From 93f958f9c41f0bfd10627a2279457df64004d957 Mon Sep 17 00:00:00 2001 From: Dave Chinner Date: Tue, 9 Feb 2016 16:54:58 +1100 Subject: [PATCH] xfs: cull unnecessary icdinode fields Now that the struct xfs_icdinode is not directly related to the on-disk format, we can cull things in it we really don't need to store: - magic number never changes - padding is not necessary - next_unlinked is never used - inode number is redundant - uuid is redundant - lsn is accessed directly from dinode - inode CRC is only accessed directly from dinode Hence we can remove these from the struct xfs_icdinode and redirect the code that uses them to the xfs_dinode appripriately. This reduces the size of the struct icdinode from 152 bytes to 88 bytes, and removes a fair chunk of unnecessary code, too. Signed-off-by: Dave Chinner Reviewed-by: Brian Foster Reviewed-by: Christoph Hellwig Signed-off-by: Dave Chinner --- fs/xfs/libxfs/xfs_inode_buf.c | 39 ++++++++++++----------------------- fs/xfs/libxfs/xfs_inode_buf.h | 25 ++++++---------------- fs/xfs/xfs_inode.c | 19 +---------------- fs/xfs/xfs_inode_item.c | 19 ++++++++++------- 4 files changed, 31 insertions(+), 71 deletions(-) diff --git a/fs/xfs/libxfs/xfs_inode_buf.c b/fs/xfs/libxfs/xfs_inode_buf.c index e832bb2ab4f9..c0fe062b567a 100644 --- a/fs/xfs/libxfs/xfs_inode_buf.c +++ b/fs/xfs/libxfs/xfs_inode_buf.c @@ -202,7 +202,6 @@ xfs_inode_from_disk( struct xfs_icdinode *to = &ip->i_d; struct inode *inode = VFS_I(ip); - to->di_magic = be16_to_cpu(from->di_magic); to->di_mode = be16_to_cpu(from->di_mode); to->di_version = from ->di_version; to->di_format = from->di_format; @@ -212,7 +211,6 @@ xfs_inode_from_disk( to->di_nlink = be32_to_cpu(from->di_nlink); to->di_projid_lo = be16_to_cpu(from->di_projid_lo); to->di_projid_hi = be16_to_cpu(from->di_projid_hi); - memcpy(to->di_pad, from->di_pad, sizeof(to->di_pad)); to->di_flushiter = be16_to_cpu(from->di_flushiter); /* @@ -245,24 +243,22 @@ xfs_inode_from_disk( to->di_crtime.t_sec = be32_to_cpu(from->di_crtime.t_sec); to->di_crtime.t_nsec = be32_to_cpu(from->di_crtime.t_nsec); to->di_flags2 = be64_to_cpu(from->di_flags2); - to->di_ino = be64_to_cpu(from->di_ino); - to->di_lsn = be64_to_cpu(from->di_lsn); - memcpy(to->di_pad2, from->di_pad2, sizeof(to->di_pad2)); - uuid_copy(&to->di_uuid, &from->di_uuid); } } void xfs_inode_to_disk( struct xfs_inode *ip, - struct xfs_dinode *to) + struct xfs_dinode *to, + xfs_lsn_t lsn) { struct xfs_icdinode *from = &ip->i_d; struct inode *inode = VFS_I(ip); - to->di_magic = cpu_to_be16(from->di_magic); + to->di_magic = cpu_to_be16(XFS_DINODE_MAGIC); + to->di_mode = cpu_to_be16(from->di_mode); - to->di_version = from ->di_version; + to->di_version = from->di_version; to->di_format = from->di_format; to->di_onlink = cpu_to_be16(from->di_onlink); to->di_uid = cpu_to_be32(from->di_uid); @@ -270,8 +266,8 @@ xfs_inode_to_disk( to->di_nlink = cpu_to_be32(from->di_nlink); to->di_projid_lo = cpu_to_be16(from->di_projid_lo); to->di_projid_hi = cpu_to_be16(from->di_projid_hi); - memcpy(to->di_pad, from->di_pad, sizeof(to->di_pad)); + memset(to->di_pad, 0, sizeof(to->di_pad)); to->di_atime.t_sec = cpu_to_be32(inode->i_atime.tv_sec); to->di_atime.t_nsec = cpu_to_be32(inode->i_atime.tv_nsec); to->di_mtime.t_sec = cpu_to_be32(inode->i_mtime.tv_sec); @@ -296,10 +292,11 @@ xfs_inode_to_disk( to->di_crtime.t_sec = cpu_to_be32(from->di_crtime.t_sec); to->di_crtime.t_nsec = cpu_to_be32(from->di_crtime.t_nsec); to->di_flags2 = cpu_to_be64(from->di_flags2); - to->di_ino = cpu_to_be64(from->di_ino); - to->di_lsn = cpu_to_be64(from->di_lsn); - memcpy(to->di_pad2, from->di_pad2, sizeof(to->di_pad2)); - uuid_copy(&to->di_uuid, &from->di_uuid); + + to->di_ino = cpu_to_be64(ip->i_ino); + to->di_lsn = cpu_to_be64(lsn); + memset(to->di_pad2, 0, sizeof(to->di_pad2)); + uuid_copy(&to->di_uuid, &ip->i_mount->m_sb.sb_meta_uuid); to->di_flushiter = 0; } else { to->di_flushiter = cpu_to_be16(from->di_flushiter); @@ -434,13 +431,10 @@ xfs_iread( !(mp->m_flags & XFS_MOUNT_IKEEP)) { /* initialise the on-disk inode core */ memset(&ip->i_d, 0, sizeof(ip->i_d)); - ip->i_d.di_magic = XFS_DINODE_MAGIC; ip->i_d.di_gen = prandom_u32(); - if (xfs_sb_version_hascrc(&mp->m_sb)) { + if (xfs_sb_version_hascrc(&mp->m_sb)) ip->i_d.di_version = 3; - ip->i_d.di_ino = ip->i_ino; - uuid_copy(&ip->i_d.di_uuid, &mp->m_sb.sb_meta_uuid); - } else + else ip->i_d.di_version = 2; return 0; } @@ -484,16 +478,10 @@ xfs_iread( * Partial initialisation of the in-core inode. Just the bits * that xfs_ialloc won't overwrite or relies on being correct. */ - ip->i_d.di_magic = be16_to_cpu(dip->di_magic); ip->i_d.di_version = dip->di_version; ip->i_d.di_gen = be32_to_cpu(dip->di_gen); ip->i_d.di_flushiter = be16_to_cpu(dip->di_flushiter); - if (dip->di_version == 3) { - ip->i_d.di_ino = be64_to_cpu(dip->di_ino); - uuid_copy(&ip->i_d.di_uuid, &dip->di_uuid); - } - /* * Make sure to pull in the mode here as well in * case the inode is released without being used. @@ -514,7 +502,6 @@ xfs_iread( */ if (ip->i_d.di_version == 1) { ip->i_d.di_version = 2; - memset(&(ip->i_d.di_pad[0]), 0, sizeof(ip->i_d.di_pad)); ip->i_d.di_nlink = ip->i_d.di_onlink; ip->i_d.di_onlink = 0; xfs_set_projid(ip, 0); diff --git a/fs/xfs/libxfs/xfs_inode_buf.h b/fs/xfs/libxfs/xfs_inode_buf.h index adcc9bfe02e9..7b8b1b97918b 100644 --- a/fs/xfs/libxfs/xfs_inode_buf.h +++ b/fs/xfs/libxfs/xfs_inode_buf.h @@ -22,24 +22,22 @@ struct xfs_inode; struct xfs_dinode; /* - * In memory representation of the XFS inode. This is held in the in-core - * struct xfs_inode to represent the on disk values, but no longer needs to be - * identical to the on-disk structure as it is always translated to on-disk + * In memory representation of the XFS inode. This is held in the in-core struct + * xfs_inode and represents the current on disk values but the structure is not + * in on-disk format. That is, this structure is always translated to on-disk * format specific structures at the appropriate time. */ struct xfs_icdinode { - __uint16_t di_magic; /* inode magic # = XFS_DINODE_MAGIC */ __uint16_t di_mode; /* mode and type of file */ __int8_t di_version; /* inode version */ __int8_t di_format; /* format of di_c data */ __uint16_t di_onlink; /* old number of links to file */ + __uint16_t di_flushiter; /* incremented on flush */ __uint32_t di_uid; /* owner's user id */ __uint32_t di_gid; /* owner's group id */ __uint32_t di_nlink; /* number of links to file */ __uint16_t di_projid_lo; /* lower part of owner's project id */ __uint16_t di_projid_hi; /* higher part of owner's project id */ - __uint8_t di_pad[6]; /* unused, zeroed space */ - __uint16_t di_flushiter; /* incremented on flush */ xfs_fsize_t di_size; /* number of bytes in file */ xfs_rfsblock_t di_nblocks; /* # of direct & btree blocks used */ xfs_extlen_t di_extsize; /* basic/minimum extent size for file */ @@ -52,22 +50,10 @@ struct xfs_icdinode { __uint16_t di_flags; /* random flags, XFS_DIFLAG_... */ __uint32_t di_gen; /* generation number */ - /* di_next_unlinked is the only non-core field in the old dinode */ - xfs_agino_t di_next_unlinked;/* agi unlinked list ptr */ - - /* start of the extended dinode, writable fields */ - __uint32_t di_crc; /* CRC of the inode */ __uint64_t di_changecount; /* number of attribute changes */ - xfs_lsn_t di_lsn; /* flush sequence */ __uint64_t di_flags2; /* more random flags */ - __uint8_t di_pad2[16]; /* more padding for future expansion */ - /* fields only written to during inode creation */ xfs_ictimestamp_t di_crtime; /* time created */ - xfs_ino_t di_ino; /* inode number */ - uuid_t di_uuid; /* UUID of the filesystem */ - - /* structure must be padded to 64 bit alignment */ }; /* @@ -86,7 +72,8 @@ int xfs_imap_to_bp(struct xfs_mount *, struct xfs_trans *, int xfs_iread(struct xfs_mount *, struct xfs_trans *, struct xfs_inode *, uint); void xfs_dinode_calc_crc(struct xfs_mount *, struct xfs_dinode *); -void xfs_inode_to_disk(struct xfs_inode *ip, struct xfs_dinode *to); +void xfs_inode_to_disk(struct xfs_inode *ip, struct xfs_dinode *to, + xfs_lsn_t lsn); void xfs_inode_from_disk(struct xfs_inode *ip, struct xfs_dinode *from); void xfs_log_dinode_to_disk(struct xfs_log_dinode *from, struct xfs_dinode *to); diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c index 9ad9e355a1c0..45acdee98983 100644 --- a/fs/xfs/xfs_inode.c +++ b/fs/xfs/xfs_inode.c @@ -809,7 +809,6 @@ xfs_ialloc( ip->i_d.di_uid = xfs_kuid_to_uid(current_fsuid()); ip->i_d.di_gid = xfs_kgid_to_gid(current_fsgid()); xfs_set_projid(ip, prid); - memset(&(ip->i_d.di_pad[0]), 0, sizeof(ip->i_d.di_pad)); if (pip && XFS_INHERIT_GID(pip)) { ip->i_d.di_gid = pip->i_d.di_gid; @@ -847,13 +846,8 @@ xfs_ialloc( ip->i_d.di_flags = 0; if (ip->i_d.di_version == 3) { - ASSERT(ip->i_d.di_ino == ino); - ASSERT(uuid_equal(&ip->i_d.di_uuid, &mp->m_sb.sb_meta_uuid)); - ip->i_d.di_crc = 0; ip->i_d.di_changecount = 1; - ip->i_d.di_lsn = 0; ip->i_d.di_flags2 = 0; - memset(&(ip->i_d.di_pad2[0]), 0, sizeof(ip->i_d.di_pad2)); ip->i_d.di_crtime.t_sec = (__int32_t)tv.tv_sec; ip->i_d.di_crtime.t_nsec = (__int32_t)tv.tv_nsec; } @@ -3464,13 +3458,6 @@ xfs_iflush_int( __func__, ip->i_ino, be16_to_cpu(dip->di_magic), dip); goto corrupt_out; } - if (XFS_TEST_ERROR(ip->i_d.di_magic != XFS_DINODE_MAGIC, - mp, XFS_ERRTAG_IFLUSH_2, XFS_RANDOM_IFLUSH_2)) { - xfs_alert_tag(mp, XFS_PTAG_IFLUSH, - "%s: Bad inode %Lu, ptr 0x%p, magic number 0x%x", - __func__, ip->i_ino, ip, ip->i_d.di_magic); - goto corrupt_out; - } if (S_ISREG(ip->i_d.di_mode)) { if (XFS_TEST_ERROR( (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS) && @@ -3529,7 +3516,7 @@ xfs_iflush_int( * copy out the core of the inode, because if the inode is dirty at all * the core must be. */ - xfs_inode_to_disk(ip, dip); + xfs_inode_to_disk(ip, dip, iip->ili_item.li_lsn); /* Wrap, we never let the log put out DI_MAX_FLUSH */ if (ip->i_d.di_flushiter == DI_MAX_FLUSH) @@ -3581,10 +3568,6 @@ xfs_iflush_int( */ xfs_buf_attach_iodone(bp, xfs_iflush_done, &iip->ili_item); - /* update the lsn in the on disk inode if required */ - if (ip->i_d.di_version == 3) - dip->di_lsn = cpu_to_be64(iip->ili_item.li_lsn); - /* generate the checksum. */ xfs_dinode_calc_crc(mp, dip); diff --git a/fs/xfs/xfs_inode_item.c b/fs/xfs/xfs_inode_item.c index 9dcbf584a336..588d1b4523cb 100644 --- a/fs/xfs/xfs_inode_item.c +++ b/fs/xfs/xfs_inode_item.c @@ -325,12 +325,14 @@ xfs_inode_item_format_attr_fork( static void xfs_inode_to_log_dinode( struct xfs_inode *ip, - struct xfs_log_dinode *to) + struct xfs_log_dinode *to, + xfs_lsn_t lsn) { struct xfs_icdinode *from = &ip->i_d; struct inode *inode = VFS_I(ip); - to->di_magic = from->di_magic; + to->di_magic = XFS_DINODE_MAGIC; + to->di_mode = from->di_mode; to->di_version = from->di_version; to->di_format = from->di_format; @@ -340,8 +342,8 @@ xfs_inode_to_log_dinode( to->di_nlink = from->di_nlink; to->di_projid_lo = from->di_projid_lo; to->di_projid_hi = from->di_projid_hi; - memcpy(to->di_pad, from->di_pad, sizeof(to->di_pad)); + memset(to->di_pad, 0, sizeof(to->di_pad)); to->di_atime.t_sec = inode->i_atime.tv_sec; to->di_atime.t_nsec = inode->i_atime.tv_nsec; to->di_mtime.t_sec = inode->i_mtime.tv_sec; @@ -366,10 +368,11 @@ xfs_inode_to_log_dinode( to->di_crtime.t_sec = from->di_crtime.t_sec; to->di_crtime.t_nsec = from->di_crtime.t_nsec; to->di_flags2 = from->di_flags2; - to->di_ino = from->di_ino; - to->di_lsn = from->di_lsn; - memcpy(to->di_pad2, from->di_pad2, sizeof(to->di_pad2)); - uuid_copy(&to->di_uuid, &from->di_uuid); + + to->di_ino = ip->i_ino; + to->di_lsn = lsn; + memset(to->di_pad2, 0, sizeof(to->di_pad2)); + uuid_copy(&to->di_uuid, &ip->i_mount->m_sb.sb_meta_uuid); to->di_flushiter = 0; } else { to->di_flushiter = from->di_flushiter; @@ -390,7 +393,7 @@ xfs_inode_item_format_core( struct xfs_log_dinode *dic; dic = xlog_prepare_iovec(lv, vecp, XLOG_REG_TYPE_ICORE); - xfs_inode_to_log_dinode(ip, dic); + xfs_inode_to_log_dinode(ip, dic, ip->i_itemp->ili_item.li_lsn); xlog_finish_iovec(lv, *vecp, xfs_log_dinode_size(ip->i_d.di_version)); } -- 2.20.1