Hi, This patch adds skeleton of functionality for checkpoints checking.
With the best regards, Vyacheslav Dubeyko. -- From: Vyacheslav Dubeyko <[email protected]> Subject: [PATCH v4 11/15] nilfs-utils: fsck: add skeleton of functionality for checkpoints checking This patch adds skeleton of functionality for checkpoints checking. Signed-off-by: Vyacheslav Dubeyko <[email protected]> --- sbin/fsck/nilfs_checkpoint.c | 154 ++++++++++++++++++++++++++++++++++++++++++ sbin/fsck/nilfs_checkpoint.h | 50 ++++++++++++++ 2 files changed, 204 insertions(+) create mode 100644 sbin/fsck/nilfs_checkpoint.c create mode 100644 sbin/fsck/nilfs_checkpoint.h diff --git a/sbin/fsck/nilfs_checkpoint.c b/sbin/fsck/nilfs_checkpoint.c new file mode 100644 index 0000000..5476876 --- /dev/null +++ b/sbin/fsck/nilfs_checkpoint.c @@ -0,0 +1,154 @@ +/* + * nilfs_checkpoint.c - NILFS checkpoints and snapshots checking, + * processing and recovering operations implementation + * + * Copyright (C) 2012 Vyacheslav Dubeyko <[email protected]> + * + * This file is part of NILFS. + * + * NILFS is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * NILFS is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with NILFS; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * + * Written by Vyacheslav Dubeyko <[email protected]> + */ + +#include "fsck_common.h" +#include "fsck_raw_ops.h" + +#include "nilfs_checkpoint.h" + +/***************************************************************************** + * FUNCTIONS DECLARATION + *****************************************************************************/ + +/***************************************************************************** + * IMPLEMENTATION SECTION + *****************************************************************************/ + +/***************************************************************************** + * NAME: first_snapshot_number (fsck.nilfs2) + * + * FUNCTION: Get first snapshot number in the list. + * + * RETURNS: + * A. First snapshot number in the case of success. + * B. The UNDEFINED_SNAPSHOT in the case of failure. + */ +__u64 first_snapshot_number(void) +{ + /*internal_info("<%s>: %s", __func__, nilfs_message[NOT_IMPLEMENTED]);*/ + /* <TODO: implement> */ + return UNDEFINED_SNAPSHOT; +} /* first_snapshot_number() */ + +/***************************************************************************** + * NAME: next_snapshot_number (fsck.nilfs2) + * + * FUNCTION: Get next snapshot number in the list. + * + * PARAMETERS: + * @prev_snapshot: Number of previous snapshot in the list. + * + * RETURNS: + * A. Next snapshot number in the case of success. + * B. UNDEFINED_SNAPSHOT in the case of failure or empty list. + * C. Last snapshot number in the case of equality of @prev_snapshot to + * last snapshot number. + */ +__u64 next_snapshot_number(__u64 prev_snapshot) +{ + if (UNDEFINED_SNAPSHOT == prev_snapshot) + return UNDEFINED_SNAPSHOT; + + if (0 == snapshots_count()) + return UNDEFINED_SNAPSHOT; + + if (prev_snapshot == last_snapshot_number()) + return prev_snapshot; + + if (prev_snapshot > last_snapshot_number()) + return UNDEFINED_SNAPSHOT; + + /*internal_info("<%s>: %s", __func__, nilfs_message[NOT_IMPLEMENTED]);*/ + + /* <TODO: implement > */ + return UNDEFINED_SNAPSHOT; +} /* next_snapshot_number() */ + +/***************************************************************************** + * NAME: last_snapshot_number (fsck.nilfs2) + * + * FUNCTION: Get last snapshot number in the list. + * + * RETURNS: + * A. First snapshot number in the case of success. + * B. The UNDEFINED_SNAPSHOT in the case of failure. + */ +__u64 last_snapshot_number(void) +{ + /*internal_info("<%s>: %s", __func__, nilfs_message[NOT_IMPLEMENTED]);*/ + /* <TODO: implement > */ + return UNDEFINED_SNAPSHOT; +} /* last_snapshot_number() */ + +/***************************************************************************** + * NAME: snapshots_count (fsck.nilfs2) + * + * FUNCTION: Get snapshots count in the list. + * + * RETURNS: + * A. Snapshots count in the list for the case of success. + */ +__u64 snapshots_count(void) +{ + /*internal_info("<%s>: %s", __func__, nilfs_message[NOT_IMPLEMENTED]);*/ + /* <TODO: implement > */ + return 0; +} /* snapshots_count() */ + +/***************************************************************************** + * NAME: check_snapshot (fsck.nilfs2) + * + * FUNCTION: It checks validity of metadata structures for snapshot number. + * It means that it takes into account all changes were made + * before (and inclusive) requested snapshot. This function builds + * block bitmap on the basis of DAT file information. Also it builds + * inode bitmap on the basis of ifile information. + * + * PARAMETERS: + * @snapshot: Snapshot number for check. + * + * RETURNS: + * NILFS_OK - Snapshot was checked successfully. + * %-CANNOT_CHECK_SNAPSHOT - Snapshot checking fails because of internal error. + * %-INVALID_PARAMETER - Input parameters are invalid. + */ +int check_snapshot(__u64 snapshot) +{ + int err = NILFS_OK; + + internal_debug("begin to check snapshot: %lld.", snapshot); + + /*if (UNDEFINED_SNAPSHOT == snapshot || + snapshot > last_snapshot_number()) { + internal_debug("<%s>: %s.", + __func__, nilfs_message[INVALID_PARAMETER]); + return -INVALID_PARAMETER; + }*/ + + /*internal_info("<%s>: %s", __func__, nilfs_message[NOT_IMPLEMENTED]);*/ + + /* <TODO: implement> */ + return err; +} /* check_snapshot() */ diff --git a/sbin/fsck/nilfs_checkpoint.h b/sbin/fsck/nilfs_checkpoint.h new file mode 100644 index 0000000..3e951ad --- /dev/null +++ b/sbin/fsck/nilfs_checkpoint.h @@ -0,0 +1,50 @@ +/* + * nilfs_checkpoint.h - Declarations of operations for NILFS checkpoints + * and snapshots checking, processing and recovering + * + * Copyright (C) 2012 Vyacheslav Dubeyko <[email protected]> + * + * This file is part of NILFS. + * + * NILFS is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * NILFS is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with NILFS; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * + * Written by Vyacheslav Dubeyko <[email protected]> + */ + +#ifndef NILFS_CHECKPOINT_H +#define NILFS_CHECKPOINT_H + +/* Get first snapshot number in the list */ +__u64 first_snapshot_number(void); + +/* Get next snapshot number in the list */ +__u64 next_snapshot_number(__u64 prev_snapshot); + +/* Get last snapshot number in the list */ +__u64 last_snapshot_number(void); + +/* Get snapshots count in the list */ +__u64 snapshots_count(void); + +/* + * It checks validity of metadata structures for snapshot number. + * It means that it takes into account all changes were made + * before (and inclusive) requested snapshot. This function builds + * block bitmap on the basis of DAT file information. Also it builds + * inode bitmap on the basis of ifile information. + */ +int check_snapshot(__u64 snapshot); + +#endif /* NILFS_CHECKPOINT_H */ -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-nilfs" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
