398 строки
11 KiB
C
398 строки
11 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Interface between ext4 and JBD
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*/
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#include "ext4_jbd2.h"
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#include <trace/events/ext4.h>
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int ext4_inode_journal_mode(struct inode *inode)
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{
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if (EXT4_JOURNAL(inode) == NULL)
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return EXT4_INODE_WRITEBACK_DATA_MODE; /* writeback */
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/* We do not support data journalling with delayed allocation */
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if (!S_ISREG(inode->i_mode) ||
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ext4_test_inode_flag(inode, EXT4_INODE_EA_INODE) ||
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test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ||
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(ext4_test_inode_flag(inode, EXT4_INODE_JOURNAL_DATA) &&
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!test_opt(inode->i_sb, DELALLOC))) {
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/* We do not support data journalling for encrypted data */
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if (S_ISREG(inode->i_mode) && IS_ENCRYPTED(inode))
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return EXT4_INODE_ORDERED_DATA_MODE; /* ordered */
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return EXT4_INODE_JOURNAL_DATA_MODE; /* journal data */
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}
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if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
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return EXT4_INODE_ORDERED_DATA_MODE; /* ordered */
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if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
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return EXT4_INODE_WRITEBACK_DATA_MODE; /* writeback */
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BUG();
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}
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/* Just increment the non-pointer handle value */
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static handle_t *ext4_get_nojournal(void)
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{
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handle_t *handle = current->journal_info;
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unsigned long ref_cnt = (unsigned long)handle;
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BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
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ref_cnt++;
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handle = (handle_t *)ref_cnt;
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current->journal_info = handle;
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return handle;
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}
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/* Decrement the non-pointer handle value */
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static void ext4_put_nojournal(handle_t *handle)
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{
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unsigned long ref_cnt = (unsigned long)handle;
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BUG_ON(ref_cnt == 0);
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ref_cnt--;
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handle = (handle_t *)ref_cnt;
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current->journal_info = handle;
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}
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/*
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* Wrappers for jbd2_journal_start/end.
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*/
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static int ext4_journal_check_start(struct super_block *sb)
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{
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journal_t *journal;
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might_sleep();
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if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
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return -EIO;
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if (sb_rdonly(sb))
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return -EROFS;
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WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE);
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journal = EXT4_SB(sb)->s_journal;
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/*
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* Special case here: if the journal has aborted behind our
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* backs (eg. EIO in the commit thread), then we still need to
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* take the FS itself readonly cleanly.
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*/
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if (journal && is_journal_aborted(journal)) {
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ext4_abort(sb, -journal->j_errno, "Detected aborted journal");
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return -EROFS;
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}
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return 0;
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}
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handle_t *__ext4_journal_start_sb(struct inode *inode,
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struct super_block *sb, unsigned int line,
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int type, int blocks, int rsv_blocks,
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int revoke_creds)
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{
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journal_t *journal;
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int err;
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if (inode)
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trace_ext4_journal_start_inode(inode, blocks, rsv_blocks,
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revoke_creds, type,
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_RET_IP_);
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else
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trace_ext4_journal_start_sb(sb, blocks, rsv_blocks,
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revoke_creds, type,
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_RET_IP_);
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err = ext4_journal_check_start(sb);
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if (err < 0)
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return ERR_PTR(err);
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journal = EXT4_SB(sb)->s_journal;
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if (!journal || (EXT4_SB(sb)->s_mount_state & EXT4_FC_REPLAY))
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return ext4_get_nojournal();
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return jbd2__journal_start(journal, blocks, rsv_blocks, revoke_creds,
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GFP_NOFS, type, line);
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}
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int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
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{
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struct super_block *sb;
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int err;
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int rc;
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if (!ext4_handle_valid(handle)) {
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ext4_put_nojournal(handle);
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return 0;
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}
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err = handle->h_err;
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if (!handle->h_transaction) {
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rc = jbd2_journal_stop(handle);
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return err ? err : rc;
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}
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sb = handle->h_transaction->t_journal->j_private;
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rc = jbd2_journal_stop(handle);
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if (!err)
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err = rc;
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if (err)
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__ext4_std_error(sb, where, line, err);
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return err;
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}
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handle_t *__ext4_journal_start_reserved(handle_t *handle, unsigned int line,
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int type)
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{
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struct super_block *sb;
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int err;
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if (!ext4_handle_valid(handle))
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return ext4_get_nojournal();
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sb = handle->h_journal->j_private;
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trace_ext4_journal_start_reserved(sb,
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jbd2_handle_buffer_credits(handle), _RET_IP_);
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err = ext4_journal_check_start(sb);
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if (err < 0) {
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jbd2_journal_free_reserved(handle);
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return ERR_PTR(err);
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}
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err = jbd2_journal_start_reserved(handle, type, line);
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if (err < 0)
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return ERR_PTR(err);
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return handle;
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}
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int __ext4_journal_ensure_credits(handle_t *handle, int check_cred,
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int extend_cred, int revoke_cred)
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{
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if (!ext4_handle_valid(handle))
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return 0;
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if (is_handle_aborted(handle))
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return -EROFS;
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if (jbd2_handle_buffer_credits(handle) >= check_cred &&
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handle->h_revoke_credits >= revoke_cred)
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return 0;
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extend_cred = max(0, extend_cred - jbd2_handle_buffer_credits(handle));
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revoke_cred = max(0, revoke_cred - handle->h_revoke_credits);
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return ext4_journal_extend(handle, extend_cred, revoke_cred);
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}
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static void ext4_journal_abort_handle(const char *caller, unsigned int line,
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const char *err_fn,
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struct buffer_head *bh,
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handle_t *handle, int err)
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{
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char nbuf[16];
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const char *errstr = ext4_decode_error(NULL, err, nbuf);
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BUG_ON(!ext4_handle_valid(handle));
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if (bh)
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BUFFER_TRACE(bh, "abort");
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if (!handle->h_err)
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handle->h_err = err;
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if (is_handle_aborted(handle))
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return;
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printk(KERN_ERR "EXT4-fs: %s:%d: aborting transaction: %s in %s\n",
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caller, line, errstr, err_fn);
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jbd2_journal_abort_handle(handle);
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}
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static void ext4_check_bdev_write_error(struct super_block *sb)
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{
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struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping;
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struct ext4_sb_info *sbi = EXT4_SB(sb);
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int err;
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/*
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* If the block device has write error flag, it may have failed to
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* async write out metadata buffers in the background. In this case,
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* we could read old data from disk and write it out again, which
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* may lead to on-disk filesystem inconsistency.
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*/
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if (errseq_check(&mapping->wb_err, READ_ONCE(sbi->s_bdev_wb_err))) {
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spin_lock(&sbi->s_bdev_wb_lock);
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err = errseq_check_and_advance(&mapping->wb_err, &sbi->s_bdev_wb_err);
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spin_unlock(&sbi->s_bdev_wb_lock);
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if (err)
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ext4_error_err(sb, -err,
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"Error while async write back metadata");
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}
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}
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int __ext4_journal_get_write_access(const char *where, unsigned int line,
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handle_t *handle, struct super_block *sb,
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struct buffer_head *bh,
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enum ext4_journal_trigger_type trigger_type)
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{
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int err;
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might_sleep();
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if (bh->b_bdev->bd_super)
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ext4_check_bdev_write_error(bh->b_bdev->bd_super);
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if (ext4_handle_valid(handle)) {
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err = jbd2_journal_get_write_access(handle, bh);
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if (err) {
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ext4_journal_abort_handle(where, line, __func__, bh,
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handle, err);
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return err;
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}
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}
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if (trigger_type == EXT4_JTR_NONE || !ext4_has_metadata_csum(sb))
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return 0;
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BUG_ON(trigger_type >= EXT4_JOURNAL_TRIGGER_COUNT);
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jbd2_journal_set_triggers(bh,
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&EXT4_SB(sb)->s_journal_triggers[trigger_type].tr_triggers);
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return 0;
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}
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/*
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* The ext4 forget function must perform a revoke if we are freeing data
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* which has been journaled. Metadata (eg. indirect blocks) must be
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* revoked in all cases.
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*
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* "bh" may be NULL: a metadata block may have been freed from memory
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* but there may still be a record of it in the journal, and that record
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* still needs to be revoked.
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*/
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int __ext4_forget(const char *where, unsigned int line, handle_t *handle,
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int is_metadata, struct inode *inode,
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struct buffer_head *bh, ext4_fsblk_t blocknr)
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{
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int err;
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might_sleep();
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trace_ext4_forget(inode, is_metadata, blocknr);
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BUFFER_TRACE(bh, "enter");
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ext4_debug("forgetting bh %p: is_metadata=%d, mode %o, data mode %x\n",
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bh, is_metadata, inode->i_mode,
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test_opt(inode->i_sb, DATA_FLAGS));
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/* In the no journal case, we can just do a bforget and return */
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if (!ext4_handle_valid(handle)) {
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bforget(bh);
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return 0;
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}
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/* Never use the revoke function if we are doing full data
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* journaling: there is no need to, and a V1 superblock won't
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* support it. Otherwise, only skip the revoke on un-journaled
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* data blocks. */
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if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ||
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(!is_metadata && !ext4_should_journal_data(inode))) {
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if (bh) {
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BUFFER_TRACE(bh, "call jbd2_journal_forget");
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err = jbd2_journal_forget(handle, bh);
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if (err)
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ext4_journal_abort_handle(where, line, __func__,
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bh, handle, err);
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return err;
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}
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return 0;
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}
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/*
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* data!=journal && (is_metadata || should_journal_data(inode))
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*/
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BUFFER_TRACE(bh, "call jbd2_journal_revoke");
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err = jbd2_journal_revoke(handle, blocknr, bh);
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if (err) {
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ext4_journal_abort_handle(where, line, __func__,
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bh, handle, err);
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__ext4_error(inode->i_sb, where, line, true, -err, 0,
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"error %d when attempting revoke", err);
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}
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BUFFER_TRACE(bh, "exit");
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return err;
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}
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int __ext4_journal_get_create_access(const char *where, unsigned int line,
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handle_t *handle, struct super_block *sb,
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struct buffer_head *bh,
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enum ext4_journal_trigger_type trigger_type)
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{
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int err;
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if (!ext4_handle_valid(handle))
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return 0;
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err = jbd2_journal_get_create_access(handle, bh);
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if (err) {
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ext4_journal_abort_handle(where, line, __func__, bh, handle,
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err);
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return err;
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}
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if (trigger_type == EXT4_JTR_NONE || !ext4_has_metadata_csum(sb))
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return 0;
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BUG_ON(trigger_type >= EXT4_JOURNAL_TRIGGER_COUNT);
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jbd2_journal_set_triggers(bh,
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&EXT4_SB(sb)->s_journal_triggers[trigger_type].tr_triggers);
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return 0;
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}
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int __ext4_handle_dirty_metadata(const char *where, unsigned int line,
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handle_t *handle, struct inode *inode,
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struct buffer_head *bh)
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{
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int err = 0;
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might_sleep();
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set_buffer_meta(bh);
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set_buffer_prio(bh);
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set_buffer_uptodate(bh);
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if (ext4_handle_valid(handle)) {
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err = jbd2_journal_dirty_metadata(handle, bh);
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/* Errors can only happen due to aborted journal or a nasty bug */
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if (!is_handle_aborted(handle) && WARN_ON_ONCE(err)) {
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ext4_journal_abort_handle(where, line, __func__, bh,
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handle, err);
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if (inode == NULL) {
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pr_err("EXT4: jbd2_journal_dirty_metadata "
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"failed: handle type %u started at "
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"line %u, credits %u/%u, errcode %d",
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handle->h_type,
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handle->h_line_no,
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handle->h_requested_credits,
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jbd2_handle_buffer_credits(handle), err);
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return err;
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}
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ext4_error_inode(inode, where, line,
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bh->b_blocknr,
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"journal_dirty_metadata failed: "
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"handle type %u started at line %u, "
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"credits %u/%u, errcode %d",
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handle->h_type,
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handle->h_line_no,
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handle->h_requested_credits,
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jbd2_handle_buffer_credits(handle),
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err);
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}
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} else {
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if (inode)
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mark_buffer_dirty_inode(bh, inode);
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else
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mark_buffer_dirty(bh);
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if (inode && inode_needs_sync(inode)) {
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sync_dirty_buffer(bh);
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if (buffer_req(bh) && !buffer_uptodate(bh)) {
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ext4_error_inode_err(inode, where, line,
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bh->b_blocknr, EIO,
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"IO error syncing itable block");
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err = -EIO;
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}
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}
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}
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return err;
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}
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