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linux-next/fs/nilfs2/the_nilfs.h
Tejun Heo 5a0e3ad6af include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files.  percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.

percpu.h -> slab.h dependency is about to be removed.  Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability.  As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.

  http://userweb.kernel.org/~tj/misc/slabh-sweep.py

The script does the followings.

* Scan files for gfp and slab usages and update includes such that
  only the necessary includes are there.  ie. if only gfp is used,
  gfp.h, if slab is used, slab.h.

* When the script inserts a new include, it looks at the include
  blocks and try to put the new include such that its order conforms
  to its surrounding.  It's put in the include block which contains
  core kernel includes, in the same order that the rest are ordered -
  alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
  doesn't seem to be any matching order.

* If the script can't find a place to put a new include (mostly
  because the file doesn't have fitting include block), it prints out
  an error message indicating which .h file needs to be added to the
  file.

The conversion was done in the following steps.

1. The initial automatic conversion of all .c files updated slightly
   over 4000 files, deleting around 700 includes and adding ~480 gfp.h
   and ~3000 slab.h inclusions.  The script emitted errors for ~400
   files.

2. Each error was manually checked.  Some didn't need the inclusion,
   some needed manual addition while adding it to implementation .h or
   embedding .c file was more appropriate for others.  This step added
   inclusions to around 150 files.

3. The script was run again and the output was compared to the edits
   from #2 to make sure no file was left behind.

4. Several build tests were done and a couple of problems were fixed.
   e.g. lib/decompress_*.c used malloc/free() wrappers around slab
   APIs requiring slab.h to be added manually.

5. The script was run on all .h files but without automatically
   editing them as sprinkling gfp.h and slab.h inclusions around .h
   files could easily lead to inclusion dependency hell.  Most gfp.h
   inclusion directives were ignored as stuff from gfp.h was usually
   wildly available and often used in preprocessor macros.  Each
   slab.h inclusion directive was examined and added manually as
   necessary.

6. percpu.h was updated not to include slab.h.

7. Build test were done on the following configurations and failures
   were fixed.  CONFIG_GCOV_KERNEL was turned off for all tests (as my
   distributed build env didn't work with gcov compiles) and a few
   more options had to be turned off depending on archs to make things
   build (like ipr on powerpc/64 which failed due to missing writeq).

   * x86 and x86_64 UP and SMP allmodconfig and a custom test config.
   * powerpc and powerpc64 SMP allmodconfig
   * sparc and sparc64 SMP allmodconfig
   * ia64 SMP allmodconfig
   * s390 SMP allmodconfig
   * alpha SMP allmodconfig
   * um on x86_64 SMP allmodconfig

8. percpu.h modifications were reverted so that it could be applied as
   a separate patch and serve as bisection point.

Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.

Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-30 22:02:32 +09:00

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/*
* the_nilfs.h - the_nilfs shared structure.
*
* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Written by Ryusuke Konishi <ryusuke@osrg.net>
*
*/
#ifndef _THE_NILFS_H
#define _THE_NILFS_H
#include <linux/types.h>
#include <linux/buffer_head.h>
#include <linux/fs.h>
#include <linux/blkdev.h>
#include <linux/backing-dev.h>
#include <linux/slab.h>
#include "sb.h"
/* the_nilfs struct */
enum {
THE_NILFS_INIT = 0, /* Information from super_block is set */
THE_NILFS_LOADED, /* Roll-back/roll-forward has done and
the latest checkpoint was loaded */
THE_NILFS_DISCONTINUED, /* 'next' pointer chain has broken */
THE_NILFS_GC_RUNNING, /* gc process is running */
THE_NILFS_SB_DIRTY, /* super block is dirty */
};
/**
* struct the_nilfs - struct to supervise multiple nilfs mount points
* @ns_flags: flags
* @ns_count: reference count
* @ns_list: list head for nilfs_list
* @ns_bdev: block device
* @ns_bdi: backing dev info
* @ns_writer: back pointer to writable nilfs_sb_info
* @ns_sem: semaphore for shared states
* @ns_super_sem: semaphore for global operations across super block instances
* @ns_mount_mutex: mutex protecting mount process of nilfs
* @ns_writer_sem: semaphore protecting ns_writer attach/detach
* @ns_current: back pointer to current mount
* @ns_sbh: buffer heads of on-disk super blocks
* @ns_sbp: pointers to super block data
* @ns_sbwtime: previous write time of super blocks
* @ns_sbsize: size of valid data in super block
* @ns_supers: list of nilfs super block structs
* @ns_seg_seq: segment sequence counter
* @ns_segnum: index number of the latest full segment.
* @ns_nextnum: index number of the full segment index to be used next
* @ns_pseg_offset: offset of next partial segment in the current full segment
* @ns_cno: next checkpoint number
* @ns_ctime: write time of the last segment
* @ns_nongc_ctime: write time of the last segment not for cleaner operation
* @ns_ndirtyblks: Number of dirty data blocks
* @ns_last_segment_lock: lock protecting fields for the latest segment
* @ns_last_pseg: start block number of the latest segment
* @ns_last_seq: sequence value of the latest segment
* @ns_last_cno: checkpoint number of the latest segment
* @ns_prot_seq: least sequence number of segments which must not be reclaimed
* @ns_free_segments_count: counter of free segments
* @ns_segctor_sem: segment constructor semaphore
* @ns_dat: DAT file inode
* @ns_cpfile: checkpoint file inode
* @ns_sufile: segusage file inode
* @ns_gc_dat: shadow inode of the DAT file inode for GC
* @ns_gc_inodes: dummy inodes to keep live blocks
* @ns_gc_inodes_h: hash list to keep dummy inode holding live blocks
* @ns_blocksize_bits: bit length of block size
* @ns_nsegments: number of segments in filesystem
* @ns_blocks_per_segment: number of blocks per segment
* @ns_r_segments_percentage: reserved segments percentage
* @ns_nrsvsegs: number of reserved segments
* @ns_first_data_block: block number of first data block
* @ns_inode_size: size of on-disk inode
* @ns_first_ino: first not-special inode number
* @ns_crc_seed: seed value of CRC32 calculation
*/
struct the_nilfs {
unsigned long ns_flags;
atomic_t ns_count;
struct list_head ns_list;
struct block_device *ns_bdev;
struct backing_dev_info *ns_bdi;
struct nilfs_sb_info *ns_writer;
struct rw_semaphore ns_sem;
struct rw_semaphore ns_super_sem;
struct mutex ns_mount_mutex;
struct rw_semaphore ns_writer_sem;
/*
* components protected by ns_super_sem
*/
struct nilfs_sb_info *ns_current;
struct list_head ns_supers;
/*
* used for
* - loading the latest checkpoint exclusively.
* - allocating a new full segment.
* - protecting s_dirt in the super_block struct
* (see nilfs_write_super) and the following fields.
*/
struct buffer_head *ns_sbh[2];
struct nilfs_super_block *ns_sbp[2];
time_t ns_sbwtime[2];
unsigned ns_sbsize;
unsigned ns_mount_state;
/*
* Following fields are dedicated to a writable FS-instance.
* Except for the period seeking checkpoint, code outside the segment
* constructor must lock a segment semaphore while accessing these
* fields.
* The writable FS-instance is sole during a lifetime of the_nilfs.
*/
u64 ns_seg_seq;
__u64 ns_segnum;
__u64 ns_nextnum;
unsigned long ns_pseg_offset;
__u64 ns_cno;
time_t ns_ctime;
time_t ns_nongc_ctime;
atomic_t ns_ndirtyblks;
/*
* The following fields hold information on the latest partial segment
* written to disk with a super root. These fields are protected by
* ns_last_segment_lock.
*/
spinlock_t ns_last_segment_lock;
sector_t ns_last_pseg;
u64 ns_last_seq;
__u64 ns_last_cno;
u64 ns_prot_seq;
unsigned long ns_free_segments_count;
struct rw_semaphore ns_segctor_sem;
/*
* Following fields are lock free except for the period before
* the_nilfs is initialized.
*/
struct inode *ns_dat;
struct inode *ns_cpfile;
struct inode *ns_sufile;
struct inode *ns_gc_dat;
/* GC inode list and hash table head */
struct list_head ns_gc_inodes;
struct hlist_head *ns_gc_inodes_h;
/* Disk layout information (static) */
unsigned int ns_blocksize_bits;
unsigned long ns_nsegments;
unsigned long ns_blocks_per_segment;
unsigned long ns_r_segments_percentage;
unsigned long ns_nrsvsegs;
unsigned long ns_first_data_block;
int ns_inode_size;
int ns_first_ino;
u32 ns_crc_seed;
};
#define NILFS_GCINODE_HASH_BITS 8
#define NILFS_GCINODE_HASH_SIZE (1<<NILFS_GCINODE_HASH_BITS)
#define THE_NILFS_FNS(bit, name) \
static inline void set_nilfs_##name(struct the_nilfs *nilfs) \
{ \
set_bit(THE_NILFS_##bit, &(nilfs)->ns_flags); \
} \
static inline void clear_nilfs_##name(struct the_nilfs *nilfs) \
{ \
clear_bit(THE_NILFS_##bit, &(nilfs)->ns_flags); \
} \
static inline int nilfs_##name(struct the_nilfs *nilfs) \
{ \
return test_bit(THE_NILFS_##bit, &(nilfs)->ns_flags); \
}
THE_NILFS_FNS(INIT, init)
THE_NILFS_FNS(LOADED, loaded)
THE_NILFS_FNS(DISCONTINUED, discontinued)
THE_NILFS_FNS(GC_RUNNING, gc_running)
THE_NILFS_FNS(SB_DIRTY, sb_dirty)
/* Minimum interval of periodical update of superblocks (in seconds) */
#define NILFS_SB_FREQ 10
#define NILFS_ALTSB_FREQ 60 /* spare superblock */
static inline int nilfs_sb_need_update(struct the_nilfs *nilfs)
{
u64 t = get_seconds();
return t < nilfs->ns_sbwtime[0] ||
t > nilfs->ns_sbwtime[0] + NILFS_SB_FREQ;
}
static inline int nilfs_altsb_need_update(struct the_nilfs *nilfs)
{
u64 t = get_seconds();
struct nilfs_super_block **sbp = nilfs->ns_sbp;
return sbp[1] && t > nilfs->ns_sbwtime[1] + NILFS_ALTSB_FREQ;
}
void nilfs_set_last_segment(struct the_nilfs *, sector_t, u64, __u64);
struct the_nilfs *find_or_create_nilfs(struct block_device *);
void put_nilfs(struct the_nilfs *);
int init_nilfs(struct the_nilfs *, struct nilfs_sb_info *, char *);
int load_nilfs(struct the_nilfs *, struct nilfs_sb_info *);
int nilfs_discard_segments(struct the_nilfs *, __u64 *, size_t);
int nilfs_count_free_blocks(struct the_nilfs *, sector_t *);
struct nilfs_sb_info *nilfs_find_sbinfo(struct the_nilfs *, int, __u64);
int nilfs_checkpoint_is_mounted(struct the_nilfs *, __u64, int);
int nilfs_near_disk_full(struct the_nilfs *);
void nilfs_fall_back_super_block(struct the_nilfs *);
void nilfs_swap_super_block(struct the_nilfs *);
static inline void get_nilfs(struct the_nilfs *nilfs)
{
/* Caller must have at least one reference of the_nilfs. */
atomic_inc(&nilfs->ns_count);
}
static inline void
nilfs_attach_writer(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi)
{
down_write(&nilfs->ns_writer_sem);
nilfs->ns_writer = sbi;
up_write(&nilfs->ns_writer_sem);
}
static inline void
nilfs_detach_writer(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi)
{
down_write(&nilfs->ns_writer_sem);
if (sbi == nilfs->ns_writer)
nilfs->ns_writer = NULL;
up_write(&nilfs->ns_writer_sem);
}
static inline void nilfs_put_sbinfo(struct nilfs_sb_info *sbi)
{
if (atomic_dec_and_test(&sbi->s_count))
kfree(sbi);
}
static inline int nilfs_valid_fs(struct the_nilfs *nilfs)
{
unsigned valid_fs;
down_read(&nilfs->ns_sem);
valid_fs = (nilfs->ns_mount_state & NILFS_VALID_FS);
up_read(&nilfs->ns_sem);
return valid_fs;
}
static inline void
nilfs_get_segment_range(struct the_nilfs *nilfs, __u64 segnum,
sector_t *seg_start, sector_t *seg_end)
{
*seg_start = (sector_t)nilfs->ns_blocks_per_segment * segnum;
*seg_end = *seg_start + nilfs->ns_blocks_per_segment - 1;
if (segnum == 0)
*seg_start = nilfs->ns_first_data_block;
}
static inline sector_t
nilfs_get_segment_start_blocknr(struct the_nilfs *nilfs, __u64 segnum)
{
return (segnum == 0) ? nilfs->ns_first_data_block :
(sector_t)nilfs->ns_blocks_per_segment * segnum;
}
static inline __u64
nilfs_get_segnum_of_block(struct the_nilfs *nilfs, sector_t blocknr)
{
sector_t segnum = blocknr;
sector_div(segnum, nilfs->ns_blocks_per_segment);
return segnum;
}
static inline void
nilfs_terminate_segment(struct the_nilfs *nilfs, sector_t seg_start,
sector_t seg_end)
{
/* terminate the current full segment (used in case of I/O-error) */
nilfs->ns_pseg_offset = seg_end - seg_start + 1;
}
static inline void nilfs_shift_to_next_segment(struct the_nilfs *nilfs)
{
/* move forward with a full segment */
nilfs->ns_segnum = nilfs->ns_nextnum;
nilfs->ns_pseg_offset = 0;
nilfs->ns_seg_seq++;
}
static inline __u64 nilfs_last_cno(struct the_nilfs *nilfs)
{
__u64 cno;
spin_lock(&nilfs->ns_last_segment_lock);
cno = nilfs->ns_last_cno;
spin_unlock(&nilfs->ns_last_segment_lock);
return cno;
}
static inline int nilfs_segment_is_active(struct the_nilfs *nilfs, __u64 n)
{
return n == nilfs->ns_segnum || n == nilfs->ns_nextnum;
}
#endif /* _THE_NILFS_H */
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