| /* |
| * ext4.h |
| * |
| * Copyright (C) 1992, 1993, 1994, 1995 |
| * Remy Card (card@masi.ibp.fr) |
| * Laboratoire MASI - Institut Blaise Pascal |
| * Universite Pierre et Marie Curie (Paris VI) |
| * |
| * from |
| * |
| * linux/include/linux/minix_fs.h |
| * |
| * Copyright (C) 1991, 1992 Linus Torvalds |
| */ |
| |
| #ifndef _EXT4_H |
| #define _EXT4_H |
| |
| #include <linux/types.h> |
| #include <linux/blkdev.h> |
| #include <linux/magic.h> |
| #include <linux/jbd2.h> |
| #include <linux/quota.h> |
| #include "ext4_i.h" |
| |
| /* |
| * The fourth extended filesystem constants/structures |
| */ |
| |
| /* |
| * Define EXT4FS_DEBUG to produce debug messages |
| */ |
| #undef EXT4FS_DEBUG |
| |
| /* |
| * Debug code |
| */ |
| #ifdef EXT4FS_DEBUG |
| #define ext4_debug(f, a...) \ |
| do { \ |
| printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \ |
| __FILE__, __LINE__, __func__); \ |
| printk(KERN_DEBUG f, ## a); \ |
| } while (0) |
| #else |
| #define ext4_debug(f, a...) do {} while (0) |
| #endif |
| |
| /* prefer goal again. length */ |
| #define EXT4_MB_HINT_MERGE 1 |
| /* blocks already reserved */ |
| #define EXT4_MB_HINT_RESERVED 2 |
| /* metadata is being allocated */ |
| #define EXT4_MB_HINT_METADATA 4 |
| /* first blocks in the file */ |
| #define EXT4_MB_HINT_FIRST 8 |
| /* search for the best chunk */ |
| #define EXT4_MB_HINT_BEST 16 |
| /* data is being allocated */ |
| #define EXT4_MB_HINT_DATA 32 |
| /* don't preallocate (for tails) */ |
| #define EXT4_MB_HINT_NOPREALLOC 64 |
| /* allocate for locality group */ |
| #define EXT4_MB_HINT_GROUP_ALLOC 128 |
| /* allocate goal blocks or none */ |
| #define EXT4_MB_HINT_GOAL_ONLY 256 |
| /* goal is meaningful */ |
| #define EXT4_MB_HINT_TRY_GOAL 512 |
| /* blocks already pre-reserved by delayed allocation */ |
| #define EXT4_MB_DELALLOC_RESERVED 1024 |
| |
| |
| struct ext4_allocation_request { |
| /* target inode for block we're allocating */ |
| struct inode *inode; |
| /* logical block in target inode */ |
| ext4_lblk_t logical; |
| /* phys. target (a hint) */ |
| ext4_fsblk_t goal; |
| /* the closest logical allocated block to the left */ |
| ext4_lblk_t lleft; |
| /* phys. block for ^^^ */ |
| ext4_fsblk_t pleft; |
| /* the closest logical allocated block to the right */ |
| ext4_lblk_t lright; |
| /* phys. block for ^^^ */ |
| ext4_fsblk_t pright; |
| /* how many blocks we want to allocate */ |
| unsigned int len; |
| /* flags. see above EXT4_MB_HINT_* */ |
| unsigned int flags; |
| }; |
| |
| /* |
| * Special inodes numbers |
| */ |
| #define EXT4_BAD_INO 1 /* Bad blocks inode */ |
| #define EXT4_ROOT_INO 2 /* Root inode */ |
| #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */ |
| #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */ |
| #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */ |
| #define EXT4_JOURNAL_INO 8 /* Journal inode */ |
| |
| /* First non-reserved inode for old ext4 filesystems */ |
| #define EXT4_GOOD_OLD_FIRST_INO 11 |
| |
| /* |
| * Maximal count of links to a file |
| */ |
| #define EXT4_LINK_MAX 65000 |
| |
| /* |
| * Macro-instructions used to manage several block sizes |
| */ |
| #define EXT4_MIN_BLOCK_SIZE 1024 |
| #define EXT4_MAX_BLOCK_SIZE 65536 |
| #define EXT4_MIN_BLOCK_LOG_SIZE 10 |
| #ifdef __KERNEL__ |
| # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize) |
| #else |
| # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size) |
| #endif |
| #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32)) |
| #ifdef __KERNEL__ |
| # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) |
| #else |
| # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) |
| #endif |
| #ifdef __KERNEL__ |
| #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits) |
| #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size) |
| #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino) |
| #else |
| #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ |
| EXT4_GOOD_OLD_INODE_SIZE : \ |
| (s)->s_inode_size) |
| #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \ |
| EXT4_GOOD_OLD_FIRST_INO : \ |
| (s)->s_first_ino) |
| #endif |
| #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits))) |
| |
| /* |
| * Structure of a blocks group descriptor |
| */ |
| struct ext4_group_desc |
| { |
| __le32 bg_block_bitmap_lo; /* Blocks bitmap block */ |
| __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */ |
| __le32 bg_inode_table_lo; /* Inodes table block */ |
| __le16 bg_free_blocks_count_lo;/* Free blocks count */ |
| __le16 bg_free_inodes_count_lo;/* Free inodes count */ |
| __le16 bg_used_dirs_count_lo; /* Directories count */ |
| __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */ |
| __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */ |
| __le16 bg_itable_unused_lo; /* Unused inodes count */ |
| __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ |
| __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */ |
| __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */ |
| __le32 bg_inode_table_hi; /* Inodes table block MSB */ |
| __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */ |
| __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */ |
| __le16 bg_used_dirs_count_hi; /* Directories count MSB */ |
| __le16 bg_itable_unused_hi; /* Unused inodes count MSB */ |
| __u32 bg_reserved2[3]; |
| }; |
| |
| /* |
| * Structure of a flex block group info |
| */ |
| |
| struct flex_groups { |
| atomic_t free_inodes; |
| atomic_t free_blocks; |
| atomic_t used_dirs; |
| }; |
| |
| #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */ |
| #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */ |
| #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */ |
| |
| #ifdef __KERNEL__ |
| #include "ext4_sb.h" |
| #endif |
| /* |
| * Macro-instructions used to manage group descriptors |
| */ |
| #define EXT4_MIN_DESC_SIZE 32 |
| #define EXT4_MIN_DESC_SIZE_64BIT 64 |
| #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE |
| #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size) |
| #ifdef __KERNEL__ |
| # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group) |
| # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block) |
| # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group) |
| # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits) |
| #else |
| # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) |
| # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s)) |
| # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) |
| #endif |
| |
| /* |
| * Constants relative to the data blocks |
| */ |
| #define EXT4_NDIR_BLOCKS 12 |
| #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS |
| #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1) |
| #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1) |
| #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1) |
| |
| /* |
| * Inode flags |
| */ |
| #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */ |
| #define EXT4_UNRM_FL 0x00000002 /* Undelete */ |
| #define EXT4_COMPR_FL 0x00000004 /* Compress file */ |
| #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */ |
| #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */ |
| #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */ |
| #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */ |
| #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */ |
| /* Reserved for compression usage... */ |
| #define EXT4_DIRTY_FL 0x00000100 |
| #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ |
| #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */ |
| #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */ |
| /* End compression flags --- maybe not all used */ |
| #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */ |
| #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */ |
| #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ |
| #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */ |
| #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ |
| #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ |
| #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */ |
| #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ |
| #define EXT4_EXT_MIGRATE 0x00100000 /* Inode is migrating */ |
| #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */ |
| |
| #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */ |
| #define EXT4_FL_USER_MODIFIABLE 0x000B80FF /* User modifiable flags */ |
| |
| /* Flags that should be inherited by new inodes from their parent. */ |
| #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\ |
| EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\ |
| EXT4_NODUMP_FL | EXT4_NOATIME_FL |\ |
| EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\ |
| EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL) |
| |
| /* Flags that are appropriate for regular files (all but dir-specific ones). */ |
| #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL)) |
| |
| /* Flags that are appropriate for non-directories/regular files. */ |
| #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL) |
| |
| /* Mask out flags that are inappropriate for the given type of inode. */ |
| static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags) |
| { |
| if (S_ISDIR(mode)) |
| return flags; |
| else if (S_ISREG(mode)) |
| return flags & EXT4_REG_FLMASK; |
| else |
| return flags & EXT4_OTHER_FLMASK; |
| } |
| |
| /* |
| * Inode dynamic state flags |
| */ |
| #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */ |
| #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */ |
| #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */ |
| #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */ |
| #define EXT4_STATE_DA_ALLOC_CLOSE 0x00000010 /* Alloc DA blks on close */ |
| |
| /* 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; |
| }; |
| |
| /* 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; |
| }; |
| |
| /* |
| * Following is used by preallocation code to tell get_blocks() that we |
| * want uninitialzed extents. |
| */ |
| #define EXT4_CREATE_UNINITIALIZED_EXT 2 |
| |
| /* |
| * 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) |
| |
| /* |
| * 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) |
| #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 |
| |
| |
| /* |
| * Mount options |
| */ |
| struct ext4_mount_options { |
| unsigned long s_mount_opt; |
| uid_t s_resuid; |
| gid_t s_resgid; |
| unsigned long s_commit_interval; |
| u32 s_min_batch_time, s_max_batch_time; |
| #ifdef CONFIG_QUOTA |
| int s_jquota_fmt; |
| char *s_qf_names[MAXQUOTAS]; |
| #endif |
| }; |
| |
| /* |
| * 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 */ |
| }; |
| |
| |
| #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 : 0) | |
| ((time->tv_nsec << 2) & 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) >> 2; |
| } |
| |
| #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); \ |
| } 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); \ |
| } 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__) */ |
| |
| /* |
| * 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_ABORT 0x00200 /* Fatal error detected */ |
| #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_NOBH 0x40000 /* No bufferheads */ |
| #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_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_DELALLOC 0x8000000 /* Delalloc support */ |
| #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */ |
| |
| /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */ |
| #ifndef _LINUX_EXT2_FS_H |
| #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt |
| #define set_opt(o, opt) o |= EXT4_MOUNT_##opt |
| #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \ |
| EXT4_MOUNT_##opt) |
| #else |
| #define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD |
| #define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT |
| #define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS |
| #endif |
| |
| #define ext4_set_bit ext2_set_bit |
| #define ext4_set_bit_atomic ext2_set_bit_atomic |
| #define ext4_clear_bit ext2_clear_bit |
| #define ext4_clear_bit_atomic ext2_clear_bit_atomic |
| #define ext4_test_bit ext2_test_bit |
| #define ext4_find_first_zero_bit ext2_find_first_zero_bit |
| #define ext4_find_next_zero_bit ext2_find_next_zero_bit |
| #define ext4_find_next_bit ext2_find_next_bit |
| |
| /* |
| * 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_reserved_char_pad; |
| __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_pad2; |
| __le16 s_reserved_pad; |
| __le64 s_kbytes_written; /* nr of lifetime kilobytes written */ |
| __u32 s_reserved[160]; /* Padding to the end of the block */ |
| }; |
| |
| #ifdef __KERNEL__ |
| 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)); |
| } |
| #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_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 |
| |
| /* |
| * 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) |
| |
| /* |
| * 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_I(dir)->i_flags & EXT4_INDEX_FL)) |
| #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); |
| |
| extern struct proc_dir_entry *ext4_proc_root; |
| |
| /* |
| * 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 int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks); |
| extern void ext4_free_blocks(handle_t *handle, struct inode *inode, |
| ext4_fsblk_t block, unsigned long count, int metadata); |
| 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); |
| |
| /* dir.c */ |
| extern int ext4_check_dir_entry(const char *, struct inode *, |
| struct ext4_dir_entry_2 *, |
| struct buffer_head *, unsigned int); |
| 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 *, struct dentry *, int); |
| |
| /* 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); |
| 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 *); |
| |
| /* 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 init_ext4_mballoc(void); |
| extern void exit_ext4_mballoc(void); |
| extern void ext4_mb_free_blocks(handle_t *, struct inode *, |
| unsigned long, unsigned long, int, unsigned long *); |
| extern int ext4_mb_add_groupinfo(struct super_block *sb, |
| ext4_group_t i, struct ext4_group_desc *desc); |
| extern void ext4_mb_update_group_info(struct ext4_group_info *grp, |
| ext4_grpblk_t add); |
| extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t); |
| extern void ext4_mb_put_buddy_cache_lock(struct super_block *, |
| ext4_group_t, int); |
| /* inode.c */ |
| int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode, |
| struct buffer_head *bh, ext4_fsblk_t blocknr); |
| 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 *, int); |
| extern int ext4_setattr(struct dentry *, struct iattr *); |
| extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry, |
| struct kstat *stat); |
| extern void ext4_delete_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 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_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks); |
| 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 page *page); |
| extern qsize_t ext4_get_reserved_space(struct inode *inode); |
| |
| /* 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 unsigned int ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize); |
| extern __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize); |
| 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 *, const char *, ...) |
| __attribute__ ((format (printf, 3, 4))); |
| extern void __ext4_std_error(struct super_block *, const char *, int); |
| extern void ext4_abort(struct super_block *, const char *, const char *, ...) |
| __attribute__ ((format (printf, 3, 4))); |
| extern void ext4_warning(struct super_block *, const char *, const char *, ...) |
| __attribute__ ((format (printf, 3, 4))); |
| extern void ext4_grp_locked_error(struct super_block *, ext4_group_t, |
| const char *, const char *, ...) |
| __attribute__ ((format (printf, 4, 5))); |
| 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); |
| |
| 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]; |
| } |
| |
| |
| 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__, (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; |
| unsigned short bb_first_free; |
| unsigned short bb_free; |
| unsigned short bb_fragments; |
| struct list_head bb_prealloc_list; |
| #ifdef DOUBLE_CHECK |
| void *bb_bitmap; |
| #endif |
| struct rw_semaphore alloc_sem; |
| unsigned short bb_counters[]; |
| }; |
| |
| #define EXT4_GROUP_INFO_NEED_INIT_BIT 0 |
| #define EXT4_GROUP_INFO_LOCKED_BIT 1 |
| |
| #define EXT4_MB_GRP_NEED_INIT(grp) \ |
| (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state))) |
| |
| static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group) |
| { |
| struct ext4_group_info *grinfo = ext4_get_group_info(sb, group); |
| |
| bit_spin_lock(EXT4_GROUP_INFO_LOCKED_BIT, &(grinfo->bb_state)); |
| } |
| |
| static inline void ext4_unlock_group(struct super_block *sb, |
| ext4_group_t group) |
| { |
| struct ext4_group_info *grinfo = ext4_get_group_info(sb, group); |
| |
| bit_spin_unlock(EXT4_GROUP_INFO_LOCKED_BIT, &(grinfo->bb_state)); |
| } |
| |
| static inline int ext4_is_group_locked(struct super_block *sb, |
| ext4_group_t group) |
| { |
| struct ext4_group_info *grinfo = ext4_get_group_info(sb, group); |
| |
| return bit_spin_is_locked(EXT4_GROUP_INFO_LOCKED_BIT, |
| &(grinfo->bb_state)); |
| } |
| |
| /* |
| * 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; |
| |
| /* namei.c */ |
| extern const struct inode_operations ext4_dir_inode_operations; |
| extern const struct inode_operations ext4_special_inode_operations; |
| |
| /* symlink.c */ |
| extern const struct inode_operations ext4_symlink_inode_operations; |
| extern const struct inode_operations ext4_fast_symlink_inode_operations; |
| |
| /* 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_get_blocks(handle_t *handle, struct inode *inode, |
| ext4_lblk_t iblock, unsigned int max_blocks, |
| struct buffer_head *bh_result, |
| int create, int extend_disksize); |
| 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 inode *inode, int mode, loff_t offset, |
| loff_t len); |
| extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, |
| sector_t block, unsigned int max_blocks, |
| struct buffer_head *bh, int create, |
| int extend_disksize, int flag); |
| extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
| __u64 start, __u64 len); |
| |
| /* |
| * 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 |
| */ |
| #define BH_BITMAP_UPTODATE BH_JBDPrivateStart |
| |
| static inline int bitmap_uptodate(struct buffer_head *bh) |
| { |
| return (buffer_uptodate(bh) && |
| test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state)); |
| } |
| static inline void set_bitmap_uptodate(struct buffer_head *bh) |
| { |
| set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state); |
| } |
| |
| #endif /* __KERNEL__ */ |
| |
| #endif /* _EXT4_H */ |