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linux-next/fs/xfs/xfs_dinode.h
David Chinner 2a82b8be8a [XFS] Concurrent Multi-File Data Streams 
In media spaces, video is often stored in a frame-per-file format. When
dealing with uncompressed realtime HD video streams in this format, it is
crucial that files do not get fragmented and that multiple files a placed
contiguously on disk.

When multiple streams are being ingested and played out at the same time,
it is critical that the filesystem does not cross the streams and
interleave them together as this creates seek and readahead cache miss
latency and prevents both ingest and playout from meeting frame rate
targets.

This patch set creates a "stream of files" concept into the allocator to
place all the data from a single stream contiguously on disk so that RAID
array readahead can be used effectively. Each additional stream gets
placed in different allocation groups within the filesystem, thereby
ensuring that we don't cross any streams. When an AG fills up, we select a
new AG for the stream that is not in use.

The core of the functionality is the stream tracking - each inode that we
create in a directory needs to be associated with the directories' stream.
Hence every time we create a file, we look up the directories' stream
object and associate the new file with that object.

Once we have a stream object for a file, we use the AG that the stream
object point to for allocations. If we can't allocate in that AG (e.g. it
is full) we move the entire stream to another AG. Other inodes in the same
stream are moved to the new AG on their next allocation (i.e. lazy
update).

Stream objects are kept in a cache and hold a reference on the inode.
Hence the inode cannot be reclaimed while there is an outstanding stream
reference. This means that on unlink we need to remove the stream
association and we also need to flush all the associations on certain
events that want to reclaim all unreferenced inodes (e.g. filesystem
freeze).

SGI-PV: 964469
SGI-Modid: xfs-linux-melb:xfs-kern:29096a

Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Barry Naujok <bnaujok@sgi.com>
Signed-off-by: Donald Douwsma <donaldd@sgi.com>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Tim Shimmin <tes@sgi.com>
Signed-off-by: Vlad Apostolov <vapo@sgi.com>
2007-07-14 15:40:53 +10:00

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/*
* Copyright (c) 2000,2002,2005 Silicon Graphics, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef __XFS_DINODE_H__
#define __XFS_DINODE_H__
struct xfs_buf;
struct xfs_mount;
#define XFS_DINODE_VERSION_1 1
#define XFS_DINODE_VERSION_2 2
#define XFS_DINODE_GOOD_VERSION(v) \
(((v) == XFS_DINODE_VERSION_1 || (v) == XFS_DINODE_VERSION_2))
#define XFS_DINODE_MAGIC 0x494e /* 'IN' */
/*
* Disk inode structure.
* This is just the header; the inode is expanded to fill a variable size
* with the last field expanding. It is split into the core and "other"
* because we only need the core part in the in-core inode.
*/
typedef struct xfs_timestamp {
__int32_t t_sec; /* timestamp seconds */
__int32_t t_nsec; /* timestamp nanoseconds */
} xfs_timestamp_t;
/*
* Note: Coordinate changes to this structure with the XFS_DI_* #defines
* below and the offsets table in xfs_ialloc_log_di().
*/
typedef struct xfs_dinode_core
{
__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 */
__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; /* owner's project id */
__uint8_t di_pad[8]; /* unused, zeroed space */
__uint16_t di_flushiter; /* incremented on flush */
xfs_timestamp_t di_atime; /* time last accessed */
xfs_timestamp_t di_mtime; /* time last modified */
xfs_timestamp_t di_ctime; /* time created/inode modified */
xfs_fsize_t di_size; /* number of bytes in file */
xfs_drfsbno_t di_nblocks; /* # of direct & btree blocks used */
xfs_extlen_t di_extsize; /* basic/minimum extent size for file */
xfs_extnum_t di_nextents; /* number of extents in data fork */
xfs_aextnum_t di_anextents; /* number of extents in attribute fork*/
__uint8_t di_forkoff; /* attr fork offs, <<3 for 64b align */
__int8_t di_aformat; /* format of attr fork's data */
__uint32_t di_dmevmask; /* DMIG event mask */
__uint16_t di_dmstate; /* DMIG state info */
__uint16_t di_flags; /* random flags, XFS_DIFLAG_... */
__uint32_t di_gen; /* generation number */
} xfs_dinode_core_t;
#define DI_MAX_FLUSH 0xffff
typedef struct xfs_dinode
{
xfs_dinode_core_t di_core;
/*
* In adding anything between the core and the union, be
* sure to update the macros like XFS_LITINO below and
* XFS_BMAP_RBLOCK_DSIZE in xfs_bmap_btree.h.
*/
xfs_agino_t di_next_unlinked;/* agi unlinked list ptr */
union {
xfs_bmdr_block_t di_bmbt; /* btree root block */
xfs_bmbt_rec_32_t di_bmx[1]; /* extent list */
xfs_dir2_sf_t di_dir2sf; /* shortform directory v2 */
char di_c[1]; /* local contents */
xfs_dev_t di_dev; /* device for S_IFCHR/S_IFBLK */
uuid_t di_muuid; /* mount point value */
char di_symlink[1]; /* local symbolic link */
} di_u;
union {
xfs_bmdr_block_t di_abmbt; /* btree root block */
xfs_bmbt_rec_32_t di_abmx[1]; /* extent list */
xfs_attr_shortform_t di_attrsf; /* shortform attribute list */
} di_a;
} xfs_dinode_t;
/*
* 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.
* The old inode format had a 16 bit link count, so its maximum is USHRT_MAX.
*/
#define XFS_MAXLINK ((1U << 31) - 1U)
#define XFS_MAXLINK_1 65535U
/*
* Bit names for logging disk inodes only
*/
#define XFS_DI_MAGIC 0x0000001
#define XFS_DI_MODE 0x0000002
#define XFS_DI_VERSION 0x0000004
#define XFS_DI_FORMAT 0x0000008
#define XFS_DI_ONLINK 0x0000010
#define XFS_DI_UID 0x0000020
#define XFS_DI_GID 0x0000040
#define XFS_DI_NLINK 0x0000080
#define XFS_DI_PROJID 0x0000100
#define XFS_DI_PAD 0x0000200
#define XFS_DI_ATIME 0x0000400
#define XFS_DI_MTIME 0x0000800
#define XFS_DI_CTIME 0x0001000
#define XFS_DI_SIZE 0x0002000
#define XFS_DI_NBLOCKS 0x0004000
#define XFS_DI_EXTSIZE 0x0008000
#define XFS_DI_NEXTENTS 0x0010000
#define XFS_DI_NAEXTENTS 0x0020000
#define XFS_DI_FORKOFF 0x0040000
#define XFS_DI_AFORMAT 0x0080000
#define XFS_DI_DMEVMASK 0x0100000
#define XFS_DI_DMSTATE 0x0200000
#define XFS_DI_FLAGS 0x0400000
#define XFS_DI_GEN 0x0800000
#define XFS_DI_NEXT_UNLINKED 0x1000000
#define XFS_DI_U 0x2000000
#define XFS_DI_A 0x4000000
#define XFS_DI_NUM_BITS 27
#define XFS_DI_ALL_BITS ((1 << XFS_DI_NUM_BITS) - 1)
#define XFS_DI_CORE_BITS (XFS_DI_ALL_BITS & ~(XFS_DI_U|XFS_DI_A))
/*
* Values for di_format
*/
typedef enum xfs_dinode_fmt
{
XFS_DINODE_FMT_DEV, /* CHR, BLK: di_dev */
XFS_DINODE_FMT_LOCAL, /* DIR, REG: di_c */
/* LNK: di_symlink */
XFS_DINODE_FMT_EXTENTS, /* DIR, REG, LNK: di_bmx */
XFS_DINODE_FMT_BTREE, /* DIR, REG, LNK: di_bmbt */
XFS_DINODE_FMT_UUID /* MNT: di_uuid */
} xfs_dinode_fmt_t;
/*
* Inode minimum and maximum sizes.
*/
#define XFS_DINODE_MIN_LOG 8
#define XFS_DINODE_MAX_LOG 11
#define XFS_DINODE_MIN_SIZE (1 << XFS_DINODE_MIN_LOG)
#define XFS_DINODE_MAX_SIZE (1 << XFS_DINODE_MAX_LOG)
/*
* Inode size for given fs.
*/
#define XFS_LITINO(mp) ((mp)->m_litino)
#define XFS_BROOT_SIZE_ADJ \
(sizeof(xfs_bmbt_block_t) - sizeof(xfs_bmdr_block_t))
/*
* Inode data & attribute fork sizes, per inode.
*/
#define XFS_CFORK_Q(dcp) ((dcp)->di_forkoff != 0)
#define XFS_CFORK_Q_DISK(dcp) ((dcp)->di_forkoff != 0)
#define XFS_CFORK_BOFF(dcp) ((int)((dcp)->di_forkoff << 3))
#define XFS_CFORK_BOFF_DISK(dcp) \
((int)(INT_GET((dcp)->di_forkoff, ARCH_CONVERT) << 3))
#define XFS_CFORK_DSIZE_DISK(dcp,mp) \
(XFS_CFORK_Q_DISK(dcp) ? XFS_CFORK_BOFF_DISK(dcp) : XFS_LITINO(mp))
#define XFS_CFORK_DSIZE(dcp,mp) \
(XFS_CFORK_Q(dcp) ? XFS_CFORK_BOFF(dcp) : XFS_LITINO(mp))
#define XFS_CFORK_ASIZE_DISK(dcp,mp) \
(XFS_CFORK_Q_DISK(dcp) ? XFS_LITINO(mp) - XFS_CFORK_BOFF_DISK(dcp) : 0)
#define XFS_CFORK_ASIZE(dcp,mp) \
(XFS_CFORK_Q(dcp) ? XFS_LITINO(mp) - XFS_CFORK_BOFF(dcp) : 0)
#define XFS_CFORK_SIZE_DISK(dcp,mp,w) \
((w) == XFS_DATA_FORK ? \
XFS_CFORK_DSIZE_DISK(dcp, mp) : \
XFS_CFORK_ASIZE_DISK(dcp, mp))
#define XFS_CFORK_SIZE(dcp,mp,w) \
((w) == XFS_DATA_FORK ? \
XFS_CFORK_DSIZE(dcp, mp) : XFS_CFORK_ASIZE(dcp, mp))
#define XFS_DFORK_DSIZE(dip,mp) \
XFS_CFORK_DSIZE_DISK(&(dip)->di_core, mp)
#define XFS_DFORK_DSIZE_HOST(dip,mp) \
XFS_CFORK_DSIZE(&(dip)->di_core, mp)
#define XFS_DFORK_ASIZE(dip,mp) \
XFS_CFORK_ASIZE_DISK(&(dip)->di_core, mp)
#define XFS_DFORK_ASIZE_HOST(dip,mp) \
XFS_CFORK_ASIZE(&(dip)->di_core, mp)
#define XFS_DFORK_SIZE(dip,mp,w) \
XFS_CFORK_SIZE_DISK(&(dip)->di_core, mp, w)
#define XFS_DFORK_SIZE_HOST(dip,mp,w) \
XFS_CFORK_SIZE(&(dip)->di_core, mp, w)
#define XFS_DFORK_Q(dip) XFS_CFORK_Q_DISK(&(dip)->di_core)
#define XFS_DFORK_BOFF(dip) XFS_CFORK_BOFF_DISK(&(dip)->di_core)
#define XFS_DFORK_DPTR(dip) ((dip)->di_u.di_c)
#define XFS_DFORK_APTR(dip) \
((dip)->di_u.di_c + XFS_DFORK_BOFF(dip))
#define XFS_DFORK_PTR(dip,w) \
((w) == XFS_DATA_FORK ? XFS_DFORK_DPTR(dip) : XFS_DFORK_APTR(dip))
#define XFS_CFORK_FORMAT(dcp,w) \
((w) == XFS_DATA_FORK ? (dcp)->di_format : (dcp)->di_aformat)
#define XFS_CFORK_FMT_SET(dcp,w,n) \
((w) == XFS_DATA_FORK ? \
((dcp)->di_format = (n)) : ((dcp)->di_aformat = (n)))
#define XFS_DFORK_FORMAT(dip,w) XFS_CFORK_FORMAT(&(dip)->di_core, w)
#define XFS_CFORK_NEXTENTS_DISK(dcp,w) \
((w) == XFS_DATA_FORK ? \
INT_GET((dcp)->di_nextents, ARCH_CONVERT) : \
INT_GET((dcp)->di_anextents, ARCH_CONVERT))
#define XFS_CFORK_NEXTENTS(dcp,w) \
((w) == XFS_DATA_FORK ? (dcp)->di_nextents : (dcp)->di_anextents)
#define XFS_DFORK_NEXTENTS(dip,w) XFS_CFORK_NEXTENTS_DISK(&(dip)->di_core, w)
#define XFS_DFORK_NEXTENTS_HOST(dip,w) XFS_CFORK_NEXTENTS(&(dip)->di_core, w)
#define XFS_CFORK_NEXT_SET(dcp,w,n) \
((w) == XFS_DATA_FORK ? \
((dcp)->di_nextents = (n)) : ((dcp)->di_anextents = (n)))
#define XFS_BUF_TO_DINODE(bp) ((xfs_dinode_t *)XFS_BUF_PTR(bp))
/*
* Values for di_flags
* There should be a one-to-one correspondence between these flags and the
* XFS_XFLAG_s.
*/
#define XFS_DIFLAG_REALTIME_BIT 0 /* file's blocks come from rt area */
#define XFS_DIFLAG_PREALLOC_BIT 1 /* file space has been preallocated */
#define XFS_DIFLAG_NEWRTBM_BIT 2 /* for rtbitmap inode, new format */
#define XFS_DIFLAG_IMMUTABLE_BIT 3 /* inode is immutable */
#define XFS_DIFLAG_APPEND_BIT 4 /* inode is append-only */
#define XFS_DIFLAG_SYNC_BIT 5 /* inode is written synchronously */
#define XFS_DIFLAG_NOATIME_BIT 6 /* do not update atime */
#define XFS_DIFLAG_NODUMP_BIT 7 /* do not dump */
#define XFS_DIFLAG_RTINHERIT_BIT 8 /* create with realtime bit set */
#define XFS_DIFLAG_PROJINHERIT_BIT 9 /* create with parents projid */
#define XFS_DIFLAG_NOSYMLINKS_BIT 10 /* disallow symlink creation */
#define XFS_DIFLAG_EXTSIZE_BIT 11 /* inode extent size allocator hint */
#define XFS_DIFLAG_EXTSZINHERIT_BIT 12 /* inherit inode extent size */
#define XFS_DIFLAG_NODEFRAG_BIT 13 /* do not reorganize/defragment */
#define XFS_DIFLAG_FILESTREAM_BIT 14 /* use filestream allocator */
#define XFS_DIFLAG_REALTIME (1 << XFS_DIFLAG_REALTIME_BIT)
#define XFS_DIFLAG_PREALLOC (1 << XFS_DIFLAG_PREALLOC_BIT)
#define XFS_DIFLAG_NEWRTBM (1 << XFS_DIFLAG_NEWRTBM_BIT)
#define XFS_DIFLAG_IMMUTABLE (1 << XFS_DIFLAG_IMMUTABLE_BIT)
#define XFS_DIFLAG_APPEND (1 << XFS_DIFLAG_APPEND_BIT)
#define XFS_DIFLAG_SYNC (1 << XFS_DIFLAG_SYNC_BIT)
#define XFS_DIFLAG_NOATIME (1 << XFS_DIFLAG_NOATIME_BIT)
#define XFS_DIFLAG_NODUMP (1 << XFS_DIFLAG_NODUMP_BIT)
#define XFS_DIFLAG_RTINHERIT (1 << XFS_DIFLAG_RTINHERIT_BIT)
#define XFS_DIFLAG_PROJINHERIT (1 << XFS_DIFLAG_PROJINHERIT_BIT)
#define XFS_DIFLAG_NOSYMLINKS (1 << XFS_DIFLAG_NOSYMLINKS_BIT)
#define XFS_DIFLAG_EXTSIZE (1 << XFS_DIFLAG_EXTSIZE_BIT)
#define XFS_DIFLAG_EXTSZINHERIT (1 << XFS_DIFLAG_EXTSZINHERIT_BIT)
#define XFS_DIFLAG_NODEFRAG (1 << XFS_DIFLAG_NODEFRAG_BIT)
#define XFS_DIFLAG_FILESTREAM (1 << XFS_DIFLAG_FILESTREAM_BIT)
#define XFS_DIFLAG_ANY \
(XFS_DIFLAG_REALTIME | XFS_DIFLAG_PREALLOC | XFS_DIFLAG_NEWRTBM | \
XFS_DIFLAG_IMMUTABLE | XFS_DIFLAG_APPEND | XFS_DIFLAG_SYNC | \
XFS_DIFLAG_NOATIME | XFS_DIFLAG_NODUMP | XFS_DIFLAG_RTINHERIT | \
XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \
XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM)
#endif /* __XFS_DINODE_H__ */
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