Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1 | /* |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 2 | * linux/fs/ext4/ialloc.c |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 1992, 1993, 1994, 1995 |
| 5 | * Remy Card (card@masi.ibp.fr) |
| 6 | * Laboratoire MASI - Institut Blaise Pascal |
| 7 | * Universite Pierre et Marie Curie (Paris VI) |
| 8 | * |
| 9 | * BSD ufs-inspired inode and directory allocation by |
| 10 | * Stephen Tweedie (sct@redhat.com), 1993 |
| 11 | * Big-endian to little-endian byte-swapping/bitmaps by |
| 12 | * David S. Miller (davem@caip.rutgers.edu), 1995 |
| 13 | */ |
| 14 | |
| 15 | #include <linux/time.h> |
| 16 | #include <linux/fs.h> |
Mingming Cao | dab291a | 2006-10-11 01:21:01 -0700 | [diff] [blame] | 17 | #include <linux/jbd2.h> |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 18 | #include <linux/stat.h> |
| 19 | #include <linux/string.h> |
| 20 | #include <linux/quotaops.h> |
| 21 | #include <linux/buffer_head.h> |
| 22 | #include <linux/random.h> |
| 23 | #include <linux/bitops.h> |
Mingming Cao | 3a5b2ec | 2006-10-11 01:21:05 -0700 | [diff] [blame] | 24 | #include <linux/blkdev.h> |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 25 | #include <asm/byteorder.h> |
Theodore Ts'o | 9bffad1 | 2009-06-17 11:48:11 -0400 | [diff] [blame] | 26 | |
Christoph Hellwig | 3dcf545 | 2008-04-29 18:13:32 -0400 | [diff] [blame] | 27 | #include "ext4.h" |
| 28 | #include "ext4_jbd2.h" |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 29 | #include "xattr.h" |
| 30 | #include "acl.h" |
| 31 | |
Theodore Ts'o | 9bffad1 | 2009-06-17 11:48:11 -0400 | [diff] [blame] | 32 | #include <trace/events/ext4.h> |
| 33 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 34 | /* |
| 35 | * ialloc.c contains the inodes allocation and deallocation routines |
| 36 | */ |
| 37 | |
| 38 | /* |
| 39 | * The free inodes are managed by bitmaps. A file system contains several |
| 40 | * blocks groups. Each group contains 1 bitmap block for blocks, 1 bitmap |
| 41 | * block for inodes, N blocks for the inode table and data blocks. |
| 42 | * |
| 43 | * The file system contains group descriptors which are located after the |
| 44 | * super block. Each descriptor contains the number of the bitmap block and |
| 45 | * the free blocks count in the block. |
| 46 | */ |
| 47 | |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 48 | /* |
| 49 | * To avoid calling the atomic setbit hundreds or thousands of times, we only |
| 50 | * need to use it within a single byte (to ensure we get endianness right). |
| 51 | * We can use memset for the rest of the bitmap as there are no other users. |
| 52 | */ |
Theodore Ts'o | 61d0867 | 2010-10-27 21:30:15 -0400 | [diff] [blame] | 53 | void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap) |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 54 | { |
| 55 | int i; |
| 56 | |
| 57 | if (start_bit >= end_bit) |
| 58 | return; |
| 59 | |
| 60 | ext4_debug("mark end bits +%d through +%d used\n", start_bit, end_bit); |
| 61 | for (i = start_bit; i < ((start_bit + 7) & ~7UL); i++) |
| 62 | ext4_set_bit(i, bitmap); |
| 63 | if (i < end_bit) |
| 64 | memset(bitmap + (i >> 3), 0xff, (end_bit - i) >> 3); |
| 65 | } |
| 66 | |
| 67 | /* Initializes an uninitialized inode bitmap */ |
Theodore Ts'o | 1f109d5 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 68 | static unsigned ext4_init_inode_bitmap(struct super_block *sb, |
| 69 | struct buffer_head *bh, |
| 70 | ext4_group_t block_group, |
| 71 | struct ext4_group_desc *gdp) |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 72 | { |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 73 | J_ASSERT_BH(bh, buffer_locked(bh)); |
| 74 | |
| 75 | /* If checksum is bad mark all blocks and inodes use to prevent |
| 76 | * allocation, essentially implementing a per-group read-only flag. */ |
Darrick J. Wong | feb0ab3 | 2012-04-29 18:45:10 -0400 | [diff] [blame] | 77 | if (!ext4_group_desc_csum_verify(sb, block_group, gdp)) { |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 78 | ext4_error(sb, "Checksum bad for group %u", block_group); |
Theodore Ts'o | 021b65b | 2011-09-09 19:08:51 -0400 | [diff] [blame] | 79 | ext4_free_group_clusters_set(sb, gdp, 0); |
Aneesh Kumar K.V | 560671a | 2009-01-05 22:20:24 -0500 | [diff] [blame] | 80 | ext4_free_inodes_set(sb, gdp, 0); |
| 81 | ext4_itable_unused_set(sb, gdp, 0); |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 82 | memset(bh->b_data, 0xff, sb->s_blocksize); |
Darrick J. Wong | 41a246d | 2012-04-29 18:33:10 -0400 | [diff] [blame] | 83 | ext4_inode_bitmap_csum_set(sb, block_group, gdp, bh, |
| 84 | EXT4_INODES_PER_GROUP(sb) / 8); |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 85 | return 0; |
| 86 | } |
| 87 | |
| 88 | memset(bh->b_data, 0, (EXT4_INODES_PER_GROUP(sb) + 7) / 8); |
Theodore Ts'o | 61d0867 | 2010-10-27 21:30:15 -0400 | [diff] [blame] | 89 | ext4_mark_bitmap_end(EXT4_INODES_PER_GROUP(sb), sb->s_blocksize * 8, |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 90 | bh->b_data); |
Darrick J. Wong | 41a246d | 2012-04-29 18:33:10 -0400 | [diff] [blame] | 91 | ext4_inode_bitmap_csum_set(sb, block_group, gdp, bh, |
| 92 | EXT4_INODES_PER_GROUP(sb) / 8); |
Darrick J. Wong | feb0ab3 | 2012-04-29 18:45:10 -0400 | [diff] [blame] | 93 | ext4_group_desc_csum_set(sb, block_group, gdp); |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 94 | |
| 95 | return EXT4_INODES_PER_GROUP(sb); |
| 96 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 97 | |
Theodore Ts'o | 813e572 | 2012-02-20 17:52:46 -0500 | [diff] [blame] | 98 | void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate) |
| 99 | { |
| 100 | if (uptodate) { |
| 101 | set_buffer_uptodate(bh); |
| 102 | set_bitmap_uptodate(bh); |
| 103 | } |
| 104 | unlock_buffer(bh); |
| 105 | put_bh(bh); |
| 106 | } |
| 107 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 108 | /* |
| 109 | * Read the inode allocation bitmap for a given block_group, reading |
| 110 | * into the specified slot in the superblock's bitmap cache. |
| 111 | * |
| 112 | * Return buffer_head of bitmap on success or NULL. |
| 113 | */ |
| 114 | static struct buffer_head * |
Eric Sandeen | e29d1cd | 2008-08-02 21:21:02 -0400 | [diff] [blame] | 115 | ext4_read_inode_bitmap(struct super_block *sb, ext4_group_t block_group) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 116 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 117 | struct ext4_group_desc *desc; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 118 | struct buffer_head *bh = NULL; |
Eric Sandeen | e29d1cd | 2008-08-02 21:21:02 -0400 | [diff] [blame] | 119 | ext4_fsblk_t bitmap_blk; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 120 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 121 | desc = ext4_get_group_desc(sb, block_group, NULL); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 122 | if (!desc) |
Eric Sandeen | e29d1cd | 2008-08-02 21:21:02 -0400 | [diff] [blame] | 123 | return NULL; |
Lukas Czerner | bfff687 | 2010-10-27 21:30:05 -0400 | [diff] [blame] | 124 | |
Eric Sandeen | e29d1cd | 2008-08-02 21:21:02 -0400 | [diff] [blame] | 125 | bitmap_blk = ext4_inode_bitmap(sb, desc); |
| 126 | bh = sb_getblk(sb, bitmap_blk); |
| 127 | if (unlikely(!bh)) { |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 128 | ext4_error(sb, "Cannot read inode bitmap - " |
Theodore Ts'o | a9df9a4 | 2009-01-05 22:18:16 -0500 | [diff] [blame] | 129 | "block_group = %u, inode_bitmap = %llu", |
Eric Sandeen | e29d1cd | 2008-08-02 21:21:02 -0400 | [diff] [blame] | 130 | block_group, bitmap_blk); |
| 131 | return NULL; |
| 132 | } |
Aneesh Kumar K.V | 2ccb5fb | 2009-01-05 21:49:55 -0500 | [diff] [blame] | 133 | if (bitmap_uptodate(bh)) |
Darrick J. Wong | 41a246d | 2012-04-29 18:33:10 -0400 | [diff] [blame] | 134 | goto verify; |
Eric Sandeen | e29d1cd | 2008-08-02 21:21:02 -0400 | [diff] [blame] | 135 | |
Frederic Bohe | c806e68 | 2008-10-10 08:09:18 -0400 | [diff] [blame] | 136 | lock_buffer(bh); |
Aneesh Kumar K.V | 2ccb5fb | 2009-01-05 21:49:55 -0500 | [diff] [blame] | 137 | if (bitmap_uptodate(bh)) { |
| 138 | unlock_buffer(bh); |
Darrick J. Wong | 41a246d | 2012-04-29 18:33:10 -0400 | [diff] [blame] | 139 | goto verify; |
Aneesh Kumar K.V | 2ccb5fb | 2009-01-05 21:49:55 -0500 | [diff] [blame] | 140 | } |
Lukas Czerner | bfff687 | 2010-10-27 21:30:05 -0400 | [diff] [blame] | 141 | |
Aneesh Kumar K.V | 955ce5f | 2009-05-02 20:35:09 -0400 | [diff] [blame] | 142 | ext4_lock_group(sb, block_group); |
Eric Sandeen | e29d1cd | 2008-08-02 21:21:02 -0400 | [diff] [blame] | 143 | if (desc->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) { |
| 144 | ext4_init_inode_bitmap(sb, bh, block_group, desc); |
Aneesh Kumar K.V | 2ccb5fb | 2009-01-05 21:49:55 -0500 | [diff] [blame] | 145 | set_bitmap_uptodate(bh); |
Eric Sandeen | e29d1cd | 2008-08-02 21:21:02 -0400 | [diff] [blame] | 146 | set_buffer_uptodate(bh); |
Darrick J. Wong | 41a246d | 2012-04-29 18:33:10 -0400 | [diff] [blame] | 147 | set_buffer_verified(bh); |
Aneesh Kumar K.V | 955ce5f | 2009-05-02 20:35:09 -0400 | [diff] [blame] | 148 | ext4_unlock_group(sb, block_group); |
Aneesh Kumar K.V | 3300bed | 2009-01-03 22:33:39 -0500 | [diff] [blame] | 149 | unlock_buffer(bh); |
Eric Sandeen | e29d1cd | 2008-08-02 21:21:02 -0400 | [diff] [blame] | 150 | return bh; |
| 151 | } |
Aneesh Kumar K.V | 955ce5f | 2009-05-02 20:35:09 -0400 | [diff] [blame] | 152 | ext4_unlock_group(sb, block_group); |
Lukas Czerner | bfff687 | 2010-10-27 21:30:05 -0400 | [diff] [blame] | 153 | |
Aneesh Kumar K.V | 2ccb5fb | 2009-01-05 21:49:55 -0500 | [diff] [blame] | 154 | if (buffer_uptodate(bh)) { |
| 155 | /* |
| 156 | * if not uninit if bh is uptodate, |
| 157 | * bitmap is also uptodate |
| 158 | */ |
| 159 | set_bitmap_uptodate(bh); |
| 160 | unlock_buffer(bh); |
Darrick J. Wong | 41a246d | 2012-04-29 18:33:10 -0400 | [diff] [blame] | 161 | goto verify; |
Aneesh Kumar K.V | 2ccb5fb | 2009-01-05 21:49:55 -0500 | [diff] [blame] | 162 | } |
| 163 | /* |
Theodore Ts'o | 813e572 | 2012-02-20 17:52:46 -0500 | [diff] [blame] | 164 | * submit the buffer_head for reading |
Aneesh Kumar K.V | 2ccb5fb | 2009-01-05 21:49:55 -0500 | [diff] [blame] | 165 | */ |
Jiaying Zhang | 0562e0b | 2011-03-21 21:38:05 -0400 | [diff] [blame] | 166 | trace_ext4_load_inode_bitmap(sb, block_group); |
Theodore Ts'o | 813e572 | 2012-02-20 17:52:46 -0500 | [diff] [blame] | 167 | bh->b_end_io = ext4_end_bitmap_read; |
| 168 | get_bh(bh); |
| 169 | submit_bh(READ, bh); |
| 170 | wait_on_buffer(bh); |
| 171 | if (!buffer_uptodate(bh)) { |
Eric Sandeen | e29d1cd | 2008-08-02 21:21:02 -0400 | [diff] [blame] | 172 | put_bh(bh); |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 173 | ext4_error(sb, "Cannot read inode bitmap - " |
Theodore Ts'o | 813e572 | 2012-02-20 17:52:46 -0500 | [diff] [blame] | 174 | "block_group = %u, inode_bitmap = %llu", |
| 175 | block_group, bitmap_blk); |
Eric Sandeen | e29d1cd | 2008-08-02 21:21:02 -0400 | [diff] [blame] | 176 | return NULL; |
| 177 | } |
Darrick J. Wong | 41a246d | 2012-04-29 18:33:10 -0400 | [diff] [blame] | 178 | |
| 179 | verify: |
| 180 | ext4_lock_group(sb, block_group); |
| 181 | if (!buffer_verified(bh) && |
| 182 | !ext4_inode_bitmap_csum_verify(sb, block_group, desc, bh, |
| 183 | EXT4_INODES_PER_GROUP(sb) / 8)) { |
| 184 | ext4_unlock_group(sb, block_group); |
| 185 | put_bh(bh); |
| 186 | ext4_error(sb, "Corrupt inode bitmap - block_group = %u, " |
| 187 | "inode_bitmap = %llu", block_group, bitmap_blk); |
| 188 | return NULL; |
| 189 | } |
| 190 | ext4_unlock_group(sb, block_group); |
| 191 | set_buffer_verified(bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 192 | return bh; |
| 193 | } |
| 194 | |
| 195 | /* |
| 196 | * NOTE! When we get the inode, we're the only people |
| 197 | * that have access to it, and as such there are no |
| 198 | * race conditions we have to worry about. The inode |
| 199 | * is not on the hash-lists, and it cannot be reached |
| 200 | * through the filesystem because the directory entry |
| 201 | * has been deleted earlier. |
| 202 | * |
| 203 | * HOWEVER: we must make sure that we get no aliases, |
| 204 | * which means that we have to call "clear_inode()" |
| 205 | * _before_ we mark the inode not in use in the inode |
| 206 | * bitmaps. Otherwise a newly created file might use |
| 207 | * the same inode number (not actually the same pointer |
| 208 | * though), and then we'd have two inodes sharing the |
| 209 | * same inode number and space on the harddisk. |
| 210 | */ |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 211 | void ext4_free_inode(handle_t *handle, struct inode *inode) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 212 | { |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 213 | struct super_block *sb = inode->i_sb; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 214 | int is_directory; |
| 215 | unsigned long ino; |
| 216 | struct buffer_head *bitmap_bh = NULL; |
| 217 | struct buffer_head *bh2; |
Avantika Mathur | fd2d429 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 218 | ext4_group_t block_group; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 219 | unsigned long bit; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 220 | struct ext4_group_desc *gdp; |
| 221 | struct ext4_super_block *es; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 222 | struct ext4_sb_info *sbi; |
Eric Sandeen | 7ce9d5d | 2009-03-04 18:38:18 -0500 | [diff] [blame] | 223 | int fatal = 0, err, count, cleared; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 224 | |
Theodore Ts'o | 92b9781 | 2012-03-19 23:41:49 -0400 | [diff] [blame] | 225 | if (!sb) { |
| 226 | printk(KERN_ERR "EXT4-fs: %s:%d: inode on " |
| 227 | "nonexistent device\n", __func__, __LINE__); |
| 228 | return; |
| 229 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 230 | if (atomic_read(&inode->i_count) > 1) { |
Theodore Ts'o | 92b9781 | 2012-03-19 23:41:49 -0400 | [diff] [blame] | 231 | ext4_msg(sb, KERN_ERR, "%s:%d: inode #%lu: count=%d", |
| 232 | __func__, __LINE__, inode->i_ino, |
| 233 | atomic_read(&inode->i_count)); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 234 | return; |
| 235 | } |
| 236 | if (inode->i_nlink) { |
Theodore Ts'o | 92b9781 | 2012-03-19 23:41:49 -0400 | [diff] [blame] | 237 | ext4_msg(sb, KERN_ERR, "%s:%d: inode #%lu: nlink=%d\n", |
| 238 | __func__, __LINE__, inode->i_ino, inode->i_nlink); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 239 | return; |
| 240 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 241 | sbi = EXT4_SB(sb); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 242 | |
| 243 | ino = inode->i_ino; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 244 | ext4_debug("freeing inode %lu\n", ino); |
Theodore Ts'o | 9bffad1 | 2009-06-17 11:48:11 -0400 | [diff] [blame] | 245 | trace_ext4_free_inode(inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 246 | |
| 247 | /* |
| 248 | * Note: we must free any quota before locking the superblock, |
| 249 | * as writing the quota to disk may need the lock as well. |
| 250 | */ |
Christoph Hellwig | 871a293 | 2010-03-03 09:05:07 -0500 | [diff] [blame] | 251 | dquot_initialize(inode); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 252 | ext4_xattr_delete_inode(handle, inode); |
Christoph Hellwig | 63936dd | 2010-03-03 09:05:01 -0500 | [diff] [blame] | 253 | dquot_free_inode(inode); |
Christoph Hellwig | 9f75475 | 2010-03-03 09:05:05 -0500 | [diff] [blame] | 254 | dquot_drop(inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 255 | |
| 256 | is_directory = S_ISDIR(inode->i_mode); |
| 257 | |
| 258 | /* Do this BEFORE marking the inode not in use or returning an error */ |
Al Viro | 0930fcc | 2010-06-07 13:16:22 -0400 | [diff] [blame] | 259 | ext4_clear_inode(inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 260 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 261 | es = EXT4_SB(sb)->s_es; |
| 262 | if (ino < EXT4_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) { |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 263 | ext4_error(sb, "reserved or nonexistent inode %lu", ino); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 264 | goto error_return; |
| 265 | } |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 266 | block_group = (ino - 1) / EXT4_INODES_PER_GROUP(sb); |
| 267 | bit = (ino - 1) % EXT4_INODES_PER_GROUP(sb); |
Eric Sandeen | e29d1cd | 2008-08-02 21:21:02 -0400 | [diff] [blame] | 268 | bitmap_bh = ext4_read_inode_bitmap(sb, block_group); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 269 | if (!bitmap_bh) |
| 270 | goto error_return; |
| 271 | |
| 272 | BUFFER_TRACE(bitmap_bh, "get_write_access"); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 273 | fatal = ext4_journal_get_write_access(handle, bitmap_bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 274 | if (fatal) |
| 275 | goto error_return; |
| 276 | |
Dmitry Monakhov | d17413c | 2010-05-16 07:00:00 -0400 | [diff] [blame] | 277 | fatal = -ESRCH; |
| 278 | gdp = ext4_get_group_desc(sb, block_group, &bh2); |
| 279 | if (gdp) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 280 | BUFFER_TRACE(bh2, "get_write_access"); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 281 | fatal = ext4_journal_get_write_access(handle, bh2); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 282 | } |
Dmitry Monakhov | d17413c | 2010-05-16 07:00:00 -0400 | [diff] [blame] | 283 | ext4_lock_group(sb, block_group); |
Akinobu Mita | 597d508 | 2011-12-28 20:32:07 -0500 | [diff] [blame] | 284 | cleared = ext4_test_and_clear_bit(bit, bitmap_bh->b_data); |
Dmitry Monakhov | d17413c | 2010-05-16 07:00:00 -0400 | [diff] [blame] | 285 | if (fatal || !cleared) { |
| 286 | ext4_unlock_group(sb, block_group); |
| 287 | goto out; |
| 288 | } |
| 289 | |
| 290 | count = ext4_free_inodes_count(sb, gdp) + 1; |
| 291 | ext4_free_inodes_set(sb, gdp, count); |
| 292 | if (is_directory) { |
| 293 | count = ext4_used_dirs_count(sb, gdp) - 1; |
| 294 | ext4_used_dirs_set(sb, gdp, count); |
| 295 | percpu_counter_dec(&sbi->s_dirs_counter); |
| 296 | } |
Darrick J. Wong | 41a246d | 2012-04-29 18:33:10 -0400 | [diff] [blame] | 297 | ext4_inode_bitmap_csum_set(sb, block_group, gdp, bitmap_bh, |
| 298 | EXT4_INODES_PER_GROUP(sb) / 8); |
Darrick J. Wong | feb0ab3 | 2012-04-29 18:45:10 -0400 | [diff] [blame] | 299 | ext4_group_desc_csum_set(sb, block_group, gdp); |
Dmitry Monakhov | d17413c | 2010-05-16 07:00:00 -0400 | [diff] [blame] | 300 | ext4_unlock_group(sb, block_group); |
| 301 | |
| 302 | percpu_counter_inc(&sbi->s_freeinodes_counter); |
| 303 | if (sbi->s_log_groups_per_flex) { |
| 304 | ext4_group_t f = ext4_flex_group(sbi, block_group); |
| 305 | |
| 306 | atomic_inc(&sbi->s_flex_groups[f].free_inodes); |
| 307 | if (is_directory) |
| 308 | atomic_dec(&sbi->s_flex_groups[f].used_dirs); |
| 309 | } |
| 310 | BUFFER_TRACE(bh2, "call ext4_handle_dirty_metadata"); |
| 311 | fatal = ext4_handle_dirty_metadata(handle, NULL, bh2); |
| 312 | out: |
| 313 | if (cleared) { |
| 314 | BUFFER_TRACE(bitmap_bh, "call ext4_handle_dirty_metadata"); |
| 315 | err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh); |
| 316 | if (!fatal) |
| 317 | fatal = err; |
Dmitry Monakhov | d17413c | 2010-05-16 07:00:00 -0400 | [diff] [blame] | 318 | } else |
| 319 | ext4_error(sb, "bit already cleared for inode %lu", ino); |
| 320 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 321 | error_return: |
| 322 | brelse(bitmap_bh); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 323 | ext4_std_error(sb, fatal); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 324 | } |
| 325 | |
Theodore Ts'o | a491212 | 2009-03-12 12:18:34 -0400 | [diff] [blame] | 326 | struct orlov_stats { |
| 327 | __u32 free_inodes; |
Theodore Ts'o | 24aaa8e | 2011-09-09 18:58:51 -0400 | [diff] [blame] | 328 | __u32 free_clusters; |
Theodore Ts'o | a491212 | 2009-03-12 12:18:34 -0400 | [diff] [blame] | 329 | __u32 used_dirs; |
| 330 | }; |
| 331 | |
| 332 | /* |
| 333 | * Helper function for Orlov's allocator; returns critical information |
| 334 | * for a particular block group or flex_bg. If flex_size is 1, then g |
| 335 | * is a block group number; otherwise it is flex_bg number. |
| 336 | */ |
Theodore Ts'o | 1f109d5 | 2010-10-27 21:30:14 -0400 | [diff] [blame] | 337 | static void get_orlov_stats(struct super_block *sb, ext4_group_t g, |
| 338 | int flex_size, struct orlov_stats *stats) |
Theodore Ts'o | a491212 | 2009-03-12 12:18:34 -0400 | [diff] [blame] | 339 | { |
| 340 | struct ext4_group_desc *desc; |
Theodore Ts'o | 7d39db1 | 2009-03-04 19:31:53 -0500 | [diff] [blame] | 341 | struct flex_groups *flex_group = EXT4_SB(sb)->s_flex_groups; |
Theodore Ts'o | a491212 | 2009-03-12 12:18:34 -0400 | [diff] [blame] | 342 | |
Theodore Ts'o | 7d39db1 | 2009-03-04 19:31:53 -0500 | [diff] [blame] | 343 | if (flex_size > 1) { |
| 344 | stats->free_inodes = atomic_read(&flex_group[g].free_inodes); |
Theodore Ts'o | 24aaa8e | 2011-09-09 18:58:51 -0400 | [diff] [blame] | 345 | stats->free_clusters = atomic_read(&flex_group[g].free_clusters); |
Theodore Ts'o | 7d39db1 | 2009-03-04 19:31:53 -0500 | [diff] [blame] | 346 | stats->used_dirs = atomic_read(&flex_group[g].used_dirs); |
| 347 | return; |
| 348 | } |
Theodore Ts'o | a491212 | 2009-03-12 12:18:34 -0400 | [diff] [blame] | 349 | |
Theodore Ts'o | 7d39db1 | 2009-03-04 19:31:53 -0500 | [diff] [blame] | 350 | desc = ext4_get_group_desc(sb, g, NULL); |
| 351 | if (desc) { |
| 352 | stats->free_inodes = ext4_free_inodes_count(sb, desc); |
Theodore Ts'o | 021b65b | 2011-09-09 19:08:51 -0400 | [diff] [blame] | 353 | stats->free_clusters = ext4_free_group_clusters(sb, desc); |
Theodore Ts'o | 7d39db1 | 2009-03-04 19:31:53 -0500 | [diff] [blame] | 354 | stats->used_dirs = ext4_used_dirs_count(sb, desc); |
| 355 | } else { |
| 356 | stats->free_inodes = 0; |
Theodore Ts'o | 24aaa8e | 2011-09-09 18:58:51 -0400 | [diff] [blame] | 357 | stats->free_clusters = 0; |
Theodore Ts'o | 7d39db1 | 2009-03-04 19:31:53 -0500 | [diff] [blame] | 358 | stats->used_dirs = 0; |
Theodore Ts'o | a491212 | 2009-03-12 12:18:34 -0400 | [diff] [blame] | 359 | } |
| 360 | } |
| 361 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 362 | /* |
| 363 | * Orlov's allocator for directories. |
| 364 | * |
| 365 | * We always try to spread first-level directories. |
| 366 | * |
| 367 | * If there are blockgroups with both free inodes and free blocks counts |
| 368 | * not worse than average we return one with smallest directory count. |
| 369 | * Otherwise we simply return a random group. |
| 370 | * |
| 371 | * For the rest rules look so: |
| 372 | * |
| 373 | * It's OK to put directory into a group unless |
| 374 | * it has too many directories already (max_dirs) or |
| 375 | * it has too few free inodes left (min_inodes) or |
| 376 | * it has too few free blocks left (min_blocks) or |
Benoit Boissinot | 1cc8dcf5 | 2008-04-21 22:45:55 +0000 | [diff] [blame] | 377 | * Parent's group is preferred, if it doesn't satisfy these |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 378 | * conditions we search cyclically through the rest. If none |
| 379 | * of the groups look good we just look for a group with more |
| 380 | * free inodes than average (starting at parent's group). |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 381 | */ |
| 382 | |
Avantika Mathur | 2aa9fc4 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 383 | static int find_group_orlov(struct super_block *sb, struct inode *parent, |
Al Viro | dcca3fe | 2011-07-26 02:48:06 -0400 | [diff] [blame] | 384 | ext4_group_t *group, umode_t mode, |
Theodore Ts'o | f157a4a | 2009-06-13 11:09:42 -0400 | [diff] [blame] | 385 | const struct qstr *qstr) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 386 | { |
Avantika Mathur | fd2d429 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 387 | ext4_group_t parent_group = EXT4_I(parent)->i_block_group; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 388 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
Theodore Ts'o | 8df9675 | 2009-05-01 08:50:38 -0400 | [diff] [blame] | 389 | ext4_group_t real_ngroups = ext4_get_groups_count(sb); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 390 | int inodes_per_group = EXT4_INODES_PER_GROUP(sb); |
Theodore Ts'o | 14c83c9 | 2011-12-28 20:25:13 -0500 | [diff] [blame] | 391 | unsigned int freei, avefreei, grp_free; |
Theodore Ts'o | 24aaa8e | 2011-09-09 18:58:51 -0400 | [diff] [blame] | 392 | ext4_fsblk_t freeb, avefreec; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 393 | unsigned int ndirs; |
Theodore Ts'o | a491212 | 2009-03-12 12:18:34 -0400 | [diff] [blame] | 394 | int max_dirs, min_inodes; |
Theodore Ts'o | 24aaa8e | 2011-09-09 18:58:51 -0400 | [diff] [blame] | 395 | ext4_grpblk_t min_clusters; |
Theodore Ts'o | 8df9675 | 2009-05-01 08:50:38 -0400 | [diff] [blame] | 396 | ext4_group_t i, grp, g, ngroups; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 397 | struct ext4_group_desc *desc; |
Theodore Ts'o | a491212 | 2009-03-12 12:18:34 -0400 | [diff] [blame] | 398 | struct orlov_stats stats; |
| 399 | int flex_size = ext4_flex_bg_size(sbi); |
Theodore Ts'o | f157a4a | 2009-06-13 11:09:42 -0400 | [diff] [blame] | 400 | struct dx_hash_info hinfo; |
Theodore Ts'o | a491212 | 2009-03-12 12:18:34 -0400 | [diff] [blame] | 401 | |
Theodore Ts'o | 8df9675 | 2009-05-01 08:50:38 -0400 | [diff] [blame] | 402 | ngroups = real_ngroups; |
Theodore Ts'o | a491212 | 2009-03-12 12:18:34 -0400 | [diff] [blame] | 403 | if (flex_size > 1) { |
Theodore Ts'o | 8df9675 | 2009-05-01 08:50:38 -0400 | [diff] [blame] | 404 | ngroups = (real_ngroups + flex_size - 1) >> |
Theodore Ts'o | a491212 | 2009-03-12 12:18:34 -0400 | [diff] [blame] | 405 | sbi->s_log_groups_per_flex; |
| 406 | parent_group >>= sbi->s_log_groups_per_flex; |
| 407 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 408 | |
| 409 | freei = percpu_counter_read_positive(&sbi->s_freeinodes_counter); |
| 410 | avefreei = freei / ngroups; |
Theodore Ts'o | 5704265 | 2011-09-09 18:56:51 -0400 | [diff] [blame] | 411 | freeb = EXT4_C2B(sbi, |
| 412 | percpu_counter_read_positive(&sbi->s_freeclusters_counter)); |
Theodore Ts'o | 24aaa8e | 2011-09-09 18:58:51 -0400 | [diff] [blame] | 413 | avefreec = freeb; |
| 414 | do_div(avefreec, ngroups); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 415 | ndirs = percpu_counter_read_positive(&sbi->s_dirs_counter); |
| 416 | |
Theodore Ts'o | a491212 | 2009-03-12 12:18:34 -0400 | [diff] [blame] | 417 | if (S_ISDIR(mode) && |
| 418 | ((parent == sb->s_root->d_inode) || |
Dmitry Monakhov | 12e9b89 | 2010-05-16 22:00:00 -0400 | [diff] [blame] | 419 | (ext4_test_inode_flag(parent, EXT4_INODE_TOPDIR)))) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 420 | int best_ndir = inodes_per_group; |
Avantika Mathur | 2aa9fc4 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 421 | int ret = -1; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 422 | |
Theodore Ts'o | f157a4a | 2009-06-13 11:09:42 -0400 | [diff] [blame] | 423 | if (qstr) { |
| 424 | hinfo.hash_version = DX_HASH_HALF_MD4; |
| 425 | hinfo.seed = sbi->s_hash_seed; |
| 426 | ext4fs_dirhash(qstr->name, qstr->len, &hinfo); |
| 427 | grp = hinfo.hash; |
| 428 | } else |
| 429 | get_random_bytes(&grp, sizeof(grp)); |
Avantika Mathur | 2aa9fc4 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 430 | parent_group = (unsigned)grp % ngroups; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 431 | for (i = 0; i < ngroups; i++) { |
Theodore Ts'o | a491212 | 2009-03-12 12:18:34 -0400 | [diff] [blame] | 432 | g = (parent_group + i) % ngroups; |
| 433 | get_orlov_stats(sb, g, flex_size, &stats); |
| 434 | if (!stats.free_inodes) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 435 | continue; |
Theodore Ts'o | a491212 | 2009-03-12 12:18:34 -0400 | [diff] [blame] | 436 | if (stats.used_dirs >= best_ndir) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 437 | continue; |
Theodore Ts'o | a491212 | 2009-03-12 12:18:34 -0400 | [diff] [blame] | 438 | if (stats.free_inodes < avefreei) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 439 | continue; |
Theodore Ts'o | 24aaa8e | 2011-09-09 18:58:51 -0400 | [diff] [blame] | 440 | if (stats.free_clusters < avefreec) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 441 | continue; |
Theodore Ts'o | a491212 | 2009-03-12 12:18:34 -0400 | [diff] [blame] | 442 | grp = g; |
Avantika Mathur | 2aa9fc4 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 443 | ret = 0; |
Theodore Ts'o | a491212 | 2009-03-12 12:18:34 -0400 | [diff] [blame] | 444 | best_ndir = stats.used_dirs; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 445 | } |
Theodore Ts'o | a491212 | 2009-03-12 12:18:34 -0400 | [diff] [blame] | 446 | if (ret) |
| 447 | goto fallback; |
| 448 | found_flex_bg: |
| 449 | if (flex_size == 1) { |
| 450 | *group = grp; |
| 451 | return 0; |
| 452 | } |
| 453 | |
| 454 | /* |
| 455 | * We pack inodes at the beginning of the flexgroup's |
| 456 | * inode tables. Block allocation decisions will do |
| 457 | * something similar, although regular files will |
| 458 | * start at 2nd block group of the flexgroup. See |
| 459 | * ext4_ext_find_goal() and ext4_find_near(). |
| 460 | */ |
| 461 | grp *= flex_size; |
| 462 | for (i = 0; i < flex_size; i++) { |
Theodore Ts'o | 8df9675 | 2009-05-01 08:50:38 -0400 | [diff] [blame] | 463 | if (grp+i >= real_ngroups) |
Theodore Ts'o | a491212 | 2009-03-12 12:18:34 -0400 | [diff] [blame] | 464 | break; |
| 465 | desc = ext4_get_group_desc(sb, grp+i, NULL); |
| 466 | if (desc && ext4_free_inodes_count(sb, desc)) { |
| 467 | *group = grp+i; |
| 468 | return 0; |
| 469 | } |
| 470 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 471 | goto fallback; |
| 472 | } |
| 473 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 474 | max_dirs = ndirs / ngroups + inodes_per_group / 16; |
Theodore Ts'o | a491212 | 2009-03-12 12:18:34 -0400 | [diff] [blame] | 475 | min_inodes = avefreei - inodes_per_group*flex_size / 4; |
| 476 | if (min_inodes < 1) |
| 477 | min_inodes = 1; |
Theodore Ts'o | 24aaa8e | 2011-09-09 18:58:51 -0400 | [diff] [blame] | 478 | min_clusters = avefreec - EXT4_CLUSTERS_PER_GROUP(sb)*flex_size / 4; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 479 | |
Theodore Ts'o | a491212 | 2009-03-12 12:18:34 -0400 | [diff] [blame] | 480 | /* |
| 481 | * Start looking in the flex group where we last allocated an |
| 482 | * inode for this parent directory |
| 483 | */ |
| 484 | if (EXT4_I(parent)->i_last_alloc_group != ~0) { |
| 485 | parent_group = EXT4_I(parent)->i_last_alloc_group; |
| 486 | if (flex_size > 1) |
| 487 | parent_group >>= sbi->s_log_groups_per_flex; |
| 488 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 489 | |
| 490 | for (i = 0; i < ngroups; i++) { |
Theodore Ts'o | a491212 | 2009-03-12 12:18:34 -0400 | [diff] [blame] | 491 | grp = (parent_group + i) % ngroups; |
| 492 | get_orlov_stats(sb, grp, flex_size, &stats); |
| 493 | if (stats.used_dirs >= max_dirs) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 494 | continue; |
Theodore Ts'o | a491212 | 2009-03-12 12:18:34 -0400 | [diff] [blame] | 495 | if (stats.free_inodes < min_inodes) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 496 | continue; |
Theodore Ts'o | 24aaa8e | 2011-09-09 18:58:51 -0400 | [diff] [blame] | 497 | if (stats.free_clusters < min_clusters) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 498 | continue; |
Theodore Ts'o | a491212 | 2009-03-12 12:18:34 -0400 | [diff] [blame] | 499 | goto found_flex_bg; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 500 | } |
| 501 | |
| 502 | fallback: |
Theodore Ts'o | 8df9675 | 2009-05-01 08:50:38 -0400 | [diff] [blame] | 503 | ngroups = real_ngroups; |
Theodore Ts'o | a491212 | 2009-03-12 12:18:34 -0400 | [diff] [blame] | 504 | avefreei = freei / ngroups; |
Theodore Ts'o | b5451f7 | 2009-04-22 21:00:36 -0400 | [diff] [blame] | 505 | fallback_retry: |
Theodore Ts'o | a491212 | 2009-03-12 12:18:34 -0400 | [diff] [blame] | 506 | parent_group = EXT4_I(parent)->i_block_group; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 507 | for (i = 0; i < ngroups; i++) { |
Theodore Ts'o | a491212 | 2009-03-12 12:18:34 -0400 | [diff] [blame] | 508 | grp = (parent_group + i) % ngroups; |
| 509 | desc = ext4_get_group_desc(sb, grp, NULL); |
Dan Carpenter | bb3d132 | 2012-05-28 14:16:57 -0400 | [diff] [blame] | 510 | if (desc) { |
| 511 | grp_free = ext4_free_inodes_count(sb, desc); |
| 512 | if (grp_free && grp_free >= avefreei) { |
| 513 | *group = grp; |
| 514 | return 0; |
| 515 | } |
Theodore Ts'o | a491212 | 2009-03-12 12:18:34 -0400 | [diff] [blame] | 516 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 517 | } |
| 518 | |
| 519 | if (avefreei) { |
| 520 | /* |
| 521 | * The free-inodes counter is approximate, and for really small |
| 522 | * filesystems the above test can fail to find any blockgroups |
| 523 | */ |
| 524 | avefreei = 0; |
Theodore Ts'o | b5451f7 | 2009-04-22 21:00:36 -0400 | [diff] [blame] | 525 | goto fallback_retry; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 526 | } |
| 527 | |
| 528 | return -1; |
| 529 | } |
| 530 | |
Avantika Mathur | 2aa9fc4 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 531 | static int find_group_other(struct super_block *sb, struct inode *parent, |
Al Viro | dcca3fe | 2011-07-26 02:48:06 -0400 | [diff] [blame] | 532 | ext4_group_t *group, umode_t mode) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 533 | { |
Avantika Mathur | fd2d429 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 534 | ext4_group_t parent_group = EXT4_I(parent)->i_block_group; |
Theodore Ts'o | 8df9675 | 2009-05-01 08:50:38 -0400 | [diff] [blame] | 535 | ext4_group_t i, last, ngroups = ext4_get_groups_count(sb); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 536 | struct ext4_group_desc *desc; |
Theodore Ts'o | a491212 | 2009-03-12 12:18:34 -0400 | [diff] [blame] | 537 | int flex_size = ext4_flex_bg_size(EXT4_SB(sb)); |
| 538 | |
| 539 | /* |
| 540 | * Try to place the inode is the same flex group as its |
| 541 | * parent. If we can't find space, use the Orlov algorithm to |
| 542 | * find another flex group, and store that information in the |
| 543 | * parent directory's inode information so that use that flex |
| 544 | * group for future allocations. |
| 545 | */ |
| 546 | if (flex_size > 1) { |
| 547 | int retry = 0; |
| 548 | |
| 549 | try_again: |
| 550 | parent_group &= ~(flex_size-1); |
| 551 | last = parent_group + flex_size; |
| 552 | if (last > ngroups) |
| 553 | last = ngroups; |
| 554 | for (i = parent_group; i < last; i++) { |
| 555 | desc = ext4_get_group_desc(sb, i, NULL); |
| 556 | if (desc && ext4_free_inodes_count(sb, desc)) { |
| 557 | *group = i; |
| 558 | return 0; |
| 559 | } |
| 560 | } |
| 561 | if (!retry && EXT4_I(parent)->i_last_alloc_group != ~0) { |
| 562 | retry = 1; |
| 563 | parent_group = EXT4_I(parent)->i_last_alloc_group; |
| 564 | goto try_again; |
| 565 | } |
| 566 | /* |
| 567 | * If this didn't work, use the Orlov search algorithm |
| 568 | * to find a new flex group; we pass in the mode to |
| 569 | * avoid the topdir algorithms. |
| 570 | */ |
| 571 | *group = parent_group + flex_size; |
| 572 | if (*group > ngroups) |
| 573 | *group = 0; |
Peter Huewe | 7dc5761 | 2011-02-21 21:01:42 -0500 | [diff] [blame] | 574 | return find_group_orlov(sb, parent, group, mode, NULL); |
Theodore Ts'o | a491212 | 2009-03-12 12:18:34 -0400 | [diff] [blame] | 575 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 576 | |
| 577 | /* |
| 578 | * Try to place the inode in its parent directory |
| 579 | */ |
Avantika Mathur | 2aa9fc4 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 580 | *group = parent_group; |
| 581 | desc = ext4_get_group_desc(sb, *group, NULL); |
Aneesh Kumar K.V | 560671a | 2009-01-05 22:20:24 -0500 | [diff] [blame] | 582 | if (desc && ext4_free_inodes_count(sb, desc) && |
Theodore Ts'o | 021b65b | 2011-09-09 19:08:51 -0400 | [diff] [blame] | 583 | ext4_free_group_clusters(sb, desc)) |
Avantika Mathur | 2aa9fc4 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 584 | return 0; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 585 | |
| 586 | /* |
| 587 | * We're going to place this inode in a different blockgroup from its |
| 588 | * parent. We want to cause files in a common directory to all land in |
| 589 | * the same blockgroup. But we want files which are in a different |
| 590 | * directory which shares a blockgroup with our parent to land in a |
| 591 | * different blockgroup. |
| 592 | * |
| 593 | * So add our directory's i_ino into the starting point for the hash. |
| 594 | */ |
Avantika Mathur | 2aa9fc4 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 595 | *group = (*group + parent->i_ino) % ngroups; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 596 | |
| 597 | /* |
| 598 | * Use a quadratic hash to find a group with a free inode and some free |
| 599 | * blocks. |
| 600 | */ |
| 601 | for (i = 1; i < ngroups; i <<= 1) { |
Avantika Mathur | 2aa9fc4 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 602 | *group += i; |
| 603 | if (*group >= ngroups) |
| 604 | *group -= ngroups; |
| 605 | desc = ext4_get_group_desc(sb, *group, NULL); |
Aneesh Kumar K.V | 560671a | 2009-01-05 22:20:24 -0500 | [diff] [blame] | 606 | if (desc && ext4_free_inodes_count(sb, desc) && |
Theodore Ts'o | 021b65b | 2011-09-09 19:08:51 -0400 | [diff] [blame] | 607 | ext4_free_group_clusters(sb, desc)) |
Avantika Mathur | 2aa9fc4 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 608 | return 0; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 609 | } |
| 610 | |
| 611 | /* |
| 612 | * That failed: try linear search for a free inode, even if that group |
| 613 | * has no free blocks. |
| 614 | */ |
Avantika Mathur | 2aa9fc4 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 615 | *group = parent_group; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 616 | for (i = 0; i < ngroups; i++) { |
Avantika Mathur | 2aa9fc4 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 617 | if (++*group >= ngroups) |
| 618 | *group = 0; |
| 619 | desc = ext4_get_group_desc(sb, *group, NULL); |
Aneesh Kumar K.V | 560671a | 2009-01-05 22:20:24 -0500 | [diff] [blame] | 620 | if (desc && ext4_free_inodes_count(sb, desc)) |
Avantika Mathur | 2aa9fc4 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 621 | return 0; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 622 | } |
| 623 | |
| 624 | return -1; |
| 625 | } |
| 626 | |
| 627 | /* |
| 628 | * There are two policies for allocating an inode. If the new inode is |
| 629 | * a directory, then a forward search is made for a block group with both |
| 630 | * free space and a low directory-to-inode ratio; if that fails, then of |
| 631 | * the groups with above-average free space, that group with the fewest |
| 632 | * directories already is chosen. |
| 633 | * |
| 634 | * For other inodes, search forward from the parent directory's block |
| 635 | * group to find a free inode. |
| 636 | */ |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 637 | struct inode *__ext4_new_inode(handle_t *handle, struct inode *dir, |
| 638 | umode_t mode, const struct qstr *qstr, |
| 639 | __u32 goal, uid_t *owner, int handle_type, |
| 640 | unsigned int line_no, int nblocks) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 641 | { |
| 642 | struct super_block *sb; |
Aneesh Kumar K.V | 3300bed | 2009-01-03 22:33:39 -0500 | [diff] [blame] | 643 | struct buffer_head *inode_bitmap_bh = NULL; |
| 644 | struct buffer_head *group_desc_bh; |
Theodore Ts'o | 8df9675 | 2009-05-01 08:50:38 -0400 | [diff] [blame] | 645 | ext4_group_t ngroups, group = 0; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 646 | unsigned long ino = 0; |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 647 | struct inode *inode; |
| 648 | struct ext4_group_desc *gdp = NULL; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 649 | struct ext4_inode_info *ei; |
| 650 | struct ext4_sb_info *sbi; |
Aneesh Kumar K.V | 3934186 | 2009-01-05 21:38:14 -0500 | [diff] [blame] | 651 | int ret2, err = 0; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 652 | struct inode *ret; |
Avantika Mathur | 2aa9fc4 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 653 | ext4_group_t i; |
Jose R. Santos | 772cb7c | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 654 | ext4_group_t flex_group; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 655 | |
| 656 | /* Cannot create files in a deleted directory */ |
| 657 | if (!dir || !dir->i_nlink) |
| 658 | return ERR_PTR(-EPERM); |
| 659 | |
| 660 | sb = dir->i_sb; |
Theodore Ts'o | 8df9675 | 2009-05-01 08:50:38 -0400 | [diff] [blame] | 661 | ngroups = ext4_get_groups_count(sb); |
Theodore Ts'o | 9bffad1 | 2009-06-17 11:48:11 -0400 | [diff] [blame] | 662 | trace_ext4_request_inode(dir, mode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 663 | inode = new_inode(sb); |
| 664 | if (!inode) |
| 665 | return ERR_PTR(-ENOMEM); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 666 | ei = EXT4_I(inode); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 667 | sbi = EXT4_SB(sb); |
Jose R. Santos | 772cb7c | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 668 | |
Andreas Dilger | 1101391 | 2009-06-13 11:45:35 -0400 | [diff] [blame] | 669 | if (!goal) |
| 670 | goal = sbi->s_inode_goal; |
| 671 | |
Johann Lombardi | e646286 | 2009-07-05 23:45:11 -0400 | [diff] [blame] | 672 | if (goal && goal <= le32_to_cpu(sbi->s_es->s_inodes_count)) { |
Andreas Dilger | 1101391 | 2009-06-13 11:45:35 -0400 | [diff] [blame] | 673 | group = (goal - 1) / EXT4_INODES_PER_GROUP(sb); |
| 674 | ino = (goal - 1) % EXT4_INODES_PER_GROUP(sb); |
| 675 | ret2 = 0; |
| 676 | goto got_group; |
| 677 | } |
| 678 | |
Lukas Czerner | 4113c4c | 2011-10-08 14:34:47 -0400 | [diff] [blame] | 679 | if (S_ISDIR(mode)) |
| 680 | ret2 = find_group_orlov(sb, dir, &group, mode, qstr); |
| 681 | else |
Theodore Ts'o | a491212 | 2009-03-12 12:18:34 -0400 | [diff] [blame] | 682 | ret2 = find_group_other(sb, dir, &group, mode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 683 | |
Jose R. Santos | 772cb7c | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 684 | got_group: |
Theodore Ts'o | a491212 | 2009-03-12 12:18:34 -0400 | [diff] [blame] | 685 | EXT4_I(dir)->i_last_alloc_group = group; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 686 | err = -ENOSPC; |
Avantika Mathur | 2aa9fc4 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 687 | if (ret2 == -1) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 688 | goto out; |
| 689 | |
Theodore Ts'o | 119c0d4 | 2012-02-06 20:12:03 -0500 | [diff] [blame] | 690 | /* |
| 691 | * Normally we will only go through one pass of this loop, |
| 692 | * unless we get unlucky and it turns out the group we selected |
| 693 | * had its last inode grabbed by someone else. |
| 694 | */ |
Andreas Dilger | 1101391 | 2009-06-13 11:45:35 -0400 | [diff] [blame] | 695 | for (i = 0; i < ngroups; i++, ino = 0) { |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 696 | err = -EIO; |
| 697 | |
Aneesh Kumar K.V | 3300bed | 2009-01-03 22:33:39 -0500 | [diff] [blame] | 698 | gdp = ext4_get_group_desc(sb, group, &group_desc_bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 699 | if (!gdp) |
| 700 | goto fail; |
| 701 | |
Yongqiang Yang | f2a09af | 2012-09-23 23:16:03 -0400 | [diff] [blame] | 702 | /* |
| 703 | * Check free inodes count before loading bitmap. |
| 704 | */ |
| 705 | if (ext4_free_inodes_count(sb, gdp) == 0) { |
| 706 | if (++group == ngroups) |
| 707 | group = 0; |
| 708 | continue; |
| 709 | } |
| 710 | |
Aneesh Kumar K.V | 3300bed | 2009-01-03 22:33:39 -0500 | [diff] [blame] | 711 | brelse(inode_bitmap_bh); |
| 712 | inode_bitmap_bh = ext4_read_inode_bitmap(sb, group); |
| 713 | if (!inode_bitmap_bh) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 714 | goto fail; |
| 715 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 716 | repeat_in_this_group: |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 717 | ino = ext4_find_next_zero_bit((unsigned long *) |
Aneesh Kumar K.V | 3300bed | 2009-01-03 22:33:39 -0500 | [diff] [blame] | 718 | inode_bitmap_bh->b_data, |
| 719 | EXT4_INODES_PER_GROUP(sb), ino); |
Theodore Ts'o | 119c0d4 | 2012-02-06 20:12:03 -0500 | [diff] [blame] | 720 | if (ino >= EXT4_INODES_PER_GROUP(sb)) { |
| 721 | if (++group == ngroups) |
| 722 | group = 0; |
| 723 | continue; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 724 | } |
Theodore Ts'o | 119c0d4 | 2012-02-06 20:12:03 -0500 | [diff] [blame] | 725 | if (group == 0 && (ino+1) < EXT4_FIRST_INO(sb)) { |
| 726 | ext4_error(sb, "reserved inode found cleared - " |
| 727 | "inode=%lu", ino + 1); |
| 728 | continue; |
| 729 | } |
Theodore Ts'o | 1139575 | 2013-02-09 16:27:09 -0500 | [diff] [blame] | 730 | if (!handle) { |
| 731 | BUG_ON(nblocks <= 0); |
| 732 | handle = __ext4_journal_start_sb(dir->i_sb, line_no, |
| 733 | handle_type, nblocks); |
| 734 | if (IS_ERR(handle)) { |
| 735 | err = PTR_ERR(handle); |
| 736 | goto fail; |
| 737 | } |
| 738 | } |
Eric Sandeen | ffb5387 | 2012-10-28 22:24:57 -0400 | [diff] [blame] | 739 | BUFFER_TRACE(inode_bitmap_bh, "get_write_access"); |
| 740 | err = ext4_journal_get_write_access(handle, inode_bitmap_bh); |
| 741 | if (err) |
| 742 | goto fail; |
Theodore Ts'o | 119c0d4 | 2012-02-06 20:12:03 -0500 | [diff] [blame] | 743 | ext4_lock_group(sb, group); |
| 744 | ret2 = ext4_test_and_set_bit(ino, inode_bitmap_bh->b_data); |
| 745 | ext4_unlock_group(sb, group); |
| 746 | ino++; /* the inode bitmap is zero-based */ |
| 747 | if (!ret2) |
| 748 | goto got; /* we grabbed the inode! */ |
| 749 | if (ino < EXT4_INODES_PER_GROUP(sb)) |
| 750 | goto repeat_in_this_group; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 751 | } |
| 752 | err = -ENOSPC; |
| 753 | goto out; |
| 754 | |
| 755 | got: |
Eric Sandeen | ffb5387 | 2012-10-28 22:24:57 -0400 | [diff] [blame] | 756 | BUFFER_TRACE(inode_bitmap_bh, "call ext4_handle_dirty_metadata"); |
| 757 | err = ext4_handle_dirty_metadata(handle, NULL, inode_bitmap_bh); |
| 758 | if (err) |
| 759 | goto fail; |
| 760 | |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 761 | /* We may have to initialize the block bitmap if it isn't already */ |
Darrick J. Wong | feb0ab3 | 2012-04-29 18:45:10 -0400 | [diff] [blame] | 762 | if (ext4_has_group_desc_csum(sb) && |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 763 | gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) { |
Aneesh Kumar K.V | 3300bed | 2009-01-03 22:33:39 -0500 | [diff] [blame] | 764 | struct buffer_head *block_bitmap_bh; |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 765 | |
Aneesh Kumar K.V | 3300bed | 2009-01-03 22:33:39 -0500 | [diff] [blame] | 766 | block_bitmap_bh = ext4_read_block_bitmap(sb, group); |
| 767 | BUFFER_TRACE(block_bitmap_bh, "get block bitmap access"); |
| 768 | err = ext4_journal_get_write_access(handle, block_bitmap_bh); |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 769 | if (err) { |
Aneesh Kumar K.V | 3300bed | 2009-01-03 22:33:39 -0500 | [diff] [blame] | 770 | brelse(block_bitmap_bh); |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 771 | goto fail; |
| 772 | } |
| 773 | |
Theodore Ts'o | fd034a8 | 2011-09-09 18:42:51 -0400 | [diff] [blame] | 774 | BUFFER_TRACE(block_bitmap_bh, "dirty block bitmap"); |
| 775 | err = ext4_handle_dirty_metadata(handle, NULL, block_bitmap_bh); |
Theodore Ts'o | fd034a8 | 2011-09-09 18:42:51 -0400 | [diff] [blame] | 776 | |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 777 | /* recheck and clear flag under lock if we still need to */ |
Theodore Ts'o | fd034a8 | 2011-09-09 18:42:51 -0400 | [diff] [blame] | 778 | ext4_lock_group(sb, group); |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 779 | if (gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) { |
Aneesh Kumar K.V | 3300bed | 2009-01-03 22:33:39 -0500 | [diff] [blame] | 780 | gdp->bg_flags &= cpu_to_le16(~EXT4_BG_BLOCK_UNINIT); |
Theodore Ts'o | 021b65b | 2011-09-09 19:08:51 -0400 | [diff] [blame] | 781 | ext4_free_group_clusters_set(sb, gdp, |
Theodore Ts'o | cff1dfd7 | 2011-09-09 19:12:51 -0400 | [diff] [blame] | 782 | ext4_free_clusters_after_init(sb, group, gdp)); |
Darrick J. Wong | fa77dcf | 2012-04-29 18:35:10 -0400 | [diff] [blame] | 783 | ext4_block_bitmap_csum_set(sb, group, gdp, |
Tao Ma | 79f1ba4 | 2012-10-22 00:34:32 -0400 | [diff] [blame] | 784 | block_bitmap_bh); |
Darrick J. Wong | feb0ab3 | 2012-04-29 18:45:10 -0400 | [diff] [blame] | 785 | ext4_group_desc_csum_set(sb, group, gdp); |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 786 | } |
Aneesh Kumar K.V | 955ce5f | 2009-05-02 20:35:09 -0400 | [diff] [blame] | 787 | ext4_unlock_group(sb, group); |
Theodore Ts'o | aeb1e5d6 | 2012-11-29 21:21:22 -0500 | [diff] [blame] | 788 | brelse(block_bitmap_bh); |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 789 | |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 790 | if (err) |
| 791 | goto fail; |
| 792 | } |
Theodore Ts'o | 119c0d4 | 2012-02-06 20:12:03 -0500 | [diff] [blame] | 793 | |
Theodore Ts'o | 119c0d4 | 2012-02-06 20:12:03 -0500 | [diff] [blame] | 794 | BUFFER_TRACE(group_desc_bh, "get_write_access"); |
| 795 | err = ext4_journal_get_write_access(handle, group_desc_bh); |
| 796 | if (err) |
| 797 | goto fail; |
| 798 | |
| 799 | /* Update the relevant bg descriptor fields */ |
Darrick J. Wong | 41a246d | 2012-04-29 18:33:10 -0400 | [diff] [blame] | 800 | if (ext4_has_group_desc_csum(sb)) { |
Theodore Ts'o | 119c0d4 | 2012-02-06 20:12:03 -0500 | [diff] [blame] | 801 | int free; |
| 802 | struct ext4_group_info *grp = ext4_get_group_info(sb, group); |
| 803 | |
| 804 | down_read(&grp->alloc_sem); /* protect vs itable lazyinit */ |
| 805 | ext4_lock_group(sb, group); /* while we modify the bg desc */ |
| 806 | free = EXT4_INODES_PER_GROUP(sb) - |
| 807 | ext4_itable_unused_count(sb, gdp); |
| 808 | if (gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) { |
| 809 | gdp->bg_flags &= cpu_to_le16(~EXT4_BG_INODE_UNINIT); |
| 810 | free = 0; |
| 811 | } |
| 812 | /* |
| 813 | * Check the relative inode number against the last used |
| 814 | * relative inode number in this group. if it is greater |
| 815 | * we need to update the bg_itable_unused count |
| 816 | */ |
| 817 | if (ino > free) |
| 818 | ext4_itable_unused_set(sb, gdp, |
| 819 | (EXT4_INODES_PER_GROUP(sb) - ino)); |
| 820 | up_read(&grp->alloc_sem); |
Tao Ma | 6f2e9f0 | 2012-05-28 18:20:59 -0400 | [diff] [blame] | 821 | } else { |
| 822 | ext4_lock_group(sb, group); |
Theodore Ts'o | 119c0d4 | 2012-02-06 20:12:03 -0500 | [diff] [blame] | 823 | } |
Tao Ma | 6f2e9f0 | 2012-05-28 18:20:59 -0400 | [diff] [blame] | 824 | |
Theodore Ts'o | 119c0d4 | 2012-02-06 20:12:03 -0500 | [diff] [blame] | 825 | ext4_free_inodes_set(sb, gdp, ext4_free_inodes_count(sb, gdp) - 1); |
| 826 | if (S_ISDIR(mode)) { |
| 827 | ext4_used_dirs_set(sb, gdp, ext4_used_dirs_count(sb, gdp) + 1); |
| 828 | if (sbi->s_log_groups_per_flex) { |
| 829 | ext4_group_t f = ext4_flex_group(sbi, group); |
| 830 | |
| 831 | atomic_inc(&sbi->s_flex_groups[f].used_dirs); |
| 832 | } |
| 833 | } |
Darrick J. Wong | 41a246d | 2012-04-29 18:33:10 -0400 | [diff] [blame] | 834 | if (ext4_has_group_desc_csum(sb)) { |
| 835 | ext4_inode_bitmap_csum_set(sb, group, gdp, inode_bitmap_bh, |
| 836 | EXT4_INODES_PER_GROUP(sb) / 8); |
Darrick J. Wong | feb0ab3 | 2012-04-29 18:45:10 -0400 | [diff] [blame] | 837 | ext4_group_desc_csum_set(sb, group, gdp); |
Theodore Ts'o | 119c0d4 | 2012-02-06 20:12:03 -0500 | [diff] [blame] | 838 | } |
Tao Ma | 6f2e9f0 | 2012-05-28 18:20:59 -0400 | [diff] [blame] | 839 | ext4_unlock_group(sb, group); |
Theodore Ts'o | 119c0d4 | 2012-02-06 20:12:03 -0500 | [diff] [blame] | 840 | |
Aneesh Kumar K.V | 3300bed | 2009-01-03 22:33:39 -0500 | [diff] [blame] | 841 | BUFFER_TRACE(group_desc_bh, "call ext4_handle_dirty_metadata"); |
| 842 | err = ext4_handle_dirty_metadata(handle, NULL, group_desc_bh); |
Aneesh Kumar K.V | 3934186 | 2009-01-05 21:38:14 -0500 | [diff] [blame] | 843 | if (err) |
| 844 | goto fail; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 845 | |
| 846 | percpu_counter_dec(&sbi->s_freeinodes_counter); |
| 847 | if (S_ISDIR(mode)) |
| 848 | percpu_counter_inc(&sbi->s_dirs_counter); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 849 | |
Jose R. Santos | 772cb7c | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 850 | if (sbi->s_log_groups_per_flex) { |
| 851 | flex_group = ext4_flex_group(sbi, group); |
Theodore Ts'o | 9f24e42 | 2009-03-04 19:09:10 -0500 | [diff] [blame] | 852 | atomic_dec(&sbi->s_flex_groups[flex_group].free_inodes); |
Jose R. Santos | 772cb7c | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 853 | } |
Dmitry Monakhov | 5cb81da | 2011-10-29 09:05:00 -0400 | [diff] [blame] | 854 | if (owner) { |
| 855 | inode->i_mode = mode; |
Eric W. Biederman | 08cefc7 | 2012-02-07 15:41:49 -0800 | [diff] [blame] | 856 | i_uid_write(inode, owner[0]); |
| 857 | i_gid_write(inode, owner[1]); |
Dmitry Monakhov | 5cb81da | 2011-10-29 09:05:00 -0400 | [diff] [blame] | 858 | } else if (test_opt(sb, GRPID)) { |
Dmitry Monakhov | b10b852 | 2010-03-04 17:31:51 +0300 | [diff] [blame] | 859 | inode->i_mode = mode; |
| 860 | inode->i_uid = current_fsuid(); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 861 | inode->i_gid = dir->i_gid; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 862 | } else |
Dmitry Monakhov | b10b852 | 2010-03-04 17:31:51 +0300 | [diff] [blame] | 863 | inode_init_owner(inode, dir, mode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 864 | |
Andreas Dilger | 717d50e | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 865 | inode->i_ino = ino + group * EXT4_INODES_PER_GROUP(sb); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 866 | /* This is the optimal IO size (for stat), not the fs block size */ |
| 867 | inode->i_blocks = 0; |
Kalpak Shah | ef7f383 | 2007-07-18 09:15:20 -0400 | [diff] [blame] | 868 | inode->i_mtime = inode->i_atime = inode->i_ctime = ei->i_crtime = |
| 869 | ext4_current_time(inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 870 | |
| 871 | memset(ei->i_data, 0, sizeof(ei->i_data)); |
| 872 | ei->i_dir_start_lookup = 0; |
| 873 | ei->i_disksize = 0; |
| 874 | |
Eryu Guan | 4af8350 | 2011-10-31 18:21:29 -0400 | [diff] [blame] | 875 | /* Don't inherit extent flag from directory, amongst others. */ |
Duane Griffin | 2dc6b0d | 2009-02-15 18:09:20 -0500 | [diff] [blame] | 876 | ei->i_flags = |
| 877 | ext4_mask_flags(mode, EXT4_I(dir)->i_flags & EXT4_FL_INHERITED); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 878 | ei->i_file_acl = 0; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 879 | ei->i_dtime = 0; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 880 | ei->i_block_group = group; |
Theodore Ts'o | a491212 | 2009-03-12 12:18:34 -0400 | [diff] [blame] | 881 | ei->i_last_alloc_group = ~0; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 882 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 883 | ext4_set_inode_flags(inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 884 | if (IS_DIRSYNC(inode)) |
Frank Mayhar | 0390131 | 2009-01-07 00:06:22 -0500 | [diff] [blame] | 885 | ext4_handle_sync(handle); |
Al Viro | 6b38e84 | 2008-12-30 02:03:31 -0500 | [diff] [blame] | 886 | if (insert_inode_locked(inode) < 0) { |
Jan Kara | acd6ad8 | 2011-12-18 17:37:02 -0500 | [diff] [blame] | 887 | /* |
| 888 | * Likely a bitmap corruption causing inode to be allocated |
| 889 | * twice. |
| 890 | */ |
| 891 | err = -EIO; |
| 892 | goto fail; |
Al Viro | 6b38e84 | 2008-12-30 02:03:31 -0500 | [diff] [blame] | 893 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 894 | spin_lock(&sbi->s_next_gen_lock); |
| 895 | inode->i_generation = sbi->s_next_generation++; |
| 896 | spin_unlock(&sbi->s_next_gen_lock); |
| 897 | |
Darrick J. Wong | 814525f | 2012-04-29 18:31:10 -0400 | [diff] [blame] | 898 | /* Precompute checksum seed for inode metadata */ |
| 899 | if (EXT4_HAS_RO_COMPAT_FEATURE(sb, |
| 900 | EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) { |
| 901 | __u32 csum; |
| 902 | struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
| 903 | __le32 inum = cpu_to_le32(inode->i_ino); |
| 904 | __le32 gen = cpu_to_le32(inode->i_generation); |
| 905 | csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&inum, |
| 906 | sizeof(inum)); |
| 907 | ei->i_csum_seed = ext4_chksum(sbi, csum, (__u8 *)&gen, |
| 908 | sizeof(gen)); |
| 909 | } |
| 910 | |
Theodore Ts'o | 353eb83 | 2011-01-10 12:18:25 -0500 | [diff] [blame] | 911 | ext4_clear_state_flags(ei); /* Only relevant on 32-bit archs */ |
Theodore Ts'o | 19f5fb7 | 2010-01-24 14:34:07 -0500 | [diff] [blame] | 912 | ext4_set_inode_state(inode, EXT4_STATE_NEW); |
Kalpak Shah | ef7f383 | 2007-07-18 09:15:20 -0400 | [diff] [blame] | 913 | |
| 914 | ei->i_extra_isize = EXT4_SB(sb)->s_want_extra_isize; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 915 | |
Tao Ma | f08225d | 2012-12-10 14:06:03 -0500 | [diff] [blame] | 916 | ei->i_inline_off = 0; |
| 917 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_INLINE_DATA)) |
| 918 | ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); |
| 919 | |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 920 | ret = inode; |
Christoph Hellwig | 871a293 | 2010-03-03 09:05:07 -0500 | [diff] [blame] | 921 | dquot_initialize(inode); |
Christoph Hellwig | 63936dd | 2010-03-03 09:05:01 -0500 | [diff] [blame] | 922 | err = dquot_alloc_inode(inode); |
| 923 | if (err) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 924 | goto fail_drop; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 925 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 926 | err = ext4_init_acl(handle, inode, dir); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 927 | if (err) |
| 928 | goto fail_free_drop; |
| 929 | |
Eric Paris | 2a7dba3 | 2011-02-01 11:05:39 -0500 | [diff] [blame] | 930 | err = ext4_init_security(handle, inode, dir, qstr); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 931 | if (err) |
| 932 | goto fail_free_drop; |
| 933 | |
Theodore Ts'o | 83982b6 | 2009-01-06 14:53:16 -0500 | [diff] [blame] | 934 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) { |
Eric Sandeen | e4079a1 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 935 | /* set extent flag only for directory, file and normal symlink*/ |
Aneesh Kumar K.V | e65187e | 2008-04-29 08:11:12 -0400 | [diff] [blame] | 936 | if (S_ISDIR(mode) || S_ISREG(mode) || S_ISLNK(mode)) { |
Dmitry Monakhov | 12e9b89 | 2010-05-16 22:00:00 -0400 | [diff] [blame] | 937 | ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS); |
Aneesh Kumar K.V | 42bf038 | 2008-02-25 16:38:03 -0500 | [diff] [blame] | 938 | ext4_ext_tree_init(handle, inode); |
Aneesh Kumar K.V | 42bf038 | 2008-02-25 16:38:03 -0500 | [diff] [blame] | 939 | } |
Alex Tomas | a86c618 | 2006-10-11 01:21:03 -0700 | [diff] [blame] | 940 | } |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 941 | |
Theodore Ts'o | 688f869 | 2011-03-16 17:16:31 -0400 | [diff] [blame] | 942 | if (ext4_handle_valid(handle)) { |
| 943 | ei->i_sync_tid = handle->h_transaction->t_tid; |
| 944 | ei->i_datasync_tid = handle->h_transaction->t_tid; |
| 945 | } |
| 946 | |
Aneesh Kumar K.V | 8753e88 | 2008-04-29 22:00:36 -0400 | [diff] [blame] | 947 | err = ext4_mark_inode_dirty(handle, inode); |
| 948 | if (err) { |
| 949 | ext4_std_error(sb, err); |
| 950 | goto fail_free_drop; |
| 951 | } |
| 952 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 953 | ext4_debug("allocating inode %lu\n", inode->i_ino); |
Theodore Ts'o | 9bffad1 | 2009-06-17 11:48:11 -0400 | [diff] [blame] | 954 | trace_ext4_allocate_inode(inode, dir, mode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 955 | goto really_out; |
| 956 | fail: |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 957 | ext4_std_error(sb, err); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 958 | out: |
| 959 | iput(inode); |
| 960 | ret = ERR_PTR(err); |
| 961 | really_out: |
Aneesh Kumar K.V | 3300bed | 2009-01-03 22:33:39 -0500 | [diff] [blame] | 962 | brelse(inode_bitmap_bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 963 | return ret; |
| 964 | |
| 965 | fail_free_drop: |
Christoph Hellwig | 63936dd | 2010-03-03 09:05:01 -0500 | [diff] [blame] | 966 | dquot_free_inode(inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 967 | |
| 968 | fail_drop: |
Christoph Hellwig | 9f75475 | 2010-03-03 09:05:05 -0500 | [diff] [blame] | 969 | dquot_drop(inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 970 | inode->i_flags |= S_NOQUOTA; |
Miklos Szeredi | 6d6b77f | 2011-10-28 14:13:28 +0200 | [diff] [blame] | 971 | clear_nlink(inode); |
Al Viro | 6b38e84 | 2008-12-30 02:03:31 -0500 | [diff] [blame] | 972 | unlock_new_inode(inode); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 973 | iput(inode); |
Aneesh Kumar K.V | 3300bed | 2009-01-03 22:33:39 -0500 | [diff] [blame] | 974 | brelse(inode_bitmap_bh); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 975 | return ERR_PTR(err); |
| 976 | } |
| 977 | |
| 978 | /* Verify that we are loading a valid orphan from disk */ |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 979 | struct inode *ext4_orphan_get(struct super_block *sb, unsigned long ino) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 980 | { |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 981 | unsigned long max_ino = le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count); |
Avantika Mathur | fd2d429 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 982 | ext4_group_t block_group; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 983 | int bit; |
David Howells | 1d1fe1e | 2008-02-07 00:15:37 -0800 | [diff] [blame] | 984 | struct buffer_head *bitmap_bh; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 985 | struct inode *inode = NULL; |
David Howells | 1d1fe1e | 2008-02-07 00:15:37 -0800 | [diff] [blame] | 986 | long err = -EIO; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 987 | |
| 988 | /* Error cases - e2fsck has already cleaned up for us */ |
| 989 | if (ino > max_ino) { |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 990 | ext4_warning(sb, "bad orphan ino %lu! e2fsck was run?", ino); |
David Howells | 1d1fe1e | 2008-02-07 00:15:37 -0800 | [diff] [blame] | 991 | goto error; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 992 | } |
| 993 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 994 | block_group = (ino - 1) / EXT4_INODES_PER_GROUP(sb); |
| 995 | bit = (ino - 1) % EXT4_INODES_PER_GROUP(sb); |
Eric Sandeen | e29d1cd | 2008-08-02 21:21:02 -0400 | [diff] [blame] | 996 | bitmap_bh = ext4_read_inode_bitmap(sb, block_group); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 997 | if (!bitmap_bh) { |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 998 | ext4_warning(sb, "inode bitmap error for orphan %lu", ino); |
David Howells | 1d1fe1e | 2008-02-07 00:15:37 -0800 | [diff] [blame] | 999 | goto error; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1000 | } |
| 1001 | |
| 1002 | /* Having the inode bit set should be a 100% indicator that this |
| 1003 | * is a valid orphan (no e2fsck run on fs). Orphans also include |
| 1004 | * inodes that were being truncated, so we can't check i_nlink==0. |
| 1005 | */ |
David Howells | 1d1fe1e | 2008-02-07 00:15:37 -0800 | [diff] [blame] | 1006 | if (!ext4_test_bit(bit, bitmap_bh->b_data)) |
| 1007 | goto bad_orphan; |
| 1008 | |
| 1009 | inode = ext4_iget(sb, ino); |
| 1010 | if (IS_ERR(inode)) |
| 1011 | goto iget_failed; |
| 1012 | |
Duane Griffin | 91ef4ca | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 1013 | /* |
| 1014 | * If the orphans has i_nlinks > 0 then it should be able to be |
| 1015 | * truncated, otherwise it won't be removed from the orphan list |
| 1016 | * during processing and an infinite loop will result. |
| 1017 | */ |
| 1018 | if (inode->i_nlink && !ext4_can_truncate(inode)) |
| 1019 | goto bad_orphan; |
| 1020 | |
David Howells | 1d1fe1e | 2008-02-07 00:15:37 -0800 | [diff] [blame] | 1021 | if (NEXT_ORPHAN(inode) > max_ino) |
| 1022 | goto bad_orphan; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1023 | brelse(bitmap_bh); |
| 1024 | return inode; |
David Howells | 1d1fe1e | 2008-02-07 00:15:37 -0800 | [diff] [blame] | 1025 | |
| 1026 | iget_failed: |
| 1027 | err = PTR_ERR(inode); |
| 1028 | inode = NULL; |
| 1029 | bad_orphan: |
Eric Sandeen | 12062dd | 2010-02-15 14:19:27 -0500 | [diff] [blame] | 1030 | ext4_warning(sb, "bad orphan inode %lu! e2fsck was run?", ino); |
Theodore Ts'o | 8de5c32 | 2013-02-14 15:11:41 -0500 | [diff] [blame] | 1031 | printk(KERN_WARNING "ext4_test_bit(bit=%d, block=%llu) = %d\n", |
David Howells | 1d1fe1e | 2008-02-07 00:15:37 -0800 | [diff] [blame] | 1032 | bit, (unsigned long long)bitmap_bh->b_blocknr, |
| 1033 | ext4_test_bit(bit, bitmap_bh->b_data)); |
Theodore Ts'o | 8de5c32 | 2013-02-14 15:11:41 -0500 | [diff] [blame] | 1034 | printk(KERN_WARNING "inode=%p\n", inode); |
David Howells | 1d1fe1e | 2008-02-07 00:15:37 -0800 | [diff] [blame] | 1035 | if (inode) { |
Theodore Ts'o | 8de5c32 | 2013-02-14 15:11:41 -0500 | [diff] [blame] | 1036 | printk(KERN_WARNING "is_bad_inode(inode)=%d\n", |
David Howells | 1d1fe1e | 2008-02-07 00:15:37 -0800 | [diff] [blame] | 1037 | is_bad_inode(inode)); |
Theodore Ts'o | 8de5c32 | 2013-02-14 15:11:41 -0500 | [diff] [blame] | 1038 | printk(KERN_WARNING "NEXT_ORPHAN(inode)=%u\n", |
David Howells | 1d1fe1e | 2008-02-07 00:15:37 -0800 | [diff] [blame] | 1039 | NEXT_ORPHAN(inode)); |
Theodore Ts'o | 8de5c32 | 2013-02-14 15:11:41 -0500 | [diff] [blame] | 1040 | printk(KERN_WARNING "max_ino=%lu\n", max_ino); |
| 1041 | printk(KERN_WARNING "i_nlink=%u\n", inode->i_nlink); |
David Howells | 1d1fe1e | 2008-02-07 00:15:37 -0800 | [diff] [blame] | 1042 | /* Avoid freeing blocks if we got a bad deleted inode */ |
| 1043 | if (inode->i_nlink == 0) |
| 1044 | inode->i_blocks = 0; |
| 1045 | iput(inode); |
| 1046 | } |
| 1047 | brelse(bitmap_bh); |
| 1048 | error: |
| 1049 | return ERR_PTR(err); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1050 | } |
| 1051 | |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1052 | unsigned long ext4_count_free_inodes(struct super_block *sb) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1053 | { |
| 1054 | unsigned long desc_count; |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1055 | struct ext4_group_desc *gdp; |
Theodore Ts'o | 8df9675 | 2009-05-01 08:50:38 -0400 | [diff] [blame] | 1056 | ext4_group_t i, ngroups = ext4_get_groups_count(sb); |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1057 | #ifdef EXT4FS_DEBUG |
| 1058 | struct ext4_super_block *es; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1059 | unsigned long bitmap_count, x; |
| 1060 | struct buffer_head *bitmap_bh = NULL; |
| 1061 | |
Mingming Cao | 617ba13 | 2006-10-11 01:20:53 -0700 | [diff] [blame] | 1062 | es = EXT4_SB(sb)->s_es; |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1063 | desc_count = 0; |
| 1064 | bitmap_count = 0; |
| 1065 | gdp = NULL; |
Theodore Ts'o | 8df9675 | 2009-05-01 08:50:38 -0400 | [diff] [blame] | 1066 | for (i = 0; i < ngroups; i++) { |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1067 | gdp = ext4_get_group_desc(sb, i, NULL); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1068 | if (!gdp) |
| 1069 | continue; |
Aneesh Kumar K.V | 560671a | 2009-01-05 22:20:24 -0500 | [diff] [blame] | 1070 | desc_count += ext4_free_inodes_count(sb, gdp); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1071 | brelse(bitmap_bh); |
Eric Sandeen | e29d1cd | 2008-08-02 21:21:02 -0400 | [diff] [blame] | 1072 | bitmap_bh = ext4_read_inode_bitmap(sb, i); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1073 | if (!bitmap_bh) |
| 1074 | continue; |
| 1075 | |
Theodore Ts'o | f6fb99c | 2012-06-30 19:14:57 -0400 | [diff] [blame] | 1076 | x = ext4_count_free(bitmap_bh->b_data, |
| 1077 | EXT4_INODES_PER_GROUP(sb) / 8); |
Eric Sandeen | c549a95 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1078 | printk(KERN_DEBUG "group %lu: stored = %d, counted = %lu\n", |
Peng Tao | 785b4b3 | 2009-07-27 21:44:40 -0400 | [diff] [blame] | 1079 | (unsigned long) i, ext4_free_inodes_count(sb, gdp), x); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1080 | bitmap_count += x; |
| 1081 | } |
| 1082 | brelse(bitmap_bh); |
Theodore Ts'o | 4776004f | 2008-09-08 23:00:52 -0400 | [diff] [blame] | 1083 | printk(KERN_DEBUG "ext4_count_free_inodes: " |
| 1084 | "stored = %u, computed = %lu, %lu\n", |
| 1085 | le32_to_cpu(es->s_free_inodes_count), desc_count, bitmap_count); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1086 | return desc_count; |
| 1087 | #else |
| 1088 | desc_count = 0; |
Theodore Ts'o | 8df9675 | 2009-05-01 08:50:38 -0400 | [diff] [blame] | 1089 | for (i = 0; i < ngroups; i++) { |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1090 | gdp = ext4_get_group_desc(sb, i, NULL); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1091 | if (!gdp) |
| 1092 | continue; |
Aneesh Kumar K.V | 560671a | 2009-01-05 22:20:24 -0500 | [diff] [blame] | 1093 | desc_count += ext4_free_inodes_count(sb, gdp); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1094 | cond_resched(); |
| 1095 | } |
| 1096 | return desc_count; |
| 1097 | #endif |
| 1098 | } |
| 1099 | |
| 1100 | /* Called at mount-time, super-block is locked */ |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1101 | unsigned long ext4_count_dirs(struct super_block * sb) |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1102 | { |
| 1103 | unsigned long count = 0; |
Theodore Ts'o | 8df9675 | 2009-05-01 08:50:38 -0400 | [diff] [blame] | 1104 | ext4_group_t i, ngroups = ext4_get_groups_count(sb); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1105 | |
Theodore Ts'o | 8df9675 | 2009-05-01 08:50:38 -0400 | [diff] [blame] | 1106 | for (i = 0; i < ngroups; i++) { |
Theodore Ts'o | af5bc92 | 2008-09-08 22:25:24 -0400 | [diff] [blame] | 1107 | struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1108 | if (!gdp) |
| 1109 | continue; |
Aneesh Kumar K.V | 560671a | 2009-01-05 22:20:24 -0500 | [diff] [blame] | 1110 | count += ext4_used_dirs_count(sb, gdp); |
Dave Kleikamp | ac27a0e | 2006-10-11 01:20:50 -0700 | [diff] [blame] | 1111 | } |
| 1112 | return count; |
| 1113 | } |
Lukas Czerner | bfff687 | 2010-10-27 21:30:05 -0400 | [diff] [blame] | 1114 | |
| 1115 | /* |
| 1116 | * Zeroes not yet zeroed inode table - just write zeroes through the whole |
| 1117 | * inode table. Must be called without any spinlock held. The only place |
| 1118 | * where it is called from on active part of filesystem is ext4lazyinit |
| 1119 | * thread, so we do not need any special locks, however we have to prevent |
| 1120 | * inode allocation from the current group, so we take alloc_sem lock, to |
Theodore Ts'o | 119c0d4 | 2012-02-06 20:12:03 -0500 | [diff] [blame] | 1121 | * block ext4_new_inode() until we are finished. |
Lukas Czerner | bfff687 | 2010-10-27 21:30:05 -0400 | [diff] [blame] | 1122 | */ |
H Hartley Sweeten | e0cbee3 | 2011-10-18 10:57:51 -0400 | [diff] [blame] | 1123 | int ext4_init_inode_table(struct super_block *sb, ext4_group_t group, |
Lukas Czerner | bfff687 | 2010-10-27 21:30:05 -0400 | [diff] [blame] | 1124 | int barrier) |
| 1125 | { |
| 1126 | struct ext4_group_info *grp = ext4_get_group_info(sb, group); |
| 1127 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
| 1128 | struct ext4_group_desc *gdp = NULL; |
| 1129 | struct buffer_head *group_desc_bh; |
| 1130 | handle_t *handle; |
| 1131 | ext4_fsblk_t blk; |
| 1132 | int num, ret = 0, used_blks = 0; |
Lukas Czerner | bfff687 | 2010-10-27 21:30:05 -0400 | [diff] [blame] | 1133 | |
| 1134 | /* This should not happen, but just to be sure check this */ |
| 1135 | if (sb->s_flags & MS_RDONLY) { |
| 1136 | ret = 1; |
| 1137 | goto out; |
| 1138 | } |
| 1139 | |
| 1140 | gdp = ext4_get_group_desc(sb, group, &group_desc_bh); |
| 1141 | if (!gdp) |
| 1142 | goto out; |
| 1143 | |
| 1144 | /* |
| 1145 | * We do not need to lock this, because we are the only one |
| 1146 | * handling this flag. |
| 1147 | */ |
| 1148 | if (gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)) |
| 1149 | goto out; |
| 1150 | |
Theodore Ts'o | 9924a92 | 2013-02-08 21:59:22 -0500 | [diff] [blame] | 1151 | handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1); |
Lukas Czerner | bfff687 | 2010-10-27 21:30:05 -0400 | [diff] [blame] | 1152 | if (IS_ERR(handle)) { |
| 1153 | ret = PTR_ERR(handle); |
| 1154 | goto out; |
| 1155 | } |
| 1156 | |
| 1157 | down_write(&grp->alloc_sem); |
| 1158 | /* |
| 1159 | * If inode bitmap was already initialized there may be some |
| 1160 | * used inodes so we need to skip blocks with used inodes in |
| 1161 | * inode table. |
| 1162 | */ |
| 1163 | if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT))) |
| 1164 | used_blks = DIV_ROUND_UP((EXT4_INODES_PER_GROUP(sb) - |
| 1165 | ext4_itable_unused_count(sb, gdp)), |
| 1166 | sbi->s_inodes_per_block); |
| 1167 | |
Lukas Czerner | 857ac88 | 2010-10-27 21:30:05 -0400 | [diff] [blame] | 1168 | if ((used_blks < 0) || (used_blks > sbi->s_itb_per_group)) { |
Theodore Ts'o | 1084f25 | 2012-03-19 23:13:43 -0400 | [diff] [blame] | 1169 | ext4_error(sb, "Something is wrong with group %u: " |
| 1170 | "used itable blocks: %d; " |
| 1171 | "itable unused count: %u", |
Lukas Czerner | 857ac88 | 2010-10-27 21:30:05 -0400 | [diff] [blame] | 1172 | group, used_blks, |
| 1173 | ext4_itable_unused_count(sb, gdp)); |
| 1174 | ret = 1; |
Yongqiang Yang | 33853a0 | 2011-08-01 06:32:19 -0400 | [diff] [blame] | 1175 | goto err_out; |
Lukas Czerner | 857ac88 | 2010-10-27 21:30:05 -0400 | [diff] [blame] | 1176 | } |
| 1177 | |
Lukas Czerner | bfff687 | 2010-10-27 21:30:05 -0400 | [diff] [blame] | 1178 | blk = ext4_inode_table(sb, gdp) + used_blks; |
| 1179 | num = sbi->s_itb_per_group - used_blks; |
| 1180 | |
| 1181 | BUFFER_TRACE(group_desc_bh, "get_write_access"); |
| 1182 | ret = ext4_journal_get_write_access(handle, |
| 1183 | group_desc_bh); |
| 1184 | if (ret) |
| 1185 | goto err_out; |
| 1186 | |
Lukas Czerner | bfff687 | 2010-10-27 21:30:05 -0400 | [diff] [blame] | 1187 | /* |
| 1188 | * Skip zeroout if the inode table is full. But we set the ZEROED |
| 1189 | * flag anyway, because obviously, when it is full it does not need |
| 1190 | * further zeroing. |
| 1191 | */ |
| 1192 | if (unlikely(num == 0)) |
| 1193 | goto skip_zeroout; |
| 1194 | |
| 1195 | ext4_debug("going to zero out inode table in group %d\n", |
| 1196 | group); |
Theodore Ts'o | a107e5a | 2010-10-27 23:44:47 -0400 | [diff] [blame] | 1197 | ret = sb_issue_zeroout(sb, blk, num, GFP_NOFS); |
Lukas Czerner | bfff687 | 2010-10-27 21:30:05 -0400 | [diff] [blame] | 1198 | if (ret < 0) |
| 1199 | goto err_out; |
Theodore Ts'o | a107e5a | 2010-10-27 23:44:47 -0400 | [diff] [blame] | 1200 | if (barrier) |
| 1201 | blkdev_issue_flush(sb->s_bdev, GFP_NOFS, NULL); |
Lukas Czerner | bfff687 | 2010-10-27 21:30:05 -0400 | [diff] [blame] | 1202 | |
| 1203 | skip_zeroout: |
| 1204 | ext4_lock_group(sb, group); |
| 1205 | gdp->bg_flags |= cpu_to_le16(EXT4_BG_INODE_ZEROED); |
Darrick J. Wong | feb0ab3 | 2012-04-29 18:45:10 -0400 | [diff] [blame] | 1206 | ext4_group_desc_csum_set(sb, group, gdp); |
Lukas Czerner | bfff687 | 2010-10-27 21:30:05 -0400 | [diff] [blame] | 1207 | ext4_unlock_group(sb, group); |
| 1208 | |
| 1209 | BUFFER_TRACE(group_desc_bh, |
| 1210 | "call ext4_handle_dirty_metadata"); |
| 1211 | ret = ext4_handle_dirty_metadata(handle, NULL, |
| 1212 | group_desc_bh); |
| 1213 | |
| 1214 | err_out: |
| 1215 | up_write(&grp->alloc_sem); |
| 1216 | ext4_journal_stop(handle); |
| 1217 | out: |
| 1218 | return ret; |
| 1219 | } |