From 93848a999cf9b9e4f4f77dba843a48c393f33c59 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Wed, 3 Apr 2013 16:11:17 +1100 Subject: xfs: add version 3 inode format with CRCs Add a new inode version with a larger core. The primary objective is to allow for a crc of the inode, and location information (uuid and ino) to verify it was written in the right place. We also extend it by: a creation time (for Samba); a changecount (for NFSv4); a flush sequence (in LSN format for recovery); an additional inode flags field; and some additional padding. These additional fields are not implemented yet, but already laid out in the structure. [dchinner@redhat.com] Added LSN and flags field, some factoring and rework to capture all the necessary information in the crc calculation. Signed-off-by: Christoph Hellwig Signed-off-by: Dave Chinner Reviewed-by: Ben Myers Signed-off-by: Ben Myers --- fs/xfs/xfs_dinode.h | 33 +++++++++++++++++++++++++++++---- 1 file changed, 29 insertions(+), 4 deletions(-) (limited to 'fs/xfs/xfs_dinode.h') diff --git a/fs/xfs/xfs_dinode.h b/fs/xfs/xfs_dinode.h index 6b5bd1745dbe..f7a0e95d197a 100644 --- a/fs/xfs/xfs_dinode.h +++ b/fs/xfs/xfs_dinode.h @@ -19,7 +19,7 @@ #define __XFS_DINODE_H__ #define XFS_DINODE_MAGIC 0x494e /* 'IN' */ -#define XFS_DINODE_GOOD_VERSION(v) (((v) == 1 || (v) == 2)) +#define XFS_DINODE_GOOD_VERSION(v) ((v) >= 1 && (v) <= 3) typedef struct xfs_timestamp { __be32 t_sec; /* timestamp seconds */ @@ -70,10 +70,35 @@ typedef struct xfs_dinode { /* di_next_unlinked is the only non-core field in the old dinode */ __be32 di_next_unlinked;/* agi unlinked list ptr */ -} __attribute__((packed)) xfs_dinode_t; + + /* start of the extended dinode, writable fields */ + __le32 di_crc; /* CRC of the inode */ + __be64 di_changecount; /* number of attribute changes */ + __be64 di_lsn; /* flush sequence */ + __be64 di_flags2; /* more random flags */ + __u8 di_pad2[16]; /* more padding for future expansion */ + + /* fields only written to during inode creation */ + xfs_timestamp_t di_crtime; /* time created */ + __be64 di_ino; /* inode number */ + uuid_t di_uuid; /* UUID of the filesystem */ + + /* structure must be padded to 64 bit alignment */ +} xfs_dinode_t; #define DI_MAX_FLUSH 0xffff +/* + * Size of the core inode on disk. Version 1 and 2 inodes have + * the same size, but version 3 has grown a few additional fields. + */ +static inline uint xfs_dinode_size(int version) +{ + if (version == 3) + return sizeof(struct xfs_dinode); + return offsetof(struct xfs_dinode, di_crc); +} + /* * The 32 bit link count in the inode theoretically maxes out at UINT_MAX. * Since the pathconf interface is signed, we use 2^31 - 1 instead. @@ -105,7 +130,7 @@ typedef enum xfs_dinode_fmt { * Inode size for given fs. */ #define XFS_LITINO(mp, version) \ - ((int)(((mp)->m_sb.sb_inodesize) - sizeof(struct xfs_dinode))) + ((int)(((mp)->m_sb.sb_inodesize) - xfs_dinode_size(version))) #define XFS_BROOT_SIZE_ADJ(ip) \ (XFS_BMBT_BLOCK_LEN((ip)->i_mount) - sizeof(xfs_bmdr_block_t)) @@ -133,7 +158,7 @@ typedef enum xfs_dinode_fmt { * Return pointers to the data or attribute forks. */ #define XFS_DFORK_DPTR(dip) \ - ((char *)(dip) + sizeof(struct xfs_dinode)) + ((char *)dip + xfs_dinode_size(dip->di_version)) #define XFS_DFORK_APTR(dip) \ (XFS_DFORK_DPTR(dip) + XFS_DFORK_BOFF(dip)) #define XFS_DFORK_PTR(dip,w) \ -- cgit v1.2.3