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Import the Linux ext2fs files that our GPL'ed ext2fs files seem to be

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based on.

Obtained from:	Linux 1.2.2 distribution
This commit is contained in:
bde 2000-01-01 11:05:19 +00:00
parent 86f1bc4514
commit 0fb3f8eb84
7 changed files with 1491 additions and 559 deletions
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26
sys/gnu/ext2fs/ext2_bitmap.c Normal file
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@ -0,0 +1,26 @@
/*
* linux/fs/ext2/bitmap.c
*
* Copyright (C) 1992, 1993, 1994, 1995
* Remy Card (card@masi.ibp.fr)
* Laboratoire MASI - Institut Blaise Pascal
* Universite Pierre et Marie Curie (Paris VI)
*/
#include <linux/fs.h>
#include <linux/ext2_fs.h>
static int nibblemap[] = {4, 3, 3, 2, 3, 2, 2, 1, 3, 2, 2, 1, 2, 1, 1, 0};
unsigned long ext2_count_free (struct buffer_head * map, unsigned int numchars)
{
unsigned int i;
unsigned long sum = 0;
if (!map)
return (0);
for (i = 0; i < numchars; i++)
sum += nibblemap[map->b_data[i] & 0xf] +
nibblemap[(map->b_data[i] >> 4) & 0xf];
return (sum);
}

275
sys/gnu/ext2fs/ext2_fs.h
View File

@ -1,9 +1,3 @@
/*
* modified for EXT2FS support in Lites 1.1
*
* Aug 1995, Godmar Back (gback@cs.utah.edu)
* University of Utah, Department of Computer Science
*/
/*
* linux/include/linux/ext2_fs.h
*
@ -18,45 +12,11 @@
*
* Copyright (C) 1991, 1992 Linus Torvalds
*/
#ifndef _LINUX_EXT2_FS_H
#define _LINUX_EXT2_FS_H
#include <sys/types.h>
#ifdef i386
#if defined(__FreeBSD__)
#include <machine/types.h>
#else
#include <i386/types.h>
#endif
#else
#error need processor specific types
#endif
#define __u32 u_int32_t
#define u32 u_int32_t
#define __u16 u_int16_t
#define __u8 u_int8_t
#define __s32 int32_t
#define __s16 int16_t
#define __s8 int8_t
#define umode_t mode_t
#define loff_t off_t
/* the Linux implementation of EXT2 stores some information about
* an inode in a ext2_inode_info structure which is part of the incore
* inode in Linux
* I decided to use the i_spare[11] fields instead - we'll see how this
* works out
*/
#define i_block_group i_spare[0]
#define i_next_alloc_block i_spare[1]
#define i_next_alloc_goal i_spare[2]
#define i_prealloc_block i_spare[3]
#define i_prealloc_count i_spare[4]
#include <linux/types.h>
/*
* The second extended filesystem constants/structures
@ -98,9 +58,9 @@
*/
#ifdef EXT2FS_DEBUG
# define ext2_debug(f, a...) { \
printf ("EXT2-fs DEBUG (%s, %d): %s:", \
printk ("EXT2-fs DEBUG (%s, %d): %s:", \
__FILE__, __LINE__, __FUNCTION__); \
printf (f, ## a); \
printk (f, ## a); \
}
#else
# define ext2_debug(f, a...) /**/
@ -134,16 +94,19 @@
#define EXT2_MIN_BLOCK_SIZE 1024
#define EXT2_MAX_BLOCK_SIZE 4096
#define EXT2_MIN_BLOCK_LOG_SIZE 10
#ifdef __KERNEL__
# define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize)
#define EXT2_ACLE_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / \
sizeof (struct ext2_acl_entry))
#else
# define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
#endif
#define EXT2_ACLE_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_acl_entry))
#define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32))
#ifdef __KERNEL__
# define EXT2_BLOCK_SIZE_BITS(s) ((s)->u.ext2_sb.s_es->s_log_block_size + 10)
#else
# define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
#define EXT2_INODE_SIZE 128
/* ought to be sizeof (struct ext2_inode)) */
#define EXT2_INODES_PER_BLOCK(s) ((s)->s_inodes_per_block)
#endif
#define EXT2_INODES_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_inode))
/*
* Macro-instructions used to manage fragments
@ -151,8 +114,13 @@
#define EXT2_MIN_FRAG_SIZE 1024
#define EXT2_MAX_FRAG_SIZE 4096
#define EXT2_MIN_FRAG_LOG_SIZE 10
#define EXT2_FRAG_SIZE(s) ((s)->s_frag_size)
#ifdef __KERNEL__
# define EXT2_FRAG_SIZE(s) ((s)->u.ext2_sb.s_frag_size)
# define EXT2_FRAGS_PER_BLOCK(s) ((s)->u.ext2_sb.s_frags_per_block)
#else
# define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
# define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
#endif
/*
* ACL structures
@ -203,9 +171,15 @@ struct ext2_group_desc
/*
* Macro-instructions used to manage group descriptors
*/
#define EXT2_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
#define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
#ifdef __KERNEL__
# define EXT2_BLOCKS_PER_GROUP(s) ((s)->u.ext2_sb.s_blocks_per_group)
# define EXT2_DESC_PER_BLOCK(s) ((s)->u.ext2_sb.s_desc_per_block)
# define EXT2_INODES_PER_GROUP(s) ((s)->u.ext2_sb.s_inodes_per_group)
#else
# define EXT2_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
# define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
# define EXT2_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
#endif
/*
* Constants relative to the data blocks
@ -215,7 +189,6 @@ struct ext2_group_desc
#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1)
#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1)
#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1)
#define EXT2_MAXSYMLINKLEN (EXT2_N_BLOCKS * sizeof (__u32))
/*
* Inode flags
@ -236,6 +209,84 @@ struct ext2_group_desc
#define EXT2_IOC_GETVERSION _IOR('v', 1, long)
#define EXT2_IOC_SETVERSION _IOW('v', 2, long)
/*
* Structure of an inode on the disk
*/
struct ext2_inode {
__u16 i_mode; /* File mode */
__u16 i_uid; /* Owner Uid */
__u32 i_size; /* Size in bytes */
__u32 i_atime; /* Access time */
__u32 i_ctime; /* Creation time */
__u32 i_mtime; /* Modification time */
__u32 i_dtime; /* Deletion Time */
__u16 i_gid; /* Group Id */
__u16 i_links_count; /* Links count */
__u32 i_blocks; /* Blocks count */
__u32 i_flags; /* File flags */
union {
struct {
__u32 l_i_reserved1;
} linux1;
struct {
__u32 h_i_translator;
} hurd1;
struct {
__u32 m_i_reserved1;
} masix1;
} osd1; /* OS dependent 1 */
__u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
__u32 i_version; /* File version (for NFS) */
__u32 i_file_acl; /* File ACL */
__u32 i_dir_acl; /* Directory ACL */
__u32 i_faddr; /* Fragment address */
union {
struct {
__u8 l_i_frag; /* Fragment number */
__u8 l_i_fsize; /* Fragment size */
__u16 i_pad1;
__u32 l_i_reserved2[2];
} linux2;
struct {
__u8 h_i_frag; /* Fragment number */
__u8 h_i_fsize; /* Fragment size */
__u16 h_i_mode_high;
__u16 h_i_uid_high;
__u16 h_i_gid_high;
__u32 h_i_author;
} hurd2;
struct {
__u8 m_i_frag; /* Fragment number */
__u8 m_i_fsize; /* Fragment size */
__u16 m_pad1;
__u32 m_i_reserved2[2];
} masix2;
} osd2; /* OS dependent 2 */
};
#if defined(__KERNEL__) || defined(__linux__)
#define i_reserved1 osd1.linux1.l_i_reserved1
#define i_frag osd2.linux2.l_i_frag
#define i_fsize osd2.linux2.l_i_fsize
#define i_reserved2 osd2.linux2.l_i_reserved2
#endif
#ifdef __hurd__
#define i_translator osd1.hurd1.h_i_translator
#define i_frag osd2.hurd2.h_i_frag;
#define i_fsize osd2.hurd2.h_i_fsize;
#define i_uid_high osd2.hurd2.h_i_uid_high
#define i_gid_high osd2.hurd2.h_i_gid_high
#define i_author osd2.hurd2.h_i_author
#endif
#ifdef __masix__
#define i_reserved1 osd1.masix1.m_i_reserved1
#define i_frag osd2.masix2.m_i_frag
#define i_fsize osd2.masix2.m_i_fsize
#define i_reserved2 osd2.masix2.m_i_reserved2
#endif
/*
* File system states
*/
@ -337,4 +388,118 @@ struct ext2_dir_entry {
#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \
~EXT2_DIR_ROUND)
#ifdef __KERNEL__
/*
* Function prototypes
*/
/*
* Ok, these declarations are also in <linux/kernel.h> but none of the
* ext2 source programs needs to include it so they are duplicated here.
*/
#if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 5)
# define NORET_TYPE __volatile__
# define ATTRIB_NORET /**/
# define NORET_AND /**/
#else
# define NORET_TYPE /**/
# define ATTRIB_NORET __attribute__((noreturn))
# define NORET_AND noreturn,
#endif
/* acl.c */
extern int ext2_permission (struct inode *, int);
/* balloc.c */
extern int ext2_new_block (struct super_block *, unsigned long,
__u32 *, __u32 *);
extern void ext2_free_blocks (struct super_block *, unsigned long,
unsigned long);
extern unsigned long ext2_count_free_blocks (struct super_block *);
extern void ext2_check_blocks_bitmap (struct super_block *);
/* bitmap.c */
extern unsigned long ext2_count_free (struct buffer_head *, unsigned);
/* dir.c */
extern int ext2_check_dir_entry (char *, struct inode *,
struct ext2_dir_entry *, struct buffer_head *,
unsigned long);
/* file.c */
extern int ext2_read (struct inode *, struct file *, char *, int);
extern int ext2_write (struct inode *, struct file *, char *, int);
/* fsync.c */
extern int ext2_sync_file (struct inode *, struct file *);
/* ialloc.c */
extern struct inode * ext2_new_inode (const struct inode *, int);
extern void ext2_free_inode (struct inode *);
extern unsigned long ext2_count_free_inodes (struct super_block *);
extern void ext2_check_inodes_bitmap (struct super_block *);
/* inode.c */
extern int ext2_bmap (struct inode *, int);
extern struct buffer_head * ext2_getblk (struct inode *, long, int, int *);
extern struct buffer_head * ext2_bread (struct inode *, int, int, int *);
extern int ext2_getcluster (struct inode * inode, long block);
extern void ext2_read_inode (struct inode *);
extern void ext2_write_inode (struct inode *);
extern void ext2_put_inode (struct inode *);
extern int ext2_sync_inode (struct inode *);
extern void ext2_discard_prealloc (struct inode *);
/* ioctl.c */
extern int ext2_ioctl (struct inode *, struct file *, unsigned int,
unsigned long);
/* namei.c */
extern void ext2_release (struct inode *, struct file *);
extern int ext2_lookup (struct inode *,const char *, int, struct inode **);
extern int ext2_create (struct inode *,const char *, int, int,
struct inode **);
extern int ext2_mkdir (struct inode *, const char *, int, int);
extern int ext2_rmdir (struct inode *, const char *, int);
extern int ext2_unlink (struct inode *, const char *, int);
extern int ext2_symlink (struct inode *, const char *, int, const char *);
extern int ext2_link (struct inode *, struct inode *, const char *, int);
extern int ext2_mknod (struct inode *, const char *, int, int, int);
extern int ext2_rename (struct inode *, const char *, int,
struct inode *, const char *, int);
/* super.c */
extern void ext2_error (struct super_block *, const char *, const char *, ...)
__attribute__ ((format (printf, 3, 4)));
extern NORET_TYPE void ext2_panic (struct super_block *, const char *,
const char *, ...)
__attribute__ ((NORET_AND format (printf, 3, 4)));
extern void ext2_warning (struct super_block *, const char *, const char *, ...)
__attribute__ ((format (printf, 3, 4)));
extern void ext2_put_super (struct super_block *);
extern void ext2_write_super (struct super_block *);
extern int ext2_remount (struct super_block *, int *, char *);
extern struct super_block * ext2_read_super (struct super_block *,void *,int);
extern void ext2_statfs (struct super_block *, struct statfs *);
/* truncate.c */
extern void ext2_truncate (struct inode *);
/*
* Inodes and files operations
*/
/* dir.c */
extern struct inode_operations ext2_dir_inode_operations;
/* file.c */
extern struct inode_operations ext2_file_inode_operations;
/* symlink.c */
extern struct inode_operations ext2_symlink_inode_operations;
#endif /* __KERNEL__ */
#endif /* _LINUX_EXT2_FS_H */

86
sys/gnu/ext2fs/ext2_fs_i.h
View File

@ -1,15 +1,3 @@
/*
* added for EXT2FS support in Lites 1.1
*
* Aug 1995, Godmar Back (gback@cs.utah.edu)
* University of Utah, Department of Computer Science
*
* Note that this started out to be ext2_fs_i.h. In reality it
* doesn't have anything to do with. I put the declaration of
* the on disk ext2 format here from ext2_fs.h because this is
* something that would name clash with other stuff.
* This is used only in ext2_inode_cnv.c
*/
/*
* linux/include/linux/ext2_fs_i.h
*
@ -25,62 +13,28 @@
* Copyright (C) 1991, 1992 Linus Torvalds
*/
#ifndef _EXT2_FS_I
#define _EXT2_FS_I
#ifndef _LINUX_EXT2_FS_I
#define _LINUX_EXT2_FS_I
/*
* Structure of an inode on the disk
* second extended file system inode data in memory
*/
struct ext2_inode {
__u16 i_mode; /* File mode */
__u16 i_uid; /* Owner Uid */
__u32 i_size; /* Size in bytes */
__u32 i_atime; /* Access time */
__u32 i_ctime; /* Creation time */
__u32 i_mtime; /* Modification time */
__u32 i_dtime; /* Deletion Time */
__u16 i_gid; /* Group Id */
__u16 i_links_count; /* Links count */
__u32 i_blocks; /* Blocks count */
__u32 i_flags; /* File flags */
union {
struct {
__u32 l_i_reserved1;
} linux1;
struct {
__u32 h_i_translator;
} hurd1;
struct {
__u32 m_i_reserved1;
} masix1;
} osd1; /* OS dependent 1 */
__u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
__u32 i_version; /* File version (for NFS) */
__u32 i_file_acl; /* File ACL */
__u32 i_dir_acl; /* Directory ACL */
__u32 i_faddr; /* Fragment address */
union {
struct {
__u8 l_i_frag; /* Fragment number */
__u8 l_i_fsize; /* Fragment size */
__u16 i_pad1;
__u32 l_i_reserved2[2];
} linux2;
struct {
__u8 h_i_frag; /* Fragment number */
__u8 h_i_fsize; /* Fragment size */
__u16 h_i_mode_high;
__u16 h_i_uid_high;
__u16 h_i_gid_high;
__u32 h_i_author;
} hurd2;
struct {
__u8 m_i_frag; /* Fragment number */
__u8 m_i_fsize; /* Fragment size */
__u16 m_pad1;
__u32 m_i_reserved2[2];
} masix2;
} osd2; /* OS dependent 2 */
struct ext2_inode_info {
__u32 i_data[15];
__u32 i_flags;
__u32 i_faddr;
__u8 i_frag_no;
__u8 i_frag_size;
__u16 i_osync;
__u32 i_file_acl;
__u32 i_dir_acl;
__u32 i_dtime;
__u32 i_version;
__u32 i_block_group;
__u32 i_next_alloc_block;
__u32 i_next_alloc_goal;
__u32 i_prealloc_block;
__u32 i_prealloc_count;
};
#endif /* _EXT2_FS_I */
#endif /* _LINUX_EXT2_FS_I */

29
sys/gnu/ext2fs/ext2_fs_sb.h
View File

@ -1,9 +1,3 @@
/*
* modified for EXT2FS support in Lites 1.1
*
* Aug 1995, Godmar Back (gback@cs.utah.edu)
* University of Utah, Department of Computer Science
*/
/*
* linux/include/linux/ext2_fs_sb.h
*
@ -30,11 +24,6 @@
#define EXT2_MAX_GROUP_LOADED 8
#if defined(LITES) || defined(__FreeBSD__)
#define buffer_head buf
#define MAXMNTLEN 512
#endif
/*
* second extended-fs super-block data in memory
*/
@ -59,29 +48,11 @@ struct ext2_sb_info {
unsigned long s_block_bitmap_number[EXT2_MAX_GROUP_LOADED];
struct buffer_head * s_block_bitmap[EXT2_MAX_GROUP_LOADED];
int s_rename_lock;
#if !defined(LITES) && !defined(__FreeBSD__)
struct wait_queue * s_rename_wait;
#endif
unsigned long s_mount_opt;
unsigned short s_resuid;
unsigned short s_resgid;
unsigned short s_mount_state;
#if defined(LITES) || defined(__FreeBSD__)
/*
stuff that FFS keeps in its super block or that linux
has in its non-ext2 specific super block and which is
generally considered useful
*/
unsigned long s_blocksize;
unsigned long s_blocksize_bits;
unsigned int s_bshift; /* = log2(s_blocksize) */
quad_t s_qbmask; /* = s_blocksize - 1 */
unsigned int s_fsbtodb; /* shift to get disk block */
char s_rd_only; /* read-only */
char s_dirt; /* fs modified flag */
char fs_fsmnt[MAXMNTLEN]; /* name mounted on */
#endif
};
#endif /* _LINUX_EXT2_FS_SB */

387
sys/gnu/ext2fs/ext2_linux_balloc.c
View File

@ -1,9 +1,3 @@
/*
* modified for Lites 1.1
*
* Aug 1995, Godmar Back (gback@cs.utah.edu)
* University of Utah, Department of Computer Science
*/
/*
* linux/fs/ext2/balloc.c
*
@ -15,6 +9,10 @@
* Enhanced block allocation by Stephen Tweedie (sct@dcs.ed.ac.uk), 1993
*/
/*
* balloc.c contains the blocks allocation and deallocation routines
*/
/*
* The free blocks are managed by bitmaps. A file system contains several
* blocks groups. Each group contains 1 bitmap block for blocks, 1 bitmap
@ -26,53 +24,61 @@
* when a file system is mounted (see ext2_read_super).
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <linux/fs.h>
#include <linux/ext2_fs.h>
#include <linux/stat.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/locks.h>
#include <ufs/ufs/quota.h>
#include <ufs/ufs/ufsmount.h>
#include <gnu/ext2fs/ext2_extern.h>
#include <gnu/ext2fs/ext2_fs.h>
#include <gnu/ext2fs/ext2_fs_sb.h>
#include <gnu/ext2fs/fs.h>
#include <sys/stat.h>
#ifdef i386
#include <gnu/ext2fs/i386-bitops.h>
#else
#error Provide an bitops.h file, please !
#endif
unsigned long ext2_count_free __P((struct buffer_head *, unsigned int));
#include <asm/bitops.h>
#define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
/* got rid of get_group_desc since it can already be found in
* ext2_linux_ialloc.c
*/
static struct ext2_group_desc * get_group_desc (struct super_block * sb,
unsigned int block_group,
struct buffer_head ** bh)
{
unsigned long group_desc;
unsigned long desc;
struct ext2_group_desc * gdp;
static void read_block_bitmap (struct mount * mp,
if (block_group >= sb->u.ext2_sb.s_groups_count)
ext2_panic (sb, "get_group_desc",
"block_group >= groups_count - "
"block_group = %d, groups_count = %lu",
block_group, sb->u.ext2_sb.s_groups_count);
group_desc = block_group / EXT2_DESC_PER_BLOCK(sb);
desc = block_group % EXT2_DESC_PER_BLOCK(sb);
if (!sb->u.ext2_sb.s_group_desc[group_desc])
ext2_panic (sb, "get_group_desc",
"Group descriptor not loaded - "
"block_group = %d, group_desc = %lu, desc = %lu",
block_group, group_desc, desc);
gdp = (struct ext2_group_desc *)
sb->u.ext2_sb.s_group_desc[group_desc]->b_data;
if (bh)
*bh = sb->u.ext2_sb.s_group_desc[group_desc];
return gdp + desc;
}
static void read_block_bitmap (struct super_block * sb,
unsigned int block_group,
unsigned long bitmap_nr)
{
struct ext2_sb_info *sb = VFSTOUFS(mp)->um_e2fs;
struct ext2_group_desc * gdp;
struct buffer_head * bh;
int error;
gdp = get_group_desc (mp, block_group, NULL);
if(error = bread (VFSTOUFS(mp)->um_devvp,
fsbtodb(sb, gdp->bg_block_bitmap),sb->s_blocksize, NOCRED, &bh))
panic ( "read_block_bitmap: "
gdp = get_group_desc (sb, block_group, NULL);
bh = bread (sb->s_dev, gdp->bg_block_bitmap, sb->s_blocksize);
if (!bh)
ext2_panic (sb, "read_block_bitmap",
"Cannot read block bitmap - "
"block_group = %d, block_bitmap = %lu",
block_group, (unsigned long) gdp->bg_block_bitmap);
sb->s_block_bitmap_number[bitmap_nr] = block_group;
sb->s_block_bitmap[bitmap_nr] = bh;
sb->u.ext2_sb.s_block_bitmap_number[bitmap_nr] = block_group;
sb->u.ext2_sb.s_block_bitmap[bitmap_nr] = bh;
}
/*
@ -86,86 +92,82 @@ static void read_block_bitmap (struct mount * mp,
* 2/ If the file system contains less than EXT2_MAX_GROUP_LOADED groups,
* this function reads the bitmap without maintaining a LRU cache.
*/
static int load__block_bitmap (struct mount * mp,
static int load__block_bitmap (struct super_block * sb,
unsigned int block_group)
{
int i, j;
struct ext2_sb_info *sb = VFSTOUFS(mp)->um_e2fs;
unsigned long block_bitmap_number;
struct buffer_head * block_bitmap;
int error;
if (block_group >= sb->s_groups_count)
panic ( "load_block_bitmap: "
if (block_group >= sb->u.ext2_sb.s_groups_count)
ext2_panic (sb, "load_block_bitmap",
"block_group >= groups_count - "
"block_group = %d, groups_count = %lu",
block_group, sb->s_groups_count);
block_group, sb->u.ext2_sb.s_groups_count);
if (sb->s_groups_count <= EXT2_MAX_GROUP_LOADED) {
if (sb->s_block_bitmap[block_group]) {
if (sb->s_block_bitmap_number[block_group] !=
if (sb->u.ext2_sb.s_groups_count <= EXT2_MAX_GROUP_LOADED) {
if (sb->u.ext2_sb.s_block_bitmap[block_group]) {
if (sb->u.ext2_sb.s_block_bitmap_number[block_group] !=
block_group)
panic ( "load_block_bitmap: "
ext2_panic (sb, "load_block_bitmap",
"block_group != block_bitmap_number");
else
return block_group;
} else {
read_block_bitmap (mp, block_group, block_group);
read_block_bitmap (sb, block_group, block_group);
return block_group;
}
}
for (i = 0; i < sb->s_loaded_block_bitmaps &&
sb->s_block_bitmap_number[i] != block_group; i++)
for (i = 0; i < sb->u.ext2_sb.s_loaded_block_bitmaps &&
sb->u.ext2_sb.s_block_bitmap_number[i] != block_group; i++)
;
if (i < sb->s_loaded_block_bitmaps &&
sb->s_block_bitmap_number[i] == block_group) {
block_bitmap_number = sb->s_block_bitmap_number[i];
block_bitmap = sb->s_block_bitmap[i];
if (i < sb->u.ext2_sb.s_loaded_block_bitmaps &&
sb->u.ext2_sb.s_block_bitmap_number[i] == block_group) {
block_bitmap_number = sb->u.ext2_sb.s_block_bitmap_number[i];
block_bitmap = sb->u.ext2_sb.s_block_bitmap[i];
for (j = i; j > 0; j--) {
sb->s_block_bitmap_number[j] =
sb->s_block_bitmap_number[j - 1];
sb->s_block_bitmap[j] =
sb->s_block_bitmap[j - 1];
sb->u.ext2_sb.s_block_bitmap_number[j] =
sb->u.ext2_sb.s_block_bitmap_number[j - 1];
sb->u.ext2_sb.s_block_bitmap[j] =
sb->u.ext2_sb.s_block_bitmap[j - 1];
}
sb->s_block_bitmap_number[0] = block_bitmap_number;
sb->s_block_bitmap[0] = block_bitmap;
sb->u.ext2_sb.s_block_bitmap_number[0] = block_bitmap_number;
sb->u.ext2_sb.s_block_bitmap[0] = block_bitmap;
} else {
if (sb->s_loaded_block_bitmaps < EXT2_MAX_GROUP_LOADED)
sb->s_loaded_block_bitmaps++;
if (sb->u.ext2_sb.s_loaded_block_bitmaps < EXT2_MAX_GROUP_LOADED)
sb->u.ext2_sb.s_loaded_block_bitmaps++;
else
brelse (sb->s_block_bitmap[EXT2_MAX_GROUP_LOADED - 1]);
for (j = sb->s_loaded_block_bitmaps - 1; j > 0; j--) {
sb->s_block_bitmap_number[j] =
sb->s_block_bitmap_number[j - 1];
sb->s_block_bitmap[j] =
sb->s_block_bitmap[j - 1];
brelse (sb->u.ext2_sb.s_block_bitmap[EXT2_MAX_GROUP_LOADED - 1]);
for (j = sb->u.ext2_sb.s_loaded_block_bitmaps - 1; j > 0; j--) {
sb->u.ext2_sb.s_block_bitmap_number[j] =
sb->u.ext2_sb.s_block_bitmap_number[j - 1];
sb->u.ext2_sb.s_block_bitmap[j] =
sb->u.ext2_sb.s_block_bitmap[j - 1];
}
read_block_bitmap (mp, block_group, 0);
read_block_bitmap (sb, block_group, 0);
}
return 0;
}
static inline int load_block_bitmap (struct mount * mp,
static inline int load_block_bitmap (struct super_block * sb,
unsigned int block_group)
{
struct ext2_sb_info *sb = VFSTOUFS(mp)->um_e2fs;
if (sb->s_loaded_block_bitmaps > 0 &&
sb->s_block_bitmap_number[0] == block_group)
if (sb->u.ext2_sb.s_loaded_block_bitmaps > 0 &&
sb->u.ext2_sb.s_block_bitmap_number[0] == block_group)
return 0;
if (sb->s_groups_count <= EXT2_MAX_GROUP_LOADED &&
sb->s_block_bitmap_number[block_group] == block_group &&
sb->s_block_bitmap[block_group])
if (sb->u.ext2_sb.s_groups_count <= EXT2_MAX_GROUP_LOADED &&
sb->u.ext2_sb.s_block_bitmap_number[block_group] == block_group &&
sb->u.ext2_sb.s_block_bitmap[block_group])
return block_group;
return load__block_bitmap (mp, block_group);
return load__block_bitmap (sb, block_group);
}
void ext2_free_blocks (struct mount * mp, unsigned long block,
void ext2_free_blocks (struct super_block * sb, unsigned long block,
unsigned long count)
{
struct ext2_sb_info *sb = VFSTOUFS(mp)->um_e2fs;
struct buffer_head * bh;
struct buffer_head * bh2;
unsigned long block_group;
@ -173,51 +175,52 @@ void ext2_free_blocks (struct mount * mp, unsigned long block,
unsigned long i;
int bitmap_nr;
struct ext2_group_desc * gdp;
struct ext2_super_block * es = sb->s_es;
struct ext2_super_block * es;
if (!sb) {
printf ("ext2_free_blocks: nonexistent device");
printk ("ext2_free_blocks: nonexistent device");
return;
}
lock_super (VFSTOUFS(mp)->um_devvp);
lock_super (sb);
es = sb->u.ext2_sb.s_es;
if (block < es->s_first_data_block ||
(block + count) > es->s_blocks_count) {
printf ( "ext2_free_blocks: "
ext2_error (sb, "ext2_free_blocks",
"Freeing blocks not in datazone - "
"block = %lu, count = %lu", block, count);
unlock_super (VFSTOUFS(mp)->um_devvp);
unlock_super (sb);
return;
}
ext2_debug ("freeing blocks %lu to %lu\n", block, block+count-1);
ext2_debug ("freeing block %lu\n", block);
block_group = (block - es->s_first_data_block) /
EXT2_BLOCKS_PER_GROUP(sb);
bit = (block - es->s_first_data_block) % EXT2_BLOCKS_PER_GROUP(sb);
if (bit + count > EXT2_BLOCKS_PER_GROUP(sb))
panic ( "ext2_free_blocks: "
ext2_panic (sb, "ext2_free_blocks",
"Freeing blocks across group boundary - "
"Block = %lu, count = %lu",
block, count);
bitmap_nr = load_block_bitmap (mp, block_group);
bh = sb->s_block_bitmap[bitmap_nr];
gdp = get_group_desc (mp, block_group, &bh2);
bitmap_nr = load_block_bitmap (sb, block_group);
bh = sb->u.ext2_sb.s_block_bitmap[bitmap_nr];
gdp = get_group_desc (sb, block_group, &bh2);
if (/* test_opt (sb, CHECK_STRICT) && assume always strict ! */
if (test_opt (sb, CHECK_STRICT) &&
(in_range (gdp->bg_block_bitmap, block, count) ||
in_range (gdp->bg_inode_bitmap, block, count) ||
in_range (block, gdp->bg_inode_table,
sb->s_itb_per_group) ||
sb->u.ext2_sb.s_itb_per_group) ||
in_range (block + count - 1, gdp->bg_inode_table,
sb->s_itb_per_group)))
panic ( "ext2_free_blocks: "
sb->u.ext2_sb.s_itb_per_group)))
ext2_panic (sb, "ext2_free_blocks",
"Freeing blocks in system zones - "
"Block = %lu, count = %lu",
block, count);
for (i = 0; i < count; i++) {
if (!clear_bit (bit + i, bh->b_data))
printf ("ext2_free_blocks: "
ext2_warning (sb, "ext2_free_blocks",
"bit already cleared for block %lu",
block);
else {
@ -226,16 +229,16 @@ void ext2_free_blocks (struct mount * mp, unsigned long block,
}
}
mark_buffer_dirty(bh2);
mark_buffer_dirty(bh2, 1);
mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
mark_buffer_dirty(bh, 1);
/****
if (sb->s_flags & MS_SYNCHRONOUS) {
ll_rw_block (WRITE, 1, &bh);
wait_on_buffer (bh);
}
****/
sb->s_dirt = 1;
unlock_super (VFSTOUFS(mp)->um_devvp);
unlock_super (sb);
return;
}
@ -246,27 +249,35 @@ void ext2_free_blocks (struct mount * mp, unsigned long block,
* each block group the search first looks for an entire free byte in the block
* bitmap, and then for any free bit if that fails.
*/
int ext2_new_block (struct mount * mp, unsigned long goal,
long * prealloc_count,
long * prealloc_block)
int ext2_new_block (struct super_block * sb, unsigned long goal,
u32 * prealloc_count,
u32 * prealloc_block)
{
struct ext2_sb_info *sb = VFSTOUFS(mp)->um_e2fs;
struct buffer_head * bh;
struct buffer_head * bh2;
char * p, * r;
int i, j, k, tmp;
unsigned long lmap;
int bitmap_nr;
struct ext2_group_desc * gdp;
struct ext2_super_block * es = sb->s_es;
struct ext2_super_block * es;
#ifdef EXT2FS_DEBUG
static int goal_hits = 0, goal_attempts = 0;
#endif
if (!sb) {
printf ("ext2_new_block: nonexistent device");
printk ("ext2_new_block: nonexistent device");
return 0;
}
lock_super (sb);
es = sb->u.ext2_sb.s_es;
if (es->s_free_blocks_count <= es->s_r_blocks_count &&
(!fsuser() && (sb->u.ext2_sb.s_resuid != current->fsuid) &&
(sb->u.ext2_sb.s_resgid == 0 ||
!in_group_p (sb->u.ext2_sb.s_resgid)))) {
unlock_super (sb);
return 0;
}
lock_super (VFSTOUFS(mp)->um_devvp);
ext2_debug ("goal=%lu.\n", goal);
@ -277,15 +288,15 @@ repeat:
if (goal < es->s_first_data_block || goal >= es->s_blocks_count)
goal = es->s_first_data_block;
i = (goal - es->s_first_data_block) / EXT2_BLOCKS_PER_GROUP(sb);
gdp = get_group_desc (mp, i, &bh2);
gdp = get_group_desc (sb, i, &bh2);
if (gdp->bg_free_blocks_count > 0) {
j = ((goal - es->s_first_data_block) % EXT2_BLOCKS_PER_GROUP(sb));
#ifdef EXT2FS_DEBUG
if (j)
goal_attempts++;
#endif
bitmap_nr = load_block_bitmap (mp, i);
bh = sb->s_block_bitmap[bitmap_nr];
bitmap_nr = load_block_bitmap (sb, i);
bh = sb->u.ext2_sb.s_block_bitmap[bitmap_nr];
ext2_debug ("goal is at %d:%d.\n", i, j);
@ -299,17 +310,23 @@ repeat:
if (j) {
/*
* The goal was occupied; search forward for a free
* block within the next XX blocks.
*
* end_goal is more or less random, but it has to be
* less than EXT2_BLOCKS_PER_GROUP. Aligning up to the
* next 64-bit boundary is simple..
* block within the next 32 blocks
*/
int end_goal = (j + 63) & ~63;
j = find_next_zero_bit(bh->b_data, end_goal, j);
if (j < end_goal)
lmap = ((((unsigned long *) bh->b_data)[j >> 5]) >>
((j & 31) + 1));
if (j < EXT2_BLOCKS_PER_GROUP(sb) - 32)
lmap |= (((unsigned long *) bh->b_data)[(j >> 5) + 1]) <<
(31 - (j & 31));
else
lmap |= 0xffffffff << (31 - (j & 31));
if (lmap != 0xffffffffl) {
k = ffz(lmap) + 1;
if ((j + k) < EXT2_BLOCKS_PER_GROUP(sb)) {
j += k;
goto got_block;
}
}
}
ext2_debug ("Bit not found near goal\n");
@ -344,32 +361,31 @@ repeat:
* Now search the rest of the groups. We assume that
* i and gdp correctly point to the last group visited.
*/
for (k = 0; k < sb->s_groups_count; k++) {
for (k = 0; k < sb->u.ext2_sb.s_groups_count; k++) {
i++;
if (i >= sb->s_groups_count)
if (i >= sb->u.ext2_sb.s_groups_count)
i = 0;
gdp = get_group_desc (mp, i, &bh2);
gdp = get_group_desc (sb, i, &bh2);
if (gdp->bg_free_blocks_count > 0)
break;
}
if (k >= sb->s_groups_count) {
unlock_super (VFSTOUFS(mp)->um_devvp);
if (k >= sb->u.ext2_sb.s_groups_count) {
unlock_super (sb);
return 0;
}
bitmap_nr = load_block_bitmap (mp, i);
bh = sb->s_block_bitmap[bitmap_nr];
bitmap_nr = load_block_bitmap (sb, i);
bh = sb->u.ext2_sb.s_block_bitmap[bitmap_nr];
r = memscan(bh->b_data, 0, EXT2_BLOCKS_PER_GROUP(sb) >> 3);
j = (r - bh->b_data) << 3;
if (j < EXT2_BLOCKS_PER_GROUP(sb))
goto search_back;
else
j = find_first_zero_bit ((unsigned long *) bh->b_data,
EXT2_BLOCKS_PER_GROUP(sb));
if (j >= EXT2_BLOCKS_PER_GROUP(sb)) {
printf ( "ext2_new_block: "
ext2_error (sb, "ext2_new_block",
"Free blocks count corrupted for block group %d", i);
unlock_super (VFSTOUFS(mp)->um_devvp);
unlock_super (sb);
return 0;
}
@ -387,16 +403,16 @@ got_block:
tmp = j + i * EXT2_BLOCKS_PER_GROUP(sb) + es->s_first_data_block;
if (/* test_opt (sb, CHECK_STRICT) && we are always strict. */
if (test_opt (sb, CHECK_STRICT) &&
(tmp == gdp->bg_block_bitmap ||
tmp == gdp->bg_inode_bitmap ||
in_range (tmp, gdp->bg_inode_table, sb->s_itb_per_group)))
panic ( "ext2_new_block: "
in_range (tmp, gdp->bg_inode_table, sb->u.ext2_sb.s_itb_per_group)))
ext2_panic (sb, "ext2_new_block",
"Allocating block in system zone - "
"%dth block = %u in group %u", j, tmp, i);
"block = %u", tmp);
if (set_bit (j, bh->b_data)) {
printf ( "ext2_new_block: "
ext2_warning (sb, "ext2_new_block",
"bit already set for block %d", j);
goto repeat;
}
@ -425,20 +441,28 @@ got_block:
j = tmp;
mark_buffer_dirty(bh);
/****
mark_buffer_dirty(bh, 1);
if (sb->s_flags & MS_SYNCHRONOUS) {
ll_rw_block (WRITE, 1, &bh);
wait_on_buffer (bh);
}
****/
if (j >= es->s_blocks_count) {
printf ( "ext2_new_block: "
ext2_error (sb, "ext2_new_block",
"block >= blocks count - "
"block_group = %d, block=%d", i, j);
unlock_super (VFSTOUFS(mp)->um_devvp);
unlock_super (sb);
return 0;
}
if (!(bh = getblk (sb->s_dev, j, sb->s_blocksize))) {
ext2_error (sb, "ext2_new_block", "cannot get block %d", j);
unlock_super (sb);
return 0;
}
memset(bh->b_data, 0, sb->s_blocksize);
bh->b_uptodate = 1;
mark_buffer_dirty(bh, 1);
brelse (bh);
ext2_debug ("allocating block %d. "
"Goal hits %d of %d.\n", j, goal_hits, goal_attempts);
@ -446,14 +470,14 @@ got_block:
gdp->bg_free_blocks_count--;
mark_buffer_dirty(bh2, 1);
es->s_free_blocks_count--;
mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
sb->s_dirt = 1;
unlock_super (VFSTOUFS(mp)->um_devvp);
unlock_super (sb);
return j;
}
unsigned long ext2_count_free_blocks (struct mount * mp)
unsigned long ext2_count_free_blocks (struct super_block * sb)
{
struct ext2_sb_info *sb = VFSTOUFS(mp)->um_e2fs;
#ifdef EXT2FS_DEBUG
struct ext2_super_block * es;
unsigned long desc_count, bitmap_count, x;
@ -461,42 +485,40 @@ unsigned long ext2_count_free_blocks (struct mount * mp)
struct ext2_group_desc * gdp;
int i;
lock_super (VFSTOUFS(mp)->um_devvp);
es = sb->s_es;
lock_super (sb);
es = sb->u.ext2_sb.s_es;
desc_count = 0;
bitmap_count = 0;
gdp = NULL;
for (i = 0; i < sb->s_groups_count; i++) {
gdp = get_group_desc (mp, i, NULL);
for (i = 0; i < sb->u.ext2_sb.s_groups_count; i++) {
gdp = get_group_desc (sb, i, NULL);
desc_count += gdp->bg_free_blocks_count;
bitmap_nr = load_block_bitmap (mp, i);
x = ext2_count_free (sb->s_block_bitmap[bitmap_nr],
bitmap_nr = load_block_bitmap (sb, i);
x = ext2_count_free (sb->u.ext2_sb.s_block_bitmap[bitmap_nr],
sb->s_blocksize);
ext2_debug ("group %d: stored = %d, counted = %lu\n",
printk ("group %d: stored = %d, counted = %lu\n",
i, gdp->bg_free_blocks_count, x);
bitmap_count += x;
}
ext2_debug( "stored = %lu, computed = %lu, %lu\n",
printk("ext2_count_free_blocks: stored = %lu, computed = %lu, %lu\n",
es->s_free_blocks_count, desc_count, bitmap_count);
unlock_super (VFSTOUFS(mp)->um_devvp);
unlock_super (sb);
return bitmap_count;
#else
return sb->s_es->s_free_blocks_count;
return sb->u.ext2_sb.s_es->s_free_blocks_count;
#endif
}
static inline int block_in_use (unsigned long block,
struct ext2_sb_info * sb,
struct super_block * sb,
unsigned char * map)
{
return test_bit ((block - sb->s_es->s_first_data_block) %
return test_bit ((block - sb->u.ext2_sb.s_es->s_first_data_block) %
EXT2_BLOCKS_PER_GROUP(sb), map);
}
void ext2_check_blocks_bitmap (struct mount * mp)
void ext2_check_blocks_bitmap (struct super_block * sb)
{
struct ext2_sb_info *sb = VFSTOUFS(mp)->um_e2fs;
struct buffer_head * bh;
struct ext2_super_block * es;
unsigned long desc_count, bitmap_count, x;
@ -505,78 +527,57 @@ void ext2_check_blocks_bitmap (struct mount * mp)
struct ext2_group_desc * gdp;
int i, j;
lock_super (VFSTOUFS(mp)->um_devvp);
es = sb->s_es;
lock_super (sb);
es = sb->u.ext2_sb.s_es;
desc_count = 0;
bitmap_count = 0;
gdp = NULL;
desc_blocks = (sb->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
desc_blocks = (sb->u.ext2_sb.s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
EXT2_DESC_PER_BLOCK(sb);
for (i = 0; i < sb->s_groups_count; i++) {
gdp = get_group_desc (mp, i, NULL);
for (i = 0; i < sb->u.ext2_sb.s_groups_count; i++) {
gdp = get_group_desc (sb, i, NULL);
desc_count += gdp->bg_free_blocks_count;
bitmap_nr = load_block_bitmap (mp, i);
bh = sb->s_block_bitmap[bitmap_nr];
bitmap_nr = load_block_bitmap (sb, i);
bh = sb->u.ext2_sb.s_block_bitmap[bitmap_nr];
if (!test_bit (0, bh->b_data))
printf ( "ext2_check_blocks_bitmap: "
ext2_error (sb, "ext2_check_blocks_bitmap",
"Superblock in group %d is marked free", i);
for (j = 0; j < desc_blocks; j++)
if (!test_bit (j + 1, bh->b_data))
printf ("ext2_check_blocks_bitmap: "
ext2_error (sb, "ext2_check_blocks_bitmap",
"Descriptor block #%d in group "
"%d is marked free", j, i);
if (!block_in_use (gdp->bg_block_bitmap, sb, bh->b_data))
printf ("ext2_check_blocks_bitmap: "
ext2_error (sb, "ext2_check_blocks_bitmap",
"Block bitmap for group %d is marked free",
i);
if (!block_in_use (gdp->bg_inode_bitmap, sb, bh->b_data))
printf ("ext2_check_blocks_bitmap: "
ext2_error (sb, "ext2_check_blocks_bitmap",
"Inode bitmap for group %d is marked free",
i);
for (j = 0; j < sb->s_itb_per_group; j++)
for (j = 0; j < sb->u.ext2_sb.s_itb_per_group; j++)
if (!block_in_use (gdp->bg_inode_table + j, sb, bh->b_data))
printf ("ext2_check_blocks_bitmap: "
ext2_error (sb, "ext2_check_blocks_bitmap",
"Block #%d of the inode table in "
"group %d is marked free", j, i);
x = ext2_count_free (bh, sb->s_blocksize);
if (gdp->bg_free_blocks_count != x)
printf ("ext2_check_blocks_bitmap: "
ext2_error (sb, "ext2_check_blocks_bitmap",
"Wrong free blocks count for group %d, "
"stored = %d, counted = %lu", i,
gdp->bg_free_blocks_count, x);
bitmap_count += x;
}
if (es->s_free_blocks_count != bitmap_count)
printf ("ext2_check_blocks_bitmap: "
ext2_error (sb, "ext2_check_blocks_bitmap",
"Wrong free blocks count in super block, "
"stored = %lu, counted = %lu",
(unsigned long) es->s_free_blocks_count, bitmap_count);
unlock_super (VFSTOUFS(mp)->um_devvp);
unlock_super (sb);
}
/*
* this function is taken from
* linux/fs/ext2/bitmap.c
*/
static int nibblemap[] = {4, 3, 3, 2, 3, 2, 2, 1, 3, 2, 2, 1, 2, 1, 1, 0};
unsigned long ext2_count_free (struct buffer_head * map, unsigned int numchars)
{
unsigned int i;
unsigned long sum = 0;
if (!map)
return (0);
for (i = 0; i < numchars; i++)
sum += nibblemap[map->b_data[i] & 0xf] +
nibblemap[(map->b_data[i] >> 4) & 0xf];
return (sum);
}

423
sys/gnu/ext2fs/ext2_linux_ialloc.c
View File

@ -1,9 +1,3 @@
/*
* modified for Lites 1.1
*
* Aug 1995, Godmar Back (gback@cs.utah.edu)
* University of Utah, Department of Computer Science
*/
/*
* linux/fs/ext2/ialloc.c
*
@ -16,6 +10,10 @@
* Stephen Tweedie (sct@dcs.ed.ac.uk), 1993
*/
/*
* ialloc.c contains the inodes allocation and deallocation routines
*/
/*
* The free inodes are managed by bitmaps. A file system contains several
* blocks groups. Each group contains 1 bitmap block for blocks, 1 bitmap
@ -27,99 +25,59 @@
* when a file system is mounted (see ext2_read_super).
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <linux/fs.h>
#include <linux/ext2_fs.h>
#include <linux/sched.h>
#include <linux/stat.h>
#include <linux/string.h>
#include <linux/locks.h>
#include <ufs/ufs/quota.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/ufsmount.h>
#include <gnu/ext2fs/ext2_fs.h>
#include <gnu/ext2fs/ext2_fs_sb.h>
#include <gnu/ext2fs/fs.h>
#include <sys/stat.h>
#include <asm/bitops.h>
#if (i386)
#include <gnu/ext2fs/i386-bitops.h>
#else
#error please provide bit operation functions
#endif
/* this is supposed to mark a buffer dirty on ready for delayed writing
*/
void mark_buffer_dirty(struct buf *bh)
{
bh->b_flags |= B_DELWRI;
bh->b_flags &= ~(B_READ | B_ERROR);
}
/*
this should write a buffer immediately w/o releasing it
*/
int ll_w_block(struct buf * bp, int waitfor)
{
bp->b_flags &= ~(B_READ|B_DONE|B_ERROR|B_DELWRI);
bp->b_flags |= B_WRITEINPROG;
bp->b_vp->v_numoutput++;
#if defined(__FreeBSD__)
vfs_busy_pages(bp, 1);
#endif
VOP_STRATEGY(bp);
return waitfor ? biowait(bp) : 0;
}
struct ext2_group_desc * get_group_desc (struct mount * mp,
static struct ext2_group_desc * get_group_desc (struct super_block * sb,
unsigned int block_group,
struct buffer_head ** bh)
{
struct ext2_sb_info *sb = VFSTOUFS(mp)->um_e2fs;
unsigned long group_desc;
unsigned long desc;
struct ext2_group_desc * gdp;
if (block_group >= sb->s_groups_count)
panic ("get_group_desc: "
if (block_group >= sb->u.ext2_sb.s_groups_count)
ext2_panic (sb, "get_group_desc",
"block_group >= groups_count - "
"block_group = %d, groups_count = %lu",
block_group, sb->s_groups_count);
block_group, sb->u.ext2_sb.s_groups_count);
group_desc = block_group / EXT2_DESC_PER_BLOCK(sb);
desc = block_group % EXT2_DESC_PER_BLOCK(sb);
if (!sb->s_group_desc[group_desc])
panic ( "get_group_desc:"
if (!sb->u.ext2_sb.s_group_desc[group_desc])
ext2_panic (sb, "get_group_desc",
"Group descriptor not loaded - "
"block_group = %d, group_desc = %lu, desc = %lu",
block_group, group_desc, desc);
gdp = (struct ext2_group_desc *)
sb->s_group_desc[group_desc]->b_data;
sb->u.ext2_sb.s_group_desc[group_desc]->b_data;
if (bh)
*bh = sb->s_group_desc[group_desc];
*bh = sb->u.ext2_sb.s_group_desc[group_desc];
return gdp + desc;
}
static void read_inode_bitmap (struct mount * mp,
static void read_inode_bitmap (struct super_block * sb,
unsigned long block_group,
unsigned int bitmap_nr)
{
struct ext2_sb_info *sb = VFSTOUFS(mp)->um_e2fs;
struct ext2_group_desc * gdp;
struct buffer_head * bh;
int error;
gdp = get_group_desc (mp, block_group, NULL);
if (error = bread (VFSTOUFS(mp)->um_devvp,
fsbtodb(sb, gdp->bg_inode_bitmap),
sb->s_blocksize,
NOCRED, &bh))
panic ( "read_inode_bitmap:"
gdp = get_group_desc (sb, block_group, NULL);
bh = bread (sb->s_dev, gdp->bg_inode_bitmap, sb->s_blocksize);
if (!bh)
ext2_panic (sb, "read_inode_bitmap",
"Cannot read inode bitmap - "
"block_group = %lu, inode_bitmap = %lu",
block_group, (unsigned long) gdp->bg_inode_bitmap);
sb->s_inode_bitmap_number[bitmap_nr] = block_group;
sb->s_inode_bitmap[bitmap_nr] = bh;
sb->u.ext2_sb.s_inode_bitmap_number[bitmap_nr] = block_group;
sb->u.ext2_sb.s_inode_bitmap[bitmap_nr] = bh;
}
/*
@ -133,72 +91,104 @@ static void read_inode_bitmap (struct mount * mp,
* 2/ If the file system contains less than EXT2_MAX_GROUP_LOADED groups,
* this function reads the bitmap without maintaining a LRU cache.
*/
static int load_inode_bitmap (struct mount * mp,
static int load_inode_bitmap (struct super_block * sb,
unsigned int block_group)
{
struct ext2_sb_info *sb = VFSTOUFS(mp)->um_e2fs;
int i, j;
unsigned long inode_bitmap_number;
struct buffer_head * inode_bitmap;
if (block_group >= sb->s_groups_count)
panic ("load_inode_bitmap:"
if (block_group >= sb->u.ext2_sb.s_groups_count)
ext2_panic (sb, "load_inode_bitmap",
"block_group >= groups_count - "
"block_group = %d, groups_count = %lu",
block_group, sb->s_groups_count);
if (sb->s_loaded_inode_bitmaps > 0 &&
sb->s_inode_bitmap_number[0] == block_group)
block_group, sb->u.ext2_sb.s_groups_count);
if (sb->u.ext2_sb.s_loaded_inode_bitmaps > 0 &&
sb->u.ext2_sb.s_inode_bitmap_number[0] == block_group)
return 0;
if (sb->s_groups_count <= EXT2_MAX_GROUP_LOADED) {
if (sb->s_inode_bitmap[block_group]) {
if (sb->s_inode_bitmap_number[block_group] !=
block_group)
panic ( "load_inode_bitmap:"
if (sb->u.ext2_sb.s_groups_count <= EXT2_MAX_GROUP_LOADED) {
if (sb->u.ext2_sb.s_inode_bitmap[block_group]) {
if (sb->u.ext2_sb.s_inode_bitmap_number[block_group] != block_group)
ext2_panic (sb, "load_inode_bitmap",
"block_group != inode_bitmap_number");
else
return block_group;
} else {
read_inode_bitmap (mp, block_group, block_group);
read_inode_bitmap (sb, block_group, block_group);
return block_group;
}
}
for (i = 0; i < sb->s_loaded_inode_bitmaps &&
sb->s_inode_bitmap_number[i] != block_group;
for (i = 0; i < sb->u.ext2_sb.s_loaded_inode_bitmaps &&
sb->u.ext2_sb.s_inode_bitmap_number[i] != block_group;
i++)
;
if (i < sb->s_loaded_inode_bitmaps &&
sb->s_inode_bitmap_number[i] == block_group) {
inode_bitmap_number = sb->s_inode_bitmap_number[i];
inode_bitmap = sb->s_inode_bitmap[i];
if (i < sb->u.ext2_sb.s_loaded_inode_bitmaps &&
sb->u.ext2_sb.s_inode_bitmap_number[i] == block_group) {
inode_bitmap_number = sb->u.ext2_sb.s_inode_bitmap_number[i];
inode_bitmap = sb->u.ext2_sb.s_inode_bitmap[i];
for (j = i; j > 0; j--) {
sb->s_inode_bitmap_number[j] =
sb->s_inode_bitmap_number[j - 1];
sb->s_inode_bitmap[j] =
sb->s_inode_bitmap[j - 1];
sb->u.ext2_sb.s_inode_bitmap_number[j] =
sb->u.ext2_sb.s_inode_bitmap_number[j - 1];
sb->u.ext2_sb.s_inode_bitmap[j] =
sb->u.ext2_sb.s_inode_bitmap[j - 1];
}
sb->s_inode_bitmap_number[0] = inode_bitmap_number;
sb->s_inode_bitmap[0] = inode_bitmap;
sb->u.ext2_sb.s_inode_bitmap_number[0] = inode_bitmap_number;
sb->u.ext2_sb.s_inode_bitmap[0] = inode_bitmap;
} else {
if (sb->s_loaded_inode_bitmaps < EXT2_MAX_GROUP_LOADED)
sb->s_loaded_inode_bitmaps++;
if (sb->u.ext2_sb.s_loaded_inode_bitmaps < EXT2_MAX_GROUP_LOADED)
sb->u.ext2_sb.s_loaded_inode_bitmaps++;
else
brelse (sb->s_inode_bitmap[EXT2_MAX_GROUP_LOADED - 1]);
for (j = sb->s_loaded_inode_bitmaps - 1; j > 0; j--) {
sb->s_inode_bitmap_number[j] =
sb->s_inode_bitmap_number[j - 1];
sb->s_inode_bitmap[j] =
sb->s_inode_bitmap[j - 1];
brelse (sb->u.ext2_sb.s_inode_bitmap[EXT2_MAX_GROUP_LOADED - 1]);
for (j = sb->u.ext2_sb.s_loaded_inode_bitmaps - 1; j > 0; j--) {
sb->u.ext2_sb.s_inode_bitmap_number[j] =
sb->u.ext2_sb.s_inode_bitmap_number[j - 1];
sb->u.ext2_sb.s_inode_bitmap[j] =
sb->u.ext2_sb.s_inode_bitmap[j - 1];
}
read_inode_bitmap (mp, block_group, 0);
read_inode_bitmap (sb, block_group, 0);
}
return 0;
}
/*
* This function sets the deletion time for the inode
*
* This may be used one day by an 'undelete' program
*/
static void set_inode_dtime (struct inode * inode,
struct ext2_group_desc * gdp)
{
unsigned long inode_block;
struct buffer_head * bh;
struct ext2_inode * raw_inode;
inode_block = gdp->bg_inode_table + (((inode->i_ino - 1) %
EXT2_INODES_PER_GROUP(inode->i_sb)) /
EXT2_INODES_PER_BLOCK(inode->i_sb));
bh = bread (inode->i_sb->s_dev, inode_block, inode->i_sb->s_blocksize);
if (!bh)
ext2_panic (inode->i_sb, "set_inode_dtime",
"Cannot load inode table block - "
"inode=%lu, inode_block=%lu",
inode->i_ino, inode_block);
raw_inode = ((struct ext2_inode *) bh->b_data) +
(((inode->i_ino - 1) %
EXT2_INODES_PER_GROUP(inode->i_sb)) %
EXT2_INODES_PER_BLOCK(inode->i_sb));
raw_inode->i_links_count = 0;
raw_inode->i_dtime = CURRENT_TIME;
mark_buffer_dirty(bh, 1);
if (IS_SYNC(inode)) {
ll_rw_block (WRITE, 1, &bh);
wait_on_buffer (bh);
}
brelse (bh);
}
void ext2_free_inode (struct inode * inode)
{
struct ext2_sb_info * sb;
struct super_block * sb;
struct buffer_head * bh;
struct buffer_head * bh2;
unsigned long block_group;
@ -209,51 +199,65 @@ void ext2_free_inode (struct inode * inode)
if (!inode)
return;
if (!inode->i_dev) {
printk ("ext2_free_inode: inode has no device\n");
return;
}
if (inode->i_count > 1) {
printk ("ext2_free_inode: inode has count=%d\n",
inode->i_count);
return;
}
if (inode->i_nlink) {
printf ("ext2_free_inode: inode has nlink=%d\n",
printk ("ext2_free_inode: inode has nlink=%d\n",
inode->i_nlink);
return;
}
ext2_debug ("freeing inode %lu\n", inode->i_number);
sb = inode->i_e2fs;
lock_super (DEVVP(inode));
if (inode->i_number < EXT2_FIRST_INO ||
inode->i_number > sb->s_es->s_inodes_count) {
printf ("free_inode reserved inode or nonexistent inode");
unlock_super (DEVVP(inode));
if (!inode->i_sb) {
printk("ext2_free_inode: inode on nonexistent device\n");
return;
}
es = sb->s_es;
block_group = (inode->i_number - 1) / EXT2_INODES_PER_GROUP(sb);
bit = (inode->i_number - 1) % EXT2_INODES_PER_GROUP(sb);
bitmap_nr = load_inode_bitmap (ITOV(inode)->v_mount, block_group);
bh = sb->s_inode_bitmap[bitmap_nr];
ext2_debug ("freeing inode %lu\n", inode->i_ino);
sb = inode->i_sb;
lock_super (sb);
if (inode->i_ino < EXT2_FIRST_INO ||
inode->i_ino > sb->u.ext2_sb.s_es->s_inodes_count) {
ext2_error (sb, "free_inode",
"reserved inode or nonexistent inode");
unlock_super (sb);
return;
}
es = sb->u.ext2_sb.s_es;
block_group = (inode->i_ino - 1) / EXT2_INODES_PER_GROUP(sb);
bit = (inode->i_ino - 1) % EXT2_INODES_PER_GROUP(sb);
bitmap_nr = load_inode_bitmap (sb, block_group);
bh = sb->u.ext2_sb.s_inode_bitmap[bitmap_nr];
if (!clear_bit (bit, bh->b_data))
printf ( "ext2_free_inode:"
"bit already cleared for inode %lu", inode->i_number);
ext2_warning (sb, "ext2_free_inode",
"bit already cleared for inode %lu", inode->i_ino);
else {
gdp = get_group_desc (ITOV(inode)->v_mount, block_group, &bh2);
gdp = get_group_desc (sb, block_group, &bh2);
gdp->bg_free_inodes_count++;
if (S_ISDIR(inode->i_mode))
gdp->bg_used_dirs_count--;
mark_buffer_dirty(bh2);
mark_buffer_dirty(bh2, 1);
es->s_free_inodes_count++;
mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
set_inode_dtime (inode, gdp);
}
mark_buffer_dirty(bh);
/*** XXX
mark_buffer_dirty(bh, 1);
if (sb->s_flags & MS_SYNCHRONOUS) {
ll_rw_block (WRITE, 1, &bh);
wait_on_buffer (bh);
}
***/
sb->s_dirt = 1;
unlock_super (DEVVP(inode));
clear_inode (inode);
unlock_super (sb);
}
#if linux
/*
* This function increments the inode version number
*
@ -267,19 +271,20 @@ static void inc_inode_version (struct inode * inode,
struct buffer_head * bh;
struct ext2_inode * raw_inode;
inode_block = gdp->bg_inode_table + (((inode->i_number - 1) %
inode_block = gdp->bg_inode_table + (((inode->i_ino - 1) %
EXT2_INODES_PER_GROUP(inode->i_sb)) /
EXT2_INODES_PER_BLOCK(inode->i_sb));
bh = bread (inode->i_sb->s_dev, inode_block, inode->i_sb->s_blocksize);
if (!bh) {
printf ("inc_inode_version Cannot load inode table block - "
ext2_error (inode->i_sb, "inc_inode_version",
"Cannot load inode table block - "
"inode=%lu, inode_block=%lu\n",
inode->i_number, inode_block);
inode->i_ino, inode_block);
inode->u.ext2_i.i_version = 1;
return;
}
raw_inode = ((struct ext2_inode *) bh->b_data) +
(((inode->i_number - 1) %
(((inode->i_ino - 1) %
EXT2_INODES_PER_GROUP(inode->i_sb)) %
EXT2_INODES_PER_BLOCK(inode->i_sb));
raw_inode->i_version++;
@ -288,8 +293,6 @@ static void inc_inode_version (struct inode * inode,
brelse (bh);
}
#endif /* linux */
/*
* There are two policies for allocating an inode. If the new inode is
* a directory, then a forward search is made for a block group with both
@ -300,32 +303,31 @@ static void inc_inode_version (struct inode * inode,
* For other inodes, search forward from the parent directory\'s block
* group to find a free inode.
*/
/*
* this functino has been reduced to the actual 'find the inode number' part
*/
ino_t ext2_new_inode (const struct inode * dir, int mode)
struct inode * ext2_new_inode (const struct inode * dir, int mode)
{
struct ext2_sb_info * sb;
struct super_block * sb;
struct buffer_head * bh;
struct buffer_head * bh2;
int i, j, avefreei;
struct inode * inode;
int bitmap_nr;
struct ext2_group_desc * gdp;
struct ext2_group_desc * tmp;
struct ext2_super_block * es;
if (!dir)
return 0;
sb = dir->i_e2fs;
lock_super (DEVVP(dir));
es = sb->s_es;
if (!dir || !(inode = get_empty_inode ()))
return NULL;
sb = dir->i_sb;
inode->i_sb = sb;
inode->i_flags = sb->s_flags;
lock_super (sb);
es = sb->u.ext2_sb.s_es;
repeat:
gdp = NULL; i=0;
if (S_ISDIR(mode)) {
avefreei = es->s_free_inodes_count /
sb->s_groups_count;
sb->u.ext2_sb.s_groups_count;
/* I am not yet convinced that this next bit is necessary.
i = dir->u.ext2_i.i_block_group;
for (j = 0; j < sb->u.ext2_sb.s_groups_count; j++) {
@ -340,8 +342,8 @@ repeat:
}
*/
if (!gdp) {
for (j = 0; j < sb->s_groups_count; j++) {
tmp = get_group_desc(ITOV(dir)->v_mount,j,&bh2);
for (j = 0; j < sb->u.ext2_sb.s_groups_count; j++) {
tmp = get_group_desc (sb, j, &bh2);
if (tmp->bg_free_inodes_count &&
tmp->bg_free_inodes_count >= avefreei) {
if (!gdp ||
@ -359,8 +361,8 @@ repeat:
/*
* Try to place the inode in its parent directory
*/
i = dir->i_block_group;
tmp = get_group_desc (ITOV(dir)->v_mount, i, &bh2);
i = dir->u.ext2_i.i_block_group;
tmp = get_group_desc (sb, i, &bh2);
if (tmp->bg_free_inodes_count)
gdp = tmp;
else
@ -369,11 +371,11 @@ repeat:
* Use a quadratic hash to find a group with a
* free inode
*/
for (j = 1; j < sb->s_groups_count; j <<= 1) {
for (j = 1; j < sb->u.ext2_sb.s_groups_count; j <<= 1) {
i += j;
if (i >= sb->s_groups_count)
i -= sb->s_groups_count;
tmp = get_group_desc(ITOV(dir)->v_mount,i,&bh2);
if (i >= sb->u.ext2_sb.s_groups_count)
i -= sb->u.ext2_sb.s_groups_count;
tmp = get_group_desc (sb, i, &bh2);
if (tmp->bg_free_inodes_count) {
gdp = tmp;
break;
@ -384,11 +386,11 @@ repeat:
/*
* That failed: try linear search for a free inode
*/
i = dir->i_block_group + 1;
for (j = 2; j < sb->s_groups_count; j++) {
if (++i >= sb->s_groups_count)
i = dir->u.ext2_i.i_block_group + 1;
for (j = 2; j < sb->u.ext2_sb.s_groups_count; j++) {
if (++i >= sb->u.ext2_sb.s_groups_count)
i = 0;
tmp = get_group_desc(ITOV(dir)->v_mount,i,&bh2);
tmp = get_group_desc (sb, i, &bh2);
if (tmp->bg_free_inodes_count) {
gdp = tmp;
break;
@ -398,92 +400,127 @@ repeat:
}
if (!gdp) {
unlock_super (DEVVP(dir));
return 0;
unlock_super (sb);
iput(inode);
return NULL;
}
bitmap_nr = load_inode_bitmap (ITOV(dir)->v_mount, i);
bh = sb->s_inode_bitmap[bitmap_nr];
bitmap_nr = load_inode_bitmap (sb, i);
bh = sb->u.ext2_sb.s_inode_bitmap[bitmap_nr];
if ((j = find_first_zero_bit ((unsigned long *) bh->b_data,
EXT2_INODES_PER_GROUP(sb))) <
EXT2_INODES_PER_GROUP(sb)) {
if (set_bit (j, bh->b_data)) {
printf ( "ext2_new_inode:"
ext2_warning (sb, "ext2_new_inode",
"bit already set for inode %d", j);
goto repeat;
}
/* Linux now does the following:
mark_buffer_dirty(bh, 1);
if (sb->s_flags & MS_SYNCHRONOUS) {
ll_rw_block (WRITE, 1, &bh);
wait_on_buffer (bh);
}
*/
mark_buffer_dirty(bh);
} else {
if (gdp->bg_free_inodes_count != 0) {
printf ( "ext2_new_inode:"
ext2_error (sb, "ext2_new_inode",
"Free inodes count corrupted in group %d",
i);
unlock_super (DEVVP(dir));
return 0;
unlock_super (sb);
iput (inode);
return NULL;
}
goto repeat;
}
j += i * EXT2_INODES_PER_GROUP(sb) + 1;
if (j < EXT2_FIRST_INO || j > es->s_inodes_count) {
printf ( "ext2_new_inode:"
ext2_error (sb, "ext2_new_inode",
"reserved inode or inode > inodes count - "
"block_group = %d,inode=%d", i, j);
unlock_super (DEVVP(dir));
return 0;
unlock_super (sb);
iput (inode);
return NULL;
}
gdp->bg_free_inodes_count--;
if (S_ISDIR(mode))
gdp->bg_used_dirs_count++;
mark_buffer_dirty(bh2);
mark_buffer_dirty(bh2, 1);
es->s_free_inodes_count--;
/* mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1); */
mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
sb->s_dirt = 1;
unlock_super (DEVVP(dir));
return j;
inode->i_mode = mode;
inode->i_sb = sb;
inode->i_count = 1;
inode->i_nlink = 1;
inode->i_dev = sb->s_dev;
inode->i_uid = current->fsuid;
if (test_opt (sb, GRPID))
inode->i_gid = dir->i_gid;
else if (dir->i_mode & S_ISGID) {
inode->i_gid = dir->i_gid;
if (S_ISDIR(mode))
mode |= S_ISGID;
} else
inode->i_gid = current->fsgid;
inode->i_dirt = 1;
inode->i_ino = j;
inode->i_blksize = sb->s_blocksize;
inode->i_blocks = 0;
inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
inode->u.ext2_i.i_flags = dir->u.ext2_i.i_flags;
if (S_ISLNK(mode))
inode->u.ext2_i.i_flags &= ~(EXT2_IMMUTABLE_FL | EXT2_APPEND_FL);
inode->u.ext2_i.i_faddr = 0;
inode->u.ext2_i.i_frag_no = 0;
inode->u.ext2_i.i_frag_size = 0;
inode->u.ext2_i.i_file_acl = 0;
inode->u.ext2_i.i_dir_acl = 0;
inode->u.ext2_i.i_dtime = 0;
inode->u.ext2_i.i_block_group = i;
inode->i_op = NULL;
if (inode->u.ext2_i.i_flags & EXT2_SYNC_FL)
inode->i_flags |= MS_SYNCHRONOUS;
insert_inode_hash(inode);
inc_inode_version (inode, gdp, mode);
ext2_debug ("allocating inode %lu\n", inode->i_ino);
unlock_super (sb);
return inode;
}
unsigned long ext2_count_free_inodes (struct mount * mp)
unsigned long ext2_count_free_inodes (struct super_block * sb)
{
#ifdef EXT2FS_DEBUG
struct ext2_sb_info *sb = VFSTOUFS(mp)->um_e2fs;
struct ext2_super_block * es;
unsigned long desc_count, bitmap_count, x;
int bitmap_nr;
struct ext2_group_desc * gdp;
int i;
lock_super (VFSTOUFS(mp)->um_devvp);
es = sb->s_es;
lock_super (sb);
es = sb->u.ext2_sb.s_es;
desc_count = 0;
bitmap_count = 0;
gdp = NULL;
for (i = 0; i < sb->s_groups_count; i++) {
gdp = get_group_desc (mp, i, NULL);
for (i = 0; i < sb->u.ext2_sb.s_groups_count; i++) {
gdp = get_group_desc (sb, i, NULL);
desc_count += gdp->bg_free_inodes_count;
bitmap_nr = load_inode_bitmap (mp, i);
x = ext2_count_free (sb->s_inode_bitmap[bitmap_nr],
bitmap_nr = load_inode_bitmap (sb, i);
x = ext2_count_free (sb->u.ext2_sb.s_inode_bitmap[bitmap_nr],
EXT2_INODES_PER_GROUP(sb) / 8);
ext2_debug ("group %d: stored = %d, counted = %lu\n",
printk ("group %d: stored = %d, counted = %lu\n",
i, gdp->bg_free_inodes_count, x);
bitmap_count += x;
}
ext2_debug("stored = %lu, computed = %lu, %lu\n",
printk("ext2_count_free_inodes: stored = %lu, computed = %lu, %lu\n",
es->s_free_inodes_count, desc_count, bitmap_count);
unlock_super (VFSTOUFS(mp)->um_devvp);
unlock_super (sb);
return desc_count;
#else
return VFSTOUFS(mp)->um_e2fsb->s_free_inodes_count;
return sb->u.ext2_sb.s_es->s_free_inodes_count;
#endif
}
#ifdef LATER
void ext2_check_inodes_bitmap (struct mount * mp)
void ext2_check_inodes_bitmap (struct super_block * sb)
{
struct ext2_super_block * es;
unsigned long desc_count, bitmap_count, x;
@ -503,18 +540,16 @@ void ext2_check_inodes_bitmap (struct mount * mp)
x = ext2_count_free (sb->u.ext2_sb.s_inode_bitmap[bitmap_nr],
EXT2_INODES_PER_GROUP(sb) / 8);
if (gdp->bg_free_inodes_count != x)
printf ( "ext2_check_inodes_bitmap:"
ext2_error (sb, "ext2_check_inodes_bitmap",
"Wrong free inodes count in group %d, "
"stored = %d, counted = %lu", i,
gdp->bg_free_inodes_count, x);
bitmap_count += x;
}
if (es->s_free_inodes_count != bitmap_count)
printf ( "ext2_check_inodes_bitmap:"
ext2_error (sb, "ext2_check_inodes_bitmap",
"Wrong free inodes count in super block, "
"stored = %lu, counted = %lu",
(unsigned long) es->s_free_inodes_count, bitmap_count);
unlock_super (sb);
}
#endif

780
sys/gnu/ext2fs/ext2_super.c Normal file
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@ -0,0 +1,780 @@
/*
* linux/fs/ext2/super.c
*
* Copyright (C) 1992, 1993, 1994, 1995
* Remy Card (card@masi.ibp.fr)
* Laboratoire MASI - Institut Blaise Pascal
* Universite Pierre et Marie Curie (Paris VI)
*
* from
*
* linux/fs/minix/inode.c
*
* Copyright (C) 1991, 1992 Linus Torvalds
*/
#include <stdarg.h>
#include <asm/segment.h>
#include <asm/system.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/ext2_fs.h>
#include <linux/malloc.h>
#include <linux/sched.h>
#include <linux/stat.h>
#include <linux/string.h>
#include <linux/locks.h>
static char error_buf[1024];
void ext2_error (struct super_block * sb, const char * function,
const char * fmt, ...)
{
va_list args;
if (!(sb->s_flags & MS_RDONLY)) {
sb->u.ext2_sb.s_mount_state |= EXT2_ERROR_FS;
sb->u.ext2_sb.s_es->s_state |= EXT2_ERROR_FS;
mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
sb->s_dirt = 1;
}
va_start (args, fmt);
vsprintf (error_buf, fmt, args);
va_end (args);
if (test_opt (sb, ERRORS_PANIC) ||
(sb->u.ext2_sb.s_es->s_errors == EXT2_ERRORS_PANIC &&
!test_opt (sb, ERRORS_CONT) && !test_opt (sb, ERRORS_RO)))
panic ("EXT2-fs panic (device %d/%d): %s: %s\n",
MAJOR(sb->s_dev), MINOR(sb->s_dev), function, error_buf);
printk (KERN_CRIT "EXT2-fs error (device %d/%d): %s: %s\n",
MAJOR(sb->s_dev), MINOR(sb->s_dev), function, error_buf);
if (test_opt (sb, ERRORS_RO) ||
(sb->u.ext2_sb.s_es->s_errors == EXT2_ERRORS_RO &&
!test_opt (sb, ERRORS_CONT) && !test_opt (sb, ERRORS_PANIC))) {
printk ("Remounting filesystem read-only\n");
sb->s_flags |= MS_RDONLY;
}
}
NORET_TYPE void ext2_panic (struct super_block * sb, const char * function,
const char * fmt, ...)
{
va_list args;
if (!(sb->s_flags & MS_RDONLY)) {
sb->u.ext2_sb.s_mount_state |= EXT2_ERROR_FS;
sb->u.ext2_sb.s_es->s_state |= EXT2_ERROR_FS;
mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
sb->s_dirt = 1;
}
va_start (args, fmt);
vsprintf (error_buf, fmt, args);
va_end (args);
panic ("EXT2-fs panic (device %d/%d): %s: %s\n",
MAJOR(sb->s_dev), MINOR(sb->s_dev), function, error_buf);
}
void ext2_warning (struct super_block * sb, const char * function,
const char * fmt, ...)
{
va_list args;
va_start (args, fmt);
vsprintf (error_buf, fmt, args);
va_end (args);
printk (KERN_WARNING "EXT2-fs warning (device %d/%d): %s: %s\n",
MAJOR(sb->s_dev), MINOR(sb->s_dev), function, error_buf);
}
void ext2_put_super (struct super_block * sb)
{
int db_count;
int i;
lock_super (sb);
if (!(sb->s_flags & MS_RDONLY)) {
sb->u.ext2_sb.s_es->s_state = sb->u.ext2_sb.s_mount_state;
mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
}
sb->s_dev = 0;
db_count = sb->u.ext2_sb.s_db_per_group;
for (i = 0; i < db_count; i++)
if (sb->u.ext2_sb.s_group_desc[i])
brelse (sb->u.ext2_sb.s_group_desc[i]);
kfree_s (sb->u.ext2_sb.s_group_desc,
db_count * sizeof (struct buffer_head *));
for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
if (sb->u.ext2_sb.s_inode_bitmap[i])
brelse (sb->u.ext2_sb.s_inode_bitmap[i]);
for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++)
if (sb->u.ext2_sb.s_block_bitmap[i])
brelse (sb->u.ext2_sb.s_block_bitmap[i]);
brelse (sb->u.ext2_sb.s_sbh);
unlock_super (sb);
return;
}
static struct super_operations ext2_sops = {
ext2_read_inode,
NULL,
ext2_write_inode,
ext2_put_inode,
ext2_put_super,
ext2_write_super,
ext2_statfs,
ext2_remount
};
#ifdef EXT2FS_PRE_02B_COMPAT
static int convert_pre_02b_fs (struct super_block * sb,
struct buffer_head * bh)
{
struct ext2_super_block * es;
struct ext2_old_group_desc old_group_desc [BLOCK_SIZE / sizeof (struct ext2_old_group_desc)];
struct ext2_group_desc * gdp;
struct buffer_head * bh2;
int groups_count;
int i;
es = (struct ext2_super_block *) bh->b_data;
bh2 = bread (sb->s_dev, 2, BLOCK_SIZE);
if (!bh2) {
printk ("Cannot read descriptor blocks while converting !\n");
return 0;
}
memcpy (old_group_desc, bh2->b_data, BLOCK_SIZE);
groups_count = (sb->u.ext2_sb.s_blocks_count -
sb->u.ext2_sb.s_first_data_block +
(EXT2_BLOCK_SIZE(sb) * 8) - 1) /
(EXT2_BLOCK_SIZE(sb) * 8);
memset (bh2->b_data, 0, BLOCK_SIZE);
gdp = (struct ext2_group_desc *) bh2->b_data;
for (i = 0; i < groups_count; i++) {
gdp[i].bg_block_bitmap = old_group_desc[i].bg_block_bitmap;
gdp[i].bg_inode_bitmap = old_group_desc[i].bg_inode_bitmap;
gdp[i].bg_inode_table = old_group_desc[i].bg_inode_table;
gdp[i].bg_free_blocks_count = old_group_desc[i].bg_free_blocks_count;
gdp[i].bg_free_inodes_count = old_group_desc[i].bg_free_inodes_count;
}
mark_buffer_dirty(bh2, 1);
brelse (bh2);
es->s_magic = EXT2_SUPER_MAGIC;
mark_buffer_dirty(bh, 1);
sb->s_magic = EXT2_SUPER_MAGIC;
return 1;
}
#endif
/*
* This function has been shamelessly adapted from the msdos fs
*/
static int parse_options (char * options, unsigned long * sb_block,
unsigned short *resuid, unsigned short * resgid,
unsigned long * mount_options)
{
char * this_char;
char * value;
if (!options)
return 1;
for (this_char = strtok (options, ",");
this_char != NULL;
this_char = strtok (NULL, ",")) {
if ((value = strchr (this_char, '=')) != NULL)
*value++ = 0;
if (!strcmp (this_char, "bsddf"))
clear_opt (*mount_options, MINIX_DF);
else if (!strcmp (this_char, "check")) {
if (!value || !*value)
set_opt (*mount_options, CHECK_NORMAL);
else if (!strcmp (value, "none")) {
clear_opt (*mount_options, CHECK_NORMAL);
clear_opt (*mount_options, CHECK_STRICT);
}
else if (strcmp (value, "normal"))
set_opt (*mount_options, CHECK_NORMAL);
else if (strcmp (value, "strict")) {
set_opt (*mount_options, CHECK_NORMAL);
set_opt (*mount_options, CHECK_STRICT);
}
else {
printk ("EXT2-fs: Invalid check option: %s\n",
value);
return 0;
}
}
else if (!strcmp (this_char, "debug"))
set_opt (*mount_options, DEBUG);
else if (!strcmp (this_char, "errors")) {
if (!value || !*value) {
printk ("EXT2-fs: the errors option requires "
"an argument");
return 0;
}
if (!strcmp (value, "continue")) {
clear_opt (*mount_options, ERRORS_RO);
clear_opt (*mount_options, ERRORS_PANIC);
set_opt (*mount_options, ERRORS_CONT);
}
else if (!strcmp (value, "remount-ro")) {
clear_opt (*mount_options, ERRORS_CONT);
clear_opt (*mount_options, ERRORS_PANIC);
set_opt (*mount_options, ERRORS_RO);
}
else if (!strcmp (value, "panic")) {
clear_opt (*mount_options, ERRORS_CONT);
clear_opt (*mount_options, ERRORS_RO);
set_opt (*mount_options, ERRORS_PANIC);
}
else {
printk ("EXT2-fs: Invalid errors option: %s\n",
value);
return 0;
}
}
else if (!strcmp (this_char, "grpid") ||
!strcmp (this_char, "bsdgroups"))
set_opt (*mount_options, GRPID);
else if (!strcmp (this_char, "minixdf"))
set_opt (*mount_options, MINIX_DF);
else if (!strcmp (this_char, "nocheck")) {
clear_opt (*mount_options, CHECK_NORMAL);
clear_opt (*mount_options, CHECK_STRICT);
}
else if (!strcmp (this_char, "nogrpid") ||
!strcmp (this_char, "sysvgroups"))
clear_opt (*mount_options, GRPID);
else if (!strcmp (this_char, "resgid")) {
if (!value || !*value) {
printk ("EXT2-fs: the resgid option requires "
"an argument");
return 0;
}
*resgid = simple_strtoul (value, &value, 0);
if (*value) {
printk ("EXT2-fs: Invalid resgid option: %s\n",
value);
return 0;
}
}
else if (!strcmp (this_char, "resuid")) {
if (!value || !*value) {
printk ("EXT2-fs: the resuid option requires "
"an argument");
return 0;
}
*resuid = simple_strtoul (value, &value, 0);
if (*value) {
printk ("EXT2-fs: Invalid resuid option: %s\n",
value);
return 0;
}
}
else if (!strcmp (this_char, "sb")) {
if (!value || !*value) {
printk ("EXT2-fs: the sb option requires "
"an argument");
return 0;
}
*sb_block = simple_strtoul (value, &value, 0);
if (*value) {
printk ("EXT2-fs: Invalid sb option: %s\n",
value);
return 0;
}
}
else {
printk ("EXT2-fs: Unrecognized mount option %s\n", this_char);
return 0;
}
}
return 1;
}
static void ext2_setup_super (struct super_block * sb,
struct ext2_super_block * es)
{
if (es->s_rev_level > EXT2_CURRENT_REV) {
printk ("EXT2-fs warning: revision level too high, "
"forcing read/only mode\n");
sb->s_flags |= MS_RDONLY;
}
if (!(sb->s_flags & MS_RDONLY)) {
if (!(sb->u.ext2_sb.s_mount_state & EXT2_VALID_FS))
printk ("EXT2-fs warning: mounting unchecked fs, "
"running e2fsck is recommended\n");
else if ((sb->u.ext2_sb.s_mount_state & EXT2_ERROR_FS))
printk ("EXT2-fs warning: mounting fs with errors, "
"running e2fsck is recommended\n");
else if (es->s_max_mnt_count >= 0 &&
es->s_mnt_count >= (unsigned short) es->s_max_mnt_count)
printk ("EXT2-fs warning: maximal mount count reached, "
"running e2fsck is recommended\n");
else if (es->s_checkinterval &&
(es->s_lastcheck + es->s_checkinterval <= CURRENT_TIME))
printk ("EXT2-fs warning: checktime reached, "
"running e2fsck is recommended\n");
es->s_state &= ~EXT2_VALID_FS;
if (!es->s_max_mnt_count)
es->s_max_mnt_count = EXT2_DFL_MAX_MNT_COUNT;
es->s_mnt_count++;
es->s_mtime = CURRENT_TIME;
mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
sb->s_dirt = 1;
if (test_opt (sb, DEBUG))
printk ("[EXT II FS %s, %s, bs=%lu, fs=%lu, gc=%lu, "
"bpg=%lu, ipg=%lu, mo=%04lx]\n",
EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize,
sb->u.ext2_sb.s_frag_size,
sb->u.ext2_sb.s_groups_count,
EXT2_BLOCKS_PER_GROUP(sb),
EXT2_INODES_PER_GROUP(sb),
sb->u.ext2_sb.s_mount_opt);
if (test_opt (sb, CHECK)) {
ext2_check_blocks_bitmap (sb);
ext2_check_inodes_bitmap (sb);
}
}
}
static int ext2_check_descriptors (struct super_block * sb)
{
int i;
int desc_block = 0;
unsigned long block = sb->u.ext2_sb.s_es->s_first_data_block;
struct ext2_group_desc * gdp = NULL;
ext2_debug ("Checking group descriptors");
for (i = 0; i < sb->u.ext2_sb.s_groups_count; i++)
{
if ((i % EXT2_DESC_PER_BLOCK(sb)) == 0)
gdp = (struct ext2_group_desc *) sb->u.ext2_sb.s_group_desc[desc_block++]->b_data;
if (gdp->bg_block_bitmap < block ||
gdp->bg_block_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
{
ext2_error (sb, "ext2_check_descriptors",
"Block bitmap for group %d"
" not in group (block %lu)!",
i, (unsigned long) gdp->bg_block_bitmap);
return 0;
}
if (gdp->bg_inode_bitmap < block ||
gdp->bg_inode_bitmap >= block + EXT2_BLOCKS_PER_GROUP(sb))
{
ext2_error (sb, "ext2_check_descriptors",
"Inode bitmap for group %d"
" not in group (block %lu)!",
i, (unsigned long) gdp->bg_inode_bitmap);
return 0;
}
if (gdp->bg_inode_table < block ||
gdp->bg_inode_table + sb->u.ext2_sb.s_itb_per_group >=
block + EXT2_BLOCKS_PER_GROUP(sb))
{
ext2_error (sb, "ext2_check_descriptors",
"Inode table for group %d"
" not in group (block %lu)!",
i, (unsigned long) gdp->bg_inode_table);
return 0;
}
block += EXT2_BLOCKS_PER_GROUP(sb);
gdp++;
}
return 1;
}
struct super_block * ext2_read_super (struct super_block * sb, void * data,
int silent)
{
struct buffer_head * bh;
struct ext2_super_block * es;
unsigned long sb_block = 1;
unsigned short resuid = EXT2_DEF_RESUID;
unsigned short resgid = EXT2_DEF_RESGID;
unsigned long logic_sb_block = 1;
int dev = sb->s_dev;
int db_count;
int i, j;
#ifdef EXT2FS_PRE_02B_COMPAT
int fs_converted = 0;
#endif
set_opt (sb->u.ext2_sb.s_mount_opt, CHECK_NORMAL);
if (!parse_options ((char *) data, &sb_block, &resuid, &resgid,
&sb->u.ext2_sb.s_mount_opt)) {
sb->s_dev = 0;
return NULL;
}
lock_super (sb);
set_blocksize (dev, BLOCK_SIZE);
if (!(bh = bread (dev, sb_block, BLOCK_SIZE))) {
sb->s_dev = 0;
unlock_super (sb);
printk ("EXT2-fs: unable to read superblock\n");
return NULL;
}
/*
* Note: s_es must be initialized s_es as soon as possible because
* some ext2 macro-instructions depend on its value
*/
es = (struct ext2_super_block *) bh->b_data;
sb->u.ext2_sb.s_es = es;
sb->s_magic = es->s_magic;
if (sb->s_magic != EXT2_SUPER_MAGIC
#ifdef EXT2FS_PRE_02B_COMPAT
&& sb->s_magic != EXT2_PRE_02B_MAGIC
#endif
) {
sb->s_dev = 0;
unlock_super (sb);
brelse (bh);
if (!silent)
printk ("VFS: Can't find an ext2 filesystem on dev %d/%d.\n",
MAJOR(dev), MINOR(dev));
return NULL;
}
sb->s_blocksize = EXT2_MIN_BLOCK_SIZE << es->s_log_block_size;
sb->s_blocksize_bits = EXT2_BLOCK_SIZE_BITS(sb);
if (sb->s_blocksize != BLOCK_SIZE &&
(sb->s_blocksize == 1024 || sb->s_blocksize == 2048 ||
sb->s_blocksize == 4096)) {
unsigned long offset;
brelse (bh);
set_blocksize (dev, sb->s_blocksize);
logic_sb_block = (sb_block*BLOCK_SIZE) / sb->s_blocksize;
offset = (sb_block*BLOCK_SIZE) % sb->s_blocksize;
bh = bread (dev, logic_sb_block, sb->s_blocksize);
if(!bh)
return NULL;
es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
sb->u.ext2_sb.s_es = es;
if (es->s_magic != EXT2_SUPER_MAGIC) {
sb->s_dev = 0;
unlock_super (sb);
brelse (bh);
printk ("EXT2-fs: Magic mismatch, very weird !\n");
return NULL;
}
}
sb->u.ext2_sb.s_frag_size = EXT2_MIN_FRAG_SIZE <<
es->s_log_frag_size;
if (sb->u.ext2_sb.s_frag_size)
sb->u.ext2_sb.s_frags_per_block = sb->s_blocksize /
sb->u.ext2_sb.s_frag_size;
else
sb->s_magic = 0;
sb->u.ext2_sb.s_blocks_per_group = es->s_blocks_per_group;
sb->u.ext2_sb.s_frags_per_group = es->s_frags_per_group;
sb->u.ext2_sb.s_inodes_per_group = es->s_inodes_per_group;
sb->u.ext2_sb.s_inodes_per_block = sb->s_blocksize /
sizeof (struct ext2_inode);
sb->u.ext2_sb.s_itb_per_group = sb->u.ext2_sb.s_inodes_per_group /
sb->u.ext2_sb.s_inodes_per_block;
sb->u.ext2_sb.s_desc_per_block = sb->s_blocksize /
sizeof (struct ext2_group_desc);
sb->u.ext2_sb.s_sbh = bh;
sb->u.ext2_sb.s_es = es;
if (resuid != EXT2_DEF_RESUID)
sb->u.ext2_sb.s_resuid = resuid;
else
sb->u.ext2_sb.s_resuid = es->s_def_resuid;
if (resgid != EXT2_DEF_RESGID)
sb->u.ext2_sb.s_resgid = resgid;
else
sb->u.ext2_sb.s_resgid = es->s_def_resgid;
sb->u.ext2_sb.s_mount_state = es->s_state;
sb->u.ext2_sb.s_rename_lock = 0;
sb->u.ext2_sb.s_rename_wait = NULL;
#ifdef EXT2FS_PRE_02B_COMPAT
if (sb->s_magic == EXT2_PRE_02B_MAGIC) {
if (es->s_blocks_count > 262144) {
/*
* fs > 256 MB can't be converted
*/
sb->s_dev = 0;
unlock_super (sb);
brelse (bh);
printk ("EXT2-fs: trying to mount a pre-0.2b file"
"system which cannot be converted\n");
return NULL;
}
printk ("EXT2-fs: mounting a pre 0.2b file system, "
"will try to convert the structure\n");
if (!(sb->s_flags & MS_RDONLY)) {
sb->s_dev = 0;
unlock_super (sb);
brelse (bh);
printk ("EXT2-fs: cannot convert a read-only fs\n");
return NULL;
}
if (!convert_pre_02b_fs (sb, bh)) {
sb->s_dev = 0;
unlock_super (sb);
brelse (bh);
printk ("EXT2-fs: conversion failed !!!\n");
return NULL;
}
printk ("EXT2-fs: conversion succeeded !!!\n");
fs_converted = 1;
}
#endif
if (sb->s_magic != EXT2_SUPER_MAGIC) {
sb->s_dev = 0;
unlock_super (sb);
brelse (bh);
if (!silent)
printk ("VFS: Can't find an ext2 filesystem on dev %d/%d.\n",
MAJOR(dev), MINOR(dev));
return NULL;
}
if (sb->s_blocksize != bh->b_size) {
sb->s_dev = 0;
unlock_super (sb);
brelse (bh);
if (!silent)
printk ("VFS: Unsupported blocksize on dev 0x%04x.\n",
dev);
return NULL;
}
if (sb->s_blocksize != sb->u.ext2_sb.s_frag_size) {
sb->s_dev = 0;
unlock_super (sb);
brelse (bh);
printk ("EXT2-fs: fragsize %lu != blocksize %lu (not supported yet)\n",
sb->u.ext2_sb.s_frag_size, sb->s_blocksize);
return NULL;
}
if (sb->u.ext2_sb.s_blocks_per_group > sb->s_blocksize * 8) {
sb->s_dev = 0;
unlock_super (sb);
brelse (bh);
printk ("EXT2-fs: #blocks per group too big: %lu\n",
sb->u.ext2_sb.s_blocks_per_group);
return NULL;
}
if (sb->u.ext2_sb.s_frags_per_group > sb->s_blocksize * 8) {
sb->s_dev = 0;
unlock_super (sb);
brelse (bh);
printk ("EXT2-fs: #fragments per group too big: %lu\n",
sb->u.ext2_sb.s_frags_per_group);
return NULL;
}
if (sb->u.ext2_sb.s_inodes_per_group > sb->s_blocksize * 8) {
sb->s_dev = 0;
unlock_super (sb);
brelse (bh);
printk ("EXT2-fs: #inodes per group too big: %lu\n",
sb->u.ext2_sb.s_inodes_per_group);
return NULL;
}
sb->u.ext2_sb.s_groups_count = (es->s_blocks_count -
es->s_first_data_block +
EXT2_BLOCKS_PER_GROUP(sb) - 1) /
EXT2_BLOCKS_PER_GROUP(sb);
db_count = (sb->u.ext2_sb.s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
EXT2_DESC_PER_BLOCK(sb);
sb->u.ext2_sb.s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL);
if (sb->u.ext2_sb.s_group_desc == NULL) {
sb->s_dev = 0;
unlock_super (sb);
brelse (bh);
printk ("EXT2-fs: not enough memory\n");
return NULL;
}
for (i = 0; i < db_count; i++) {
sb->u.ext2_sb.s_group_desc[i] = bread (dev, logic_sb_block + i + 1,
sb->s_blocksize);
if (!sb->u.ext2_sb.s_group_desc[i]) {
sb->s_dev = 0;
unlock_super (sb);
for (j = 0; j < i; j++)
brelse (sb->u.ext2_sb.s_group_desc[j]);
kfree_s (sb->u.ext2_sb.s_group_desc,
db_count * sizeof (struct buffer_head *));
brelse (bh);
printk ("EXT2-fs: unable to read group descriptors\n");
return NULL;
}
}
if (!ext2_check_descriptors (sb)) {
sb->s_dev = 0;
unlock_super (sb);
for (j = 0; j < db_count; j++)
brelse (sb->u.ext2_sb.s_group_desc[j]);
kfree_s (sb->u.ext2_sb.s_group_desc,
db_count * sizeof (struct buffer_head *));
brelse (bh);
printk ("EXT2-fs: group descriptors corrupted !\n");
return NULL;
}
for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) {
sb->u.ext2_sb.s_inode_bitmap_number[i] = 0;
sb->u.ext2_sb.s_inode_bitmap[i] = NULL;
sb->u.ext2_sb.s_block_bitmap_number[i] = 0;
sb->u.ext2_sb.s_block_bitmap[i] = NULL;
}
sb->u.ext2_sb.s_loaded_inode_bitmaps = 0;
sb->u.ext2_sb.s_loaded_block_bitmaps = 0;
sb->u.ext2_sb.s_db_per_group = db_count;
unlock_super (sb);
/*
* set up enough so that it can read an inode
*/
sb->s_dev = dev;
sb->s_op = &ext2_sops;
if (!(sb->s_mounted = iget (sb, EXT2_ROOT_INO))) {
sb->s_dev = 0;
for (i = 0; i < db_count; i++)
if (sb->u.ext2_sb.s_group_desc[i])
brelse (sb->u.ext2_sb.s_group_desc[i]);
kfree_s (sb->u.ext2_sb.s_group_desc,
db_count * sizeof (struct buffer_head *));
brelse (bh);
printk ("EXT2-fs: get root inode failed\n");
return NULL;
}
#ifdef EXT2FS_PRE_02B_COMPAT
if (fs_converted) {
for (i = 0; i < db_count; i++)
mark_buffer_dirty(sb->u.ext2_sb.s_group_desc[i], 1);
sb->s_dirt = 1;
}
#endif
ext2_setup_super (sb, es);
return sb;
}
static void ext2_commit_super (struct super_block * sb,
struct ext2_super_block * es)
{
es->s_wtime = CURRENT_TIME;
mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
sb->s_dirt = 0;
}
/*
* In the second extended file system, it is not necessary to
* write the super block since we use a mapping of the
* disk super block in a buffer.
*
* However, this function is still used to set the fs valid
* flags to 0. We need to set this flag to 0 since the fs
* may have been checked while mounted and e2fsck may have
* set s_state to EXT2_VALID_FS after some corrections.
*/
void ext2_write_super (struct super_block * sb)
{
struct ext2_super_block * es;
if (!(sb->s_flags & MS_RDONLY)) {
es = sb->u.ext2_sb.s_es;
ext2_debug ("setting valid to 0\n");
if (es->s_state & EXT2_VALID_FS) {
es->s_state &= ~EXT2_VALID_FS;
es->s_mtime = CURRENT_TIME;
}
ext2_commit_super (sb, es);
}
sb->s_dirt = 0;
}
int ext2_remount (struct super_block * sb, int * flags, char * data)
{
struct ext2_super_block * es;
unsigned short resuid = sb->u.ext2_sb.s_resuid;
unsigned short resgid = sb->u.ext2_sb.s_resgid;
unsigned long new_mount_opt;
unsigned long tmp;
/*
* Allow the "check" option to be passed as a remount option.
*/
set_opt (sb->u.ext2_sb.s_mount_opt, CHECK_NORMAL);
if (!parse_options (data, &tmp, &resuid, &resgid,
&new_mount_opt))
return -EINVAL;
sb->u.ext2_sb.s_mount_opt = new_mount_opt;
sb->u.ext2_sb.s_resuid = resuid;
sb->u.ext2_sb.s_resgid = resgid;
es = sb->u.ext2_sb.s_es;
if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
return 0;
if (*flags & MS_RDONLY) {
if (es->s_state & EXT2_VALID_FS ||
!(sb->u.ext2_sb.s_mount_state & EXT2_VALID_FS))
return 0;
/*
* OK, we are remounting a valid rw partition rdonly, so set
* the rdonly flag and then mark the partition as valid again.
*/
es->s_state = sb->u.ext2_sb.s_mount_state;
es->s_mtime = CURRENT_TIME;
mark_buffer_dirty(sb->u.ext2_sb.s_sbh, 1);
sb->s_dirt = 1;
ext2_commit_super (sb, es);
}
else {
/*
* Mounting a RDONLY partition read-write, so reread and
* store the current valid flag. (It may have been changed
* by e2fsck since we originally mounted the partition.)
*/
sb->u.ext2_sb.s_mount_state = es->s_state;
sb->s_flags &= ~MS_RDONLY;
ext2_setup_super (sb, es);
}
return 0;
}
void ext2_statfs (struct super_block * sb, struct statfs * buf)
{
long tmp;
unsigned long overhead;
unsigned long overhead_per_group;
if (test_opt (sb, MINIX_DF))
overhead = 0;
else {
/*
* Compute the overhead (FS structures)
*/
overhead_per_group = 1 /* super block */ +
sb->u.ext2_sb.s_db_per_group /* descriptors */ +
1 /* block bitmap */ +
1 /* inode bitmap */ +
sb->u.ext2_sb.s_itb_per_group /* inode table */;
overhead = sb->u.ext2_sb.s_es->s_first_data_block +
sb->u.ext2_sb.s_groups_count * overhead_per_group;
}
put_fs_long (EXT2_SUPER_MAGIC, &buf->f_type);
put_fs_long (sb->s_blocksize, &buf->f_bsize);
put_fs_long (sb->u.ext2_sb.s_es->s_blocks_count - overhead,
&buf->f_blocks);
tmp = ext2_count_free_blocks (sb);
put_fs_long (tmp, &buf->f_bfree);
if (tmp >= sb->u.ext2_sb.s_es->s_r_blocks_count)
put_fs_long (tmp - sb->u.ext2_sb.s_es->s_r_blocks_count,
&buf->f_bavail);
else
put_fs_long (0, &buf->f_bavail);
put_fs_long (sb->u.ext2_sb.s_es->s_inodes_count, &buf->f_files);
put_fs_long (ext2_count_free_inodes (sb), &buf->f_ffree);
put_fs_long (EXT2_NAME_LEN, &buf->f_namelen);
/* Don't know what value to put in buf->f_fsid */
}