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> 185a0e3ad6STejun Heo #include <linux/slab.h> 19748de673SAkira Fujita #include "ext4_jbd2.h" 20748de673SAkira Fujita #include "ext4.h" 214a092d73STheodore Ts'o #include "ext4_extents.h" 22748de673SAkira Fujita 23e8505970SAkira Fujita /** 24e8505970SAkira Fujita * get_ext_path - Find an extent path for designated logical block number. 25e8505970SAkira Fujita * 26e8505970SAkira Fujita * @inode: an inode which is searched 27e8505970SAkira Fujita * @lblock: logical block number to find an extent path 28e8505970SAkira Fujita * @path: pointer to an extent path pointer (for output) 29e8505970SAkira Fujita * 30e8505970SAkira Fujita * ext4_ext_find_extent wrapper. Return 0 on success, or a negative error value 31e8505970SAkira Fujita * on failure. 32e8505970SAkira Fujita */ 33e8505970SAkira Fujita static inline int 34e8505970SAkira Fujita get_ext_path(struct inode *inode, ext4_lblk_t lblock, 350e401101SDmitry Monakhov struct ext4_ext_path **orig_path) 36e8505970SAkira Fujita { 37e8505970SAkira Fujita int ret = 0; 380e401101SDmitry Monakhov struct ext4_ext_path *path; 39e8505970SAkira Fujita 400e401101SDmitry Monakhov path = ext4_ext_find_extent(inode, lblock, *orig_path); 410e401101SDmitry Monakhov if (IS_ERR(path)) 420e401101SDmitry Monakhov ret = PTR_ERR(path); 430e401101SDmitry Monakhov else if (path[ext_depth(inode)].p_ext == NULL) 44347fa6f1SAkira Fujita ret = -ENODATA; 450e401101SDmitry Monakhov else 460e401101SDmitry Monakhov *orig_path = path; 47347fa6f1SAkira Fujita 48e8505970SAkira Fujita return ret; 49e8505970SAkira Fujita } 50748de673SAkira Fujita 51748de673SAkira Fujita /** 52748de673SAkira Fujita * copy_extent_status - Copy the extent's initialization status 53748de673SAkira Fujita * 54748de673SAkira Fujita * @src: an extent for getting initialize status 55748de673SAkira Fujita * @dest: an extent to be set the status 56748de673SAkira Fujita */ 57748de673SAkira Fujita static void 58748de673SAkira Fujita copy_extent_status(struct ext4_extent *src, struct ext4_extent *dest) 59748de673SAkira Fujita { 60748de673SAkira Fujita if (ext4_ext_is_uninitialized(src)) 61748de673SAkira Fujita ext4_ext_mark_uninitialized(dest); 62748de673SAkira Fujita else 63748de673SAkira Fujita dest->ee_len = cpu_to_le16(ext4_ext_get_actual_len(dest)); 64748de673SAkira Fujita } 65748de673SAkira Fujita 66748de673SAkira Fujita /** 67748de673SAkira Fujita * mext_next_extent - Search for the next extent and set it to "extent" 68748de673SAkira Fujita * 69748de673SAkira Fujita * @inode: inode which is searched 70748de673SAkira Fujita * @path: this will obtain data for the next extent 71748de673SAkira Fujita * @extent: pointer to the next extent we have just gotten 72748de673SAkira Fujita * 73748de673SAkira Fujita * Search the next extent in the array of ext4_ext_path structure (@path) 74748de673SAkira Fujita * and set it to ext4_extent structure (@extent). In addition, the member of 75748de673SAkira Fujita * @path (->p_ext) also points the next extent. Return 0 on success, 1 if 76748de673SAkira Fujita * ext4_ext_path structure refers to the last extent, or a negative error 77748de673SAkira Fujita * value on failure. 78748de673SAkira Fujita */ 79748de673SAkira Fujita static int 80748de673SAkira Fujita mext_next_extent(struct inode *inode, struct ext4_ext_path *path, 81748de673SAkira Fujita struct ext4_extent **extent) 82748de673SAkira Fujita { 83fc04cb49SAkira Fujita struct ext4_extent_header *eh; 84748de673SAkira Fujita int ppos, leaf_ppos = path->p_depth; 85748de673SAkira Fujita 86748de673SAkira Fujita ppos = leaf_ppos; 87748de673SAkira Fujita if (EXT_LAST_EXTENT(path[ppos].p_hdr) > path[ppos].p_ext) { 88748de673SAkira Fujita /* leaf block */ 89748de673SAkira Fujita *extent = ++path[ppos].p_ext; 90bf89d16fSTheodore Ts'o path[ppos].p_block = ext4_ext_pblock(path[ppos].p_ext); 91748de673SAkira Fujita return 0; 92748de673SAkira Fujita } 93748de673SAkira Fujita 94748de673SAkira Fujita while (--ppos >= 0) { 95748de673SAkira Fujita if (EXT_LAST_INDEX(path[ppos].p_hdr) > 96748de673SAkira Fujita path[ppos].p_idx) { 97748de673SAkira Fujita int cur_ppos = ppos; 98748de673SAkira Fujita 99748de673SAkira Fujita /* index block */ 100748de673SAkira Fujita path[ppos].p_idx++; 101bf89d16fSTheodore Ts'o path[ppos].p_block = ext4_idx_pblock(path[ppos].p_idx); 102748de673SAkira Fujita if (path[ppos+1].p_bh) 103748de673SAkira Fujita brelse(path[ppos+1].p_bh); 104748de673SAkira Fujita path[ppos+1].p_bh = 105748de673SAkira Fujita sb_bread(inode->i_sb, path[ppos].p_block); 106748de673SAkira Fujita if (!path[ppos+1].p_bh) 107748de673SAkira Fujita return -EIO; 108748de673SAkira Fujita path[ppos+1].p_hdr = 109748de673SAkira Fujita ext_block_hdr(path[ppos+1].p_bh); 110748de673SAkira Fujita 111748de673SAkira Fujita /* Halfway index block */ 112748de673SAkira Fujita while (++cur_ppos < leaf_ppos) { 113748de673SAkira Fujita path[cur_ppos].p_idx = 114748de673SAkira Fujita EXT_FIRST_INDEX(path[cur_ppos].p_hdr); 115748de673SAkira Fujita path[cur_ppos].p_block = 116bf89d16fSTheodore Ts'o ext4_idx_pblock(path[cur_ppos].p_idx); 117748de673SAkira Fujita if (path[cur_ppos+1].p_bh) 118748de673SAkira Fujita brelse(path[cur_ppos+1].p_bh); 119748de673SAkira Fujita path[cur_ppos+1].p_bh = sb_bread(inode->i_sb, 120748de673SAkira Fujita path[cur_ppos].p_block); 121748de673SAkira Fujita if (!path[cur_ppos+1].p_bh) 122748de673SAkira Fujita return -EIO; 123748de673SAkira Fujita path[cur_ppos+1].p_hdr = 124748de673SAkira Fujita ext_block_hdr(path[cur_ppos+1].p_bh); 125748de673SAkira Fujita } 126748de673SAkira Fujita 127fc04cb49SAkira Fujita path[leaf_ppos].p_ext = *extent = NULL; 128fc04cb49SAkira Fujita 129fc04cb49SAkira Fujita eh = path[leaf_ppos].p_hdr; 130fc04cb49SAkira Fujita if (le16_to_cpu(eh->eh_entries) == 0) 131fc04cb49SAkira Fujita /* empty leaf is found */ 132fc04cb49SAkira Fujita return -ENODATA; 133fc04cb49SAkira Fujita 134748de673SAkira Fujita /* leaf block */ 135748de673SAkira Fujita path[leaf_ppos].p_ext = *extent = 136748de673SAkira Fujita EXT_FIRST_EXTENT(path[leaf_ppos].p_hdr); 137fc04cb49SAkira Fujita path[leaf_ppos].p_block = 138bf89d16fSTheodore Ts'o ext4_ext_pblock(path[leaf_ppos].p_ext); 139748de673SAkira Fujita return 0; 140748de673SAkira Fujita } 141748de673SAkira Fujita } 142748de673SAkira Fujita /* We found the last extent */ 143748de673SAkira Fujita return 1; 144748de673SAkira Fujita } 145748de673SAkira Fujita 146748de673SAkira Fujita /** 147393d1d1dSDr. Tilmann Bubeck * ext4_double_down_write_data_sem - Acquire two inodes' write lock 148393d1d1dSDr. Tilmann Bubeck * of i_data_sem 149748de673SAkira Fujita * 15003bd8b9bSDmitry Monakhov * Acquire write lock of i_data_sem of the two inodes 151748de673SAkira Fujita */ 152393d1d1dSDr. Tilmann Bubeck void 153393d1d1dSDr. Tilmann Bubeck ext4_double_down_write_data_sem(struct inode *first, struct inode *second) 154748de673SAkira Fujita { 15503bd8b9bSDmitry Monakhov if (first < second) { 156748de673SAkira Fujita down_write(&EXT4_I(first)->i_data_sem); 15749bd22bcSAkira Fujita down_write_nested(&EXT4_I(second)->i_data_sem, SINGLE_DEPTH_NESTING); 15803bd8b9bSDmitry Monakhov } else { 15903bd8b9bSDmitry Monakhov down_write(&EXT4_I(second)->i_data_sem); 16003bd8b9bSDmitry Monakhov down_write_nested(&EXT4_I(first)->i_data_sem, SINGLE_DEPTH_NESTING); 16103bd8b9bSDmitry Monakhov 16203bd8b9bSDmitry Monakhov } 163748de673SAkira Fujita } 164748de673SAkira Fujita 165748de673SAkira Fujita /** 166393d1d1dSDr. Tilmann Bubeck * ext4_double_up_write_data_sem - Release two inodes' write lock of i_data_sem 167748de673SAkira Fujita * 168748de673SAkira Fujita * @orig_inode: original inode structure to be released its lock first 169748de673SAkira Fujita * @donor_inode: donor inode structure to be released its lock second 170fc04cb49SAkira Fujita * Release write lock of i_data_sem of two inodes (orig and donor). 171748de673SAkira Fujita */ 172393d1d1dSDr. Tilmann Bubeck void 173393d1d1dSDr. Tilmann Bubeck ext4_double_up_write_data_sem(struct inode *orig_inode, 174393d1d1dSDr. Tilmann Bubeck struct inode *donor_inode) 175748de673SAkira Fujita { 176748de673SAkira Fujita up_write(&EXT4_I(orig_inode)->i_data_sem); 177748de673SAkira Fujita up_write(&EXT4_I(donor_inode)->i_data_sem); 178748de673SAkira Fujita } 179748de673SAkira Fujita 180748de673SAkira Fujita /** 181748de673SAkira Fujita * mext_insert_across_blocks - Insert extents across leaf block 182748de673SAkira Fujita * 183748de673SAkira Fujita * @handle: journal handle 184748de673SAkira Fujita * @orig_inode: original inode 185748de673SAkira Fujita * @o_start: first original extent to be changed 186748de673SAkira Fujita * @o_end: last original extent to be changed 187748de673SAkira Fujita * @start_ext: first new extent to be inserted 188748de673SAkira Fujita * @new_ext: middle of new extent to be inserted 189748de673SAkira Fujita * @end_ext: last new extent to be inserted 190748de673SAkira Fujita * 191748de673SAkira Fujita * Allocate a new leaf block and insert extents into it. Return 0 on success, 192748de673SAkira Fujita * or a negative error value on failure. 193748de673SAkira Fujita */ 194748de673SAkira Fujita static int 195748de673SAkira Fujita mext_insert_across_blocks(handle_t *handle, struct inode *orig_inode, 196748de673SAkira Fujita struct ext4_extent *o_start, struct ext4_extent *o_end, 197748de673SAkira Fujita struct ext4_extent *start_ext, struct ext4_extent *new_ext, 198748de673SAkira Fujita struct ext4_extent *end_ext) 199748de673SAkira Fujita { 200748de673SAkira Fujita struct ext4_ext_path *orig_path = NULL; 201748de673SAkira Fujita ext4_lblk_t eblock = 0; 202748de673SAkira Fujita int new_flag = 0; 203748de673SAkira Fujita int end_flag = 0; 204748de673SAkira Fujita int err = 0; 205748de673SAkira Fujita 206748de673SAkira Fujita if (start_ext->ee_len && new_ext->ee_len && end_ext->ee_len) { 207748de673SAkira Fujita if (o_start == o_end) { 208748de673SAkira Fujita 209748de673SAkira Fujita /* start_ext new_ext end_ext 210748de673SAkira Fujita * donor |---------|-----------|--------| 211748de673SAkira Fujita * orig |------------------------------| 212748de673SAkira Fujita */ 213748de673SAkira Fujita end_flag = 1; 214748de673SAkira Fujita } else { 215748de673SAkira Fujita 216748de673SAkira Fujita /* start_ext new_ext end_ext 217748de673SAkira Fujita * donor |---------|----------|---------| 218748de673SAkira Fujita * orig |---------------|--------------| 219748de673SAkira Fujita */ 220748de673SAkira Fujita o_end->ee_block = end_ext->ee_block; 221748de673SAkira Fujita o_end->ee_len = end_ext->ee_len; 222bf89d16fSTheodore Ts'o ext4_ext_store_pblock(o_end, ext4_ext_pblock(end_ext)); 223748de673SAkira Fujita } 224748de673SAkira Fujita 225748de673SAkira Fujita o_start->ee_len = start_ext->ee_len; 2265fd5249aSAkira Fujita eblock = le32_to_cpu(start_ext->ee_block); 227748de673SAkira Fujita new_flag = 1; 228748de673SAkira Fujita 229748de673SAkira Fujita } else if (start_ext->ee_len && new_ext->ee_len && 230748de673SAkira Fujita !end_ext->ee_len && o_start == o_end) { 231748de673SAkira Fujita 232748de673SAkira Fujita /* start_ext new_ext 233748de673SAkira Fujita * donor |--------------|---------------| 234748de673SAkira Fujita * orig |------------------------------| 235748de673SAkira Fujita */ 236748de673SAkira Fujita o_start->ee_len = start_ext->ee_len; 2375fd5249aSAkira Fujita eblock = le32_to_cpu(start_ext->ee_block); 238748de673SAkira Fujita new_flag = 1; 239748de673SAkira Fujita 240748de673SAkira Fujita } else if (!start_ext->ee_len && new_ext->ee_len && 241748de673SAkira Fujita end_ext->ee_len && o_start == o_end) { 242748de673SAkira Fujita 243748de673SAkira Fujita /* new_ext end_ext 244748de673SAkira Fujita * donor |--------------|---------------| 245748de673SAkira Fujita * orig |------------------------------| 246748de673SAkira Fujita */ 247748de673SAkira Fujita o_end->ee_block = end_ext->ee_block; 248748de673SAkira Fujita o_end->ee_len = end_ext->ee_len; 249bf89d16fSTheodore Ts'o ext4_ext_store_pblock(o_end, ext4_ext_pblock(end_ext)); 250748de673SAkira Fujita 251748de673SAkira Fujita /* 252748de673SAkira Fujita * Set 0 to the extent block if new_ext was 253748de673SAkira Fujita * the first block. 254748de673SAkira Fujita */ 255748de673SAkira Fujita if (new_ext->ee_block) 256748de673SAkira Fujita eblock = le32_to_cpu(new_ext->ee_block); 257748de673SAkira Fujita 258748de673SAkira Fujita new_flag = 1; 259748de673SAkira Fujita } else { 260748de673SAkira Fujita ext4_debug("ext4 move extent: Unexpected insert case\n"); 261748de673SAkira Fujita return -EIO; 262748de673SAkira Fujita } 263748de673SAkira Fujita 264748de673SAkira Fujita if (new_flag) { 265e8505970SAkira Fujita err = get_ext_path(orig_inode, eblock, &orig_path); 266347fa6f1SAkira Fujita if (err) 267748de673SAkira Fujita goto out; 268748de673SAkira Fujita 269748de673SAkira Fujita if (ext4_ext_insert_extent(handle, orig_inode, 2700031462bSMingming Cao orig_path, new_ext, 0)) 271748de673SAkira Fujita goto out; 272748de673SAkira Fujita } 273748de673SAkira Fujita 274748de673SAkira Fujita if (end_flag) { 275e8505970SAkira Fujita err = get_ext_path(orig_inode, 276e8505970SAkira Fujita le32_to_cpu(end_ext->ee_block) - 1, &orig_path); 277347fa6f1SAkira Fujita if (err) 278748de673SAkira Fujita goto out; 279748de673SAkira Fujita 280748de673SAkira Fujita if (ext4_ext_insert_extent(handle, orig_inode, 2810031462bSMingming Cao orig_path, end_ext, 0)) 282748de673SAkira Fujita goto out; 283748de673SAkira Fujita } 284748de673SAkira Fujita out: 285748de673SAkira Fujita if (orig_path) { 286748de673SAkira Fujita ext4_ext_drop_refs(orig_path); 287748de673SAkira Fujita kfree(orig_path); 288748de673SAkira Fujita } 289748de673SAkira Fujita 290748de673SAkira Fujita return err; 291748de673SAkira Fujita 292748de673SAkira Fujita } 293748de673SAkira Fujita 294748de673SAkira Fujita /** 295748de673SAkira Fujita * mext_insert_inside_block - Insert new extent to the extent block 296748de673SAkira Fujita * 297748de673SAkira Fujita * @o_start: first original extent to be moved 298748de673SAkira Fujita * @o_end: last original extent to be moved 299748de673SAkira Fujita * @start_ext: first new extent to be inserted 300748de673SAkira Fujita * @new_ext: middle of new extent to be inserted 301748de673SAkira Fujita * @end_ext: last new extent to be inserted 302748de673SAkira Fujita * @eh: extent header of target leaf block 303748de673SAkira Fujita * @range_to_move: used to decide how to insert extent 304748de673SAkira Fujita * 305748de673SAkira Fujita * Insert extents into the leaf block. The extent (@o_start) is overwritten 306748de673SAkira Fujita * by inserted extents. 307748de673SAkira Fujita */ 308748de673SAkira Fujita static void 309748de673SAkira Fujita mext_insert_inside_block(struct ext4_extent *o_start, 310748de673SAkira Fujita struct ext4_extent *o_end, 311748de673SAkira Fujita struct ext4_extent *start_ext, 312748de673SAkira Fujita struct ext4_extent *new_ext, 313748de673SAkira Fujita struct ext4_extent *end_ext, 314748de673SAkira Fujita struct ext4_extent_header *eh, 315748de673SAkira Fujita int range_to_move) 316748de673SAkira Fujita { 317748de673SAkira Fujita int i = 0; 318748de673SAkira Fujita unsigned long len; 319748de673SAkira Fujita 320748de673SAkira Fujita /* Move the existing extents */ 321748de673SAkira Fujita if (range_to_move && o_end < EXT_LAST_EXTENT(eh)) { 322748de673SAkira Fujita len = (unsigned long)(EXT_LAST_EXTENT(eh) + 1) - 323748de673SAkira Fujita (unsigned long)(o_end + 1); 324748de673SAkira Fujita memmove(o_end + 1 + range_to_move, o_end + 1, len); 325748de673SAkira Fujita } 326748de673SAkira Fujita 327748de673SAkira Fujita /* Insert start entry */ 328748de673SAkira Fujita if (start_ext->ee_len) 329748de673SAkira Fujita o_start[i++].ee_len = start_ext->ee_len; 330748de673SAkira Fujita 331748de673SAkira Fujita /* Insert new entry */ 332748de673SAkira Fujita if (new_ext->ee_len) { 333748de673SAkira Fujita o_start[i] = *new_ext; 334bf89d16fSTheodore Ts'o ext4_ext_store_pblock(&o_start[i++], ext4_ext_pblock(new_ext)); 335748de673SAkira Fujita } 336748de673SAkira Fujita 337748de673SAkira Fujita /* Insert end entry */ 338748de673SAkira Fujita if (end_ext->ee_len) 339748de673SAkira Fujita o_start[i] = *end_ext; 340748de673SAkira Fujita 341748de673SAkira Fujita /* Increment the total entries counter on the extent block */ 342748de673SAkira Fujita le16_add_cpu(&eh->eh_entries, range_to_move); 343748de673SAkira Fujita } 344748de673SAkira Fujita 345748de673SAkira Fujita /** 346748de673SAkira Fujita * mext_insert_extents - Insert new extent 347748de673SAkira Fujita * 348748de673SAkira Fujita * @handle: journal handle 349748de673SAkira Fujita * @orig_inode: original inode 350748de673SAkira Fujita * @orig_path: path indicates first extent to be changed 351748de673SAkira Fujita * @o_start: first original extent to be changed 352748de673SAkira Fujita * @o_end: last original extent to be changed 353748de673SAkira Fujita * @start_ext: first new extent to be inserted 354748de673SAkira Fujita * @new_ext: middle of new extent to be inserted 355748de673SAkira Fujita * @end_ext: last new extent to be inserted 356748de673SAkira Fujita * 357748de673SAkira Fujita * Call the function to insert extents. If we cannot add more extents into 358748de673SAkira Fujita * the leaf block, we call mext_insert_across_blocks() to create a 359748de673SAkira Fujita * new leaf block. Otherwise call mext_insert_inside_block(). Return 0 360748de673SAkira Fujita * on success, or a negative error value on failure. 361748de673SAkira Fujita */ 362748de673SAkira Fujita static int 363748de673SAkira Fujita mext_insert_extents(handle_t *handle, struct inode *orig_inode, 364748de673SAkira Fujita struct ext4_ext_path *orig_path, 365748de673SAkira Fujita struct ext4_extent *o_start, 366748de673SAkira Fujita struct ext4_extent *o_end, 367748de673SAkira Fujita struct ext4_extent *start_ext, 368748de673SAkira Fujita struct ext4_extent *new_ext, 369748de673SAkira Fujita struct ext4_extent *end_ext) 370748de673SAkira Fujita { 371748de673SAkira Fujita struct ext4_extent_header *eh; 372748de673SAkira Fujita unsigned long need_slots, slots_range; 373748de673SAkira Fujita int range_to_move, depth, ret; 374748de673SAkira Fujita 375748de673SAkira Fujita /* 376748de673SAkira Fujita * The extents need to be inserted 377748de673SAkira Fujita * start_extent + new_extent + end_extent. 378748de673SAkira Fujita */ 379748de673SAkira Fujita need_slots = (start_ext->ee_len ? 1 : 0) + (end_ext->ee_len ? 1 : 0) + 380748de673SAkira Fujita (new_ext->ee_len ? 1 : 0); 381748de673SAkira Fujita 382748de673SAkira Fujita /* The number of slots between start and end */ 383748de673SAkira Fujita slots_range = ((unsigned long)(o_end + 1) - (unsigned long)o_start + 1) 384748de673SAkira Fujita / sizeof(struct ext4_extent); 385748de673SAkira Fujita 386748de673SAkira Fujita /* Range to move the end of extent */ 387748de673SAkira Fujita range_to_move = need_slots - slots_range; 388748de673SAkira Fujita depth = orig_path->p_depth; 389748de673SAkira Fujita orig_path += depth; 390748de673SAkira Fujita eh = orig_path->p_hdr; 391748de673SAkira Fujita 392748de673SAkira Fujita if (depth) { 393748de673SAkira Fujita /* Register to journal */ 394748de673SAkira Fujita ret = ext4_journal_get_write_access(handle, orig_path->p_bh); 395748de673SAkira Fujita if (ret) 396748de673SAkira Fujita return ret; 397748de673SAkira Fujita } 398748de673SAkira Fujita 399748de673SAkira Fujita /* Expansion */ 400748de673SAkira Fujita if (range_to_move > 0 && 401748de673SAkira Fujita (range_to_move > le16_to_cpu(eh->eh_max) 402748de673SAkira Fujita - le16_to_cpu(eh->eh_entries))) { 403748de673SAkira Fujita 404748de673SAkira Fujita ret = mext_insert_across_blocks(handle, orig_inode, o_start, 405748de673SAkira Fujita o_end, start_ext, new_ext, end_ext); 406748de673SAkira Fujita if (ret < 0) 407748de673SAkira Fujita return ret; 408748de673SAkira Fujita } else 409748de673SAkira Fujita mext_insert_inside_block(o_start, o_end, start_ext, new_ext, 410748de673SAkira Fujita end_ext, eh, range_to_move); 411748de673SAkira Fujita 412748de673SAkira Fujita if (depth) { 413748de673SAkira Fujita ret = ext4_handle_dirty_metadata(handle, orig_inode, 414748de673SAkira Fujita orig_path->p_bh); 415748de673SAkira Fujita if (ret) 416748de673SAkira Fujita return ret; 417748de673SAkira Fujita } else { 418748de673SAkira Fujita ret = ext4_mark_inode_dirty(handle, orig_inode); 419748de673SAkira Fujita if (ret < 0) 420748de673SAkira Fujita return ret; 421748de673SAkira Fujita } 422748de673SAkira Fujita 423748de673SAkira Fujita return 0; 424748de673SAkira Fujita } 425748de673SAkira Fujita 426748de673SAkira Fujita /** 427748de673SAkira Fujita * mext_leaf_block - Move one leaf extent block into the inode. 428748de673SAkira Fujita * 429748de673SAkira Fujita * @handle: journal handle 430748de673SAkira Fujita * @orig_inode: original inode 431748de673SAkira Fujita * @orig_path: path indicates first extent to be changed 432748de673SAkira Fujita * @dext: donor extent 433748de673SAkira Fujita * @from: start offset on the target file 434748de673SAkira Fujita * 435748de673SAkira Fujita * In order to insert extents into the leaf block, we must divide the extent 436748de673SAkira Fujita * in the leaf block into three extents. The one is located to be inserted 437748de673SAkira Fujita * extents, and the others are located around it. 438748de673SAkira Fujita * 439748de673SAkira Fujita * Therefore, this function creates structures to save extents of the leaf 440748de673SAkira Fujita * block, and inserts extents by calling mext_insert_extents() with 441748de673SAkira Fujita * created extents. Return 0 on success, or a negative error value on failure. 442748de673SAkira Fujita */ 443748de673SAkira Fujita static int 444748de673SAkira Fujita mext_leaf_block(handle_t *handle, struct inode *orig_inode, 445748de673SAkira Fujita struct ext4_ext_path *orig_path, struct ext4_extent *dext, 446748de673SAkira Fujita ext4_lblk_t *from) 447748de673SAkira Fujita { 448748de673SAkira Fujita struct ext4_extent *oext, *o_start, *o_end, *prev_ext; 449748de673SAkira Fujita struct ext4_extent new_ext, start_ext, end_ext; 450748de673SAkira Fujita ext4_lblk_t new_ext_end; 451748de673SAkira Fujita int oext_alen, new_ext_alen, end_ext_alen; 452748de673SAkira Fujita int depth = ext_depth(orig_inode); 453748de673SAkira Fujita int ret; 454748de673SAkira Fujita 455c26d0badSSteven Liu start_ext.ee_block = end_ext.ee_block = 0; 456748de673SAkira Fujita o_start = o_end = oext = orig_path[depth].p_ext; 457748de673SAkira Fujita oext_alen = ext4_ext_get_actual_len(oext); 458748de673SAkira Fujita start_ext.ee_len = end_ext.ee_len = 0; 459748de673SAkira Fujita 460748de673SAkira Fujita new_ext.ee_block = cpu_to_le32(*from); 461bf89d16fSTheodore Ts'o ext4_ext_store_pblock(&new_ext, ext4_ext_pblock(dext)); 462748de673SAkira Fujita new_ext.ee_len = dext->ee_len; 463748de673SAkira Fujita new_ext_alen = ext4_ext_get_actual_len(&new_ext); 464748de673SAkira Fujita new_ext_end = le32_to_cpu(new_ext.ee_block) + new_ext_alen - 1; 465748de673SAkira Fujita 466748de673SAkira Fujita /* 467748de673SAkira Fujita * Case: original extent is first 468748de673SAkira Fujita * oext |--------| 469748de673SAkira Fujita * new_ext |--| 470748de673SAkira Fujita * start_ext |--| 471748de673SAkira Fujita */ 472748de673SAkira Fujita if (le32_to_cpu(oext->ee_block) < le32_to_cpu(new_ext.ee_block) && 473748de673SAkira Fujita le32_to_cpu(new_ext.ee_block) < 474748de673SAkira Fujita le32_to_cpu(oext->ee_block) + oext_alen) { 475748de673SAkira Fujita start_ext.ee_len = cpu_to_le16(le32_to_cpu(new_ext.ee_block) - 476748de673SAkira Fujita le32_to_cpu(oext->ee_block)); 4775fd5249aSAkira Fujita start_ext.ee_block = oext->ee_block; 478748de673SAkira Fujita copy_extent_status(oext, &start_ext); 479748de673SAkira Fujita } else if (oext > EXT_FIRST_EXTENT(orig_path[depth].p_hdr)) { 480748de673SAkira Fujita prev_ext = oext - 1; 481748de673SAkira Fujita /* 482748de673SAkira Fujita * We can merge new_ext into previous extent, 483748de673SAkira Fujita * if these are contiguous and same extent type. 484748de673SAkira Fujita */ 485748de673SAkira Fujita if (ext4_can_extents_be_merged(orig_inode, prev_ext, 486748de673SAkira Fujita &new_ext)) { 487748de673SAkira Fujita o_start = prev_ext; 488748de673SAkira Fujita start_ext.ee_len = cpu_to_le16( 489748de673SAkira Fujita ext4_ext_get_actual_len(prev_ext) + 490748de673SAkira Fujita new_ext_alen); 4915fd5249aSAkira Fujita start_ext.ee_block = oext->ee_block; 492748de673SAkira Fujita copy_extent_status(prev_ext, &start_ext); 493748de673SAkira Fujita new_ext.ee_len = 0; 494748de673SAkira Fujita } 495748de673SAkira Fujita } 496748de673SAkira Fujita 497748de673SAkira Fujita /* 498748de673SAkira Fujita * Case: new_ext_end must be less than oext 499748de673SAkira Fujita * oext |-----------| 500748de673SAkira Fujita * new_ext |-------| 501748de673SAkira Fujita */ 5022147b1a6SAkira Fujita if (le32_to_cpu(oext->ee_block) + oext_alen - 1 < new_ext_end) { 50324676da4STheodore Ts'o EXT4_ERROR_INODE(orig_inode, 5042147b1a6SAkira Fujita "new_ext_end(%u) should be less than or equal to " 5052147b1a6SAkira Fujita "oext->ee_block(%u) + oext_alen(%d) - 1", 5062147b1a6SAkira Fujita new_ext_end, le32_to_cpu(oext->ee_block), 5072147b1a6SAkira Fujita oext_alen); 5082147b1a6SAkira Fujita ret = -EIO; 5092147b1a6SAkira Fujita goto out; 5102147b1a6SAkira Fujita } 511748de673SAkira Fujita 512748de673SAkira Fujita /* 513748de673SAkira Fujita * Case: new_ext is smaller than original extent 514748de673SAkira Fujita * oext |---------------| 515748de673SAkira Fujita * new_ext |-----------| 516748de673SAkira Fujita * end_ext |---| 517748de673SAkira Fujita */ 518748de673SAkira Fujita if (le32_to_cpu(oext->ee_block) <= new_ext_end && 519748de673SAkira Fujita new_ext_end < le32_to_cpu(oext->ee_block) + oext_alen - 1) { 520748de673SAkira Fujita end_ext.ee_len = 521748de673SAkira Fujita cpu_to_le16(le32_to_cpu(oext->ee_block) + 522748de673SAkira Fujita oext_alen - 1 - new_ext_end); 523748de673SAkira Fujita copy_extent_status(oext, &end_ext); 524748de673SAkira Fujita end_ext_alen = ext4_ext_get_actual_len(&end_ext); 525748de673SAkira Fujita ext4_ext_store_pblock(&end_ext, 526bf89d16fSTheodore Ts'o (ext4_ext_pblock(o_end) + oext_alen - end_ext_alen)); 527748de673SAkira Fujita end_ext.ee_block = 528748de673SAkira Fujita cpu_to_le32(le32_to_cpu(o_end->ee_block) + 529748de673SAkira Fujita oext_alen - end_ext_alen); 530748de673SAkira Fujita } 531748de673SAkira Fujita 532748de673SAkira Fujita ret = mext_insert_extents(handle, orig_inode, orig_path, o_start, 533748de673SAkira Fujita o_end, &start_ext, &new_ext, &end_ext); 5342147b1a6SAkira Fujita out: 535748de673SAkira Fujita return ret; 536748de673SAkira Fujita } 537748de673SAkira Fujita 538748de673SAkira Fujita /** 539748de673SAkira Fujita * mext_calc_swap_extents - Calculate extents for extent swapping. 540748de673SAkira Fujita * 541748de673SAkira Fujita * @tmp_dext: the extent that will belong to the original inode 542748de673SAkira Fujita * @tmp_oext: the extent that will belong to the donor inode 543748de673SAkira Fujita * @orig_off: block offset of original inode 544748de673SAkira Fujita * @donor_off: block offset of donor inode 54592c28159SAkira Fujita * @max_count: the maximum length of extents 546c40ce3c9SAkira Fujita * 547c40ce3c9SAkira Fujita * Return 0 on success, or a negative error value on failure. 548748de673SAkira Fujita */ 549c40ce3c9SAkira Fujita static int 550748de673SAkira Fujita mext_calc_swap_extents(struct ext4_extent *tmp_dext, 551748de673SAkira Fujita struct ext4_extent *tmp_oext, 552748de673SAkira Fujita ext4_lblk_t orig_off, ext4_lblk_t donor_off, 553748de673SAkira Fujita ext4_lblk_t max_count) 554748de673SAkira Fujita { 555748de673SAkira Fujita ext4_lblk_t diff, orig_diff; 556748de673SAkira Fujita struct ext4_extent dext_old, oext_old; 557748de673SAkira Fujita 558c40ce3c9SAkira Fujita BUG_ON(orig_off != donor_off); 559c40ce3c9SAkira Fujita 560c40ce3c9SAkira Fujita /* original and donor extents have to cover the same block offset */ 561c40ce3c9SAkira Fujita if (orig_off < le32_to_cpu(tmp_oext->ee_block) || 562c40ce3c9SAkira Fujita le32_to_cpu(tmp_oext->ee_block) + 563c40ce3c9SAkira Fujita ext4_ext_get_actual_len(tmp_oext) - 1 < orig_off) 564c40ce3c9SAkira Fujita return -ENODATA; 565c40ce3c9SAkira Fujita 566c40ce3c9SAkira Fujita if (orig_off < le32_to_cpu(tmp_dext->ee_block) || 567c40ce3c9SAkira Fujita le32_to_cpu(tmp_dext->ee_block) + 568c40ce3c9SAkira Fujita ext4_ext_get_actual_len(tmp_dext) - 1 < orig_off) 569c40ce3c9SAkira Fujita return -ENODATA; 570c40ce3c9SAkira Fujita 571748de673SAkira Fujita dext_old = *tmp_dext; 572748de673SAkira Fujita oext_old = *tmp_oext; 573748de673SAkira Fujita 574748de673SAkira Fujita /* When tmp_dext is too large, pick up the target range. */ 575748de673SAkira Fujita diff = donor_off - le32_to_cpu(tmp_dext->ee_block); 576748de673SAkira Fujita 577bf89d16fSTheodore Ts'o ext4_ext_store_pblock(tmp_dext, ext4_ext_pblock(tmp_dext) + diff); 578ba39ebb6SWei Yongjun le32_add_cpu(&tmp_dext->ee_block, diff); 579ba39ebb6SWei Yongjun le16_add_cpu(&tmp_dext->ee_len, -diff); 580748de673SAkira Fujita 581748de673SAkira Fujita if (max_count < ext4_ext_get_actual_len(tmp_dext)) 582748de673SAkira Fujita tmp_dext->ee_len = cpu_to_le16(max_count); 583748de673SAkira Fujita 584748de673SAkira Fujita orig_diff = orig_off - le32_to_cpu(tmp_oext->ee_block); 585bf89d16fSTheodore Ts'o ext4_ext_store_pblock(tmp_oext, ext4_ext_pblock(tmp_oext) + orig_diff); 586748de673SAkira Fujita 587748de673SAkira Fujita /* Adjust extent length if donor extent is larger than orig */ 588748de673SAkira Fujita if (ext4_ext_get_actual_len(tmp_dext) > 589748de673SAkira Fujita ext4_ext_get_actual_len(tmp_oext) - orig_diff) 590748de673SAkira Fujita tmp_dext->ee_len = cpu_to_le16(le16_to_cpu(tmp_oext->ee_len) - 591748de673SAkira Fujita orig_diff); 592748de673SAkira Fujita 593748de673SAkira Fujita tmp_oext->ee_len = cpu_to_le16(ext4_ext_get_actual_len(tmp_dext)); 594748de673SAkira Fujita 595748de673SAkira Fujita copy_extent_status(&oext_old, tmp_dext); 596748de673SAkira Fujita copy_extent_status(&dext_old, tmp_oext); 597c40ce3c9SAkira Fujita 598c40ce3c9SAkira Fujita return 0; 599748de673SAkira Fujita } 600748de673SAkira Fujita 601748de673SAkira Fujita /** 6028c854473SDmitry Monakhov * mext_check_coverage - Check that all extents in range has the same type 6038c854473SDmitry Monakhov * 6048c854473SDmitry Monakhov * @inode: inode in question 6058c854473SDmitry Monakhov * @from: block offset of inode 6068c854473SDmitry Monakhov * @count: block count to be checked 6078c854473SDmitry Monakhov * @uninit: extents expected to be uninitialized 6088c854473SDmitry Monakhov * @err: pointer to save error value 6098c854473SDmitry Monakhov * 6108c854473SDmitry Monakhov * Return 1 if all extents in range has expected type, and zero otherwise. 6118c854473SDmitry Monakhov */ 6128c854473SDmitry Monakhov static int 6138c854473SDmitry Monakhov mext_check_coverage(struct inode *inode, ext4_lblk_t from, ext4_lblk_t count, 6148c854473SDmitry Monakhov int uninit, int *err) 6158c854473SDmitry Monakhov { 6168c854473SDmitry Monakhov struct ext4_ext_path *path = NULL; 6178c854473SDmitry Monakhov struct ext4_extent *ext; 6180e401101SDmitry Monakhov int ret = 0; 6198c854473SDmitry Monakhov ext4_lblk_t last = from + count; 6208c854473SDmitry Monakhov while (from < last) { 6218c854473SDmitry Monakhov *err = get_ext_path(inode, from, &path); 6228c854473SDmitry Monakhov if (*err) 6230e401101SDmitry Monakhov goto out; 6248c854473SDmitry Monakhov ext = path[ext_depth(inode)].p_ext; 6250e401101SDmitry Monakhov if (uninit != ext4_ext_is_uninitialized(ext)) 6260e401101SDmitry Monakhov goto out; 6278c854473SDmitry Monakhov from += ext4_ext_get_actual_len(ext); 6288c854473SDmitry Monakhov ext4_ext_drop_refs(path); 6298c854473SDmitry Monakhov } 6300e401101SDmitry Monakhov ret = 1; 6310e401101SDmitry Monakhov out: 6320e401101SDmitry Monakhov if (path) { 6330e401101SDmitry Monakhov ext4_ext_drop_refs(path); 6340e401101SDmitry Monakhov kfree(path); 6350e401101SDmitry Monakhov } 6360e401101SDmitry Monakhov return ret; 6378c854473SDmitry Monakhov } 6388c854473SDmitry Monakhov 6398c854473SDmitry Monakhov /** 640748de673SAkira Fujita * mext_replace_branches - Replace original extents with new extents 641748de673SAkira Fujita * 642748de673SAkira Fujita * @handle: journal handle 643748de673SAkira Fujita * @orig_inode: original inode 644748de673SAkira Fujita * @donor_inode: donor inode 645748de673SAkira Fujita * @from: block offset of orig_inode 646748de673SAkira Fujita * @count: block count to be replaced 647f868a48dSAkira Fujita * @err: pointer to save return value 648748de673SAkira Fujita * 649748de673SAkira Fujita * Replace original inode extents and donor inode extents page by page. 650748de673SAkira Fujita * We implement this replacement in the following three steps: 651748de673SAkira Fujita * 1. Save the block information of original and donor inodes into 652748de673SAkira Fujita * dummy extents. 653748de673SAkira Fujita * 2. Change the block information of original inode to point at the 654748de673SAkira Fujita * donor inode blocks. 655748de673SAkira Fujita * 3. Change the block information of donor inode to point at the saved 656748de673SAkira Fujita * original inode blocks in the dummy extents. 657748de673SAkira Fujita * 658f868a48dSAkira Fujita * Return replaced block count. 659748de673SAkira Fujita */ 660748de673SAkira Fujita static int 661748de673SAkira Fujita mext_replace_branches(handle_t *handle, struct inode *orig_inode, 662748de673SAkira Fujita struct inode *donor_inode, ext4_lblk_t from, 663f868a48dSAkira Fujita ext4_lblk_t count, int *err) 664748de673SAkira Fujita { 665748de673SAkira Fujita struct ext4_ext_path *orig_path = NULL; 666748de673SAkira Fujita struct ext4_ext_path *donor_path = NULL; 667748de673SAkira Fujita struct ext4_extent *oext, *dext; 668748de673SAkira Fujita struct ext4_extent tmp_dext, tmp_oext; 669748de673SAkira Fujita ext4_lblk_t orig_off = from, donor_off = from; 670748de673SAkira Fujita int depth; 671748de673SAkira Fujita int replaced_count = 0; 672748de673SAkira Fujita int dext_alen; 673748de673SAkira Fujita 6746ca470d7SDmitry Monakhov *err = ext4_es_remove_extent(orig_inode, from, count); 6756ca470d7SDmitry Monakhov if (*err) 6766ca470d7SDmitry Monakhov goto out; 6776ca470d7SDmitry Monakhov 6786ca470d7SDmitry Monakhov *err = ext4_es_remove_extent(donor_inode, from, count); 6796ca470d7SDmitry Monakhov if (*err) 6806ca470d7SDmitry Monakhov goto out; 6816ca470d7SDmitry Monakhov 682748de673SAkira Fujita /* Get the original extent for the block "orig_off" */ 683f868a48dSAkira Fujita *err = get_ext_path(orig_inode, orig_off, &orig_path); 684f868a48dSAkira Fujita if (*err) 685748de673SAkira Fujita goto out; 686748de673SAkira Fujita 687748de673SAkira Fujita /* Get the donor extent for the head */ 688f868a48dSAkira Fujita *err = get_ext_path(donor_inode, donor_off, &donor_path); 689f868a48dSAkira Fujita if (*err) 690748de673SAkira Fujita goto out; 691748de673SAkira Fujita depth = ext_depth(orig_inode); 692748de673SAkira Fujita oext = orig_path[depth].p_ext; 693748de673SAkira Fujita tmp_oext = *oext; 694748de673SAkira Fujita 695748de673SAkira Fujita depth = ext_depth(donor_inode); 696748de673SAkira Fujita dext = donor_path[depth].p_ext; 69787e69873SAkria Fujita if (unlikely(!dext)) 69887e69873SAkria Fujita goto missing_donor_extent; 699748de673SAkira Fujita tmp_dext = *dext; 700748de673SAkira Fujita 701f868a48dSAkira Fujita *err = mext_calc_swap_extents(&tmp_dext, &tmp_oext, orig_off, 702748de673SAkira Fujita donor_off, count); 703f868a48dSAkira Fujita if (*err) 704c40ce3c9SAkira Fujita goto out; 705748de673SAkira Fujita 706748de673SAkira Fujita /* Loop for the donor extents */ 707748de673SAkira Fujita while (1) { 708748de673SAkira Fujita /* The extent for donor must be found. */ 70987e69873SAkria Fujita if (unlikely(!dext)) { 71087e69873SAkria Fujita missing_donor_extent: 71124676da4STheodore Ts'o EXT4_ERROR_INODE(donor_inode, 7122147b1a6SAkira Fujita "The extent for donor must be found"); 713f868a48dSAkira Fujita *err = -EIO; 7142147b1a6SAkira Fujita goto out; 7152147b1a6SAkira Fujita } else if (donor_off != le32_to_cpu(tmp_dext.ee_block)) { 71624676da4STheodore Ts'o EXT4_ERROR_INODE(donor_inode, 7172147b1a6SAkira Fujita "Donor offset(%u) and the first block of donor " 7182147b1a6SAkira Fujita "extent(%u) should be equal", 7192147b1a6SAkira Fujita donor_off, 7202147b1a6SAkira Fujita le32_to_cpu(tmp_dext.ee_block)); 721f868a48dSAkira Fujita *err = -EIO; 7222147b1a6SAkira Fujita goto out; 7232147b1a6SAkira Fujita } 724748de673SAkira Fujita 725748de673SAkira Fujita /* Set donor extent to orig extent */ 726f868a48dSAkira Fujita *err = mext_leaf_block(handle, orig_inode, 727748de673SAkira Fujita orig_path, &tmp_dext, &orig_off); 728f868a48dSAkira Fujita if (*err) 729748de673SAkira Fujita goto out; 730748de673SAkira Fujita 731748de673SAkira Fujita /* Set orig extent to donor extent */ 732f868a48dSAkira Fujita *err = mext_leaf_block(handle, donor_inode, 733748de673SAkira Fujita donor_path, &tmp_oext, &donor_off); 734f868a48dSAkira Fujita if (*err) 735748de673SAkira Fujita goto out; 736748de673SAkira Fujita 737748de673SAkira Fujita dext_alen = ext4_ext_get_actual_len(&tmp_dext); 738748de673SAkira Fujita replaced_count += dext_alen; 739748de673SAkira Fujita donor_off += dext_alen; 740748de673SAkira Fujita orig_off += dext_alen; 741748de673SAkira Fujita 742748de673SAkira Fujita /* Already moved the expected blocks */ 743748de673SAkira Fujita if (replaced_count >= count) 744748de673SAkira Fujita break; 745748de673SAkira Fujita 746748de673SAkira Fujita if (orig_path) 747748de673SAkira Fujita ext4_ext_drop_refs(orig_path); 748f868a48dSAkira Fujita *err = get_ext_path(orig_inode, orig_off, &orig_path); 749f868a48dSAkira Fujita if (*err) 750748de673SAkira Fujita goto out; 751748de673SAkira Fujita depth = ext_depth(orig_inode); 752748de673SAkira Fujita oext = orig_path[depth].p_ext; 753748de673SAkira Fujita tmp_oext = *oext; 754748de673SAkira Fujita 755748de673SAkira Fujita if (donor_path) 756748de673SAkira Fujita ext4_ext_drop_refs(donor_path); 757f868a48dSAkira Fujita *err = get_ext_path(donor_inode, donor_off, &donor_path); 758f868a48dSAkira Fujita if (*err) 759748de673SAkira Fujita goto out; 760748de673SAkira Fujita depth = ext_depth(donor_inode); 761748de673SAkira Fujita dext = donor_path[depth].p_ext; 762748de673SAkira Fujita tmp_dext = *dext; 763748de673SAkira Fujita 764f868a48dSAkira Fujita *err = mext_calc_swap_extents(&tmp_dext, &tmp_oext, orig_off, 765c40ce3c9SAkira Fujita donor_off, count - replaced_count); 766f868a48dSAkira Fujita if (*err) 767c40ce3c9SAkira Fujita goto out; 768748de673SAkira Fujita } 769748de673SAkira Fujita 770748de673SAkira Fujita out: 771748de673SAkira Fujita if (orig_path) { 772748de673SAkira Fujita ext4_ext_drop_refs(orig_path); 773748de673SAkira Fujita kfree(orig_path); 774748de673SAkira Fujita } 775748de673SAkira Fujita if (donor_path) { 776748de673SAkira Fujita ext4_ext_drop_refs(donor_path); 777748de673SAkira Fujita kfree(donor_path); 778748de673SAkira Fujita } 779748de673SAkira Fujita 780f868a48dSAkira Fujita return replaced_count; 781748de673SAkira Fujita } 782748de673SAkira Fujita 783748de673SAkira Fujita /** 784bb557488SDmitry Monakhov * mext_page_double_lock - Grab and lock pages on both @inode1 and @inode2 785bb557488SDmitry Monakhov * 786bb557488SDmitry Monakhov * @inode1: the inode structure 787bb557488SDmitry Monakhov * @inode2: the inode structure 788bb557488SDmitry Monakhov * @index: page index 789bb557488SDmitry Monakhov * @page: result page vector 790bb557488SDmitry Monakhov * 791bb557488SDmitry Monakhov * Grab two locked pages for inode's by inode order 792bb557488SDmitry Monakhov */ 793bb557488SDmitry Monakhov static int 794bb557488SDmitry Monakhov mext_page_double_lock(struct inode *inode1, struct inode *inode2, 795bb557488SDmitry Monakhov pgoff_t index, struct page *page[2]) 796bb557488SDmitry Monakhov { 797bb557488SDmitry Monakhov struct address_space *mapping[2]; 798bb557488SDmitry Monakhov unsigned fl = AOP_FLAG_NOFS; 799bb557488SDmitry Monakhov 800bb557488SDmitry Monakhov BUG_ON(!inode1 || !inode2); 801bb557488SDmitry Monakhov if (inode1 < inode2) { 802bb557488SDmitry Monakhov mapping[0] = inode1->i_mapping; 803bb557488SDmitry Monakhov mapping[1] = inode2->i_mapping; 804bb557488SDmitry Monakhov } else { 805bb557488SDmitry Monakhov mapping[0] = inode2->i_mapping; 806bb557488SDmitry Monakhov mapping[1] = inode1->i_mapping; 807bb557488SDmitry Monakhov } 808bb557488SDmitry Monakhov 809bb557488SDmitry Monakhov page[0] = grab_cache_page_write_begin(mapping[0], index, fl); 810bb557488SDmitry Monakhov if (!page[0]) 811bb557488SDmitry Monakhov return -ENOMEM; 812bb557488SDmitry Monakhov 813bb557488SDmitry Monakhov page[1] = grab_cache_page_write_begin(mapping[1], index, fl); 814bb557488SDmitry Monakhov if (!page[1]) { 815bb557488SDmitry Monakhov unlock_page(page[0]); 816bb557488SDmitry Monakhov page_cache_release(page[0]); 817bb557488SDmitry Monakhov return -ENOMEM; 818bb557488SDmitry Monakhov } 819bb557488SDmitry Monakhov 820bb557488SDmitry Monakhov if (inode1 > inode2) { 821bb557488SDmitry Monakhov struct page *tmp; 822bb557488SDmitry Monakhov tmp = page[0]; 823bb557488SDmitry Monakhov page[0] = page[1]; 824bb557488SDmitry Monakhov page[1] = tmp; 825bb557488SDmitry Monakhov } 826bb557488SDmitry Monakhov return 0; 827bb557488SDmitry Monakhov } 828bb557488SDmitry Monakhov 829bb557488SDmitry Monakhov /* Force page buffers uptodate w/o dropping page's lock */ 830bb557488SDmitry Monakhov static int 831bb557488SDmitry Monakhov mext_page_mkuptodate(struct page *page, unsigned from, unsigned to) 832bb557488SDmitry Monakhov { 833bb557488SDmitry Monakhov struct inode *inode = page->mapping->host; 834bb557488SDmitry Monakhov sector_t block; 835bb557488SDmitry Monakhov struct buffer_head *bh, *head, *arr[MAX_BUF_PER_PAGE]; 836bb557488SDmitry Monakhov unsigned int blocksize, block_start, block_end; 837bb557488SDmitry Monakhov int i, err, nr = 0, partial = 0; 838bb557488SDmitry Monakhov BUG_ON(!PageLocked(page)); 839bb557488SDmitry Monakhov BUG_ON(PageWriteback(page)); 840bb557488SDmitry Monakhov 841bb557488SDmitry Monakhov if (PageUptodate(page)) 842bb557488SDmitry Monakhov return 0; 843bb557488SDmitry Monakhov 844bb557488SDmitry Monakhov blocksize = 1 << inode->i_blkbits; 845bb557488SDmitry Monakhov if (!page_has_buffers(page)) 846bb557488SDmitry Monakhov create_empty_buffers(page, blocksize, 0); 847bb557488SDmitry Monakhov 848bb557488SDmitry Monakhov head = page_buffers(page); 849bb557488SDmitry Monakhov block = (sector_t)page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits); 850bb557488SDmitry Monakhov for (bh = head, block_start = 0; bh != head || !block_start; 851bb557488SDmitry Monakhov block++, block_start = block_end, bh = bh->b_this_page) { 852bb557488SDmitry Monakhov block_end = block_start + blocksize; 853bb557488SDmitry Monakhov if (block_end <= from || block_start >= to) { 854bb557488SDmitry Monakhov if (!buffer_uptodate(bh)) 855bb557488SDmitry Monakhov partial = 1; 856bb557488SDmitry Monakhov continue; 857bb557488SDmitry Monakhov } 858bb557488SDmitry Monakhov if (buffer_uptodate(bh)) 859bb557488SDmitry Monakhov continue; 860bb557488SDmitry Monakhov if (!buffer_mapped(bh)) { 861bb557488SDmitry Monakhov int err = 0; 862bb557488SDmitry Monakhov err = ext4_get_block(inode, block, bh, 0); 863bb557488SDmitry Monakhov if (err) { 864bb557488SDmitry Monakhov SetPageError(page); 865bb557488SDmitry Monakhov return err; 866bb557488SDmitry Monakhov } 867bb557488SDmitry Monakhov if (!buffer_mapped(bh)) { 868bb557488SDmitry Monakhov zero_user(page, block_start, blocksize); 869bb557488SDmitry Monakhov if (!err) 870bb557488SDmitry Monakhov set_buffer_uptodate(bh); 871bb557488SDmitry Monakhov continue; 872bb557488SDmitry Monakhov } 873bb557488SDmitry Monakhov } 874bb557488SDmitry Monakhov BUG_ON(nr >= MAX_BUF_PER_PAGE); 875bb557488SDmitry Monakhov arr[nr++] = bh; 876bb557488SDmitry Monakhov } 877bb557488SDmitry Monakhov /* No io required */ 878bb557488SDmitry Monakhov if (!nr) 879bb557488SDmitry Monakhov goto out; 880bb557488SDmitry Monakhov 881bb557488SDmitry Monakhov for (i = 0; i < nr; i++) { 882bb557488SDmitry Monakhov bh = arr[i]; 883bb557488SDmitry Monakhov if (!bh_uptodate_or_lock(bh)) { 884bb557488SDmitry Monakhov err = bh_submit_read(bh); 885bb557488SDmitry Monakhov if (err) 886bb557488SDmitry Monakhov return err; 887bb557488SDmitry Monakhov } 888bb557488SDmitry Monakhov } 889bb557488SDmitry Monakhov out: 890bb557488SDmitry Monakhov if (!partial) 891bb557488SDmitry Monakhov SetPageUptodate(page); 892bb557488SDmitry Monakhov return 0; 893bb557488SDmitry Monakhov } 894bb557488SDmitry Monakhov 895bb557488SDmitry Monakhov /** 896748de673SAkira Fujita * move_extent_per_page - Move extent data per page 897748de673SAkira Fujita * 898748de673SAkira Fujita * @o_filp: file structure of original file 899748de673SAkira Fujita * @donor_inode: donor inode 900748de673SAkira Fujita * @orig_page_offset: page index on original file 901748de673SAkira Fujita * @data_offset_in_page: block index where data swapping starts 902748de673SAkira Fujita * @block_len_in_page: the number of blocks to be swapped 903748de673SAkira Fujita * @uninit: orig extent is uninitialized or not 904f868a48dSAkira Fujita * @err: pointer to save return value 905748de673SAkira Fujita * 906748de673SAkira Fujita * Save the data in original inode blocks and replace original inode extents 907748de673SAkira Fujita * with donor inode extents by calling mext_replace_branches(). 908f868a48dSAkira Fujita * Finally, write out the saved data in new original inode blocks. Return 909f868a48dSAkira Fujita * replaced block count. 910748de673SAkira Fujita */ 911748de673SAkira Fujita static int 91244fc48f7SAkira Fujita move_extent_per_page(struct file *o_filp, struct inode *donor_inode, 913748de673SAkira Fujita pgoff_t orig_page_offset, int data_offset_in_page, 914f868a48dSAkira Fujita int block_len_in_page, int uninit, int *err) 915748de673SAkira Fujita { 916496ad9aaSAl Viro struct inode *orig_inode = file_inode(o_filp); 917bb557488SDmitry Monakhov struct page *pagep[2] = {NULL, NULL}; 918748de673SAkira Fujita handle_t *handle; 919748de673SAkira Fujita ext4_lblk_t orig_blk_offset; 920748de673SAkira Fujita long long offs = orig_page_offset << PAGE_CACHE_SHIFT; 921748de673SAkira Fujita unsigned long blocksize = orig_inode->i_sb->s_blocksize; 922748de673SAkira Fujita unsigned int w_flags = 0; 923f868a48dSAkira Fujita unsigned int tmp_data_size, data_size, replaced_size; 924bb557488SDmitry Monakhov int err2, jblocks, retries = 0; 925f868a48dSAkira Fujita int replaced_count = 0; 926bb557488SDmitry Monakhov int from = data_offset_in_page << orig_inode->i_blkbits; 927748de673SAkira Fujita int blocks_per_page = PAGE_CACHE_SIZE >> orig_inode->i_blkbits; 928748de673SAkira Fujita 929748de673SAkira Fujita /* 930748de673SAkira Fujita * It needs twice the amount of ordinary journal buffers because 931748de673SAkira Fujita * inode and donor_inode may change each different metadata blocks. 932748de673SAkira Fujita */ 933bb557488SDmitry Monakhov again: 934bb557488SDmitry Monakhov *err = 0; 935748de673SAkira Fujita jblocks = ext4_writepage_trans_blocks(orig_inode) * 2; 9369924a92aSTheodore Ts'o handle = ext4_journal_start(orig_inode, EXT4_HT_MOVE_EXTENTS, jblocks); 937748de673SAkira Fujita if (IS_ERR(handle)) { 938f868a48dSAkira Fujita *err = PTR_ERR(handle); 939f868a48dSAkira Fujita return 0; 940748de673SAkira Fujita } 941748de673SAkira Fujita 942748de673SAkira Fujita if (segment_eq(get_fs(), KERNEL_DS)) 943748de673SAkira Fujita w_flags |= AOP_FLAG_UNINTERRUPTIBLE; 944748de673SAkira Fujita 945748de673SAkira Fujita orig_blk_offset = orig_page_offset * blocks_per_page + 946748de673SAkira Fujita data_offset_in_page; 947748de673SAkira Fujita 948748de673SAkira Fujita offs = (long long)orig_blk_offset << orig_inode->i_blkbits; 949748de673SAkira Fujita 950f868a48dSAkira Fujita /* Calculate data_size */ 951748de673SAkira Fujita if ((orig_blk_offset + block_len_in_page - 1) == 952748de673SAkira Fujita ((orig_inode->i_size - 1) >> orig_inode->i_blkbits)) { 953748de673SAkira Fujita /* Replace the last block */ 954f868a48dSAkira Fujita tmp_data_size = orig_inode->i_size & (blocksize - 1); 955748de673SAkira Fujita /* 956f868a48dSAkira Fujita * If data_size equal zero, it shows data_size is multiples of 957748de673SAkira Fujita * blocksize. So we set appropriate value. 958748de673SAkira Fujita */ 959f868a48dSAkira Fujita if (tmp_data_size == 0) 960f868a48dSAkira Fujita tmp_data_size = blocksize; 961748de673SAkira Fujita 962f868a48dSAkira Fujita data_size = tmp_data_size + 963748de673SAkira Fujita ((block_len_in_page - 1) << orig_inode->i_blkbits); 964f868a48dSAkira Fujita } else 965f868a48dSAkira Fujita data_size = block_len_in_page << orig_inode->i_blkbits; 966748de673SAkira Fujita 967f868a48dSAkira Fujita replaced_size = data_size; 968f868a48dSAkira Fujita 969bb557488SDmitry Monakhov *err = mext_page_double_lock(orig_inode, donor_inode, orig_page_offset, 970bb557488SDmitry Monakhov pagep); 971f868a48dSAkira Fujita if (unlikely(*err < 0)) 972bb557488SDmitry Monakhov goto stop_journal; 9738c854473SDmitry Monakhov /* 9748c854473SDmitry Monakhov * If orig extent was uninitialized it can become initialized 9758c854473SDmitry Monakhov * at any time after i_data_sem was dropped, in order to 9768c854473SDmitry Monakhov * serialize with delalloc we have recheck extent while we 9778c854473SDmitry Monakhov * hold page's lock, if it is still the case data copy is not 9788c854473SDmitry Monakhov * necessary, just swap data blocks between orig and donor. 9798c854473SDmitry Monakhov */ 9808c854473SDmitry Monakhov if (uninit) { 981393d1d1dSDr. Tilmann Bubeck ext4_double_down_write_data_sem(orig_inode, donor_inode); 9828c854473SDmitry Monakhov /* If any of extents in range became initialized we have to 9838c854473SDmitry Monakhov * fallback to data copying */ 9848c854473SDmitry Monakhov uninit = mext_check_coverage(orig_inode, orig_blk_offset, 9858c854473SDmitry Monakhov block_len_in_page, 1, err); 9868c854473SDmitry Monakhov if (*err) 9878c854473SDmitry Monakhov goto drop_data_sem; 988748de673SAkira Fujita 9898c854473SDmitry Monakhov uninit &= mext_check_coverage(donor_inode, orig_blk_offset, 9908c854473SDmitry Monakhov block_len_in_page, 1, err); 9918c854473SDmitry Monakhov if (*err) 9928c854473SDmitry Monakhov goto drop_data_sem; 9938c854473SDmitry Monakhov 9948c854473SDmitry Monakhov if (!uninit) { 995393d1d1dSDr. Tilmann Bubeck ext4_double_up_write_data_sem(orig_inode, donor_inode); 9968c854473SDmitry Monakhov goto data_copy; 9978c854473SDmitry Monakhov } 9988c854473SDmitry Monakhov if ((page_has_private(pagep[0]) && 9998c854473SDmitry Monakhov !try_to_release_page(pagep[0], 0)) || 10008c854473SDmitry Monakhov (page_has_private(pagep[1]) && 10018c854473SDmitry Monakhov !try_to_release_page(pagep[1], 0))) { 10028c854473SDmitry Monakhov *err = -EBUSY; 10038c854473SDmitry Monakhov goto drop_data_sem; 10048c854473SDmitry Monakhov } 10058c854473SDmitry Monakhov replaced_count = mext_replace_branches(handle, orig_inode, 10068c854473SDmitry Monakhov donor_inode, orig_blk_offset, 10078c854473SDmitry Monakhov block_len_in_page, err); 10088c854473SDmitry Monakhov drop_data_sem: 1009393d1d1dSDr. Tilmann Bubeck ext4_double_up_write_data_sem(orig_inode, donor_inode); 10108c854473SDmitry Monakhov goto unlock_pages; 10118c854473SDmitry Monakhov } 10128c854473SDmitry Monakhov data_copy: 1013bb557488SDmitry Monakhov *err = mext_page_mkuptodate(pagep[0], from, from + replaced_size); 1014bb557488SDmitry Monakhov if (*err) 1015bb557488SDmitry Monakhov goto unlock_pages; 1016bb557488SDmitry Monakhov 1017bb557488SDmitry Monakhov /* At this point all buffers in range are uptodate, old mapping layout 1018bb557488SDmitry Monakhov * is no longer required, try to drop it now. */ 1019bb557488SDmitry Monakhov if ((page_has_private(pagep[0]) && !try_to_release_page(pagep[0], 0)) || 1020bb557488SDmitry Monakhov (page_has_private(pagep[1]) && !try_to_release_page(pagep[1], 0))) { 1021bb557488SDmitry Monakhov *err = -EBUSY; 1022bb557488SDmitry Monakhov goto unlock_pages; 1023748de673SAkira Fujita } 1024748de673SAkira Fujita 1025f868a48dSAkira Fujita replaced_count = mext_replace_branches(handle, orig_inode, donor_inode, 1026bb557488SDmitry Monakhov orig_blk_offset, 1027bb557488SDmitry Monakhov block_len_in_page, err); 1028bb557488SDmitry Monakhov if (*err) { 1029f868a48dSAkira Fujita if (replaced_count) { 1030f868a48dSAkira Fujita block_len_in_page = replaced_count; 1031f868a48dSAkira Fujita replaced_size = 1032f868a48dSAkira Fujita block_len_in_page << orig_inode->i_blkbits; 1033ac48b0a1SAkira Fujita } else 1034bb557488SDmitry Monakhov goto unlock_pages; 1035f868a48dSAkira Fujita } 1036bb557488SDmitry Monakhov /* Perform all necessary steps similar write_begin()/write_end() 1037bb557488SDmitry Monakhov * but keeping in mind that i_size will not change */ 1038bb557488SDmitry Monakhov *err = __block_write_begin(pagep[0], from, from + replaced_size, 1039bb557488SDmitry Monakhov ext4_get_block); 1040bb557488SDmitry Monakhov if (!*err) 1041bb557488SDmitry Monakhov *err = block_commit_write(pagep[0], from, from + replaced_size); 1042fc04cb49SAkira Fujita 1043bb557488SDmitry Monakhov if (unlikely(*err < 0)) 1044bb557488SDmitry Monakhov goto repair_branches; 1045748de673SAkira Fujita 1046bb557488SDmitry Monakhov /* Even in case of data=writeback it is reasonable to pin 1047bb557488SDmitry Monakhov * inode to transaction, to prevent unexpected data loss */ 1048bb557488SDmitry Monakhov *err = ext4_jbd2_file_inode(handle, orig_inode); 1049748de673SAkira Fujita 1050bb557488SDmitry Monakhov unlock_pages: 1051bb557488SDmitry Monakhov unlock_page(pagep[0]); 1052bb557488SDmitry Monakhov page_cache_release(pagep[0]); 1053bb557488SDmitry Monakhov unlock_page(pagep[1]); 1054bb557488SDmitry Monakhov page_cache_release(pagep[1]); 1055bb557488SDmitry Monakhov stop_journal: 105691cc219aSPeng Tao ext4_journal_stop(handle); 1057bb557488SDmitry Monakhov /* Buffer was busy because probably is pinned to journal transaction, 1058bb557488SDmitry Monakhov * force transaction commit may help to free it. */ 1059bb557488SDmitry Monakhov if (*err == -EBUSY && ext4_should_retry_alloc(orig_inode->i_sb, 1060bb557488SDmitry Monakhov &retries)) 1061bb557488SDmitry Monakhov goto again; 1062f868a48dSAkira Fujita return replaced_count; 1063bb557488SDmitry Monakhov 1064bb557488SDmitry Monakhov repair_branches: 1065bb557488SDmitry Monakhov /* 1066bb557488SDmitry Monakhov * This should never ever happen! 1067bb557488SDmitry Monakhov * Extents are swapped already, but we are not able to copy data. 1068bb557488SDmitry Monakhov * Try to swap extents to it's original places 1069bb557488SDmitry Monakhov */ 1070393d1d1dSDr. Tilmann Bubeck ext4_double_down_write_data_sem(orig_inode, donor_inode); 1071bb557488SDmitry Monakhov replaced_count = mext_replace_branches(handle, donor_inode, orig_inode, 1072bb557488SDmitry Monakhov orig_blk_offset, 1073bb557488SDmitry Monakhov block_len_in_page, &err2); 1074393d1d1dSDr. Tilmann Bubeck ext4_double_up_write_data_sem(orig_inode, donor_inode); 1075bb557488SDmitry Monakhov if (replaced_count != block_len_in_page) { 1076bb557488SDmitry Monakhov EXT4_ERROR_INODE_BLOCK(orig_inode, (sector_t)(orig_blk_offset), 1077bb557488SDmitry Monakhov "Unable to copy data block," 1078bb557488SDmitry Monakhov " data will be lost."); 1079bb557488SDmitry Monakhov *err = -EIO; 1080bb557488SDmitry Monakhov } 1081bb557488SDmitry Monakhov replaced_count = 0; 1082bb557488SDmitry Monakhov goto unlock_pages; 1083748de673SAkira Fujita } 1084748de673SAkira Fujita 1085748de673SAkira Fujita /** 1086c437b273SAkira Fujita * mext_check_arguments - Check whether move extent can be done 1087748de673SAkira Fujita * 1088748de673SAkira Fujita * @orig_inode: original inode 1089748de673SAkira Fujita * @donor_inode: donor inode 1090748de673SAkira Fujita * @orig_start: logical start offset in block for orig 1091748de673SAkira Fujita * @donor_start: logical start offset in block for donor 1092748de673SAkira Fujita * @len: the number of blocks to be moved 1093748de673SAkira Fujita * 1094748de673SAkira Fujita * Check the arguments of ext4_move_extents() whether the files can be 1095748de673SAkira Fujita * exchanged with each other. 1096748de673SAkira Fujita * Return 0 on success, or a negative error value on failure. 1097748de673SAkira Fujita */ 1098748de673SAkira Fujita static int 1099748de673SAkira Fujita mext_check_arguments(struct inode *orig_inode, 1100748de673SAkira Fujita struct inode *donor_inode, __u64 orig_start, 1101446aaa6eSKazuya Mio __u64 donor_start, __u64 *len) 1102748de673SAkira Fujita { 110370d5d3dcSAkira Fujita ext4_lblk_t orig_blocks, donor_blocks; 110470d5d3dcSAkira Fujita unsigned int blkbits = orig_inode->i_blkbits; 110570d5d3dcSAkira Fujita unsigned int blocksize = 1 << blkbits; 110670d5d3dcSAkira Fujita 11074a58579bSAkira Fujita if (donor_inode->i_mode & (S_ISUID|S_ISGID)) { 11084a58579bSAkira Fujita ext4_debug("ext4 move extent: suid or sgid is set" 11094a58579bSAkira Fujita " to donor file [ino:orig %lu, donor %lu]\n", 11104a58579bSAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 11114a58579bSAkira Fujita return -EINVAL; 11124a58579bSAkira Fujita } 11134a58579bSAkira Fujita 11141f5a81e4STheodore Ts'o if (IS_IMMUTABLE(donor_inode) || IS_APPEND(donor_inode)) 11151f5a81e4STheodore Ts'o return -EPERM; 11161f5a81e4STheodore Ts'o 1117748de673SAkira Fujita /* Ext4 move extent does not support swapfile */ 1118748de673SAkira Fujita if (IS_SWAPFILE(orig_inode) || IS_SWAPFILE(donor_inode)) { 1119748de673SAkira Fujita ext4_debug("ext4 move extent: The argument files should " 1120748de673SAkira Fujita "not be swapfile [ino:orig %lu, donor %lu]\n", 1121748de673SAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 1122748de673SAkira Fujita return -EINVAL; 1123748de673SAkira Fujita } 1124748de673SAkira Fujita 1125748de673SAkira Fujita /* Ext4 move extent supports only extent based file */ 112612e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(orig_inode, EXT4_INODE_EXTENTS))) { 1127748de673SAkira Fujita ext4_debug("ext4 move extent: orig file is not extents " 1128748de673SAkira Fujita "based file [ino:orig %lu]\n", orig_inode->i_ino); 1129748de673SAkira Fujita return -EOPNOTSUPP; 113012e9b892SDmitry Monakhov } else if (!(ext4_test_inode_flag(donor_inode, EXT4_INODE_EXTENTS))) { 1131748de673SAkira Fujita ext4_debug("ext4 move extent: donor file is not extents " 1132748de673SAkira Fujita "based file [ino:donor %lu]\n", donor_inode->i_ino); 1133748de673SAkira Fujita return -EOPNOTSUPP; 1134748de673SAkira Fujita } 1135748de673SAkira Fujita 1136748de673SAkira Fujita if ((!orig_inode->i_size) || (!donor_inode->i_size)) { 1137748de673SAkira Fujita ext4_debug("ext4 move extent: File size is 0 byte\n"); 1138748de673SAkira Fujita return -EINVAL; 1139748de673SAkira Fujita } 1140748de673SAkira Fujita 1141748de673SAkira Fujita /* Start offset should be same */ 1142748de673SAkira Fujita if (orig_start != donor_start) { 1143748de673SAkira Fujita ext4_debug("ext4 move extent: orig and donor's start " 1144748de673SAkira Fujita "offset are not same [ino:orig %lu, donor %lu]\n", 1145748de673SAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 1146748de673SAkira Fujita return -EINVAL; 1147748de673SAkira Fujita } 1148748de673SAkira Fujita 1149f17722f9SLukas Czerner if ((orig_start >= EXT_MAX_BLOCKS) || 1150f17722f9SLukas Czerner (*len > EXT_MAX_BLOCKS) || 1151f17722f9SLukas Czerner (orig_start + *len >= EXT_MAX_BLOCKS)) { 11520a80e986SEric Sandeen ext4_debug("ext4 move extent: Can't handle over [%u] blocks " 1153f17722f9SLukas Czerner "[ino:orig %lu, donor %lu]\n", EXT_MAX_BLOCKS, 1154748de673SAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 1155748de673SAkira Fujita return -EINVAL; 1156748de673SAkira Fujita } 1157748de673SAkira Fujita 1158748de673SAkira Fujita if (orig_inode->i_size > donor_inode->i_size) { 115970d5d3dcSAkira Fujita donor_blocks = (donor_inode->i_size + blocksize - 1) >> blkbits; 116070d5d3dcSAkira Fujita /* TODO: eliminate this artificial restriction */ 116170d5d3dcSAkira Fujita if (orig_start >= donor_blocks) { 1162748de673SAkira Fujita ext4_debug("ext4 move extent: orig start offset " 116370d5d3dcSAkira Fujita "[%llu] should be less than donor file blocks " 116470d5d3dcSAkira Fujita "[%u] [ino:orig %lu, donor %lu]\n", 116570d5d3dcSAkira Fujita orig_start, donor_blocks, 1166748de673SAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 1167748de673SAkira Fujita return -EINVAL; 1168748de673SAkira Fujita } 1169748de673SAkira Fujita 117070d5d3dcSAkira Fujita /* TODO: eliminate this artificial restriction */ 117170d5d3dcSAkira Fujita if (orig_start + *len > donor_blocks) { 1172748de673SAkira Fujita ext4_debug("ext4 move extent: End offset [%llu] should " 117370d5d3dcSAkira Fujita "be less than donor file blocks [%u]." 117470d5d3dcSAkira Fujita "So adjust length from %llu to %llu " 1175748de673SAkira Fujita "[ino:orig %lu, donor %lu]\n", 117670d5d3dcSAkira Fujita orig_start + *len, donor_blocks, 117770d5d3dcSAkira Fujita *len, donor_blocks - orig_start, 1178748de673SAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 117970d5d3dcSAkira Fujita *len = donor_blocks - orig_start; 1180748de673SAkira Fujita } 1181748de673SAkira Fujita } else { 118270d5d3dcSAkira Fujita orig_blocks = (orig_inode->i_size + blocksize - 1) >> blkbits; 118370d5d3dcSAkira Fujita if (orig_start >= orig_blocks) { 1184748de673SAkira Fujita ext4_debug("ext4 move extent: start offset [%llu] " 118570d5d3dcSAkira Fujita "should be less than original file blocks " 118670d5d3dcSAkira Fujita "[%u] [ino:orig %lu, donor %lu]\n", 118770d5d3dcSAkira Fujita orig_start, orig_blocks, 1188748de673SAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 1189748de673SAkira Fujita return -EINVAL; 1190748de673SAkira Fujita } 1191748de673SAkira Fujita 119270d5d3dcSAkira Fujita if (orig_start + *len > orig_blocks) { 1193748de673SAkira Fujita ext4_debug("ext4 move extent: Adjust length " 119470d5d3dcSAkira Fujita "from %llu to %llu. Because it should be " 119570d5d3dcSAkira Fujita "less than original file blocks " 1196748de673SAkira Fujita "[ino:orig %lu, donor %lu]\n", 119770d5d3dcSAkira Fujita *len, orig_blocks - orig_start, 1198748de673SAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 119970d5d3dcSAkira Fujita *len = orig_blocks - orig_start; 1200748de673SAkira Fujita } 1201748de673SAkira Fujita } 1202748de673SAkira Fujita 1203748de673SAkira Fujita if (!*len) { 120492c28159SAkira Fujita ext4_debug("ext4 move extent: len should not be 0 " 1205748de673SAkira Fujita "[ino:orig %lu, donor %lu]\n", orig_inode->i_ino, 1206748de673SAkira Fujita donor_inode->i_ino); 1207748de673SAkira Fujita return -EINVAL; 1208748de673SAkira Fujita } 1209748de673SAkira Fujita 1210748de673SAkira Fujita return 0; 1211748de673SAkira Fujita } 1212748de673SAkira Fujita 1213748de673SAkira Fujita /** 1214393d1d1dSDr. Tilmann Bubeck * ext4_inode_double_lock - Lock i_mutex on both @inode1 and @inode2 1215748de673SAkira Fujita * 1216748de673SAkira Fujita * @inode1: the inode structure 1217748de673SAkira Fujita * @inode2: the inode structure 1218748de673SAkira Fujita * 121903bd8b9bSDmitry Monakhov * Lock two inodes' i_mutex 1220748de673SAkira Fujita */ 1221393d1d1dSDr. Tilmann Bubeck void 1222393d1d1dSDr. Tilmann Bubeck ext4_inode_double_lock(struct inode *inode1, struct inode *inode2) 1223748de673SAkira Fujita { 122403bd8b9bSDmitry Monakhov BUG_ON(inode1 == inode2); 122503bd8b9bSDmitry Monakhov if (inode1 < inode2) { 1226748de673SAkira Fujita mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT); 1227748de673SAkira Fujita mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD); 1228748de673SAkira Fujita } else { 1229748de673SAkira Fujita mutex_lock_nested(&inode2->i_mutex, I_MUTEX_PARENT); 1230748de673SAkira Fujita mutex_lock_nested(&inode1->i_mutex, I_MUTEX_CHILD); 1231748de673SAkira Fujita } 1232748de673SAkira Fujita } 1233748de673SAkira Fujita 1234748de673SAkira Fujita /** 1235393d1d1dSDr. Tilmann Bubeck * ext4_inode_double_unlock - Release i_mutex on both @inode1 and @inode2 1236748de673SAkira Fujita * 1237748de673SAkira Fujita * @inode1: the inode that is released first 1238748de673SAkira Fujita * @inode2: the inode that is released second 1239748de673SAkira Fujita * 1240748de673SAkira Fujita */ 1241748de673SAkira Fujita 1242393d1d1dSDr. Tilmann Bubeck void 1243393d1d1dSDr. Tilmann Bubeck ext4_inode_double_unlock(struct inode *inode1, struct inode *inode2) 1244748de673SAkira Fujita { 1245748de673SAkira Fujita mutex_unlock(&inode1->i_mutex); 1246748de673SAkira Fujita mutex_unlock(&inode2->i_mutex); 1247748de673SAkira Fujita } 1248748de673SAkira Fujita 1249748de673SAkira Fujita /** 1250748de673SAkira Fujita * ext4_move_extents - Exchange the specified range of a file 1251748de673SAkira Fujita * 1252748de673SAkira Fujita * @o_filp: file structure of the original file 1253748de673SAkira Fujita * @d_filp: file structure of the donor file 1254748de673SAkira Fujita * @orig_start: start offset in block for orig 1255748de673SAkira Fujita * @donor_start: start offset in block for donor 1256748de673SAkira Fujita * @len: the number of blocks to be moved 1257748de673SAkira Fujita * @moved_len: moved block length 1258748de673SAkira Fujita * 1259748de673SAkira Fujita * This function returns 0 and moved block length is set in moved_len 1260748de673SAkira Fujita * if succeed, otherwise returns error value. 1261748de673SAkira Fujita * 1262748de673SAkira Fujita * Note: ext4_move_extents() proceeds the following order. 1263748de673SAkira Fujita * 1:ext4_move_extents() calculates the last block number of moving extent 1264748de673SAkira Fujita * function by the start block number (orig_start) and the number of blocks 1265748de673SAkira Fujita * to be moved (len) specified as arguments. 1266748de673SAkira Fujita * If the {orig, donor}_start points a hole, the extent's start offset 1267748de673SAkira Fujita * pointed by ext_cur (current extent), holecheck_path, orig_path are set 1268748de673SAkira Fujita * after hole behind. 1269748de673SAkira Fujita * 2:Continue step 3 to step 5, until the holecheck_path points to last_extent 1270748de673SAkira Fujita * or the ext_cur exceeds the block_end which is last logical block number. 1271748de673SAkira Fujita * 3:To get the length of continues area, call mext_next_extent() 1272748de673SAkira Fujita * specified with the ext_cur (initial value is holecheck_path) re-cursive, 1273748de673SAkira Fujita * until find un-continuous extent, the start logical block number exceeds 1274748de673SAkira Fujita * the block_end or the extent points to the last extent. 1275748de673SAkira Fujita * 4:Exchange the original inode data with donor inode data 1276748de673SAkira Fujita * from orig_page_offset to seq_end_page. 1277748de673SAkira Fujita * The start indexes of data are specified as arguments. 1278748de673SAkira Fujita * That of the original inode is orig_page_offset, 1279748de673SAkira Fujita * and the donor inode is also orig_page_offset 1280748de673SAkira Fujita * (To easily handle blocksize != pagesize case, the offset for the 1281748de673SAkira Fujita * donor inode is block unit). 1282748de673SAkira Fujita * 5:Update holecheck_path and orig_path to points a next proceeding extent, 1283748de673SAkira Fujita * then returns to step 2. 1284748de673SAkira Fujita * 6:Release holecheck_path, orig_path and set the len to moved_len 1285748de673SAkira Fujita * which shows the number of moved blocks. 1286748de673SAkira Fujita * The moved_len is useful for the command to calculate the file offset 1287748de673SAkira Fujita * for starting next move extent ioctl. 1288748de673SAkira Fujita * 7:Return 0 on success, or a negative error value on failure. 1289748de673SAkira Fujita */ 1290748de673SAkira Fujita int 1291748de673SAkira Fujita ext4_move_extents(struct file *o_filp, struct file *d_filp, 1292748de673SAkira Fujita __u64 orig_start, __u64 donor_start, __u64 len, 1293748de673SAkira Fujita __u64 *moved_len) 1294748de673SAkira Fujita { 1295496ad9aaSAl Viro struct inode *orig_inode = file_inode(o_filp); 1296496ad9aaSAl Viro struct inode *donor_inode = file_inode(d_filp); 1297748de673SAkira Fujita struct ext4_ext_path *orig_path = NULL, *holecheck_path = NULL; 1298748de673SAkira Fujita struct ext4_extent *ext_prev, *ext_cur, *ext_dummy; 1299748de673SAkira Fujita ext4_lblk_t block_start = orig_start; 1300748de673SAkira Fujita ext4_lblk_t block_end, seq_start, add_blocks, file_end, seq_blocks = 0; 1301748de673SAkira Fujita ext4_lblk_t rest_blocks; 1302748de673SAkira Fujita pgoff_t orig_page_offset = 0, seq_end_page; 130303bd8b9bSDmitry Monakhov int ret, depth, last_extent = 0; 1304748de673SAkira Fujita int blocks_per_page = PAGE_CACHE_SIZE >> orig_inode->i_blkbits; 1305748de673SAkira Fujita int data_offset_in_page; 1306748de673SAkira Fujita int block_len_in_page; 1307748de673SAkira Fujita int uninit; 1308748de673SAkira Fujita 130903bd8b9bSDmitry Monakhov if (orig_inode->i_sb != donor_inode->i_sb) { 131003bd8b9bSDmitry Monakhov ext4_debug("ext4 move extent: The argument files " 131103bd8b9bSDmitry Monakhov "should be in same FS [ino:orig %lu, donor %lu]\n", 131203bd8b9bSDmitry Monakhov orig_inode->i_ino, donor_inode->i_ino); 131303bd8b9bSDmitry Monakhov return -EINVAL; 131403bd8b9bSDmitry Monakhov } 131503bd8b9bSDmitry Monakhov 131603bd8b9bSDmitry Monakhov /* orig and donor should be different inodes */ 131703bd8b9bSDmitry Monakhov if (orig_inode == donor_inode) { 1318f3ce8064STheodore Ts'o ext4_debug("ext4 move extent: The argument files should not " 131903bd8b9bSDmitry Monakhov "be same inode [ino:orig %lu, donor %lu]\n", 1320f3ce8064STheodore Ts'o orig_inode->i_ino, donor_inode->i_ino); 1321f3ce8064STheodore Ts'o return -EINVAL; 1322f3ce8064STheodore Ts'o } 1323f3ce8064STheodore Ts'o 13247247c0caSAkira Fujita /* Regular file check */ 13257247c0caSAkira Fujita if (!S_ISREG(orig_inode->i_mode) || !S_ISREG(donor_inode->i_mode)) { 13267247c0caSAkira Fujita ext4_debug("ext4 move extent: The argument files should be " 13277247c0caSAkira Fujita "regular file [ino:orig %lu, donor %lu]\n", 13287247c0caSAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 13297247c0caSAkira Fujita return -EINVAL; 13307247c0caSAkira Fujita } 1331f066055aSDmitry Monakhov /* TODO: This is non obvious task to swap blocks for inodes with full 1332f066055aSDmitry Monakhov jornaling enabled */ 1333f066055aSDmitry Monakhov if (ext4_should_journal_data(orig_inode) || 1334f066055aSDmitry Monakhov ext4_should_journal_data(donor_inode)) { 1335f066055aSDmitry Monakhov return -EINVAL; 1336f066055aSDmitry Monakhov } 1337fc04cb49SAkira Fujita /* Protect orig and donor inodes against a truncate */ 1338393d1d1dSDr. Tilmann Bubeck ext4_inode_double_lock(orig_inode, donor_inode); 1339748de673SAkira Fujita 134017335dccSDmitry Monakhov /* Wait for all existing dio workers */ 134117335dccSDmitry Monakhov ext4_inode_block_unlocked_dio(orig_inode); 134217335dccSDmitry Monakhov ext4_inode_block_unlocked_dio(donor_inode); 134317335dccSDmitry Monakhov inode_dio_wait(orig_inode); 134417335dccSDmitry Monakhov inode_dio_wait(donor_inode); 134517335dccSDmitry Monakhov 1346fc04cb49SAkira Fujita /* Protect extent tree against block allocations via delalloc */ 1347393d1d1dSDr. Tilmann Bubeck ext4_double_down_write_data_sem(orig_inode, donor_inode); 1348748de673SAkira Fujita /* Check the filesystem environment whether move_extent can be done */ 134903bd8b9bSDmitry Monakhov ret = mext_check_arguments(orig_inode, donor_inode, orig_start, 1350446aaa6eSKazuya Mio donor_start, &len); 135103bd8b9bSDmitry Monakhov if (ret) 1352347fa6f1SAkira Fujita goto out; 1353748de673SAkira Fujita 1354748de673SAkira Fujita file_end = (i_size_read(orig_inode) - 1) >> orig_inode->i_blkbits; 1355748de673SAkira Fujita block_end = block_start + len - 1; 1356748de673SAkira Fujita if (file_end < block_end) 1357748de673SAkira Fujita len -= block_end - file_end; 1358748de673SAkira Fujita 135903bd8b9bSDmitry Monakhov ret = get_ext_path(orig_inode, block_start, &orig_path); 136003bd8b9bSDmitry Monakhov if (ret) 1361347fa6f1SAkira Fujita goto out; 1362748de673SAkira Fujita 1363748de673SAkira Fujita /* Get path structure to check the hole */ 136403bd8b9bSDmitry Monakhov ret = get_ext_path(orig_inode, block_start, &holecheck_path); 136503bd8b9bSDmitry Monakhov if (ret) 1366748de673SAkira Fujita goto out; 1367748de673SAkira Fujita 1368748de673SAkira Fujita depth = ext_depth(orig_inode); 1369748de673SAkira Fujita ext_cur = holecheck_path[depth].p_ext; 1370748de673SAkira Fujita 1371748de673SAkira Fujita /* 1372c40ce3c9SAkira Fujita * Get proper starting location of block replacement if block_start was 1373c40ce3c9SAkira Fujita * within the hole. 1374748de673SAkira Fujita */ 1375748de673SAkira Fujita if (le32_to_cpu(ext_cur->ee_block) + 1376748de673SAkira Fujita ext4_ext_get_actual_len(ext_cur) - 1 < block_start) { 1377c40ce3c9SAkira Fujita /* 1378c40ce3c9SAkira Fujita * The hole exists between extents or the tail of 1379c40ce3c9SAkira Fujita * original file. 1380c40ce3c9SAkira Fujita */ 1381748de673SAkira Fujita last_extent = mext_next_extent(orig_inode, 1382748de673SAkira Fujita holecheck_path, &ext_cur); 1383748de673SAkira Fujita if (last_extent < 0) { 138403bd8b9bSDmitry Monakhov ret = last_extent; 1385748de673SAkira Fujita goto out; 1386748de673SAkira Fujita } 1387748de673SAkira Fujita last_extent = mext_next_extent(orig_inode, orig_path, 1388748de673SAkira Fujita &ext_dummy); 1389748de673SAkira Fujita if (last_extent < 0) { 139003bd8b9bSDmitry Monakhov ret = last_extent; 1391748de673SAkira Fujita goto out; 1392748de673SAkira Fujita } 1393c40ce3c9SAkira Fujita seq_start = le32_to_cpu(ext_cur->ee_block); 1394c40ce3c9SAkira Fujita } else if (le32_to_cpu(ext_cur->ee_block) > block_start) 1395c40ce3c9SAkira Fujita /* The hole exists at the beginning of original file. */ 1396c40ce3c9SAkira Fujita seq_start = le32_to_cpu(ext_cur->ee_block); 1397c40ce3c9SAkira Fujita else 1398748de673SAkira Fujita seq_start = block_start; 1399748de673SAkira Fujita 1400748de673SAkira Fujita /* No blocks within the specified range. */ 1401748de673SAkira Fujita if (le32_to_cpu(ext_cur->ee_block) > block_end) { 1402748de673SAkira Fujita ext4_debug("ext4 move extent: The specified range of file " 1403748de673SAkira Fujita "may be the hole\n"); 140403bd8b9bSDmitry Monakhov ret = -EINVAL; 1405748de673SAkira Fujita goto out; 1406748de673SAkira Fujita } 1407748de673SAkira Fujita 1408748de673SAkira Fujita /* Adjust start blocks */ 1409748de673SAkira Fujita add_blocks = min(le32_to_cpu(ext_cur->ee_block) + 1410748de673SAkira Fujita ext4_ext_get_actual_len(ext_cur), block_end + 1) - 1411748de673SAkira Fujita max(le32_to_cpu(ext_cur->ee_block), block_start); 1412748de673SAkira Fujita 1413748de673SAkira Fujita while (!last_extent && le32_to_cpu(ext_cur->ee_block) <= block_end) { 1414748de673SAkira Fujita seq_blocks += add_blocks; 1415748de673SAkira Fujita 1416748de673SAkira Fujita /* Adjust tail blocks */ 1417748de673SAkira Fujita if (seq_start + seq_blocks - 1 > block_end) 1418748de673SAkira Fujita seq_blocks = block_end - seq_start + 1; 1419748de673SAkira Fujita 1420748de673SAkira Fujita ext_prev = ext_cur; 1421748de673SAkira Fujita last_extent = mext_next_extent(orig_inode, holecheck_path, 1422748de673SAkira Fujita &ext_cur); 1423748de673SAkira Fujita if (last_extent < 0) { 142403bd8b9bSDmitry Monakhov ret = last_extent; 1425748de673SAkira Fujita break; 1426748de673SAkira Fujita } 1427748de673SAkira Fujita add_blocks = ext4_ext_get_actual_len(ext_cur); 1428748de673SAkira Fujita 1429748de673SAkira Fujita /* 1430748de673SAkira Fujita * Extend the length of contiguous block (seq_blocks) 1431748de673SAkira Fujita * if extents are contiguous. 1432748de673SAkira Fujita */ 1433748de673SAkira Fujita if (ext4_can_extents_be_merged(orig_inode, 1434748de673SAkira Fujita ext_prev, ext_cur) && 1435748de673SAkira Fujita block_end >= le32_to_cpu(ext_cur->ee_block) && 1436748de673SAkira Fujita !last_extent) 1437748de673SAkira Fujita continue; 1438748de673SAkira Fujita 1439748de673SAkira Fujita /* Is original extent is uninitialized */ 1440748de673SAkira Fujita uninit = ext4_ext_is_uninitialized(ext_prev); 1441748de673SAkira Fujita 1442748de673SAkira Fujita data_offset_in_page = seq_start % blocks_per_page; 1443748de673SAkira Fujita 1444748de673SAkira Fujita /* 1445748de673SAkira Fujita * Calculate data blocks count that should be swapped 1446748de673SAkira Fujita * at the first page. 1447748de673SAkira Fujita */ 1448748de673SAkira Fujita if (data_offset_in_page + seq_blocks > blocks_per_page) { 1449748de673SAkira Fujita /* Swapped blocks are across pages */ 1450748de673SAkira Fujita block_len_in_page = 1451748de673SAkira Fujita blocks_per_page - data_offset_in_page; 1452748de673SAkira Fujita } else { 1453748de673SAkira Fujita /* Swapped blocks are in a page */ 1454748de673SAkira Fujita block_len_in_page = seq_blocks; 1455748de673SAkira Fujita } 1456748de673SAkira Fujita 1457748de673SAkira Fujita orig_page_offset = seq_start >> 1458748de673SAkira Fujita (PAGE_CACHE_SHIFT - orig_inode->i_blkbits); 1459748de673SAkira Fujita seq_end_page = (seq_start + seq_blocks - 1) >> 1460748de673SAkira Fujita (PAGE_CACHE_SHIFT - orig_inode->i_blkbits); 1461748de673SAkira Fujita seq_start = le32_to_cpu(ext_cur->ee_block); 1462748de673SAkira Fujita rest_blocks = seq_blocks; 1463748de673SAkira Fujita 1464fc04cb49SAkira Fujita /* 1465fc04cb49SAkira Fujita * Up semaphore to avoid following problems: 1466fc04cb49SAkira Fujita * a. transaction deadlock among ext4_journal_start, 1467fc04cb49SAkira Fujita * ->write_begin via pagefault, and jbd2_journal_commit 1468fc04cb49SAkira Fujita * b. racing with ->readpage, ->write_begin, and ext4_get_block 1469fc04cb49SAkira Fujita * in move_extent_per_page 1470fc04cb49SAkira Fujita */ 1471393d1d1dSDr. Tilmann Bubeck ext4_double_up_write_data_sem(orig_inode, donor_inode); 1472748de673SAkira Fujita 1473748de673SAkira Fujita while (orig_page_offset <= seq_end_page) { 1474748de673SAkira Fujita 1475748de673SAkira Fujita /* Swap original branches with new branches */ 1476f868a48dSAkira Fujita block_len_in_page = move_extent_per_page( 1477f868a48dSAkira Fujita o_filp, donor_inode, 1478748de673SAkira Fujita orig_page_offset, 1479748de673SAkira Fujita data_offset_in_page, 1480f868a48dSAkira Fujita block_len_in_page, uninit, 148103bd8b9bSDmitry Monakhov &ret); 1482f868a48dSAkira Fujita 1483748de673SAkira Fujita /* Count how many blocks we have exchanged */ 1484748de673SAkira Fujita *moved_len += block_len_in_page; 148503bd8b9bSDmitry Monakhov if (ret < 0) 1486fc04cb49SAkira Fujita break; 14872147b1a6SAkira Fujita if (*moved_len > len) { 148824676da4STheodore Ts'o EXT4_ERROR_INODE(orig_inode, 14892147b1a6SAkira Fujita "We replaced blocks too much! " 14902147b1a6SAkira Fujita "sum of replaced: %llu requested: %llu", 14912147b1a6SAkira Fujita *moved_len, len); 149203bd8b9bSDmitry Monakhov ret = -EIO; 1493fc04cb49SAkira Fujita break; 14942147b1a6SAkira Fujita } 1495748de673SAkira Fujita 1496f868a48dSAkira Fujita orig_page_offset++; 1497748de673SAkira Fujita data_offset_in_page = 0; 1498748de673SAkira Fujita rest_blocks -= block_len_in_page; 1499748de673SAkira Fujita if (rest_blocks > blocks_per_page) 1500748de673SAkira Fujita block_len_in_page = blocks_per_page; 1501748de673SAkira Fujita else 1502748de673SAkira Fujita block_len_in_page = rest_blocks; 1503748de673SAkira Fujita } 1504748de673SAkira Fujita 1505393d1d1dSDr. Tilmann Bubeck ext4_double_down_write_data_sem(orig_inode, donor_inode); 150603bd8b9bSDmitry Monakhov if (ret < 0) 1507fc04cb49SAkira Fujita break; 1508fc04cb49SAkira Fujita 1509748de673SAkira Fujita /* Decrease buffer counter */ 1510748de673SAkira Fujita if (holecheck_path) 1511748de673SAkira Fujita ext4_ext_drop_refs(holecheck_path); 151203bd8b9bSDmitry Monakhov ret = get_ext_path(orig_inode, seq_start, &holecheck_path); 151303bd8b9bSDmitry Monakhov if (ret) 1514748de673SAkira Fujita break; 1515748de673SAkira Fujita depth = holecheck_path->p_depth; 1516748de673SAkira Fujita 1517748de673SAkira Fujita /* Decrease buffer counter */ 1518748de673SAkira Fujita if (orig_path) 1519748de673SAkira Fujita ext4_ext_drop_refs(orig_path); 152003bd8b9bSDmitry Monakhov ret = get_ext_path(orig_inode, seq_start, &orig_path); 152103bd8b9bSDmitry Monakhov if (ret) 1522748de673SAkira Fujita break; 1523748de673SAkira Fujita 1524748de673SAkira Fujita ext_cur = holecheck_path[depth].p_ext; 1525748de673SAkira Fujita add_blocks = ext4_ext_get_actual_len(ext_cur); 1526748de673SAkira Fujita seq_blocks = 0; 1527748de673SAkira Fujita 1528748de673SAkira Fujita } 1529748de673SAkira Fujita out: 153094d7c16cSAkira Fujita if (*moved_len) { 153194d7c16cSAkira Fujita ext4_discard_preallocations(orig_inode); 153294d7c16cSAkira Fujita ext4_discard_preallocations(donor_inode); 153394d7c16cSAkira Fujita } 153494d7c16cSAkira Fujita 1535748de673SAkira Fujita if (orig_path) { 1536748de673SAkira Fujita ext4_ext_drop_refs(orig_path); 1537748de673SAkira Fujita kfree(orig_path); 1538748de673SAkira Fujita } 1539748de673SAkira Fujita if (holecheck_path) { 1540748de673SAkira Fujita ext4_ext_drop_refs(holecheck_path); 1541748de673SAkira Fujita kfree(holecheck_path); 1542748de673SAkira Fujita } 1543393d1d1dSDr. Tilmann Bubeck ext4_double_up_write_data_sem(orig_inode, donor_inode); 154417335dccSDmitry Monakhov ext4_inode_resume_unlocked_dio(orig_inode); 154517335dccSDmitry Monakhov ext4_inode_resume_unlocked_dio(donor_inode); 1546393d1d1dSDr. Tilmann Bubeck ext4_inode_double_unlock(orig_inode, donor_inode); 1547748de673SAkira Fujita 154803bd8b9bSDmitry Monakhov return ret; 1549748de673SAkira Fujita } 1550