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alistair23-linux/fs/hpfs/hpfs_fn.h
Josef Bacik 02c24a8218 fs: push i_mutex and filemap_write_and_wait down into ->fsync() handlers 
Btrfs needs to be able to control how filemap_write_and_wait_range() is called
in fsync to make it less of a painful operation, so push down taking i_mutex and
the calling of filemap_write_and_wait() down into the ->fsync() handlers.  Some
file systems can drop taking the i_mutex altogether it seems, like ext3 and
ocfs2.  For correctness sake I just pushed everything down in all cases to make
sure that we keep the current behavior the same for everybody, and then each
individual fs maintainer can make up their mind about what to do from there.
Thanks,

Acked-by: Jan Kara <jack@suse.cz>
Signed-off-by: Josef Bacik <josef@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2011-07-20 20:47:59 -04:00

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/*
* linux/fs/hpfs/hpfs_fn.h
*
* Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
*
* function headers
*/
//#define DBG
//#define DEBUG_LOCKS
#include <linux/mutex.h>
#include <linux/pagemap.h>
#include <linux/buffer_head.h>
#include <linux/slab.h>
#include <asm/unaligned.h>
#include "hpfs.h"
#define EIOERROR EIO
#define EFSERROR EPERM
#define EMEMERROR ENOMEM
#define ANODE_ALLOC_FWD 512
#define FNODE_ALLOC_FWD 0
#define ALLOC_FWD_MIN 16
#define ALLOC_FWD_MAX 128
#define ALLOC_M 1
#define FNODE_RD_AHEAD 16
#define ANODE_RD_AHEAD 16
#define DNODE_RD_AHEAD 4
#define FREE_DNODES_ADD 58
#define FREE_DNODES_DEL 29
#define CHKCOND(x,y) if (!(x)) printk y
#ifdef DBG
#define PRINTK(x) printk x
#else
#undef PRINTK
#define PRINTK(x)
#endif
struct hpfs_inode_info {
loff_t mmu_private;
ino_t i_parent_dir; /* (directories) gives fnode of parent dir */
unsigned i_dno; /* (directories) root dnode */
unsigned i_dpos; /* (directories) temp for readdir */
unsigned i_dsubdno; /* (directories) temp for readdir */
unsigned i_file_sec; /* (files) minimalist cache of alloc info */
unsigned i_disk_sec; /* (files) minimalist cache of alloc info */
unsigned i_n_secs; /* (files) minimalist cache of alloc info */
unsigned i_ea_size; /* size of extended attributes */
unsigned i_ea_mode : 1; /* file's permission is stored in ea */
unsigned i_ea_uid : 1; /* file's uid is stored in ea */
unsigned i_ea_gid : 1; /* file's gid is stored in ea */
unsigned i_dirty : 1;
loff_t **i_rddir_off;
struct inode vfs_inode;
};
struct hpfs_sb_info {
struct mutex hpfs_mutex; /* global hpfs lock */
ino_t sb_root; /* inode number of root dir */
unsigned sb_fs_size; /* file system size, sectors */
unsigned sb_bitmaps; /* sector number of bitmap list */
unsigned sb_dirband_start; /* directory band start sector */
unsigned sb_dirband_size; /* directory band size, dnodes */
unsigned sb_dmap; /* sector number of dnode bit map */
unsigned sb_n_free; /* free blocks for statfs, or -1 */
unsigned sb_n_free_dnodes; /* free dnodes for statfs, or -1 */
uid_t sb_uid; /* uid from mount options */
gid_t sb_gid; /* gid from mount options */
umode_t sb_mode; /* mode from mount options */
unsigned sb_eas : 2; /* eas: 0-ignore, 1-ro, 2-rw */
unsigned sb_err : 2; /* on errs: 0-cont, 1-ro, 2-panic */
unsigned sb_chk : 2; /* checks: 0-no, 1-normal, 2-strict */
unsigned sb_lowercase : 1; /* downcase filenames hackery */
unsigned sb_was_error : 1; /* there was an error, set dirty flag */
unsigned sb_chkdsk : 2; /* chkdsk: 0-no, 1-on errs, 2-allways */
unsigned char *sb_cp_table; /* code page tables: */
/* 128 bytes uppercasing table & */
/* 128 bytes lowercasing table */
unsigned *sb_bmp_dir; /* main bitmap directory */
unsigned sb_c_bitmap; /* current bitmap */
unsigned sb_max_fwd_alloc; /* max forwad allocation */
int sb_timeshift;
};
/* Four 512-byte buffers and the 2k block obtained by concatenating them */
struct quad_buffer_head {
struct buffer_head *bh[4];
void *data;
};
/* The b-tree down pointer from a dir entry */
static inline dnode_secno de_down_pointer (struct hpfs_dirent *de)
{
CHKCOND(de->down,("HPFS: de_down_pointer: !de->down\n"));
return le32_to_cpu(*(dnode_secno *) ((void *) de + le16_to_cpu(de->length) - 4));
}
/* The first dir entry in a dnode */
static inline struct hpfs_dirent *dnode_first_de (struct dnode *dnode)
{
return (void *) dnode->dirent;
}
/* The end+1 of the dir entries */
static inline struct hpfs_dirent *dnode_end_de (struct dnode *dnode)
{
CHKCOND(le32_to_cpu(dnode->first_free)>=0x14 && le32_to_cpu(dnode->first_free)<=0xa00,("HPFS: dnode_end_de: dnode->first_free = %x\n",(unsigned)le32_to_cpu(dnode->first_free)));
return (void *) dnode + le32_to_cpu(dnode->first_free);
}
/* The dir entry after dir entry de */
static inline struct hpfs_dirent *de_next_de (struct hpfs_dirent *de)
{
CHKCOND(le16_to_cpu(de->length)>=0x20 && le16_to_cpu(de->length)<0x800,("HPFS: de_next_de: de->length = %x\n",(unsigned)le16_to_cpu(de->length)));
return (void *) de + le16_to_cpu(de->length);
}
static inline struct extended_attribute *fnode_ea(struct fnode *fnode)
{
return (struct extended_attribute *)((char *)fnode + le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s));
}
static inline struct extended_attribute *fnode_end_ea(struct fnode *fnode)
{
return (struct extended_attribute *)((char *)fnode + le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s) + le16_to_cpu(fnode->ea_size_s));
}
static unsigned ea_valuelen(struct extended_attribute *ea)
{
return ea->valuelen_lo + 256 * ea->valuelen_hi;
}
static inline struct extended_attribute *next_ea(struct extended_attribute *ea)
{
return (struct extended_attribute *)((char *)ea + 5 + ea->namelen + ea_valuelen(ea));
}
static inline secno ea_sec(struct extended_attribute *ea)
{
return le32_to_cpu(get_unaligned((secno *)((char *)ea + 9 + ea->namelen)));
}
static inline secno ea_len(struct extended_attribute *ea)
{
return le32_to_cpu(get_unaligned((secno *)((char *)ea + 5 + ea->namelen)));
}
static inline char *ea_data(struct extended_attribute *ea)
{
return (char *)((char *)ea + 5 + ea->namelen);
}
static inline unsigned de_size(int namelen, secno down_ptr)
{
return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0);
}
static inline void copy_de(struct hpfs_dirent *dst, struct hpfs_dirent *src)
{
int a;
int n;
if (!dst || !src) return;
a = dst->down;
n = dst->not_8x3;
memcpy((char *)dst + 2, (char *)src + 2, 28);
dst->down = a;
dst->not_8x3 = n;
}
static inline unsigned tstbits(u32 *bmp, unsigned b, unsigned n)
{
int i;
if ((b >= 0x4000) || (b + n - 1 >= 0x4000)) return n;
if (!((le32_to_cpu(bmp[(b & 0x3fff) >> 5]) >> (b & 0x1f)) & 1)) return 1;
for (i = 1; i < n; i++)
if (!((le32_to_cpu(bmp[((b+i) & 0x3fff) >> 5]) >> ((b+i) & 0x1f)) & 1))
return i + 1;
return 0;
}
/* alloc.c */
int hpfs_chk_sectors(struct super_block *, secno, int, char *);
secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int);
int hpfs_alloc_if_possible(struct super_block *, secno);
void hpfs_free_sectors(struct super_block *, secno, unsigned);
int hpfs_check_free_dnodes(struct super_block *, int);
void hpfs_free_dnode(struct super_block *, secno);
struct dnode *hpfs_alloc_dnode(struct super_block *, secno, dnode_secno *, struct quad_buffer_head *);
struct fnode *hpfs_alloc_fnode(struct super_block *, secno, fnode_secno *, struct buffer_head **);
struct anode *hpfs_alloc_anode(struct super_block *, secno, anode_secno *, struct buffer_head **);
/* anode.c */
secno hpfs_bplus_lookup(struct super_block *, struct inode *, struct bplus_header *, unsigned, struct buffer_head *);
secno hpfs_add_sector_to_btree(struct super_block *, secno, int, unsigned);
void hpfs_remove_btree(struct super_block *, struct bplus_header *);
int hpfs_ea_read(struct super_block *, secno, int, unsigned, unsigned, char *);
int hpfs_ea_write(struct super_block *, secno, int, unsigned, unsigned, const char *);
void hpfs_ea_remove(struct super_block *, secno, int, unsigned);
void hpfs_truncate_btree(struct super_block *, secno, int, unsigned);
void hpfs_remove_fnode(struct super_block *, fnode_secno fno);
/* buffer.c */
void *hpfs_map_sector(struct super_block *, unsigned, struct buffer_head **, int);
void *hpfs_get_sector(struct super_block *, unsigned, struct buffer_head **);
void *hpfs_map_4sectors(struct super_block *, unsigned, struct quad_buffer_head *, int);
void *hpfs_get_4sectors(struct super_block *, unsigned, struct quad_buffer_head *);
void hpfs_brelse4(struct quad_buffer_head *);
void hpfs_mark_4buffers_dirty(struct quad_buffer_head *);
/* dentry.c */
extern const struct dentry_operations hpfs_dentry_operations;
/* dir.c */
struct dentry *hpfs_lookup(struct inode *, struct dentry *, struct nameidata *);
extern const struct file_operations hpfs_dir_ops;
/* dnode.c */
void hpfs_add_pos(struct inode *, loff_t *);
void hpfs_del_pos(struct inode *, loff_t *);
struct hpfs_dirent *hpfs_add_de(struct super_block *, struct dnode *,
const unsigned char *, unsigned, secno);
int hpfs_add_dirent(struct inode *, const unsigned char *, unsigned,
struct hpfs_dirent *);
int hpfs_remove_dirent(struct inode *, dnode_secno, struct hpfs_dirent *, struct quad_buffer_head *, int);
void hpfs_count_dnodes(struct super_block *, dnode_secno, int *, int *, int *);
dnode_secno hpfs_de_as_down_as_possible(struct super_block *, dnode_secno dno);
struct hpfs_dirent *map_pos_dirent(struct inode *, loff_t *, struct quad_buffer_head *);
struct hpfs_dirent *map_dirent(struct inode *, dnode_secno,
const unsigned char *, unsigned, dnode_secno *,
struct quad_buffer_head *);
void hpfs_remove_dtree(struct super_block *, dnode_secno);
struct hpfs_dirent *map_fnode_dirent(struct super_block *, fnode_secno, struct fnode *, struct quad_buffer_head *);
/* ea.c */
void hpfs_ea_ext_remove(struct super_block *, secno, int, unsigned);
int hpfs_read_ea(struct super_block *, struct fnode *, char *, char *, int);
char *hpfs_get_ea(struct super_block *, struct fnode *, char *, int *);
void hpfs_set_ea(struct inode *, struct fnode *, const char *,
const char *, int);
/* file.c */
int hpfs_file_fsync(struct file *, loff_t, loff_t, int);
extern const struct file_operations hpfs_file_ops;
extern const struct inode_operations hpfs_file_iops;
extern const struct address_space_operations hpfs_aops;
/* inode.c */
void hpfs_init_inode(struct inode *);
void hpfs_read_inode(struct inode *);
void hpfs_write_inode(struct inode *);
void hpfs_write_inode_nolock(struct inode *);
int hpfs_setattr(struct dentry *, struct iattr *);
void hpfs_write_if_changed(struct inode *);
void hpfs_evict_inode(struct inode *);
/* map.c */
unsigned *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *);
unsigned *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *);
unsigned char *hpfs_load_code_page(struct super_block *, secno);
secno *hpfs_load_bitmap_directory(struct super_block *, secno bmp);
struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **);
struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **);
struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *);
dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino);
/* name.c */
unsigned char hpfs_upcase(unsigned char *, unsigned char);
int hpfs_chk_name(const unsigned char *, unsigned *);
unsigned char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int);
int hpfs_compare_names(struct super_block *, const unsigned char *, unsigned,
const unsigned char *, unsigned, int);
int hpfs_is_name_long(const unsigned char *, unsigned);
void hpfs_adjust_length(const unsigned char *, unsigned *);
/* namei.c */
extern const struct inode_operations hpfs_dir_iops;
extern const struct address_space_operations hpfs_symlink_aops;
static inline struct hpfs_inode_info *hpfs_i(struct inode *inode)
{
return list_entry(inode, struct hpfs_inode_info, vfs_inode);
}
static inline struct hpfs_sb_info *hpfs_sb(struct super_block *sb)
{
return sb->s_fs_info;
}
/* super.c */
void hpfs_error(struct super_block *, const char *, ...)
__attribute__((format (printf, 2, 3)));
int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *);
unsigned hpfs_count_one_bitmap(struct super_block *, secno);
/*
* local time (HPFS) to GMT (Unix)
*/
static inline time_t local_to_gmt(struct super_block *s, time32_t t)
{
extern struct timezone sys_tz;
return t + sys_tz.tz_minuteswest * 60 + hpfs_sb(s)->sb_timeshift;
}
static inline time32_t gmt_to_local(struct super_block *s, time_t t)
{
extern struct timezone sys_tz;
return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift;
}
/*
* Locking:
*
* hpfs_lock() locks the whole filesystem. It must be taken
* on any method called by the VFS.
*
* We don't do any per-file locking anymore, it is hard to
* review and HPFS is not performance-sensitive anyway.
*/
static inline void hpfs_lock(struct super_block *s)
{
struct hpfs_sb_info *sbi = hpfs_sb(s);
mutex_lock(&sbi->hpfs_mutex);
}
static inline void hpfs_unlock(struct super_block *s)
{
struct hpfs_sb_info *sbi = hpfs_sb(s);
mutex_unlock(&sbi->hpfs_mutex);
}
static inline void hpfs_lock_assert(struct super_block *s)
{
struct hpfs_sb_info *sbi = hpfs_sb(s);
WARN_ON(!mutex_is_locked(&sbi->hpfs_mutex));
}
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