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" 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; 42347fa6f1SAkira Fujita } else if ((*path)[ext_depth(inode)].p_ext == NULL) 43347fa6f1SAkira Fujita ret = -ENODATA; 44347fa6f1SAkira Fujita 45e8505970SAkira Fujita return ret; 46e8505970SAkira Fujita } 47748de673SAkira Fujita 48748de673SAkira Fujita /** 49748de673SAkira Fujita * copy_extent_status - Copy the extent's initialization status 50748de673SAkira Fujita * 51748de673SAkira Fujita * @src: an extent for getting initialize status 52748de673SAkira Fujita * @dest: an extent to be set the status 53748de673SAkira Fujita */ 54748de673SAkira Fujita static void 55748de673SAkira Fujita copy_extent_status(struct ext4_extent *src, struct ext4_extent *dest) 56748de673SAkira Fujita { 57748de673SAkira Fujita if (ext4_ext_is_uninitialized(src)) 58748de673SAkira Fujita ext4_ext_mark_uninitialized(dest); 59748de673SAkira Fujita else 60748de673SAkira Fujita dest->ee_len = cpu_to_le16(ext4_ext_get_actual_len(dest)); 61748de673SAkira Fujita } 62748de673SAkira Fujita 63748de673SAkira Fujita /** 64748de673SAkira Fujita * mext_next_extent - Search for the next extent and set it to "extent" 65748de673SAkira Fujita * 66748de673SAkira Fujita * @inode: inode which is searched 67748de673SAkira Fujita * @path: this will obtain data for the next extent 68748de673SAkira Fujita * @extent: pointer to the next extent we have just gotten 69748de673SAkira Fujita * 70748de673SAkira Fujita * Search the next extent in the array of ext4_ext_path structure (@path) 71748de673SAkira Fujita * and set it to ext4_extent structure (@extent). In addition, the member of 72748de673SAkira Fujita * @path (->p_ext) also points the next extent. Return 0 on success, 1 if 73748de673SAkira Fujita * ext4_ext_path structure refers to the last extent, or a negative error 74748de673SAkira Fujita * value on failure. 75748de673SAkira Fujita */ 76748de673SAkira Fujita static int 77748de673SAkira Fujita mext_next_extent(struct inode *inode, struct ext4_ext_path *path, 78748de673SAkira Fujita struct ext4_extent **extent) 79748de673SAkira Fujita { 80fc04cb49SAkira Fujita struct ext4_extent_header *eh; 81748de673SAkira Fujita int ppos, leaf_ppos = path->p_depth; 82748de673SAkira Fujita 83748de673SAkira Fujita ppos = leaf_ppos; 84748de673SAkira Fujita if (EXT_LAST_EXTENT(path[ppos].p_hdr) > path[ppos].p_ext) { 85748de673SAkira Fujita /* leaf block */ 86748de673SAkira Fujita *extent = ++path[ppos].p_ext; 87bf89d16fSTheodore Ts'o path[ppos].p_block = ext4_ext_pblock(path[ppos].p_ext); 88748de673SAkira Fujita return 0; 89748de673SAkira Fujita } 90748de673SAkira Fujita 91748de673SAkira Fujita while (--ppos >= 0) { 92748de673SAkira Fujita if (EXT_LAST_INDEX(path[ppos].p_hdr) > 93748de673SAkira Fujita path[ppos].p_idx) { 94748de673SAkira Fujita int cur_ppos = ppos; 95748de673SAkira Fujita 96748de673SAkira Fujita /* index block */ 97748de673SAkira Fujita path[ppos].p_idx++; 98bf89d16fSTheodore Ts'o path[ppos].p_block = ext4_idx_pblock(path[ppos].p_idx); 99748de673SAkira Fujita if (path[ppos+1].p_bh) 100748de673SAkira Fujita brelse(path[ppos+1].p_bh); 101748de673SAkira Fujita path[ppos+1].p_bh = 102748de673SAkira Fujita sb_bread(inode->i_sb, path[ppos].p_block); 103748de673SAkira Fujita if (!path[ppos+1].p_bh) 104748de673SAkira Fujita return -EIO; 105748de673SAkira Fujita path[ppos+1].p_hdr = 106748de673SAkira Fujita ext_block_hdr(path[ppos+1].p_bh); 107748de673SAkira Fujita 108748de673SAkira Fujita /* Halfway index block */ 109748de673SAkira Fujita while (++cur_ppos < leaf_ppos) { 110748de673SAkira Fujita path[cur_ppos].p_idx = 111748de673SAkira Fujita EXT_FIRST_INDEX(path[cur_ppos].p_hdr); 112748de673SAkira Fujita path[cur_ppos].p_block = 113bf89d16fSTheodore Ts'o ext4_idx_pblock(path[cur_ppos].p_idx); 114748de673SAkira Fujita if (path[cur_ppos+1].p_bh) 115748de673SAkira Fujita brelse(path[cur_ppos+1].p_bh); 116748de673SAkira Fujita path[cur_ppos+1].p_bh = sb_bread(inode->i_sb, 117748de673SAkira Fujita path[cur_ppos].p_block); 118748de673SAkira Fujita if (!path[cur_ppos+1].p_bh) 119748de673SAkira Fujita return -EIO; 120748de673SAkira Fujita path[cur_ppos+1].p_hdr = 121748de673SAkira Fujita ext_block_hdr(path[cur_ppos+1].p_bh); 122748de673SAkira Fujita } 123748de673SAkira Fujita 124fc04cb49SAkira Fujita path[leaf_ppos].p_ext = *extent = NULL; 125fc04cb49SAkira Fujita 126fc04cb49SAkira Fujita eh = path[leaf_ppos].p_hdr; 127fc04cb49SAkira Fujita if (le16_to_cpu(eh->eh_entries) == 0) 128fc04cb49SAkira Fujita /* empty leaf is found */ 129fc04cb49SAkira Fujita return -ENODATA; 130fc04cb49SAkira Fujita 131748de673SAkira Fujita /* leaf block */ 132748de673SAkira Fujita path[leaf_ppos].p_ext = *extent = 133748de673SAkira Fujita EXT_FIRST_EXTENT(path[leaf_ppos].p_hdr); 134fc04cb49SAkira Fujita path[leaf_ppos].p_block = 135bf89d16fSTheodore Ts'o ext4_ext_pblock(path[leaf_ppos].p_ext); 136748de673SAkira Fujita return 0; 137748de673SAkira Fujita } 138748de673SAkira Fujita } 139748de673SAkira Fujita /* We found the last extent */ 140748de673SAkira Fujita return 1; 141748de673SAkira Fujita } 142748de673SAkira Fujita 143748de673SAkira Fujita /** 144fc04cb49SAkira Fujita * double_down_write_data_sem - Acquire two inodes' write lock of i_data_sem 145748de673SAkira Fujita * 14603bd8b9bSDmitry Monakhov * Acquire write lock of i_data_sem of the two inodes 147748de673SAkira Fujita */ 148748de673SAkira Fujita static void 14903bd8b9bSDmitry Monakhov double_down_write_data_sem(struct inode *first, struct inode *second) 150748de673SAkira Fujita { 15103bd8b9bSDmitry Monakhov if (first < second) { 152748de673SAkira Fujita down_write(&EXT4_I(first)->i_data_sem); 15349bd22bcSAkira Fujita down_write_nested(&EXT4_I(second)->i_data_sem, SINGLE_DEPTH_NESTING); 15403bd8b9bSDmitry Monakhov } else { 15503bd8b9bSDmitry Monakhov down_write(&EXT4_I(second)->i_data_sem); 15603bd8b9bSDmitry Monakhov down_write_nested(&EXT4_I(first)->i_data_sem, SINGLE_DEPTH_NESTING); 15703bd8b9bSDmitry Monakhov 15803bd8b9bSDmitry Monakhov } 159748de673SAkira Fujita } 160748de673SAkira Fujita 161748de673SAkira Fujita /** 162fc04cb49SAkira Fujita * double_up_write_data_sem - Release two inodes' write lock of i_data_sem 163748de673SAkira Fujita * 164748de673SAkira Fujita * @orig_inode: original inode structure to be released its lock first 165748de673SAkira Fujita * @donor_inode: donor inode structure to be released its lock second 166fc04cb49SAkira Fujita * Release write lock of i_data_sem of two inodes (orig and donor). 167748de673SAkira Fujita */ 168748de673SAkira Fujita static void 169fc04cb49SAkira Fujita double_up_write_data_sem(struct inode *orig_inode, struct inode *donor_inode) 170748de673SAkira Fujita { 171748de673SAkira Fujita up_write(&EXT4_I(orig_inode)->i_data_sem); 172748de673SAkira Fujita up_write(&EXT4_I(donor_inode)->i_data_sem); 173748de673SAkira Fujita } 174748de673SAkira Fujita 175748de673SAkira Fujita /** 176748de673SAkira Fujita * mext_insert_across_blocks - Insert extents across leaf block 177748de673SAkira Fujita * 178748de673SAkira Fujita * @handle: journal handle 179748de673SAkira Fujita * @orig_inode: original inode 180748de673SAkira Fujita * @o_start: first original extent to be changed 181748de673SAkira Fujita * @o_end: last original extent to be changed 182748de673SAkira Fujita * @start_ext: first new extent to be inserted 183748de673SAkira Fujita * @new_ext: middle of new extent to be inserted 184748de673SAkira Fujita * @end_ext: last new extent to be inserted 185748de673SAkira Fujita * 186748de673SAkira Fujita * Allocate a new leaf block and insert extents into it. Return 0 on success, 187748de673SAkira Fujita * or a negative error value on failure. 188748de673SAkira Fujita */ 189748de673SAkira Fujita static int 190748de673SAkira Fujita mext_insert_across_blocks(handle_t *handle, struct inode *orig_inode, 191748de673SAkira Fujita struct ext4_extent *o_start, struct ext4_extent *o_end, 192748de673SAkira Fujita struct ext4_extent *start_ext, struct ext4_extent *new_ext, 193748de673SAkira Fujita struct ext4_extent *end_ext) 194748de673SAkira Fujita { 195748de673SAkira Fujita struct ext4_ext_path *orig_path = NULL; 196748de673SAkira Fujita ext4_lblk_t eblock = 0; 197748de673SAkira Fujita int new_flag = 0; 198748de673SAkira Fujita int end_flag = 0; 199748de673SAkira Fujita int err = 0; 200748de673SAkira Fujita 201748de673SAkira Fujita if (start_ext->ee_len && new_ext->ee_len && end_ext->ee_len) { 202748de673SAkira Fujita if (o_start == o_end) { 203748de673SAkira Fujita 204748de673SAkira Fujita /* start_ext new_ext end_ext 205748de673SAkira Fujita * donor |---------|-----------|--------| 206748de673SAkira Fujita * orig |------------------------------| 207748de673SAkira Fujita */ 208748de673SAkira Fujita end_flag = 1; 209748de673SAkira Fujita } else { 210748de673SAkira Fujita 211748de673SAkira Fujita /* start_ext new_ext end_ext 212748de673SAkira Fujita * donor |---------|----------|---------| 213748de673SAkira Fujita * orig |---------------|--------------| 214748de673SAkira Fujita */ 215748de673SAkira Fujita o_end->ee_block = end_ext->ee_block; 216748de673SAkira Fujita o_end->ee_len = end_ext->ee_len; 217bf89d16fSTheodore Ts'o ext4_ext_store_pblock(o_end, ext4_ext_pblock(end_ext)); 218748de673SAkira Fujita } 219748de673SAkira Fujita 220748de673SAkira Fujita o_start->ee_len = start_ext->ee_len; 2215fd5249aSAkira Fujita eblock = le32_to_cpu(start_ext->ee_block); 222748de673SAkira Fujita new_flag = 1; 223748de673SAkira Fujita 224748de673SAkira Fujita } else if (start_ext->ee_len && new_ext->ee_len && 225748de673SAkira Fujita !end_ext->ee_len && o_start == o_end) { 226748de673SAkira Fujita 227748de673SAkira Fujita /* start_ext new_ext 228748de673SAkira Fujita * donor |--------------|---------------| 229748de673SAkira Fujita * orig |------------------------------| 230748de673SAkira Fujita */ 231748de673SAkira Fujita o_start->ee_len = start_ext->ee_len; 2325fd5249aSAkira Fujita eblock = le32_to_cpu(start_ext->ee_block); 233748de673SAkira Fujita new_flag = 1; 234748de673SAkira Fujita 235748de673SAkira Fujita } else if (!start_ext->ee_len && new_ext->ee_len && 236748de673SAkira Fujita end_ext->ee_len && o_start == o_end) { 237748de673SAkira Fujita 238748de673SAkira Fujita /* new_ext end_ext 239748de673SAkira Fujita * donor |--------------|---------------| 240748de673SAkira Fujita * orig |------------------------------| 241748de673SAkira Fujita */ 242748de673SAkira Fujita o_end->ee_block = end_ext->ee_block; 243748de673SAkira Fujita o_end->ee_len = end_ext->ee_len; 244bf89d16fSTheodore Ts'o ext4_ext_store_pblock(o_end, ext4_ext_pblock(end_ext)); 245748de673SAkira Fujita 246748de673SAkira Fujita /* 247748de673SAkira Fujita * Set 0 to the extent block if new_ext was 248748de673SAkira Fujita * the first block. 249748de673SAkira Fujita */ 250748de673SAkira Fujita if (new_ext->ee_block) 251748de673SAkira Fujita eblock = le32_to_cpu(new_ext->ee_block); 252748de673SAkira Fujita 253748de673SAkira Fujita new_flag = 1; 254748de673SAkira Fujita } else { 255748de673SAkira Fujita ext4_debug("ext4 move extent: Unexpected insert case\n"); 256748de673SAkira Fujita return -EIO; 257748de673SAkira Fujita } 258748de673SAkira Fujita 259748de673SAkira Fujita if (new_flag) { 260e8505970SAkira Fujita err = get_ext_path(orig_inode, eblock, &orig_path); 261347fa6f1SAkira Fujita if (err) 262748de673SAkira Fujita goto out; 263748de673SAkira Fujita 264748de673SAkira Fujita if (ext4_ext_insert_extent(handle, orig_inode, 2650031462bSMingming Cao orig_path, new_ext, 0)) 266748de673SAkira Fujita goto out; 267748de673SAkira Fujita } 268748de673SAkira Fujita 269748de673SAkira Fujita if (end_flag) { 270e8505970SAkira Fujita err = get_ext_path(orig_inode, 271e8505970SAkira Fujita le32_to_cpu(end_ext->ee_block) - 1, &orig_path); 272347fa6f1SAkira Fujita if (err) 273748de673SAkira Fujita goto out; 274748de673SAkira Fujita 275748de673SAkira Fujita if (ext4_ext_insert_extent(handle, orig_inode, 2760031462bSMingming Cao orig_path, end_ext, 0)) 277748de673SAkira Fujita goto out; 278748de673SAkira Fujita } 279748de673SAkira Fujita out: 280748de673SAkira Fujita if (orig_path) { 281748de673SAkira Fujita ext4_ext_drop_refs(orig_path); 282748de673SAkira Fujita kfree(orig_path); 283748de673SAkira Fujita } 284748de673SAkira Fujita 285748de673SAkira Fujita return err; 286748de673SAkira Fujita 287748de673SAkira Fujita } 288748de673SAkira Fujita 289748de673SAkira Fujita /** 290748de673SAkira Fujita * mext_insert_inside_block - Insert new extent to the extent block 291748de673SAkira Fujita * 292748de673SAkira Fujita * @o_start: first original extent to be moved 293748de673SAkira Fujita * @o_end: last original extent to be moved 294748de673SAkira Fujita * @start_ext: first new extent to be inserted 295748de673SAkira Fujita * @new_ext: middle of new extent to be inserted 296748de673SAkira Fujita * @end_ext: last new extent to be inserted 297748de673SAkira Fujita * @eh: extent header of target leaf block 298748de673SAkira Fujita * @range_to_move: used to decide how to insert extent 299748de673SAkira Fujita * 300748de673SAkira Fujita * Insert extents into the leaf block. The extent (@o_start) is overwritten 301748de673SAkira Fujita * by inserted extents. 302748de673SAkira Fujita */ 303748de673SAkira Fujita static void 304748de673SAkira Fujita mext_insert_inside_block(struct ext4_extent *o_start, 305748de673SAkira Fujita struct ext4_extent *o_end, 306748de673SAkira Fujita struct ext4_extent *start_ext, 307748de673SAkira Fujita struct ext4_extent *new_ext, 308748de673SAkira Fujita struct ext4_extent *end_ext, 309748de673SAkira Fujita struct ext4_extent_header *eh, 310748de673SAkira Fujita int range_to_move) 311748de673SAkira Fujita { 312748de673SAkira Fujita int i = 0; 313748de673SAkira Fujita unsigned long len; 314748de673SAkira Fujita 315748de673SAkira Fujita /* Move the existing extents */ 316748de673SAkira Fujita if (range_to_move && o_end < EXT_LAST_EXTENT(eh)) { 317748de673SAkira Fujita len = (unsigned long)(EXT_LAST_EXTENT(eh) + 1) - 318748de673SAkira Fujita (unsigned long)(o_end + 1); 319748de673SAkira Fujita memmove(o_end + 1 + range_to_move, o_end + 1, len); 320748de673SAkira Fujita } 321748de673SAkira Fujita 322748de673SAkira Fujita /* Insert start entry */ 323748de673SAkira Fujita if (start_ext->ee_len) 324748de673SAkira Fujita o_start[i++].ee_len = start_ext->ee_len; 325748de673SAkira Fujita 326748de673SAkira Fujita /* Insert new entry */ 327748de673SAkira Fujita if (new_ext->ee_len) { 328748de673SAkira Fujita o_start[i] = *new_ext; 329bf89d16fSTheodore Ts'o ext4_ext_store_pblock(&o_start[i++], ext4_ext_pblock(new_ext)); 330748de673SAkira Fujita } 331748de673SAkira Fujita 332748de673SAkira Fujita /* Insert end entry */ 333748de673SAkira Fujita if (end_ext->ee_len) 334748de673SAkira Fujita o_start[i] = *end_ext; 335748de673SAkira Fujita 336748de673SAkira Fujita /* Increment the total entries counter on the extent block */ 337748de673SAkira Fujita le16_add_cpu(&eh->eh_entries, range_to_move); 338748de673SAkira Fujita } 339748de673SAkira Fujita 340748de673SAkira Fujita /** 341748de673SAkira Fujita * mext_insert_extents - Insert new extent 342748de673SAkira Fujita * 343748de673SAkira Fujita * @handle: journal handle 344748de673SAkira Fujita * @orig_inode: original inode 345748de673SAkira Fujita * @orig_path: path indicates first extent to be changed 346748de673SAkira Fujita * @o_start: first original extent to be changed 347748de673SAkira Fujita * @o_end: last original extent to be changed 348748de673SAkira Fujita * @start_ext: first new extent to be inserted 349748de673SAkira Fujita * @new_ext: middle of new extent to be inserted 350748de673SAkira Fujita * @end_ext: last new extent to be inserted 351748de673SAkira Fujita * 352748de673SAkira Fujita * Call the function to insert extents. If we cannot add more extents into 353748de673SAkira Fujita * the leaf block, we call mext_insert_across_blocks() to create a 354748de673SAkira Fujita * new leaf block. Otherwise call mext_insert_inside_block(). Return 0 355748de673SAkira Fujita * on success, or a negative error value on failure. 356748de673SAkira Fujita */ 357748de673SAkira Fujita static int 358748de673SAkira Fujita mext_insert_extents(handle_t *handle, struct inode *orig_inode, 359748de673SAkira Fujita struct ext4_ext_path *orig_path, 360748de673SAkira Fujita struct ext4_extent *o_start, 361748de673SAkira Fujita struct ext4_extent *o_end, 362748de673SAkira Fujita struct ext4_extent *start_ext, 363748de673SAkira Fujita struct ext4_extent *new_ext, 364748de673SAkira Fujita struct ext4_extent *end_ext) 365748de673SAkira Fujita { 366748de673SAkira Fujita struct ext4_extent_header *eh; 367748de673SAkira Fujita unsigned long need_slots, slots_range; 368748de673SAkira Fujita int range_to_move, depth, ret; 369748de673SAkira Fujita 370748de673SAkira Fujita /* 371748de673SAkira Fujita * The extents need to be inserted 372748de673SAkira Fujita * start_extent + new_extent + end_extent. 373748de673SAkira Fujita */ 374748de673SAkira Fujita need_slots = (start_ext->ee_len ? 1 : 0) + (end_ext->ee_len ? 1 : 0) + 375748de673SAkira Fujita (new_ext->ee_len ? 1 : 0); 376748de673SAkira Fujita 377748de673SAkira Fujita /* The number of slots between start and end */ 378748de673SAkira Fujita slots_range = ((unsigned long)(o_end + 1) - (unsigned long)o_start + 1) 379748de673SAkira Fujita / sizeof(struct ext4_extent); 380748de673SAkira Fujita 381748de673SAkira Fujita /* Range to move the end of extent */ 382748de673SAkira Fujita range_to_move = need_slots - slots_range; 383748de673SAkira Fujita depth = orig_path->p_depth; 384748de673SAkira Fujita orig_path += depth; 385748de673SAkira Fujita eh = orig_path->p_hdr; 386748de673SAkira Fujita 387748de673SAkira Fujita if (depth) { 388748de673SAkira Fujita /* Register to journal */ 389748de673SAkira Fujita ret = ext4_journal_get_write_access(handle, orig_path->p_bh); 390748de673SAkira Fujita if (ret) 391748de673SAkira Fujita return ret; 392748de673SAkira Fujita } 393748de673SAkira Fujita 394748de673SAkira Fujita /* Expansion */ 395748de673SAkira Fujita if (range_to_move > 0 && 396748de673SAkira Fujita (range_to_move > le16_to_cpu(eh->eh_max) 397748de673SAkira Fujita - le16_to_cpu(eh->eh_entries))) { 398748de673SAkira Fujita 399748de673SAkira Fujita ret = mext_insert_across_blocks(handle, orig_inode, o_start, 400748de673SAkira Fujita o_end, start_ext, new_ext, end_ext); 401748de673SAkira Fujita if (ret < 0) 402748de673SAkira Fujita return ret; 403748de673SAkira Fujita } else 404748de673SAkira Fujita mext_insert_inside_block(o_start, o_end, start_ext, new_ext, 405748de673SAkira Fujita end_ext, eh, range_to_move); 406748de673SAkira Fujita 407748de673SAkira Fujita if (depth) { 408748de673SAkira Fujita ret = ext4_handle_dirty_metadata(handle, orig_inode, 409748de673SAkira Fujita orig_path->p_bh); 410748de673SAkira Fujita if (ret) 411748de673SAkira Fujita return ret; 412748de673SAkira Fujita } else { 413748de673SAkira Fujita ret = ext4_mark_inode_dirty(handle, orig_inode); 414748de673SAkira Fujita if (ret < 0) 415748de673SAkira Fujita return ret; 416748de673SAkira Fujita } 417748de673SAkira Fujita 418748de673SAkira Fujita return 0; 419748de673SAkira Fujita } 420748de673SAkira Fujita 421748de673SAkira Fujita /** 422748de673SAkira Fujita * mext_leaf_block - Move one leaf extent block into the inode. 423748de673SAkira Fujita * 424748de673SAkira Fujita * @handle: journal handle 425748de673SAkira Fujita * @orig_inode: original inode 426748de673SAkira Fujita * @orig_path: path indicates first extent to be changed 427748de673SAkira Fujita * @dext: donor extent 428748de673SAkira Fujita * @from: start offset on the target file 429748de673SAkira Fujita * 430748de673SAkira Fujita * In order to insert extents into the leaf block, we must divide the extent 431748de673SAkira Fujita * in the leaf block into three extents. The one is located to be inserted 432748de673SAkira Fujita * extents, and the others are located around it. 433748de673SAkira Fujita * 434748de673SAkira Fujita * Therefore, this function creates structures to save extents of the leaf 435748de673SAkira Fujita * block, and inserts extents by calling mext_insert_extents() with 436748de673SAkira Fujita * created extents. Return 0 on success, or a negative error value on failure. 437748de673SAkira Fujita */ 438748de673SAkira Fujita static int 439748de673SAkira Fujita mext_leaf_block(handle_t *handle, struct inode *orig_inode, 440748de673SAkira Fujita struct ext4_ext_path *orig_path, struct ext4_extent *dext, 441748de673SAkira Fujita ext4_lblk_t *from) 442748de673SAkira Fujita { 443748de673SAkira Fujita struct ext4_extent *oext, *o_start, *o_end, *prev_ext; 444748de673SAkira Fujita struct ext4_extent new_ext, start_ext, end_ext; 445748de673SAkira Fujita ext4_lblk_t new_ext_end; 446748de673SAkira Fujita int oext_alen, new_ext_alen, end_ext_alen; 447748de673SAkira Fujita int depth = ext_depth(orig_inode); 448748de673SAkira Fujita int ret; 449748de673SAkira Fujita 450c26d0badSSteven Liu start_ext.ee_block = end_ext.ee_block = 0; 451748de673SAkira Fujita o_start = o_end = oext = orig_path[depth].p_ext; 452748de673SAkira Fujita oext_alen = ext4_ext_get_actual_len(oext); 453748de673SAkira Fujita start_ext.ee_len = end_ext.ee_len = 0; 454748de673SAkira Fujita 455748de673SAkira Fujita new_ext.ee_block = cpu_to_le32(*from); 456bf89d16fSTheodore Ts'o ext4_ext_store_pblock(&new_ext, ext4_ext_pblock(dext)); 457748de673SAkira Fujita new_ext.ee_len = dext->ee_len; 458748de673SAkira Fujita new_ext_alen = ext4_ext_get_actual_len(&new_ext); 459748de673SAkira Fujita new_ext_end = le32_to_cpu(new_ext.ee_block) + new_ext_alen - 1; 460748de673SAkira Fujita 461748de673SAkira Fujita /* 462748de673SAkira Fujita * Case: original extent is first 463748de673SAkira Fujita * oext |--------| 464748de673SAkira Fujita * new_ext |--| 465748de673SAkira Fujita * start_ext |--| 466748de673SAkira Fujita */ 467748de673SAkira Fujita if (le32_to_cpu(oext->ee_block) < le32_to_cpu(new_ext.ee_block) && 468748de673SAkira Fujita le32_to_cpu(new_ext.ee_block) < 469748de673SAkira Fujita le32_to_cpu(oext->ee_block) + oext_alen) { 470748de673SAkira Fujita start_ext.ee_len = cpu_to_le16(le32_to_cpu(new_ext.ee_block) - 471748de673SAkira Fujita le32_to_cpu(oext->ee_block)); 4725fd5249aSAkira Fujita start_ext.ee_block = oext->ee_block; 473748de673SAkira Fujita copy_extent_status(oext, &start_ext); 474748de673SAkira Fujita } else if (oext > EXT_FIRST_EXTENT(orig_path[depth].p_hdr)) { 475748de673SAkira Fujita prev_ext = oext - 1; 476748de673SAkira Fujita /* 477748de673SAkira Fujita * We can merge new_ext into previous extent, 478748de673SAkira Fujita * if these are contiguous and same extent type. 479748de673SAkira Fujita */ 480748de673SAkira Fujita if (ext4_can_extents_be_merged(orig_inode, prev_ext, 481748de673SAkira Fujita &new_ext)) { 482748de673SAkira Fujita o_start = prev_ext; 483748de673SAkira Fujita start_ext.ee_len = cpu_to_le16( 484748de673SAkira Fujita ext4_ext_get_actual_len(prev_ext) + 485748de673SAkira Fujita new_ext_alen); 4865fd5249aSAkira Fujita start_ext.ee_block = oext->ee_block; 487748de673SAkira Fujita copy_extent_status(prev_ext, &start_ext); 488748de673SAkira Fujita new_ext.ee_len = 0; 489748de673SAkira Fujita } 490748de673SAkira Fujita } 491748de673SAkira Fujita 492748de673SAkira Fujita /* 493748de673SAkira Fujita * Case: new_ext_end must be less than oext 494748de673SAkira Fujita * oext |-----------| 495748de673SAkira Fujita * new_ext |-------| 496748de673SAkira Fujita */ 4972147b1a6SAkira Fujita if (le32_to_cpu(oext->ee_block) + oext_alen - 1 < new_ext_end) { 49824676da4STheodore Ts'o EXT4_ERROR_INODE(orig_inode, 4992147b1a6SAkira Fujita "new_ext_end(%u) should be less than or equal to " 5002147b1a6SAkira Fujita "oext->ee_block(%u) + oext_alen(%d) - 1", 5012147b1a6SAkira Fujita new_ext_end, le32_to_cpu(oext->ee_block), 5022147b1a6SAkira Fujita oext_alen); 5032147b1a6SAkira Fujita ret = -EIO; 5042147b1a6SAkira Fujita goto out; 5052147b1a6SAkira Fujita } 506748de673SAkira Fujita 507748de673SAkira Fujita /* 508748de673SAkira Fujita * Case: new_ext is smaller than original extent 509748de673SAkira Fujita * oext |---------------| 510748de673SAkira Fujita * new_ext |-----------| 511748de673SAkira Fujita * end_ext |---| 512748de673SAkira Fujita */ 513748de673SAkira Fujita if (le32_to_cpu(oext->ee_block) <= new_ext_end && 514748de673SAkira Fujita new_ext_end < le32_to_cpu(oext->ee_block) + oext_alen - 1) { 515748de673SAkira Fujita end_ext.ee_len = 516748de673SAkira Fujita cpu_to_le16(le32_to_cpu(oext->ee_block) + 517748de673SAkira Fujita oext_alen - 1 - new_ext_end); 518748de673SAkira Fujita copy_extent_status(oext, &end_ext); 519748de673SAkira Fujita end_ext_alen = ext4_ext_get_actual_len(&end_ext); 520748de673SAkira Fujita ext4_ext_store_pblock(&end_ext, 521bf89d16fSTheodore Ts'o (ext4_ext_pblock(o_end) + oext_alen - end_ext_alen)); 522748de673SAkira Fujita end_ext.ee_block = 523748de673SAkira Fujita cpu_to_le32(le32_to_cpu(o_end->ee_block) + 524748de673SAkira Fujita oext_alen - end_ext_alen); 525748de673SAkira Fujita } 526748de673SAkira Fujita 527748de673SAkira Fujita ret = mext_insert_extents(handle, orig_inode, orig_path, o_start, 528748de673SAkira Fujita o_end, &start_ext, &new_ext, &end_ext); 5292147b1a6SAkira Fujita out: 530748de673SAkira Fujita return ret; 531748de673SAkira Fujita } 532748de673SAkira Fujita 533748de673SAkira Fujita /** 534748de673SAkira Fujita * mext_calc_swap_extents - Calculate extents for extent swapping. 535748de673SAkira Fujita * 536748de673SAkira Fujita * @tmp_dext: the extent that will belong to the original inode 537748de673SAkira Fujita * @tmp_oext: the extent that will belong to the donor inode 538748de673SAkira Fujita * @orig_off: block offset of original inode 539748de673SAkira Fujita * @donor_off: block offset of donor inode 54092c28159SAkira Fujita * @max_count: the maximum length of extents 541c40ce3c9SAkira Fujita * 542c40ce3c9SAkira Fujita * Return 0 on success, or a negative error value on failure. 543748de673SAkira Fujita */ 544c40ce3c9SAkira Fujita static int 545748de673SAkira Fujita mext_calc_swap_extents(struct ext4_extent *tmp_dext, 546748de673SAkira Fujita struct ext4_extent *tmp_oext, 547748de673SAkira Fujita ext4_lblk_t orig_off, ext4_lblk_t donor_off, 548748de673SAkira Fujita ext4_lblk_t max_count) 549748de673SAkira Fujita { 550748de673SAkira Fujita ext4_lblk_t diff, orig_diff; 551748de673SAkira Fujita struct ext4_extent dext_old, oext_old; 552748de673SAkira Fujita 553c40ce3c9SAkira Fujita BUG_ON(orig_off != donor_off); 554c40ce3c9SAkira Fujita 555c40ce3c9SAkira Fujita /* original and donor extents have to cover the same block offset */ 556c40ce3c9SAkira Fujita if (orig_off < le32_to_cpu(tmp_oext->ee_block) || 557c40ce3c9SAkira Fujita le32_to_cpu(tmp_oext->ee_block) + 558c40ce3c9SAkira Fujita ext4_ext_get_actual_len(tmp_oext) - 1 < orig_off) 559c40ce3c9SAkira Fujita return -ENODATA; 560c40ce3c9SAkira Fujita 561c40ce3c9SAkira Fujita if (orig_off < le32_to_cpu(tmp_dext->ee_block) || 562c40ce3c9SAkira Fujita le32_to_cpu(tmp_dext->ee_block) + 563c40ce3c9SAkira Fujita ext4_ext_get_actual_len(tmp_dext) - 1 < orig_off) 564c40ce3c9SAkira Fujita return -ENODATA; 565c40ce3c9SAkira Fujita 566748de673SAkira Fujita dext_old = *tmp_dext; 567748de673SAkira Fujita oext_old = *tmp_oext; 568748de673SAkira Fujita 569748de673SAkira Fujita /* When tmp_dext is too large, pick up the target range. */ 570748de673SAkira Fujita diff = donor_off - le32_to_cpu(tmp_dext->ee_block); 571748de673SAkira Fujita 572bf89d16fSTheodore Ts'o ext4_ext_store_pblock(tmp_dext, ext4_ext_pblock(tmp_dext) + diff); 573748de673SAkira Fujita tmp_dext->ee_block = 574748de673SAkira Fujita cpu_to_le32(le32_to_cpu(tmp_dext->ee_block) + diff); 575748de673SAkira Fujita tmp_dext->ee_len = cpu_to_le16(le16_to_cpu(tmp_dext->ee_len) - diff); 576748de673SAkira Fujita 577748de673SAkira Fujita if (max_count < ext4_ext_get_actual_len(tmp_dext)) 578748de673SAkira Fujita tmp_dext->ee_len = cpu_to_le16(max_count); 579748de673SAkira Fujita 580748de673SAkira Fujita orig_diff = orig_off - le32_to_cpu(tmp_oext->ee_block); 581bf89d16fSTheodore Ts'o ext4_ext_store_pblock(tmp_oext, ext4_ext_pblock(tmp_oext) + orig_diff); 582748de673SAkira Fujita 583748de673SAkira Fujita /* Adjust extent length if donor extent is larger than orig */ 584748de673SAkira Fujita if (ext4_ext_get_actual_len(tmp_dext) > 585748de673SAkira Fujita ext4_ext_get_actual_len(tmp_oext) - orig_diff) 586748de673SAkira Fujita tmp_dext->ee_len = cpu_to_le16(le16_to_cpu(tmp_oext->ee_len) - 587748de673SAkira Fujita orig_diff); 588748de673SAkira Fujita 589748de673SAkira Fujita tmp_oext->ee_len = cpu_to_le16(ext4_ext_get_actual_len(tmp_dext)); 590748de673SAkira Fujita 591748de673SAkira Fujita copy_extent_status(&oext_old, tmp_dext); 592748de673SAkira Fujita copy_extent_status(&dext_old, tmp_oext); 593c40ce3c9SAkira Fujita 594c40ce3c9SAkira Fujita return 0; 595748de673SAkira Fujita } 596748de673SAkira Fujita 597748de673SAkira Fujita /** 598748de673SAkira Fujita * mext_replace_branches - Replace original extents with new extents 599748de673SAkira Fujita * 600748de673SAkira Fujita * @handle: journal handle 601748de673SAkira Fujita * @orig_inode: original inode 602748de673SAkira Fujita * @donor_inode: donor inode 603748de673SAkira Fujita * @from: block offset of orig_inode 604748de673SAkira Fujita * @count: block count to be replaced 605f868a48dSAkira Fujita * @err: pointer to save return value 606748de673SAkira Fujita * 607748de673SAkira Fujita * Replace original inode extents and donor inode extents page by page. 608748de673SAkira Fujita * We implement this replacement in the following three steps: 609748de673SAkira Fujita * 1. Save the block information of original and donor inodes into 610748de673SAkira Fujita * dummy extents. 611748de673SAkira Fujita * 2. Change the block information of original inode to point at the 612748de673SAkira Fujita * donor inode blocks. 613748de673SAkira Fujita * 3. Change the block information of donor inode to point at the saved 614748de673SAkira Fujita * original inode blocks in the dummy extents. 615748de673SAkira Fujita * 616f868a48dSAkira Fujita * Return replaced block count. 617748de673SAkira Fujita */ 618748de673SAkira Fujita static int 619748de673SAkira Fujita mext_replace_branches(handle_t *handle, struct inode *orig_inode, 620748de673SAkira Fujita struct inode *donor_inode, ext4_lblk_t from, 621f868a48dSAkira Fujita ext4_lblk_t count, int *err) 622748de673SAkira Fujita { 623748de673SAkira Fujita struct ext4_ext_path *orig_path = NULL; 624748de673SAkira Fujita struct ext4_ext_path *donor_path = NULL; 625748de673SAkira Fujita struct ext4_extent *oext, *dext; 626748de673SAkira Fujita struct ext4_extent tmp_dext, tmp_oext; 627748de673SAkira Fujita ext4_lblk_t orig_off = from, donor_off = from; 628748de673SAkira Fujita int depth; 629748de673SAkira Fujita int replaced_count = 0; 630748de673SAkira Fujita int dext_alen; 631748de673SAkira Fujita 632ac48b0a1SAkira Fujita /* Protect extent trees against block allocations via delalloc */ 633ac48b0a1SAkira Fujita double_down_write_data_sem(orig_inode, donor_inode); 634ac48b0a1SAkira Fujita 635748de673SAkira Fujita /* Get the original extent for the block "orig_off" */ 636f868a48dSAkira Fujita *err = get_ext_path(orig_inode, orig_off, &orig_path); 637f868a48dSAkira Fujita if (*err) 638748de673SAkira Fujita goto out; 639748de673SAkira Fujita 640748de673SAkira Fujita /* Get the donor extent for the head */ 641f868a48dSAkira Fujita *err = get_ext_path(donor_inode, donor_off, &donor_path); 642f868a48dSAkira Fujita if (*err) 643748de673SAkira Fujita goto out; 644748de673SAkira Fujita depth = ext_depth(orig_inode); 645748de673SAkira Fujita oext = orig_path[depth].p_ext; 646748de673SAkira Fujita tmp_oext = *oext; 647748de673SAkira Fujita 648748de673SAkira Fujita depth = ext_depth(donor_inode); 649748de673SAkira Fujita dext = donor_path[depth].p_ext; 650748de673SAkira Fujita tmp_dext = *dext; 651748de673SAkira Fujita 652f868a48dSAkira Fujita *err = mext_calc_swap_extents(&tmp_dext, &tmp_oext, orig_off, 653748de673SAkira Fujita donor_off, count); 654f868a48dSAkira Fujita if (*err) 655c40ce3c9SAkira Fujita goto out; 656748de673SAkira Fujita 657748de673SAkira Fujita /* Loop for the donor extents */ 658748de673SAkira Fujita while (1) { 659748de673SAkira Fujita /* The extent for donor must be found. */ 6602147b1a6SAkira Fujita if (!dext) { 66124676da4STheodore Ts'o EXT4_ERROR_INODE(donor_inode, 6622147b1a6SAkira Fujita "The extent for donor must be found"); 663f868a48dSAkira Fujita *err = -EIO; 6642147b1a6SAkira Fujita goto out; 6652147b1a6SAkira Fujita } else if (donor_off != le32_to_cpu(tmp_dext.ee_block)) { 66624676da4STheodore Ts'o EXT4_ERROR_INODE(donor_inode, 6672147b1a6SAkira Fujita "Donor offset(%u) and the first block of donor " 6682147b1a6SAkira Fujita "extent(%u) should be equal", 6692147b1a6SAkira Fujita donor_off, 6702147b1a6SAkira Fujita le32_to_cpu(tmp_dext.ee_block)); 671f868a48dSAkira Fujita *err = -EIO; 6722147b1a6SAkira Fujita goto out; 6732147b1a6SAkira Fujita } 674748de673SAkira Fujita 675748de673SAkira Fujita /* Set donor extent to orig extent */ 676f868a48dSAkira Fujita *err = mext_leaf_block(handle, orig_inode, 677748de673SAkira Fujita orig_path, &tmp_dext, &orig_off); 678f868a48dSAkira Fujita if (*err) 679748de673SAkira Fujita goto out; 680748de673SAkira Fujita 681748de673SAkira Fujita /* Set orig extent to donor extent */ 682f868a48dSAkira Fujita *err = mext_leaf_block(handle, donor_inode, 683748de673SAkira Fujita donor_path, &tmp_oext, &donor_off); 684f868a48dSAkira Fujita if (*err) 685748de673SAkira Fujita goto out; 686748de673SAkira Fujita 687748de673SAkira Fujita dext_alen = ext4_ext_get_actual_len(&tmp_dext); 688748de673SAkira Fujita replaced_count += dext_alen; 689748de673SAkira Fujita donor_off += dext_alen; 690748de673SAkira Fujita orig_off += dext_alen; 691748de673SAkira Fujita 692748de673SAkira Fujita /* Already moved the expected blocks */ 693748de673SAkira Fujita if (replaced_count >= count) 694748de673SAkira Fujita break; 695748de673SAkira Fujita 696748de673SAkira Fujita if (orig_path) 697748de673SAkira Fujita ext4_ext_drop_refs(orig_path); 698f868a48dSAkira Fujita *err = get_ext_path(orig_inode, orig_off, &orig_path); 699f868a48dSAkira Fujita if (*err) 700748de673SAkira Fujita goto out; 701748de673SAkira Fujita depth = ext_depth(orig_inode); 702748de673SAkira Fujita oext = orig_path[depth].p_ext; 703748de673SAkira Fujita tmp_oext = *oext; 704748de673SAkira Fujita 705748de673SAkira Fujita if (donor_path) 706748de673SAkira Fujita ext4_ext_drop_refs(donor_path); 707f868a48dSAkira Fujita *err = get_ext_path(donor_inode, donor_off, &donor_path); 708f868a48dSAkira Fujita if (*err) 709748de673SAkira Fujita goto out; 710748de673SAkira Fujita depth = ext_depth(donor_inode); 711748de673SAkira Fujita dext = donor_path[depth].p_ext; 712748de673SAkira Fujita tmp_dext = *dext; 713748de673SAkira Fujita 714f868a48dSAkira Fujita *err = mext_calc_swap_extents(&tmp_dext, &tmp_oext, orig_off, 715c40ce3c9SAkira Fujita donor_off, count - replaced_count); 716f868a48dSAkira Fujita if (*err) 717c40ce3c9SAkira Fujita goto out; 718748de673SAkira Fujita } 719748de673SAkira Fujita 720748de673SAkira Fujita out: 721748de673SAkira Fujita if (orig_path) { 722748de673SAkira Fujita ext4_ext_drop_refs(orig_path); 723748de673SAkira Fujita kfree(orig_path); 724748de673SAkira Fujita } 725748de673SAkira Fujita if (donor_path) { 726748de673SAkira Fujita ext4_ext_drop_refs(donor_path); 727748de673SAkira Fujita kfree(donor_path); 728748de673SAkira Fujita } 729748de673SAkira Fujita 730ac48b0a1SAkira Fujita ext4_ext_invalidate_cache(orig_inode); 731ac48b0a1SAkira Fujita ext4_ext_invalidate_cache(donor_inode); 732ac48b0a1SAkira Fujita 733ac48b0a1SAkira Fujita double_up_write_data_sem(orig_inode, donor_inode); 734ac48b0a1SAkira Fujita 735f868a48dSAkira Fujita return replaced_count; 736748de673SAkira Fujita } 737748de673SAkira Fujita 738748de673SAkira Fujita /** 739748de673SAkira Fujita * move_extent_per_page - Move extent data per page 740748de673SAkira Fujita * 741748de673SAkira Fujita * @o_filp: file structure of original file 742748de673SAkira Fujita * @donor_inode: donor inode 743748de673SAkira Fujita * @orig_page_offset: page index on original file 744748de673SAkira Fujita * @data_offset_in_page: block index where data swapping starts 745748de673SAkira Fujita * @block_len_in_page: the number of blocks to be swapped 746748de673SAkira Fujita * @uninit: orig extent is uninitialized or not 747f868a48dSAkira Fujita * @err: pointer to save return value 748748de673SAkira Fujita * 749748de673SAkira Fujita * Save the data in original inode blocks and replace original inode extents 750748de673SAkira Fujita * with donor inode extents by calling mext_replace_branches(). 751f868a48dSAkira Fujita * Finally, write out the saved data in new original inode blocks. Return 752f868a48dSAkira Fujita * replaced block count. 753748de673SAkira Fujita */ 754748de673SAkira Fujita static int 75544fc48f7SAkira Fujita move_extent_per_page(struct file *o_filp, struct inode *donor_inode, 756748de673SAkira Fujita pgoff_t orig_page_offset, int data_offset_in_page, 757f868a48dSAkira Fujita int block_len_in_page, int uninit, int *err) 758748de673SAkira Fujita { 759748de673SAkira Fujita struct inode *orig_inode = o_filp->f_dentry->d_inode; 760748de673SAkira Fujita struct address_space *mapping = orig_inode->i_mapping; 761748de673SAkira Fujita struct buffer_head *bh; 762748de673SAkira Fujita struct page *page = NULL; 763748de673SAkira Fujita const struct address_space_operations *a_ops = mapping->a_ops; 764748de673SAkira Fujita handle_t *handle; 765748de673SAkira Fujita ext4_lblk_t orig_blk_offset; 766748de673SAkira Fujita long long offs = orig_page_offset << PAGE_CACHE_SHIFT; 767748de673SAkira Fujita unsigned long blocksize = orig_inode->i_sb->s_blocksize; 768748de673SAkira Fujita unsigned int w_flags = 0; 769f868a48dSAkira Fujita unsigned int tmp_data_size, data_size, replaced_size; 770748de673SAkira Fujita void *fsdata; 771f868a48dSAkira Fujita int i, jblocks; 772f868a48dSAkira Fujita int err2 = 0; 773f868a48dSAkira Fujita int replaced_count = 0; 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)) { 783f868a48dSAkira Fujita *err = PTR_ERR(handle); 784f868a48dSAkira Fujita return 0; 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) { 800f868a48dSAkira Fujita replaced_count = mext_replace_branches(handle, orig_inode, 801748de673SAkira Fujita donor_inode, orig_blk_offset, 802f868a48dSAkira Fujita block_len_in_page, err); 803748de673SAkira Fujita goto out2; 804748de673SAkira Fujita } 805748de673SAkira Fujita 806748de673SAkira Fujita offs = (long long)orig_blk_offset << orig_inode->i_blkbits; 807748de673SAkira Fujita 808f868a48dSAkira Fujita /* Calculate data_size */ 809748de673SAkira Fujita if ((orig_blk_offset + block_len_in_page - 1) == 810748de673SAkira Fujita ((orig_inode->i_size - 1) >> orig_inode->i_blkbits)) { 811748de673SAkira Fujita /* Replace the last block */ 812f868a48dSAkira Fujita tmp_data_size = orig_inode->i_size & (blocksize - 1); 813748de673SAkira Fujita /* 814f868a48dSAkira Fujita * If data_size equal zero, it shows data_size is multiples of 815748de673SAkira Fujita * blocksize. So we set appropriate value. 816748de673SAkira Fujita */ 817f868a48dSAkira Fujita if (tmp_data_size == 0) 818f868a48dSAkira Fujita tmp_data_size = blocksize; 819748de673SAkira Fujita 820f868a48dSAkira Fujita data_size = tmp_data_size + 821748de673SAkira Fujita ((block_len_in_page - 1) << orig_inode->i_blkbits); 822f868a48dSAkira Fujita } else 823f868a48dSAkira Fujita data_size = block_len_in_page << orig_inode->i_blkbits; 824748de673SAkira Fujita 825f868a48dSAkira Fujita replaced_size = data_size; 826f868a48dSAkira Fujita 827f868a48dSAkira Fujita *err = a_ops->write_begin(o_filp, mapping, offs, data_size, w_flags, 828748de673SAkira Fujita &page, &fsdata); 829f868a48dSAkira Fujita if (unlikely(*err < 0)) 830748de673SAkira Fujita goto out; 831748de673SAkira Fujita 832748de673SAkira Fujita if (!PageUptodate(page)) { 833748de673SAkira Fujita mapping->a_ops->readpage(o_filp, page); 834748de673SAkira Fujita lock_page(page); 835748de673SAkira Fujita } 836748de673SAkira Fujita 837748de673SAkira Fujita /* 838748de673SAkira Fujita * try_to_release_page() doesn't call releasepage in writeback mode. 839748de673SAkira Fujita * We should care about the order of writing to the same file 840748de673SAkira Fujita * by multiple move extent processes. 841748de673SAkira Fujita * It needs to call wait_on_page_writeback() to wait for the 842748de673SAkira Fujita * writeback of the page. 843748de673SAkira Fujita */ 844748de673SAkira Fujita wait_on_page_writeback(page); 845748de673SAkira Fujita 846748de673SAkira Fujita /* Release old bh and drop refs */ 847748de673SAkira Fujita try_to_release_page(page, 0); 848748de673SAkira Fujita 849f868a48dSAkira Fujita replaced_count = mext_replace_branches(handle, orig_inode, donor_inode, 850f868a48dSAkira Fujita orig_blk_offset, block_len_in_page, 851f868a48dSAkira Fujita &err2); 852f868a48dSAkira Fujita if (err2) { 853f868a48dSAkira Fujita if (replaced_count) { 854f868a48dSAkira Fujita block_len_in_page = replaced_count; 855f868a48dSAkira Fujita replaced_size = 856f868a48dSAkira Fujita block_len_in_page << orig_inode->i_blkbits; 857ac48b0a1SAkira Fujita } else 858748de673SAkira Fujita goto out; 859f868a48dSAkira Fujita } 860fc04cb49SAkira Fujita 861748de673SAkira Fujita if (!page_has_buffers(page)) 862748de673SAkira Fujita create_empty_buffers(page, 1 << orig_inode->i_blkbits, 0); 863748de673SAkira Fujita 864748de673SAkira Fujita bh = page_buffers(page); 865748de673SAkira Fujita for (i = 0; i < data_offset_in_page; i++) 866748de673SAkira Fujita bh = bh->b_this_page; 867748de673SAkira Fujita 868748de673SAkira Fujita for (i = 0; i < block_len_in_page; i++) { 869f868a48dSAkira Fujita *err = ext4_get_block(orig_inode, 870748de673SAkira Fujita (sector_t)(orig_blk_offset + i), bh, 0); 871f868a48dSAkira Fujita if (*err < 0) 872748de673SAkira Fujita goto out; 873748de673SAkira Fujita 874748de673SAkira Fujita if (bh->b_this_page != NULL) 875748de673SAkira Fujita bh = bh->b_this_page; 876748de673SAkira Fujita } 877748de673SAkira Fujita 878f868a48dSAkira Fujita *err = a_ops->write_end(o_filp, mapping, offs, data_size, replaced_size, 879748de673SAkira Fujita page, fsdata); 880748de673SAkira Fujita page = NULL; 881748de673SAkira Fujita 882748de673SAkira Fujita out: 883748de673SAkira Fujita if (unlikely(page)) { 884748de673SAkira Fujita if (PageLocked(page)) 885748de673SAkira Fujita unlock_page(page); 886748de673SAkira Fujita page_cache_release(page); 88791cc219aSPeng Tao ext4_journal_stop(handle); 888748de673SAkira Fujita } 889748de673SAkira Fujita out2: 890748de673SAkira Fujita ext4_journal_stop(handle); 891748de673SAkira Fujita 892f868a48dSAkira Fujita if (err2) 893f868a48dSAkira Fujita *err = err2; 894f868a48dSAkira Fujita 895f868a48dSAkira Fujita return replaced_count; 896748de673SAkira Fujita } 897748de673SAkira Fujita 898748de673SAkira Fujita /** 899c437b273SAkira Fujita * mext_check_arguments - Check whether move extent can be done 900748de673SAkira Fujita * 901748de673SAkira Fujita * @orig_inode: original inode 902748de673SAkira Fujita * @donor_inode: donor inode 903748de673SAkira Fujita * @orig_start: logical start offset in block for orig 904748de673SAkira Fujita * @donor_start: logical start offset in block for donor 905748de673SAkira Fujita * @len: the number of blocks to be moved 906748de673SAkira Fujita * 907748de673SAkira Fujita * Check the arguments of ext4_move_extents() whether the files can be 908748de673SAkira Fujita * exchanged with each other. 909748de673SAkira Fujita * Return 0 on success, or a negative error value on failure. 910748de673SAkira Fujita */ 911748de673SAkira Fujita static int 912748de673SAkira Fujita mext_check_arguments(struct inode *orig_inode, 913748de673SAkira Fujita struct inode *donor_inode, __u64 orig_start, 914446aaa6eSKazuya Mio __u64 donor_start, __u64 *len) 915748de673SAkira Fujita { 91670d5d3dcSAkira Fujita ext4_lblk_t orig_blocks, donor_blocks; 91770d5d3dcSAkira Fujita unsigned int blkbits = orig_inode->i_blkbits; 91870d5d3dcSAkira Fujita unsigned int blocksize = 1 << blkbits; 91970d5d3dcSAkira Fujita 9204a58579bSAkira Fujita if (donor_inode->i_mode & (S_ISUID|S_ISGID)) { 9214a58579bSAkira Fujita ext4_debug("ext4 move extent: suid or sgid is set" 9224a58579bSAkira Fujita " to donor file [ino:orig %lu, donor %lu]\n", 9234a58579bSAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 9244a58579bSAkira Fujita return -EINVAL; 9254a58579bSAkira Fujita } 9264a58579bSAkira Fujita 9271f5a81e4STheodore Ts'o if (IS_IMMUTABLE(donor_inode) || IS_APPEND(donor_inode)) 9281f5a81e4STheodore Ts'o return -EPERM; 9291f5a81e4STheodore Ts'o 930748de673SAkira Fujita /* Ext4 move extent does not support swapfile */ 931748de673SAkira Fujita if (IS_SWAPFILE(orig_inode) || IS_SWAPFILE(donor_inode)) { 932748de673SAkira Fujita ext4_debug("ext4 move extent: The argument files should " 933748de673SAkira Fujita "not be swapfile [ino:orig %lu, donor %lu]\n", 934748de673SAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 935748de673SAkira Fujita return -EINVAL; 936748de673SAkira Fujita } 937748de673SAkira Fujita 938748de673SAkira Fujita /* Ext4 move extent supports only extent based file */ 93912e9b892SDmitry Monakhov if (!(ext4_test_inode_flag(orig_inode, EXT4_INODE_EXTENTS))) { 940748de673SAkira Fujita ext4_debug("ext4 move extent: orig file is not extents " 941748de673SAkira Fujita "based file [ino:orig %lu]\n", orig_inode->i_ino); 942748de673SAkira Fujita return -EOPNOTSUPP; 94312e9b892SDmitry Monakhov } else if (!(ext4_test_inode_flag(donor_inode, EXT4_INODE_EXTENTS))) { 944748de673SAkira Fujita ext4_debug("ext4 move extent: donor file is not extents " 945748de673SAkira Fujita "based file [ino:donor %lu]\n", donor_inode->i_ino); 946748de673SAkira Fujita return -EOPNOTSUPP; 947748de673SAkira Fujita } 948748de673SAkira Fujita 949748de673SAkira Fujita if ((!orig_inode->i_size) || (!donor_inode->i_size)) { 950748de673SAkira Fujita ext4_debug("ext4 move extent: File size is 0 byte\n"); 951748de673SAkira Fujita return -EINVAL; 952748de673SAkira Fujita } 953748de673SAkira Fujita 954748de673SAkira Fujita /* Start offset should be same */ 955748de673SAkira Fujita if (orig_start != donor_start) { 956748de673SAkira Fujita ext4_debug("ext4 move extent: orig and donor's start " 957748de673SAkira Fujita "offset are not same [ino:orig %lu, donor %lu]\n", 958748de673SAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 959748de673SAkira Fujita return -EINVAL; 960748de673SAkira Fujita } 961748de673SAkira Fujita 962f17722f9SLukas Czerner if ((orig_start >= EXT_MAX_BLOCKS) || 963f17722f9SLukas Czerner (donor_start >= EXT_MAX_BLOCKS) || 964f17722f9SLukas Czerner (*len > EXT_MAX_BLOCKS) || 965f17722f9SLukas Czerner (orig_start + *len >= EXT_MAX_BLOCKS)) { 9660a80e986SEric Sandeen ext4_debug("ext4 move extent: Can't handle over [%u] blocks " 967f17722f9SLukas Czerner "[ino:orig %lu, donor %lu]\n", EXT_MAX_BLOCKS, 968748de673SAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 969748de673SAkira Fujita return -EINVAL; 970748de673SAkira Fujita } 971748de673SAkira Fujita 972748de673SAkira Fujita if (orig_inode->i_size > donor_inode->i_size) { 97370d5d3dcSAkira Fujita donor_blocks = (donor_inode->i_size + blocksize - 1) >> blkbits; 97470d5d3dcSAkira Fujita /* TODO: eliminate this artificial restriction */ 97570d5d3dcSAkira Fujita if (orig_start >= donor_blocks) { 976748de673SAkira Fujita ext4_debug("ext4 move extent: orig start offset " 97770d5d3dcSAkira Fujita "[%llu] should be less than donor file blocks " 97870d5d3dcSAkira Fujita "[%u] [ino:orig %lu, donor %lu]\n", 97970d5d3dcSAkira Fujita orig_start, donor_blocks, 980748de673SAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 981748de673SAkira Fujita return -EINVAL; 982748de673SAkira Fujita } 983748de673SAkira Fujita 98470d5d3dcSAkira Fujita /* TODO: eliminate this artificial restriction */ 98570d5d3dcSAkira Fujita if (orig_start + *len > donor_blocks) { 986748de673SAkira Fujita ext4_debug("ext4 move extent: End offset [%llu] should " 98770d5d3dcSAkira Fujita "be less than donor file blocks [%u]." 98870d5d3dcSAkira Fujita "So adjust length from %llu to %llu " 989748de673SAkira Fujita "[ino:orig %lu, donor %lu]\n", 99070d5d3dcSAkira Fujita orig_start + *len, donor_blocks, 99170d5d3dcSAkira Fujita *len, donor_blocks - orig_start, 992748de673SAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 99370d5d3dcSAkira Fujita *len = donor_blocks - orig_start; 994748de673SAkira Fujita } 995748de673SAkira Fujita } else { 99670d5d3dcSAkira Fujita orig_blocks = (orig_inode->i_size + blocksize - 1) >> blkbits; 99770d5d3dcSAkira Fujita if (orig_start >= orig_blocks) { 998748de673SAkira Fujita ext4_debug("ext4 move extent: start offset [%llu] " 99970d5d3dcSAkira Fujita "should be less than original file blocks " 100070d5d3dcSAkira Fujita "[%u] [ino:orig %lu, donor %lu]\n", 100170d5d3dcSAkira Fujita orig_start, orig_blocks, 1002748de673SAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 1003748de673SAkira Fujita return -EINVAL; 1004748de673SAkira Fujita } 1005748de673SAkira Fujita 100670d5d3dcSAkira Fujita if (orig_start + *len > orig_blocks) { 1007748de673SAkira Fujita ext4_debug("ext4 move extent: Adjust length " 100870d5d3dcSAkira Fujita "from %llu to %llu. Because it should be " 100970d5d3dcSAkira Fujita "less than original file blocks " 1010748de673SAkira Fujita "[ino:orig %lu, donor %lu]\n", 101170d5d3dcSAkira Fujita *len, orig_blocks - orig_start, 1012748de673SAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 101370d5d3dcSAkira Fujita *len = orig_blocks - orig_start; 1014748de673SAkira Fujita } 1015748de673SAkira Fujita } 1016748de673SAkira Fujita 1017748de673SAkira Fujita if (!*len) { 101892c28159SAkira Fujita ext4_debug("ext4 move extent: len should not be 0 " 1019748de673SAkira Fujita "[ino:orig %lu, donor %lu]\n", orig_inode->i_ino, 1020748de673SAkira Fujita donor_inode->i_ino); 1021748de673SAkira Fujita return -EINVAL; 1022748de673SAkira Fujita } 1023748de673SAkira Fujita 1024748de673SAkira Fujita return 0; 1025748de673SAkira Fujita } 1026748de673SAkira Fujita 1027748de673SAkira Fujita /** 1028748de673SAkira Fujita * mext_inode_double_lock - Lock i_mutex on both @inode1 and @inode2 1029748de673SAkira Fujita * 1030748de673SAkira Fujita * @inode1: the inode structure 1031748de673SAkira Fujita * @inode2: the inode structure 1032748de673SAkira Fujita * 103303bd8b9bSDmitry Monakhov * Lock two inodes' i_mutex 1034748de673SAkira Fujita */ 103503bd8b9bSDmitry Monakhov static void 1036748de673SAkira Fujita mext_inode_double_lock(struct inode *inode1, struct inode *inode2) 1037748de673SAkira Fujita { 103803bd8b9bSDmitry Monakhov BUG_ON(inode1 == inode2); 103903bd8b9bSDmitry Monakhov if (inode1 < inode2) { 1040748de673SAkira Fujita mutex_lock_nested(&inode1->i_mutex, I_MUTEX_PARENT); 1041748de673SAkira Fujita mutex_lock_nested(&inode2->i_mutex, I_MUTEX_CHILD); 1042748de673SAkira Fujita } else { 1043748de673SAkira Fujita mutex_lock_nested(&inode2->i_mutex, I_MUTEX_PARENT); 1044748de673SAkira Fujita mutex_lock_nested(&inode1->i_mutex, I_MUTEX_CHILD); 1045748de673SAkira Fujita } 1046748de673SAkira Fujita } 1047748de673SAkira Fujita 1048748de673SAkira Fujita /** 1049748de673SAkira Fujita * mext_inode_double_unlock - Release i_mutex on both @inode1 and @inode2 1050748de673SAkira Fujita * 1051748de673SAkira Fujita * @inode1: the inode that is released first 1052748de673SAkira Fujita * @inode2: the inode that is released second 1053748de673SAkira Fujita * 1054748de673SAkira Fujita */ 1055748de673SAkira Fujita 105603bd8b9bSDmitry Monakhov static void 1057748de673SAkira Fujita mext_inode_double_unlock(struct inode *inode1, struct inode *inode2) 1058748de673SAkira Fujita { 1059748de673SAkira Fujita mutex_unlock(&inode1->i_mutex); 1060748de673SAkira Fujita mutex_unlock(&inode2->i_mutex); 1061748de673SAkira Fujita } 1062748de673SAkira Fujita 1063748de673SAkira Fujita /** 1064748de673SAkira Fujita * ext4_move_extents - Exchange the specified range of a file 1065748de673SAkira Fujita * 1066748de673SAkira Fujita * @o_filp: file structure of the original file 1067748de673SAkira Fujita * @d_filp: file structure of the donor file 1068748de673SAkira Fujita * @orig_start: start offset in block for orig 1069748de673SAkira Fujita * @donor_start: start offset in block for donor 1070748de673SAkira Fujita * @len: the number of blocks to be moved 1071748de673SAkira Fujita * @moved_len: moved block length 1072748de673SAkira Fujita * 1073748de673SAkira Fujita * This function returns 0 and moved block length is set in moved_len 1074748de673SAkira Fujita * if succeed, otherwise returns error value. 1075748de673SAkira Fujita * 1076748de673SAkira Fujita * Note: ext4_move_extents() proceeds the following order. 1077748de673SAkira Fujita * 1:ext4_move_extents() calculates the last block number of moving extent 1078748de673SAkira Fujita * function by the start block number (orig_start) and the number of blocks 1079748de673SAkira Fujita * to be moved (len) specified as arguments. 1080748de673SAkira Fujita * If the {orig, donor}_start points a hole, the extent's start offset 1081748de673SAkira Fujita * pointed by ext_cur (current extent), holecheck_path, orig_path are set 1082748de673SAkira Fujita * after hole behind. 1083748de673SAkira Fujita * 2:Continue step 3 to step 5, until the holecheck_path points to last_extent 1084748de673SAkira Fujita * or the ext_cur exceeds the block_end which is last logical block number. 1085748de673SAkira Fujita * 3:To get the length of continues area, call mext_next_extent() 1086748de673SAkira Fujita * specified with the ext_cur (initial value is holecheck_path) re-cursive, 1087748de673SAkira Fujita * until find un-continuous extent, the start logical block number exceeds 1088748de673SAkira Fujita * the block_end or the extent points to the last extent. 1089748de673SAkira Fujita * 4:Exchange the original inode data with donor inode data 1090748de673SAkira Fujita * from orig_page_offset to seq_end_page. 1091748de673SAkira Fujita * The start indexes of data are specified as arguments. 1092748de673SAkira Fujita * That of the original inode is orig_page_offset, 1093748de673SAkira Fujita * and the donor inode is also orig_page_offset 1094748de673SAkira Fujita * (To easily handle blocksize != pagesize case, the offset for the 1095748de673SAkira Fujita * donor inode is block unit). 1096748de673SAkira Fujita * 5:Update holecheck_path and orig_path to points a next proceeding extent, 1097748de673SAkira Fujita * then returns to step 2. 1098748de673SAkira Fujita * 6:Release holecheck_path, orig_path and set the len to moved_len 1099748de673SAkira Fujita * which shows the number of moved blocks. 1100748de673SAkira Fujita * The moved_len is useful for the command to calculate the file offset 1101748de673SAkira Fujita * for starting next move extent ioctl. 1102748de673SAkira Fujita * 7:Return 0 on success, or a negative error value on failure. 1103748de673SAkira Fujita */ 1104748de673SAkira Fujita int 1105748de673SAkira Fujita ext4_move_extents(struct file *o_filp, struct file *d_filp, 1106748de673SAkira Fujita __u64 orig_start, __u64 donor_start, __u64 len, 1107748de673SAkira Fujita __u64 *moved_len) 1108748de673SAkira Fujita { 1109748de673SAkira Fujita struct inode *orig_inode = o_filp->f_dentry->d_inode; 1110748de673SAkira Fujita struct inode *donor_inode = d_filp->f_dentry->d_inode; 1111748de673SAkira Fujita struct ext4_ext_path *orig_path = NULL, *holecheck_path = NULL; 1112748de673SAkira Fujita struct ext4_extent *ext_prev, *ext_cur, *ext_dummy; 1113748de673SAkira Fujita ext4_lblk_t block_start = orig_start; 1114748de673SAkira Fujita ext4_lblk_t block_end, seq_start, add_blocks, file_end, seq_blocks = 0; 1115748de673SAkira Fujita ext4_lblk_t rest_blocks; 1116748de673SAkira Fujita pgoff_t orig_page_offset = 0, seq_end_page; 111703bd8b9bSDmitry Monakhov int ret, depth, last_extent = 0; 1118748de673SAkira Fujita int blocks_per_page = PAGE_CACHE_SIZE >> orig_inode->i_blkbits; 1119748de673SAkira Fujita int data_offset_in_page; 1120748de673SAkira Fujita int block_len_in_page; 1121748de673SAkira Fujita int uninit; 1122748de673SAkira Fujita 112303bd8b9bSDmitry Monakhov if (orig_inode->i_sb != donor_inode->i_sb) { 112403bd8b9bSDmitry Monakhov ext4_debug("ext4 move extent: The argument files " 112503bd8b9bSDmitry Monakhov "should be in same FS [ino:orig %lu, donor %lu]\n", 112603bd8b9bSDmitry Monakhov orig_inode->i_ino, donor_inode->i_ino); 112703bd8b9bSDmitry Monakhov return -EINVAL; 112803bd8b9bSDmitry Monakhov } 112903bd8b9bSDmitry Monakhov 113003bd8b9bSDmitry Monakhov /* orig and donor should be different inodes */ 113103bd8b9bSDmitry Monakhov if (orig_inode == donor_inode) { 1132f3ce8064STheodore Ts'o ext4_debug("ext4 move extent: The argument files should not " 113303bd8b9bSDmitry Monakhov "be same inode [ino:orig %lu, donor %lu]\n", 1134f3ce8064STheodore Ts'o orig_inode->i_ino, donor_inode->i_ino); 1135f3ce8064STheodore Ts'o return -EINVAL; 1136f3ce8064STheodore Ts'o } 1137f3ce8064STheodore Ts'o 11387247c0caSAkira Fujita /* Regular file check */ 11397247c0caSAkira Fujita if (!S_ISREG(orig_inode->i_mode) || !S_ISREG(donor_inode->i_mode)) { 11407247c0caSAkira Fujita ext4_debug("ext4 move extent: The argument files should be " 11417247c0caSAkira Fujita "regular file [ino:orig %lu, donor %lu]\n", 11427247c0caSAkira Fujita orig_inode->i_ino, donor_inode->i_ino); 11437247c0caSAkira Fujita return -EINVAL; 11447247c0caSAkira Fujita } 11457247c0caSAkira Fujita 1146fc04cb49SAkira Fujita /* Protect orig and donor inodes against a truncate */ 114703bd8b9bSDmitry Monakhov mext_inode_double_lock(orig_inode, donor_inode); 1148748de673SAkira Fujita 1149fc04cb49SAkira Fujita /* Protect extent tree against block allocations via delalloc */ 1150fc04cb49SAkira Fujita double_down_write_data_sem(orig_inode, donor_inode); 1151748de673SAkira Fujita /* Check the filesystem environment whether move_extent can be done */ 115203bd8b9bSDmitry Monakhov ret = mext_check_arguments(orig_inode, donor_inode, orig_start, 1153446aaa6eSKazuya Mio donor_start, &len); 115403bd8b9bSDmitry Monakhov if (ret) 1155347fa6f1SAkira Fujita goto out; 1156748de673SAkira Fujita 1157748de673SAkira Fujita file_end = (i_size_read(orig_inode) - 1) >> orig_inode->i_blkbits; 1158748de673SAkira Fujita block_end = block_start + len - 1; 1159748de673SAkira Fujita if (file_end < block_end) 1160748de673SAkira Fujita len -= block_end - file_end; 1161748de673SAkira Fujita 116203bd8b9bSDmitry Monakhov ret = get_ext_path(orig_inode, block_start, &orig_path); 116303bd8b9bSDmitry Monakhov if (ret) 1164347fa6f1SAkira Fujita goto out; 1165748de673SAkira Fujita 1166748de673SAkira Fujita /* Get path structure to check the hole */ 116703bd8b9bSDmitry Monakhov ret = get_ext_path(orig_inode, block_start, &holecheck_path); 116803bd8b9bSDmitry Monakhov if (ret) 1169748de673SAkira Fujita goto out; 1170748de673SAkira Fujita 1171748de673SAkira Fujita depth = ext_depth(orig_inode); 1172748de673SAkira Fujita ext_cur = holecheck_path[depth].p_ext; 1173748de673SAkira Fujita 1174748de673SAkira Fujita /* 1175c40ce3c9SAkira Fujita * Get proper starting location of block replacement if block_start was 1176c40ce3c9SAkira Fujita * within the hole. 1177748de673SAkira Fujita */ 1178748de673SAkira Fujita if (le32_to_cpu(ext_cur->ee_block) + 1179748de673SAkira Fujita ext4_ext_get_actual_len(ext_cur) - 1 < block_start) { 1180c40ce3c9SAkira Fujita /* 1181c40ce3c9SAkira Fujita * The hole exists between extents or the tail of 1182c40ce3c9SAkira Fujita * original file. 1183c40ce3c9SAkira Fujita */ 1184748de673SAkira Fujita last_extent = mext_next_extent(orig_inode, 1185748de673SAkira Fujita holecheck_path, &ext_cur); 1186748de673SAkira Fujita if (last_extent < 0) { 118703bd8b9bSDmitry Monakhov ret = last_extent; 1188748de673SAkira Fujita goto out; 1189748de673SAkira Fujita } 1190748de673SAkira Fujita last_extent = mext_next_extent(orig_inode, orig_path, 1191748de673SAkira Fujita &ext_dummy); 1192748de673SAkira Fujita if (last_extent < 0) { 119303bd8b9bSDmitry Monakhov ret = last_extent; 1194748de673SAkira Fujita goto out; 1195748de673SAkira Fujita } 1196c40ce3c9SAkira Fujita seq_start = le32_to_cpu(ext_cur->ee_block); 1197c40ce3c9SAkira Fujita } else if (le32_to_cpu(ext_cur->ee_block) > block_start) 1198c40ce3c9SAkira Fujita /* The hole exists at the beginning of original file. */ 1199c40ce3c9SAkira Fujita seq_start = le32_to_cpu(ext_cur->ee_block); 1200c40ce3c9SAkira Fujita else 1201748de673SAkira Fujita seq_start = block_start; 1202748de673SAkira Fujita 1203748de673SAkira Fujita /* No blocks within the specified range. */ 1204748de673SAkira Fujita if (le32_to_cpu(ext_cur->ee_block) > block_end) { 1205748de673SAkira Fujita ext4_debug("ext4 move extent: The specified range of file " 1206748de673SAkira Fujita "may be the hole\n"); 120703bd8b9bSDmitry Monakhov ret = -EINVAL; 1208748de673SAkira Fujita goto out; 1209748de673SAkira Fujita } 1210748de673SAkira Fujita 1211748de673SAkira Fujita /* Adjust start blocks */ 1212748de673SAkira Fujita add_blocks = min(le32_to_cpu(ext_cur->ee_block) + 1213748de673SAkira Fujita ext4_ext_get_actual_len(ext_cur), block_end + 1) - 1214748de673SAkira Fujita max(le32_to_cpu(ext_cur->ee_block), block_start); 1215748de673SAkira Fujita 1216748de673SAkira Fujita while (!last_extent && le32_to_cpu(ext_cur->ee_block) <= block_end) { 1217748de673SAkira Fujita seq_blocks += add_blocks; 1218748de673SAkira Fujita 1219748de673SAkira Fujita /* Adjust tail blocks */ 1220748de673SAkira Fujita if (seq_start + seq_blocks - 1 > block_end) 1221748de673SAkira Fujita seq_blocks = block_end - seq_start + 1; 1222748de673SAkira Fujita 1223748de673SAkira Fujita ext_prev = ext_cur; 1224748de673SAkira Fujita last_extent = mext_next_extent(orig_inode, holecheck_path, 1225748de673SAkira Fujita &ext_cur); 1226748de673SAkira Fujita if (last_extent < 0) { 122703bd8b9bSDmitry Monakhov ret = last_extent; 1228748de673SAkira Fujita break; 1229748de673SAkira Fujita } 1230748de673SAkira Fujita add_blocks = ext4_ext_get_actual_len(ext_cur); 1231748de673SAkira Fujita 1232748de673SAkira Fujita /* 1233748de673SAkira Fujita * Extend the length of contiguous block (seq_blocks) 1234748de673SAkira Fujita * if extents are contiguous. 1235748de673SAkira Fujita */ 1236748de673SAkira Fujita if (ext4_can_extents_be_merged(orig_inode, 1237748de673SAkira Fujita ext_prev, ext_cur) && 1238748de673SAkira Fujita block_end >= le32_to_cpu(ext_cur->ee_block) && 1239748de673SAkira Fujita !last_extent) 1240748de673SAkira Fujita continue; 1241748de673SAkira Fujita 1242748de673SAkira Fujita /* Is original extent is uninitialized */ 1243748de673SAkira Fujita uninit = ext4_ext_is_uninitialized(ext_prev); 1244748de673SAkira Fujita 1245748de673SAkira Fujita data_offset_in_page = seq_start % blocks_per_page; 1246748de673SAkira Fujita 1247748de673SAkira Fujita /* 1248748de673SAkira Fujita * Calculate data blocks count that should be swapped 1249748de673SAkira Fujita * at the first page. 1250748de673SAkira Fujita */ 1251748de673SAkira Fujita if (data_offset_in_page + seq_blocks > blocks_per_page) { 1252748de673SAkira Fujita /* Swapped blocks are across pages */ 1253748de673SAkira Fujita block_len_in_page = 1254748de673SAkira Fujita blocks_per_page - data_offset_in_page; 1255748de673SAkira Fujita } else { 1256748de673SAkira Fujita /* Swapped blocks are in a page */ 1257748de673SAkira Fujita block_len_in_page = seq_blocks; 1258748de673SAkira Fujita } 1259748de673SAkira Fujita 1260748de673SAkira Fujita orig_page_offset = seq_start >> 1261748de673SAkira Fujita (PAGE_CACHE_SHIFT - orig_inode->i_blkbits); 1262748de673SAkira Fujita seq_end_page = (seq_start + seq_blocks - 1) >> 1263748de673SAkira Fujita (PAGE_CACHE_SHIFT - orig_inode->i_blkbits); 1264748de673SAkira Fujita seq_start = le32_to_cpu(ext_cur->ee_block); 1265748de673SAkira Fujita rest_blocks = seq_blocks; 1266748de673SAkira Fujita 1267fc04cb49SAkira Fujita /* 1268fc04cb49SAkira Fujita * Up semaphore to avoid following problems: 1269fc04cb49SAkira Fujita * a. transaction deadlock among ext4_journal_start, 1270fc04cb49SAkira Fujita * ->write_begin via pagefault, and jbd2_journal_commit 1271fc04cb49SAkira Fujita * b. racing with ->readpage, ->write_begin, and ext4_get_block 1272fc04cb49SAkira Fujita * in move_extent_per_page 1273fc04cb49SAkira Fujita */ 1274fc04cb49SAkira Fujita double_up_write_data_sem(orig_inode, donor_inode); 1275748de673SAkira Fujita 1276748de673SAkira Fujita while (orig_page_offset <= seq_end_page) { 1277748de673SAkira Fujita 1278748de673SAkira Fujita /* Swap original branches with new branches */ 1279f868a48dSAkira Fujita block_len_in_page = move_extent_per_page( 1280f868a48dSAkira Fujita o_filp, donor_inode, 1281748de673SAkira Fujita orig_page_offset, 1282748de673SAkira Fujita data_offset_in_page, 1283f868a48dSAkira Fujita block_len_in_page, uninit, 128403bd8b9bSDmitry Monakhov &ret); 1285f868a48dSAkira Fujita 1286748de673SAkira Fujita /* Count how many blocks we have exchanged */ 1287748de673SAkira Fujita *moved_len += block_len_in_page; 128803bd8b9bSDmitry Monakhov if (ret < 0) 1289fc04cb49SAkira Fujita break; 12902147b1a6SAkira Fujita if (*moved_len > len) { 129124676da4STheodore Ts'o EXT4_ERROR_INODE(orig_inode, 12922147b1a6SAkira Fujita "We replaced blocks too much! " 12932147b1a6SAkira Fujita "sum of replaced: %llu requested: %llu", 12942147b1a6SAkira Fujita *moved_len, len); 129503bd8b9bSDmitry Monakhov ret = -EIO; 1296fc04cb49SAkira Fujita break; 12972147b1a6SAkira Fujita } 1298748de673SAkira Fujita 1299f868a48dSAkira Fujita orig_page_offset++; 1300748de673SAkira Fujita data_offset_in_page = 0; 1301748de673SAkira Fujita rest_blocks -= block_len_in_page; 1302748de673SAkira Fujita if (rest_blocks > blocks_per_page) 1303748de673SAkira Fujita block_len_in_page = blocks_per_page; 1304748de673SAkira Fujita else 1305748de673SAkira Fujita block_len_in_page = rest_blocks; 1306748de673SAkira Fujita } 1307748de673SAkira Fujita 1308fc04cb49SAkira Fujita double_down_write_data_sem(orig_inode, donor_inode); 130903bd8b9bSDmitry Monakhov if (ret < 0) 1310fc04cb49SAkira Fujita break; 1311fc04cb49SAkira Fujita 1312748de673SAkira Fujita /* Decrease buffer counter */ 1313748de673SAkira Fujita if (holecheck_path) 1314748de673SAkira Fujita ext4_ext_drop_refs(holecheck_path); 131503bd8b9bSDmitry Monakhov ret = get_ext_path(orig_inode, seq_start, &holecheck_path); 131603bd8b9bSDmitry Monakhov if (ret) 1317748de673SAkira Fujita break; 1318748de673SAkira Fujita depth = holecheck_path->p_depth; 1319748de673SAkira Fujita 1320748de673SAkira Fujita /* Decrease buffer counter */ 1321748de673SAkira Fujita if (orig_path) 1322748de673SAkira Fujita ext4_ext_drop_refs(orig_path); 132303bd8b9bSDmitry Monakhov ret = get_ext_path(orig_inode, seq_start, &orig_path); 132403bd8b9bSDmitry Monakhov if (ret) 1325748de673SAkira Fujita break; 1326748de673SAkira Fujita 1327748de673SAkira Fujita ext_cur = holecheck_path[depth].p_ext; 1328748de673SAkira Fujita add_blocks = ext4_ext_get_actual_len(ext_cur); 1329748de673SAkira Fujita seq_blocks = 0; 1330748de673SAkira Fujita 1331748de673SAkira Fujita } 1332748de673SAkira Fujita out: 133394d7c16cSAkira Fujita if (*moved_len) { 133494d7c16cSAkira Fujita ext4_discard_preallocations(orig_inode); 133594d7c16cSAkira Fujita ext4_discard_preallocations(donor_inode); 133694d7c16cSAkira Fujita } 133794d7c16cSAkira Fujita 1338748de673SAkira Fujita if (orig_path) { 1339748de673SAkira Fujita ext4_ext_drop_refs(orig_path); 1340748de673SAkira Fujita kfree(orig_path); 1341748de673SAkira Fujita } 1342748de673SAkira Fujita if (holecheck_path) { 1343748de673SAkira Fujita ext4_ext_drop_refs(holecheck_path); 1344748de673SAkira Fujita kfree(holecheck_path); 1345748de673SAkira Fujita } 1346fc04cb49SAkira Fujita double_up_write_data_sem(orig_inode, donor_inode); 134703bd8b9bSDmitry Monakhov mext_inode_double_unlock(orig_inode, donor_inode); 1348748de673SAkira Fujita 134903bd8b9bSDmitry Monakhov return ret; 1350748de673SAkira Fujita } 1351