2a82b8be8a
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>
106 lines
4.5 KiB
C
106 lines
4.5 KiB
C
/*
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* Copyright (c) 2000-2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __XFS_CLNT_H__
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#define __XFS_CLNT_H__
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/*
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* XFS arguments structure, constructed from the arguments we
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* are passed via the mount system call.
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*
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* NOTE: The mount system call is handled differently between
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* Linux and IRIX. In IRIX we worked work with a binary data
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* structure coming in across the syscall interface from user
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* space (the mount userspace knows about each filesystem type
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* and the set of valid options for it, and converts the users
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* argument string into a binary structure _before_ making the
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* system call), and the ABI issues that this implies.
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*
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* In Linux, we are passed a comma separated set of options;
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* ie. a NULL terminated string of characters. Userspace mount
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* code does not have any knowledge of mount options expected by
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* each filesystem type and so each filesystem parses its mount
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* options in kernel space.
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*
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* For the Linux port, we kept this structure pretty much intact
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* and use it internally (because the existing code groks it).
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*/
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struct xfs_mount_args {
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int flags; /* flags -> see XFSMNT_... macros below */
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int flags2; /* flags -> see XFSMNT2_... macros below */
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int logbufs; /* Number of log buffers, -1 to default */
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int logbufsize; /* Size of log buffers, -1 to default */
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char fsname[MAXNAMELEN+1]; /* data device name */
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char rtname[MAXNAMELEN+1]; /* realtime device filename */
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char logname[MAXNAMELEN+1]; /* journal device filename */
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char mtpt[MAXNAMELEN+1]; /* filesystem mount point */
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int sunit; /* stripe unit (BBs) */
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int swidth; /* stripe width (BBs), multiple of sunit */
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uchar_t iosizelog; /* log2 of the preferred I/O size */
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int ihashsize; /* inode hash table size (buckets) */
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};
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/*
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* XFS mount option flags -- args->flags1
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*/
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#define XFSMNT_ATTR2 0x00000001 /* allow ATTR2 EA format */
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#define XFSMNT_WSYNC 0x00000002 /* safe mode nfs mount
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* compatible */
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#define XFSMNT_INO64 0x00000004 /* move inode numbers up
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* past 2^32 */
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#define XFSMNT_UQUOTA 0x00000008 /* user quota accounting */
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#define XFSMNT_PQUOTA 0x00000010 /* IRIX prj quota accounting */
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#define XFSMNT_UQUOTAENF 0x00000020 /* user quota limit
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* enforcement */
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#define XFSMNT_PQUOTAENF 0x00000040 /* IRIX project quota limit
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* enforcement */
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#define XFSMNT_QUIET 0x00000080 /* don't report mount errors */
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#define XFSMNT_NOALIGN 0x00000200 /* don't allocate at
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* stripe boundaries*/
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#define XFSMNT_RETERR 0x00000400 /* return error to user */
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#define XFSMNT_NORECOVERY 0x00000800 /* no recovery, implies
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* read-only mount */
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#define XFSMNT_SHARED 0x00001000 /* shared XFS mount */
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#define XFSMNT_IOSIZE 0x00002000 /* optimize for I/O size */
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#define XFSMNT_OSYNCISOSYNC 0x00004000 /* o_sync is REALLY o_sync */
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/* (osyncisdsync is default) */
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#define XFSMNT_32BITINODES 0x00200000 /* restrict inodes to 32
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* bits of address space */
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#define XFSMNT_GQUOTA 0x00400000 /* group quota accounting */
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#define XFSMNT_GQUOTAENF 0x00800000 /* group quota limit
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* enforcement */
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#define XFSMNT_NOUUID 0x01000000 /* Ignore fs uuid */
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#define XFSMNT_DMAPI 0x02000000 /* enable dmapi/xdsm */
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#define XFSMNT_BARRIER 0x04000000 /* use write barriers */
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#define XFSMNT_IDELETE 0x08000000 /* inode cluster delete */
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#define XFSMNT_SWALLOC 0x10000000 /* turn on stripe width
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* allocation */
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#define XFSMNT_IHASHSIZE 0x20000000 /* inode hash table size */
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#define XFSMNT_DIRSYNC 0x40000000 /* sync creat,link,unlink,rename
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* symlink,mkdir,rmdir,mknod */
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#define XFSMNT_FLAGS2 0x80000000 /* more flags set in flags2 */
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/*
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* XFS mount option flags -- args->flags2
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*/
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#define XFSMNT2_COMPAT_IOSIZE 0x00000001 /* don't report large preferred
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* I/O size in stat(2) */
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#define XFSMNT2_FILESTREAMS 0x00000002 /* enable the filestreams
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* allocator */
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#endif /* __XFS_CLNT_H__ */
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