forked from Minki/linux
d7dab39b6e
This is based on commit d1f5273e9a
ext4: return 32/64-bit dir name hash according to usage type
by Fan Yong <yong.fan@whamcloud.com>
Traditionally ext2/3/4 has returned a 32-bit hash value from llseek()
to appease NFSv2, which can only handle a 32-bit cookie for seekdir()
and telldir(). However, this causes problems if there are 32-bit hash
collisions, since the NFSv2 server can get stuck resending the same
entries from the directory repeatedly.
Allow ext3 to return a full 64-bit hash (both major and minor) for
telldir to decrease the chance of hash collisions.
This patch does implement a new ext3_dir_llseek op, because with 64-bit
hashes, nfs will attempt to seek to a hash "offset" which is much
larger than ext3's s_maxbytes. So for dx dirs, we call
generic_file_llseek_size() with the appropriate max hash value as the
maximum seekable size. Otherwise we just pass through to
generic_file_llseek().
Patch-updated-by: Bernd Schubert <bernd.schubert@itwm.fraunhofer.de>
Patch-updated-by: Eric Sandeen <sandeen@redhat.com>
(blame us if something is not correct)
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Jan Kara <jack@suse.cz>
1327 lines
44 KiB
C
1327 lines
44 KiB
C
/*
|
|
* Written by Stephen C. Tweedie <sct@redhat.com>, 1999
|
|
*
|
|
* Copyright 1998--1999 Red Hat corp --- All Rights Reserved
|
|
*
|
|
* This file is part of the Linux kernel and is made available under
|
|
* the terms of the GNU General Public License, version 2, or at your
|
|
* option, any later version, incorporated herein by reference.
|
|
*
|
|
* 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/include/linux/minix_fs.h
|
|
*
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
|
*/
|
|
|
|
#include <linux/fs.h>
|
|
#include <linux/jbd.h>
|
|
#include <linux/magic.h>
|
|
#include <linux/bug.h>
|
|
#include <linux/blockgroup_lock.h>
|
|
|
|
/*
|
|
* The second extended filesystem constants/structures
|
|
*/
|
|
|
|
/*
|
|
* Define EXT3FS_DEBUG to produce debug messages
|
|
*/
|
|
#undef EXT3FS_DEBUG
|
|
|
|
/*
|
|
* Define EXT3_RESERVATION to reserve data blocks for expanding files
|
|
*/
|
|
#define EXT3_DEFAULT_RESERVE_BLOCKS 8
|
|
/*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
|
|
#define EXT3_MAX_RESERVE_BLOCKS 1027
|
|
#define EXT3_RESERVE_WINDOW_NOT_ALLOCATED 0
|
|
|
|
/*
|
|
* Debug code
|
|
*/
|
|
#ifdef EXT3FS_DEBUG
|
|
#define ext3_debug(f, a...) \
|
|
do { \
|
|
printk (KERN_DEBUG "EXT3-fs DEBUG (%s, %d): %s:", \
|
|
__FILE__, __LINE__, __func__); \
|
|
printk (KERN_DEBUG f, ## a); \
|
|
} while (0)
|
|
#else
|
|
#define ext3_debug(f, a...) do {} while (0)
|
|
#endif
|
|
|
|
/*
|
|
* Special inodes numbers
|
|
*/
|
|
#define EXT3_BAD_INO 1 /* Bad blocks inode */
|
|
#define EXT3_ROOT_INO 2 /* Root inode */
|
|
#define EXT3_BOOT_LOADER_INO 5 /* Boot loader inode */
|
|
#define EXT3_UNDEL_DIR_INO 6 /* Undelete directory inode */
|
|
#define EXT3_RESIZE_INO 7 /* Reserved group descriptors inode */
|
|
#define EXT3_JOURNAL_INO 8 /* Journal inode */
|
|
|
|
/* First non-reserved inode for old ext3 filesystems */
|
|
#define EXT3_GOOD_OLD_FIRST_INO 11
|
|
|
|
/*
|
|
* Maximal count of links to a file
|
|
*/
|
|
#define EXT3_LINK_MAX 32000
|
|
|
|
/*
|
|
* Macro-instructions used to manage several block sizes
|
|
*/
|
|
#define EXT3_MIN_BLOCK_SIZE 1024
|
|
#define EXT3_MAX_BLOCK_SIZE 65536
|
|
#define EXT3_MIN_BLOCK_LOG_SIZE 10
|
|
#define EXT3_BLOCK_SIZE(s) ((s)->s_blocksize)
|
|
#define EXT3_ADDR_PER_BLOCK(s) (EXT3_BLOCK_SIZE(s) / sizeof (__u32))
|
|
#define EXT3_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
|
|
#define EXT3_ADDR_PER_BLOCK_BITS(s) (EXT3_SB(s)->s_addr_per_block_bits)
|
|
#define EXT3_INODE_SIZE(s) (EXT3_SB(s)->s_inode_size)
|
|
#define EXT3_FIRST_INO(s) (EXT3_SB(s)->s_first_ino)
|
|
|
|
/*
|
|
* Macro-instructions used to manage fragments
|
|
*/
|
|
#define EXT3_MIN_FRAG_SIZE 1024
|
|
#define EXT3_MAX_FRAG_SIZE 4096
|
|
#define EXT3_MIN_FRAG_LOG_SIZE 10
|
|
#define EXT3_FRAG_SIZE(s) (EXT3_SB(s)->s_frag_size)
|
|
#define EXT3_FRAGS_PER_BLOCK(s) (EXT3_SB(s)->s_frags_per_block)
|
|
|
|
/*
|
|
* Structure of a blocks group descriptor
|
|
*/
|
|
struct ext3_group_desc
|
|
{
|
|
__le32 bg_block_bitmap; /* Blocks bitmap block */
|
|
__le32 bg_inode_bitmap; /* Inodes bitmap block */
|
|
__le32 bg_inode_table; /* Inodes table block */
|
|
__le16 bg_free_blocks_count; /* Free blocks count */
|
|
__le16 bg_free_inodes_count; /* Free inodes count */
|
|
__le16 bg_used_dirs_count; /* Directories count */
|
|
__u16 bg_pad;
|
|
__le32 bg_reserved[3];
|
|
};
|
|
|
|
/*
|
|
* Macro-instructions used to manage group descriptors
|
|
*/
|
|
#define EXT3_BLOCKS_PER_GROUP(s) (EXT3_SB(s)->s_blocks_per_group)
|
|
#define EXT3_DESC_PER_BLOCK(s) (EXT3_SB(s)->s_desc_per_block)
|
|
#define EXT3_INODES_PER_GROUP(s) (EXT3_SB(s)->s_inodes_per_group)
|
|
#define EXT3_DESC_PER_BLOCK_BITS(s) (EXT3_SB(s)->s_desc_per_block_bits)
|
|
|
|
/*
|
|
* Constants relative to the data blocks
|
|
*/
|
|
#define EXT3_NDIR_BLOCKS 12
|
|
#define EXT3_IND_BLOCK EXT3_NDIR_BLOCKS
|
|
#define EXT3_DIND_BLOCK (EXT3_IND_BLOCK + 1)
|
|
#define EXT3_TIND_BLOCK (EXT3_DIND_BLOCK + 1)
|
|
#define EXT3_N_BLOCKS (EXT3_TIND_BLOCK + 1)
|
|
|
|
/*
|
|
* Inode flags
|
|
*/
|
|
#define EXT3_SECRM_FL 0x00000001 /* Secure deletion */
|
|
#define EXT3_UNRM_FL 0x00000002 /* Undelete */
|
|
#define EXT3_COMPR_FL 0x00000004 /* Compress file */
|
|
#define EXT3_SYNC_FL 0x00000008 /* Synchronous updates */
|
|
#define EXT3_IMMUTABLE_FL 0x00000010 /* Immutable file */
|
|
#define EXT3_APPEND_FL 0x00000020 /* writes to file may only append */
|
|
#define EXT3_NODUMP_FL 0x00000040 /* do not dump file */
|
|
#define EXT3_NOATIME_FL 0x00000080 /* do not update atime */
|
|
/* Reserved for compression usage... */
|
|
#define EXT3_DIRTY_FL 0x00000100
|
|
#define EXT3_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
|
|
#define EXT3_NOCOMPR_FL 0x00000400 /* Don't compress */
|
|
#define EXT3_ECOMPR_FL 0x00000800 /* Compression error */
|
|
/* End compression flags --- maybe not all used */
|
|
#define EXT3_INDEX_FL 0x00001000 /* hash-indexed directory */
|
|
#define EXT3_IMAGIC_FL 0x00002000 /* AFS directory */
|
|
#define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
|
|
#define EXT3_NOTAIL_FL 0x00008000 /* file tail should not be merged */
|
|
#define EXT3_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
|
|
#define EXT3_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
|
|
#define EXT3_RESERVED_FL 0x80000000 /* reserved for ext3 lib */
|
|
|
|
#define EXT3_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
|
|
#define EXT3_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
|
|
|
|
/* Flags that should be inherited by new inodes from their parent. */
|
|
#define EXT3_FL_INHERITED (EXT3_SECRM_FL | EXT3_UNRM_FL | EXT3_COMPR_FL |\
|
|
EXT3_SYNC_FL | EXT3_NODUMP_FL |\
|
|
EXT3_NOATIME_FL | EXT3_COMPRBLK_FL |\
|
|
EXT3_NOCOMPR_FL | EXT3_JOURNAL_DATA_FL |\
|
|
EXT3_NOTAIL_FL | EXT3_DIRSYNC_FL)
|
|
|
|
/* Flags that are appropriate for regular files (all but dir-specific ones). */
|
|
#define EXT3_REG_FLMASK (~(EXT3_DIRSYNC_FL | EXT3_TOPDIR_FL))
|
|
|
|
/* Flags that are appropriate for non-directories/regular files. */
|
|
#define EXT3_OTHER_FLMASK (EXT3_NODUMP_FL | EXT3_NOATIME_FL)
|
|
|
|
/* Mask out flags that are inappropriate for the given type of inode. */
|
|
static inline __u32 ext3_mask_flags(umode_t mode, __u32 flags)
|
|
{
|
|
if (S_ISDIR(mode))
|
|
return flags;
|
|
else if (S_ISREG(mode))
|
|
return flags & EXT3_REG_FLMASK;
|
|
else
|
|
return flags & EXT3_OTHER_FLMASK;
|
|
}
|
|
|
|
/* Used to pass group descriptor data when online resize is done */
|
|
struct ext3_new_group_input {
|
|
__u32 group; /* Group number for this data */
|
|
__u32 block_bitmap; /* Absolute block number of block bitmap */
|
|
__u32 inode_bitmap; /* Absolute block number of inode bitmap */
|
|
__u32 inode_table; /* Absolute block number of inode table start */
|
|
__u32 blocks_count; /* Total number of blocks in this group */
|
|
__u16 reserved_blocks; /* Number of reserved blocks in this group */
|
|
__u16 unused;
|
|
};
|
|
|
|
/* The struct ext3_new_group_input in kernel space, with free_blocks_count */
|
|
struct ext3_new_group_data {
|
|
__u32 group;
|
|
__u32 block_bitmap;
|
|
__u32 inode_bitmap;
|
|
__u32 inode_table;
|
|
__u32 blocks_count;
|
|
__u16 reserved_blocks;
|
|
__u16 unused;
|
|
__u32 free_blocks_count;
|
|
};
|
|
|
|
|
|
/*
|
|
* ioctl commands
|
|
*/
|
|
#define EXT3_IOC_GETFLAGS FS_IOC_GETFLAGS
|
|
#define EXT3_IOC_SETFLAGS FS_IOC_SETFLAGS
|
|
#define EXT3_IOC_GETVERSION _IOR('f', 3, long)
|
|
#define EXT3_IOC_SETVERSION _IOW('f', 4, long)
|
|
#define EXT3_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
|
|
#define EXT3_IOC_GROUP_ADD _IOW('f', 8,struct ext3_new_group_input)
|
|
#define EXT3_IOC_GETVERSION_OLD FS_IOC_GETVERSION
|
|
#define EXT3_IOC_SETVERSION_OLD FS_IOC_SETVERSION
|
|
#ifdef CONFIG_JBD_DEBUG
|
|
#define EXT3_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
|
|
#endif
|
|
#define EXT3_IOC_GETRSVSZ _IOR('f', 5, long)
|
|
#define EXT3_IOC_SETRSVSZ _IOW('f', 6, long)
|
|
|
|
/*
|
|
* ioctl commands in 32 bit emulation
|
|
*/
|
|
#define EXT3_IOC32_GETFLAGS FS_IOC32_GETFLAGS
|
|
#define EXT3_IOC32_SETFLAGS FS_IOC32_SETFLAGS
|
|
#define EXT3_IOC32_GETVERSION _IOR('f', 3, int)
|
|
#define EXT3_IOC32_SETVERSION _IOW('f', 4, int)
|
|
#define EXT3_IOC32_GETRSVSZ _IOR('f', 5, int)
|
|
#define EXT3_IOC32_SETRSVSZ _IOW('f', 6, int)
|
|
#define EXT3_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
|
|
#ifdef CONFIG_JBD_DEBUG
|
|
#define EXT3_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
|
|
#endif
|
|
#define EXT3_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
|
|
#define EXT3_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
|
|
|
|
|
|
/*
|
|
* Mount options
|
|
*/
|
|
struct ext3_mount_options {
|
|
unsigned long s_mount_opt;
|
|
uid_t s_resuid;
|
|
gid_t s_resgid;
|
|
unsigned long s_commit_interval;
|
|
#ifdef CONFIG_QUOTA
|
|
int s_jquota_fmt;
|
|
char *s_qf_names[MAXQUOTAS];
|
|
#endif
|
|
};
|
|
|
|
/*
|
|
* Structure of an inode on the disk
|
|
*/
|
|
struct ext3_inode {
|
|
__le16 i_mode; /* File mode */
|
|
__le16 i_uid; /* Low 16 bits of Owner Uid */
|
|
__le32 i_size; /* Size in bytes */
|
|
__le32 i_atime; /* Access time */
|
|
__le32 i_ctime; /* Creation time */
|
|
__le32 i_mtime; /* Modification time */
|
|
__le32 i_dtime; /* Deletion Time */
|
|
__le16 i_gid; /* Low 16 bits of Group Id */
|
|
__le16 i_links_count; /* Links count */
|
|
__le32 i_blocks; /* Blocks count */
|
|
__le32 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 */
|
|
__le32 i_block[EXT3_N_BLOCKS];/* Pointers to blocks */
|
|
__le32 i_generation; /* File version (for NFS) */
|
|
__le32 i_file_acl; /* File ACL */
|
|
__le32 i_dir_acl; /* Directory ACL */
|
|
__le32 i_faddr; /* Fragment address */
|
|
union {
|
|
struct {
|
|
__u8 l_i_frag; /* Fragment number */
|
|
__u8 l_i_fsize; /* Fragment size */
|
|
__u16 i_pad1;
|
|
__le16 l_i_uid_high; /* these 2 fields */
|
|
__le16 l_i_gid_high; /* were reserved2[0] */
|
|
__u32 l_i_reserved2;
|
|
} 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 */
|
|
__le16 i_extra_isize;
|
|
__le16 i_pad1;
|
|
};
|
|
|
|
#define i_size_high i_dir_acl
|
|
|
|
#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_uid_low i_uid
|
|
#define i_gid_low i_gid
|
|
#define i_uid_high osd2.linux2.l_i_uid_high
|
|
#define i_gid_high osd2.linux2.l_i_gid_high
|
|
#define i_reserved2 osd2.linux2.l_i_reserved2
|
|
|
|
/*
|
|
* File system states
|
|
*/
|
|
#define EXT3_VALID_FS 0x0001 /* Unmounted cleanly */
|
|
#define EXT3_ERROR_FS 0x0002 /* Errors detected */
|
|
#define EXT3_ORPHAN_FS 0x0004 /* Orphans being recovered */
|
|
|
|
/*
|
|
* Misc. filesystem flags
|
|
*/
|
|
#define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
|
|
#define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
|
|
#define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
|
|
|
|
/*
|
|
* Mount flags
|
|
*/
|
|
#define EXT3_MOUNT_CHECK 0x00001 /* Do mount-time checks */
|
|
/* EXT3_MOUNT_OLDALLOC was there */
|
|
#define EXT3_MOUNT_GRPID 0x00004 /* Create files with directory's group */
|
|
#define EXT3_MOUNT_DEBUG 0x00008 /* Some debugging messages */
|
|
#define EXT3_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
|
|
#define EXT3_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
|
|
#define EXT3_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
|
|
#define EXT3_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
|
|
#define EXT3_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
|
|
#define EXT3_MOUNT_ABORT 0x00200 /* Fatal error detected */
|
|
#define EXT3_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
|
|
#define EXT3_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
|
|
#define EXT3_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
|
|
#define EXT3_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
|
|
#define EXT3_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
|
|
#define EXT3_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
|
|
#define EXT3_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
|
|
#define EXT3_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
|
|
#define EXT3_MOUNT_RESERVATION 0x10000 /* Preallocation */
|
|
#define EXT3_MOUNT_BARRIER 0x20000 /* Use block barriers */
|
|
#define EXT3_MOUNT_QUOTA 0x80000 /* Some quota option set */
|
|
#define EXT3_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
|
|
#define EXT3_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
|
|
#define EXT3_MOUNT_DATA_ERR_ABORT 0x400000 /* Abort on file data write
|
|
* error in ordered mode */
|
|
|
|
/* Compatibility, for having both ext2_fs.h and ext3_fs.h included at once */
|
|
#ifndef _LINUX_EXT2_FS_H
|
|
#define clear_opt(o, opt) o &= ~EXT3_MOUNT_##opt
|
|
#define set_opt(o, opt) o |= EXT3_MOUNT_##opt
|
|
#define test_opt(sb, opt) (EXT3_SB(sb)->s_mount_opt & \
|
|
EXT3_MOUNT_##opt)
|
|
#else
|
|
#define EXT2_MOUNT_NOLOAD EXT3_MOUNT_NOLOAD
|
|
#define EXT2_MOUNT_ABORT EXT3_MOUNT_ABORT
|
|
#define EXT2_MOUNT_DATA_FLAGS EXT3_MOUNT_DATA_FLAGS
|
|
#endif
|
|
|
|
#define ext3_set_bit __set_bit_le
|
|
#define ext3_set_bit_atomic ext2_set_bit_atomic
|
|
#define ext3_clear_bit __clear_bit_le
|
|
#define ext3_clear_bit_atomic ext2_clear_bit_atomic
|
|
#define ext3_test_bit test_bit_le
|
|
#define ext3_find_next_zero_bit find_next_zero_bit_le
|
|
|
|
/*
|
|
* Maximal mount counts between two filesystem checks
|
|
*/
|
|
#define EXT3_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
|
|
#define EXT3_DFL_CHECKINTERVAL 0 /* Don't use interval check */
|
|
|
|
/*
|
|
* Behaviour when detecting errors
|
|
*/
|
|
#define EXT3_ERRORS_CONTINUE 1 /* Continue execution */
|
|
#define EXT3_ERRORS_RO 2 /* Remount fs read-only */
|
|
#define EXT3_ERRORS_PANIC 3 /* Panic */
|
|
#define EXT3_ERRORS_DEFAULT EXT3_ERRORS_CONTINUE
|
|
|
|
/*
|
|
* Structure of the super block
|
|
*/
|
|
struct ext3_super_block {
|
|
/*00*/ __le32 s_inodes_count; /* Inodes count */
|
|
__le32 s_blocks_count; /* Blocks count */
|
|
__le32 s_r_blocks_count; /* Reserved blocks count */
|
|
__le32 s_free_blocks_count; /* Free blocks count */
|
|
/*10*/ __le32 s_free_inodes_count; /* Free inodes count */
|
|
__le32 s_first_data_block; /* First Data Block */
|
|
__le32 s_log_block_size; /* Block size */
|
|
__le32 s_log_frag_size; /* Fragment size */
|
|
/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
|
|
__le32 s_frags_per_group; /* # Fragments per group */
|
|
__le32 s_inodes_per_group; /* # Inodes per group */
|
|
__le32 s_mtime; /* Mount time */
|
|
/*30*/ __le32 s_wtime; /* Write time */
|
|
__le16 s_mnt_count; /* Mount count */
|
|
__le16 s_max_mnt_count; /* Maximal mount count */
|
|
__le16 s_magic; /* Magic signature */
|
|
__le16 s_state; /* File system state */
|
|
__le16 s_errors; /* Behaviour when detecting errors */
|
|
__le16 s_minor_rev_level; /* minor revision level */
|
|
/*40*/ __le32 s_lastcheck; /* time of last check */
|
|
__le32 s_checkinterval; /* max. time between checks */
|
|
__le32 s_creator_os; /* OS */
|
|
__le32 s_rev_level; /* Revision level */
|
|
/*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
|
|
__le16 s_def_resgid; /* Default gid for reserved blocks */
|
|
/*
|
|
* These fields are for EXT3_DYNAMIC_REV superblocks only.
|
|
*
|
|
* Note: the difference between the compatible feature set and
|
|
* the incompatible feature set is that if there is a bit set
|
|
* in the incompatible feature set that the kernel doesn't
|
|
* know about, it should refuse to mount the filesystem.
|
|
*
|
|
* e2fsck's requirements are more strict; if it doesn't know
|
|
* about a feature in either the compatible or incompatible
|
|
* feature set, it must abort and not try to meddle with
|
|
* things it doesn't understand...
|
|
*/
|
|
__le32 s_first_ino; /* First non-reserved inode */
|
|
__le16 s_inode_size; /* size of inode structure */
|
|
__le16 s_block_group_nr; /* block group # of this superblock */
|
|
__le32 s_feature_compat; /* compatible feature set */
|
|
/*60*/ __le32 s_feature_incompat; /* incompatible feature set */
|
|
__le32 s_feature_ro_compat; /* readonly-compatible feature set */
|
|
/*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
|
|
/*78*/ char s_volume_name[16]; /* volume name */
|
|
/*88*/ char s_last_mounted[64]; /* directory where last mounted */
|
|
/*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
|
|
/*
|
|
* Performance hints. Directory preallocation should only
|
|
* happen if the EXT3_FEATURE_COMPAT_DIR_PREALLOC flag is on.
|
|
*/
|
|
__u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
|
|
__u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
|
|
__le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
|
|
/*
|
|
* Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
|
|
*/
|
|
/*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
|
|
/*E0*/ __le32 s_journal_inum; /* inode number of journal file */
|
|
__le32 s_journal_dev; /* device number of journal file */
|
|
__le32 s_last_orphan; /* start of list of inodes to delete */
|
|
__le32 s_hash_seed[4]; /* HTREE hash seed */
|
|
__u8 s_def_hash_version; /* Default hash version to use */
|
|
__u8 s_reserved_char_pad;
|
|
__u16 s_reserved_word_pad;
|
|
__le32 s_default_mount_opts;
|
|
__le32 s_first_meta_bg; /* First metablock block group */
|
|
__le32 s_mkfs_time; /* When the filesystem was created */
|
|
__le32 s_jnl_blocks[17]; /* Backup of the journal inode */
|
|
/* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
|
|
/*150*/ __le32 s_blocks_count_hi; /* Blocks count */
|
|
__le32 s_r_blocks_count_hi; /* Reserved blocks count */
|
|
__le32 s_free_blocks_count_hi; /* Free blocks count */
|
|
__le16 s_min_extra_isize; /* All inodes have at least # bytes */
|
|
__le16 s_want_extra_isize; /* New inodes should reserve # bytes */
|
|
__le32 s_flags; /* Miscellaneous flags */
|
|
__le16 s_raid_stride; /* RAID stride */
|
|
__le16 s_mmp_interval; /* # seconds to wait in MMP checking */
|
|
__le64 s_mmp_block; /* Block for multi-mount protection */
|
|
__le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
|
|
__u8 s_log_groups_per_flex; /* FLEX_BG group size */
|
|
__u8 s_reserved_char_pad2;
|
|
__le16 s_reserved_pad;
|
|
__u32 s_reserved[162]; /* Padding to the end of the block */
|
|
};
|
|
|
|
/* data type for block offset of block group */
|
|
typedef int ext3_grpblk_t;
|
|
|
|
/* data type for filesystem-wide blocks number */
|
|
typedef unsigned long ext3_fsblk_t;
|
|
|
|
#define E3FSBLK "%lu"
|
|
|
|
struct ext3_reserve_window {
|
|
ext3_fsblk_t _rsv_start; /* First byte reserved */
|
|
ext3_fsblk_t _rsv_end; /* Last byte reserved or 0 */
|
|
};
|
|
|
|
struct ext3_reserve_window_node {
|
|
struct rb_node rsv_node;
|
|
__u32 rsv_goal_size;
|
|
__u32 rsv_alloc_hit;
|
|
struct ext3_reserve_window rsv_window;
|
|
};
|
|
|
|
struct ext3_block_alloc_info {
|
|
/* information about reservation window */
|
|
struct ext3_reserve_window_node rsv_window_node;
|
|
/*
|
|
* was i_next_alloc_block in ext3_inode_info
|
|
* is the logical (file-relative) number of the
|
|
* most-recently-allocated block in this file.
|
|
* We use this for detecting linearly ascending allocation requests.
|
|
*/
|
|
__u32 last_alloc_logical_block;
|
|
/*
|
|
* Was i_next_alloc_goal in ext3_inode_info
|
|
* is the *physical* companion to i_next_alloc_block.
|
|
* it the physical block number of the block which was most-recentl
|
|
* allocated to this file. This give us the goal (target) for the next
|
|
* allocation when we detect linearly ascending requests.
|
|
*/
|
|
ext3_fsblk_t last_alloc_physical_block;
|
|
};
|
|
|
|
#define rsv_start rsv_window._rsv_start
|
|
#define rsv_end rsv_window._rsv_end
|
|
|
|
/*
|
|
* third extended file system inode data in memory
|
|
*/
|
|
struct ext3_inode_info {
|
|
__le32 i_data[15]; /* unconverted */
|
|
__u32 i_flags;
|
|
#ifdef EXT3_FRAGMENTS
|
|
__u32 i_faddr;
|
|
__u8 i_frag_no;
|
|
__u8 i_frag_size;
|
|
#endif
|
|
ext3_fsblk_t i_file_acl;
|
|
__u32 i_dir_acl;
|
|
__u32 i_dtime;
|
|
|
|
/*
|
|
* i_block_group is the number of the block group which contains
|
|
* this file's inode. Constant across the lifetime of the inode,
|
|
* it is ued for making block allocation decisions - we try to
|
|
* place a file's data blocks near its inode block, and new inodes
|
|
* near to their parent directory's inode.
|
|
*/
|
|
__u32 i_block_group;
|
|
unsigned long i_state_flags; /* Dynamic state flags for ext3 */
|
|
|
|
/* block reservation info */
|
|
struct ext3_block_alloc_info *i_block_alloc_info;
|
|
|
|
__u32 i_dir_start_lookup;
|
|
#ifdef CONFIG_EXT3_FS_XATTR
|
|
/*
|
|
* Extended attributes can be read independently of the main file
|
|
* data. Taking i_mutex even when reading would cause contention
|
|
* between readers of EAs and writers of regular file data, so
|
|
* instead we synchronize on xattr_sem when reading or changing
|
|
* EAs.
|
|
*/
|
|
struct rw_semaphore xattr_sem;
|
|
#endif
|
|
|
|
struct list_head i_orphan; /* unlinked but open inodes */
|
|
|
|
/*
|
|
* i_disksize keeps track of what the inode size is ON DISK, not
|
|
* in memory. During truncate, i_size is set to the new size by
|
|
* the VFS prior to calling ext3_truncate(), but the filesystem won't
|
|
* set i_disksize to 0 until the truncate is actually under way.
|
|
*
|
|
* The intent is that i_disksize always represents the blocks which
|
|
* are used by this file. This allows recovery to restart truncate
|
|
* on orphans if we crash during truncate. We actually write i_disksize
|
|
* into the on-disk inode when writing inodes out, instead of i_size.
|
|
*
|
|
* The only time when i_disksize and i_size may be different is when
|
|
* a truncate is in progress. The only things which change i_disksize
|
|
* are ext3_get_block (growth) and ext3_truncate (shrinkth).
|
|
*/
|
|
loff_t i_disksize;
|
|
|
|
/* on-disk additional length */
|
|
__u16 i_extra_isize;
|
|
|
|
/*
|
|
* truncate_mutex is for serialising ext3_truncate() against
|
|
* ext3_getblock(). In the 2.4 ext2 design, great chunks of inode's
|
|
* data tree are chopped off during truncate. We can't do that in
|
|
* ext3 because whenever we perform intermediate commits during
|
|
* truncate, the inode and all the metadata blocks *must* be in a
|
|
* consistent state which allows truncation of the orphans to restart
|
|
* during recovery. Hence we must fix the get_block-vs-truncate race
|
|
* by other means, so we have truncate_mutex.
|
|
*/
|
|
struct mutex truncate_mutex;
|
|
|
|
/*
|
|
* Transactions that contain inode's metadata needed to complete
|
|
* fsync and fdatasync, respectively.
|
|
*/
|
|
atomic_t i_sync_tid;
|
|
atomic_t i_datasync_tid;
|
|
|
|
struct inode vfs_inode;
|
|
};
|
|
|
|
/*
|
|
* third extended-fs super-block data in memory
|
|
*/
|
|
struct ext3_sb_info {
|
|
unsigned long s_frag_size; /* Size of a fragment in bytes */
|
|
unsigned long s_frags_per_block;/* Number of fragments per block */
|
|
unsigned long s_inodes_per_block;/* Number of inodes per block */
|
|
unsigned long s_frags_per_group;/* Number of fragments in a group */
|
|
unsigned long s_blocks_per_group;/* Number of blocks in a group */
|
|
unsigned long s_inodes_per_group;/* Number of inodes in a group */
|
|
unsigned long s_itb_per_group; /* Number of inode table blocks per group */
|
|
unsigned long s_gdb_count; /* Number of group descriptor blocks */
|
|
unsigned long s_desc_per_block; /* Number of group descriptors per block */
|
|
unsigned long s_groups_count; /* Number of groups in the fs */
|
|
unsigned long s_overhead_last; /* Last calculated overhead */
|
|
unsigned long s_blocks_last; /* Last seen block count */
|
|
struct buffer_head * s_sbh; /* Buffer containing the super block */
|
|
struct ext3_super_block * s_es; /* Pointer to the super block in the buffer */
|
|
struct buffer_head ** s_group_desc;
|
|
unsigned long s_mount_opt;
|
|
ext3_fsblk_t s_sb_block;
|
|
uid_t s_resuid;
|
|
gid_t s_resgid;
|
|
unsigned short s_mount_state;
|
|
unsigned short s_pad;
|
|
int s_addr_per_block_bits;
|
|
int s_desc_per_block_bits;
|
|
int s_inode_size;
|
|
int s_first_ino;
|
|
spinlock_t s_next_gen_lock;
|
|
u32 s_next_generation;
|
|
u32 s_hash_seed[4];
|
|
int s_def_hash_version;
|
|
int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
|
|
struct percpu_counter s_freeblocks_counter;
|
|
struct percpu_counter s_freeinodes_counter;
|
|
struct percpu_counter s_dirs_counter;
|
|
struct blockgroup_lock *s_blockgroup_lock;
|
|
|
|
/* root of the per fs reservation window tree */
|
|
spinlock_t s_rsv_window_lock;
|
|
struct rb_root s_rsv_window_root;
|
|
struct ext3_reserve_window_node s_rsv_window_head;
|
|
|
|
/* Journaling */
|
|
struct inode * s_journal_inode;
|
|
struct journal_s * s_journal;
|
|
struct list_head s_orphan;
|
|
struct mutex s_orphan_lock;
|
|
struct mutex s_resize_lock;
|
|
unsigned long s_commit_interval;
|
|
struct block_device *journal_bdev;
|
|
#ifdef CONFIG_QUOTA
|
|
char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
|
|
int s_jquota_fmt; /* Format of quota to use */
|
|
#endif
|
|
};
|
|
|
|
static inline spinlock_t *
|
|
sb_bgl_lock(struct ext3_sb_info *sbi, unsigned int block_group)
|
|
{
|
|
return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group);
|
|
}
|
|
|
|
static inline struct ext3_sb_info * EXT3_SB(struct super_block *sb)
|
|
{
|
|
return sb->s_fs_info;
|
|
}
|
|
static inline struct ext3_inode_info *EXT3_I(struct inode *inode)
|
|
{
|
|
return container_of(inode, struct ext3_inode_info, vfs_inode);
|
|
}
|
|
|
|
static inline int ext3_valid_inum(struct super_block *sb, unsigned long ino)
|
|
{
|
|
return ino == EXT3_ROOT_INO ||
|
|
ino == EXT3_JOURNAL_INO ||
|
|
ino == EXT3_RESIZE_INO ||
|
|
(ino >= EXT3_FIRST_INO(sb) &&
|
|
ino <= le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count));
|
|
}
|
|
|
|
/*
|
|
* Inode dynamic state flags
|
|
*/
|
|
enum {
|
|
EXT3_STATE_JDATA, /* journaled data exists */
|
|
EXT3_STATE_NEW, /* inode is newly created */
|
|
EXT3_STATE_XATTR, /* has in-inode xattrs */
|
|
EXT3_STATE_FLUSH_ON_CLOSE, /* flush dirty pages on close */
|
|
};
|
|
|
|
static inline int ext3_test_inode_state(struct inode *inode, int bit)
|
|
{
|
|
return test_bit(bit, &EXT3_I(inode)->i_state_flags);
|
|
}
|
|
|
|
static inline void ext3_set_inode_state(struct inode *inode, int bit)
|
|
{
|
|
set_bit(bit, &EXT3_I(inode)->i_state_flags);
|
|
}
|
|
|
|
static inline void ext3_clear_inode_state(struct inode *inode, int bit)
|
|
{
|
|
clear_bit(bit, &EXT3_I(inode)->i_state_flags);
|
|
}
|
|
|
|
#define NEXT_ORPHAN(inode) EXT3_I(inode)->i_dtime
|
|
|
|
/*
|
|
* Codes for operating systems
|
|
*/
|
|
#define EXT3_OS_LINUX 0
|
|
#define EXT3_OS_HURD 1
|
|
#define EXT3_OS_MASIX 2
|
|
#define EXT3_OS_FREEBSD 3
|
|
#define EXT3_OS_LITES 4
|
|
|
|
/*
|
|
* Revision levels
|
|
*/
|
|
#define EXT3_GOOD_OLD_REV 0 /* The good old (original) format */
|
|
#define EXT3_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
|
|
|
|
#define EXT3_CURRENT_REV EXT3_GOOD_OLD_REV
|
|
#define EXT3_MAX_SUPP_REV EXT3_DYNAMIC_REV
|
|
|
|
#define EXT3_GOOD_OLD_INODE_SIZE 128
|
|
|
|
/*
|
|
* Feature set definitions
|
|
*/
|
|
|
|
#define EXT3_HAS_COMPAT_FEATURE(sb,mask) \
|
|
( EXT3_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
|
|
#define EXT3_HAS_RO_COMPAT_FEATURE(sb,mask) \
|
|
( EXT3_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
|
|
#define EXT3_HAS_INCOMPAT_FEATURE(sb,mask) \
|
|
( EXT3_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
|
|
#define EXT3_SET_COMPAT_FEATURE(sb,mask) \
|
|
EXT3_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
|
|
#define EXT3_SET_RO_COMPAT_FEATURE(sb,mask) \
|
|
EXT3_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
|
|
#define EXT3_SET_INCOMPAT_FEATURE(sb,mask) \
|
|
EXT3_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
|
|
#define EXT3_CLEAR_COMPAT_FEATURE(sb,mask) \
|
|
EXT3_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
|
|
#define EXT3_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
|
|
EXT3_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
|
|
#define EXT3_CLEAR_INCOMPAT_FEATURE(sb,mask) \
|
|
EXT3_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
|
|
|
|
#define EXT3_FEATURE_COMPAT_DIR_PREALLOC 0x0001
|
|
#define EXT3_FEATURE_COMPAT_IMAGIC_INODES 0x0002
|
|
#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
|
|
#define EXT3_FEATURE_COMPAT_EXT_ATTR 0x0008
|
|
#define EXT3_FEATURE_COMPAT_RESIZE_INODE 0x0010
|
|
#define EXT3_FEATURE_COMPAT_DIR_INDEX 0x0020
|
|
|
|
#define EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
|
|
#define EXT3_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
|
|
#define EXT3_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
|
|
|
|
#define EXT3_FEATURE_INCOMPAT_COMPRESSION 0x0001
|
|
#define EXT3_FEATURE_INCOMPAT_FILETYPE 0x0002
|
|
#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
|
|
#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
|
|
#define EXT3_FEATURE_INCOMPAT_META_BG 0x0010
|
|
|
|
#define EXT3_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
|
|
#define EXT3_FEATURE_INCOMPAT_SUPP (EXT3_FEATURE_INCOMPAT_FILETYPE| \
|
|
EXT3_FEATURE_INCOMPAT_RECOVER| \
|
|
EXT3_FEATURE_INCOMPAT_META_BG)
|
|
#define EXT3_FEATURE_RO_COMPAT_SUPP (EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER| \
|
|
EXT3_FEATURE_RO_COMPAT_LARGE_FILE| \
|
|
EXT3_FEATURE_RO_COMPAT_BTREE_DIR)
|
|
|
|
/*
|
|
* Default values for user and/or group using reserved blocks
|
|
*/
|
|
#define EXT3_DEF_RESUID 0
|
|
#define EXT3_DEF_RESGID 0
|
|
|
|
/*
|
|
* Default mount options
|
|
*/
|
|
#define EXT3_DEFM_DEBUG 0x0001
|
|
#define EXT3_DEFM_BSDGROUPS 0x0002
|
|
#define EXT3_DEFM_XATTR_USER 0x0004
|
|
#define EXT3_DEFM_ACL 0x0008
|
|
#define EXT3_DEFM_UID16 0x0010
|
|
#define EXT3_DEFM_JMODE 0x0060
|
|
#define EXT3_DEFM_JMODE_DATA 0x0020
|
|
#define EXT3_DEFM_JMODE_ORDERED 0x0040
|
|
#define EXT3_DEFM_JMODE_WBACK 0x0060
|
|
|
|
/*
|
|
* Structure of a directory entry
|
|
*/
|
|
#define EXT3_NAME_LEN 255
|
|
|
|
struct ext3_dir_entry {
|
|
__le32 inode; /* Inode number */
|
|
__le16 rec_len; /* Directory entry length */
|
|
__le16 name_len; /* Name length */
|
|
char name[EXT3_NAME_LEN]; /* File name */
|
|
};
|
|
|
|
/*
|
|
* The new version of the directory entry. Since EXT3 structures are
|
|
* stored in intel byte order, and the name_len field could never be
|
|
* bigger than 255 chars, it's safe to reclaim the extra byte for the
|
|
* file_type field.
|
|
*/
|
|
struct ext3_dir_entry_2 {
|
|
__le32 inode; /* Inode number */
|
|
__le16 rec_len; /* Directory entry length */
|
|
__u8 name_len; /* Name length */
|
|
__u8 file_type;
|
|
char name[EXT3_NAME_LEN]; /* File name */
|
|
};
|
|
|
|
/*
|
|
* Ext3 directory file types. Only the low 3 bits are used. The
|
|
* other bits are reserved for now.
|
|
*/
|
|
#define EXT3_FT_UNKNOWN 0
|
|
#define EXT3_FT_REG_FILE 1
|
|
#define EXT3_FT_DIR 2
|
|
#define EXT3_FT_CHRDEV 3
|
|
#define EXT3_FT_BLKDEV 4
|
|
#define EXT3_FT_FIFO 5
|
|
#define EXT3_FT_SOCK 6
|
|
#define EXT3_FT_SYMLINK 7
|
|
|
|
#define EXT3_FT_MAX 8
|
|
|
|
/*
|
|
* EXT3_DIR_PAD defines the directory entries boundaries
|
|
*
|
|
* NOTE: It must be a multiple of 4
|
|
*/
|
|
#define EXT3_DIR_PAD 4
|
|
#define EXT3_DIR_ROUND (EXT3_DIR_PAD - 1)
|
|
#define EXT3_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT3_DIR_ROUND) & \
|
|
~EXT3_DIR_ROUND)
|
|
#define EXT3_MAX_REC_LEN ((1<<16)-1)
|
|
|
|
/*
|
|
* Tests against MAX_REC_LEN etc were put in place for 64k block
|
|
* sizes; if that is not possible on this arch, we can skip
|
|
* those tests and speed things up.
|
|
*/
|
|
static inline unsigned ext3_rec_len_from_disk(__le16 dlen)
|
|
{
|
|
unsigned len = le16_to_cpu(dlen);
|
|
|
|
#if (PAGE_CACHE_SIZE >= 65536)
|
|
if (len == EXT3_MAX_REC_LEN)
|
|
return 1 << 16;
|
|
#endif
|
|
return len;
|
|
}
|
|
|
|
static inline __le16 ext3_rec_len_to_disk(unsigned len)
|
|
{
|
|
#if (PAGE_CACHE_SIZE >= 65536)
|
|
if (len == (1 << 16))
|
|
return cpu_to_le16(EXT3_MAX_REC_LEN);
|
|
else if (len > (1 << 16))
|
|
BUG();
|
|
#endif
|
|
return cpu_to_le16(len);
|
|
}
|
|
|
|
/*
|
|
* Hash Tree Directory indexing
|
|
* (c) Daniel Phillips, 2001
|
|
*/
|
|
|
|
#define is_dx(dir) (EXT3_HAS_COMPAT_FEATURE(dir->i_sb, \
|
|
EXT3_FEATURE_COMPAT_DIR_INDEX) && \
|
|
(EXT3_I(dir)->i_flags & EXT3_INDEX_FL))
|
|
#define EXT3_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT3_LINK_MAX)
|
|
#define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
|
|
|
|
/* Legal values for the dx_root hash_version field: */
|
|
|
|
#define DX_HASH_LEGACY 0
|
|
#define DX_HASH_HALF_MD4 1
|
|
#define DX_HASH_TEA 2
|
|
#define DX_HASH_LEGACY_UNSIGNED 3
|
|
#define DX_HASH_HALF_MD4_UNSIGNED 4
|
|
#define DX_HASH_TEA_UNSIGNED 5
|
|
|
|
/* hash info structure used by the directory hash */
|
|
struct dx_hash_info
|
|
{
|
|
u32 hash;
|
|
u32 minor_hash;
|
|
int hash_version;
|
|
u32 *seed;
|
|
};
|
|
|
|
|
|
/* 32 and 64 bit signed EOF for dx directories */
|
|
#define EXT3_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
|
|
#define EXT3_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
|
|
|
|
|
|
/*
|
|
* Control parameters used by ext3_htree_next_block
|
|
*/
|
|
#define HASH_NB_ALWAYS 1
|
|
|
|
|
|
/*
|
|
* Describe an inode's exact location on disk and in memory
|
|
*/
|
|
struct ext3_iloc
|
|
{
|
|
struct buffer_head *bh;
|
|
unsigned long offset;
|
|
unsigned long block_group;
|
|
};
|
|
|
|
static inline struct ext3_inode *ext3_raw_inode(struct ext3_iloc *iloc)
|
|
{
|
|
return (struct ext3_inode *) (iloc->bh->b_data + iloc->offset);
|
|
}
|
|
|
|
/*
|
|
* This structure is stuffed into the struct file's private_data field
|
|
* for directories. It is where we put information so that we can do
|
|
* readdir operations in hash tree order.
|
|
*/
|
|
struct dir_private_info {
|
|
struct rb_root root;
|
|
struct rb_node *curr_node;
|
|
struct fname *extra_fname;
|
|
loff_t last_pos;
|
|
__u32 curr_hash;
|
|
__u32 curr_minor_hash;
|
|
__u32 next_hash;
|
|
};
|
|
|
|
/* calculate the first block number of the group */
|
|
static inline ext3_fsblk_t
|
|
ext3_group_first_block_no(struct super_block *sb, unsigned long group_no)
|
|
{
|
|
return group_no * (ext3_fsblk_t)EXT3_BLOCKS_PER_GROUP(sb) +
|
|
le32_to_cpu(EXT3_SB(sb)->s_es->s_first_data_block);
|
|
}
|
|
|
|
/*
|
|
* Special error return code only used by dx_probe() and its callers.
|
|
*/
|
|
#define ERR_BAD_DX_DIR -75000
|
|
|
|
/*
|
|
* Function prototypes
|
|
*/
|
|
|
|
/*
|
|
* Ok, these declarations are also in <linux/kernel.h> but none of the
|
|
* ext3 source programs needs to include it so they are duplicated here.
|
|
*/
|
|
# define NORET_TYPE /**/
|
|
# define ATTRIB_NORET __attribute__((noreturn))
|
|
# define NORET_AND noreturn,
|
|
|
|
/* balloc.c */
|
|
extern int ext3_bg_has_super(struct super_block *sb, int group);
|
|
extern unsigned long ext3_bg_num_gdb(struct super_block *sb, int group);
|
|
extern ext3_fsblk_t ext3_new_block (handle_t *handle, struct inode *inode,
|
|
ext3_fsblk_t goal, int *errp);
|
|
extern ext3_fsblk_t ext3_new_blocks (handle_t *handle, struct inode *inode,
|
|
ext3_fsblk_t goal, unsigned long *count, int *errp);
|
|
extern void ext3_free_blocks (handle_t *handle, struct inode *inode,
|
|
ext3_fsblk_t block, unsigned long count);
|
|
extern void ext3_free_blocks_sb (handle_t *handle, struct super_block *sb,
|
|
ext3_fsblk_t block, unsigned long count,
|
|
unsigned long *pdquot_freed_blocks);
|
|
extern ext3_fsblk_t ext3_count_free_blocks (struct super_block *);
|
|
extern void ext3_check_blocks_bitmap (struct super_block *);
|
|
extern struct ext3_group_desc * ext3_get_group_desc(struct super_block * sb,
|
|
unsigned int block_group,
|
|
struct buffer_head ** bh);
|
|
extern int ext3_should_retry_alloc(struct super_block *sb, int *retries);
|
|
extern void ext3_init_block_alloc_info(struct inode *);
|
|
extern void ext3_rsv_window_add(struct super_block *sb, struct ext3_reserve_window_node *rsv);
|
|
extern int ext3_trim_fs(struct super_block *sb, struct fstrim_range *range);
|
|
|
|
/* dir.c */
|
|
extern int ext3_check_dir_entry(const char *, struct inode *,
|
|
struct ext3_dir_entry_2 *,
|
|
struct buffer_head *, unsigned long);
|
|
extern int ext3_htree_store_dirent(struct file *dir_file, __u32 hash,
|
|
__u32 minor_hash,
|
|
struct ext3_dir_entry_2 *dirent);
|
|
extern void ext3_htree_free_dir_info(struct dir_private_info *p);
|
|
|
|
/* fsync.c */
|
|
extern int ext3_sync_file(struct file *, loff_t, loff_t, int);
|
|
|
|
/* hash.c */
|
|
extern int ext3fs_dirhash(const char *name, int len, struct
|
|
dx_hash_info *hinfo);
|
|
|
|
/* ialloc.c */
|
|
extern struct inode * ext3_new_inode (handle_t *, struct inode *,
|
|
const struct qstr *, umode_t);
|
|
extern void ext3_free_inode (handle_t *, struct inode *);
|
|
extern struct inode * ext3_orphan_get (struct super_block *, unsigned long);
|
|
extern unsigned long ext3_count_free_inodes (struct super_block *);
|
|
extern unsigned long ext3_count_dirs (struct super_block *);
|
|
extern void ext3_check_inodes_bitmap (struct super_block *);
|
|
extern unsigned long ext3_count_free (struct buffer_head *, unsigned);
|
|
|
|
|
|
/* inode.c */
|
|
int ext3_forget(handle_t *handle, int is_metadata, struct inode *inode,
|
|
struct buffer_head *bh, ext3_fsblk_t blocknr);
|
|
struct buffer_head * ext3_getblk (handle_t *, struct inode *, long, int, int *);
|
|
struct buffer_head * ext3_bread (handle_t *, struct inode *, int, int, int *);
|
|
int ext3_get_blocks_handle(handle_t *handle, struct inode *inode,
|
|
sector_t iblock, unsigned long maxblocks, struct buffer_head *bh_result,
|
|
int create);
|
|
|
|
extern struct inode *ext3_iget(struct super_block *, unsigned long);
|
|
extern int ext3_write_inode (struct inode *, struct writeback_control *);
|
|
extern int ext3_setattr (struct dentry *, struct iattr *);
|
|
extern void ext3_evict_inode (struct inode *);
|
|
extern int ext3_sync_inode (handle_t *, struct inode *);
|
|
extern void ext3_discard_reservation (struct inode *);
|
|
extern void ext3_dirty_inode(struct inode *, int);
|
|
extern int ext3_change_inode_journal_flag(struct inode *, int);
|
|
extern int ext3_get_inode_loc(struct inode *, struct ext3_iloc *);
|
|
extern int ext3_can_truncate(struct inode *inode);
|
|
extern void ext3_truncate(struct inode *inode);
|
|
extern void ext3_set_inode_flags(struct inode *);
|
|
extern void ext3_get_inode_flags(struct ext3_inode_info *);
|
|
extern void ext3_set_aops(struct inode *inode);
|
|
extern int ext3_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
|
|
u64 start, u64 len);
|
|
|
|
/* ioctl.c */
|
|
extern long ext3_ioctl(struct file *, unsigned int, unsigned long);
|
|
extern long ext3_compat_ioctl(struct file *, unsigned int, unsigned long);
|
|
|
|
/* namei.c */
|
|
extern int ext3_orphan_add(handle_t *, struct inode *);
|
|
extern int ext3_orphan_del(handle_t *, struct inode *);
|
|
extern int ext3_htree_fill_tree(struct file *dir_file, __u32 start_hash,
|
|
__u32 start_minor_hash, __u32 *next_hash);
|
|
|
|
/* resize.c */
|
|
extern int ext3_group_add(struct super_block *sb,
|
|
struct ext3_new_group_data *input);
|
|
extern int ext3_group_extend(struct super_block *sb,
|
|
struct ext3_super_block *es,
|
|
ext3_fsblk_t n_blocks_count);
|
|
|
|
/* super.c */
|
|
extern __printf(3, 4)
|
|
void ext3_error(struct super_block *, const char *, const char *, ...);
|
|
extern void __ext3_std_error (struct super_block *, const char *, int);
|
|
extern __printf(3, 4)
|
|
void ext3_abort(struct super_block *, const char *, const char *, ...);
|
|
extern __printf(3, 4)
|
|
void ext3_warning(struct super_block *, const char *, const char *, ...);
|
|
extern __printf(3, 4)
|
|
void ext3_msg(struct super_block *, const char *, const char *, ...);
|
|
extern void ext3_update_dynamic_rev (struct super_block *sb);
|
|
|
|
#define ext3_std_error(sb, errno) \
|
|
do { \
|
|
if ((errno)) \
|
|
__ext3_std_error((sb), __func__, (errno)); \
|
|
} while (0)
|
|
|
|
/*
|
|
* Inodes and files operations
|
|
*/
|
|
|
|
/* dir.c */
|
|
extern const struct file_operations ext3_dir_operations;
|
|
|
|
/* file.c */
|
|
extern const struct inode_operations ext3_file_inode_operations;
|
|
extern const struct file_operations ext3_file_operations;
|
|
|
|
/* namei.c */
|
|
extern const struct inode_operations ext3_dir_inode_operations;
|
|
extern const struct inode_operations ext3_special_inode_operations;
|
|
|
|
/* symlink.c */
|
|
extern const struct inode_operations ext3_symlink_inode_operations;
|
|
extern const struct inode_operations ext3_fast_symlink_inode_operations;
|
|
|
|
#define EXT3_JOURNAL(inode) (EXT3_SB((inode)->i_sb)->s_journal)
|
|
|
|
/* Define the number of blocks we need to account to a transaction to
|
|
* modify one block of data.
|
|
*
|
|
* We may have to touch one inode, one bitmap buffer, up to three
|
|
* indirection blocks, the group and superblock summaries, and the data
|
|
* block to complete the transaction. */
|
|
|
|
#define EXT3_SINGLEDATA_TRANS_BLOCKS 8U
|
|
|
|
/* Extended attribute operations touch at most two data buffers,
|
|
* two bitmap buffers, and two group summaries, in addition to the inode
|
|
* and the superblock, which are already accounted for. */
|
|
|
|
#define EXT3_XATTR_TRANS_BLOCKS 6U
|
|
|
|
/* Define the minimum size for a transaction which modifies data. This
|
|
* needs to take into account the fact that we may end up modifying two
|
|
* quota files too (one for the group, one for the user quota). The
|
|
* superblock only gets updated once, of course, so don't bother
|
|
* counting that again for the quota updates. */
|
|
|
|
#define EXT3_DATA_TRANS_BLOCKS(sb) (EXT3_SINGLEDATA_TRANS_BLOCKS + \
|
|
EXT3_XATTR_TRANS_BLOCKS - 2 + \
|
|
EXT3_MAXQUOTAS_TRANS_BLOCKS(sb))
|
|
|
|
/* Delete operations potentially hit one directory's namespace plus an
|
|
* entire inode, plus arbitrary amounts of bitmap/indirection data. Be
|
|
* generous. We can grow the delete transaction later if necessary. */
|
|
|
|
#define EXT3_DELETE_TRANS_BLOCKS(sb) (EXT3_MAXQUOTAS_TRANS_BLOCKS(sb) + 64)
|
|
|
|
/* Define an arbitrary limit for the amount of data we will anticipate
|
|
* writing to any given transaction. For unbounded transactions such as
|
|
* write(2) and truncate(2) we can write more than this, but we always
|
|
* start off at the maximum transaction size and grow the transaction
|
|
* optimistically as we go. */
|
|
|
|
#define EXT3_MAX_TRANS_DATA 64U
|
|
|
|
/* We break up a large truncate or write transaction once the handle's
|
|
* buffer credits gets this low, we need either to extend the
|
|
* transaction or to start a new one. Reserve enough space here for
|
|
* inode, bitmap, superblock, group and indirection updates for at least
|
|
* one block, plus two quota updates. Quota allocations are not
|
|
* needed. */
|
|
|
|
#define EXT3_RESERVE_TRANS_BLOCKS 12U
|
|
|
|
#define EXT3_INDEX_EXTRA_TRANS_BLOCKS 8
|
|
|
|
#ifdef CONFIG_QUOTA
|
|
/* Amount of blocks needed for quota update - we know that the structure was
|
|
* allocated so we need to update only inode+data */
|
|
#define EXT3_QUOTA_TRANS_BLOCKS(sb) (test_opt(sb, QUOTA) ? 2 : 0)
|
|
/* Amount of blocks needed for quota insert/delete - we do some block writes
|
|
* but inode, sb and group updates are done only once */
|
|
#define EXT3_QUOTA_INIT_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_INIT_ALLOC*\
|
|
(EXT3_SINGLEDATA_TRANS_BLOCKS-3)+3+DQUOT_INIT_REWRITE) : 0)
|
|
#define EXT3_QUOTA_DEL_BLOCKS(sb) (test_opt(sb, QUOTA) ? (DQUOT_DEL_ALLOC*\
|
|
(EXT3_SINGLEDATA_TRANS_BLOCKS-3)+3+DQUOT_DEL_REWRITE) : 0)
|
|
#else
|
|
#define EXT3_QUOTA_TRANS_BLOCKS(sb) 0
|
|
#define EXT3_QUOTA_INIT_BLOCKS(sb) 0
|
|
#define EXT3_QUOTA_DEL_BLOCKS(sb) 0
|
|
#endif
|
|
#define EXT3_MAXQUOTAS_TRANS_BLOCKS(sb) (MAXQUOTAS*EXT3_QUOTA_TRANS_BLOCKS(sb))
|
|
#define EXT3_MAXQUOTAS_INIT_BLOCKS(sb) (MAXQUOTAS*EXT3_QUOTA_INIT_BLOCKS(sb))
|
|
#define EXT3_MAXQUOTAS_DEL_BLOCKS(sb) (MAXQUOTAS*EXT3_QUOTA_DEL_BLOCKS(sb))
|
|
|
|
int
|
|
ext3_mark_iloc_dirty(handle_t *handle,
|
|
struct inode *inode,
|
|
struct ext3_iloc *iloc);
|
|
|
|
/*
|
|
* On success, We end up with an outstanding reference count against
|
|
* iloc->bh. This _must_ be cleaned up later.
|
|
*/
|
|
|
|
int ext3_reserve_inode_write(handle_t *handle, struct inode *inode,
|
|
struct ext3_iloc *iloc);
|
|
|
|
int ext3_mark_inode_dirty(handle_t *handle, struct inode *inode);
|
|
|
|
/*
|
|
* Wrapper functions with which ext3 calls into JBD. The intent here is
|
|
* to allow these to be turned into appropriate stubs so ext3 can control
|
|
* ext2 filesystems, so ext2+ext3 systems only nee one fs. This work hasn't
|
|
* been done yet.
|
|
*/
|
|
|
|
static inline void ext3_journal_release_buffer(handle_t *handle,
|
|
struct buffer_head *bh)
|
|
{
|
|
journal_release_buffer(handle, bh);
|
|
}
|
|
|
|
void ext3_journal_abort_handle(const char *caller, const char *err_fn,
|
|
struct buffer_head *bh, handle_t *handle, int err);
|
|
|
|
int __ext3_journal_get_undo_access(const char *where, handle_t *handle,
|
|
struct buffer_head *bh);
|
|
|
|
int __ext3_journal_get_write_access(const char *where, handle_t *handle,
|
|
struct buffer_head *bh);
|
|
|
|
int __ext3_journal_forget(const char *where, handle_t *handle,
|
|
struct buffer_head *bh);
|
|
|
|
int __ext3_journal_revoke(const char *where, handle_t *handle,
|
|
unsigned long blocknr, struct buffer_head *bh);
|
|
|
|
int __ext3_journal_get_create_access(const char *where,
|
|
handle_t *handle, struct buffer_head *bh);
|
|
|
|
int __ext3_journal_dirty_metadata(const char *where,
|
|
handle_t *handle, struct buffer_head *bh);
|
|
|
|
#define ext3_journal_get_undo_access(handle, bh) \
|
|
__ext3_journal_get_undo_access(__func__, (handle), (bh))
|
|
#define ext3_journal_get_write_access(handle, bh) \
|
|
__ext3_journal_get_write_access(__func__, (handle), (bh))
|
|
#define ext3_journal_revoke(handle, blocknr, bh) \
|
|
__ext3_journal_revoke(__func__, (handle), (blocknr), (bh))
|
|
#define ext3_journal_get_create_access(handle, bh) \
|
|
__ext3_journal_get_create_access(__func__, (handle), (bh))
|
|
#define ext3_journal_dirty_metadata(handle, bh) \
|
|
__ext3_journal_dirty_metadata(__func__, (handle), (bh))
|
|
#define ext3_journal_forget(handle, bh) \
|
|
__ext3_journal_forget(__func__, (handle), (bh))
|
|
|
|
int ext3_journal_dirty_data(handle_t *handle, struct buffer_head *bh);
|
|
|
|
handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks);
|
|
int __ext3_journal_stop(const char *where, handle_t *handle);
|
|
|
|
static inline handle_t *ext3_journal_start(struct inode *inode, int nblocks)
|
|
{
|
|
return ext3_journal_start_sb(inode->i_sb, nblocks);
|
|
}
|
|
|
|
#define ext3_journal_stop(handle) \
|
|
__ext3_journal_stop(__func__, (handle))
|
|
|
|
static inline handle_t *ext3_journal_current_handle(void)
|
|
{
|
|
return journal_current_handle();
|
|
}
|
|
|
|
static inline int ext3_journal_extend(handle_t *handle, int nblocks)
|
|
{
|
|
return journal_extend(handle, nblocks);
|
|
}
|
|
|
|
static inline int ext3_journal_restart(handle_t *handle, int nblocks)
|
|
{
|
|
return journal_restart(handle, nblocks);
|
|
}
|
|
|
|
static inline int ext3_journal_blocks_per_page(struct inode *inode)
|
|
{
|
|
return journal_blocks_per_page(inode);
|
|
}
|
|
|
|
static inline int ext3_journal_force_commit(journal_t *journal)
|
|
{
|
|
return journal_force_commit(journal);
|
|
}
|
|
|
|
/* super.c */
|
|
int ext3_force_commit(struct super_block *sb);
|
|
|
|
static inline int ext3_should_journal_data(struct inode *inode)
|
|
{
|
|
if (!S_ISREG(inode->i_mode))
|
|
return 1;
|
|
if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
|
|
return 1;
|
|
if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static inline int ext3_should_order_data(struct inode *inode)
|
|
{
|
|
if (!S_ISREG(inode->i_mode))
|
|
return 0;
|
|
if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
|
|
return 0;
|
|
if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static inline int ext3_should_writeback_data(struct inode *inode)
|
|
{
|
|
if (!S_ISREG(inode->i_mode))
|
|
return 0;
|
|
if (EXT3_I(inode)->i_flags & EXT3_JOURNAL_DATA_FL)
|
|
return 0;
|
|
if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
#include <trace/events/ext3.h>
|