From f7ca35227253dc8244fd908140b06010e67a31e5 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 3 Oct 2016 09:11:43 -0700 Subject: xfs: create a separate cow extent size hint for the allocator Create a per-inode extent size allocator hint for copy-on-write. This hint is separate from the existing extent size hint so that CoW can take advantage of the fragmentation-reducing properties of extent size hints without disabling delalloc for regular writes. The extent size hint that's fed to the allocator during a copy on write operation is the greater of the cowextsize and regular extsize hint. During reflink, if we're sharing the entire source file to the entire destination file and the destination file doesn't already have a cowextsize hint, propagate the source file's cowextsize hint to the destination file. Furthermore, zero the bulkstat buffer prior to setting the fields so that we don't copy kernel memory contents into userspace. Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/xfs/libxfs/xfs_bmap.c | 9 ++++-- fs/xfs/libxfs/xfs_format.h | 3 +- fs/xfs/libxfs/xfs_fs.h | 3 +- fs/xfs/libxfs/xfs_inode_buf.c | 4 ++- fs/xfs/libxfs/xfs_inode_buf.h | 1 + fs/xfs/libxfs/xfs_log_format.h | 3 +- fs/xfs/xfs_bmap_util.c | 9 ++++-- fs/xfs/xfs_inode.c | 33 +++++++++++++++++++++ fs/xfs/xfs_inode.h | 1 + fs/xfs/xfs_inode_item.c | 2 +- fs/xfs/xfs_ioctl.c | 67 ++++++++++++++++++++++++++++++++++++++++-- fs/xfs/xfs_iomap.c | 2 +- fs/xfs/xfs_iomap.h | 1 + fs/xfs/xfs_itable.c | 8 ++++- fs/xfs/xfs_reflink.c | 41 +++++++++++++++++++++----- 15 files changed, 167 insertions(+), 20 deletions(-) diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c index e4bf2c406e3b..9702f4c112bf 100644 --- a/fs/xfs/libxfs/xfs_bmap.c +++ b/fs/xfs/libxfs/xfs_bmap.c @@ -3666,7 +3666,9 @@ xfs_bmap_btalloc( else if (mp->m_dalign) stripe_align = mp->m_dalign; - if (xfs_alloc_is_userdata(ap->datatype)) + if (ap->flags & XFS_BMAPI_COWFORK) + align = xfs_get_cowextsz_hint(ap->ip); + else if (xfs_alloc_is_userdata(ap->datatype)) align = xfs_get_extsz_hint(ap->ip); if (unlikely(align)) { error = xfs_bmap_extsize_align(mp, &ap->got, &ap->prev, @@ -4192,7 +4194,10 @@ xfs_bmapi_reserve_delalloc( alen = XFS_FILBLKS_MIN(alen, got->br_startoff - aoff); /* Figure out the extent size, adjust alen */ - extsz = xfs_get_extsz_hint(ip); + if (whichfork == XFS_COW_FORK) + extsz = xfs_get_cowextsz_hint(ip); + else + extsz = xfs_get_extsz_hint(ip); if (extsz) { error = xfs_bmap_extsize_align(mp, got, prev, extsz, rt, eof, 1, 0, &aoff, &alen); diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h index 777fa974a319..5e04ea2aa902 100644 --- a/fs/xfs/libxfs/xfs_format.h +++ b/fs/xfs/libxfs/xfs_format.h @@ -901,7 +901,8 @@ typedef struct xfs_dinode { __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 */ + __be32 di_cowextsize; /* basic cow extent size for file */ + __u8 di_pad2[12]; /* more padding for future expansion */ /* fields only written to during inode creation */ xfs_timestamp_t di_crtime; /* time created */ diff --git a/fs/xfs/libxfs/xfs_fs.h b/fs/xfs/libxfs/xfs_fs.h index 3d1efe5bf37b..b72dc821d78b 100644 --- a/fs/xfs/libxfs/xfs_fs.h +++ b/fs/xfs/libxfs/xfs_fs.h @@ -278,7 +278,8 @@ typedef struct xfs_bstat { #define bs_projid bs_projid_lo /* (previously just bs_projid) */ __u16 bs_forkoff; /* inode fork offset in bytes */ __u16 bs_projid_hi; /* higher part of project id */ - unsigned char bs_pad[10]; /* pad space, unused */ + unsigned char bs_pad[6]; /* pad space, unused */ + __u32 bs_cowextsize; /* cow extent size */ __u32 bs_dmevmask; /* DMIG event mask */ __u16 bs_dmstate; /* DMIG state info */ __u16 bs_aextents; /* attribute number of extents */ diff --git a/fs/xfs/libxfs/xfs_inode_buf.c b/fs/xfs/libxfs/xfs_inode_buf.c index 4b9769e23c83..a3e803823a19 100644 --- a/fs/xfs/libxfs/xfs_inode_buf.c +++ b/fs/xfs/libxfs/xfs_inode_buf.c @@ -256,6 +256,7 @@ 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_cowextsize = be32_to_cpu(from->di_cowextsize); } } @@ -305,7 +306,7 @@ 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_cowextsize = cpu_to_be32(from->di_cowextsize); 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)); @@ -357,6 +358,7 @@ xfs_log_dinode_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_cowextsize = cpu_to_be32(from->di_cowextsize); 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)); diff --git a/fs/xfs/libxfs/xfs_inode_buf.h b/fs/xfs/libxfs/xfs_inode_buf.h index 7c4dd321b215..62d9d4681c8c 100644 --- a/fs/xfs/libxfs/xfs_inode_buf.h +++ b/fs/xfs/libxfs/xfs_inode_buf.h @@ -47,6 +47,7 @@ struct xfs_icdinode { __uint16_t di_flags; /* random flags, XFS_DIFLAG_... */ __uint64_t di_flags2; /* more random flags */ + __uint32_t di_cowextsize; /* basic cow extent size for file */ xfs_ictimestamp_t di_crtime; /* time created */ }; diff --git a/fs/xfs/libxfs/xfs_log_format.h b/fs/xfs/libxfs/xfs_log_format.h index 5dd7c2e8f439..364ce6fcc213 100644 --- a/fs/xfs/libxfs/xfs_log_format.h +++ b/fs/xfs/libxfs/xfs_log_format.h @@ -423,7 +423,8 @@ struct xfs_log_dinode { __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 */ + __uint32_t di_cowextsize; /* basic cow extent size for file */ + __uint8_t di_pad2[12]; /* more padding for future expansion */ /* fields only written to during inode creation */ xfs_ictimestamp_t di_crtime; /* time created */ diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c index e2f46e645612..4a807f05e460 100644 --- a/fs/xfs/xfs_bmap_util.c +++ b/fs/xfs/xfs_bmap_util.c @@ -582,8 +582,13 @@ xfs_getbmap( if (ip->i_cformat != XFS_DINODE_FMT_EXTENTS) return -EINVAL; - prealloced = 0; - fixlen = XFS_ISIZE(ip); + if (xfs_get_cowextsz_hint(ip)) { + prealloced = 1; + fixlen = mp->m_super->s_maxbytes; + } else { + prealloced = 0; + fixlen = XFS_ISIZE(ip); + } break; default: if (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS && diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c index f072f48b3c04..09640bdd3e44 100644 --- a/fs/xfs/xfs_inode.c +++ b/fs/xfs/xfs_inode.c @@ -77,6 +77,27 @@ xfs_get_extsz_hint( return 0; } +/* + * Helper function to extract CoW extent size hint from inode. + * Between the extent size hint and the CoW extent size hint, we + * return the greater of the two. + */ +xfs_extlen_t +xfs_get_cowextsz_hint( + struct xfs_inode *ip) +{ + xfs_extlen_t a, b; + + a = 0; + if (ip->i_d.di_flags2 & XFS_DIFLAG2_COWEXTSIZE) + a = ip->i_d.di_cowextsize; + b = xfs_get_extsz_hint(ip); + + if (a > b) + return a; + return b; +} + /* * These two are wrapper routines around the xfs_ilock() routine used to * centralize some grungy code. They are used in places that wish to lock the @@ -652,6 +673,8 @@ _xfs_dic2xflags( if (di_flags2 & XFS_DIFLAG2_ANY) { if (di_flags2 & XFS_DIFLAG2_DAX) flags |= FS_XFLAG_DAX; + if (di_flags2 & XFS_DIFLAG2_COWEXTSIZE) + flags |= FS_XFLAG_COWEXTSIZE; } if (has_attr) @@ -835,6 +858,7 @@ xfs_ialloc( if (ip->i_d.di_version == 3) { inode->i_version = 1; ip->i_d.di_flags2 = 0; + ip->i_d.di_cowextsize = 0; ip->i_d.di_crtime.t_sec = (__int32_t)tv.tv_sec; ip->i_d.di_crtime.t_nsec = (__int32_t)tv.tv_nsec; } @@ -897,6 +921,15 @@ xfs_ialloc( ip->i_d.di_flags |= di_flags; ip->i_d.di_flags2 |= di_flags2; } + if (pip && + (pip->i_d.di_flags2 & XFS_DIFLAG2_ANY) && + pip->i_d.di_version == 3 && + ip->i_d.di_version == 3) { + if (pip->i_d.di_flags2 & XFS_DIFLAG2_COWEXTSIZE) { + ip->i_d.di_flags2 |= XFS_DIFLAG2_COWEXTSIZE; + ip->i_d.di_cowextsize = pip->i_d.di_cowextsize; + } + } /* FALLTHROUGH */ case S_IFLNK: ip->i_d.di_format = XFS_DINODE_FMT_EXTENTS; diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h index ff6fc03c0092..6d63dc031127 100644 --- a/fs/xfs/xfs_inode.h +++ b/fs/xfs/xfs_inode.h @@ -426,6 +426,7 @@ int xfs_iflush(struct xfs_inode *, struct xfs_buf **); void xfs_lock_two_inodes(xfs_inode_t *, xfs_inode_t *, uint); xfs_extlen_t xfs_get_extsz_hint(struct xfs_inode *ip); +xfs_extlen_t xfs_get_cowextsz_hint(struct xfs_inode *ip); int xfs_dir_ialloc(struct xfs_trans **, struct xfs_inode *, umode_t, xfs_nlink_t, xfs_dev_t, prid_t, int, diff --git a/fs/xfs/xfs_inode_item.c b/fs/xfs/xfs_inode_item.c index 892c2aced207..9610e9c00952 100644 --- a/fs/xfs/xfs_inode_item.c +++ b/fs/xfs/xfs_inode_item.c @@ -368,7 +368,7 @@ 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_cowextsize = from->di_cowextsize; to->di_ino = ip->i_ino; to->di_lsn = lsn; memset(to->di_pad2, 0, sizeof(to->di_pad2)); diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c index 96a70fd1f5d6..1388a1275dc8 100644 --- a/fs/xfs/xfs_ioctl.c +++ b/fs/xfs/xfs_ioctl.c @@ -903,6 +903,8 @@ xfs_ioc_fsgetxattr( xfs_ilock(ip, XFS_ILOCK_SHARED); fa.fsx_xflags = xfs_ip2xflags(ip); fa.fsx_extsize = ip->i_d.di_extsize << ip->i_mount->m_sb.sb_blocklog; + fa.fsx_cowextsize = ip->i_d.di_cowextsize << + ip->i_mount->m_sb.sb_blocklog; fa.fsx_projid = xfs_get_projid(ip); if (attr) { @@ -973,12 +975,13 @@ xfs_set_diflags( if (ip->i_d.di_version < 3) return; - di_flags2 = 0; + di_flags2 = (ip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK); if (xflags & FS_XFLAG_DAX) di_flags2 |= XFS_DIFLAG2_DAX; + if (xflags & FS_XFLAG_COWEXTSIZE) + di_flags2 |= XFS_DIFLAG2_COWEXTSIZE; ip->i_d.di_flags2 = di_flags2; - } STATIC void @@ -1219,6 +1222,56 @@ xfs_ioctl_setattr_check_extsize( return 0; } +/* + * CoW extent size hint validation rules are: + * + * 1. CoW extent size hint can only be set if reflink is enabled on the fs. + * The inode does not have to have any shared blocks, but it must be a v3. + * 2. FS_XFLAG_COWEXTSIZE is only valid for directories and regular files; + * for a directory, the hint is propagated to new files. + * 3. Can be changed on files & directories at any time. + * 4. CoW extsize hint of 0 turns off hints, clears inode flags. + * 5. Extent size must be a multiple of the appropriate block size. + * 6. The extent size hint must be limited to half the AG size to avoid + * alignment extending the extent beyond the limits of the AG. + */ +static int +xfs_ioctl_setattr_check_cowextsize( + struct xfs_inode *ip, + struct fsxattr *fa) +{ + struct xfs_mount *mp = ip->i_mount; + + if (!(fa->fsx_xflags & FS_XFLAG_COWEXTSIZE)) + return 0; + + if (!xfs_sb_version_hasreflink(&ip->i_mount->m_sb) || + ip->i_d.di_version != 3) + return -EINVAL; + + if (!S_ISREG(VFS_I(ip)->i_mode) && !S_ISDIR(VFS_I(ip)->i_mode)) + return -EINVAL; + + if (fa->fsx_cowextsize != 0) { + xfs_extlen_t size; + xfs_fsblock_t cowextsize_fsb; + + cowextsize_fsb = XFS_B_TO_FSB(mp, fa->fsx_cowextsize); + if (cowextsize_fsb > MAXEXTLEN) + return -EINVAL; + + size = mp->m_sb.sb_blocksize; + if (cowextsize_fsb > mp->m_sb.sb_agblocks / 2) + return -EINVAL; + + if (fa->fsx_cowextsize % size) + return -EINVAL; + } else + fa->fsx_xflags &= ~FS_XFLAG_COWEXTSIZE; + + return 0; +} + static int xfs_ioctl_setattr_check_projid( struct xfs_inode *ip, @@ -1311,6 +1364,10 @@ xfs_ioctl_setattr( if (code) goto error_trans_cancel; + code = xfs_ioctl_setattr_check_cowextsize(ip, fa); + if (code) + goto error_trans_cancel; + code = xfs_ioctl_setattr_xflags(tp, ip, fa); if (code) goto error_trans_cancel; @@ -1346,6 +1403,12 @@ xfs_ioctl_setattr( ip->i_d.di_extsize = fa->fsx_extsize >> mp->m_sb.sb_blocklog; else ip->i_d.di_extsize = 0; + if (ip->i_d.di_version == 3 && + (ip->i_d.di_flags2 & XFS_DIFLAG2_COWEXTSIZE)) + ip->i_d.di_cowextsize = fa->fsx_cowextsize >> + mp->m_sb.sb_blocklog; + else + ip->i_d.di_cowextsize = 0; code = xfs_trans_commit(tp); diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index 765849ed9b70..d907eb9f8ef3 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -71,7 +71,7 @@ xfs_bmbt_to_iomap( iomap->bdev = xfs_find_bdev_for_inode(VFS_I(ip)); } -static xfs_extlen_t +xfs_extlen_t xfs_eof_alignment( struct xfs_inode *ip, xfs_extlen_t extsize) diff --git a/fs/xfs/xfs_iomap.h b/fs/xfs/xfs_iomap.h index a16b9567e76b..6d45cf01fcff 100644 --- a/fs/xfs/xfs_iomap.h +++ b/fs/xfs/xfs_iomap.h @@ -31,6 +31,7 @@ int xfs_iomap_write_unwritten(struct xfs_inode *, xfs_off_t, xfs_off_t); void xfs_bmbt_to_iomap(struct xfs_inode *, struct iomap *, struct xfs_bmbt_irec *); +xfs_extlen_t xfs_eof_alignment(struct xfs_inode *ip, xfs_extlen_t extsize); extern struct iomap_ops xfs_iomap_ops; extern struct iomap_ops xfs_xattr_iomap_ops; diff --git a/fs/xfs/xfs_itable.c b/fs/xfs/xfs_itable.c index ce73eb34620d..66e881790c17 100644 --- a/fs/xfs/xfs_itable.c +++ b/fs/xfs/xfs_itable.c @@ -66,7 +66,7 @@ xfs_bulkstat_one_int( if (!buffer || xfs_internal_inum(mp, ino)) return -EINVAL; - buf = kmem_alloc(sizeof(*buf), KM_SLEEP | KM_MAYFAIL); + buf = kmem_zalloc(sizeof(*buf), KM_SLEEP | KM_MAYFAIL); if (!buf) return -ENOMEM; @@ -111,6 +111,12 @@ xfs_bulkstat_one_int( buf->bs_aextents = dic->di_anextents; buf->bs_forkoff = XFS_IFORK_BOFF(ip); + if (dic->di_version == 3) { + if (dic->di_flags2 & XFS_DIFLAG2_COWEXTSIZE) + buf->bs_cowextsize = dic->di_cowextsize << + mp->m_sb.sb_blocklog; + } + switch (dic->di_format) { case XFS_DINODE_FMT_DEV: buf->bs_rdev = ip->i_df.if_u2.if_rdev; diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index d4707e627a74..8e894118295f 100644 --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -238,6 +238,7 @@ __xfs_reflink_reserve_cow( int nimaps, eof = 0, error = 0; bool shared = false, trimmed = false; xfs_extnum_t idx; + xfs_extlen_t align; /* Already reserved? Skip the refcount btree access. */ xfs_bmap_search_extents(ip, *offset_fsb, XFS_COW_FORK, &eof, &idx, @@ -277,6 +278,10 @@ __xfs_reflink_reserve_cow( if (error) goto out_unlock; + align = xfs_eof_alignment(ip, xfs_get_cowextsz_hint(ip)); + if (align) + end_fsb = roundup_64(end_fsb, align); + retry: error = xfs_bmapi_reserve_delalloc(ip, XFS_COW_FORK, *offset_fsb, end_fsb - *offset_fsb, &got, @@ -927,18 +932,19 @@ out_error: } /* - * Update destination inode size, if necessary. + * Update destination inode size & cowextsize hint, if necessary. */ STATIC int xfs_reflink_update_dest( struct xfs_inode *dest, - xfs_off_t newlen) + xfs_off_t newlen, + xfs_extlen_t cowextsize) { struct xfs_mount *mp = dest->i_mount; struct xfs_trans *tp; int error; - if (newlen <= i_size_read(VFS_I(dest))) + if (newlen <= i_size_read(VFS_I(dest)) && cowextsize == 0) return 0; error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp); @@ -948,9 +954,17 @@ xfs_reflink_update_dest( xfs_ilock(dest, XFS_ILOCK_EXCL); xfs_trans_ijoin(tp, dest, XFS_ILOCK_EXCL); - trace_xfs_reflink_update_inode_size(dest, newlen); - i_size_write(VFS_I(dest), newlen); - dest->i_d.di_size = newlen; + if (newlen > i_size_read(VFS_I(dest))) { + trace_xfs_reflink_update_inode_size(dest, newlen); + i_size_write(VFS_I(dest), newlen); + dest->i_d.di_size = newlen; + } + + if (cowextsize) { + dest->i_d.di_cowextsize = cowextsize; + dest->i_d.di_flags2 |= XFS_DIFLAG2_COWEXTSIZE; + } + xfs_trans_log_inode(tp, dest, XFS_ILOG_CORE); error = xfs_trans_commit(tp); @@ -1270,6 +1284,7 @@ xfs_reflink_remap_range( xfs_fileoff_t sfsbno, dfsbno; xfs_filblks_t fsblen; int error; + xfs_extlen_t cowextsize; bool is_same; if (!xfs_sb_version_hasreflink(&mp->m_sb)) @@ -1330,7 +1345,19 @@ xfs_reflink_remap_range( if (error) goto out_error; - error = xfs_reflink_update_dest(dest, destoff + len); + /* + * Carry the cowextsize hint from src to dest if we're sharing the + * entire source file to the entire destination file, the source file + * has a cowextsize hint, and the destination file does not. + */ + cowextsize = 0; + if (srcoff == 0 && len == i_size_read(VFS_I(src)) && + (src->i_d.di_flags2 & XFS_DIFLAG2_COWEXTSIZE) && + destoff == 0 && len >= i_size_read(VFS_I(dest)) && + !(dest->i_d.di_flags2 & XFS_DIFLAG2_COWEXTSIZE)) + cowextsize = src->i_d.di_cowextsize; + + error = xfs_reflink_update_dest(dest, destoff + len, cowextsize); if (error) goto out_error; -- cgit v1.2.1