f51667685749e fs/ext4/ext4_extents.h (Theodore Ts'o 2017-12-17 22:00:59 -0500 1) // SPDX-License-Identifier: GPL-2.0
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 2) /*
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 3) * Copyright (c) 2003-2006, Cluster File Systems, Inc, info@clusterfs.com
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 4) * Written by Alex Tomas <alex@clusterfs.com>
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 5) */
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 6)
3dcf54515aa49 fs/ext4/ext4_extents.h (Christoph Hellwig 2008-04-29 18:13:32 -0400 7) #ifndef _EXT4_EXTENTS
3dcf54515aa49 fs/ext4/ext4_extents.h (Christoph Hellwig 2008-04-29 18:13:32 -0400 8) #define _EXT4_EXTENTS
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 9)
3dcf54515aa49 fs/ext4/ext4_extents.h (Christoph Hellwig 2008-04-29 18:13:32 -0400 10) #include "ext4.h"
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 11)
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 12) /*
bbf2f9fb1c723 include/linux/ext4_fs_extents.h (Robert P. J. Day 2007-02-17 19:20:16 +0100 13) * With AGGRESSIVE_TEST defined, the capacity of index/leaf blocks
d0d856e8bd6e6 include/linux/ext4_fs_extents.h (Randy Dunlap 2006-10-11 01:21:07 -0700 14) * becomes very small, so index split, in-depth growing and
d0d856e8bd6e6 include/linux/ext4_fs_extents.h (Randy Dunlap 2006-10-11 01:21:07 -0700 15) * other hard changes happen much more often.
d0d856e8bd6e6 include/linux/ext4_fs_extents.h (Randy Dunlap 2006-10-11 01:21:07 -0700 16) * This is for debug purposes only.
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 17) */
bbf2f9fb1c723 include/linux/ext4_fs_extents.h (Robert P. J. Day 2007-02-17 19:20:16 +0100 18) #define AGGRESSIVE_TEST_
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 19)
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 20) /*
d0d856e8bd6e6 include/linux/ext4_fs_extents.h (Randy Dunlap 2006-10-11 01:21:07 -0700 21) * With EXTENTS_STATS defined, the number of blocks and extents
d0d856e8bd6e6 include/linux/ext4_fs_extents.h (Randy Dunlap 2006-10-11 01:21:07 -0700 22) * are collected in the truncate path. They'll be shown at
d0d856e8bd6e6 include/linux/ext4_fs_extents.h (Randy Dunlap 2006-10-11 01:21:07 -0700 23) * umount time.
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 24) */
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 25) #define EXTENTS_STATS__
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 26)
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 27) /*
d0d856e8bd6e6 include/linux/ext4_fs_extents.h (Randy Dunlap 2006-10-11 01:21:07 -0700 28) * If CHECK_BINSEARCH is defined, then the results of the binary search
d0d856e8bd6e6 include/linux/ext4_fs_extents.h (Randy Dunlap 2006-10-11 01:21:07 -0700 29) * will also be checked by linear search.
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 30) */
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 31) #define CHECK_BINSEARCH__
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 32)
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 33) /*
d0d856e8bd6e6 include/linux/ext4_fs_extents.h (Randy Dunlap 2006-10-11 01:21:07 -0700 34) * If EXT_STATS is defined then stats numbers are collected.
d0d856e8bd6e6 include/linux/ext4_fs_extents.h (Randy Dunlap 2006-10-11 01:21:07 -0700 35) * These number will be displayed at umount time.
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 36) */
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 37) #define EXT_STATS_
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 38)
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 39)
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 40) /*
d0d856e8bd6e6 include/linux/ext4_fs_extents.h (Randy Dunlap 2006-10-11 01:21:07 -0700 41) * ext4_inode has i_block array (60 bytes total).
d0d856e8bd6e6 include/linux/ext4_fs_extents.h (Randy Dunlap 2006-10-11 01:21:07 -0700 42) * The first 12 bytes store ext4_extent_header;
d0d856e8bd6e6 include/linux/ext4_fs_extents.h (Randy Dunlap 2006-10-11 01:21:07 -0700 43) * the remainder stores an array of ext4_extent.
e615391896064 fs/ext4/ext4_extents.h (Darrick J. Wong 2012-04-29 18:23:10 -0400 44) * For non-inode extent blocks, ext4_extent_tail
e615391896064 fs/ext4/ext4_extents.h (Darrick J. Wong 2012-04-29 18:23:10 -0400 45) * follows the array.
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 46) */
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 47)
e615391896064 fs/ext4/ext4_extents.h (Darrick J. Wong 2012-04-29 18:23:10 -0400 48) /*
e615391896064 fs/ext4/ext4_extents.h (Darrick J. Wong 2012-04-29 18:23:10 -0400 49) * This is the extent tail on-disk structure.
e615391896064 fs/ext4/ext4_extents.h (Darrick J. Wong 2012-04-29 18:23:10 -0400 50) * All other extent structures are 12 bytes long. It turns out that
e615391896064 fs/ext4/ext4_extents.h (Darrick J. Wong 2012-04-29 18:23:10 -0400 51) * block_size % 12 >= 4 for at least all powers of 2 greater than 512, which
e615391896064 fs/ext4/ext4_extents.h (Darrick J. Wong 2012-04-29 18:23:10 -0400 52) * covers all valid ext4 block sizes. Therefore, this tail structure can be
e615391896064 fs/ext4/ext4_extents.h (Darrick J. Wong 2012-04-29 18:23:10 -0400 53) * crammed into the end of the block without having to rebalance the tree.
e615391896064 fs/ext4/ext4_extents.h (Darrick J. Wong 2012-04-29 18:23:10 -0400 54) */
e615391896064 fs/ext4/ext4_extents.h (Darrick J. Wong 2012-04-29 18:23:10 -0400 55) struct ext4_extent_tail {
e615391896064 fs/ext4/ext4_extents.h (Darrick J. Wong 2012-04-29 18:23:10 -0400 56) __le32 et_checksum; /* crc32c(uuid+inum+extent_block) */
e615391896064 fs/ext4/ext4_extents.h (Darrick J. Wong 2012-04-29 18:23:10 -0400 57) };
e615391896064 fs/ext4/ext4_extents.h (Darrick J. Wong 2012-04-29 18:23:10 -0400 58)
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 59) /*
d0d856e8bd6e6 include/linux/ext4_fs_extents.h (Randy Dunlap 2006-10-11 01:21:07 -0700 60) * This is the extent on-disk structure.
d0d856e8bd6e6 include/linux/ext4_fs_extents.h (Randy Dunlap 2006-10-11 01:21:07 -0700 61) * It's used at the bottom of the tree.
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 62) */
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 63) struct ext4_extent {
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 64) __le32 ee_block; /* first logical block extent covers */
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 65) __le16 ee_len; /* number of blocks covered by extent */
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 66) __le16 ee_start_hi; /* high 16 bits of physical block */
b377611d11aba include/linux/ext4_fs_extents.h (Aneesh Kumar K.V 2007-10-16 18:38:25 -0400 67) __le32 ee_start_lo; /* low 32 bits of physical block */
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 68) };
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 69)
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 70) /*
d0d856e8bd6e6 include/linux/ext4_fs_extents.h (Randy Dunlap 2006-10-11 01:21:07 -0700 71) * This is index on-disk structure.
d0d856e8bd6e6 include/linux/ext4_fs_extents.h (Randy Dunlap 2006-10-11 01:21:07 -0700 72) * It's used at all the levels except the bottom.
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 73) */
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 74) struct ext4_extent_idx {
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 75) __le32 ei_block; /* index covers logical blocks from 'block' */
d8dd0b45438d6 include/linux/ext4_fs_extents.h (Aneesh Kumar K.V 2007-10-16 18:38:25 -0400 76) __le32 ei_leaf_lo; /* pointer to the physical block of the next *
d0d856e8bd6e6 include/linux/ext4_fs_extents.h (Randy Dunlap 2006-10-11 01:21:07 -0700 77) * level. leaf or next index could be there */
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 78) __le16 ei_leaf_hi; /* high 16 bits of physical block */
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 79) __u16 ei_unused;
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 80) };
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 81)
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 82) /*
d0d856e8bd6e6 include/linux/ext4_fs_extents.h (Randy Dunlap 2006-10-11 01:21:07 -0700 83) * Each block (leaves and indexes), even inode-stored has header.
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 84) */
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 85) struct ext4_extent_header {
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 86) __le16 eh_magic; /* probably will support different formats */
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 87) __le16 eh_entries; /* number of valid entries */
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 88) __le16 eh_max; /* capacity of store in entries */
d0d856e8bd6e6 include/linux/ext4_fs_extents.h (Randy Dunlap 2006-10-11 01:21:07 -0700 89) __le16 eh_depth; /* has tree real underlying blocks? */
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 90) __le32 eh_generation; /* generation of the tree */
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 91) };
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 92)
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 93) #define EXT4_EXT_MAGIC cpu_to_le16(0xf30a)
bc890a6024717 fs/ext4/ext4_extents.h (Theodore Ts'o 2018-06-14 12:55:10 -0400 94) #define EXT4_MAX_EXTENT_DEPTH 5
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 95)
7ac5990d5a3e2 fs/ext4/ext4_extents.h (Darrick J. Wong 2012-04-29 18:37:10 -0400 96) #define EXT4_EXTENT_TAIL_OFFSET(hdr) \
7ac5990d5a3e2 fs/ext4/ext4_extents.h (Darrick J. Wong 2012-04-29 18:37:10 -0400 97) (sizeof(struct ext4_extent_header) + \
7ac5990d5a3e2 fs/ext4/ext4_extents.h (Darrick J. Wong 2012-04-29 18:37:10 -0400 98) (sizeof(struct ext4_extent) * le16_to_cpu((hdr)->eh_max)))
7ac5990d5a3e2 fs/ext4/ext4_extents.h (Darrick J. Wong 2012-04-29 18:37:10 -0400 99)
7ac5990d5a3e2 fs/ext4/ext4_extents.h (Darrick J. Wong 2012-04-29 18:37:10 -0400 100) static inline struct ext4_extent_tail *
7ac5990d5a3e2 fs/ext4/ext4_extents.h (Darrick J. Wong 2012-04-29 18:37:10 -0400 101) find_ext4_extent_tail(struct ext4_extent_header *eh)
7ac5990d5a3e2 fs/ext4/ext4_extents.h (Darrick J. Wong 2012-04-29 18:37:10 -0400 102) {
7ac5990d5a3e2 fs/ext4/ext4_extents.h (Darrick J. Wong 2012-04-29 18:37:10 -0400 103) return (struct ext4_extent_tail *)(((void *)eh) +
7ac5990d5a3e2 fs/ext4/ext4_extents.h (Darrick J. Wong 2012-04-29 18:37:10 -0400 104) EXT4_EXTENT_TAIL_OFFSET(eh));
7ac5990d5a3e2 fs/ext4/ext4_extents.h (Darrick J. Wong 2012-04-29 18:37:10 -0400 105) }
7ac5990d5a3e2 fs/ext4/ext4_extents.h (Darrick J. Wong 2012-04-29 18:37:10 -0400 106)
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 107) /*
d0d856e8bd6e6 include/linux/ext4_fs_extents.h (Randy Dunlap 2006-10-11 01:21:07 -0700 108) * Array of ext4_ext_path contains path to some extent.
d0d856e8bd6e6 include/linux/ext4_fs_extents.h (Randy Dunlap 2006-10-11 01:21:07 -0700 109) * Creation/lookup routines use it for traversal/splitting/etc.
d0d856e8bd6e6 include/linux/ext4_fs_extents.h (Randy Dunlap 2006-10-11 01:21:07 -0700 110) * Truncate uses it to simulate recursive walking.
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 111) */
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 112) struct ext4_ext_path {
f65e6fba163df include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:05 -0700 113) ext4_fsblk_t p_block;
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 114) __u16 p_depth;
10809df84a4d8 fs/ext4/ext4_extents.h (Theodore Ts'o 2014-09-01 14:40:09 -0400 115) __u16 p_maxdepth;
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 116) struct ext4_extent *p_ext;
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 117) struct ext4_extent_idx *p_idx;
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 118) struct ext4_extent_header *p_hdr;
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 119) struct buffer_head *p_bh;
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 120) };
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 121)
9fe671496b6c2 fs/ext4/ext4_extents.h (Eric Whitney 2018-10-01 14:25:08 -0400 122) /*
9fe671496b6c2 fs/ext4/ext4_extents.h (Eric Whitney 2018-10-01 14:25:08 -0400 123) * Used to record a portion of a cluster found at the beginning or end
9fe671496b6c2 fs/ext4/ext4_extents.h (Eric Whitney 2018-10-01 14:25:08 -0400 124) * of an extent while traversing the extent tree during space removal.
9fe671496b6c2 fs/ext4/ext4_extents.h (Eric Whitney 2018-10-01 14:25:08 -0400 125) * A partial cluster may be removed if it does not contain blocks shared
9fe671496b6c2 fs/ext4/ext4_extents.h (Eric Whitney 2018-10-01 14:25:08 -0400 126) * with extents that aren't being deleted (tofree state). Otherwise,
9fe671496b6c2 fs/ext4/ext4_extents.h (Eric Whitney 2018-10-01 14:25:08 -0400 127) * it cannot be removed (nofree state).
9fe671496b6c2 fs/ext4/ext4_extents.h (Eric Whitney 2018-10-01 14:25:08 -0400 128) */
9fe671496b6c2 fs/ext4/ext4_extents.h (Eric Whitney 2018-10-01 14:25:08 -0400 129) struct partial_cluster {
9fe671496b6c2 fs/ext4/ext4_extents.h (Eric Whitney 2018-10-01 14:25:08 -0400 130) ext4_fsblk_t pclu; /* physical cluster number */
9fe671496b6c2 fs/ext4/ext4_extents.h (Eric Whitney 2018-10-01 14:25:08 -0400 131) ext4_lblk_t lblk; /* logical block number within logical cluster */
9fe671496b6c2 fs/ext4/ext4_extents.h (Eric Whitney 2018-10-01 14:25:08 -0400 132) enum {initial, tofree, nofree} state;
9fe671496b6c2 fs/ext4/ext4_extents.h (Eric Whitney 2018-10-01 14:25:08 -0400 133) };
9fe671496b6c2 fs/ext4/ext4_extents.h (Eric Whitney 2018-10-01 14:25:08 -0400 134)
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 135) /*
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 136) * structure for external API
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 137) */
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 138)
749269facaf87 include/linux/ext4_fs_extents.h (Amit Arora 2007-07-18 09:02:56 -0400 139) /*
749269facaf87 include/linux/ext4_fs_extents.h (Amit Arora 2007-07-18 09:02:56 -0400 140) * EXT_INIT_MAX_LEN is the maximum number of blocks we can have in an
749269facaf87 include/linux/ext4_fs_extents.h (Amit Arora 2007-07-18 09:02:56 -0400 141) * initialized extent. This is 2^15 and not (2^16 - 1), since we use the
749269facaf87 include/linux/ext4_fs_extents.h (Amit Arora 2007-07-18 09:02:56 -0400 142) * MSB of ee_len field in the extent datastructure to signify if this
556615dcbf38b fs/ext4/ext4_extents.h (Lukas Czerner 2014-04-20 23:45:47 -0400 143) * particular extent is an initialized extent or an unwritten (i.e.
749269facaf87 include/linux/ext4_fs_extents.h (Amit Arora 2007-07-18 09:02:56 -0400 144) * preallocated).
556615dcbf38b fs/ext4/ext4_extents.h (Lukas Czerner 2014-04-20 23:45:47 -0400 145) * EXT_UNWRITTEN_MAX_LEN is the maximum number of blocks we can have in an
556615dcbf38b fs/ext4/ext4_extents.h (Lukas Czerner 2014-04-20 23:45:47 -0400 146) * unwritten extent.
749269facaf87 include/linux/ext4_fs_extents.h (Amit Arora 2007-07-18 09:02:56 -0400 147) * If ee_len is <= 0x8000, it is an initialized extent. Otherwise, it is an
556615dcbf38b fs/ext4/ext4_extents.h (Lukas Czerner 2014-04-20 23:45:47 -0400 148) * unwritten one. In other words, if MSB of ee_len is set, it is an
556615dcbf38b fs/ext4/ext4_extents.h (Lukas Czerner 2014-04-20 23:45:47 -0400 149) * unwritten extent with only one special scenario when ee_len = 0x8000.
556615dcbf38b fs/ext4/ext4_extents.h (Lukas Czerner 2014-04-20 23:45:47 -0400 150) * In this case we can not have an unwritten extent of zero length and
749269facaf87 include/linux/ext4_fs_extents.h (Amit Arora 2007-07-18 09:02:56 -0400 151) * thus we make it as a special case of initialized extent with 0x8000 length.
749269facaf87 include/linux/ext4_fs_extents.h (Amit Arora 2007-07-18 09:02:56 -0400 152) * This way we get better extent-to-group alignment for initialized extents.
749269facaf87 include/linux/ext4_fs_extents.h (Amit Arora 2007-07-18 09:02:56 -0400 153) * Hence, the maximum number of blocks we can have in an *initialized*
556615dcbf38b fs/ext4/ext4_extents.h (Lukas Czerner 2014-04-20 23:45:47 -0400 154) * extent is 2^15 (32768) and in an *unwritten* extent is 2^15-1 (32767).
749269facaf87 include/linux/ext4_fs_extents.h (Amit Arora 2007-07-18 09:02:56 -0400 155) */
749269facaf87 include/linux/ext4_fs_extents.h (Amit Arora 2007-07-18 09:02:56 -0400 156) #define EXT_INIT_MAX_LEN (1UL << 15)
556615dcbf38b fs/ext4/ext4_extents.h (Lukas Czerner 2014-04-20 23:45:47 -0400 157) #define EXT_UNWRITTEN_MAX_LEN (EXT_INIT_MAX_LEN - 1)
471d4011a9862 include/linux/ext4_fs_extents.h (Suparna Bhattacharya 2006-10-11 01:21:06 -0700 158)
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 159)
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 160) #define EXT_FIRST_EXTENT(__hdr__) \
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 161) ((struct ext4_extent *) (((char *) (__hdr__)) + \
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 162) sizeof(struct ext4_extent_header)))
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 163) #define EXT_FIRST_INDEX(__hdr__) \
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 164) ((struct ext4_extent_idx *) (((char *) (__hdr__)) + \
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 165) sizeof(struct ext4_extent_header)))
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 166) #define EXT_HAS_FREE_INDEX(__path__) \
8c55e20411c94 include/linux/ext4_fs_extents.h (Dave Kleikamp 2007-05-24 13:04:54 -0400 167) (le16_to_cpu((__path__)->p_hdr->eh_entries) \
8c55e20411c94 include/linux/ext4_fs_extents.h (Dave Kleikamp 2007-05-24 13:04:54 -0400 168) < le16_to_cpu((__path__)->p_hdr->eh_max))
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 169) #define EXT_LAST_EXTENT(__hdr__) \
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 170) (EXT_FIRST_EXTENT((__hdr__)) + le16_to_cpu((__hdr__)->eh_entries) - 1)
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 171) #define EXT_LAST_INDEX(__hdr__) \
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 172) (EXT_FIRST_INDEX((__hdr__)) + le16_to_cpu((__hdr__)->eh_entries) - 1)
c36a71b4e35ab fs/ext4/ext4_extents.h (Harshad Shirwadkar 2020-04-20 19:39:59 -0700 173) #define EXT_MAX_EXTENT(__hdr__) \
c36a71b4e35ab fs/ext4/ext4_extents.h (Harshad Shirwadkar 2020-04-20 19:39:59 -0700 174) ((le16_to_cpu((__hdr__)->eh_max)) ? \
c36a71b4e35ab fs/ext4/ext4_extents.h (Harshad Shirwadkar 2020-04-20 19:39:59 -0700 175) ((EXT_FIRST_EXTENT((__hdr__)) + le16_to_cpu((__hdr__)->eh_max) - 1)) \
c36a71b4e35ab fs/ext4/ext4_extents.h (Harshad Shirwadkar 2020-04-20 19:39:59 -0700 176) : 0)
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 177) #define EXT_MAX_INDEX(__hdr__) \
c36a71b4e35ab fs/ext4/ext4_extents.h (Harshad Shirwadkar 2020-04-20 19:39:59 -0700 178) ((le16_to_cpu((__hdr__)->eh_max)) ? \
c36a71b4e35ab fs/ext4/ext4_extents.h (Harshad Shirwadkar 2020-04-20 19:39:59 -0700 179) ((EXT_FIRST_INDEX((__hdr__)) + le16_to_cpu((__hdr__)->eh_max) - 1)) : 0)
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 180)
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 181) static inline struct ext4_extent_header *ext_inode_hdr(struct inode *inode)
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 182) {
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 183) return (struct ext4_extent_header *) EXT4_I(inode)->i_data;
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 184) }
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 185)
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 186) static inline struct ext4_extent_header *ext_block_hdr(struct buffer_head *bh)
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 187) {
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 188) return (struct ext4_extent_header *) bh->b_data;
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 189) }
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 190)
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 191) static inline unsigned short ext_depth(struct inode *inode)
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 192) {
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 193) return le16_to_cpu(ext_inode_hdr(inode)->eh_depth);
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 194) }
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 195)
556615dcbf38b fs/ext4/ext4_extents.h (Lukas Czerner 2014-04-20 23:45:47 -0400 196) static inline void ext4_ext_mark_unwritten(struct ext4_extent *ext)
a2df2a6340780 include/linux/ext4_fs_extents.h (Amit Arora 2007-07-17 21:42:41 -0400 197) {
556615dcbf38b fs/ext4/ext4_extents.h (Lukas Czerner 2014-04-20 23:45:47 -0400 198) /* We can not have an unwritten extent of zero length! */
749269facaf87 include/linux/ext4_fs_extents.h (Amit Arora 2007-07-18 09:02:56 -0400 199) BUG_ON((le16_to_cpu(ext->ee_len) & ~EXT_INIT_MAX_LEN) == 0);
749269facaf87 include/linux/ext4_fs_extents.h (Amit Arora 2007-07-18 09:02:56 -0400 200) ext->ee_len |= cpu_to_le16(EXT_INIT_MAX_LEN);
a2df2a6340780 include/linux/ext4_fs_extents.h (Amit Arora 2007-07-17 21:42:41 -0400 201) }
a2df2a6340780 include/linux/ext4_fs_extents.h (Amit Arora 2007-07-17 21:42:41 -0400 202)
556615dcbf38b fs/ext4/ext4_extents.h (Lukas Czerner 2014-04-20 23:45:47 -0400 203) static inline int ext4_ext_is_unwritten(struct ext4_extent *ext)
a2df2a6340780 include/linux/ext4_fs_extents.h (Amit Arora 2007-07-17 21:42:41 -0400 204) {
749269facaf87 include/linux/ext4_fs_extents.h (Amit Arora 2007-07-18 09:02:56 -0400 205) /* Extent with ee_len of 0x8000 is treated as an initialized extent */
749269facaf87 include/linux/ext4_fs_extents.h (Amit Arora 2007-07-18 09:02:56 -0400 206) return (le16_to_cpu(ext->ee_len) > EXT_INIT_MAX_LEN);
a2df2a6340780 include/linux/ext4_fs_extents.h (Amit Arora 2007-07-17 21:42:41 -0400 207) }
a2df2a6340780 include/linux/ext4_fs_extents.h (Amit Arora 2007-07-17 21:42:41 -0400 208)
a2df2a6340780 include/linux/ext4_fs_extents.h (Amit Arora 2007-07-17 21:42:41 -0400 209) static inline int ext4_ext_get_actual_len(struct ext4_extent *ext)
a2df2a6340780 include/linux/ext4_fs_extents.h (Amit Arora 2007-07-17 21:42:41 -0400 210) {
749269facaf87 include/linux/ext4_fs_extents.h (Amit Arora 2007-07-18 09:02:56 -0400 211) return (le16_to_cpu(ext->ee_len) <= EXT_INIT_MAX_LEN ?
749269facaf87 include/linux/ext4_fs_extents.h (Amit Arora 2007-07-18 09:02:56 -0400 212) le16_to_cpu(ext->ee_len) :
749269facaf87 include/linux/ext4_fs_extents.h (Amit Arora 2007-07-18 09:02:56 -0400 213) (le16_to_cpu(ext->ee_len) - EXT_INIT_MAX_LEN));
a2df2a6340780 include/linux/ext4_fs_extents.h (Amit Arora 2007-07-17 21:42:41 -0400 214) }
a2df2a6340780 include/linux/ext4_fs_extents.h (Amit Arora 2007-07-17 21:42:41 -0400 215)
0031462b5b392 fs/ext4/ext4_extents.h (Mingming Cao 2009-09-28 15:49:08 -0400 216) static inline void ext4_ext_mark_initialized(struct ext4_extent *ext)
0031462b5b392 fs/ext4/ext4_extents.h (Mingming Cao 2009-09-28 15:49:08 -0400 217) {
0031462b5b392 fs/ext4/ext4_extents.h (Mingming Cao 2009-09-28 15:49:08 -0400 218) ext->ee_len = cpu_to_le16(ext4_ext_get_actual_len(ext));
0031462b5b392 fs/ext4/ext4_extents.h (Mingming Cao 2009-09-28 15:49:08 -0400 219) }
0031462b5b392 fs/ext4/ext4_extents.h (Mingming Cao 2009-09-28 15:49:08 -0400 220)
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 221) /*
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 222) * ext4_ext_pblock:
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 223) * combine low and high parts of physical block number into ext4_fsblk_t
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 224) */
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 225) static inline ext4_fsblk_t ext4_ext_pblock(struct ext4_extent *ex)
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 226) {
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 227) ext4_fsblk_t block;
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 228)
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 229) block = le32_to_cpu(ex->ee_start_lo);
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 230) block |= ((ext4_fsblk_t) le16_to_cpu(ex->ee_start_hi) << 31) << 1;
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 231) return block;
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 232) }
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 233)
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 234) /*
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 235) * ext4_idx_pblock:
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 236) * combine low and high parts of a leaf physical block number into ext4_fsblk_t
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 237) */
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 238) static inline ext4_fsblk_t ext4_idx_pblock(struct ext4_extent_idx *ix)
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 239) {
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 240) ext4_fsblk_t block;
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 241)
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 242) block = le32_to_cpu(ix->ei_leaf_lo);
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 243) block |= ((ext4_fsblk_t) le16_to_cpu(ix->ei_leaf_hi) << 31) << 1;
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 244) return block;
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 245) }
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 246)
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 247) /*
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 248) * ext4_ext_store_pblock:
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 249) * stores a large physical block number into an extent struct,
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 250) * breaking it into parts
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 251) */
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 252) static inline void ext4_ext_store_pblock(struct ext4_extent *ex,
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 253) ext4_fsblk_t pb)
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 254) {
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 255) ex->ee_start_lo = cpu_to_le32((unsigned long) (pb & 0xffffffff));
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 256) ex->ee_start_hi = cpu_to_le16((unsigned long) ((pb >> 31) >> 1) &
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 257) 0xffff);
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 258) }
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 259)
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 260) /*
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 261) * ext4_idx_store_pblock:
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 262) * stores a large physical block number into an index struct,
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 263) * breaking it into parts
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 264) */
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 265) static inline void ext4_idx_store_pblock(struct ext4_extent_idx *ix,
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 266) ext4_fsblk_t pb)
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 267) {
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 268) ix->ei_leaf_lo = cpu_to_le32((unsigned long) (pb & 0xffffffff));
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 269) ix->ei_leaf_hi = cpu_to_le16((unsigned long) ((pb >> 31) >> 1) &
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 270) 0xffff);
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 271) }
bf89d16f6ef53 fs/ext4/ext4_extents.h (Theodore Ts'o 2010-10-27 21:30:14 -0400 272)
3dcf54515aa49 fs/ext4/ext4_extents.h (Christoph Hellwig 2008-04-29 18:13:32 -0400 273) #endif /* _EXT4_EXTENTS */
a86c61812637c include/linux/ext4_fs_extents.h (Alex Tomas 2006-10-11 01:21:03 -0700 274)
VisionFive2 Linux kernel
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