1748de673SAkira Fujita /* 2748de673SAkira Fujita * Copyright (c) 2008,2009 NEC Software Tohoku, Ltd. 3748de673SAkira Fujita * Written by Takashi Sato <t-sato@yk.jp.nec.com> 4748de673SAkira Fujita * Akira Fujita <a-fujita@rs.jp.nec.com> 5748de673SAkira Fujita * 6748de673SAkira Fujita * This program is free software; you can redistribute it and/or modify it 7748de673SAkira Fujita * under the terms of version 2.1 of the GNU Lesser General Public License 8748de673SAkira Fujita * as published by the Free Software Foundation. 9748de673SAkira Fujita * 10748de673SAkira Fujita * This program is distributed in the hope that it will be useful, 11748de673SAkira Fujita * but WITHOUT ANY WARRANTY; without even the implied warranty of 12748de673SAkira Fujita * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13748de673SAkira Fujita * GNU General Public License for more details. 14748de673SAkira Fujita */ 15748de673SAkira Fujita 16748de673SAkira Fujita #include <linux/fs.h> 17748de673SAkira Fujita #include <linux/quotaops.h> 18748de673SAkira Fujita #include "ext4_jbd2.h" 19748de673SAkira Fujita #include "ext4_extents.h" 20748de673SAkira Fujita #include "ext4.h" 21748de673SAkira Fujita 22e8505970SAkira Fujita /** 23e8505970SAkira Fujita * get_ext_path - Find an extent path for designated logical block number. 24e8505970SAkira Fujita * 25e8505970SAkira Fujita * @inode: an inode which is searched 26e8505970SAkira Fujita * @lblock: logical block number to find an extent path 27e8505970SAkira Fujita * @path: pointer to an extent path pointer (for output) 28e8505970SAkira Fujita * 29e8505970SAkira Fujita * ext4_ext_find_extent wrapper. Return 0 on success, or a negative error value 30e8505970SAkira Fujita * on failure. 31e8505970SAkira Fujita */ 32e8505970SAkira Fujita static inline int 33e8505970SAkira Fujita get_ext_path(struct inode *inode, ext4_lblk_t lblock, 34e8505970SAkira Fujita struct ext4_ext_path **path) 35e8505970SAkira Fujita { 36e8505970SAkira Fujita int ret = 0; 37e8505970SAkira Fujita 38e8505970SAkira Fujita *path = ext4_ext_find_extent(inode, lblock, *path); 39e8505970SAkira Fujita if (IS_ERR(*path)) { 40e8505970SAkira Fujita ret = PTR_ERR(*path); 41e8505970SAkira Fujita *path = NULL; 42e8505970SAkira Fujita } 43e8505970SAkira Fujita return ret; 44e8505970SAkira Fujita } 45748de673SAkira Fujita 46748de673SAkira Fujita /** 47748de673SAkira Fujita * copy_extent_status - Copy the extent's initialization status 48748de673SAkira Fujita * 49748de673SAkira Fujita * @src: an extent for getting initialize status 50748de673SAkira Fujita * @dest: an extent to be set the status 51748de673SAkira Fujita */ 52748de673SAkira Fujita static void 53748de673SAkira Fujita copy_extent_status(struct ext4_extent *src, struct ext4_extent *dest) 54748de673SAkira Fujita { 55748de673SAkira Fujita if (ext4_ext_is_uninitialized(src)) 56748de673SAkira Fujita ext4_ext_mark_uninitialized(dest); 57748de673SAkira Fujita else 58748de673SAkira Fujita dest->ee_len = cpu_to_le16(ext4_ext_get_actual_len(dest)); 59748de673SAkira Fujita } 60748de673SAkira Fujita 61748de673SAkira Fujita /** 62748de673SAkira Fujita * mext_next_extent - Search for the next extent and set it to "extent" 63748de673SAkira Fujita * 64748de673SAkira Fujita * @inode: inode which is searched 65748de673SAkira Fujita * @path: this will obtain data for the next extent 66748de673SAkira Fujita * @extent: pointer to the next extent we have just gotten 67748de673SAkira Fujita * 68748de673SAkira Fujita * Search the next extent in the array of ext4_ext_path structure (@path) 69748de673SAkira Fujita * and set it to ext4_extent structure (@extent). In addition, the member of 70748de673SAkira Fujita * @path (->p_ext) also points the next extent. Return 0 on success, 1 if 71748de673SAkira Fujita * ext4_ext_path structure refers to the last extent, or a negative error 72748de673SAkira Fujita * value on failure. 73748de673SAkira Fujita */ 74748de673SAkira Fujita static int 75748de673SAkira Fujita mext_next_extent(struct inode *inode, struct ext4_ext_path *path, 76748de673SAkira Fujita struct ext4_extent **extent) 77748de673SAkira Fujita { 78748de673SAkira Fujita int ppos, leaf_ppos = path->p_depth; 79748de673SAkira Fujita 80748de673SAkira Fujita ppos = leaf_ppos; 81748de673SAkira Fujita if (EXT_LAST_EXTENT(path[ppos].p_hdr) > path[ppos].p_ext) { 82748de673SAkira Fujita /* leaf block */ 83748de673SAkira Fujita *extent = ++path[ppos].p_ext; 84748de673SAkira Fujita return 0; 85748de673SAkira Fujita } 86748de673SAkira Fujita 87748de673SAkira Fujita while (--ppos >= 0) { 88748de673SAkira Fujita if (EXT_LAST_INDEX(path[ppos].p_hdr) > 89748de673SAkira Fujita path[ppos].p_idx) { 90748de673SAkira Fujita int cur_ppos = ppos; 91748de673SAkira Fujita 92748de673SAkira Fujita /* index block */ 93748de673SAkira Fujita path[ppos].p_idx++; 94748de673SAkira Fujita path[ppos].p_block = idx_pblock(path[ppos].p_idx); 95748de673SAkira Fujita if (path[ppos+1].p_bh) 96748de673SAkira Fujita brelse(path[ppos+1].p_bh); 97748de673SAkira Fujita path[ppos+1].p_bh = 98748de673SAkira Fujita sb_bread(inode->i_sb, path[ppos].p_block); 99748de673SAkira Fujita if (!path[ppos+1].p_bh) 100748de673SAkira Fujita return -EIO; 101748de673SAkira Fujita path[ppos+1].p_hdr = 102748de673SAkira Fujita ext_block_hdr(path[ppos+1].p_bh); 103748de673SAkira Fujita 104748de673SAkira Fujita /* Halfway index block */ 105748de673SAkira Fujita while (++cur_ppos < leaf_ppos) { 106748de673SAkira Fujita path[cur_ppos].p_idx = 107748de673SAkira Fujita EXT_FIRST_INDEX(path[cur_ppos].p_hdr); 108748de673SAkira Fujita path[cur_ppos].p_block = 109748de673SAkira Fujita idx_pblock(path[cur_ppos].p_idx); 110748de673SAkira Fujita if (path[cur_ppos+1].p_bh) 111748de673SAkira Fujita brelse(path[cur_ppos+1].p_bh); 112748de673SAkira Fujita path[cur_ppos+1].p_bh = sb_bread(inode->i_sb, 113748de673SAkira Fujita path[cur_ppos].p_block); 114748de673SAkira Fujita if (!path[cur_ppos+1].p_bh) 115748de673SAkira Fujita return -EIO; 116748de673SAkira Fujita path[cur_ppos+1].p_hdr = 117748de673SAkira Fujita ext_block_hdr(path[cur_ppos+1].p_bh); 118748de673SAkira Fujita } 119748de673SAkira Fujita 120748de673SAkira Fujita /* leaf block */ 121748de673SAkira Fujita path[leaf_ppos].p_ext = *extent = 122748de673SAkira Fujita EXT_FIRST_EXTENT(path[leaf_ppos].p_hdr); 123748de673SAkira Fujita return 0; 124748de673SAkira Fujita } 125748de673SAkira Fujita } 126748de673SAkira Fujita /* We found the last extent */ 127748de673SAkira Fujita return 1; 128748de673SAkira Fujita } 129748de673SAkira Fujita 130748de673SAkira Fujita /** 131748de673SAkira Fujita * mext_double_down_read - Acquire two inodes' read semaphore 132748de673SAkira Fujita * 133748de673SAkira Fujita * @orig_inode: original inode structure 134748de673SAkira Fujita * @donor_inode: donor inode structure 135748de673SAkira Fujita * Acquire read semaphore of the two inodes (orig and donor) by i_ino order. 136748de673SAkira Fujita */ 137748de673SAkira Fujita static void 138748de673SAkira Fujita mext_double_down_read(struct inode *orig_inode, struct inode *donor_inode) 139748de673SAkira Fujita { 140748de673SAkira Fujita struct inode *first = orig_inode, *second = donor_inode; 141748de673SAkira Fujita 142748de673SAkira Fujita BUG_ON(orig_inode == NULL || donor_inode == NULL); 143748de673SAkira Fujita 144748de673SAkira Fujita /* 145748de673SAkira Fujita * Use the inode number to provide the stable locking order instead 146748de673SAkira Fujita * of its address, because the C language doesn't guarantee you can 147748de673SAkira Fujita * compare pointers that don't come from the same array. 148748de673SAkira Fujita */ 149748de673SAkira Fujita if (donor_inode->i_ino < orig_inode->i_ino) { 150748de673SAkira Fujita first = donor_inode; 151748de673SAkira Fujita second = orig_inode; 152748de673SAkira Fujita } 153748de673SAkira Fujita 154748de673SAkira Fujita down_read(&EXT4_I(first)->i_data_sem); 155748de673SAkira Fujita down_read(&EXT4_I(second)->i_data_sem); 156748de673SAkira Fujita } 157748de673SAkira Fujita 158748de673SAkira Fujita /** 159748de673SAkira Fujita * mext_double_down_write - Acquire two inodes' write semaphore 160748de673SAkira Fujita * 161748de673SAkira Fujita * @orig_inode: original inode structure 162748de673SAkira Fujita * @donor_inode: donor inode structure 163748de673SAkira Fujita * Acquire write semaphore of the two inodes (orig and donor) by i_ino order. 164748de673SAkira Fujita */ 165748de673SAkira Fujita static void 166748de673SAkira Fujita mext_double_down_write(struct inode *orig_inode, struct inode *donor_inode) 167748de673SAkira Fujita { 168748de673SAkira Fujita struct inode *first = orig_inode, *second = donor_inode; 169748de673SAkira Fujita 170748de673SAkira Fujita BUG_ON(orig_inode == NULL || donor_inode == NULL); 171748de673SAkira Fujita 172748de673SAkira Fujita /* 173748de673SAkira Fujita * Use the inode number to provide the stable locking order instead 174748de673SAkira Fujita * of its address, because the C language doesn't guarantee you can 175748de673SAkira Fujita * compare pointers that don't come from the same array. 176748de673SAkira Fujita */ 177748de673SAkira Fujita if (donor_inode->i_ino < orig_inode->i_ino) { 178748de673SAkira Fujita first = donor_inode; 179748de673SAkira Fujita second = orig_inode; 180748de673SAkira Fujita } 181748de673SAkira Fujita 182748de673SAkira Fujita down_write(&EXT4_I(first)->i_data_sem); 183748de673SAkira Fujita down_write(&EXT4_I(second)->i_data_sem); 184748de673SAkira Fujita } 185748de673SAkira Fujita 186748de673SAkira Fujita /** 187748de673SAkira Fujita * mext_double_up_read - Release two inodes' read semaphore 188748de673SAkira Fujita * 189748de673SAkira Fujita * @orig_inode: original inode structure to be released its lock first 190748de673SAkira Fujita * @donor_inode: donor inode structure to be released its lock second 191748de673SAkira Fujita * Release read semaphore of two inodes (orig and donor). 192748de673SAkira Fujita */ 193748de673SAkira Fujita static void 194748de673SAkira Fujita mext_double_up_read(struct inode *orig_inode, struct inode *donor_inode) 195748de673SAkira Fujita { 196748de673SAkira Fujita BUG_ON(orig_inode == NULL || donor_inode == NULL); 197748de673SAkira Fujita 198748de673SAkira Fujita up_read(&EXT4_I(orig_inode)->i_data_sem); 199748de673SAkira Fujita up_read(&EXT4_I(donor_inode)->i_data_sem); 200748de673SAkira Fujita } 201748de673SAkira Fujita 202748de673SAkira Fujita /** 203748de673SAkira Fujita * mext_double_up_write - Release two inodes' write semaphore 204748de673SAkira Fujita * 205748de673SAkira Fujita * @orig_inode: original inode structure to be released its lock first 206748de673SAkira Fujita * @donor_inode: donor inode structure to be released its lock second 207748de673SAkira Fujita * Release write semaphore of two inodes (orig and donor). 208748de673SAkira Fujita */ 209748de673SAkira Fujita static void 210748de673SAkira Fujita mext_double_up_write(struct inode *orig_inode, struct inode *donor_inode) 211748de673SAkira Fujita { 212748de673SAkira Fujita BUG_ON(orig_inode == NULL || donor_inode == NULL); 213748de673SAkira Fujita 214748de673SAkira Fujita up_write(&EXT4_I(orig_inode)->i_data_sem); 215748de673SAkira Fujita up_write(&EXT4_I(donor_inode)->i_data_sem); 216748de673SAkira Fujita } 217748de673SAkira Fujita 218748de673SAkira Fujita /** 219748de673SAkira Fujita * mext_insert_across_blocks - Insert extents across leaf block 220748de673SAkira Fujita * 221748de673SAkira Fujita * @handle: journal handle 222748de673SAkira Fujita * @orig_inode: original inode 223748de673SAkira Fujita * @o_start: first original extent to be changed 224748de673SAkira Fujita * @o_end: last original extent to be changed 225748de673SAkira Fujita * @start_ext: first new extent to be inserted 226748de673SAkira Fujita * @new_ext: middle of new extent to be inserted 227748de673SAkira Fujita * @end_ext: last new extent to be inserted 228748de673SAkira Fujita * 229748de673SAkira Fujita * Allocate a new leaf block and insert extents into it. Return 0 on success, 230748de673SAkira Fujita * or a negative error value on failure. 231748de673SAkira Fujita */ 232748de673SAkira Fujita static int 233748de673SAkira Fujita mext_insert_across_blocks(handle_t *handle, struct inode *orig_inode, 234748de673SAkira Fujita struct ext4_extent *o_start, struct ext4_extent *o_end, 235748de673SAkira Fujita struct ext4_extent *start_ext, struct ext4_extent *new_ext, 236748de673SAkira Fujita struct ext4_extent *end_ext) 237748de673SAkira Fujita { 238748de673SAkira Fujita struct ext4_ext_path *orig_path = NULL; 239748de673SAkira Fujita ext4_lblk_t eblock = 0; 240748de673SAkira Fujita int new_flag = 0; 241748de673SAkira Fujita int end_flag = 0; 242748de673SAkira Fujita int err = 0; 243748de673SAkira Fujita 244748de673SAkira Fujita if (start_ext->ee_len && new_ext->ee_len && end_ext->ee_len) { 245748de673SAkira Fujita if (o_start == o_end) { 246748de673SAkira Fujita 247748de673SAkira Fujita /* start_ext new_ext end_ext 248748de673SAkira Fujita * donor |---------|-----------|--------| 249748de673SAkira Fujita * orig |------------------------------| 250748de673SAkira Fujita */ 251748de673SAkira Fujita end_flag = 1; 252748de673SAkira Fujita } else { 253748de673SAkira Fujita 254748de673SAkira Fujita /* start_ext new_ext end_ext 255748de673SAkira Fujita * donor |---------|----------|---------| 256748de673SAkira Fujita * orig |---------------|--------------| 257748de673SAkira Fujita */ 258748de673SAkira Fujita o_end->ee_block = end_ext->ee_block; 259748de673SAkira Fujita o_end->ee_len = end_ext->ee_len; 260748de673SAkira Fujita ext4_ext_store_pblock(o_end, ext_pblock(end_ext)); 261748de673SAkira Fujita } 262748de673SAkira Fujita 263748de673SAkira Fujita o_start->ee_len = start_ext->ee_len; 264748de673SAkira Fujita new_flag = 1; 265748de673SAkira Fujita 266748de673SAkira Fujita } else if (start_ext->ee_len && new_ext->ee_len && 267748de673SAkira Fujita !end_ext->ee_len && o_start == o_end) { 268748de673SAkira Fujita 269748de673SAkira Fujita /* start_ext new_ext 270748de673SAkira Fujita * donor |--------------|---------------| 271748de673SAkira Fujita * orig |------------------------------| 272748de673SAkira Fujita */ 273748de673SAkira Fujita o_start->ee_len = start_ext->ee_len; 274748de673SAkira Fujita new_flag = 1; 275748de673SAkira Fujita 276748de673SAkira Fujita } else if (!start_ext->ee_len && new_ext->ee_len && 277748de673SAkira Fujita end_ext->ee_len && o_start == o_end) { 278748de673SAkira Fujita 279748de673SAkira Fujita /* new_ext end_ext 280748de673SAkira Fujita * donor |--------------|---------------| 281748de673SAkira Fujita * orig |------------------------------| 282748de673SAkira Fujita */ 283748de673SAkira Fujita o_end->ee_block = end_ext->ee_block; 284748de673SAkira Fujita o_end->ee_len = end_ext->ee_len; 285748de673SAkira Fujita ext4_ext_store_pblock(o_end, ext_pblock(end_ext)); 286748de673SAkira Fujita 287748de673SAkira Fujita /* 288748de673SAkira Fujita * Set 0 to the extent block if new_ext was 289748de673SAkira Fujita * the first block. 290748de673SAkira Fujita */ 291748de673SAkira Fujita if (new_ext->ee_block) 292748de673SAkira Fujita eblock = le32_to_cpu(new_ext->ee_block); 293748de673SAkira Fujita 294748de673SAkira Fujita new_flag = 1; 295748de673SAkira Fujita } else { 296748de673SAkira Fujita ext4_debug("ext4 move extent: Unexpected insert case\n"); 297748de673SAkira Fujita return -EIO; 298748de673SAkira Fujita } 299748de673SAkira Fujita 300748de673SAkira Fujita if (new_flag) { 301e8505970SAkira Fujita err = get_ext_path(orig_inode, eblock, &orig_path); 302748de673SAkira Fujita if (orig_path == NULL) 303748de673SAkira Fujita goto out; 304748de673SAkira Fujita 305748de673SAkira Fujita if (ext4_ext_insert_extent(handle, orig_inode, 306748de673SAkira Fujita orig_path, new_ext)) 307748de673SAkira Fujita goto out; 308748de673SAkira Fujita } 309748de673SAkira Fujita 310748de673SAkira Fujita if (end_flag) { 311e8505970SAkira Fujita err = get_ext_path(orig_inode, 312e8505970SAkira Fujita le32_to_cpu(end_ext->ee_block) - 1, &orig_path); 313748de673SAkira Fujita if (orig_path == NULL) 314748de673SAkira Fujita goto out; 315748de673SAkira Fujita 316748de673SAkira Fujita if (ext4_ext_insert_extent(handle, orig_inode, 317748de673SAkira Fujita orig_path, end_ext)) 318748de673SAkira Fujita goto out; 319748de673SAkira Fujita } 320748de673SAkira Fujita out: 321748de673SAkira Fujita if (orig_path) { 322748de673SAkira Fujita ext4_ext_drop_refs(orig_path); 323748de673SAkira Fujita kfree(orig_path); 324748de673SAkira Fujita } 325748de673SAkira Fujita 326748de673SAkira Fujita return err; 327748de673SAkira Fujita 328748de673SAkira Fujita } 329748de673SAkira Fujita 330748de673SAkira Fujita /** 331748de673SAkira Fujita * mext_insert_inside_block - Insert new extent to the extent block 332748de673SAkira Fujita * 333748de673SAkira Fujita * @o_start: first original extent to be moved 334748de673SAkira Fujita * @o_end: last original extent to be moved 335748de673SAkira Fujita * @start_ext: first new extent to be inserted 336748de673SAkira Fujita * @new_ext: middle of new extent to be inserted 337748de673SAkira Fujita * @end_ext: last new extent to be inserted 338748de673SAkira Fujita * @eh: extent header of target leaf block 339748de673SAkira Fujita * @range_to_move: used to decide how to insert extent 340748de673SAkira Fujita * 341748de673SAkira Fujita * Insert extents into the leaf block. The extent (@o_start) is overwritten 342748de673SAkira Fujita * by inserted extents. 343748de673SAkira Fujita */ 344748de673SAkira Fujita static void 345748de673SAkira Fujita mext_insert_inside_block(struct ext4_extent *o_start, 346748de673SAkira Fujita struct ext4_extent *o_end, 347748de673SAkira Fujita struct ext4_extent *start_ext, 348748de673SAkira Fujita struct ext4_extent *new_ext, 349748de673SAkira Fujita struct ext4_extent *end_ext, 350748de673SAkira Fujita struct ext4_extent_header *eh, 351748de673SAkira Fujita int range_to_move) 352748de673SAkira Fujita { 353748de673SAkira Fujita int i = 0; 354748de673SAkira Fujita unsigned long len; 355748de673SAkira Fujita 356748de673SAkira Fujita /* Move the existing extents */ 357748de673SAkira Fujita if (range_to_move && o_end < EXT_LAST_EXTENT(eh)) { 358748de673SAkira Fujita len = (unsigned long)(EXT_LAST_EXTENT(eh) + 1) - 359748de673SAkira Fujita (unsigned long)(o_end + 1); 360748de673SAkira Fujita memmove(o_end + 1 + range_to_move, o_end + 1, len); 361748de673SAkira Fujita } 362748de673SAkira Fujita 363748de673SAkira Fujita /* Insert start entry */ 364748de673SAkira Fujita if (start_ext->ee_len) 365748de673SAkira Fujita o_start[i++].ee_len = start_ext->ee_len; 366748de673SAkira Fujita 367748de673SAkira Fujita /* Insert new entry */ 368748de673SAkira Fujita if (new_ext->ee_len) { 369748de673SAkira Fujita o_start[i] = *new_ext; 370748de673SAkira Fujita ext4_ext_store_pblock(&o_start[i++], ext_pblock(new_ext)); 371748de673SAkira Fujita } 372748de673SAkira Fujita 373748de673SAkira Fujita /* Insert end entry */ 374748de673SAkira Fujita if (end_ext->ee_len) 375748de673SAkira Fujita o_start[i] = *end_ext; 376748de673SAkira Fujita 377748de673SAkira Fujita /* Increment the total entries counter on the extent block */ 378748de673SAkira Fujita le16_add_cpu(&eh->eh_entries, range_to_move); 379748de673SAkira Fujita } 380748de673SAkira Fujita 381748de673SAkira Fujita /** 382748de673SAkira Fujita * mext_insert_extents - Insert new extent 383748de673SAkira Fujita * 384748de673SAkira Fujita * @handle: journal handle 385748de673SAkira Fujita * @orig_inode: original inode 386748de673SAkira Fujita * @orig_path: path indicates first extent to be changed 387748de673SAkira Fujita * @o_start: first original extent to be changed 388748de673SAkira Fujita * @o_end: last original extent to be changed 389748de673SAkira Fujita * @start_ext: first new extent to be inserted 390748de673SAkira Fujita * @new_ext: middle of new extent to be inserted 391748de673SAkira Fujita * @end_ext: last new extent to be inserted 392748de673SAkira Fujita * 393748de673SAkira Fujita * Call the function to insert extents. If we cannot add more extents into 394748de673SAkira Fujita * the leaf block, we call mext_insert_across_blocks() to create a 395748de673SAkira Fujita * new leaf block. Otherwise call mext_insert_inside_block(). Return 0 396748de673SAkira Fujita * on success, or a negative error value on failure. 397748de673SAkira Fujita */ 398748de673SAkira Fujita static int 399748de673SAkira Fujita mext_insert_extents(handle_t *handle, struct inode *orig_inode, 400748de673SAkira Fujita struct ext4_ext_path *orig_path, 401748de673SAkira Fujita struct ext4_extent *o_start, 402748de673SAkira Fujita struct ext4_extent *o_end, 403748de673SAkira Fujita struct ext4_extent *start_ext, 404748de673SAkira Fujita struct ext4_extent *new_ext, 405748de673SAkira Fujita struct ext4_extent *end_ext) 406748de673SAkira Fujita { 407748de673SAkira Fujita struct ext4_extent_header *eh; 408748de673SAkira Fujita unsigned long need_slots, slots_range; 409748de673SAkira Fujita int range_to_move, depth, ret; 410748de673SAkira Fujita 411748de673SAkira Fujita /* 412748de673SAkira Fujita * The extents need to be inserted 413748de673SAkira Fujita * start_extent + new_extent + end_extent. 414748de673SAkira Fujita */ 415748de673SAkira Fujita need_slots = (start_ext->ee_len ? 1 : 0) + (end_ext->ee_len ? 1 : 0) + 416748de673SAkira Fujita (new_ext->ee_len ? 1 : 0); 417748de673SAkira Fujita 418748de673SAkira Fujita /* The number of slots between start and end */ 419748de673SAkira Fujita slots_range = ((unsigned long)(o_end + 1) - (unsigned long)o_start + 1) 420748de673SAkira Fujita / sizeof(struct ext4_extent); 421748de673SAkira Fujita 422748de673SAkira Fujita /* Range to move the end of extent */ 423748de673SAkira Fujita range_to_move = need_slots - slots_range; 424748de673SAkira Fujita depth = orig_path->p_depth; 425748de673SAkira Fujita orig_path += depth; 426748de673SAkira Fujita eh = orig_path->p_hdr; 427748de673SAkira Fujita 428748de673SAkira Fujita if (depth) { 429748de673SAkira Fujita /* Register to journal */ 430748de673SAkira Fujita ret = ext4_journal_get_write_access(handle, orig_path->p_bh); 431748de673SAkira Fujita if (ret) 432748de673SAkira Fujita return ret; 433748de673SAkira Fujita } 434748de673SAkira Fujita 435748de673SAkira Fujita /* Expansion */ 436748de673SAkira Fujita if (range_to_move > 0 && 437748de673SAkira Fujita (range_to_move > le16_to_cpu(eh->eh_max) 438748de673SAkira Fujita - le16_to_cpu(eh->eh_entries))) { 439748de673SAkira Fujita 440748de673SAkira Fujita ret = mext_insert_across_blocks(handle, orig_inode, o_start, 441748de673SAkira Fujita o_end, start_ext, new_ext, end_ext); 442748de673SAkira Fujita if (ret < 0) 443748de673SAkira Fujita return ret; 444748de673SAkira Fujita } else 445748de673SAkira Fujita mext_insert_inside_block(o_start, o_end, start_ext, new_ext, 446748de673SAkira Fujita end_ext, eh, range_to_move); 447748de673SAkira Fujita 448748de673SAkira Fujita if (depth) { 449748de673SAkira Fujita ret = ext4_handle_dirty_metadata(handle, orig_inode, 450748de673SAkira Fujita orig_path->p_bh); 451748de673SAkira Fujita if (ret) 452748de673SAkira Fujita return ret; 453748de673SAkira Fujita } else { 454748de673SAkira Fujita ret = ext4_mark_inode_dirty(handle, orig_inode); 455748de673SAkira Fujita if (ret < 0) 456748de673SAkira Fujita return ret; 457748de673SAkira Fujita } 458748de673SAkira Fujita 459748de673SAkira Fujita return 0; 460748de673SAkira Fujita } 461748de673SAkira Fujita 462748de673SAkira Fujita /** 463748de673SAkira Fujita * mext_leaf_block - Move one leaf extent block into the inode. 464748de673SAkira Fujita * 465748de673SAkira Fujita * @handle: journal handle 466748de673SAkira Fujita * @orig_inode: original inode 467748de673SAkira Fujita * @orig_path: path indicates first extent to be changed 468748de673SAkira Fujita * @dext: donor extent 469748de673SAkira Fujita * @from: start offset on the target file 470748de673SAkira Fujita * 471748de673SAkira Fujita * In order to insert extents into the leaf block, we must divide the extent 472748de673SAkira Fujita * in the leaf block into three extents. The one is located to be inserted 473748de673SAkira Fujita * extents, and the others are located around it. 474748de673SAkira Fujita * 475748de673SAkira Fujita * Therefore, this function creates structures to save extents of the leaf 476748de673SAkira Fujita * block, and inserts extents by calling mext_insert_extents() with 477748de673SAkira Fujita * created extents. Return 0 on success, or a negative error value on failure. 478748de673SAkira Fujita */ 479748de673SAkira Fujita static int 480748de673SAkira Fujita mext_leaf_block(handle_t *handle, struct inode *orig_inode, 481748de673SAkira Fujita struct ext4_ext_path *orig_path, struct ext4_extent *dext, 482748de673SAkira Fujita ext4_lblk_t *from) 483748de673SAkira Fujita { 484748de673SAkira Fujita struct ext4_extent *oext, *o_start, *o_end, *prev_ext; 485748de673SAkira Fujita struct ext4_extent new_ext, start_ext, end_ext; 486748de673SAkira Fujita ext4_lblk_t new_ext_end; 487748de673SAkira Fujita ext4_fsblk_t new_phys_end; 488748de673SAkira Fujita int oext_alen, new_ext_alen, end_ext_alen; 489748de673SAkira Fujita int depth = ext_depth(orig_inode); 490748de673SAkira Fujita int ret; 491748de673SAkira Fujita 492748de673SAkira Fujita o_start = o_end = oext = orig_path[depth].p_ext; 493748de673SAkira Fujita oext_alen = ext4_ext_get_actual_len(oext); 494748de673SAkira Fujita start_ext.ee_len = end_ext.ee_len = 0; 495748de673SAkira Fujita 496748de673SAkira Fujita new_ext.ee_block = cpu_to_le32(*from); 497748de673SAkira Fujita ext4_ext_store_pblock(&new_ext, ext_pblock(dext)); 498748de673SAkira Fujita new_ext.ee_len = dext->ee_len; 499748de673SAkira Fujita new_ext_alen = ext4_ext_get_actual_len(&new_ext); 500748de673SAkira Fujita new_ext_end = le32_to_cpu(new_ext.ee_block) + new_ext_alen - 1; 501748de673SAkira Fujita new_phys_end = ext_pblock(&new_ext) + new_ext_alen - 1; 502748de673SAkira Fujita 503748de673SAkira Fujita /* 504748de673SAkira Fujita * Case: original extent is first 505748de673SAkira Fujita * oext |--------| 506748de673SAkira Fujita * new_ext |--| 507748de673SAkira Fujita * start_ext |--| 508748de673SAkira Fujita */ 509748de673SAkira Fujita if (le32_to_cpu(oext->ee_block) < le32_to_cpu(new_ext.ee_block) && 510748de673SAkira Fujita le32_to_cpu(new_ext.ee_block) < 511748de673SAkira Fujita le32_to_cpu(oext->ee_block) + oext_alen) { 512748de673SAkira Fujita start_ext.ee_len = cpu_to_le16(le32_to_cpu(new_ext.ee_block) - 513748de673SAkira Fujita le32_to_cpu(oext->ee_block)); 514748de673SAkira Fujita copy_extent_status(oext, &start_ext); 515748de673SAkira Fujita } else if (oext > EXT_FIRST_EXTENT(orig_path[depth].p_hdr)) { 516748de673SAkira Fujita prev_ext = oext - 1; 517748de673SAkira Fujita /* 518748de673SAkira Fujita * We can merge new_ext into previous extent, 519748de673SAkira Fujita * if these are contiguous and same extent type. 520748de673SAkira Fujita */ 521748de673SAkira Fujita if (ext4_can_extents_be_merged(orig_inode, prev_ext, 522748de673SAkira Fujita &new_ext)) { 523748de673SAkira Fujita o_start = prev_ext; 524748de673SAkira Fujita start_ext.ee_len = cpu_to_le16( 525748de673SAkira Fujita ext4_ext_get_actual_len(prev_ext) + 526748de673SAkira Fujita new_ext_alen); 527748de673SAkira Fujita copy_extent_status(prev_ext, &start_ext); 528748de673SAkira Fujita new_ext.ee_len = 0; 529748de673SAkira Fujita } 530748de673SAkira Fujita } 531748de673SAkira Fujita 532748de673SAkira Fujita /* 533748de673SAkira Fujita * Case: new_ext_end must be less than oext 534748de673SAkira Fujita * oext |-----------| 535748de673SAkira Fujita * new_ext |-------| 536748de673SAkira Fujita */ 537748de673SAkira Fujita BUG_ON(le32_to_cpu(oext->ee_block) + oext_alen - 1 < new_ext_end); 538748de673SAkira Fujita 539748de673SAkira Fujita /* 540748de673SAkira Fujita * Case: new_ext is smaller than original extent 541748de673SAkira Fujita * oext |---------------| 542748de673SAkira Fujita * new_ext |-----------| 543748de673SAkira Fujita * end_ext |---| 544748de673SAkira Fujita */ 545748de673SAkira Fujita if (le32_to_cpu(oext->ee_block) <= new_ext_end && 546748de673SAkira Fujita new_ext_end < le32_to_cpu(oext->ee_block) + oext_alen - 1) { 547748de673SAkira Fujita end_ext.ee_len = 548748de673SAkira Fujita cpu_to_le16(le32_to_cpu(oext->ee_block) + 549748de673SAkira Fujita oext_alen - 1 - new_ext_end); 550748de673SAkira Fujita copy_extent_status(oext, &end_ext); 551748de673SAkira Fujita end_ext_alen = ext4_ext_get_actual_len(&end_ext); 552748de673SAkira Fujita ext4_ext_store_pblock(&end_ext, 553748de673SAkira Fujita (ext_pblock(o_end) + oext_alen - end_ext_alen)); 554748de673SAkira Fujita end_ext.ee_block = 555748de673SAkira Fujita cpu_to_le32(le32_to_cpu(o_end->ee_block) + 556748de673SAkira Fujita oext_alen - end_ext_alen); 557748de673SAkira Fujita } 558748de673SAkira Fujita 559748de673SAkira Fujita ret = mext_insert_extents(handle, orig_inode, orig_path, o_start, 560748de673SAkira Fujita o_end, &start_ext, &new_ext, &end_ext); 561748de673SAkira Fujita return ret; 562748de673SAkira Fujita } 563748de673SAkira Fujita 564748de673SAkira Fujita /** 565748de673SAkira Fujita * mext_calc_swap_extents - Calculate extents for extent swapping. 566748de673SAkira Fujita * 567748de673SAkira Fujita * @tmp_dext: the extent that will belong to the original inode 568748de673SAkira Fujita * @tmp_oext: the extent that will belong to the donor inode 569748de673SAkira Fujita * @orig_off: block offset of original inode 570748de673SAkira Fujita * @donor_off: block offset of donor inode 571748de673SAkira Fujita * @max_count: the maximun length of extents 572748de673SAkira Fujita */ 573748de673SAkira Fujita static void 574748de673SAkira Fujita mext_calc_swap_extents(struct ext4_extent *tmp_dext, 575748de673SAkira Fujita struct ext4_extent *tmp_oext, 576748de673SAkira Fujita ext4_lblk_t orig_off, ext4_lblk_t donor_off, 577748de673SAkira Fujita ext4_lblk_t max_count) 578748de673SAkira Fujita { 579748de673SAkira Fujita ext4_lblk_t diff, orig_diff; 580748de673SAkira Fujita struct ext4_extent dext_old, oext_old; 581748de673SAkira Fujita 582748de673SAkira Fujita dext_old = *tmp_dext; 583748de673SAkira Fujita oext_old = *tmp_oext; 584748de673SAkira Fujita 585748de673SAkira Fujita /* When tmp_dext is too large, pick up the target range. */ 586748de673SAkira Fujita diff = donor_off - le32_to_cpu(tmp_dext->ee_block); 587748de673SAkira Fujita 588748de673SAkira Fujita ext4_ext_store_pblock(tmp_dext, ext_pblock(tmp_dext) + diff); 589748de673SAkira Fujita tmp_dext->ee_block = 590748de673SAkira Fujita cpu_to_le32(le32_to_cpu(tmp_dext->ee_block) + diff); 591748de673SAkira Fujita tmp_dext->ee_len = cpu_to_le16(le16_to_cpu(tmp_dext->ee_len) - diff); 592748de673SAkira Fujita 593748de673SAkira Fujita if (max_count < ext4_ext_get_actual_len(tmp_dext)) 594748de673SAkira Fujita tmp_dext->ee_len = cpu_to_le16(max_count); 595748de673SAkira Fujita 596748de673SAkira Fujita orig_diff = orig_off - le32_to_cpu(tmp_oext->ee_block); 597748de673SAkira Fujita ext4_ext_store_pblock(tmp_oext, ext_pblock(tmp_oext) + orig_diff); 598748de673SAkira Fujita 599748de673SAkira Fujita /* Adjust extent length if donor extent is larger than orig */ 600748de673SAkira Fujita if (ext4_ext_get_actual_len(tmp_dext) > 601748de673SAkira Fujita ext4_ext_get_actual_len(tmp_oext) - orig_diff) 602748de673SAkira Fujita tmp_dext->ee_len = cpu_to_le16(le16_to_cpu(tmp_oext->ee_len) - 603748de673SAkira Fujita orig_diff); 604748de673SAkira Fujita 605748de673SAkira Fujita tmp_oext->ee_len = cpu_to_le16(ext4_ext_get_actual_len(tmp_dext)); 606748de673SAkira Fujita 607748de673SAkira Fujita copy_extent_status(&oext_old, tmp_dext); 608748de673SAkira Fujita copy_extent_status(&dext_old, tmp_oext); 609748de673SAkira Fujita } 610748de673SAkira Fujita 611748de673SAkira Fujita /** 612748de673SAkira Fujita * mext_replace_branches - Replace original extents with new extents 613748de673SAkira Fujita * 614748de673SAkira Fujita * @handle: journal handle 615748de673SAkira Fujita * @orig_inode: original inode 616748de673SAkira Fujita * @donor_inode: donor inode 617748de673SAkira Fujita * @from: block offset of orig_inode 618748de673SAkira Fujita * @count: block count to be replaced 619748de673SAkira Fujita * 620748de673SAkira Fujita * Replace original inode extents and donor inode extents page by page. 621748de673SAkira Fujita * We implement this replacement in the following three steps: 622748de673SAkira Fujita * 1. Save the block information of original and donor inodes into 623748de673SAkira Fujita * dummy extents. 624748de673SAkira Fujita * 2. Change the block information of original inode to point at the 625748de673SAkira Fujita * donor inode blocks. 626748de673SAkira Fujita * 3. Change the block information of donor inode to point at the saved 627748de673SAkira Fujita * original inode blocks in the dummy extents. 628748de673SAkira Fujita * 629748de673SAkira Fujita * Return 0 on success, or a negative error value on failure. 630748de673SAkira Fujita */ 631748de673SAkira Fujita static int 632748de673SAkira Fujita mext_replace_branches(handle_t *handle, struct inode *orig_inode, 633748de673SAkira Fujita struct inode *donor_inode, ext4_lblk_t from, 634748de673SAkira Fujita ext4_lblk_t count) 635748de673SAkira Fujita { 636748de673SAkira Fujita struct ext4_ext_path *orig_path = NULL; 637748de673SAkira Fujita struct ext4_ext_path *donor_path = NULL; 638748de673SAkira Fujita struct ext4_extent *oext, *dext; 639748de673SAkira Fujita struct ext4_extent tmp_dext, tmp_oext; 640748de673SAkira Fujita ext4_lblk_t orig_off = from, donor_off = from; 641748de673SAkira Fujita int err = 0; 642748de673SAkira Fujita int depth; 643748de673SAkira Fujita int replaced_count = 0; 644748de673SAkira Fujita int dext_alen; 645748de673SAkira Fujita 646748de673SAkira Fujita mext_double_down_write(orig_inode, donor_inode); 647748de673SAkira Fujita 648748de673SAkira Fujita /* Get the original extent for the block "orig_off" */ 649e8505970SAkira Fujita err = get_ext_path(orig_inode, orig_off, &orig_path); 650748de673SAkira Fujita if (orig_path == NULL) 651748de673SAkira Fujita goto out; 652748de673SAkira Fujita 653748de673SAkira Fujita /* Get the donor extent for the head */ 654e8505970SAkira Fujita err = get_ext_path(donor_inode, donor_off, &donor_path); 655748de673SAkira Fujita if (donor_path == NULL) 656748de673SAkira Fujita goto out; 657748de673SAkira Fujita depth = ext_depth(orig_inode); 658748de673SAkira Fujita oext = orig_path[depth].p_ext; 659748de673SAkira Fujita tmp_oext = *oext; 660748de673SAkira Fujita 661748de673SAkira Fujita depth = ext_depth(donor_inode); 662748de673SAkira Fujita dext = donor_path[depth].p_ext; 663748de673SAkira Fujita tmp_dext = *dext; 664748de673SAkira Fujita 665748de673SAkira Fujita mext_calc_swap_extents(&tmp_dext, &tmp_oext, orig_off, 666748de673SAkira Fujita donor_off, count); 667748de673SAkira Fujita 668748de673SAkira Fujita /* Loop for the donor extents */ 669748de673SAkira Fujita while (1) { 670748de673SAkira Fujita /* The extent for donor must be found. */ 671748de673SAkira Fujita BUG_ON(!dext || donor_off != le32_to_cpu(tmp_dext.ee_block)); 672748de673SAkira Fujita 673748de673SAkira Fujita /* Set donor extent to orig extent */ 674748de673SAkira Fujita err = mext_leaf_block(handle, orig_inode, 675748de673SAkira Fujita orig_path, &tmp_dext, &orig_off); 676748de673SAkira Fujita if (err < 0) 677748de673SAkira Fujita goto out; 678748de673SAkira Fujita 679748de673SAkira Fujita /* Set orig extent to donor extent */ 680748de673SAkira Fujita err = mext_leaf_block(handle, donor_inode, 681748de673SAkira Fujita donor_path, &tmp_oext, &donor_off); 682748de673SAkira Fujita if (err < 0) 683748de673SAkira Fujita goto out; 684748de673SAkira Fujita 685748de673SAkira Fujita dext_alen = ext4_ext_get_actual_len(&tmp_dext); 686748de673SAkira Fujita replaced_count += dext_alen; 687748de673SAkira Fujita donor_off += dext_alen; 688748de673SAkira Fujita orig_off += dext_alen; 689748de673SAkira Fujita 690748de673SAkira Fujita /* Already moved the expected blocks */ 691748de673SAkira Fujita if (replaced_count >= count) 692748de673SAkira Fujita break; 693748de673SAkira Fujita 694748de673SAkira Fujita if (orig_path) 695748de673SAkira Fujita ext4_ext_drop_refs(orig_path); 696e8505970SAkira Fujita err = get_ext_path(orig_inode, orig_off, &orig_path); 697748de673SAkira Fujita if (orig_path == NULL) 698748de673SAkira Fujita goto out; 699748de673SAkira Fujita depth = ext_depth(orig_inode); 700748de673SAkira Fujita oext = orig_path[depth].p_ext; 701748de673SAkira Fujita if (le32_to_cpu(oext->ee_block) + 702748de673SAkira Fujita ext4_ext_get_actual_len(oext) <= orig_off) { 703748de673SAkira Fujita err = 0; 704748de673SAkira Fujita goto out; 705748de673SAkira Fujita } 706748de673SAkira Fujita tmp_oext = *oext; 707748de673SAkira Fujita 708748de673SAkira Fujita if (donor_path) 709748de673SAkira Fujita ext4_ext_drop_refs(donor_path); 710e8505970SAkira Fujita err = get_ext_path(donor_inode, donor_off, &donor_path); 711748de673SAkira Fujita if (donor_path == NULL) 712748de673SAkira Fujita goto out; 713748de673SAkira Fujita depth = ext_depth(donor_inode); 714748de673SAkira Fujita dext = donor_path[depth].p_ext; 715748de673SAkira Fujita if (le32_to_cpu(dext->ee_block) + 716748de673SAkira Fujita ext4_ext_get_actual_len(dext) <= donor_off) { 717748de673SAkira Fujita err = 0; 718748de673SAkira Fujita goto out; 719748de673SAkira Fujita } 720748de673SAkira Fujita tmp_dext = *dext; 721748de673SAkira Fujita 722748de673SAkira Fujita mext_calc_swap_extents(&tmp_dext, &tmp_oext, orig_off, 723748de673SAkira Fujita donor_off, 724748de673SAkira Fujita count - replaced_count); 725748de673SAkira Fujita } 726748de673SAkira Fujita 727748de673SAkira Fujita out: 728748de673SAkira Fujita if (orig_path) { 729748de673SAkira Fujita ext4_ext_drop_refs(orig_path); 730748de673SAkira Fujita kfree(orig_path); 731748de673SAkira Fujita } 732748de673SAkira Fujita if (donor_path) { 733748de673SAkira Fujita ext4_ext_drop_refs(donor_path); 734748de673SAkira Fujita kfree(donor_path); 735748de673SAkira Fujita } 736748de673SAkira Fujita 737748de673SAkira Fujita mext_double_up_write(orig_inode, donor_inode); 738748de673SAkira Fujita return err; 739748de673SAkira Fujita } 740748de673SAkira Fujita 741748de673SAkira Fujita /** 742748de673SAkira Fujita * move_extent_per_page - Move extent data per page 743748de673SAkira Fujita * 744748de673SAkira Fujita * @o_filp: file structure of original file 745748de673SAkira Fujita * @donor_inode: donor inode 746748de673SAkira Fujita * @orig_page_offset: page index on original file 747748de673SAkira Fujita * @data_offset_in_page: block index where data swapping starts 748748de673SAkira Fujita * @block_len_in_page: the number of blocks to be swapped 749748de673SAkira Fujita * @uninit: orig extent is uninitialized or not 750748de673SAkira Fujita * 751748de673SAkira Fujita * Save the data in original inode blocks and replace original inode extents 752748de673SAkira Fujita * with donor inode extents by calling mext_replace_branches(). 753748de673SAkira Fujita * Finally, write out the saved data in new original inode blocks. Return 0 754748de673SAkira Fujita * on success, or a negative error value on failure. 755748de673SAkira Fujita */ 756748de673SAkira Fujita static int 75744fc48f7SAkira Fujita move_extent_per_page(struct file *o_filp, struct inode *donor_inode, 758748de673SAkira Fujita pgoff_t orig_page_offset, int data_offset_in_page, 759748de673SAkira Fujita int block_len_in_page, int uninit) 760748de673SAkira Fujita { 761748de673SAkira Fujita struct inode *orig_inode = o_filp->f_dentry->d_inode; 762748de673SAkira Fujita struct address_space *mapping = orig_inode->i_mapping; 763748de673SAkira Fujita struct buffer_head *bh; 764748de673SAkira Fujita struct page *page = NULL; 765748de673SAkira Fujita const struct address_space_operations *a_ops = mapping->a_ops; 766748de673SAkira Fujita handle_t *handle; 767748de673SAkira Fujita ext4_lblk_t orig_blk_offset; 768748de673SAkira Fujita long long offs = orig_page_offset << PAGE_CACHE_SHIFT; 769748de673SAkira Fujita unsigned long blocksize = orig_inode->i_sb->s_blocksize; 770748de673SAkira Fujita unsigned int w_flags = 0; 771748de673SAkira Fujita unsigned int tmp_data_len, data_len; 772748de673SAkira Fujita void *fsdata; 773748de673SAkira Fujita int ret, i, jblocks; 774748de673SAkira Fujita int blocks_per_page = PAGE_CACHE_SIZE >> orig_inode->i_blkbits; 775748de673SAkira Fujita 776748de673SAkira Fujita /* 777748de673SAkira Fujita * It needs twice the amount of ordinary journal buffers because 778748de673SAkira Fujita * inode and donor_inode may change each different metadata blocks. 779748de673SAkira Fujita */ 780748de673SAkira Fujita jblocks = ext4_writepage_trans_blocks(orig_inode) * 2; 781748de673SAkira Fujita handle = ext4_journal_start(orig_inode, jblocks); 782748de673SAkira Fujita if (IS_ERR(handle)) { 783748de673SAkira Fujita ret = PTR_ERR(handle); 784748de673SAkira Fujita return ret; 785748de673SAkira Fujita } 786748de673SAkira Fujita 787748de673SAkira Fujita if (segment_eq(get_fs(), KERNEL_DS)) 788748de673SAkira Fujita w_flags |= AOP_FLAG_UNINTERRUPTIBLE; 789748de673SAkira Fujita 790748de673SAkira Fujita orig_blk_offset = orig_page_offset * blocks_per_page + 791748de673SAkira Fujita data_offset_in_page; 792748de673SAkira Fujita 793748de673SAkira Fujita /* 794748de673SAkira Fujita * If orig extent is uninitialized one, 795748de673SAkira Fujita * it's not necessary force the page into memory 796748de673SAkira Fujita * and then force it to be written out again. 797748de673SAkira Fujita * Just swap data blocks between orig and donor. 798748de673SAkira Fujita */ 799748de673SAkira Fujita if (uninit) { 800748de673SAkira Fujita ret = mext_replace_branches(handle, orig_inode, 801748de673SAkira Fujita donor_inode, orig_blk_offset, 802748de673SAkira Fujita block_len_in_page); 803748de673SAkira Fujita 804748de673SAkira Fujita /* Clear the inode cache not to refer to the old data */ 805748de673SAkira Fujita ext4_ext_invalidate_cache(orig_inode); 806748de673SAkira Fujita ext4_ext_invalidate_cache(donor_inode); 807748de673SAkira Fujita goto out2; 808748de673SAkira Fujita } 809748de673SAkira Fujita 810748de673SAkira Fujita offs = (long long)orig_blk_offset << orig_inode->i_blkbits; 811748de673SAkira Fujita 812748de673SAkira Fujita /* Calculate data_len */ 813748de673SAkira Fujita if ((orig_blk_offset + block_len_in_page - 1) == 814748de673SAkira Fujita ((orig_inode->i_size - 1) >> orig_inode->i_blkbits)) { 815748de673SAkira Fujita /* Replace the last block */ 816748de673SAkira Fujita tmp_data_len = orig_inode->i_size & (blocksize - 1); 817748de673SAkira Fujita /* 818748de673SAkira Fujita * If data_len equal zero, it shows data_len is multiples of 819748de673SAkira Fujita * blocksize. So we set appropriate value. 820748de673SAkira Fujita */ 821748de673SAkira Fujita if (tmp_data_len == 0) 822748de673SAkira Fujita tmp_data_len = blocksize; 823748de673SAkira Fujita 824748de673SAkira Fujita data_len = tmp_data_len + 825748de673SAkira Fujita ((block_len_in_page - 1) << orig_inode->i_blkbits); 826748de673SAkira Fujita } else { 827748de673SAkira Fujita data_len = block_len_in_page << orig_inode->i_blkbits; 828748de673SAkira Fujita } 829748de673SAkira Fujita 830748de673SAkira Fujita ret = a_ops->write_begin(o_filp, mapping, offs, data_len, w_flags, 831748de673SAkira Fujita &page, &fsdata); 832748de673SAkira Fujita if (unlikely(ret < 0)) 833748de673SAkira Fujita goto out; 834748de673SAkira Fujita 835748de673SAkira Fujita if (!PageUptodate(page)) { 836748de673SAkira Fujita mapping->a_ops->readpage(o_filp, page); 837748de673SAkira Fujita lock_page(page); 838748de673SAkira Fujita } 839748de673SAkira Fujita 840748de673SAkira Fujita /* 841748de673SAkira Fujita * try_to_release_page() doesn't call releasepage in writeback mode. 842748de673SAkira Fujita * We should care about the order of writing to the same file 843748de673SAkira Fujita * by multiple move extent processes. 844748de673SAkira Fujita * It needs to call wait_on_page_writeback() to wait for the 845748de673SAkira Fujita * writeback of the page. 846748de673SAkira Fujita */ 847748de673SAkira Fujita if (PageWriteback(page)) 848748de673SAkira Fujita wait_on_page_writeback(page); 849748de673SAkira Fujita 850748de673SAkira Fujita /* Release old bh and drop refs */ 851748de673SAkira Fujita try_to_release_page(page, 0); 852748de673SAkira Fujita 853748de673SAkira Fujita ret = mext_replace_branches(handle, orig_inode, donor_inode, 854748de673SAkira Fujita orig_blk_offset, block_len_in_page); 855748de673SAkira Fujita if (ret < 0) 856748de673SAkira Fujita goto out; 857748de673SAkira Fujita 858748de673SAkira Fujita /* Clear the inode cache not to refer to the old data */ 859748de673SAkira Fujita ext4_ext_invalidate_cache(orig_inode); 860748de673SAkira Fujita ext4_ext_invalidate_cache(donor_inode); 861748de673SAkira Fujita 862748de673SAkira Fujita if (!page_has_buffers(page)) 863748de673SAkira Fujita create_empty_buffers(page, 1 << orig_inode->i_blkbits, 0); 864748de673SAkira Fujita 865748de673SAkira Fujita bh = page_buffers(page); 866748de673SAkira Fujita for (i = 0; i < data_offset_in_page; i++) 867748de673SAkira Fujita bh = bh->b_this_page; 868748de673SAkira Fujita 869748de673SAkira Fujita for (i = 0; i < block_len_in_page; i++) { 870748de673SAkira Fujita ret = ext4_get_block(orig_inode, 871748de673SAkira Fujita (sector_t)(orig_blk_offset + i), bh, 0); 872748de673SAkira Fujita if (ret < 0) 873748de673SAkira Fujita goto out; 874748de673SAkira Fujita 875748de673SAkira Fujita if (bh->b_this_page != NULL) 876748de673SAkira Fujita bh = bh->b_this_page; 877748de673SAkira Fujita } 878748de673SAkira Fujita 879748de673SAkira Fujita ret = a_ops->write_end(o_filp, mapping, offs, data_len, data_len, 880748de673SAkira Fujita page, fsdata); 881748de673SAkira Fujita page = NULL; 882748de673SAkira Fujita 883748de673SAkira Fujita out: 884748de673SAkira Fujita if (unlikely(page)) { 885748de673SAkira Fujita if (PageLocked(page)) 886748de673SAkira Fujita unlock_page(page); 887748de673SAkira Fujita page_cache_release(page); 88891cc219aSPeng Tao ext4_journal_stop(handle); 889748de673SAkira Fujita } 890748de673SAkira Fujita out2: 891748de673SAkira Fujita ext4_journal_stop(handle); 892748de673SAkira Fujita 893748de673SAkira Fujita return ret < 0 ? ret : 0; 894748de673SAkira Fujita } 895748de673SAkira Fujita 896748de673SAkira Fujita /** 897748de673SAkira Fujita * mext_check_argumants - Check whether move extent can be done 898748de673SAkira Fujita * 899748de673SAkira Fujita * @orig_inode: original inode 900748de673SAkira Fujita * @donor_inode: donor inode 901748de673SAkira Fujita * @orig_start: logical start offset in block for orig 902748de673SAkira Fujita * @donor_start: logical start offset in block for donor 903748de673SAkira Fujita * @len: the number of blocks to be moved 904748de673SAkira Fujita * @moved_len: moved block length 905748de673SAkira Fujita * 906748de673SAkira Fujita * Check the arguments of ext4_move_extents() whether the files can be 907748de673SAkira Fujita * exchanged with each other. 908748de673SAkira Fujita * Return 0 on success, or a negative error value on failure. 909748de673SAkira Fujita */ 910748de673SAkira Fujita static int 911748de673SAkira Fujita mext_check_arguments(struct inode *orig_inode, 912748de673SAkira Fujita struct inode *donor_inode, __u64 orig_start, 913748de673SAkira Fujita __u64 donor_start, __u64 *len, __u64 moved_len) 914748de673SAkira Fujita { 91570d5d3dcSAkira Fujita ext4_lblk_t orig_blocks, donor_blocks; 91670d5d3dcSAkira Fujita unsigned int blkbits = orig_inode->i_blkbits; 91770d5d3dcSAkira Fujita unsigned int blocksize = 1 << blkbits; 91870d5d3dcSAkira Fujita 919748de673SAkira Fujita /* Regular file check */ 920748de673SAkira Fujita if (!S_ISREG(orig_inode->i_mode) || !S_ISREG(donor_inode->i_mode)) { 921748de673SAkira Fujita ext4_debug("ext4 move extent: The argument files should be " 922748de673SAkira Fujita "regular file [ino:orig %lu, donor %lu]\n", 923748de673SAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 924748de673SAkira Fujita return -EINVAL; 925748de673SAkira Fujita } 926748de673SAkira Fujita 927748de673SAkira Fujita /* Ext4 move extent does not support swapfile */ 928748de673SAkira Fujita if (IS_SWAPFILE(orig_inode) || IS_SWAPFILE(donor_inode)) { 929748de673SAkira Fujita ext4_debug("ext4 move extent: The argument files should " 930748de673SAkira Fujita "not be swapfile [ino:orig %lu, donor %lu]\n", 931748de673SAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 932748de673SAkira Fujita return -EINVAL; 933748de673SAkira Fujita } 934748de673SAkira Fujita 935748de673SAkira Fujita /* Files should be in the same ext4 FS */ 936748de673SAkira Fujita if (orig_inode->i_sb != donor_inode->i_sb) { 937748de673SAkira Fujita ext4_debug("ext4 move extent: The argument files " 938748de673SAkira Fujita "should be in same FS [ino:orig %lu, donor %lu]\n", 939748de673SAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 940748de673SAkira Fujita return -EINVAL; 941748de673SAkira Fujita } 942748de673SAkira Fujita 943748de673SAkira Fujita /* orig and donor should be different file */ 944748de673SAkira Fujita if (orig_inode->i_ino == donor_inode->i_ino) { 945748de673SAkira Fujita ext4_debug("ext4 move extent: The argument files should not " 946748de673SAkira Fujita "be same file [ino:orig %lu, donor %lu]\n", 947748de673SAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 948748de673SAkira Fujita return -EINVAL; 949748de673SAkira Fujita } 950748de673SAkira Fujita 951748de673SAkira Fujita /* Ext4 move extent supports only extent based file */ 952748de673SAkira Fujita if (!(EXT4_I(orig_inode)->i_flags & EXT4_EXTENTS_FL)) { 953748de673SAkira Fujita ext4_debug("ext4 move extent: orig file is not extents " 954748de673SAkira Fujita "based file [ino:orig %lu]\n", orig_inode->i_ino); 955748de673SAkira Fujita return -EOPNOTSUPP; 956748de673SAkira Fujita } else if (!(EXT4_I(donor_inode)->i_flags & EXT4_EXTENTS_FL)) { 957748de673SAkira Fujita ext4_debug("ext4 move extent: donor file is not extents " 958748de673SAkira Fujita "based file [ino:donor %lu]\n", donor_inode->i_ino); 959748de673SAkira Fujita return -EOPNOTSUPP; 960748de673SAkira Fujita } 961748de673SAkira Fujita 962748de673SAkira Fujita if ((!orig_inode->i_size) || (!donor_inode->i_size)) { 963748de673SAkira Fujita ext4_debug("ext4 move extent: File size is 0 byte\n"); 964748de673SAkira Fujita return -EINVAL; 965748de673SAkira Fujita } 966748de673SAkira Fujita 967748de673SAkira Fujita /* Start offset should be same */ 968748de673SAkira Fujita if (orig_start != donor_start) { 969748de673SAkira Fujita ext4_debug("ext4 move extent: orig and donor's start " 970748de673SAkira Fujita "offset are not same [ino:orig %lu, donor %lu]\n", 971748de673SAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 972748de673SAkira Fujita return -EINVAL; 973748de673SAkira Fujita } 974748de673SAkira Fujita 975748de673SAkira Fujita if (moved_len) { 976748de673SAkira Fujita ext4_debug("ext4 move extent: moved_len should be 0 " 977748de673SAkira Fujita "[ino:orig %lu, donor %lu]\n", orig_inode->i_ino, 978748de673SAkira Fujita donor_inode->i_ino); 979748de673SAkira Fujita return -EINVAL; 980748de673SAkira Fujita } 981748de673SAkira Fujita 982748de673SAkira Fujita if ((orig_start > MAX_DEFRAG_SIZE) || 983748de673SAkira Fujita (donor_start > MAX_DEFRAG_SIZE) || 984748de673SAkira Fujita (*len > MAX_DEFRAG_SIZE) || 985748de673SAkira Fujita (orig_start + *len > MAX_DEFRAG_SIZE)) { 986748de673SAkira Fujita ext4_debug("ext4 move extent: Can't handle over [%lu] blocks " 987748de673SAkira Fujita "[ino:orig %lu, donor %lu]\n", MAX_DEFRAG_SIZE, 988748de673SAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 989748de673SAkira Fujita return -EINVAL; 990748de673SAkira Fujita } 991748de673SAkira Fujita 992748de673SAkira Fujita if (orig_inode->i_size > donor_inode->i_size) { 99370d5d3dcSAkira Fujita donor_blocks = (donor_inode->i_size + blocksize - 1) >> blkbits; 99470d5d3dcSAkira Fujita /* TODO: eliminate this artificial restriction */ 99570d5d3dcSAkira Fujita if (orig_start >= donor_blocks) { 996748de673SAkira Fujita ext4_debug("ext4 move extent: orig start offset " 99770d5d3dcSAkira Fujita "[%llu] should be less than donor file blocks " 99870d5d3dcSAkira Fujita "[%u] [ino:orig %lu, donor %lu]\n", 99970d5d3dcSAkira Fujita orig_start, donor_blocks, 1000748de673SAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 1001748de673SAkira Fujita return -EINVAL; 1002748de673SAkira Fujita } 1003748de673SAkira Fujita 100470d5d3dcSAkira Fujita /* TODO: eliminate this artificial restriction */ 100570d5d3dcSAkira Fujita if (orig_start + *len > donor_blocks) { 1006748de673SAkira Fujita ext4_debug("ext4 move extent: End offset [%llu] should " 100770d5d3dcSAkira Fujita "be less than donor file blocks [%u]." 100870d5d3dcSAkira Fujita "So adjust length from %llu to %llu " 1009748de673SAkira Fujita "[ino:orig %lu, donor %lu]\n", 101070d5d3dcSAkira Fujita orig_start + *len, donor_blocks, 101170d5d3dcSAkira Fujita *len, donor_blocks - orig_start, 1012748de673SAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 101370d5d3dcSAkira Fujita *len = donor_blocks - orig_start; 1014748de673SAkira Fujita } 1015748de673SAkira Fujita } else { 101670d5d3dcSAkira Fujita orig_blocks = (orig_inode->i_size + blocksize - 1) >> blkbits; 101770d5d3dcSAkira Fujita if (orig_start >= orig_blocks) { 1018748de673SAkira Fujita ext4_debug("ext4 move extent: start offset [%llu] " 101970d5d3dcSAkira Fujita "should be less than original file blocks " 102070d5d3dcSAkira Fujita "[%u] [ino:orig %lu, donor %lu]\n", 102170d5d3dcSAkira Fujita orig_start, orig_blocks, 1022748de673SAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 1023748de673SAkira Fujita return -EINVAL; 1024748de673SAkira Fujita } 1025748de673SAkira Fujita 102670d5d3dcSAkira Fujita if (orig_start + *len > orig_blocks) { 1027748de673SAkira Fujita ext4_debug("ext4 move extent: Adjust length " 102870d5d3dcSAkira Fujita "from %llu to %llu. Because it should be " 102970d5d3dcSAkira Fujita "less than original file blocks " 1030748de673SAkira Fujita "[ino:orig %lu, donor %lu]\n", 103170d5d3dcSAkira Fujita *len, orig_blocks - orig_start, 1032748de673SAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 103370d5d3dcSAkira Fujita *len = orig_blocks - orig_start; 1034748de673SAkira Fujita } 1035748de673SAkira Fujita } 1036748de673SAkira Fujita 1037748de673SAkira Fujita if (!*len) { 1038748de673SAkira Fujita ext4_debug("ext4 move extent: len shoudld not be 0 " 1039748de673SAkira Fujita "[ino:orig %lu, donor %lu]\n", orig_inode->i_ino, 1040748de673SAkira Fujita donor_inode->i_ino); 1041748de673SAkira Fujita return -EINVAL; 1042748de673SAkira Fujita } 1043748de673SAkira Fujita 1044748de673SAkira Fujita return 0; 1045748de673SAkira Fujita } 1046748de673SAkira Fujita 1047748de673SAkira Fujita /** 1048748de673SAkira Fujita * mext_inode_double_lock - Lock i_mutex on both @inode1 and @inode2 1049748de673SAkira Fujita * 1050748de673SAkira Fujita * @inode1: the inode structure 1051748de673SAkira Fujita * @inode2: the inode structure 1052748de673SAkira Fujita * 1053748de673SAkira Fujita * Lock two inodes' i_mutex by i_ino order. This function is moved from 1054748de673SAkira Fujita * fs/inode.c. 1055748de673SAkira Fujita */ 1056748de673SAkira Fujita static void 1057748de673SAkira Fujita mext_inode_double_lock(struct inode *inode1, struct inode *inode2) 1058748de673SAkira Fujita { 1059748de673SAkira Fujita if (inode1 == NULL || inode2 == NULL || inode1 == inode2) { 1060748de673SAkira Fujita if (inode1) 1061748de673SAkira Fujita mutex_lock(&inode1->i_mutex); 1062748de673SAkira Fujita else if (inode2) 1063748de673SAkira Fujita mutex_lock(&inode2->i_mutex); 1064748de673SAkira Fujita return; 1065748de673SAkira Fujita } 1066748de673SAkira Fujita 1067748de673SAkira Fujita if (inode1->i_ino < inode2->i_ino) { 1068748de673SAkira Fujita mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT); 1069748de673SAkira Fujita mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD); 1070748de673SAkira Fujita } else { 1071748de673SAkira Fujita mutex_lock_nested(&inode2->i_mutex, I_MUTEX_PARENT); 1072748de673SAkira Fujita mutex_lock_nested(&inode1->i_mutex, I_MUTEX_CHILD); 1073748de673SAkira Fujita } 1074748de673SAkira Fujita } 1075748de673SAkira Fujita 1076748de673SAkira Fujita /** 1077748de673SAkira Fujita * mext_inode_double_unlock - Release i_mutex on both @inode1 and @inode2 1078748de673SAkira Fujita * 1079748de673SAkira Fujita * @inode1: the inode that is released first 1080748de673SAkira Fujita * @inode2: the inode that is released second 1081748de673SAkira Fujita * 1082748de673SAkira Fujita * This function is moved from fs/inode.c. 1083748de673SAkira Fujita */ 1084748de673SAkira Fujita 1085748de673SAkira Fujita static void 1086748de673SAkira Fujita mext_inode_double_unlock(struct inode *inode1, struct inode *inode2) 1087748de673SAkira Fujita { 1088748de673SAkira Fujita if (inode1) 1089748de673SAkira Fujita mutex_unlock(&inode1->i_mutex); 1090748de673SAkira Fujita 1091748de673SAkira Fujita if (inode2 && inode2 != inode1) 1092748de673SAkira Fujita mutex_unlock(&inode2->i_mutex); 1093748de673SAkira Fujita } 1094748de673SAkira Fujita 1095748de673SAkira Fujita /** 1096748de673SAkira Fujita * ext4_move_extents - Exchange the specified range of a file 1097748de673SAkira Fujita * 1098748de673SAkira Fujita * @o_filp: file structure of the original file 1099748de673SAkira Fujita * @d_filp: file structure of the donor file 1100748de673SAkira Fujita * @orig_start: start offset in block for orig 1101748de673SAkira Fujita * @donor_start: start offset in block for donor 1102748de673SAkira Fujita * @len: the number of blocks to be moved 1103748de673SAkira Fujita * @moved_len: moved block length 1104748de673SAkira Fujita * 1105748de673SAkira Fujita * This function returns 0 and moved block length is set in moved_len 1106748de673SAkira Fujita * if succeed, otherwise returns error value. 1107748de673SAkira Fujita * 1108748de673SAkira Fujita * Note: ext4_move_extents() proceeds the following order. 1109748de673SAkira Fujita * 1:ext4_move_extents() calculates the last block number of moving extent 1110748de673SAkira Fujita * function by the start block number (orig_start) and the number of blocks 1111748de673SAkira Fujita * to be moved (len) specified as arguments. 1112748de673SAkira Fujita * If the {orig, donor}_start points a hole, the extent's start offset 1113748de673SAkira Fujita * pointed by ext_cur (current extent), holecheck_path, orig_path are set 1114748de673SAkira Fujita * after hole behind. 1115748de673SAkira Fujita * 2:Continue step 3 to step 5, until the holecheck_path points to last_extent 1116748de673SAkira Fujita * or the ext_cur exceeds the block_end which is last logical block number. 1117748de673SAkira Fujita * 3:To get the length of continues area, call mext_next_extent() 1118748de673SAkira Fujita * specified with the ext_cur (initial value is holecheck_path) re-cursive, 1119748de673SAkira Fujita * until find un-continuous extent, the start logical block number exceeds 1120748de673SAkira Fujita * the block_end or the extent points to the last extent. 1121748de673SAkira Fujita * 4:Exchange the original inode data with donor inode data 1122748de673SAkira Fujita * from orig_page_offset to seq_end_page. 1123748de673SAkira Fujita * The start indexes of data are specified as arguments. 1124748de673SAkira Fujita * That of the original inode is orig_page_offset, 1125748de673SAkira Fujita * and the donor inode is also orig_page_offset 1126748de673SAkira Fujita * (To easily handle blocksize != pagesize case, the offset for the 1127748de673SAkira Fujita * donor inode is block unit). 1128748de673SAkira Fujita * 5:Update holecheck_path and orig_path to points a next proceeding extent, 1129748de673SAkira Fujita * then returns to step 2. 1130748de673SAkira Fujita * 6:Release holecheck_path, orig_path and set the len to moved_len 1131748de673SAkira Fujita * which shows the number of moved blocks. 1132748de673SAkira Fujita * The moved_len is useful for the command to calculate the file offset 1133748de673SAkira Fujita * for starting next move extent ioctl. 1134748de673SAkira Fujita * 7:Return 0 on success, or a negative error value on failure. 1135748de673SAkira Fujita */ 1136748de673SAkira Fujita int 1137748de673SAkira Fujita ext4_move_extents(struct file *o_filp, struct file *d_filp, 1138748de673SAkira Fujita __u64 orig_start, __u64 donor_start, __u64 len, 1139748de673SAkira Fujita __u64 *moved_len) 1140748de673SAkira Fujita { 1141748de673SAkira Fujita struct inode *orig_inode = o_filp->f_dentry->d_inode; 1142748de673SAkira Fujita struct inode *donor_inode = d_filp->f_dentry->d_inode; 1143748de673SAkira Fujita struct ext4_ext_path *orig_path = NULL, *holecheck_path = NULL; 1144748de673SAkira Fujita struct ext4_extent *ext_prev, *ext_cur, *ext_dummy; 1145748de673SAkira Fujita ext4_lblk_t block_start = orig_start; 1146748de673SAkira Fujita ext4_lblk_t block_end, seq_start, add_blocks, file_end, seq_blocks = 0; 1147748de673SAkira Fujita ext4_lblk_t rest_blocks; 1148748de673SAkira Fujita pgoff_t orig_page_offset = 0, seq_end_page; 1149748de673SAkira Fujita int ret, depth, last_extent = 0; 1150748de673SAkira Fujita int blocks_per_page = PAGE_CACHE_SIZE >> orig_inode->i_blkbits; 1151748de673SAkira Fujita int data_offset_in_page; 1152748de673SAkira Fujita int block_len_in_page; 1153748de673SAkira Fujita int uninit; 1154748de673SAkira Fujita 1155748de673SAkira Fujita /* protect orig and donor against a truncate */ 1156748de673SAkira Fujita mext_inode_double_lock(orig_inode, donor_inode); 1157748de673SAkira Fujita 1158748de673SAkira Fujita mext_double_down_read(orig_inode, donor_inode); 1159748de673SAkira Fujita /* Check the filesystem environment whether move_extent can be done */ 1160748de673SAkira Fujita ret = mext_check_arguments(orig_inode, donor_inode, orig_start, 1161748de673SAkira Fujita donor_start, &len, *moved_len); 1162748de673SAkira Fujita mext_double_up_read(orig_inode, donor_inode); 1163748de673SAkira Fujita if (ret) 1164748de673SAkira Fujita goto out2; 1165748de673SAkira Fujita 1166748de673SAkira Fujita file_end = (i_size_read(orig_inode) - 1) >> orig_inode->i_blkbits; 1167748de673SAkira Fujita block_end = block_start + len - 1; 1168748de673SAkira Fujita if (file_end < block_end) 1169748de673SAkira Fujita len -= block_end - file_end; 1170748de673SAkira Fujita 1171e8505970SAkira Fujita ret = get_ext_path(orig_inode, block_start, &orig_path); 1172748de673SAkira Fujita if (orig_path == NULL) 1173748de673SAkira Fujita goto out2; 1174748de673SAkira Fujita 1175748de673SAkira Fujita /* Get path structure to check the hole */ 1176e8505970SAkira Fujita ret = get_ext_path(orig_inode, block_start, &holecheck_path); 1177748de673SAkira Fujita if (holecheck_path == NULL) 1178748de673SAkira Fujita goto out; 1179748de673SAkira Fujita 1180748de673SAkira Fujita depth = ext_depth(orig_inode); 1181748de673SAkira Fujita ext_cur = holecheck_path[depth].p_ext; 1182748de673SAkira Fujita if (ext_cur == NULL) { 1183748de673SAkira Fujita ret = -EINVAL; 1184748de673SAkira Fujita goto out; 1185748de673SAkira Fujita } 1186748de673SAkira Fujita 1187748de673SAkira Fujita /* 1188748de673SAkira Fujita * Get proper extent whose ee_block is beyond block_start 1189748de673SAkira Fujita * if block_start was within the hole. 1190748de673SAkira Fujita */ 1191748de673SAkira Fujita if (le32_to_cpu(ext_cur->ee_block) + 1192748de673SAkira Fujita ext4_ext_get_actual_len(ext_cur) - 1 < block_start) { 1193748de673SAkira Fujita last_extent = mext_next_extent(orig_inode, 1194748de673SAkira Fujita holecheck_path, &ext_cur); 1195748de673SAkira Fujita if (last_extent < 0) { 1196748de673SAkira Fujita ret = last_extent; 1197748de673SAkira Fujita goto out; 1198748de673SAkira Fujita } 1199748de673SAkira Fujita last_extent = mext_next_extent(orig_inode, orig_path, 1200748de673SAkira Fujita &ext_dummy); 1201748de673SAkira Fujita if (last_extent < 0) { 1202748de673SAkira Fujita ret = last_extent; 1203748de673SAkira Fujita goto out; 1204748de673SAkira Fujita } 1205748de673SAkira Fujita } 1206748de673SAkira Fujita seq_start = block_start; 1207748de673SAkira Fujita 1208748de673SAkira Fujita /* No blocks within the specified range. */ 1209748de673SAkira Fujita if (le32_to_cpu(ext_cur->ee_block) > block_end) { 1210748de673SAkira Fujita ext4_debug("ext4 move extent: The specified range of file " 1211748de673SAkira Fujita "may be the hole\n"); 1212748de673SAkira Fujita ret = -EINVAL; 1213748de673SAkira Fujita goto out; 1214748de673SAkira Fujita } 1215748de673SAkira Fujita 1216748de673SAkira Fujita /* Adjust start blocks */ 1217748de673SAkira Fujita add_blocks = min(le32_to_cpu(ext_cur->ee_block) + 1218748de673SAkira Fujita ext4_ext_get_actual_len(ext_cur), block_end + 1) - 1219748de673SAkira Fujita max(le32_to_cpu(ext_cur->ee_block), block_start); 1220748de673SAkira Fujita 1221748de673SAkira Fujita while (!last_extent && le32_to_cpu(ext_cur->ee_block) <= block_end) { 1222748de673SAkira Fujita seq_blocks += add_blocks; 1223748de673SAkira Fujita 1224748de673SAkira Fujita /* Adjust tail blocks */ 1225748de673SAkira Fujita if (seq_start + seq_blocks - 1 > block_end) 1226748de673SAkira Fujita seq_blocks = block_end - seq_start + 1; 1227748de673SAkira Fujita 1228748de673SAkira Fujita ext_prev = ext_cur; 1229748de673SAkira Fujita last_extent = mext_next_extent(orig_inode, holecheck_path, 1230748de673SAkira Fujita &ext_cur); 1231748de673SAkira Fujita if (last_extent < 0) { 1232748de673SAkira Fujita ret = last_extent; 1233748de673SAkira Fujita break; 1234748de673SAkira Fujita } 1235748de673SAkira Fujita add_blocks = ext4_ext_get_actual_len(ext_cur); 1236748de673SAkira Fujita 1237748de673SAkira Fujita /* 1238748de673SAkira Fujita * Extend the length of contiguous block (seq_blocks) 1239748de673SAkira Fujita * if extents are contiguous. 1240748de673SAkira Fujita */ 1241748de673SAkira Fujita if (ext4_can_extents_be_merged(orig_inode, 1242748de673SAkira Fujita ext_prev, ext_cur) && 1243748de673SAkira Fujita block_end >= le32_to_cpu(ext_cur->ee_block) && 1244748de673SAkira Fujita !last_extent) 1245748de673SAkira Fujita continue; 1246748de673SAkira Fujita 1247748de673SAkira Fujita /* Is original extent is uninitialized */ 1248748de673SAkira Fujita uninit = ext4_ext_is_uninitialized(ext_prev); 1249748de673SAkira Fujita 1250748de673SAkira Fujita data_offset_in_page = seq_start % blocks_per_page; 1251748de673SAkira Fujita 1252748de673SAkira Fujita /* 1253748de673SAkira Fujita * Calculate data blocks count that should be swapped 1254748de673SAkira Fujita * at the first page. 1255748de673SAkira Fujita */ 1256748de673SAkira Fujita if (data_offset_in_page + seq_blocks > blocks_per_page) { 1257748de673SAkira Fujita /* Swapped blocks are across pages */ 1258748de673SAkira Fujita block_len_in_page = 1259748de673SAkira Fujita blocks_per_page - data_offset_in_page; 1260748de673SAkira Fujita } else { 1261748de673SAkira Fujita /* Swapped blocks are in a page */ 1262748de673SAkira Fujita block_len_in_page = seq_blocks; 1263748de673SAkira Fujita } 1264748de673SAkira Fujita 1265748de673SAkira Fujita orig_page_offset = seq_start >> 1266748de673SAkira Fujita (PAGE_CACHE_SHIFT - orig_inode->i_blkbits); 1267748de673SAkira Fujita seq_end_page = (seq_start + seq_blocks - 1) >> 1268748de673SAkira Fujita (PAGE_CACHE_SHIFT - orig_inode->i_blkbits); 1269748de673SAkira Fujita seq_start = le32_to_cpu(ext_cur->ee_block); 1270748de673SAkira Fujita rest_blocks = seq_blocks; 1271748de673SAkira Fujita 1272748de673SAkira Fujita /* Discard preallocations of two inodes */ 1273748de673SAkira Fujita down_write(&EXT4_I(orig_inode)->i_data_sem); 1274748de673SAkira Fujita ext4_discard_preallocations(orig_inode); 1275748de673SAkira Fujita up_write(&EXT4_I(orig_inode)->i_data_sem); 1276748de673SAkira Fujita 1277748de673SAkira Fujita down_write(&EXT4_I(donor_inode)->i_data_sem); 1278748de673SAkira Fujita ext4_discard_preallocations(donor_inode); 1279748de673SAkira Fujita up_write(&EXT4_I(donor_inode)->i_data_sem); 1280748de673SAkira Fujita 1281748de673SAkira Fujita while (orig_page_offset <= seq_end_page) { 1282748de673SAkira Fujita 1283748de673SAkira Fujita /* Swap original branches with new branches */ 128444fc48f7SAkira Fujita ret = move_extent_per_page(o_filp, donor_inode, 1285748de673SAkira Fujita orig_page_offset, 1286748de673SAkira Fujita data_offset_in_page, 1287748de673SAkira Fujita block_len_in_page, uninit); 1288748de673SAkira Fujita if (ret < 0) 1289748de673SAkira Fujita goto out; 1290748de673SAkira Fujita orig_page_offset++; 1291748de673SAkira Fujita /* Count how many blocks we have exchanged */ 1292748de673SAkira Fujita *moved_len += block_len_in_page; 1293748de673SAkira Fujita BUG_ON(*moved_len > len); 1294748de673SAkira Fujita 1295748de673SAkira Fujita data_offset_in_page = 0; 1296748de673SAkira Fujita rest_blocks -= block_len_in_page; 1297748de673SAkira Fujita if (rest_blocks > blocks_per_page) 1298748de673SAkira Fujita block_len_in_page = blocks_per_page; 1299748de673SAkira Fujita else 1300748de673SAkira Fujita block_len_in_page = rest_blocks; 1301748de673SAkira Fujita } 1302748de673SAkira Fujita 1303748de673SAkira Fujita /* Decrease buffer counter */ 1304748de673SAkira Fujita if (holecheck_path) 1305748de673SAkira Fujita ext4_ext_drop_refs(holecheck_path); 1306e8505970SAkira Fujita ret = get_ext_path(orig_inode, seq_start, &holecheck_path); 1307748de673SAkira Fujita if (holecheck_path == NULL) 1308748de673SAkira Fujita break; 1309748de673SAkira Fujita depth = holecheck_path->p_depth; 1310748de673SAkira Fujita 1311748de673SAkira Fujita /* Decrease buffer counter */ 1312748de673SAkira Fujita if (orig_path) 1313748de673SAkira Fujita ext4_ext_drop_refs(orig_path); 1314e8505970SAkira Fujita ret = get_ext_path(orig_inode, seq_start, &orig_path); 1315748de673SAkira Fujita if (orig_path == NULL) 1316748de673SAkira Fujita break; 1317748de673SAkira Fujita 1318748de673SAkira Fujita ext_cur = holecheck_path[depth].p_ext; 1319748de673SAkira Fujita add_blocks = ext4_ext_get_actual_len(ext_cur); 1320748de673SAkira Fujita seq_blocks = 0; 1321748de673SAkira Fujita 1322748de673SAkira Fujita } 1323748de673SAkira Fujita out: 1324748de673SAkira Fujita if (orig_path) { 1325748de673SAkira Fujita ext4_ext_drop_refs(orig_path); 1326748de673SAkira Fujita kfree(orig_path); 1327748de673SAkira Fujita } 1328748de673SAkira Fujita if (holecheck_path) { 1329748de673SAkira Fujita ext4_ext_drop_refs(holecheck_path); 1330748de673SAkira Fujita kfree(holecheck_path); 1331748de673SAkira Fujita } 1332748de673SAkira Fujita out2: 1333748de673SAkira Fujita mext_inode_double_unlock(orig_inode, donor_inode); 1334748de673SAkira Fujita 1335748de673SAkira Fujita if (ret) 1336748de673SAkira Fujita return ret; 1337748de673SAkira Fujita 1338748de673SAkira Fujita return 0; 1339748de673SAkira Fujita } 1340