indirect.c (dae1e52cb1267bf8f52e5e47a80fab566d7e8aa4) indirect.c (f86186b44b4164600cce03d0d93ad48ec21fa429)
1/*
2 * linux/fs/ext4/indirect.c
3 *
4 * from
5 *
6 * linux/fs/ext4/inode.c
7 *
8 * Copyright (C) 1992, 1993, 1994, 1995

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202 *
203 * Caller must make sure that @ind is valid and will stay that way.
204 */
205static ext4_fsblk_t ext4_find_near(struct inode *inode, Indirect *ind)
206{
207 struct ext4_inode_info *ei = EXT4_I(inode);
208 __le32 *start = ind->bh ? (__le32 *) ind->bh->b_data : ei->i_data;
209 __le32 *p;
1/*
2 * linux/fs/ext4/indirect.c
3 *
4 * from
5 *
6 * linux/fs/ext4/inode.c
7 *
8 * Copyright (C) 1992, 1993, 1994, 1995

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202 *
203 * Caller must make sure that @ind is valid and will stay that way.
204 */
205static ext4_fsblk_t ext4_find_near(struct inode *inode, Indirect *ind)
206{
207 struct ext4_inode_info *ei = EXT4_I(inode);
208 __le32 *start = ind->bh ? (__le32 *) ind->bh->b_data : ei->i_data;
209 __le32 *p;
210 ext4_fsblk_t bg_start;
211 ext4_fsblk_t last_block;
212 ext4_grpblk_t colour;
213 ext4_group_t block_group;
214 int flex_size = ext4_flex_bg_size(EXT4_SB(inode->i_sb));
215
216 /* Try to find previous block */
217 for (p = ind->p - 1; p >= start; p--) {
218 if (*p)
219 return le32_to_cpu(*p);
220 }
221
222 /* No such thing, so let's try location of indirect block */
223 if (ind->bh)
224 return ind->bh->b_blocknr;
225
226 /*
227 * It is going to be referred to from the inode itself? OK, just put it
228 * into the same cylinder group then.
229 */
210
211 /* Try to find previous block */
212 for (p = ind->p - 1; p >= start; p--) {
213 if (*p)
214 return le32_to_cpu(*p);
215 }
216
217 /* No such thing, so let's try location of indirect block */
218 if (ind->bh)
219 return ind->bh->b_blocknr;
220
221 /*
222 * It is going to be referred to from the inode itself? OK, just put it
223 * into the same cylinder group then.
224 */
230 block_group = ei->i_block_group;
231 if (flex_size >= EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME) {
232 block_group &= ~(flex_size-1);
233 if (S_ISREG(inode->i_mode))
234 block_group++;
235 }
236 bg_start = ext4_group_first_block_no(inode->i_sb, block_group);
237 last_block = ext4_blocks_count(EXT4_SB(inode->i_sb)->s_es) - 1;
238
239 /*
240 * If we are doing delayed allocation, we don't need take
241 * colour into account.
242 */
243 if (test_opt(inode->i_sb, DELALLOC))
244 return bg_start;
245
246 if (bg_start + EXT4_BLOCKS_PER_GROUP(inode->i_sb) <= last_block)
247 colour = (current->pid % 16) *
248 (EXT4_BLOCKS_PER_GROUP(inode->i_sb) / 16);
249 else
250 colour = (current->pid % 16) * ((last_block - bg_start) / 16);
251 return bg_start + colour;
225 return ext4_inode_to_goal_block(inode);
252}
253
254/**
255 * ext4_find_goal - find a preferred place for allocation.
256 * @inode: owner
257 * @block: block we want
258 * @partial: pointer to the last triple within a chain
259 *

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227
228/**
229 * ext4_find_goal - find a preferred place for allocation.
230 * @inode: owner
231 * @block: block we want
232 * @partial: pointer to the last triple within a chain
233 *

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