From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg0-f66.google.com ([74.125.83.66]:44903 "EHLO mail-pg0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932173AbeCJSUU (ORCPT ); Sat, 10 Mar 2018 13:20:20 -0500 Received: by mail-pg0-f66.google.com with SMTP id l4so4831437pgp.11 for ; Sat, 10 Mar 2018 10:20:20 -0800 (PST) From: Andiry Xu 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 Subject: [RFC v2 04/83] NOVA inode definition. Date: Sat, 10 Mar 2018 10:17:45 -0800 Message-Id: <1520705944-6723-5-git-send-email-jix024@eng.ucsd.edu> In-Reply-To: <1520705944-6723-1-git-send-email-jix024@eng.ucsd.edu> References: <1520705944-6723-1-git-send-email-jix024@eng.ucsd.edu> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: From: Andiry Xu inode.h defines the non-volatile and volatile NOVA inode data structures. The non-volatile NOVA inode (nova_inode) is aligned to 128 bytes and contains file/directory metadata information. The most important fields are log_head and log_tail. log_head points to the start of the log, and log_tail points to the end of the latest committed log entry. NOVA make updates to the inode by appending to the log tail and update the log_tail pointer atomically. The volatile NOVA inode (nova_inode_info) contains necessary information to limit access to the non-volatile NOVA inode during runtime. It has a radix tree to map file offset or filenames to the corresponding log entries. Signed-off-by: Andiry Xu --- fs/nova/inode.h | 187 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 187 insertions(+) create mode 100644 fs/nova/inode.h diff --git a/fs/nova/inode.h b/fs/nova/inode.h new file mode 100644 index 0000000..f9187e3 --- /dev/null +++ b/fs/nova/inode.h @@ -0,0 +1,187 @@ +#ifndef __INODE_H +#define __INODE_H + +struct nova_inode_info_header; +struct nova_inode; + +#include "super.h" + +enum nova_new_inode_type { + TYPE_CREATE = 0, + TYPE_MKNOD, + TYPE_SYMLINK, + TYPE_MKDIR +}; + + +/* + * Structure of an inode in PMEM + * Keep the inode size to within 120 bytes: We use the last eight bytes + * as inode table tail pointer. + */ +struct nova_inode { + + /* first 40 bytes */ + u8 i_rsvd; /* reserved. used to be checksum */ + u8 valid; /* Is this inode valid? */ + u8 deleted; /* Is this inode deleted? */ + u8 i_blk_type; /* data block size this inode uses */ + __le32 i_flags; /* Inode flags */ + __le64 i_size; /* Size of data in bytes */ + __le32 i_ctime; /* Inode modification time */ + __le32 i_mtime; /* Inode b-tree Modification time */ + __le32 i_atime; /* Access time */ + __le16 i_mode; /* File mode */ + __le16 i_links_count; /* Links count */ + + __le64 i_xattr; /* Extended attribute block */ + + /* second 40 bytes */ + __le32 i_uid; /* Owner Uid */ + __le32 i_gid; /* Group Id */ + __le32 i_generation; /* File version (for NFS) */ + __le32 i_create_time; /* Create time */ + __le64 nova_ino; /* nova inode number */ + + __le64 log_head; /* Log head pointer */ + __le64 log_tail; /* Log tail pointer */ + + /* last 40 bytes */ + __le64 create_epoch_id; /* Transaction ID when create */ + __le64 delete_epoch_id; /* Transaction ID when deleted */ + + struct { + __le32 rdev; /* major/minor # */ + } dev; /* device inode */ + + __le32 csum; /* CRC32 checksum */ + + /* Leave 8 bytes for inode table tail pointer */ +} __attribute((__packed__)); + +/* + * NOVA-specific inode state kept in DRAM + */ +struct nova_inode_info_header { + /* For files, tree holds a map from file offsets to + * write log entries. + * + * For directories, tree holds a map from a hash of the file name to + * dentry log entry. + */ + struct radix_tree_root tree; + struct rw_semaphore i_sem; /* Protect log and tree */ + unsigned short i_mode; /* Dir or file? */ + unsigned int i_flags; + unsigned long log_pages; /* Num of log pages */ + unsigned long i_size; + unsigned long i_blocks; + unsigned long ino; + unsigned long pi_addr; + unsigned long valid_entries; /* For thorough GC */ + unsigned long num_entries; /* For thorough GC */ + u64 last_setattr; /* Last setattr entry */ + u64 last_link_change; /* Last link change entry */ + u64 last_dentry; /* Last updated dentry */ + u64 trans_id; /* Transaction ID */ + u64 log_head; /* Log head pointer */ + u64 log_tail; /* Log tail pointer */ + u8 i_blk_type; +}; + +/* + * DRAM state for inodes + */ +struct nova_inode_info { + struct nova_inode_info_header header; + struct inode vfs_inode; +}; + + +static inline struct nova_inode_info *NOVA_I(struct inode *inode) +{ + return container_of(inode, struct nova_inode_info, vfs_inode); +} + +static inline void sih_lock(struct nova_inode_info_header *header) +{ + down_write(&header->i_sem); +} + +static inline void sih_unlock(struct nova_inode_info_header *header) +{ + up_write(&header->i_sem); +} + +static inline void sih_lock_shared(struct nova_inode_info_header *header) +{ + down_read(&header->i_sem); +} + +static inline void sih_unlock_shared(struct nova_inode_info_header *header) +{ + up_read(&header->i_sem); +} + +static inline unsigned int +nova_inode_blk_shift(struct nova_inode_info_header *sih) +{ + return blk_type_to_shift[sih->i_blk_type]; +} + +static inline uint32_t nova_inode_blk_size(struct nova_inode_info_header *sih) +{ + return blk_type_to_size[sih->i_blk_type]; +} + +static inline u64 nova_get_reserved_inode_addr(struct super_block *sb, + u64 inode_number) +{ + return (NOVA_DEF_BLOCK_SIZE_4K * RESERVE_INODE_START) + + inode_number * NOVA_INODE_SIZE; +} + +static inline struct nova_inode *nova_get_reserved_inode(struct super_block *sb, + u64 inode_number) +{ + struct nova_sb_info *sbi = NOVA_SB(sb); + u64 addr; + + addr = nova_get_reserved_inode_addr(sb, inode_number); + + return (struct nova_inode *)(sbi->virt_addr + addr); +} + +static inline struct nova_inode *nova_get_inode_by_ino(struct super_block *sb, + u64 ino) +{ + if (ino == 0 || ino >= NOVA_NORMAL_INODE_START) + return NULL; + + return nova_get_reserved_inode(sb, ino); +} + +static inline struct nova_inode *nova_get_inode(struct super_block *sb, + struct inode *inode) +{ + struct nova_inode_info *si = NOVA_I(inode); + struct nova_inode_info_header *sih = &si->header; + struct nova_inode fake_pi; + void *addr; + int rc; + + addr = nova_get_block(sb, sih->pi_addr); + rc = memcpy_mcsafe(&fake_pi, addr, sizeof(struct nova_inode)); + if (rc) + return NULL; + + return (struct nova_inode *)addr; +} + +static inline int nova_persist_inode(struct nova_inode *pi) +{ + nova_flush_buffer(pi, sizeof(struct nova_inode), 1); + return 0; +} + +#endif -- 2.7.4