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ae1495b12d
While it's true that errors can only happen if there is a bug in jbd2_journal_dirty_metadata(), if a bug does happen, we need to halt the kernel or remount the file system read-only in order to avoid further data loss. The ext4_journal_abort_handle() function doesn't do any of this, and while it's likely that this call (since it doesn't adjust refcounts) will likely result in the file system eventually deadlocking since the current transaction will never be able to close, it's much cleaner to call let ext4's error handling system deal with this situation. There's a separate bug here which is that if certain jbd2 errors errors occur and file system is mounted errors=continue, the file system will probably eventually end grind to a halt as described above. But things have been this way in a long time, and usually when we have these sorts of errors it's pretty much a disaster --- and that's why the jbd2 layer aggressively retries memory allocations, which is the most likely cause of these jbd2 errors. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Reviewed-by: Jan Kara <jack@suse.cz> Cc: stable@vger.kernel.org
311 lines
7.4 KiB
C
311 lines
7.4 KiB
C
/*
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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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/* 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 (sb->s_flags & MS_RDONLY)
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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, "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 super_block *sb, unsigned int line,
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int type, int blocks, int rsv_blocks)
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{
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journal_t *journal;
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int err;
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trace_ext4_journal_start(sb, blocks, rsv_blocks, _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)
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return ext4_get_nojournal();
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return jbd2__journal_start(journal, blocks, rsv_blocks, GFP_NOFS,
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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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sb = handle->h_transaction->t_journal->j_private;
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err = handle->h_err;
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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, handle->h_buffer_credits,
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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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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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void ext4_journal_abort_handle(const char *caller, unsigned int line,
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const char *err_fn, 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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int __ext4_journal_get_write_access(const char *where, unsigned int line,
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handle_t *handle, 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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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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}
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return err;
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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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* If the handle isn't valid we're not journaling, but we still need to
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* call into ext4_journal_revoke() to put the buffer head.
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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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jbd_debug(4, "forgetting bh %p: is_metadata = %d, mode %o, "
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"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_abort(inode->i_sb, where, line,
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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 buffer_head *bh)
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{
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int err = 0;
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if (ext4_handle_valid(handle)) {
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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__,
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bh, handle, err);
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}
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return err;
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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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if (ext4_handle_valid(handle)) {
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err = jbd2_journal_dirty_metadata(handle, bh);
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/* Errors can only happen if there is a bug */
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if (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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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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handle->h_buffer_credits, 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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struct ext4_super_block *es;
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es = EXT4_SB(inode->i_sb)->s_es;
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es->s_last_error_block =
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cpu_to_le64(bh->b_blocknr);
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ext4_error_inode(inode, where, line,
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bh->b_blocknr,
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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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int __ext4_handle_dirty_super(const char *where, unsigned int line,
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handle_t *handle, struct super_block *sb)
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{
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struct buffer_head *bh = EXT4_SB(sb)->s_sbh;
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int err = 0;
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ext4_superblock_csum_set(sb);
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if (ext4_handle_valid(handle)) {
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err = jbd2_journal_dirty_metadata(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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} else
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mark_buffer_dirty(bh);
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return err;
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}
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