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https://github.com/torvalds/linux
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50e0168cc3
As a preparation for removing ext2 non-atomic bit operations from asm/bitops.h. This converts ext2 non-atomic bit operations to little-endian bit operations. Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Acked-by: "Theodore Ts'o" <tytso@mit.edu> Cc: Andreas Dilger <adilger.kernel@dilger.ca> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2134 lines
74 KiB
C
2134 lines
74 KiB
C
/*
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* ext4.h
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*
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* Copyright (C) 1992, 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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*
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* from
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*
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* linux/include/linux/minix_fs.h
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*/
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#ifndef _EXT4_H
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#define _EXT4_H
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#include <linux/types.h>
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#include <linux/blkdev.h>
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#include <linux/magic.h>
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#include <linux/jbd2.h>
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#include <linux/quota.h>
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#include <linux/rwsem.h>
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#include <linux/rbtree.h>
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#include <linux/seqlock.h>
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#include <linux/mutex.h>
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#include <linux/timer.h>
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#include <linux/wait.h>
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#include <linux/blockgroup_lock.h>
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#include <linux/percpu_counter.h>
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#ifdef __KERNEL__
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#include <linux/compat.h>
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#endif
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/*
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* The fourth extended filesystem constants/structures
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*/
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/*
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* Define EXT4FS_DEBUG to produce debug messages
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*/
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#undef EXT4FS_DEBUG
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/*
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* Debug code
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*/
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#ifdef EXT4FS_DEBUG
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#define ext4_debug(f, a...) \
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do { \
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printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
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__FILE__, __LINE__, __func__); \
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printk(KERN_DEBUG f, ## a); \
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} while (0)
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#else
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#define ext4_debug(f, a...) do {} while (0)
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#endif
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#define EXT4_ERROR_INODE(inode, fmt, a...) \
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ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
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#define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \
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ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
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#define EXT4_ERROR_FILE(file, block, fmt, a...) \
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ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
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/* data type for block offset of block group */
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typedef int ext4_grpblk_t;
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/* data type for filesystem-wide blocks number */
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typedef unsigned long long ext4_fsblk_t;
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/* data type for file logical block number */
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typedef __u32 ext4_lblk_t;
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/* data type for block group number */
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typedef unsigned int ext4_group_t;
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/*
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* Flags used in mballoc's allocation_context flags field.
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*
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* Also used to show what's going on for debugging purposes when the
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* flag field is exported via the traceport interface
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*/
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/* prefer goal again. length */
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#define EXT4_MB_HINT_MERGE 0x0001
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/* blocks already reserved */
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#define EXT4_MB_HINT_RESERVED 0x0002
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/* metadata is being allocated */
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#define EXT4_MB_HINT_METADATA 0x0004
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/* first blocks in the file */
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#define EXT4_MB_HINT_FIRST 0x0008
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/* search for the best chunk */
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#define EXT4_MB_HINT_BEST 0x0010
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/* data is being allocated */
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#define EXT4_MB_HINT_DATA 0x0020
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/* don't preallocate (for tails) */
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#define EXT4_MB_HINT_NOPREALLOC 0x0040
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/* allocate for locality group */
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#define EXT4_MB_HINT_GROUP_ALLOC 0x0080
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/* allocate goal blocks or none */
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#define EXT4_MB_HINT_GOAL_ONLY 0x0100
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/* goal is meaningful */
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#define EXT4_MB_HINT_TRY_GOAL 0x0200
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/* blocks already pre-reserved by delayed allocation */
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#define EXT4_MB_DELALLOC_RESERVED 0x0400
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/* We are doing stream allocation */
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#define EXT4_MB_STREAM_ALLOC 0x0800
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struct ext4_allocation_request {
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/* target inode for block we're allocating */
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struct inode *inode;
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/* how many blocks we want to allocate */
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unsigned int len;
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/* logical block in target inode */
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ext4_lblk_t logical;
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/* the closest logical allocated block to the left */
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ext4_lblk_t lleft;
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/* the closest logical allocated block to the right */
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ext4_lblk_t lright;
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/* phys. target (a hint) */
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ext4_fsblk_t goal;
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/* phys. block for the closest logical allocated block to the left */
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ext4_fsblk_t pleft;
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/* phys. block for the closest logical allocated block to the right */
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ext4_fsblk_t pright;
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/* flags. see above EXT4_MB_HINT_* */
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unsigned int flags;
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};
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/*
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* Logical to physical block mapping, used by ext4_map_blocks()
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*
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* This structure is used to pass requests into ext4_map_blocks() as
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* well as to store the information returned by ext4_map_blocks(). It
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* takes less room on the stack than a struct buffer_head.
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*/
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#define EXT4_MAP_NEW (1 << BH_New)
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#define EXT4_MAP_MAPPED (1 << BH_Mapped)
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#define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
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#define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
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#define EXT4_MAP_UNINIT (1 << BH_Uninit)
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#define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
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EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
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EXT4_MAP_UNINIT)
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struct ext4_map_blocks {
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ext4_fsblk_t m_pblk;
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ext4_lblk_t m_lblk;
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unsigned int m_len;
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unsigned int m_flags;
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};
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/*
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* For delayed allocation tracking
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*/
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struct mpage_da_data {
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struct inode *inode;
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sector_t b_blocknr; /* start block number of extent */
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size_t b_size; /* size of extent */
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unsigned long b_state; /* state of the extent */
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unsigned long first_page, next_page; /* extent of pages */
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struct writeback_control *wbc;
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int io_done;
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int pages_written;
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int retval;
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};
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/*
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* Flags for ext4_io_end->flags
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*/
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#define EXT4_IO_END_UNWRITTEN 0x0001
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#define EXT4_IO_END_ERROR 0x0002
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struct ext4_io_page {
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struct page *p_page;
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atomic_t p_count;
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};
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#define MAX_IO_PAGES 128
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typedef struct ext4_io_end {
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struct list_head list; /* per-file finished IO list */
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struct inode *inode; /* file being written to */
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unsigned int flag; /* unwritten or not */
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struct page *page; /* page struct for buffer write */
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loff_t offset; /* offset in the file */
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ssize_t size; /* size of the extent */
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struct work_struct work; /* data work queue */
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struct kiocb *iocb; /* iocb struct for AIO */
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int result; /* error value for AIO */
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int num_io_pages;
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struct ext4_io_page *pages[MAX_IO_PAGES];
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} ext4_io_end_t;
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struct ext4_io_submit {
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int io_op;
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struct bio *io_bio;
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ext4_io_end_t *io_end;
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struct ext4_io_page *io_page;
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sector_t io_next_block;
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};
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/*
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* Special inodes numbers
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*/
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#define EXT4_BAD_INO 1 /* Bad blocks inode */
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#define EXT4_ROOT_INO 2 /* Root inode */
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#define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
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#define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
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#define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
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#define EXT4_JOURNAL_INO 8 /* Journal inode */
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/* First non-reserved inode for old ext4 filesystems */
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#define EXT4_GOOD_OLD_FIRST_INO 11
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/*
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* Maximal count of links to a file
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*/
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#define EXT4_LINK_MAX 65000
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/*
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* Macro-instructions used to manage several block sizes
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*/
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#define EXT4_MIN_BLOCK_SIZE 1024
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#define EXT4_MAX_BLOCK_SIZE 65536
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#define EXT4_MIN_BLOCK_LOG_SIZE 10
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#define EXT4_MAX_BLOCK_LOG_SIZE 16
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#ifdef __KERNEL__
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# define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
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#else
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# define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
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#endif
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#define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
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#ifdef __KERNEL__
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# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
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#else
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# define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
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#endif
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#ifdef __KERNEL__
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#define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
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#define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
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#define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
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#else
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#define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
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EXT4_GOOD_OLD_INODE_SIZE : \
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(s)->s_inode_size)
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#define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
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EXT4_GOOD_OLD_FIRST_INO : \
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(s)->s_first_ino)
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#endif
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#define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
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/*
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* Structure of a blocks group descriptor
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*/
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struct ext4_group_desc
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{
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__le32 bg_block_bitmap_lo; /* Blocks bitmap block */
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__le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
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__le32 bg_inode_table_lo; /* Inodes table block */
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__le16 bg_free_blocks_count_lo;/* Free blocks count */
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__le16 bg_free_inodes_count_lo;/* Free inodes count */
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__le16 bg_used_dirs_count_lo; /* Directories count */
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__le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
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__u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
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__le16 bg_itable_unused_lo; /* Unused inodes count */
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__le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
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__le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
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__le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
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__le32 bg_inode_table_hi; /* Inodes table block MSB */
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__le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
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__le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
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__le16 bg_used_dirs_count_hi; /* Directories count MSB */
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__le16 bg_itable_unused_hi; /* Unused inodes count MSB */
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__u32 bg_reserved2[3];
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};
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/*
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* Structure of a flex block group info
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*/
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struct flex_groups {
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atomic_t free_inodes;
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atomic_t free_blocks;
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atomic_t used_dirs;
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};
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#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
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#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
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#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
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/*
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* Macro-instructions used to manage group descriptors
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*/
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#define EXT4_MIN_DESC_SIZE 32
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#define EXT4_MIN_DESC_SIZE_64BIT 64
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#define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
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#define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
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#ifdef __KERNEL__
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# define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
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# define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
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# define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
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# define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
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#else
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# define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
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# define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
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# define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
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#endif
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/*
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* Constants relative to the data blocks
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*/
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#define EXT4_NDIR_BLOCKS 12
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#define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
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#define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
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#define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
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#define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
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/*
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* Inode flags
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*/
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#define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
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#define EXT4_UNRM_FL 0x00000002 /* Undelete */
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#define EXT4_COMPR_FL 0x00000004 /* Compress file */
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#define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
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#define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
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#define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
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#define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
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#define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
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/* Reserved for compression usage... */
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#define EXT4_DIRTY_FL 0x00000100
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#define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
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#define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
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#define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
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/* End compression flags --- maybe not all used */
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#define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
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#define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
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#define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
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#define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
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#define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
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#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
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#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
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#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
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#define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
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#define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
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#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
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#define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
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#define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */
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/* Flags that should be inherited by new inodes from their parent. */
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#define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
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EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\
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EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
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EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
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EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
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/* Flags that are appropriate for regular files (all but dir-specific ones). */
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#define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
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/* Flags that are appropriate for non-directories/regular files. */
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#define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
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/* Mask out flags that are inappropriate for the given type of inode. */
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static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
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{
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if (S_ISDIR(mode))
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return flags;
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else if (S_ISREG(mode))
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return flags & EXT4_REG_FLMASK;
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else
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return flags & EXT4_OTHER_FLMASK;
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}
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/*
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* Inode flags used for atomic set/get
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*/
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enum {
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EXT4_INODE_SECRM = 0, /* Secure deletion */
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EXT4_INODE_UNRM = 1, /* Undelete */
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EXT4_INODE_COMPR = 2, /* Compress file */
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EXT4_INODE_SYNC = 3, /* Synchronous updates */
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EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
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EXT4_INODE_APPEND = 5, /* writes to file may only append */
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EXT4_INODE_NODUMP = 6, /* do not dump file */
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EXT4_INODE_NOATIME = 7, /* do not update atime */
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/* Reserved for compression usage... */
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EXT4_INODE_DIRTY = 8,
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EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
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EXT4_INODE_NOCOMPR = 10, /* Don't compress */
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EXT4_INODE_ECOMPR = 11, /* Compression error */
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/* End compression flags --- maybe not all used */
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EXT4_INODE_INDEX = 12, /* hash-indexed directory */
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EXT4_INODE_IMAGIC = 13, /* AFS directory */
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EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
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EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
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EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
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EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
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EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
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EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
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EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
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EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */
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EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
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};
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#define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
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#define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \
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printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \
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EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); }
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/*
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* Since it's pretty easy to mix up bit numbers and hex values, and we
|
|
* can't do a compile-time test for ENUM values, we use a run-time
|
|
* test to make sure that EXT4_XXX_FL is consistent with respect to
|
|
* EXT4_INODE_XXX. If all is well the printk and BUG_ON will all drop
|
|
* out so it won't cost any extra space in the compiled kernel image.
|
|
* But it's important that these values are the same, since we are
|
|
* using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL
|
|
* must be consistent with the values of FS_XXX_FL defined in
|
|
* include/linux/fs.h and the on-disk values found in ext2, ext3, and
|
|
* ext4 filesystems, and of course the values defined in e2fsprogs.
|
|
*
|
|
* It's not paranoia if the Murphy's Law really *is* out to get you. :-)
|
|
*/
|
|
static inline void ext4_check_flag_values(void)
|
|
{
|
|
CHECK_FLAG_VALUE(SECRM);
|
|
CHECK_FLAG_VALUE(UNRM);
|
|
CHECK_FLAG_VALUE(COMPR);
|
|
CHECK_FLAG_VALUE(SYNC);
|
|
CHECK_FLAG_VALUE(IMMUTABLE);
|
|
CHECK_FLAG_VALUE(APPEND);
|
|
CHECK_FLAG_VALUE(NODUMP);
|
|
CHECK_FLAG_VALUE(NOATIME);
|
|
CHECK_FLAG_VALUE(DIRTY);
|
|
CHECK_FLAG_VALUE(COMPRBLK);
|
|
CHECK_FLAG_VALUE(NOCOMPR);
|
|
CHECK_FLAG_VALUE(ECOMPR);
|
|
CHECK_FLAG_VALUE(INDEX);
|
|
CHECK_FLAG_VALUE(IMAGIC);
|
|
CHECK_FLAG_VALUE(JOURNAL_DATA);
|
|
CHECK_FLAG_VALUE(NOTAIL);
|
|
CHECK_FLAG_VALUE(DIRSYNC);
|
|
CHECK_FLAG_VALUE(TOPDIR);
|
|
CHECK_FLAG_VALUE(HUGE_FILE);
|
|
CHECK_FLAG_VALUE(EXTENTS);
|
|
CHECK_FLAG_VALUE(EA_INODE);
|
|
CHECK_FLAG_VALUE(EOFBLOCKS);
|
|
CHECK_FLAG_VALUE(RESERVED);
|
|
}
|
|
|
|
/* Used to pass group descriptor data when online resize is done */
|
|
struct ext4_new_group_input {
|
|
__u32 group; /* Group number for this data */
|
|
__u64 block_bitmap; /* Absolute block number of block bitmap */
|
|
__u64 inode_bitmap; /* Absolute block number of inode bitmap */
|
|
__u64 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;
|
|
};
|
|
|
|
#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
|
|
struct compat_ext4_new_group_input {
|
|
u32 group;
|
|
compat_u64 block_bitmap;
|
|
compat_u64 inode_bitmap;
|
|
compat_u64 inode_table;
|
|
u32 blocks_count;
|
|
u16 reserved_blocks;
|
|
u16 unused;
|
|
};
|
|
#endif
|
|
|
|
/* The struct ext4_new_group_input in kernel space, with free_blocks_count */
|
|
struct ext4_new_group_data {
|
|
__u32 group;
|
|
__u64 block_bitmap;
|
|
__u64 inode_bitmap;
|
|
__u64 inode_table;
|
|
__u32 blocks_count;
|
|
__u16 reserved_blocks;
|
|
__u16 unused;
|
|
__u32 free_blocks_count;
|
|
};
|
|
|
|
/*
|
|
* Flags used by ext4_map_blocks()
|
|
*/
|
|
/* Allocate any needed blocks and/or convert an unitialized
|
|
extent to be an initialized ext4 */
|
|
#define EXT4_GET_BLOCKS_CREATE 0x0001
|
|
/* Request the creation of an unitialized extent */
|
|
#define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
|
|
#define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
|
|
EXT4_GET_BLOCKS_CREATE)
|
|
/* Caller is from the delayed allocation writeout path,
|
|
so set the magic i_delalloc_reserve_flag after taking the
|
|
inode allocation semaphore for */
|
|
#define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
|
|
/* caller is from the direct IO path, request to creation of an
|
|
unitialized extents if not allocated, split the uninitialized
|
|
extent if blocks has been preallocated already*/
|
|
#define EXT4_GET_BLOCKS_PRE_IO 0x0008
|
|
#define EXT4_GET_BLOCKS_CONVERT 0x0010
|
|
#define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
|
|
EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
|
|
/* Convert extent to initialized after IO complete */
|
|
#define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
|
|
EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
|
|
|
|
/*
|
|
* Flags used by ext4_free_blocks
|
|
*/
|
|
#define EXT4_FREE_BLOCKS_METADATA 0x0001
|
|
#define EXT4_FREE_BLOCKS_FORGET 0x0002
|
|
#define EXT4_FREE_BLOCKS_VALIDATED 0x0004
|
|
|
|
/*
|
|
* ioctl commands
|
|
*/
|
|
#define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
|
|
#define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
|
|
#define EXT4_IOC_GETVERSION _IOR('f', 3, long)
|
|
#define EXT4_IOC_SETVERSION _IOW('f', 4, long)
|
|
#define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
|
|
#define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
|
|
#ifdef CONFIG_JBD2_DEBUG
|
|
#define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
|
|
#endif
|
|
#define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
|
|
#define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
|
|
#define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
|
|
#define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
|
|
#define EXT4_IOC_MIGRATE _IO('f', 9)
|
|
/* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
|
|
/* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
|
|
#define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
|
|
#define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
|
|
|
|
#if defined(__KERNEL__) && defined(CONFIG_COMPAT)
|
|
/*
|
|
* ioctl commands in 32 bit emulation
|
|
*/
|
|
#define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
|
|
#define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
|
|
#define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
|
|
#define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
|
|
#define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
|
|
#define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
|
|
#define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
|
|
#define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
|
|
#ifdef CONFIG_JBD2_DEBUG
|
|
#define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
|
|
#endif
|
|
#define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
|
|
#define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
|
|
#endif
|
|
|
|
/* Max physical block we can address w/o extents */
|
|
#define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
|
|
|
|
/*
|
|
* Structure of an inode on the disk
|
|
*/
|
|
struct ext4_inode {
|
|
__le16 i_mode; /* File mode */
|
|
__le16 i_uid; /* Low 16 bits of Owner Uid */
|
|
__le32 i_size_lo; /* Size in bytes */
|
|
__le32 i_atime; /* Access time */
|
|
__le32 i_ctime; /* Inode Change 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_lo; /* Blocks count */
|
|
__le32 i_flags; /* File flags */
|
|
union {
|
|
struct {
|
|
__le32 l_i_version;
|
|
} linux1;
|
|
struct {
|
|
__u32 h_i_translator;
|
|
} hurd1;
|
|
struct {
|
|
__u32 m_i_reserved1;
|
|
} masix1;
|
|
} osd1; /* OS dependent 1 */
|
|
__le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
|
|
__le32 i_generation; /* File version (for NFS) */
|
|
__le32 i_file_acl_lo; /* File ACL */
|
|
__le32 i_size_high;
|
|
__le32 i_obso_faddr; /* Obsoleted fragment address */
|
|
union {
|
|
struct {
|
|
__le16 l_i_blocks_high; /* were l_i_reserved1 */
|
|
__le16 l_i_file_acl_high;
|
|
__le16 l_i_uid_high; /* these 2 fields */
|
|
__le16 l_i_gid_high; /* were reserved2[0] */
|
|
__u32 l_i_reserved2;
|
|
} linux2;
|
|
struct {
|
|
__le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
|
|
__u16 h_i_mode_high;
|
|
__u16 h_i_uid_high;
|
|
__u16 h_i_gid_high;
|
|
__u32 h_i_author;
|
|
} hurd2;
|
|
struct {
|
|
__le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
|
|
__le16 m_i_file_acl_high;
|
|
__u32 m_i_reserved2[2];
|
|
} masix2;
|
|
} osd2; /* OS dependent 2 */
|
|
__le16 i_extra_isize;
|
|
__le16 i_pad1;
|
|
__le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
|
|
__le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
|
|
__le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
|
|
__le32 i_crtime; /* File Creation time */
|
|
__le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
|
|
__le32 i_version_hi; /* high 32 bits for 64-bit version */
|
|
};
|
|
|
|
struct move_extent {
|
|
__u32 reserved; /* should be zero */
|
|
__u32 donor_fd; /* donor file descriptor */
|
|
__u64 orig_start; /* logical start offset in block for orig */
|
|
__u64 donor_start; /* logical start offset in block for donor */
|
|
__u64 len; /* block length to be moved */
|
|
__u64 moved_len; /* moved block length */
|
|
};
|
|
|
|
#define EXT4_EPOCH_BITS 2
|
|
#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
|
|
#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
|
|
|
|
/*
|
|
* Extended fields will fit into an inode if the filesystem was formatted
|
|
* with large inodes (-I 256 or larger) and there are not currently any EAs
|
|
* consuming all of the available space. For new inodes we always reserve
|
|
* enough space for the kernel's known extended fields, but for inodes
|
|
* created with an old kernel this might not have been the case. None of
|
|
* the extended inode fields is critical for correct filesystem operation.
|
|
* This macro checks if a certain field fits in the inode. Note that
|
|
* inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
|
|
*/
|
|
#define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
|
|
((offsetof(typeof(*ext4_inode), field) + \
|
|
sizeof((ext4_inode)->field)) \
|
|
<= (EXT4_GOOD_OLD_INODE_SIZE + \
|
|
(einode)->i_extra_isize)) \
|
|
|
|
static inline __le32 ext4_encode_extra_time(struct timespec *time)
|
|
{
|
|
return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
|
|
(time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
|
|
((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
|
|
}
|
|
|
|
static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
|
|
{
|
|
if (sizeof(time->tv_sec) > 4)
|
|
time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
|
|
<< 32;
|
|
time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
|
|
}
|
|
|
|
#define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
|
|
do { \
|
|
(raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
|
|
if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
|
|
(raw_inode)->xtime ## _extra = \
|
|
ext4_encode_extra_time(&(inode)->xtime); \
|
|
} while (0)
|
|
|
|
#define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
|
|
do { \
|
|
if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
|
|
(raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
|
|
if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
|
|
(raw_inode)->xtime ## _extra = \
|
|
ext4_encode_extra_time(&(einode)->xtime); \
|
|
} while (0)
|
|
|
|
#define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
|
|
do { \
|
|
(inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
|
|
if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
|
|
ext4_decode_extra_time(&(inode)->xtime, \
|
|
raw_inode->xtime ## _extra); \
|
|
else \
|
|
(inode)->xtime.tv_nsec = 0; \
|
|
} while (0)
|
|
|
|
#define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
|
|
do { \
|
|
if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
|
|
(einode)->xtime.tv_sec = \
|
|
(signed)le32_to_cpu((raw_inode)->xtime); \
|
|
if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
|
|
ext4_decode_extra_time(&(einode)->xtime, \
|
|
raw_inode->xtime ## _extra); \
|
|
else \
|
|
(einode)->xtime.tv_nsec = 0; \
|
|
} while (0)
|
|
|
|
#define i_disk_version osd1.linux1.l_i_version
|
|
|
|
#if defined(__KERNEL__) || defined(__linux__)
|
|
#define i_reserved1 osd1.linux1.l_i_reserved1
|
|
#define i_file_acl_high osd2.linux2.l_i_file_acl_high
|
|
#define i_blocks_high osd2.linux2.l_i_blocks_high
|
|
#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
|
|
|
|
#elif defined(__GNU__)
|
|
|
|
#define i_translator osd1.hurd1.h_i_translator
|
|
#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
|
|
|
|
#elif defined(__masix__)
|
|
|
|
#define i_reserved1 osd1.masix1.m_i_reserved1
|
|
#define i_file_acl_high osd2.masix2.m_i_file_acl_high
|
|
#define i_reserved2 osd2.masix2.m_i_reserved2
|
|
|
|
#endif /* defined(__KERNEL__) || defined(__linux__) */
|
|
|
|
/*
|
|
* storage for cached extent
|
|
* If ec_len == 0, then the cache is invalid.
|
|
* If ec_start == 0, then the cache represents a gap (null mapping)
|
|
*/
|
|
struct ext4_ext_cache {
|
|
ext4_fsblk_t ec_start;
|
|
ext4_lblk_t ec_block;
|
|
__u32 ec_len; /* must be 32bit to return holes */
|
|
};
|
|
|
|
/*
|
|
* fourth extended file system inode data in memory
|
|
*/
|
|
struct ext4_inode_info {
|
|
__le32 i_data[15]; /* unconverted */
|
|
__u32 i_dtime;
|
|
ext4_fsblk_t i_file_acl;
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
ext4_group_t i_block_group;
|
|
ext4_lblk_t i_dir_start_lookup;
|
|
#if (BITS_PER_LONG < 64)
|
|
unsigned long i_state_flags; /* Dynamic state flags */
|
|
#endif
|
|
unsigned long i_flags;
|
|
|
|
#ifdef CONFIG_EXT4_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 ext4_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 ext4_get_block (growth) and ext4_truncate (shrinkth).
|
|
*/
|
|
loff_t i_disksize;
|
|
|
|
/*
|
|
* i_data_sem is for serialising ext4_truncate() against
|
|
* ext4_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
|
|
* ext4 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 i_data_sem.
|
|
*/
|
|
struct rw_semaphore i_data_sem;
|
|
struct inode vfs_inode;
|
|
struct jbd2_inode *jinode;
|
|
|
|
struct ext4_ext_cache i_cached_extent;
|
|
/*
|
|
* File creation time. Its function is same as that of
|
|
* struct timespec i_{a,c,m}time in the generic inode.
|
|
*/
|
|
struct timespec i_crtime;
|
|
|
|
/* mballoc */
|
|
struct list_head i_prealloc_list;
|
|
spinlock_t i_prealloc_lock;
|
|
|
|
/* ialloc */
|
|
ext4_group_t i_last_alloc_group;
|
|
|
|
/* allocation reservation info for delalloc */
|
|
unsigned int i_reserved_data_blocks;
|
|
unsigned int i_reserved_meta_blocks;
|
|
unsigned int i_allocated_meta_blocks;
|
|
ext4_lblk_t i_da_metadata_calc_last_lblock;
|
|
int i_da_metadata_calc_len;
|
|
|
|
/* on-disk additional length */
|
|
__u16 i_extra_isize;
|
|
|
|
#ifdef CONFIG_QUOTA
|
|
/* quota space reservation, managed internally by quota code */
|
|
qsize_t i_reserved_quota;
|
|
#endif
|
|
|
|
/* completed IOs that might need unwritten extents handling */
|
|
struct list_head i_completed_io_list;
|
|
spinlock_t i_completed_io_lock;
|
|
atomic_t i_ioend_count; /* Number of outstanding io_end structs */
|
|
/* current io_end structure for async DIO write*/
|
|
ext4_io_end_t *cur_aio_dio;
|
|
atomic_t i_aiodio_unwritten; /* Nr. of inflight conversions pending */
|
|
|
|
spinlock_t i_block_reservation_lock;
|
|
|
|
/*
|
|
* Transactions that contain inode's metadata needed to complete
|
|
* fsync and fdatasync, respectively.
|
|
*/
|
|
tid_t i_sync_tid;
|
|
tid_t i_datasync_tid;
|
|
};
|
|
|
|
/*
|
|
* File system states
|
|
*/
|
|
#define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
|
|
#define EXT4_ERROR_FS 0x0002 /* Errors detected */
|
|
#define EXT4_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 EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
|
|
#define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
|
|
#define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
|
|
#define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
|
|
#define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
|
|
#define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
|
|
#define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
|
|
#define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
|
|
#define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
|
|
#define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
|
|
#define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
|
|
#define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
|
|
#define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
|
|
#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
|
|
#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
|
|
#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
|
|
#define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
|
|
#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
|
|
#define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
|
|
#define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
|
|
#define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
|
|
#define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
|
|
#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
|
|
#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
|
|
#define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
|
|
#define EXT4_MOUNT_MBLK_IO_SUBMIT 0x4000000 /* multi-block io submits */
|
|
#define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
|
|
#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
|
|
#define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
|
|
#define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
|
|
#define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
|
|
|
|
#define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
|
|
~EXT4_MOUNT_##opt
|
|
#define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
|
|
EXT4_MOUNT_##opt
|
|
#define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
|
|
EXT4_MOUNT_##opt)
|
|
|
|
#define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
|
|
~EXT4_MOUNT2_##opt
|
|
#define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
|
|
EXT4_MOUNT2_##opt
|
|
#define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
|
|
EXT4_MOUNT2_##opt)
|
|
|
|
#define ext4_set_bit __test_and_set_bit_le
|
|
#define ext4_set_bit_atomic ext2_set_bit_atomic
|
|
#define ext4_clear_bit __test_and_clear_bit_le
|
|
#define ext4_clear_bit_atomic ext2_clear_bit_atomic
|
|
#define ext4_test_bit test_bit_le
|
|
#define ext4_find_first_zero_bit find_first_zero_bit_le
|
|
#define ext4_find_next_zero_bit find_next_zero_bit_le
|
|
#define ext4_find_next_bit find_next_bit_le
|
|
|
|
/*
|
|
* Maximal mount counts between two filesystem checks
|
|
*/
|
|
#define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
|
|
#define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
|
|
|
|
/*
|
|
* Behaviour when detecting errors
|
|
*/
|
|
#define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
|
|
#define EXT4_ERRORS_RO 2 /* Remount fs read-only */
|
|
#define EXT4_ERRORS_PANIC 3 /* Panic */
|
|
#define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
|
|
|
|
/*
|
|
* Structure of the super block
|
|
*/
|
|
struct ext4_super_block {
|
|
/*00*/ __le32 s_inodes_count; /* Inodes count */
|
|
__le32 s_blocks_count_lo; /* Blocks count */
|
|
__le32 s_r_blocks_count_lo; /* Reserved blocks count */
|
|
__le32 s_free_blocks_count_lo; /* 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_obso_log_frag_size; /* Obsoleted fragment size */
|
|
/*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
|
|
__le32 s_obso_frags_per_group; /* Obsoleted 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 EXT4_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 EXT4_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 EXT4_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_jnl_backup_type;
|
|
__le16 s_desc_size; /* size of group descriptor */
|
|
/*100*/ __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_pad;
|
|
__le16 s_reserved_pad;
|
|
__le64 s_kbytes_written; /* nr of lifetime kilobytes written */
|
|
__le32 s_snapshot_inum; /* Inode number of active snapshot */
|
|
__le32 s_snapshot_id; /* sequential ID of active snapshot */
|
|
__le64 s_snapshot_r_blocks_count; /* reserved blocks for active
|
|
snapshot's future use */
|
|
__le32 s_snapshot_list; /* inode number of the head of the
|
|
on-disk snapshot list */
|
|
#define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
|
|
__le32 s_error_count; /* number of fs errors */
|
|
__le32 s_first_error_time; /* first time an error happened */
|
|
__le32 s_first_error_ino; /* inode involved in first error */
|
|
__le64 s_first_error_block; /* block involved of first error */
|
|
__u8 s_first_error_func[32]; /* function where the error happened */
|
|
__le32 s_first_error_line; /* line number where error happened */
|
|
__le32 s_last_error_time; /* most recent time of an error */
|
|
__le32 s_last_error_ino; /* inode involved in last error */
|
|
__le32 s_last_error_line; /* line number where error happened */
|
|
__le64 s_last_error_block; /* block involved of last error */
|
|
__u8 s_last_error_func[32]; /* function where the error happened */
|
|
#define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
|
|
__u8 s_mount_opts[64];
|
|
__le32 s_reserved[112]; /* Padding to the end of the block */
|
|
};
|
|
|
|
#define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
/*
|
|
* run-time mount flags
|
|
*/
|
|
#define EXT4_MF_MNTDIR_SAMPLED 0x0001
|
|
#define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
|
|
|
|
/*
|
|
* fourth extended-fs super-block data in memory
|
|
*/
|
|
struct ext4_sb_info {
|
|
unsigned long s_desc_size; /* Size of a group descriptor in bytes */
|
|
unsigned long s_inodes_per_block;/* Number of inodes per block */
|
|
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 */
|
|
ext4_group_t s_groups_count; /* Number of groups in the fs */
|
|
ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
|
|
unsigned long s_overhead_last; /* Last calculated overhead */
|
|
unsigned long s_blocks_last; /* Last seen block count */
|
|
loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
|
|
struct buffer_head * s_sbh; /* Buffer containing the super block */
|
|
struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
|
|
struct buffer_head **s_group_desc;
|
|
unsigned int s_mount_opt;
|
|
unsigned int s_mount_opt2;
|
|
unsigned int s_mount_flags;
|
|
ext4_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;
|
|
unsigned int s_inode_readahead_blks;
|
|
unsigned int s_inode_goal;
|
|
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 percpu_counter s_dirtyblocks_counter;
|
|
struct blockgroup_lock *s_blockgroup_lock;
|
|
struct proc_dir_entry *s_proc;
|
|
struct kobject s_kobj;
|
|
struct completion s_kobj_unregister;
|
|
|
|
/* Journaling */
|
|
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;
|
|
u32 s_max_batch_time;
|
|
u32 s_min_batch_time;
|
|
struct block_device *journal_bdev;
|
|
#ifdef CONFIG_JBD2_DEBUG
|
|
struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */
|
|
wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */
|
|
#endif
|
|
#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
|
|
unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
|
|
struct rb_root system_blks;
|
|
|
|
#ifdef EXTENTS_STATS
|
|
/* ext4 extents stats */
|
|
unsigned long s_ext_min;
|
|
unsigned long s_ext_max;
|
|
unsigned long s_depth_max;
|
|
spinlock_t s_ext_stats_lock;
|
|
unsigned long s_ext_blocks;
|
|
unsigned long s_ext_extents;
|
|
#endif
|
|
|
|
/* for buddy allocator */
|
|
struct ext4_group_info ***s_group_info;
|
|
struct inode *s_buddy_cache;
|
|
spinlock_t s_md_lock;
|
|
unsigned short *s_mb_offsets;
|
|
unsigned int *s_mb_maxs;
|
|
|
|
/* tunables */
|
|
unsigned long s_stripe;
|
|
unsigned int s_mb_stream_request;
|
|
unsigned int s_mb_max_to_scan;
|
|
unsigned int s_mb_min_to_scan;
|
|
unsigned int s_mb_stats;
|
|
unsigned int s_mb_order2_reqs;
|
|
unsigned int s_mb_group_prealloc;
|
|
unsigned int s_max_writeback_mb_bump;
|
|
/* where last allocation was done - for stream allocation */
|
|
unsigned long s_mb_last_group;
|
|
unsigned long s_mb_last_start;
|
|
|
|
/* stats for buddy allocator */
|
|
atomic_t s_bal_reqs; /* number of reqs with len > 1 */
|
|
atomic_t s_bal_success; /* we found long enough chunks */
|
|
atomic_t s_bal_allocated; /* in blocks */
|
|
atomic_t s_bal_ex_scanned; /* total extents scanned */
|
|
atomic_t s_bal_goals; /* goal hits */
|
|
atomic_t s_bal_breaks; /* too long searches */
|
|
atomic_t s_bal_2orders; /* 2^order hits */
|
|
spinlock_t s_bal_lock;
|
|
unsigned long s_mb_buddies_generated;
|
|
unsigned long long s_mb_generation_time;
|
|
atomic_t s_mb_lost_chunks;
|
|
atomic_t s_mb_preallocated;
|
|
atomic_t s_mb_discarded;
|
|
atomic_t s_lock_busy;
|
|
|
|
/* locality groups */
|
|
struct ext4_locality_group __percpu *s_locality_groups;
|
|
|
|
/* for write statistics */
|
|
unsigned long s_sectors_written_start;
|
|
u64 s_kbytes_written;
|
|
|
|
unsigned int s_log_groups_per_flex;
|
|
struct flex_groups *s_flex_groups;
|
|
|
|
/* workqueue for dio unwritten */
|
|
struct workqueue_struct *dio_unwritten_wq;
|
|
|
|
/* timer for periodic error stats printing */
|
|
struct timer_list s_err_report;
|
|
|
|
/* Lazy inode table initialization info */
|
|
struct ext4_li_request *s_li_request;
|
|
/* Wait multiplier for lazy initialization thread */
|
|
unsigned int s_li_wait_mult;
|
|
};
|
|
|
|
static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
|
|
{
|
|
return sb->s_fs_info;
|
|
}
|
|
static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
|
|
{
|
|
return container_of(inode, struct ext4_inode_info, vfs_inode);
|
|
}
|
|
|
|
static inline struct timespec ext4_current_time(struct inode *inode)
|
|
{
|
|
return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
|
|
current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
|
|
}
|
|
|
|
static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
|
|
{
|
|
return ino == EXT4_ROOT_INO ||
|
|
ino == EXT4_JOURNAL_INO ||
|
|
ino == EXT4_RESIZE_INO ||
|
|
(ino >= EXT4_FIRST_INO(sb) &&
|
|
ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
|
|
}
|
|
|
|
/*
|
|
* Inode dynamic state flags
|
|
*/
|
|
enum {
|
|
EXT4_STATE_JDATA, /* journaled data exists */
|
|
EXT4_STATE_NEW, /* inode is newly created */
|
|
EXT4_STATE_XATTR, /* has in-inode xattrs */
|
|
EXT4_STATE_NO_EXPAND, /* No space for expansion */
|
|
EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
|
|
EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
|
|
EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
|
|
EXT4_STATE_NEWENTRY, /* File just added to dir */
|
|
EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */
|
|
};
|
|
|
|
#define EXT4_INODE_BIT_FNS(name, field, offset) \
|
|
static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
|
|
{ \
|
|
return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
|
|
} \
|
|
static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
|
|
{ \
|
|
set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
|
|
} \
|
|
static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
|
|
{ \
|
|
clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
|
|
}
|
|
|
|
EXT4_INODE_BIT_FNS(flag, flags, 0)
|
|
#if (BITS_PER_LONG < 64)
|
|
EXT4_INODE_BIT_FNS(state, state_flags, 0)
|
|
|
|
static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
|
|
{
|
|
(ei)->i_state_flags = 0;
|
|
}
|
|
#else
|
|
EXT4_INODE_BIT_FNS(state, flags, 32)
|
|
|
|
static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
|
|
{
|
|
/* We depend on the fact that callers will set i_flags */
|
|
}
|
|
#endif
|
|
#else
|
|
/* Assume that user mode programs are passing in an ext4fs superblock, not
|
|
* a kernel struct super_block. This will allow us to call the feature-test
|
|
* macros from user land. */
|
|
#define EXT4_SB(sb) (sb)
|
|
#endif
|
|
|
|
#define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
|
|
|
|
/*
|
|
* Codes for operating systems
|
|
*/
|
|
#define EXT4_OS_LINUX 0
|
|
#define EXT4_OS_HURD 1
|
|
#define EXT4_OS_MASIX 2
|
|
#define EXT4_OS_FREEBSD 3
|
|
#define EXT4_OS_LITES 4
|
|
|
|
/*
|
|
* Revision levels
|
|
*/
|
|
#define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
|
|
#define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
|
|
|
|
#define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
|
|
#define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
|
|
|
|
#define EXT4_GOOD_OLD_INODE_SIZE 128
|
|
|
|
/*
|
|
* Feature set definitions
|
|
*/
|
|
|
|
#define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
|
|
((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
|
|
#define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
|
|
((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
|
|
#define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
|
|
((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
|
|
#define EXT4_SET_COMPAT_FEATURE(sb,mask) \
|
|
EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
|
|
#define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
|
|
EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
|
|
#define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
|
|
EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
|
|
#define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
|
|
EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
|
|
#define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
|
|
EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
|
|
#define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
|
|
EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
|
|
|
|
#define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
|
|
#define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
|
|
#define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
|
|
#define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
|
|
#define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
|
|
#define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
|
|
|
|
#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
|
|
#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
|
|
#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
|
|
#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
|
|
#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
|
|
#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
|
|
#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
|
|
|
|
#define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
|
|
#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
|
|
#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
|
|
#define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
|
|
#define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
|
|
#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
|
|
#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
|
|
#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
|
|
#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
|
|
#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
|
|
#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
|
|
|
|
#define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
|
|
#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
|
|
EXT4_FEATURE_INCOMPAT_RECOVER| \
|
|
EXT4_FEATURE_INCOMPAT_META_BG| \
|
|
EXT4_FEATURE_INCOMPAT_EXTENTS| \
|
|
EXT4_FEATURE_INCOMPAT_64BIT| \
|
|
EXT4_FEATURE_INCOMPAT_FLEX_BG)
|
|
#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
|
|
EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
|
|
EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
|
|
EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
|
|
EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
|
|
EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
|
|
EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
|
|
|
|
/*
|
|
* Default values for user and/or group using reserved blocks
|
|
*/
|
|
#define EXT4_DEF_RESUID 0
|
|
#define EXT4_DEF_RESGID 0
|
|
|
|
#define EXT4_DEF_INODE_READAHEAD_BLKS 32
|
|
|
|
/*
|
|
* Default mount options
|
|
*/
|
|
#define EXT4_DEFM_DEBUG 0x0001
|
|
#define EXT4_DEFM_BSDGROUPS 0x0002
|
|
#define EXT4_DEFM_XATTR_USER 0x0004
|
|
#define EXT4_DEFM_ACL 0x0008
|
|
#define EXT4_DEFM_UID16 0x0010
|
|
#define EXT4_DEFM_JMODE 0x0060
|
|
#define EXT4_DEFM_JMODE_DATA 0x0020
|
|
#define EXT4_DEFM_JMODE_ORDERED 0x0040
|
|
#define EXT4_DEFM_JMODE_WBACK 0x0060
|
|
#define EXT4_DEFM_NOBARRIER 0x0100
|
|
#define EXT4_DEFM_BLOCK_VALIDITY 0x0200
|
|
#define EXT4_DEFM_DISCARD 0x0400
|
|
#define EXT4_DEFM_NODELALLOC 0x0800
|
|
|
|
/*
|
|
* Default journal batch times
|
|
*/
|
|
#define EXT4_DEF_MIN_BATCH_TIME 0
|
|
#define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
|
|
|
|
/*
|
|
* Minimum number of groups in a flexgroup before we separate out
|
|
* directories into the first block group of a flexgroup
|
|
*/
|
|
#define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
|
|
|
|
/*
|
|
* Structure of a directory entry
|
|
*/
|
|
#define EXT4_NAME_LEN 255
|
|
|
|
struct ext4_dir_entry {
|
|
__le32 inode; /* Inode number */
|
|
__le16 rec_len; /* Directory entry length */
|
|
__le16 name_len; /* Name length */
|
|
char name[EXT4_NAME_LEN]; /* File name */
|
|
};
|
|
|
|
/*
|
|
* The new version of the directory entry. Since EXT4 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 ext4_dir_entry_2 {
|
|
__le32 inode; /* Inode number */
|
|
__le16 rec_len; /* Directory entry length */
|
|
__u8 name_len; /* Name length */
|
|
__u8 file_type;
|
|
char name[EXT4_NAME_LEN]; /* File name */
|
|
};
|
|
|
|
/*
|
|
* Ext4 directory file types. Only the low 3 bits are used. The
|
|
* other bits are reserved for now.
|
|
*/
|
|
#define EXT4_FT_UNKNOWN 0
|
|
#define EXT4_FT_REG_FILE 1
|
|
#define EXT4_FT_DIR 2
|
|
#define EXT4_FT_CHRDEV 3
|
|
#define EXT4_FT_BLKDEV 4
|
|
#define EXT4_FT_FIFO 5
|
|
#define EXT4_FT_SOCK 6
|
|
#define EXT4_FT_SYMLINK 7
|
|
|
|
#define EXT4_FT_MAX 8
|
|
|
|
/*
|
|
* EXT4_DIR_PAD defines the directory entries boundaries
|
|
*
|
|
* NOTE: It must be a multiple of 4
|
|
*/
|
|
#define EXT4_DIR_PAD 4
|
|
#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
|
|
#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
|
|
~EXT4_DIR_ROUND)
|
|
#define EXT4_MAX_REC_LEN ((1<<16)-1)
|
|
|
|
/*
|
|
* If we ever get support for fs block sizes > page_size, we'll need
|
|
* to remove the #if statements in the next two functions...
|
|
*/
|
|
static inline unsigned int
|
|
ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
|
|
{
|
|
unsigned len = le16_to_cpu(dlen);
|
|
|
|
#if (PAGE_CACHE_SIZE >= 65536)
|
|
if (len == EXT4_MAX_REC_LEN || len == 0)
|
|
return blocksize;
|
|
return (len & 65532) | ((len & 3) << 16);
|
|
#else
|
|
return len;
|
|
#endif
|
|
}
|
|
|
|
static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
|
|
{
|
|
if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
|
|
BUG();
|
|
#if (PAGE_CACHE_SIZE >= 65536)
|
|
if (len < 65536)
|
|
return cpu_to_le16(len);
|
|
if (len == blocksize) {
|
|
if (blocksize == 65536)
|
|
return cpu_to_le16(EXT4_MAX_REC_LEN);
|
|
else
|
|
return cpu_to_le16(0);
|
|
}
|
|
return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
|
|
#else
|
|
return cpu_to_le16(len);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Hash Tree Directory indexing
|
|
* (c) Daniel Phillips, 2001
|
|
*/
|
|
|
|
#define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
|
|
EXT4_FEATURE_COMPAT_DIR_INDEX) && \
|
|
ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
|
|
#define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
|
|
#define EXT4_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
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
/* hash info structure used by the directory hash */
|
|
struct dx_hash_info
|
|
{
|
|
u32 hash;
|
|
u32 minor_hash;
|
|
int hash_version;
|
|
u32 *seed;
|
|
};
|
|
|
|
#define EXT4_HTREE_EOF 0x7fffffff
|
|
|
|
/*
|
|
* Control parameters used by ext4_htree_next_block
|
|
*/
|
|
#define HASH_NB_ALWAYS 1
|
|
|
|
|
|
/*
|
|
* Describe an inode's exact location on disk and in memory
|
|
*/
|
|
struct ext4_iloc
|
|
{
|
|
struct buffer_head *bh;
|
|
unsigned long offset;
|
|
ext4_group_t block_group;
|
|
};
|
|
|
|
static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
|
|
{
|
|
return (struct ext4_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 ext4_fsblk_t
|
|
ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
|
|
{
|
|
return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
|
|
le32_to_cpu(EXT4_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
|
|
|
|
void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
|
|
ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
|
|
|
|
/*
|
|
* Timeout and state flag for lazy initialization inode thread.
|
|
*/
|
|
#define EXT4_DEF_LI_WAIT_MULT 10
|
|
#define EXT4_DEF_LI_MAX_START_DELAY 5
|
|
#define EXT4_LAZYINIT_QUIT 0x0001
|
|
#define EXT4_LAZYINIT_RUNNING 0x0002
|
|
|
|
/*
|
|
* Lazy inode table initialization info
|
|
*/
|
|
struct ext4_lazy_init {
|
|
unsigned long li_state;
|
|
|
|
wait_queue_head_t li_wait_daemon;
|
|
wait_queue_head_t li_wait_task;
|
|
struct timer_list li_timer;
|
|
struct task_struct *li_task;
|
|
|
|
struct list_head li_request_list;
|
|
struct mutex li_list_mtx;
|
|
};
|
|
|
|
struct ext4_li_request {
|
|
struct super_block *lr_super;
|
|
struct ext4_sb_info *lr_sbi;
|
|
ext4_group_t lr_next_group;
|
|
struct list_head lr_request;
|
|
unsigned long lr_next_sched;
|
|
unsigned long lr_timeout;
|
|
};
|
|
|
|
struct ext4_features {
|
|
struct kobject f_kobj;
|
|
struct completion f_kobj_unregister;
|
|
};
|
|
|
|
/*
|
|
* Function prototypes
|
|
*/
|
|
|
|
/*
|
|
* Ok, these declarations are also in <linux/kernel.h> but none of the
|
|
* ext4 source programs needs to include it so they are duplicated here.
|
|
*/
|
|
# define NORET_TYPE /**/
|
|
# define ATTRIB_NORET __attribute__((noreturn))
|
|
# define NORET_AND noreturn,
|
|
|
|
/* bitmap.c */
|
|
extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
|
|
|
|
/* balloc.c */
|
|
extern unsigned int ext4_block_group(struct super_block *sb,
|
|
ext4_fsblk_t blocknr);
|
|
extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
|
|
ext4_fsblk_t blocknr);
|
|
extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
|
|
extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
|
|
ext4_group_t group);
|
|
extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
|
|
ext4_fsblk_t goal, unsigned long *count, int *errp);
|
|
extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
|
|
extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
|
|
ext4_fsblk_t block, unsigned long count);
|
|
extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
|
|
extern void ext4_check_blocks_bitmap(struct super_block *);
|
|
extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
|
|
ext4_group_t block_group,
|
|
struct buffer_head ** bh);
|
|
extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
|
|
struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
|
|
ext4_group_t block_group);
|
|
extern unsigned ext4_init_block_bitmap(struct super_block *sb,
|
|
struct buffer_head *bh,
|
|
ext4_group_t group,
|
|
struct ext4_group_desc *desc);
|
|
#define ext4_free_blocks_after_init(sb, group, desc) \
|
|
ext4_init_block_bitmap(sb, NULL, group, desc)
|
|
|
|
/* dir.c */
|
|
extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
|
|
struct file *,
|
|
struct ext4_dir_entry_2 *,
|
|
struct buffer_head *, unsigned int);
|
|
#define ext4_check_dir_entry(dir, filp, de, bh, offset) \
|
|
unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
|
|
(de), (bh), (offset)))
|
|
extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
|
|
__u32 minor_hash,
|
|
struct ext4_dir_entry_2 *dirent);
|
|
extern void ext4_htree_free_dir_info(struct dir_private_info *p);
|
|
|
|
/* fsync.c */
|
|
extern int ext4_sync_file(struct file *, int);
|
|
extern int ext4_flush_completed_IO(struct inode *);
|
|
|
|
/* hash.c */
|
|
extern int ext4fs_dirhash(const char *name, int len, struct
|
|
dx_hash_info *hinfo);
|
|
|
|
/* ialloc.c */
|
|
extern struct inode *ext4_new_inode(handle_t *, struct inode *, int,
|
|
const struct qstr *qstr, __u32 goal);
|
|
extern void ext4_free_inode(handle_t *, struct inode *);
|
|
extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
|
|
extern unsigned long ext4_count_free_inodes(struct super_block *);
|
|
extern unsigned long ext4_count_dirs(struct super_block *);
|
|
extern void ext4_check_inodes_bitmap(struct super_block *);
|
|
extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
|
|
extern int ext4_init_inode_table(struct super_block *sb,
|
|
ext4_group_t group, int barrier);
|
|
|
|
/* mballoc.c */
|
|
extern long ext4_mb_stats;
|
|
extern long ext4_mb_max_to_scan;
|
|
extern int ext4_mb_init(struct super_block *, int);
|
|
extern int ext4_mb_release(struct super_block *);
|
|
extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
|
|
struct ext4_allocation_request *, int *);
|
|
extern int ext4_mb_reserve_blocks(struct super_block *, int);
|
|
extern void ext4_discard_preallocations(struct inode *);
|
|
extern int __init ext4_init_mballoc(void);
|
|
extern void ext4_exit_mballoc(void);
|
|
extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
|
|
struct buffer_head *bh, ext4_fsblk_t block,
|
|
unsigned long count, int flags);
|
|
extern int ext4_mb_add_groupinfo(struct super_block *sb,
|
|
ext4_group_t i, struct ext4_group_desc *desc);
|
|
extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
|
|
|
|
/* inode.c */
|
|
struct buffer_head *ext4_getblk(handle_t *, struct inode *,
|
|
ext4_lblk_t, int, int *);
|
|
struct buffer_head *ext4_bread(handle_t *, struct inode *,
|
|
ext4_lblk_t, int, int *);
|
|
int ext4_get_block(struct inode *inode, sector_t iblock,
|
|
struct buffer_head *bh_result, int create);
|
|
|
|
extern struct inode *ext4_iget(struct super_block *, unsigned long);
|
|
extern int ext4_write_inode(struct inode *, struct writeback_control *);
|
|
extern int ext4_setattr(struct dentry *, struct iattr *);
|
|
extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
|
|
struct kstat *stat);
|
|
extern void ext4_evict_inode(struct inode *);
|
|
extern void ext4_clear_inode(struct inode *);
|
|
extern int ext4_sync_inode(handle_t *, struct inode *);
|
|
extern void ext4_dirty_inode(struct inode *);
|
|
extern int ext4_change_inode_journal_flag(struct inode *, int);
|
|
extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
|
|
extern int ext4_can_truncate(struct inode *inode);
|
|
extern void ext4_truncate(struct inode *);
|
|
extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
|
|
extern void ext4_set_inode_flags(struct inode *);
|
|
extern void ext4_get_inode_flags(struct ext4_inode_info *);
|
|
extern int ext4_alloc_da_blocks(struct inode *inode);
|
|
extern void ext4_set_aops(struct inode *inode);
|
|
extern int ext4_writepage_trans_blocks(struct inode *);
|
|
extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
|
|
extern int ext4_block_truncate_page(handle_t *handle,
|
|
struct address_space *mapping, loff_t from);
|
|
extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
|
|
extern qsize_t *ext4_get_reserved_space(struct inode *inode);
|
|
extern void ext4_da_update_reserve_space(struct inode *inode,
|
|
int used, int quota_claim);
|
|
/* ioctl.c */
|
|
extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
|
|
extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
|
|
|
|
/* migrate.c */
|
|
extern int ext4_ext_migrate(struct inode *);
|
|
|
|
/* namei.c */
|
|
extern int ext4_orphan_add(handle_t *, struct inode *);
|
|
extern int ext4_orphan_del(handle_t *, struct inode *);
|
|
extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
|
|
__u32 start_minor_hash, __u32 *next_hash);
|
|
|
|
/* resize.c */
|
|
extern int ext4_group_add(struct super_block *sb,
|
|
struct ext4_new_group_data *input);
|
|
extern int ext4_group_extend(struct super_block *sb,
|
|
struct ext4_super_block *es,
|
|
ext4_fsblk_t n_blocks_count);
|
|
|
|
/* super.c */
|
|
extern void __ext4_error(struct super_block *, const char *, unsigned int,
|
|
const char *, ...)
|
|
__attribute__ ((format (printf, 4, 5)));
|
|
#define ext4_error(sb, message...) __ext4_error(sb, __func__, \
|
|
__LINE__, ## message)
|
|
extern void ext4_error_inode(struct inode *, const char *, unsigned int,
|
|
ext4_fsblk_t, const char *, ...)
|
|
__attribute__ ((format (printf, 5, 6)));
|
|
extern void ext4_error_file(struct file *, const char *, unsigned int,
|
|
ext4_fsblk_t, const char *, ...)
|
|
__attribute__ ((format (printf, 5, 6)));
|
|
extern void __ext4_std_error(struct super_block *, const char *,
|
|
unsigned int, int);
|
|
extern void __ext4_abort(struct super_block *, const char *, unsigned int,
|
|
const char *, ...)
|
|
__attribute__ ((format (printf, 4, 5)));
|
|
#define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \
|
|
__LINE__, ## message)
|
|
extern void __ext4_warning(struct super_block *, const char *, unsigned int,
|
|
const char *, ...)
|
|
__attribute__ ((format (printf, 4, 5)));
|
|
#define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \
|
|
__LINE__, ## message)
|
|
extern void ext4_msg(struct super_block *, const char *, const char *, ...)
|
|
__attribute__ ((format (printf, 3, 4)));
|
|
extern void __ext4_grp_locked_error(const char *, unsigned int, \
|
|
struct super_block *, ext4_group_t, \
|
|
unsigned long, ext4_fsblk_t, \
|
|
const char *, ...)
|
|
__attribute__ ((format (printf, 7, 8)));
|
|
#define ext4_grp_locked_error(sb, grp, message...) \
|
|
__ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message)
|
|
extern void ext4_update_dynamic_rev(struct super_block *sb);
|
|
extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
|
|
__u32 compat);
|
|
extern int ext4_update_rocompat_feature(handle_t *handle,
|
|
struct super_block *sb, __u32 rocompat);
|
|
extern int ext4_update_incompat_feature(handle_t *handle,
|
|
struct super_block *sb, __u32 incompat);
|
|
extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
|
|
struct ext4_group_desc *bg);
|
|
extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
|
|
struct ext4_group_desc *bg);
|
|
extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
|
|
struct ext4_group_desc *bg);
|
|
extern __u32 ext4_free_blks_count(struct super_block *sb,
|
|
struct ext4_group_desc *bg);
|
|
extern __u32 ext4_free_inodes_count(struct super_block *sb,
|
|
struct ext4_group_desc *bg);
|
|
extern __u32 ext4_used_dirs_count(struct super_block *sb,
|
|
struct ext4_group_desc *bg);
|
|
extern __u32 ext4_itable_unused_count(struct super_block *sb,
|
|
struct ext4_group_desc *bg);
|
|
extern void ext4_block_bitmap_set(struct super_block *sb,
|
|
struct ext4_group_desc *bg, ext4_fsblk_t blk);
|
|
extern void ext4_inode_bitmap_set(struct super_block *sb,
|
|
struct ext4_group_desc *bg, ext4_fsblk_t blk);
|
|
extern void ext4_inode_table_set(struct super_block *sb,
|
|
struct ext4_group_desc *bg, ext4_fsblk_t blk);
|
|
extern void ext4_free_blks_set(struct super_block *sb,
|
|
struct ext4_group_desc *bg, __u32 count);
|
|
extern void ext4_free_inodes_set(struct super_block *sb,
|
|
struct ext4_group_desc *bg, __u32 count);
|
|
extern void ext4_used_dirs_set(struct super_block *sb,
|
|
struct ext4_group_desc *bg, __u32 count);
|
|
extern void ext4_itable_unused_set(struct super_block *sb,
|
|
struct ext4_group_desc *bg, __u32 count);
|
|
extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group,
|
|
struct ext4_group_desc *gdp);
|
|
extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group,
|
|
struct ext4_group_desc *gdp);
|
|
|
|
static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
|
|
{
|
|
return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
|
|
le32_to_cpu(es->s_blocks_count_lo);
|
|
}
|
|
|
|
static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
|
|
{
|
|
return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
|
|
le32_to_cpu(es->s_r_blocks_count_lo);
|
|
}
|
|
|
|
static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
|
|
{
|
|
return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
|
|
le32_to_cpu(es->s_free_blocks_count_lo);
|
|
}
|
|
|
|
static inline void ext4_blocks_count_set(struct ext4_super_block *es,
|
|
ext4_fsblk_t blk)
|
|
{
|
|
es->s_blocks_count_lo = cpu_to_le32((u32)blk);
|
|
es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
|
|
}
|
|
|
|
static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
|
|
ext4_fsblk_t blk)
|
|
{
|
|
es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
|
|
es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
|
|
}
|
|
|
|
static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
|
|
ext4_fsblk_t blk)
|
|
{
|
|
es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
|
|
es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
|
|
}
|
|
|
|
static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
|
|
{
|
|
if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
|
|
return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
|
|
le32_to_cpu(raw_inode->i_size_lo);
|
|
else
|
|
return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
|
|
}
|
|
|
|
static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
|
|
{
|
|
raw_inode->i_size_lo = cpu_to_le32(i_size);
|
|
raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
|
|
}
|
|
|
|
static inline
|
|
struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
|
|
ext4_group_t group)
|
|
{
|
|
struct ext4_group_info ***grp_info;
|
|
long indexv, indexh;
|
|
grp_info = EXT4_SB(sb)->s_group_info;
|
|
indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
|
|
indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
|
|
return grp_info[indexv][indexh];
|
|
}
|
|
|
|
/*
|
|
* Reading s_groups_count requires using smp_rmb() afterwards. See
|
|
* the locking protocol documented in the comments of ext4_group_add()
|
|
* in resize.c
|
|
*/
|
|
static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
|
|
{
|
|
ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
|
|
|
|
smp_rmb();
|
|
return ngroups;
|
|
}
|
|
|
|
static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
|
|
ext4_group_t block_group)
|
|
{
|
|
return block_group >> sbi->s_log_groups_per_flex;
|
|
}
|
|
|
|
static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
|
|
{
|
|
return 1 << sbi->s_log_groups_per_flex;
|
|
}
|
|
|
|
#define ext4_std_error(sb, errno) \
|
|
do { \
|
|
if ((errno)) \
|
|
__ext4_std_error((sb), __func__, __LINE__, (errno)); \
|
|
} while (0)
|
|
|
|
#ifdef CONFIG_SMP
|
|
/* Each CPU can accumulate percpu_counter_batch blocks in their local
|
|
* counters. So we need to make sure we have free blocks more
|
|
* than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
|
|
*/
|
|
#define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
|
|
#else
|
|
#define EXT4_FREEBLOCKS_WATERMARK 0
|
|
#endif
|
|
|
|
static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
|
|
{
|
|
/*
|
|
* XXX: replace with spinlock if seen contended -bzzz
|
|
*/
|
|
down_write(&EXT4_I(inode)->i_data_sem);
|
|
if (newsize > EXT4_I(inode)->i_disksize)
|
|
EXT4_I(inode)->i_disksize = newsize;
|
|
up_write(&EXT4_I(inode)->i_data_sem);
|
|
return ;
|
|
}
|
|
|
|
struct ext4_group_info {
|
|
unsigned long bb_state;
|
|
struct rb_root bb_free_root;
|
|
ext4_grpblk_t bb_first_free; /* first free block */
|
|
ext4_grpblk_t bb_free; /* total free blocks */
|
|
ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
|
|
ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
|
|
struct list_head bb_prealloc_list;
|
|
#ifdef DOUBLE_CHECK
|
|
void *bb_bitmap;
|
|
#endif
|
|
struct rw_semaphore alloc_sem;
|
|
ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
|
|
* regions, index is order.
|
|
* bb_counters[3] = 5 means
|
|
* 5 free 8-block regions. */
|
|
};
|
|
|
|
#define EXT4_GROUP_INFO_NEED_INIT_BIT 0
|
|
|
|
#define EXT4_MB_GRP_NEED_INIT(grp) \
|
|
(test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
|
|
|
|
#define EXT4_MAX_CONTENTION 8
|
|
#define EXT4_CONTENTION_THRESHOLD 2
|
|
|
|
static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
|
|
ext4_group_t group)
|
|
{
|
|
return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
|
|
}
|
|
|
|
/*
|
|
* Returns true if the filesystem is busy enough that attempts to
|
|
* access the block group locks has run into contention.
|
|
*/
|
|
static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
|
|
{
|
|
return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
|
|
}
|
|
|
|
static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
|
|
{
|
|
spinlock_t *lock = ext4_group_lock_ptr(sb, group);
|
|
if (spin_trylock(lock))
|
|
/*
|
|
* We're able to grab the lock right away, so drop the
|
|
* lock contention counter.
|
|
*/
|
|
atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
|
|
else {
|
|
/*
|
|
* The lock is busy, so bump the contention counter,
|
|
* and then wait on the spin lock.
|
|
*/
|
|
atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
|
|
EXT4_MAX_CONTENTION);
|
|
spin_lock(lock);
|
|
}
|
|
}
|
|
|
|
static inline void ext4_unlock_group(struct super_block *sb,
|
|
ext4_group_t group)
|
|
{
|
|
spin_unlock(ext4_group_lock_ptr(sb, group));
|
|
}
|
|
|
|
static inline void ext4_mark_super_dirty(struct super_block *sb)
|
|
{
|
|
if (EXT4_SB(sb)->s_journal == NULL)
|
|
sb->s_dirt =1;
|
|
}
|
|
|
|
/*
|
|
* Inodes and files operations
|
|
*/
|
|
|
|
/* dir.c */
|
|
extern const struct file_operations ext4_dir_operations;
|
|
|
|
/* file.c */
|
|
extern const struct inode_operations ext4_file_inode_operations;
|
|
extern const struct file_operations ext4_file_operations;
|
|
extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
|
|
|
|
/* namei.c */
|
|
extern const struct inode_operations ext4_dir_inode_operations;
|
|
extern const struct inode_operations ext4_special_inode_operations;
|
|
extern struct dentry *ext4_get_parent(struct dentry *child);
|
|
|
|
/* symlink.c */
|
|
extern const struct inode_operations ext4_symlink_inode_operations;
|
|
extern const struct inode_operations ext4_fast_symlink_inode_operations;
|
|
|
|
/* block_validity */
|
|
extern void ext4_release_system_zone(struct super_block *sb);
|
|
extern int ext4_setup_system_zone(struct super_block *sb);
|
|
extern int __init ext4_init_system_zone(void);
|
|
extern void ext4_exit_system_zone(void);
|
|
extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
|
|
ext4_fsblk_t start_blk,
|
|
unsigned int count);
|
|
|
|
/* extents.c */
|
|
extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
|
|
extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
|
|
extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
|
|
int chunk);
|
|
extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
|
|
struct ext4_map_blocks *map, int flags);
|
|
extern void ext4_ext_truncate(struct inode *);
|
|
extern void ext4_ext_init(struct super_block *);
|
|
extern void ext4_ext_release(struct super_block *);
|
|
extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
|
|
loff_t len);
|
|
extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
|
|
ssize_t len);
|
|
extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
|
|
struct ext4_map_blocks *map, int flags);
|
|
extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
|
|
__u64 start, __u64 len);
|
|
/* move_extent.c */
|
|
extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
|
|
__u64 start_orig, __u64 start_donor,
|
|
__u64 len, __u64 *moved_len);
|
|
|
|
/* page-io.c */
|
|
extern int __init ext4_init_pageio(void);
|
|
extern void ext4_exit_pageio(void);
|
|
extern void ext4_ioend_wait(struct inode *);
|
|
extern void ext4_free_io_end(ext4_io_end_t *io);
|
|
extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
|
|
extern int ext4_end_io_nolock(ext4_io_end_t *io);
|
|
extern void ext4_io_submit(struct ext4_io_submit *io);
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extern int ext4_bio_write_page(struct ext4_io_submit *io,
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struct page *page,
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int len,
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struct writeback_control *wbc);
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|
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/* BH_Uninit flag: blocks are allocated but uninitialized on disk */
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enum ext4_state_bits {
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BH_Uninit /* blocks are allocated but uninitialized on disk */
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= BH_JBDPrivateStart,
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};
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BUFFER_FNS(Uninit, uninit)
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TAS_BUFFER_FNS(Uninit, uninit)
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|
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/*
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* Add new method to test wether block and inode bitmaps are properly
|
|
* initialized. With uninit_bg reading the block from disk is not enough
|
|
* to mark the bitmap uptodate. We need to also zero-out the bitmap
|
|
*/
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#define BH_BITMAP_UPTODATE BH_JBDPrivateStart
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|
|
|
static inline int bitmap_uptodate(struct buffer_head *bh)
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|
{
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|
return (buffer_uptodate(bh) &&
|
|
test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
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}
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static inline void set_bitmap_uptodate(struct buffer_head *bh)
|
|
{
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|
set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
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|
}
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|
|
|
#define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
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|
|
|
/* For ioend & aio unwritten conversion wait queues */
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|
#define EXT4_WQ_HASH_SZ 37
|
|
#define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
|
|
EXT4_WQ_HASH_SZ])
|
|
#define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\
|
|
EXT4_WQ_HASH_SZ])
|
|
extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
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|
extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
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|
|
|
#endif /* __KERNEL__ */
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|
|
|
#endif /* _EXT4_H */
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