[PATCH 00/24] nilfs2: introduce debugging subsystem implementation

[Vyacheslav Dubeyko <slava-yeENwD64cLxBDgjK7y7TUQ@public.gmane.org>]

Hi,

This patch set implements debugging subsystem in NILFS2 driver.

The debugging subsystem includes:
(1) debugging subsystem API;
(2) subsystems and printing opportunity flags;
(3) kernel configuration options.

The debugging subsystem API includes:
(1) nilfs2_debug() method.
    It is a basic debugging method. It expects a set of
    flags, format string and variable arguments list.

(2) nilfs2_hexdump() method.
    It is a method for writing in system log hexdumps
    of internal structures. It expects a set of flags,
    prefix string, pointer on memory and size of pointed data.

(3) NILFS_ERR_DBG() macros.
    It is a macros that prints out file name, line number,
    function name and error code.

Every module of NILFS2 driver has dedicated flag. These flags
give opportunity to enable debugging output only from required
modules of NILFS2 driver. There are several special output
flags:
(1) DBG_SHOW_ERR flag.
    This flag requests writing in system log messages about
    internal errors of NILFS2 driver.

(2) DBG_DUMP_STACK flag.
    This flag requests output of dump stack.

(3) DBG_SPAM flag.
    This flag requsts output from frequently called functions
    or detailed debugging output from function's body.

(4) DBG_HEX_DUMP flag.
    This flag requests writing in system log hexdumps of internal
    structures.

The debugging subsystem of NILFS2 driver has DBG_MASK that defines
set of flags for debugging output. Namely, this mask is used for
comparing requested flag with set of flags that should be printed out.
Such selection mechanism is used for the case of printk() calls.

Also, it is available opportunity of dynamic debugging by means of
pr_debug() method using. In such case the behaviour of pr_debug() is
controlled via writing to a control file in the 'debugfs' filesystem.

The debugging subsystem is configured by means of kernel
configuration options:
(1) NILFS2_USE_PR_DEBUG
    This option enables using of pr_debug() instead of printk() and
    print_hex_dump_bytes() instead of print_hex_dump().

(2) NILFS2_DEBUG_SHOW_ERRORS
    This option enables writing in system log messages about internal
    errors of NILFS2 driver.

(3) NILFS2_DEBUG_DUMP_STACK
    This option enables output of dump stack. Usually, every
    function in NILFS2 driver begins from debugging output of
    function name, file, line and input arguments' value.
    In the case of enabling this option debugging output
    will include dump stack too.

(4) NILFS2_DEBUG_SHOW_SPAM
    This option enables output from frequently called functions or
    detailed debugging output from function's body.

(5) NILFS2_DEBUG_HEXDUMP
    This option enables writing in system log hexdumps of internal
    structures.

(6) NILFS2_DEBUG_BASE_OPERATIONS
    This option enables base operations subsystem debugging output.

(7) NILFS2_DEBUG_MDT_FILES
    This option enables metadata (MDT) files subsystem debugging output.

(8) NILFS2_DEBUG_SEGMENTS_SUBSYSTEM
    This option enables segments subsystem debugging output.

(9) NILFS2_DEBUG_GC_SUBSYSTEM
    This option enables GC subsystem debugging output.

(10) NILFS2_DEBUG_RECOVERY_SUBSYSTEM
     This option enables recovery subsystem debugging output.

(11) NILFS2_DEBUG_BLOCK_MAPPING
     This option enables block mapping subsystem debugging output.

(12) NILFS2_DEBUG_BUFFER_MANAGEMENT
     This option enables buffer/page management subsystem debugging
     output.

With the best regards,
Vyacheslav Dubeyko.
---
 Vyacheslav Dubeyko (1):
    nilfs2: introduce debugging subsystem implementation

 fs/nilfs2/Kconfig     |  145 +++++++++++++
 fs/nilfs2/alloc.c     |  140 +++++++++++--
 fs/nilfs2/bmap.c      |  109 +++++++++-
 fs/nilfs2/btnode.c    |   45 +++-
 fs/nilfs2/btree.c     |  515 +++++++++++++++++++++++++++++++++++++++++-----
 fs/nilfs2/cpfile.c    |  204 +++++++++++++++----
 fs/nilfs2/dat.c       |  130 ++++++++++--
 fs/nilfs2/debug.h     |  291 ++++++++++++++++++++++++++
 fs/nilfs2/dir.c       |   71 ++++++-
 fs/nilfs2/direct.c    |  117 +++++++++--
 fs/nilfs2/file.c      |   29 ++-
 fs/nilfs2/gcinode.c   |   23 ++-
 fs/nilfs2/ifile.c     |   55 ++++-
 fs/nilfs2/inode.c     |  271 +++++++++++++++++++++----
 fs/nilfs2/ioctl.c     |  275 +++++++++++++++++++------
 fs/nilfs2/mdt.c       |  128 +++++++++---
 fs/nilfs2/namei.c     |  183 +++++++++++++----
 fs/nilfs2/nilfs.h     |    1 +
 fs/nilfs2/page.c      |   52 ++++-
 fs/nilfs2/recovery.c  |  160 ++++++++++++---
 fs/nilfs2/segbuf.c    |   90 +++++++-
 fs/nilfs2/segment.c   |  541 +++++++++++++++++++++++++++++++++++++++++++------
 fs/nilfs2/sufile.c    |  172 +++++++++++++---
 fs/nilfs2/super.c     |  192 ++++++++++++++----
 fs/nilfs2/the_nilfs.c |  130 +++++++++---
 25 files changed, 3537 insertions(+), 532 deletions(-)
--
1.7.9.5



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