Blame view
fs/ext4/block_validity.c
6.07 KB
6fd058f77 ext4: Add a compr... |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 |
/* * linux/fs/ext4/block_validity.c * * Copyright (C) 2009 * Theodore Ts'o (tytso@mit.edu) * * Track which blocks in the filesystem are metadata blocks that * should never be used as data blocks by files or directories. */ #include <linux/time.h> #include <linux/fs.h> #include <linux/namei.h> #include <linux/quotaops.h> #include <linux/buffer_head.h> |
6fd058f77 ext4: Add a compr... |
16 17 |
#include <linux/swap.h> #include <linux/pagemap.h> |
6fd058f77 ext4: Add a compr... |
18 |
#include <linux/blkdev.h> |
5a0e3ad6a include cleanup: ... |
19 |
#include <linux/slab.h> |
6fd058f77 ext4: Add a compr... |
20 21 22 23 24 25 26 27 28 |
#include "ext4.h" struct ext4_system_zone { struct rb_node node; ext4_fsblk_t start_blk; unsigned int count; }; static struct kmem_cache *ext4_system_zone_cachep; |
5dabfc78d ext4: rename {exi... |
29 |
int __init ext4_init_system_zone(void) |
6fd058f77 ext4: Add a compr... |
30 |
{ |
16828088f ext4: use KMEM_CA... |
31 |
ext4_system_zone_cachep = KMEM_CACHE(ext4_system_zone, 0); |
6fd058f77 ext4: Add a compr... |
32 33 34 35 |
if (ext4_system_zone_cachep == NULL) return -ENOMEM; return 0; } |
5dabfc78d ext4: rename {exi... |
36 |
void ext4_exit_system_zone(void) |
6fd058f77 ext4: Add a compr... |
37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 |
{ kmem_cache_destroy(ext4_system_zone_cachep); } static inline int can_merge(struct ext4_system_zone *entry1, struct ext4_system_zone *entry2) { if ((entry1->start_blk + entry1->count) == entry2->start_blk) return 1; return 0; } /* * Mark a range of blocks as belonging to the "system zone" --- that * is, filesystem metadata blocks which should never be used by * inodes. */ static int add_system_zone(struct ext4_sb_info *sbi, ext4_fsblk_t start_blk, unsigned int count) { struct ext4_system_zone *new_entry = NULL, *entry; struct rb_node **n = &sbi->system_blks.rb_node, *node; struct rb_node *parent = NULL, *new_node = NULL; while (*n) { parent = *n; entry = rb_entry(parent, struct ext4_system_zone, node); if (start_blk < entry->start_blk) n = &(*n)->rb_left; else if (start_blk >= (entry->start_blk + entry->count)) n = &(*n)->rb_right; else { |
60e6679e2 ext4: Drop whites... |
70 |
if (start_blk + count > (entry->start_blk + |
6fd058f77 ext4: Add a compr... |
71 |
entry->count)) |
60e6679e2 ext4: Drop whites... |
72 |
entry->count = (start_blk + count - |
6fd058f77 ext4: Add a compr... |
73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 |
entry->start_blk); new_node = *n; new_entry = rb_entry(new_node, struct ext4_system_zone, node); break; } } if (!new_entry) { new_entry = kmem_cache_alloc(ext4_system_zone_cachep, GFP_KERNEL); if (!new_entry) return -ENOMEM; new_entry->start_blk = start_blk; new_entry->count = count; new_node = &new_entry->node; rb_link_node(new_node, parent, n); rb_insert_color(new_node, &sbi->system_blks); } /* Can we merge to the left? */ node = rb_prev(new_node); if (node) { entry = rb_entry(node, struct ext4_system_zone, node); if (can_merge(entry, new_entry)) { new_entry->start_blk = entry->start_blk; new_entry->count += entry->count; rb_erase(node, &sbi->system_blks); kmem_cache_free(ext4_system_zone_cachep, entry); } } /* Can we merge to the right? */ node = rb_next(new_node); if (node) { entry = rb_entry(node, struct ext4_system_zone, node); if (can_merge(new_entry, entry)) { new_entry->count += entry->count; rb_erase(node, &sbi->system_blks); kmem_cache_free(ext4_system_zone_cachep, entry); } } return 0; } static void debug_print_tree(struct ext4_sb_info *sbi) { struct rb_node *node; struct ext4_system_zone *entry; int first = 1; printk(KERN_INFO "System zones: "); node = rb_first(&sbi->system_blks); while (node) { entry = rb_entry(node, struct ext4_system_zone, node); |
d74f3d252 ext4: add missing... |
129 |
printk(KERN_CONT "%s%llu-%llu", first ? "" : ", ", |
6fd058f77 ext4: Add a compr... |
130 131 132 133 |
entry->start_blk, entry->start_blk + entry->count - 1); first = 0; node = rb_next(node); } |
d74f3d252 ext4: add missing... |
134 135 |
printk(KERN_CONT " "); |
6fd058f77 ext4: Add a compr... |
136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 |
} int ext4_setup_system_zone(struct super_block *sb) { ext4_group_t ngroups = ext4_get_groups_count(sb); struct ext4_sb_info *sbi = EXT4_SB(sb); struct ext4_group_desc *gdp; ext4_group_t i; int flex_size = ext4_flex_bg_size(sbi); int ret; if (!test_opt(sb, BLOCK_VALIDITY)) { if (EXT4_SB(sb)->system_blks.rb_node) ext4_release_system_zone(sb); return 0; } if (EXT4_SB(sb)->system_blks.rb_node) return 0; for (i=0; i < ngroups; i++) { if (ext4_bg_has_super(sb, i) && ((i < 5) || ((i % flex_size) == 0))) add_system_zone(sbi, ext4_group_first_block_no(sb, i), |
1032988c7 ext4: fix block v... |
159 |
ext4_bg_num_gdb(sb, i) + 1); |
6fd058f77 ext4: Add a compr... |
160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 |
gdp = ext4_get_group_desc(sb, i, NULL); ret = add_system_zone(sbi, ext4_block_bitmap(sb, gdp), 1); if (ret) return ret; ret = add_system_zone(sbi, ext4_inode_bitmap(sb, gdp), 1); if (ret) return ret; ret = add_system_zone(sbi, ext4_inode_table(sb, gdp), sbi->s_itb_per_group); if (ret) return ret; } if (test_opt(sb, DEBUG)) debug_print_tree(EXT4_SB(sb)); return 0; } /* Called when the filesystem is unmounted */ void ext4_release_system_zone(struct super_block *sb) { |
d1866bd06 fs/ext4: use rbtr... |
181 182 183 184 |
struct ext4_system_zone *entry, *n; rbtree_postorder_for_each_entry_safe(entry, n, &EXT4_SB(sb)->system_blks, node) |
6fd058f77 ext4: Add a compr... |
185 |
kmem_cache_free(ext4_system_zone_cachep, entry); |
d1866bd06 fs/ext4: use rbtr... |
186 |
|
64e290ec6 ext4: fix up rb_r... |
187 |
EXT4_SB(sb)->system_blks = RB_ROOT; |
6fd058f77 ext4: Add a compr... |
188 189 190 191 192 193 194 195 196 197 198 199 200 201 |
} /* * Returns 1 if the passed-in block region (start_blk, * start_blk+count) is valid; 0 if some part of the block region * overlaps with filesystem metadata blocks. */ int ext4_data_block_valid(struct ext4_sb_info *sbi, ext4_fsblk_t start_blk, unsigned int count) { struct ext4_system_zone *entry; struct rb_node *n = sbi->system_blks.rb_node; if ((start_blk <= le32_to_cpu(sbi->s_es->s_first_data_block)) || |
1585d8d89 ext4: add check f... |
202 |
(start_blk + count < start_blk) || |
1c13d5c08 ext4: Save error ... |
203 204 |
(start_blk + count > ext4_blocks_count(sbi->s_es))) { sbi->s_es->s_last_error_block = cpu_to_le64(start_blk); |
6fd058f77 ext4: Add a compr... |
205 |
return 0; |
1c13d5c08 ext4: Save error ... |
206 |
} |
6fd058f77 ext4: Add a compr... |
207 208 209 210 211 212 |
while (n) { entry = rb_entry(n, struct ext4_system_zone, node); if (start_blk + count - 1 < entry->start_blk) n = n->rb_left; else if (start_blk >= (entry->start_blk + entry->count)) n = n->rb_right; |
1c13d5c08 ext4: Save error ... |
213 214 |
else { sbi->s_es->s_last_error_block = cpu_to_le64(start_blk); |
6fd058f77 ext4: Add a compr... |
215 |
return 0; |
1c13d5c08 ext4: Save error ... |
216 |
} |
6fd058f77 ext4: Add a compr... |
217 218 219 |
} return 1; } |
1f7d1e774 ext4: move __ext4... |
220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 |
int ext4_check_blockref(const char *function, unsigned int line, struct inode *inode, __le32 *p, unsigned int max) { struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es; __le32 *bref = p; unsigned int blk; while (bref < p+max) { blk = le32_to_cpu(*bref++); if (blk && unlikely(!ext4_data_block_valid(EXT4_SB(inode->i_sb), blk, 1))) { es->s_last_error_block = cpu_to_le64(blk); ext4_error_inode(inode, function, line, blk, "invalid block"); |
6a797d273 ext4: call out CR... |
235 |
return -EFSCORRUPTED; |
1f7d1e774 ext4: move __ext4... |
236 237 238 239 |
} } return 0; } |
dae1e52cb ext4: move ext4_i... |
240 |