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1// SPDX-License-Identifier: GPL-2.02/*3 * Interface between ext4 and JBD4 */5 6#include "ext4_jbd2.h"7 8#include <trace/events/ext4.h>9 10int ext4_inode_journal_mode(struct inode *inode)11{12 if (EXT4_JOURNAL(inode) == NULL)13 return EXT4_INODE_WRITEBACK_DATA_MODE; /* writeback */14 /* We do not support data journalling with delayed allocation */15 if (!S_ISREG(inode->i_mode) ||16 ext4_test_inode_flag(inode, EXT4_INODE_EA_INODE) ||17 test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ||18 (ext4_test_inode_flag(inode, EXT4_INODE_JOURNAL_DATA) &&19 !test_opt(inode->i_sb, DELALLOC))) {20 /* We do not support data journalling for encrypted data */21 if (S_ISREG(inode->i_mode) && IS_ENCRYPTED(inode))22 return EXT4_INODE_ORDERED_DATA_MODE; /* ordered */23 return EXT4_INODE_JOURNAL_DATA_MODE; /* journal data */24 }25 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)26 return EXT4_INODE_ORDERED_DATA_MODE; /* ordered */27 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)28 return EXT4_INODE_WRITEBACK_DATA_MODE; /* writeback */29 BUG();30}31 32/* Just increment the non-pointer handle value */33static handle_t *ext4_get_nojournal(void)34{35 handle_t *handle = current->journal_info;36 unsigned long ref_cnt = (unsigned long)handle;37 38 BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);39 40 ref_cnt++;41 handle = (handle_t *)ref_cnt;42 43 current->journal_info = handle;44 return handle;45}46 47 48/* Decrement the non-pointer handle value */49static void ext4_put_nojournal(handle_t *handle)50{51 unsigned long ref_cnt = (unsigned long)handle;52 53 BUG_ON(ref_cnt == 0);54 55 ref_cnt--;56 handle = (handle_t *)ref_cnt;57 58 current->journal_info = handle;59}60 61/*62 * Wrappers for jbd2_journal_start/end.63 */64static int ext4_journal_check_start(struct super_block *sb)65{66 journal_t *journal;67 68 might_sleep();69 70 if (unlikely(ext4_forced_shutdown(sb)))71 return -EIO;72 73 if (WARN_ON_ONCE(sb_rdonly(sb)))74 return -EROFS;75 76 WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE);77 journal = EXT4_SB(sb)->s_journal;78 /*79 * Special case here: if the journal has aborted behind our80 * backs (eg. EIO in the commit thread), then we still need to81 * take the FS itself readonly cleanly.82 */83 if (journal && is_journal_aborted(journal)) {84 ext4_abort(sb, -journal->j_errno, "Detected aborted journal");85 return -EROFS;86 }87 return 0;88}89 90handle_t *__ext4_journal_start_sb(struct inode *inode,91 struct super_block *sb, unsigned int line,92 int type, int blocks, int rsv_blocks,93 int revoke_creds)94{95 journal_t *journal;96 int err;97 if (inode)98 trace_ext4_journal_start_inode(inode, blocks, rsv_blocks,99 revoke_creds, type,100 _RET_IP_);101 else102 trace_ext4_journal_start_sb(sb, blocks, rsv_blocks,103 revoke_creds, type,104 _RET_IP_);105 err = ext4_journal_check_start(sb);106 if (err < 0)107 return ERR_PTR(err);108 109 journal = EXT4_SB(sb)->s_journal;110 if (!journal || (EXT4_SB(sb)->s_mount_state & EXT4_FC_REPLAY))111 return ext4_get_nojournal();112 return jbd2__journal_start(journal, blocks, rsv_blocks, revoke_creds,113 GFP_NOFS, type, line);114}115 116int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)117{118 struct super_block *sb;119 int err;120 int rc;121 122 if (!ext4_handle_valid(handle)) {123 ext4_put_nojournal(handle);124 return 0;125 }126 127 err = handle->h_err;128 if (!handle->h_transaction) {129 rc = jbd2_journal_stop(handle);130 return err ? err : rc;131 }132 133 sb = handle->h_transaction->t_journal->j_private;134 rc = jbd2_journal_stop(handle);135 136 if (!err)137 err = rc;138 if (err)139 __ext4_std_error(sb, where, line, err);140 return err;141}142 143handle_t *__ext4_journal_start_reserved(handle_t *handle, unsigned int line,144 int type)145{146 struct super_block *sb;147 int err;148 149 if (!ext4_handle_valid(handle))150 return ext4_get_nojournal();151 152 sb = handle->h_journal->j_private;153 trace_ext4_journal_start_reserved(sb,154 jbd2_handle_buffer_credits(handle), _RET_IP_);155 err = ext4_journal_check_start(sb);156 if (err < 0) {157 jbd2_journal_free_reserved(handle);158 return ERR_PTR(err);159 }160 161 err = jbd2_journal_start_reserved(handle, type, line);162 if (err < 0)163 return ERR_PTR(err);164 return handle;165}166 167int __ext4_journal_ensure_credits(handle_t *handle, int check_cred,168 int extend_cred, int revoke_cred)169{170 if (!ext4_handle_valid(handle))171 return 0;172 if (is_handle_aborted(handle))173 return -EROFS;174 if (jbd2_handle_buffer_credits(handle) >= check_cred &&175 handle->h_revoke_credits >= revoke_cred)176 return 0;177 extend_cred = max(0, extend_cred - jbd2_handle_buffer_credits(handle));178 revoke_cred = max(0, revoke_cred - handle->h_revoke_credits);179 return ext4_journal_extend(handle, extend_cred, revoke_cred);180}181 182static void ext4_journal_abort_handle(const char *caller, unsigned int line,183 const char *err_fn,184 struct buffer_head *bh,185 handle_t *handle, int err)186{187 char nbuf[16];188 const char *errstr = ext4_decode_error(NULL, err, nbuf);189 190 BUG_ON(!ext4_handle_valid(handle));191 192 if (bh)193 BUFFER_TRACE(bh, "abort");194 195 if (!handle->h_err)196 handle->h_err = err;197 198 if (is_handle_aborted(handle))199 return;200 201 printk(KERN_ERR "EXT4-fs: %s:%d: aborting transaction: %s in %s\n",202 caller, line, errstr, err_fn);203 204 jbd2_journal_abort_handle(handle);205}206 207static void ext4_check_bdev_write_error(struct super_block *sb)208{209 struct address_space *mapping = sb->s_bdev->bd_mapping;210 struct ext4_sb_info *sbi = EXT4_SB(sb);211 int err;212 213 /*214 * If the block device has write error flag, it may have failed to215 * async write out metadata buffers in the background. In this case,216 * we could read old data from disk and write it out again, which217 * may lead to on-disk filesystem inconsistency.218 */219 if (errseq_check(&mapping->wb_err, READ_ONCE(sbi->s_bdev_wb_err))) {220 spin_lock(&sbi->s_bdev_wb_lock);221 err = errseq_check_and_advance(&mapping->wb_err, &sbi->s_bdev_wb_err);222 spin_unlock(&sbi->s_bdev_wb_lock);223 if (err)224 ext4_error_err(sb, -err,225 "Error while async write back metadata");226 }227}228 229int __ext4_journal_get_write_access(const char *where, unsigned int line,230 handle_t *handle, struct super_block *sb,231 struct buffer_head *bh,232 enum ext4_journal_trigger_type trigger_type)233{234 int err;235 236 might_sleep();237 238 if (ext4_handle_valid(handle)) {239 err = jbd2_journal_get_write_access(handle, bh);240 if (err) {241 ext4_journal_abort_handle(where, line, __func__, bh,242 handle, err);243 return err;244 }245 } else246 ext4_check_bdev_write_error(sb);247 if (trigger_type == EXT4_JTR_NONE || !ext4_has_metadata_csum(sb))248 return 0;249 BUG_ON(trigger_type >= EXT4_JOURNAL_TRIGGER_COUNT);250 jbd2_journal_set_triggers(bh,251 &EXT4_SB(sb)->s_journal_triggers[trigger_type].tr_triggers);252 return 0;253}254 255/*256 * The ext4 forget function must perform a revoke if we are freeing data257 * which has been journaled. Metadata (eg. indirect blocks) must be258 * revoked in all cases.259 *260 * "bh" may be NULL: a metadata block may have been freed from memory261 * but there may still be a record of it in the journal, and that record262 * still needs to be revoked.263 */264int __ext4_forget(const char *where, unsigned int line, handle_t *handle,265 int is_metadata, struct inode *inode,266 struct buffer_head *bh, ext4_fsblk_t blocknr)267{268 int err;269 270 might_sleep();271 272 trace_ext4_forget(inode, is_metadata, blocknr);273 BUFFER_TRACE(bh, "enter");274 275 ext4_debug("forgetting bh %p: is_metadata=%d, mode %o, data mode %x\n",276 bh, is_metadata, inode->i_mode,277 test_opt(inode->i_sb, DATA_FLAGS));278 279 /* In the no journal case, we can just do a bforget and return */280 if (!ext4_handle_valid(handle)) {281 bforget(bh);282 return 0;283 }284 285 /* Never use the revoke function if we are doing full data286 * journaling: there is no need to, and a V1 superblock won't287 * support it. Otherwise, only skip the revoke on un-journaled288 * data blocks. */289 290 if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ||291 (!is_metadata && !ext4_should_journal_data(inode))) {292 if (bh) {293 BUFFER_TRACE(bh, "call jbd2_journal_forget");294 err = jbd2_journal_forget(handle, bh);295 if (err)296 ext4_journal_abort_handle(where, line, __func__,297 bh, handle, err);298 return err;299 }300 return 0;301 }302 303 /*304 * data!=journal && (is_metadata || should_journal_data(inode))305 */306 BUFFER_TRACE(bh, "call jbd2_journal_revoke");307 err = jbd2_journal_revoke(handle, blocknr, bh);308 if (err) {309 ext4_journal_abort_handle(where, line, __func__,310 bh, handle, err);311 __ext4_error(inode->i_sb, where, line, true, -err, 0,312 "error %d when attempting revoke", err);313 }314 BUFFER_TRACE(bh, "exit");315 return err;316}317 318int __ext4_journal_get_create_access(const char *where, unsigned int line,319 handle_t *handle, struct super_block *sb,320 struct buffer_head *bh,321 enum ext4_journal_trigger_type trigger_type)322{323 int err;324 325 if (!ext4_handle_valid(handle))326 return 0;327 328 err = jbd2_journal_get_create_access(handle, bh);329 if (err) {330 ext4_journal_abort_handle(where, line, __func__, bh, handle,331 err);332 return err;333 }334 if (trigger_type == EXT4_JTR_NONE || !ext4_has_metadata_csum(sb))335 return 0;336 BUG_ON(trigger_type >= EXT4_JOURNAL_TRIGGER_COUNT);337 jbd2_journal_set_triggers(bh,338 &EXT4_SB(sb)->s_journal_triggers[trigger_type].tr_triggers);339 return 0;340}341 342int __ext4_handle_dirty_metadata(const char *where, unsigned int line,343 handle_t *handle, struct inode *inode,344 struct buffer_head *bh)345{346 int err = 0;347 348 might_sleep();349 350 set_buffer_meta(bh);351 set_buffer_prio(bh);352 set_buffer_uptodate(bh);353 if (ext4_handle_valid(handle)) {354 err = jbd2_journal_dirty_metadata(handle, bh);355 /* Errors can only happen due to aborted journal or a nasty bug */356 if (!is_handle_aborted(handle) && WARN_ON_ONCE(err)) {357 ext4_journal_abort_handle(where, line, __func__, bh,358 handle, err);359 if (inode == NULL) {360 pr_err("EXT4: jbd2_journal_dirty_metadata "361 "failed: handle type %u started at "362 "line %u, credits %u/%u, errcode %d",363 handle->h_type,364 handle->h_line_no,365 handle->h_requested_credits,366 jbd2_handle_buffer_credits(handle), err);367 return err;368 }369 ext4_error_inode(inode, where, line,370 bh->b_blocknr,371 "journal_dirty_metadata failed: "372 "handle type %u started at line %u, "373 "credits %u/%u, errcode %d",374 handle->h_type,375 handle->h_line_no,376 handle->h_requested_credits,377 jbd2_handle_buffer_credits(handle),378 err);379 }380 } else {381 if (inode)382 mark_buffer_dirty_inode(bh, inode);383 else384 mark_buffer_dirty(bh);385 if (inode && inode_needs_sync(inode)) {386 sync_dirty_buffer(bh);387 if (buffer_req(bh) && !buffer_uptodate(bh)) {388 ext4_error_inode_err(inode, where, line,389 bh->b_blocknr, EIO,390 "IO error syncing itable block");391 err = -EIO;392 }393 }394 }395 return err;396}397