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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 48/83] Dir: Readdir operation.
Date: Sat, 10 Mar 2018 10:18:29 -0800
Message-ID: <1520705944-6723-49-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 reads the directory by traversing the log and reports
the valid dentries. Valid dentris have inode number greater than zero,
meaning it's a create dentry.

Signed-off-by: Andiry Xu <jix024@cs.ucsd.edu>
---
 fs/nova/dir.c   | 153 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 fs/nova/inode.c |   2 +
 fs/nova/nova.h  |   1 +
 3 files changed, 156 insertions(+)

diff --git a/fs/nova/dir.c b/fs/nova/dir.c
index 377d2da..35a66f9 100644
--- a/fs/nova/dir.c
+++ b/fs/nova/dir.c
@@ -221,3 +221,156 @@ int nova_append_dir_init_entries(struct super_block *sb,
 
 	return 0;
 }
+
+static u64 nova_find_next_dentry_addr(struct super_block *sb,
+	struct nova_inode_info_header *sih, u64 pos)
+{
+	struct nova_sb_info *sbi = NOVA_SB(sb);
+	struct nova_file_write_entry *entry = NULL;
+	struct nova_file_write_entry *entries[1];
+	int nr_entries;
+	u64 addr = 0;
+
+	nr_entries = radix_tree_gang_lookup(&sih->tree,
+					(void **)entries, pos, 1);
+	if (nr_entries == 1) {
+		entry = entries[0];
+		addr = nova_get_addr_off(sbi, entry);
+	}
+
+	return addr;
+}
+
+static int nova_readdir(struct file *file, struct dir_context *ctx)
+{
+	struct inode *inode = file_inode(file);
+	struct super_block *sb = inode->i_sb;
+	struct nova_inode *pidir;
+	struct nova_inode_info *si = NOVA_I(inode);
+	struct nova_inode_info_header *sih = &si->header;
+	struct nova_inode *child_pi;
+	struct nova_inode *prev_child_pi = NULL;
+	struct nova_dentry *entry = NULL;
+	struct nova_dentry *prev_entry = NULL;
+	unsigned short de_len;
+	u64 pi_addr;
+	unsigned long pos = 0;
+	ino_t ino;
+	void *addr;
+	u64 curr_p;
+	u8 type;
+	int ret = 0;
+	timing_t readdir_time;
+
+	NOVA_START_TIMING(readdir_t, readdir_time);
+	pidir = nova_get_inode(sb, inode);
+	nova_dbgv("%s: ino %llu, size %llu, pos 0x%llx\n",
+			__func__, (u64)inode->i_ino,
+			pidir->i_size, ctx->pos);
+
+	if (sih->log_head == 0) {
+		nova_err(sb, "Dir %lu log is NULL!\n", inode->i_ino);
+		ret = -ENOSPC;
+		goto out;
+	}
+
+	pos = ctx->pos;
+
+	if (pos == 0)
+		curr_p = sih->log_head;
+	else if (pos == READDIR_END)
+		goto out;
+	else {
+		curr_p = nova_find_next_dentry_addr(sb, sih, pos);
+		if (curr_p == 0)
+			goto out;
+	}
+
+	while (curr_p != sih->log_tail) {
+		if (goto_next_page(sb, curr_p))
+			curr_p = next_log_page(sb, curr_p);
+
+
+		if (curr_p == 0) {
+			nova_err(sb, "Dir %lu log is NULL!\n", inode->i_ino);
+			ret = -EINVAL;
+			goto out;
+		}
+
+		addr = (void *)nova_get_block(sb, curr_p);
+		type = nova_get_entry_type(addr);
+		switch (type) {
+		case SET_ATTR:
+			curr_p += sizeof(struct nova_setattr_logentry);
+			continue;
+		case LINK_CHANGE:
+			curr_p += sizeof(struct nova_link_change_entry);
+			continue;
+		case DIR_LOG:
+			break;
+		default:
+			nova_err(sb, "%s: unknown type %d, 0x%llx\n",
+				 __func__, type, curr_p);
+			ret = -EINVAL;
+			goto out;
+		}
+
+		entry = (struct nova_dentry *)nova_get_block(sb, curr_p);
+		nova_dbgv("curr_p: 0x%llx, type %d, ino %llu, name %s, namelen %u, rec len %u\n",
+			  curr_p, entry->entry_type, le64_to_cpu(entry->ino),
+			  entry->name, entry->name_len,
+			  le16_to_cpu(entry->de_len));
+
+		de_len = le16_to_cpu(entry->de_len);
+		if (entry->ino > 0 && entry->invalid == 0
+					&& entry->reassigned == 0) {
+			ino = __le64_to_cpu(entry->ino);
+			pos = BKDRHash(entry->name, entry->name_len);
+
+			ret = nova_get_inode_address(sb, ino,
+						     &pi_addr, 0);
+			if (ret) {
+				nova_dbg("%s: get child inode %lu address failed %d\n",
+					 __func__, ino, ret);
+				ctx->pos = READDIR_END;
+				goto out;
+			}
+
+			child_pi = nova_get_block(sb, pi_addr);
+			nova_dbgv("ctx: ino %llu, name %s, name_len %u, de_len %u\n",
+				(u64)ino, entry->name, entry->name_len,
+				entry->de_len);
+			if (prev_entry && !dir_emit(ctx, prev_entry->name,
+				prev_entry->name_len, ino,
+				IF2DT(le16_to_cpu(prev_child_pi->i_mode)))) {
+				nova_dbgv("Here: pos %llu\n", ctx->pos);
+				ret = 0;
+				goto out;
+			}
+			prev_entry = entry;
+
+			prev_child_pi = child_pi;
+		}
+		ctx->pos = pos;
+		curr_p += de_len;
+	}
+
+	if (prev_entry && !dir_emit(ctx, prev_entry->name,
+			prev_entry->name_len, ino,
+			IF2DT(le16_to_cpu(prev_child_pi->i_mode))))
+		return 0;
+
+	ctx->pos = READDIR_END;
+	ret = 0;
+out:
+	NOVA_END_TIMING(readdir_t, readdir_time);
+	nova_dbgv("%s return\n", __func__);
+	return ret;
+}
+
+const struct file_operations nova_dir_operations = {
+	.llseek		= generic_file_llseek,
+	.read		= generic_read_dir,
+	.iterate	= nova_readdir,
+	.fsync		= noop_fsync,
+};
diff --git a/fs/nova/inode.c b/fs/nova/inode.c
index 15517cc..41417e3 100644
--- a/fs/nova/inode.c
+++ b/fs/nova/inode.c
@@ -181,6 +181,7 @@ static int nova_read_inode(struct super_block *sb, struct inode *inode,
 	case S_IFREG:
 		break;
 	case S_IFDIR:
+		inode->i_fop = &nova_dir_operations;
 		break;
 	case S_IFLNK:
 		break;
@@ -625,6 +626,7 @@ struct inode *nova_new_vfs_inode(enum nova_new_inode_type type,
 		inode->i_mapping->a_ops = &nova_aops_dax;
 		break;
 	case TYPE_MKDIR:
+		inode->i_fop = &nova_dir_operations;
 		inode->i_mapping->a_ops = &nova_aops_dax;
 		set_nlink(inode, 2);
 		break;
diff --git a/fs/nova/nova.h b/fs/nova/nova.h
index a94f44d..ed269fe 100644
--- a/fs/nova/nova.h
+++ b/fs/nova/nova.h
@@ -447,6 +447,7 @@ nova_get_blocknr(struct super_block *sb, u64 block, unsigned short btype)
 /* ====================================================== */
 
 /* dir.c */
+extern const struct file_operations nova_dir_operations;
 int nova_insert_dir_radix_tree(struct super_block *sb,
 	struct nova_inode_info_header *sih, const char *name,
 	int namelen, struct nova_dentry *direntry);
-- 
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 ` Andiry Xu [this message]
2018-03-10 18:18 ` [RFC v2 49/83] Dir: Append create/remove dentry Andiry Xu
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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