diff options
| -rw-r--r-- | fs/xfs/xfs_buf_item.c | 214 |
1 files changed, 144 insertions, 70 deletions
diff --git a/fs/xfs/xfs_buf_item.c b/fs/xfs/xfs_buf_item.c index 09bfe9c52dbd..f80fc5bd3bff 100644 --- a/fs/xfs/xfs_buf_item.c +++ b/fs/xfs/xfs_buf_item.c @@ -986,21 +986,24 @@ xfs_buf_do_callbacks_fail( spin_unlock(&ailp->ail_lock); } +/* + * Decide if we're going to retry the write after a failure, and prepare + * the buffer for retrying the write. + */ static bool -xfs_buf_iodone_callback_error( +xfs_buf_ioerror_fail_without_retry( struct xfs_buf *bp) { struct xfs_mount *mp = bp->b_mount; static ulong lasttime; static xfs_buftarg_t *lasttarg; - struct xfs_error_cfg *cfg; /* * If we've already decided to shutdown the filesystem because of * I/O errors, there's no point in giving this a retry. */ if (XFS_FORCED_SHUTDOWN(mp)) - goto out_stale; + return true; if (bp->b_target != lasttarg || time_after(jiffies, (lasttime + 5*HZ))) { @@ -1011,91 +1014,114 @@ xfs_buf_iodone_callback_error( /* synchronous writes will have callers process the error */ if (!(bp->b_flags & XBF_ASYNC)) - goto out_stale; - - trace_xfs_buf_item_iodone_async(bp, _RET_IP_); - - cfg = xfs_error_get_cfg(mp, XFS_ERR_METADATA, bp->b_error); + return true; + return false; +} - /* - * If the write was asynchronous then no one will be looking for the - * error. If this is the first failure of this type, clear the error - * state and write the buffer out again. This means we always retry an - * async write failure at least once, but we also need to set the buffer - * up to behave correctly now for repeated failures. - */ - if (!(bp->b_flags & (XBF_STALE | XBF_WRITE_FAIL)) || - bp->b_last_error != bp->b_error) { - bp->b_flags |= (XBF_WRITE | XBF_DONE | XBF_WRITE_FAIL); - bp->b_last_error = bp->b_error; - if (cfg->retry_timeout != XFS_ERR_RETRY_FOREVER && - !bp->b_first_retry_time) - bp->b_first_retry_time = jiffies; +static bool +xfs_buf_ioerror_retry( + struct xfs_buf *bp, + struct xfs_error_cfg *cfg) +{ + if ((bp->b_flags & (XBF_STALE | XBF_WRITE_FAIL)) && + bp->b_last_error == bp->b_error) + return false; - xfs_buf_ioerror(bp, 0); - xfs_buf_submit(bp); - return true; - } + bp->b_flags |= (XBF_WRITE | XBF_DONE | XBF_WRITE_FAIL); + bp->b_last_error = bp->b_error; + if (cfg->retry_timeout != XFS_ERR_RETRY_FOREVER && + !bp->b_first_retry_time) + bp->b_first_retry_time = jiffies; + return true; +} - /* - * Repeated failure on an async write. Take action according to the - * error configuration we have been set up to use. - */ +/* + * Account for this latest trip around the retry handler, and decide if + * we've failed enough times to constitute a permanent failure. + */ +static bool +xfs_buf_ioerror_permanent( + struct xfs_buf *bp, + struct xfs_error_cfg *cfg) +{ + struct xfs_mount *mp = bp->b_mount; if (cfg->max_retries != XFS_ERR_RETRY_FOREVER && ++bp->b_retries > cfg->max_retries) - goto permanent_error; + return true; if (cfg->retry_timeout != XFS_ERR_RETRY_FOREVER && time_after(jiffies, cfg->retry_timeout + bp->b_first_retry_time)) - goto permanent_error; + return true; /* At unmount we may treat errors differently */ if ((mp->m_flags & XFS_MOUNT_UNMOUNTING) && mp->m_fail_unmount) - goto permanent_error; - - /* - * Still a transient error, run IO completion failure callbacks and let - * the higher layers retry the buffer. - */ - xfs_buf_do_callbacks_fail(bp); - xfs_buf_ioerror(bp, 0); - xfs_buf_relse(bp); - return true; + return true; - /* - * Permanent error - we need to trigger a shutdown if we haven't already - * to indicate that inconsistency will result from this action. - */ -permanent_error: - xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR); -out_stale: - xfs_buf_stale(bp); - bp->b_flags |= XBF_DONE; - trace_xfs_buf_error_relse(bp, _RET_IP_); return false; } -static inline bool -xfs_buf_had_callback_errors( +/* + * On a sync write or shutdown we just want to stale the buffer and let the + * caller handle the error in bp->b_error appropriately. + * + * If the write was asynchronous then no one will be looking for the error. If + * this is the first failure of this type, clear the error state and write the + * buffer out again. This means we always retry an async write failure at least + * once, but we also need to set the buffer up to behave correctly now for + * repeated failures. + * + * If we get repeated async write failures, then we take action according to the + * error configuration we have been set up to use. + * + * Multi-state return value: + * + * XBF_IOERROR_FINISH: clear IO error retry state and run callback completions + * XBF_IOERROR_DONE: resubmitted immediately, do not run any completions + * XBF_IOERROR_FAIL: transient error, run failure callback completions and then + * release the buffer + */ +enum { + XBF_IOERROR_FINISH, + XBF_IOERROR_DONE, + XBF_IOERROR_FAIL, +}; + +static int +xfs_buf_iodone_error( struct xfs_buf *bp) { + struct xfs_mount *mp = bp->b_mount; + struct xfs_error_cfg *cfg; - /* - * If there is an error, process it. Some errors require us to run - * callbacks after failure processing is done so we detect that and take - * appropriate action. - */ - if (bp->b_error && xfs_buf_iodone_callback_error(bp)) - return true; + if (xfs_buf_ioerror_fail_without_retry(bp)) + goto out_stale; + + trace_xfs_buf_item_iodone_async(bp, _RET_IP_); + + cfg = xfs_error_get_cfg(mp, XFS_ERR_METADATA, bp->b_error); + if (xfs_buf_ioerror_retry(bp, cfg)) { + xfs_buf_ioerror(bp, 0); + xfs_buf_submit(bp); + return XBF_IOERROR_DONE; + } /* - * Successful IO or permanent error. Either way, we can clear the - * retry state here in preparation for the next error that may occur. + * Permanent error - we need to trigger a shutdown if we haven't already + * to indicate that inconsistency will result from this action. */ - bp->b_last_error = 0; - bp->b_retries = 0; - bp->b_first_retry_time = 0; - return false; + if (xfs_buf_ioerror_permanent(bp, cfg)) { + xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR); + goto out_stale; + } + + /* Still considered a transient error. Caller will schedule retries. */ + return XBF_IOERROR_FAIL; + +out_stale: + xfs_buf_stale(bp); + bp->b_flags |= XBF_DONE; + trace_xfs_buf_error_relse(bp, _RET_IP_); + return XBF_IOERROR_FINISH; } static void @@ -1122,6 +1148,15 @@ xfs_buf_item_done( xfs_buf_rele(bp); } +static inline void +xfs_buf_clear_ioerror_retry_state( + struct xfs_buf *bp) +{ + bp->b_last_error = 0; + bp->b_retries = 0; + bp->b_first_retry_time = 0; +} + /* * Inode buffer iodone callback function. */ @@ -1129,9 +1164,22 @@ void xfs_buf_inode_iodone( struct xfs_buf *bp) { - if (xfs_buf_had_callback_errors(bp)) + if (bp->b_error) { + int ret = xfs_buf_iodone_error(bp); + + if (ret == XBF_IOERROR_FINISH) + goto finish_iodone; + if (ret == XBF_IOERROR_DONE) + return; + ASSERT(ret == XBF_IOERROR_FAIL); + xfs_buf_do_callbacks_fail(bp); + xfs_buf_ioerror(bp, 0); + xfs_buf_relse(bp); return; + } +finish_iodone: + xfs_buf_clear_ioerror_retry_state(bp); xfs_buf_item_done(bp); xfs_iflush_done(bp); xfs_buf_ioend_finish(bp); @@ -1144,9 +1192,22 @@ void xfs_buf_dquot_iodone( struct xfs_buf *bp) { - if (xfs_buf_had_callback_errors(bp)) + if (bp->b_error) { + int ret = xfs_buf_iodone_error(bp); + + if (ret == XBF_IOERROR_FINISH) + goto finish_iodone; + if (ret == XBF_IOERROR_DONE) + return; + ASSERT(ret == XBF_IOERROR_FAIL); + xfs_buf_do_callbacks_fail(bp); + xfs_buf_ioerror(bp, 0); + xfs_buf_relse(bp); return; + } +finish_iodone: + xfs_buf_clear_ioerror_retry_state(bp); /* a newly allocated dquot buffer might have a log item attached */ xfs_buf_item_done(bp); xfs_dquot_done(bp); @@ -1163,9 +1224,22 @@ void xfs_buf_iodone( struct xfs_buf *bp) { - if (xfs_buf_had_callback_errors(bp)) + if (bp->b_error) { + int ret = xfs_buf_iodone_error(bp); + + if (ret == XBF_IOERROR_FINISH) + goto finish_iodone; + if (ret == XBF_IOERROR_DONE) + return; + ASSERT(ret == XBF_IOERROR_FAIL); + xfs_buf_do_callbacks_fail(bp); + xfs_buf_ioerror(bp, 0); + xfs_buf_relse(bp); return; + } +finish_iodone: + xfs_buf_clear_ioerror_retry_state(bp); xfs_buf_item_done(bp); xfs_buf_ioend_finish(bp); } |