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From: Andiry Xu <jix024@eng.ucsd.edu>
To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-nvdimm@lists.01.org
Cc: dan.j.williams@intel.com, andy.rudoff@intel.com,
	coughlan@redhat.com, swanson@cs.ucsd.edu, david@fromorbit.com,
	jack@suse.com, swhiteho@redhat.com, miklos@szeredi.hu,
	andiry.xu@gmail.com, Andiry Xu <jix024@cs.ucsd.edu>
Subject: [RFC v2 49/83] Dir: Append create/remove dentry.
Date: Sat, 10 Mar 2018 10:18:30 -0800
Message-ID: <1520705944-6723-50-git-send-email-jix024@eng.ucsd.edu> (raw)
In-Reply-To: <1520705944-6723-1-git-send-email-jix024@eng.ucsd.edu>

From: Andiry Xu <jix024@cs.ucsd.edu>

NOVA adds or removes a directory/file by appending a dentry
to the parent directory's log. Dentry contains filename and inode number.
A positive inode number indicates a create(valid) dentry, and
a dentry with inode number zero is a remove dentry.
NOVA can also inplace update a create dentry to invalidate it.

Signed-off-by: Andiry Xu <jix024@cs.ucsd.edu>
---
 fs/nova/dir.c  | 140 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 fs/nova/nova.h |   4 ++
 2 files changed, 144 insertions(+)

diff --git a/fs/nova/dir.c b/fs/nova/dir.c
index 35a66f9..47ee9ad 100644
--- a/fs/nova/dir.c
+++ b/fs/nova/dir.c
@@ -222,6 +222,146 @@ int nova_append_dir_init_entries(struct super_block *sb,
 	return 0;
 }
 
+/* adds a directory entry pointing to the inode. assumes the inode has
+ * already been logged for consistency
+ */
+int nova_add_dentry(struct dentry *dentry, u64 ino, int inc_link,
+	struct nova_inode_update *update, u64 epoch_id)
+{
+	struct inode *dir = dentry->d_parent->d_inode;
+	struct super_block *sb = dir->i_sb;
+	struct nova_inode_info *si = NOVA_I(dir);
+	struct nova_inode_info_header *sih = &si->header;
+	struct nova_inode *pidir;
+	const char *name = dentry->d_name.name;
+	int namelen = dentry->d_name.len;
+	struct nova_dentry *direntry;
+	unsigned short loglen;
+	int ret;
+	u64 curr_entry;
+	timing_t add_dentry_time;
+
+	nova_dbg_verbose("%s: dir %lu new inode %llu\n",
+				__func__, dir->i_ino, ino);
+	nova_dbg_verbose("%s: %s %d\n", __func__, name, namelen);
+	NOVA_START_TIMING(add_dentry_t, add_dentry_time);
+	if (namelen == 0)
+		return -EINVAL;
+
+	pidir = nova_get_inode(sb, dir);
+
+	/*
+	 * XXX shouldn't update any times until successful
+	 * completion of syscall, but too many callers depend
+	 * on this.
+	 */
+	dir->i_mtime = dir->i_ctime = current_time(dir);
+
+	loglen = NOVA_DIR_LOG_REC_LEN(namelen);
+	ret = nova_append_dentry(sb, pidir, dir, dentry,
+				ino, loglen, update,
+				inc_link, epoch_id);
+
+	if (ret) {
+		nova_dbg("%s: append dir entry failure\n", __func__);
+		return ret;
+	}
+
+	curr_entry = update->curr_entry;
+	direntry = (struct nova_dentry *)nova_get_block(sb, curr_entry);
+	sih->last_dentry = curr_entry;
+	ret = nova_insert_dir_radix_tree(sb, sih, name, namelen, direntry);
+
+	sih->trans_id++;
+	NOVA_END_TIMING(add_dentry_t, add_dentry_time);
+	return ret;
+}
+
+static int nova_can_inplace_update_dentry(struct super_block *sb,
+	struct nova_dentry *dentry, u64 epoch_id)
+{
+	if (dentry && dentry->epoch_id == epoch_id)
+		return 1;
+
+	return 0;
+}
+
+/* removes a directory entry pointing to the inode. assumes the inode has
+ * already been logged for consistency
+ */
+int nova_remove_dentry(struct dentry *dentry, int dec_link,
+	struct nova_inode_update *update, u64 epoch_id)
+{
+	struct inode *dir = dentry->d_parent->d_inode;
+	struct super_block *sb = dir->i_sb;
+	struct nova_sb_info *sbi = NOVA_SB(sb);
+	struct nova_inode_info *si = NOVA_I(dir);
+	struct nova_inode_info_header *sih = &si->header;
+	struct nova_inode *pidir;
+	struct qstr *entry = &dentry->d_name;
+	struct nova_dentry *old_dentry = NULL;
+	unsigned short loglen;
+	int ret;
+	u64 curr_entry;
+	timing_t remove_dentry_time;
+
+	NOVA_START_TIMING(remove_dentry_t, remove_dentry_time);
+
+	update->create_dentry = NULL;
+	update->delete_dentry = NULL;
+
+	if (!dentry->d_name.len) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	ret = nova_remove_dir_radix_tree(sb, sih, entry->name, entry->len, 0,
+					&old_dentry);
+
+	if (ret)
+		goto out;
+
+	pidir = nova_get_inode(sb, dir);
+
+	dir->i_mtime = dir->i_ctime = current_time(dir);
+
+	if (nova_can_inplace_update_dentry(sb, old_dentry, epoch_id)) {
+		nova_inplace_update_dentry(sb, dir, old_dentry,
+						dec_link, epoch_id);
+		curr_entry = nova_get_addr_off(sbi, old_dentry);
+
+		sih->last_dentry = curr_entry;
+		/* Leave create/delete_dentry to NULL
+		 * Do not change tail if used as input
+		 */
+		if (update->tail == 0) {
+			update->tail = sih->log_tail;
+		}
+		sih->trans_id++;
+		goto out;
+	}
+
+	loglen = NOVA_DIR_LOG_REC_LEN(entry->len);
+	ret = nova_append_dentry(sb, pidir, dir, dentry,
+				0, loglen, update,
+				dec_link, epoch_id);
+
+	if (ret) {
+		nova_dbg("%s: append dir entry failure\n", __func__);
+		goto out;
+	}
+
+	update->create_dentry = old_dentry;
+	curr_entry = update->curr_entry;
+	update->delete_dentry = (struct nova_dentry *)nova_get_block(sb,
+						curr_entry);
+	sih->last_dentry = curr_entry;
+	sih->trans_id++;
+out:
+	NOVA_END_TIMING(remove_dentry_t, remove_dentry_time);
+	return ret;
+}
+
 static u64 nova_find_next_dentry_addr(struct super_block *sb,
 	struct nova_inode_info_header *sih, u64 pos)
 {
diff --git a/fs/nova/nova.h b/fs/nova/nova.h
index ed269fe..3a51dae 100644
--- a/fs/nova/nova.h
+++ b/fs/nova/nova.h
@@ -461,6 +461,10 @@ struct nova_dentry *nova_find_dentry(struct super_block *sb,
 	unsigned long name_len);
 int nova_append_dir_init_entries(struct super_block *sb,
 	struct nova_inode *pi, u64 self_ino, u64 parent_ino, u64 epoch_id);
+int nova_add_dentry(struct dentry *dentry, u64 ino, int inc_link,
+	struct nova_inode_update *update, u64 epoch_id);
+int nova_remove_dentry(struct dentry *dentry, int dec_link,
+	struct nova_inode_update *update, u64 epoch_id);
 
 /* rebuild.c */
 int nova_rebuild_inode(struct super_block *sb, struct nova_inode_info *si,
-- 
2.7.4

  parent reply index

Thread overview: 119+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-10 18:17 [RFC v2 00/83] NOVA: a new file system for persistent memory Andiry Xu
2018-03-10 18:17 ` [RFC v2 01/83] Introduction and documentation of NOVA filesystem Andiry Xu
2018-03-19 20:43   ` Randy Dunlap
2018-03-19 23:00     ` Andiry Xu
2018-04-22  8:05   ` Pavel Machek
2018-03-10 18:17 ` [RFC v2 02/83] Add nova_def.h Andiry Xu
2018-03-10 18:17 ` [RFC v2 03/83] Add super.h Andiry Xu
2018-03-15  4:54   ` Darrick J. Wong
2018-03-15  6:11     ` Andiry Xu
2018-03-15  9:05       ` Arnd Bergmann
2018-03-15 17:51         ` Andiry Xu
2018-03-15 20:04           ` Andreas Dilger
2018-03-15 20:38           ` Arnd Bergmann
2018-03-16  2:59             ` Theodore Y. Ts'o
2018-03-16  6:17               ` Andiry Xu
2018-03-16  6:30                 ` Darrick J. Wong
2018-03-16  9:19               ` Arnd Bergmann
2018-03-10 18:17 ` [RFC v2 04/83] NOVA inode definition Andiry Xu
2018-03-15  5:06   ` Darrick J. Wong
2018-03-15  6:16     ` Andiry Xu
2018-03-10 18:17 ` [RFC v2 05/83] Add NOVA filesystem definitions and useful helper routines Andiry Xu
2018-03-11 12:00   ` Nikolay Borisov
2018-03-11 19:22     ` Eric Biggers
2018-03-11 21:45       ` Andiry Xu
2018-03-19 19:39       ` Andiry Xu
2018-03-19 20:30         ` Eric Biggers
2018-03-19 21:59           ` Andiry Xu
2018-03-10 18:17 ` [RFC v2 06/83] Add inode get/read methods Andiry Xu
2018-04-23  6:12   ` Darrick J. Wong
2018-04-23 15:55     ` Andiry Xu
2018-03-10 18:17 ` [RFC v2 07/83] Initialize inode_info and rebuild inode information in nova_iget() Andiry Xu
2018-03-10 18:17 ` [RFC v2 08/83] NOVA superblock operations Andiry Xu
2018-03-10 18:17 ` [RFC v2 09/83] Add Kconfig and Makefile Andiry Xu
2018-03-11 12:15   ` Nikolay Borisov
2018-03-11 21:32     ` Andiry Xu
2018-03-10 18:17 ` [RFC v2 10/83] Add superblock integrity check Andiry Xu
2018-03-10 18:17 ` [RFC v2 11/83] Add timing and I/O statistics for performance analysis and profiling Andiry Xu
2018-03-10 18:17 ` [RFC v2 12/83] Add timing for mount and init Andiry Xu
2018-03-10 18:17 ` [RFC v2 13/83] Add remount_fs and show_options methods Andiry Xu
2018-03-10 18:17 ` [RFC v2 14/83] Add range node kmem cache Andiry Xu
2018-03-11 11:55   ` Nikolay Borisov
2018-03-11 21:31     ` Andiry Xu
2018-03-10 18:17 ` [RFC v2 15/83] Add free list data structure Andiry Xu
2018-03-10 18:17 ` [RFC v2 16/83] Initialize block map and free lists in nova_init() Andiry Xu
2018-03-11 12:12   ` Nikolay Borisov
2018-03-11 21:30     ` Andiry Xu
2018-03-10 18:17 ` [RFC v2 17/83] Add statfs support Andiry Xu
2018-03-10 18:17 ` [RFC v2 18/83] Add freelist statistics printing Andiry Xu
2018-03-10 18:18 ` [RFC v2 19/83] Add pmem block free routines Andiry Xu
2018-03-10 18:18 ` [RFC v2 20/83] Pmem block allocation routines Andiry Xu
2018-03-10 18:18 ` [RFC v2 21/83] Add log structure Andiry Xu
2018-03-10 18:18 ` [RFC v2 22/83] Inode log pages allocation and reclaimation Andiry Xu
2018-03-10 18:18 ` [RFC v2 23/83] Save allocator to pmem in put_super Andiry Xu
2018-03-10 18:18 ` [RFC v2 24/83] Initialize and allocate inode table Andiry Xu
2018-03-10 18:18 ` [RFC v2 25/83] Support get normal inode address and inode table extentsion Andiry Xu
2018-03-10 18:18 ` [RFC v2 26/83] Add inode_map to track inuse inodes Andiry Xu
2018-03-10 18:18 ` [RFC v2 27/83] Save the inode inuse list to pmem upon umount Andiry Xu
2018-03-10 18:18 ` [RFC v2 28/83] Add NOVA address space operations Andiry Xu
2018-03-10 18:18 ` [RFC v2 29/83] Add write_inode and dirty_inode routines Andiry Xu
2018-03-10 18:18 ` [RFC v2 30/83] New NOVA inode allocation Andiry Xu
2018-03-10 18:18 ` [RFC v2 31/83] Add new vfs " Andiry Xu
2018-03-10 18:18 ` [RFC v2 32/83] Add log entry definitions Andiry Xu
2018-03-10 18:18 ` [RFC v2 33/83] Inode log and entry printing for debug purpose Andiry Xu
2018-03-10 18:18 ` [RFC v2 34/83] Journal: NOVA light weight journal definitions Andiry Xu
2018-03-10 18:18 ` [RFC v2 35/83] Journal: Lite journal helper routines Andiry Xu
2018-03-10 18:18 ` [RFC v2 36/83] Journal: Lite journal recovery Andiry Xu
2018-03-10 18:18 ` [RFC v2 37/83] Journal: Lite journal create and commit Andiry Xu
2018-03-10 18:18 ` [RFC v2 38/83] Journal: NOVA lite journal initialization Andiry Xu
2018-03-10 18:18 ` [RFC v2 39/83] Log operation: dentry append Andiry Xu
2018-03-10 18:18 ` [RFC v2 40/83] Log operation: file write entry append Andiry Xu
2018-03-10 18:18 ` [RFC v2 41/83] Log operation: setattr " Andiry Xu
2018-03-10 18:18 ` [RFC v2 42/83] Log operation: link change append Andiry Xu
2018-03-10 18:18 ` [RFC v2 43/83] Log operation: in-place update log entry Andiry Xu
2018-03-10 18:18 ` [RFC v2 44/83] Log operation: invalidate log entries Andiry Xu
2018-03-10 18:18 ` [RFC v2 45/83] Log operation: file inode log lookup and assign Andiry Xu
2018-03-10 18:18 ` [RFC v2 46/83] Dir: Add Directory radix tree insert/remove methods Andiry Xu
2018-03-10 18:18 ` [RFC v2 47/83] Dir: Add initial dentries when initializing a directory inode log Andiry Xu
2018-03-10 18:18 ` [RFC v2 48/83] Dir: Readdir operation Andiry Xu
2018-03-10 18:18 ` Andiry Xu [this message]
2018-03-10 18:18 ` [RFC v2 50/83] Inode: Add nova_evict_inode Andiry Xu
2018-03-10 18:18 ` [RFC v2 51/83] Rebuild: directory inode Andiry Xu
2018-03-10 18:18 ` [RFC v2 52/83] Rebuild: file inode Andiry Xu
2018-03-10 18:18 ` [RFC v2 53/83] Namei: lookup Andiry Xu
2018-03-10 18:18 ` [RFC v2 54/83] Namei: create and mknod Andiry Xu
2018-03-10 18:18 ` [RFC v2 55/83] Namei: mkdir Andiry Xu
2018-03-10 18:18 ` [RFC v2 56/83] Namei: link and unlink Andiry Xu
2018-03-10 18:18 ` [RFC v2 57/83] Namei: rmdir Andiry Xu
2018-03-10 18:18 ` [RFC v2 58/83] Namei: rename Andiry Xu
2018-03-10 18:18 ` [RFC v2 59/83] Namei: setattr Andiry Xu
2018-03-10 18:18 ` [RFC v2 60/83] Add special inode operations Andiry Xu
2018-03-10 18:18 ` [RFC v2 61/83] Super: Add nova_export_ops Andiry Xu
2018-03-10 18:18 ` [RFC v2 62/83] File: getattr and file inode operations Andiry Xu
2018-03-10 18:18 ` [RFC v2 63/83] File operation: llseek Andiry Xu
2018-03-10 18:18 ` [RFC v2 64/83] File operation: open, fsync, flush Andiry Xu
2018-03-10 18:18 ` [RFC v2 65/83] File operation: read Andiry Xu
2018-03-10 18:18 ` [RFC v2 66/83] Super: Add file write item cache Andiry Xu
2018-03-10 18:18 ` [RFC v2 67/83] Dax: commit list of file write items to log Andiry Xu
2018-03-10 18:18 ` [RFC v2 68/83] File operation: copy-on-write write Andiry Xu
2018-03-10 18:18 ` [RFC v2 69/83] Super: Add module param inplace_data_updates Andiry Xu
2018-03-10 18:18 ` [RFC v2 70/83] File operation: Inplace write Andiry Xu
2018-03-10 18:18 ` [RFC v2 71/83] Symlink support Andiry Xu
2018-03-10 18:18 ` [RFC v2 72/83] File operation: fallocate Andiry Xu
2018-03-10 18:18 ` [RFC v2 73/83] Dax: Add iomap operations Andiry Xu
2018-03-10 18:18 ` [RFC v2 74/83] File operation: Mmap Andiry Xu
2018-03-10 18:18 ` [RFC v2 75/83] File operation: read/write iter Andiry Xu
2018-03-10 18:18 ` [RFC v2 76/83] Ioctl support Andiry Xu
2018-03-10 18:18 ` [RFC v2 77/83] GC: Fast garbage collection Andiry Xu
2018-03-10 18:18 ` [RFC v2 78/83] GC: Thorough " Andiry Xu
2018-03-10 18:19 ` [RFC v2 79/83] Normal recovery Andiry Xu
2018-03-10 18:19 ` [RFC v2 80/83] Failure recovery: bitmap operations Andiry Xu
2018-03-10 18:19 ` [RFC v2 81/83] Failure recovery: Inode pages recovery routines Andiry Xu
2018-03-10 18:19 ` [RFC v2 82/83] Failure recovery: Per-CPU recovery Andiry Xu
2018-03-10 18:19 ` [RFC v2 83/83] Sysfs support Andiry Xu
2018-03-15  0:33   ` Randy Dunlap
2018-03-15  6:07     ` Andiry Xu
2018-03-22 15:00   ` David Sterba
2018-03-23  0:31     ` Andiry Xu
2018-03-11  2:14 ` [RFC v2 00/83] NOVA: a new file system for persistent memory Theodore Y. Ts'o
2018-03-11  4:58   ` Andiry Xu

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