank.li@vivo.com> cc: linux-fsdevel@vger.kernel.org cc: Johannes Thumshirn <Johannes.Thumshirn@wdc.com> Signed-off-by: Viacheslav Dubeyko <slava@dubeyko.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.