- 22 6月, 2015 2 次提交
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由 Dave Chinner 提交于
We no longer calculate the minimum freelist size from the on-disk AGF, so we don't need the macros used for this. That means the nested macros can be cleaned up, and turn this into an actual function so the logic is clear and concise. This will make it much easier to add support for the rmap btree when the time comes. This also gets rid of the XFS_AG_MAXLEVELS macro used by these freelist macros as it is simply a wrapper around a single variable. Signed-off-by: NDave Chinner <dchinner@redhat.com> Reviewed-by: NBrian Foster <bfoster@redhat.com> Signed-off-by: NDave Chinner <david@fromorbit.com>
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由 Dave Chinner 提交于
At the moment, xfs_alloc_fix_freelist() uses a mix of per-ag based access and agf buffer based access to freelist and space usage information. However, once the AGF buffer is locked inside this function, it is guaranteed that both the in-memory and on-disk values are identical. xfs_alloc_fix_freelist() doesn't modify the values in the structures directly, so it is a read-only user of the infomration, and hence can use the per-ag structure exclusively for determining what it should do. This opens up an avenue for cleaning up a lot of duplicated logic whose only difference is the structure it gets the data from, and in doing so removes a lot of needless byte swapping overhead when fixing up the free list. Signed-off-by: NDave Chinner <dchinner@redhat.com> Reviewed-by: NBrian Foster <bfoster@redhat.com> Signed-off-by: NDave Chinner <david@fromorbit.com>
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- 16 4月, 2015 1 次提交
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由 David Howells 提交于
that's the bulk of filesystem drivers dealing with inodes of their own Signed-off-by: NDavid Howells <dhowells@redhat.com> Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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- 25 3月, 2015 1 次提交
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由 Eric Sandeen 提交于
If xfs_filestream_get_parent() fails, we have a null pip, goto out, and attempt to IRELE(NULL). This causes a null pointer dereference and BUG(). Fix this by directly returning NULLAGNUMBER in this case. Reported-by: NAdrien Nader <adrien@notk.org> Signed-off-by: NEric Sandeen <sandeen@redhat.com> Reviewed-by: NDave Chinner <dchinner@redhat.com> Signed-off-by: NDave Chinner <david@fromorbit.com>
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- 28 11月, 2014 3 次提交
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由 Christoph Hellwig 提交于
Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NDave Chinner <dchinner@redhat.com> Signed-off-by: NDave Chinner <david@fromorbit.com>
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由 Christoph Hellwig 提交于
More on-disk format consolidation. A few declarations that weren't on-disk format related move into better suitable spots. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NDave Chinner <dchinner@redhat.com> Signed-off-by: NDave Chinner <david@fromorbit.com>
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由 Christoph Hellwig 提交于
More consolidatation for the on-disk format defintions. Note that the XFS_IS_REALTIME_INODE moves to xfs_linux.h instead as it is not related to the on disk format, but depends on a CONFIG_ option. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NDave Chinner <dchinner@redhat.com> Signed-off-by: NDave Chinner <david@fromorbit.com>
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- 25 6月, 2014 1 次提交
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由 Dave Chinner 提交于
Convert all the errors the core XFs code to negative error signs like the rest of the kernel and remove all the sign conversion we do in the interface layers. Errors for conversion (and comparison) found via searches like: $ git grep " E" fs/xfs $ git grep "return E" fs/xfs $ git grep " E[A-Z].*;$" fs/xfs Negation points found via searches like: $ git grep "= -[a-z,A-Z]" fs/xfs $ git grep "return -[a-z,A-D,F-Z]" fs/xfs $ git grep " -[a-z].*;" fs/xfs [ with some bits I missed from Brian Foster ] Signed-off-by: NDave Chinner <dchinner@redhat.com> Reviewed-by: NBrian Foster <bfoster@redhat.com> Signed-off-by: NDave Chinner <david@fromorbit.com>
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- 23 4月, 2014 6 次提交
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由 Christoph Hellwig 提交于
Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NDave Chinner <dchinner@redhat.com> Signed-off-by: NDave Chinner <david@fromorbit.com>
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由 Christoph Hellwig 提交于
There is no good reason to create a filestream when a directory entry is created. Delay it until the first allocation happens to simply the code and reduce the amount of mru cache lookups we do. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NDave Chinner <dchinner@redhat.com> Signed-off-by: NDave Chinner <david@fromorbit.com>
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由 Christoph Hellwig 提交于
We only have very few of these around, and allocation isn't that much of a hot path. Remove the slab cache to simplify the code, and to not waste any resources for the usual case of not having any inodes that use the filestream allocator. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NDave Chinner <dchinner@redhat.com> Signed-off-by: NDave Chinner <david@fromorbit.com>
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由 Christoph Hellwig 提交于
In Linux we will always be able to find a parent inode for file that are undergoing I/O. Use this to simply the file stream allocator by only keeping track of parent inodes. Signed-off-by: NChristoph Hellwig <hch@lst.de>
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由 Christoph Hellwig 提交于
We never test the flag except in xfs_inode_is_filestream, but that function already tests the on-disk flag or filesystem wide flags, and is used to decide if we want to set XFS_IFILESTREAM in the first place. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NDave Chinner <dchinner@redhat.com> Signed-off-by: NDave Chinner <david@fromorbit.com>
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由 Christoph Hellwig 提交于
There is no need to do a separate allocation for each mru element, just embedd the structure into the parent one in the user. Besides saving a memory allocation and the infrastructure required for it this also simplifies the API. While we do major surgery on xfs_mru_cache.c also de-typedef it and make struct mru_cache private to the implementation file. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NDave Chinner <dchinner@redhat.com> Signed-off-by: NDave Chinner <david@fromorbit.com>
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- 24 10月, 2013 2 次提交
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由 Dave Chinner 提交于
Currently the xfs_inode.h header has a dependency on the definition of the BMAP btree records as the inode fork includes an array of xfs_bmbt_rec_host_t objects in it's definition. Move all the btree format definitions from xfs_btree.h, xfs_bmap_btree.h, xfs_alloc_btree.h and xfs_ialloc_btree.h to xfs_format.h to continue the process of centralising the on-disk format definitions. With this done, the xfs inode definitions are no longer dependent on btree header files. The enables a massive culling of unnecessary includes, with close to 200 #include directives removed from the XFS kernel code base. Signed-off-by: NDave Chinner <dchinner@redhat.com> Reviewed-by: NBen Myers <bpm@sgi.com> Signed-off-by: NBen Myers <bpm@sgi.com>
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由 Dave Chinner 提交于
xfs_trans.h has a dependency on xfs_log.h for a couple of structures. Most code that does transactions doesn't need to know anything about the log, but this dependency means that they have to include xfs_log.h. Decouple the xfs_trans.h and xfs_log.h header files and clean up the includes to be in dependency order. In doing this, remove the direct include of xfs_trans_reserve.h from xfs_trans.h so that we remove the dependency between xfs_trans.h and xfs_mount.h. Hence the xfs_trans.h include can be moved to the indicate the actual dependencies other header files have on it. Note that these are kernel only header files, so this does not translate to any userspace changes at all. Signed-off-by: NDave Chinner <dchinner@redhat.com> Reviewed-by: NBen Myers <bpm@sgi.com> Signed-off-by: NBen Myers <bpm@sgi.com>
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- 13 8月, 2013 3 次提交
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由 Dave Chinner 提交于
There are a few small helper functions in xfs_util, all related to xfs_inode modifications. Move them all to xfs_inode.c so all xfs_inode operations are consiolidated in the one place. Signed-off-by: NDave Chinner <dchinner@redhat.com> Reviewed-by: NMark Tinguely <tinguely@sgi.com> Signed-off-by: NBen Myers <bpm@sgi.com>
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由 Dave Chinner 提交于
There is a bunch of code in xfs_bmap.c that is kernel specific and not shared with userspace. To minimise the difference between the kernel and userspace code, shift this unshared code to xfs_bmap_util.c, and the declarations to xfs_bmap_util.h. The biggest issue here is xfs_bmap_finish() - userspace has it's own definition of this function, and so we need to move it out of xfs_bmap.[ch]. This means several other files need to include xfs_bmap_util.h as well. It also introduces and interesting dance for the stack switching code in xfs_bmapi_allocate(). The stack switching/workqueue code is actually moved to xfs_bmap_util.c, so that userspace can simply use a #define in a header file to connect the dots without needing to know about the stack switch code at all. Signed-off-by: NDave Chinner <dchinner@redhat.com> Reviewed-by: NMark Tinguely <tinguely@sgi.com> Signed-off-by: NBen Myers <bpm@sgi.com>
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由 Dave Chinner 提交于
The log item format definitions are shared with userspace. Split them out of header files that contain kernel only defintions to make it simple to shared them. Signed-off-by: NDave Chinner <dchinner@redhat.com> Reviewed-by: NBrian Foster <bfoster@redhat.com> Reviewed-by: NMark Tinguely <tinguely@sgi.com> Signed-off-by: NBen Myers <bpm@sgi.com>
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- 12 10月, 2011 2 次提交
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由 Dave Chinner 提交于
Signed-off-by: NDave Chinner <dchinner@redhat.com> Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NAlex Elder <aelder@sgi.com>
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由 Dave Chinner 提交于
Rather than passing the firstblock and freelist structure around, embed it into the bmalloca structure and remove it from the function parameters. This also enables the minleft parameter to be set only once in xfs_bmapi_write(), and the freelist cursor directly queried in xfs_bmapi_allocate to clear it when the lowspace algorithm is activated. Signed-off-by: NDave Chinner <dchinner@redhat.com> Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NAlex Elder <aelder@sgi.com>
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- 27 7月, 2011 2 次提交
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由 Al Viro 提交于
mode_t is not a bitmap... Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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由 Al Viro 提交于
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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- 11 11月, 2010 1 次提交
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由 Christoph Hellwig 提交于
The filestreams code may take the iolock on the parent inode while holding it on a child. This is the only place in XFS where we take both the child and parent iolock, so just telling lockdep about it is enough. The lock flag required for that was already added as part of the ilock lockdep annotations and unused so far. Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NAlex Elder <aelder@sgi.com>
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- 27 7月, 2010 3 次提交
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由 Christoph Hellwig 提交于
Move xfs_filestream_peek_ag, xxfs_filestream_get_ag and xfs_filestream_put_ag from xfs_filestream.h to xfs_filestream.c where it's only callers are, and remove the inline marker while we're at it to let the compiler decide on the inlining. Also don't return a value from xfs_filestream_put_ag because we don't need it. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NDave Chinner <dchinner@redhat.com> Signed-off-by: NDave Chinner <david@fromorbit.com>
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由 Christoph Hellwig 提交于
Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NDave Chinner <david@fromorbit.com>
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由 Christoph Hellwig 提交于
Dmapi support was never merged upstream, but we still have a lot of hooks bloating XFS for it, all over the fast pathes of the filesystem. This patch drops over 700 lines of dmapi overhead. If we'll ever get HSM support in mainline at least the namespace events can be done much saner in the VFS instead of the individual filesystem, so it's not like this is much help for future work. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NDave Chinner <dchinner@redhat.com>
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- 16 1月, 2010 3 次提交
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由 Dave Chinner 提交于
The filestreams cache flush is not needed in the sync code as it does not affect data writeback, and it is now not used by the growfs code, either, so kill it. Signed-off-by: NDave Chinner <david@fromorbit.com> Reviewed-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NAlex Elder <aelder@sgi.com>
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由 Dave Chinner 提交于
The use of an array for the per-ag structures requires reallocation of the array when growing the filesystem. This requires locking access to the array to avoid use after free situations, and the locking is difficult to get right. To avoid needing to reallocate an array, change the per-ag structures to an allocated object per ag and index them using a tree structure. The AGs are always densely indexed (hence the use of an array), but the number supported is 2^32 and lookups tend to be random and hence indexing needs to scale. A simple choice is a radix tree - it works well with this sort of index. This change also removes another large contiguous allocation from the mount/growfs path in XFS. The growing process now needs to change to only initialise the new AGs required for the extra space, and as such only needs to exclusively lock the tree for inserts. The rest of the code only needs to lock the tree while doing lookups, and hence this will remove all the deadlocks that currently occur on the m_perag_lock as it is now an innermost lock. The lock is also changed to a spinlock from a read/write lock as the hold time is now extremely short. To complete the picture, the per-ag structures will need to be reference counted to ensure that we don't free/modify them while they are still in use. This will be done in subsequent patch. Signed-off-by: NDave Chinner <david@fromorbit.com> Reviewed-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NAlex Elder <aelder@sgi.com>
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由 Dave Chinner 提交于
Use xfs_perag_get() and xfs_perag_put() in the filestreams code. Signed-off-by: NDave Chinner <david@fromorbit.com> Reviewed-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NAlex Elder <aelder@sgi.com>
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- 15 12月, 2009 1 次提交
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由 Christoph Hellwig 提交于
Convert the old xfs tracing support that could only be used with the out of tree kdb and xfsidbg patches to use the generic event tracer. To use it make sure CONFIG_EVENT_TRACING is enabled and then enable all xfs trace channels by: echo 1 > /sys/kernel/debug/tracing/events/xfs/enable or alternatively enable single events by just doing the same in one event subdirectory, e.g. echo 1 > /sys/kernel/debug/tracing/events/xfs/xfs_ihold/enable or set more complex filters, etc. In Documentation/trace/events.txt all this is desctribed in more detail. To reads the events do a cat /sys/kernel/debug/tracing/trace Compared to the last posting this patch converts the tracing mostly to the one tracepoint per callsite model that other users of the new tracing facility also employ. This allows a very fine-grained control of the tracing, a cleaner output of the traces and also enables the perf tool to use each tracepoint as a virtual performance counter, allowing us to e.g. count how often certain workloads git various spots in XFS. Take a look at http://lwn.net/Articles/346470/ for some examples. Also the btree tracing isn't included at all yet, as it will require additional core tracing features not in mainline yet, I plan to deliver it later. And the really nice thing about this patch is that it actually removes many lines of code while adding this nice functionality: fs/xfs/Makefile | 8 fs/xfs/linux-2.6/xfs_acl.c | 1 fs/xfs/linux-2.6/xfs_aops.c | 52 - fs/xfs/linux-2.6/xfs_aops.h | 2 fs/xfs/linux-2.6/xfs_buf.c | 117 +-- fs/xfs/linux-2.6/xfs_buf.h | 33 fs/xfs/linux-2.6/xfs_fs_subr.c | 3 fs/xfs/linux-2.6/xfs_ioctl.c | 1 fs/xfs/linux-2.6/xfs_ioctl32.c | 1 fs/xfs/linux-2.6/xfs_iops.c | 1 fs/xfs/linux-2.6/xfs_linux.h | 1 fs/xfs/linux-2.6/xfs_lrw.c | 87 -- fs/xfs/linux-2.6/xfs_lrw.h | 45 - fs/xfs/linux-2.6/xfs_super.c | 104 --- fs/xfs/linux-2.6/xfs_super.h | 7 fs/xfs/linux-2.6/xfs_sync.c | 1 fs/xfs/linux-2.6/xfs_trace.c | 75 ++ fs/xfs/linux-2.6/xfs_trace.h | 1369 +++++++++++++++++++++++++++++++++++++++++ fs/xfs/linux-2.6/xfs_vnode.h | 4 fs/xfs/quota/xfs_dquot.c | 110 --- fs/xfs/quota/xfs_dquot.h | 21 fs/xfs/quota/xfs_qm.c | 40 - fs/xfs/quota/xfs_qm_syscalls.c | 4 fs/xfs/support/ktrace.c | 323 --------- fs/xfs/support/ktrace.h | 85 -- fs/xfs/xfs.h | 16 fs/xfs/xfs_ag.h | 14 fs/xfs/xfs_alloc.c | 230 +----- fs/xfs/xfs_alloc.h | 27 fs/xfs/xfs_alloc_btree.c | 1 fs/xfs/xfs_attr.c | 107 --- fs/xfs/xfs_attr.h | 10 fs/xfs/xfs_attr_leaf.c | 14 fs/xfs/xfs_attr_sf.h | 40 - fs/xfs/xfs_bmap.c | 507 +++------------ fs/xfs/xfs_bmap.h | 49 - fs/xfs/xfs_bmap_btree.c | 6 fs/xfs/xfs_btree.c | 5 fs/xfs/xfs_btree_trace.h | 17 fs/xfs/xfs_buf_item.c | 87 -- fs/xfs/xfs_buf_item.h | 20 fs/xfs/xfs_da_btree.c | 3 fs/xfs/xfs_da_btree.h | 7 fs/xfs/xfs_dfrag.c | 2 fs/xfs/xfs_dir2.c | 8 fs/xfs/xfs_dir2_block.c | 20 fs/xfs/xfs_dir2_leaf.c | 21 fs/xfs/xfs_dir2_node.c | 27 fs/xfs/xfs_dir2_sf.c | 26 fs/xfs/xfs_dir2_trace.c | 216 ------ fs/xfs/xfs_dir2_trace.h | 72 -- fs/xfs/xfs_filestream.c | 8 fs/xfs/xfs_fsops.c | 2 fs/xfs/xfs_iget.c | 111 --- fs/xfs/xfs_inode.c | 67 -- fs/xfs/xfs_inode.h | 76 -- fs/xfs/xfs_inode_item.c | 5 fs/xfs/xfs_iomap.c | 85 -- fs/xfs/xfs_iomap.h | 8 fs/xfs/xfs_log.c | 181 +---- fs/xfs/xfs_log_priv.h | 20 fs/xfs/xfs_log_recover.c | 1 fs/xfs/xfs_mount.c | 2 fs/xfs/xfs_quota.h | 8 fs/xfs/xfs_rename.c | 1 fs/xfs/xfs_rtalloc.c | 1 fs/xfs/xfs_rw.c | 3 fs/xfs/xfs_trans.h | 47 + fs/xfs/xfs_trans_buf.c | 62 - fs/xfs/xfs_vnodeops.c | 8 70 files changed, 2151 insertions(+), 2592 deletions(-) Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NAlex Elder <aelder@sgi.com>
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- 08 6月, 2009 1 次提交
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由 Christoph Hellwig 提交于
xfs_sync_inodes is used to write back either file data or inode metadata. In general we always do these separately, except for one fishy case in xfs_fs_put_super that does both. So separate xfs_sync_inodes into separate xfs_sync_data and xfs_sync_attr functions. In xfs_fs_put_super we first call the data sync and then the attr sync as that was the previous order. The moved log force in that path doesn't make a difference because we will force the log again as part of the real unmount process. The filesystem readonly checks are not performed by the new function but instead moved into the callers, given that most callers alredy have it further up in the stack. Also add debug checks that we do not pass in incorrect flags in the new xfs_sync_data and xfs_sync_attr function and fix the one place that did pass in a wrong flag. Also remove a comment mentioning xfs_sync_inodes that has been incorrect for a while because we always take either the iolock or ilock in the sync path these days. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NEric Sandeen <sandeen@sandeen.net>
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- 16 3月, 2009 1 次提交
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由 Dave Chinner 提交于
Signed-off-by: NDave Chinner <dgc@sgi.com> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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- 13 8月, 2008 1 次提交
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由 Lachlan McIlroy 提交于
Use KM_NOFS to prevent recursion back into the filesystem which can cause deadlocks. In the case of xfs_iread() we hold the lock on the inode cluster buffer while allocating memory for the trace buffers. If we recurse back into XFS to flush data that may require a transaction to allocate extents which needs log space. This can deadlock with the xfsaild thread which can't push the tail of the log because it is trying to get the inode cluster buffer lock. SGI-PV: 981498 SGI-Modid: xfs-linux-melb:xfs-kern:31838a Signed-off-by: NLachlan McIlroy <lachlan@sgi.com> Signed-off-by: NDavid Chinner <david@fromorbit.com>
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- 28 7月, 2008 1 次提交
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由 Christoph Hellwig 提交于
Currently the xfs module init/exit code is a mess. It's farmed out over a lot of function with very little error checking. This patch makes sure we propagate all initialization failures properly and clean up after them. Various runtime initializations are replaced with compile-time initializations where possible to make this easier. The exit path is similarly consolidated. There's now split out function to create/destroy the kmem zones and alloc/free the trace buffers. I've also changed the ktrace allocations to KM_MAYFAIL and handled errors resulting from that. And yes, we really should replace the XFS_*_TRACE ifdefs with a single XFS_TRACE.. SGI-PV: 976035 SGI-Modid: xfs-linux-melb:xfs-kern:31354a Signed-off-by: NChristoph Hellwig <hch@infradead.org> Signed-off-by: NNiv Sardi <xaiki@sgi.com> Signed-off-by: NLachlan McIlroy <lachlan@sgi.com>
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- 18 4月, 2008 1 次提交
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由 Harvey Harrison 提交于
__FUNCTION__ is gcc-specific, use __func__ SGI-PV: 976035 SGI-Modid: xfs-linux-melb:xfs-kern:30775a Signed-off-by: NHarvey Harrison <harvey.harrison@gmail.com> Signed-off-by: NDavid Chinner <dgc@sgi.com> Signed-off-by: NLachlan McIlroy <lachlan@sgi.com>
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- 07 2月, 2008 1 次提交
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由 David Chinner 提交于
These are mostly locking annotations, marking things static, casts where needed and declaring stuff in header files. SGI-PV: 971186 SGI-Modid: xfs-linux-melb:xfs-kern:30002a Signed-off-by: NDavid Chinner <dgc@sgi.com> Signed-off-by: NChristoph Hellwig <hch@infradead.org> Signed-off-by: NLachlan McIlroy <lachlan@sgi.com>
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- 20 9月, 2007 1 次提交
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由 Eric Sandeen 提交于
xfs_filestream_mount() sets up an mru cache with: err = xfs_mru_cache_create(&mp->m_filestream, lifetime, grp_count, (xfs_mru_cache_free_func_t)xfs_fstrm_free_func); but that cast is causing problems... typedef void (*xfs_mru_cache_free_func_t)(unsigned long, void*); but: void xfs_fstrm_free_func( xfs_ino_t ino, fstrm_item_t *item) so on a 32-bit box, it's casting (32, 32) args into (64, 32) and I assume it's getting garbage for *item, which subsequently causes an explosion. With this change the filestreams xfsqa tests don't oops on my 32-bit box. SGI-PV: 967795 SGI-Modid: xfs-linux-melb:xfs-kern:29510a Signed-off-by: NEric Sandeen <sandeen@sandeen.net> Signed-off-by: NDavid Chinner <dgc@sgi.com> Signed-off-by: NTim Shimmin <tes@sgi.com>
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- 17 9月, 2007 1 次提交
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由 David Chinner 提交于
Instead of running the mru cache reaper all the time based on a timeout, we should only run it when the cache has active objects. This allows CPUs to sleep when there is no activity rather than be woken repeatedly just to check if there is anything to do. SGI-PV: 968554 SGI-Modid: xfs-linux-melb:xfs-kern:29305a Signed-off-by: NDavid Chinner <dgc@sgi.com> Signed-off-by: NDonald Douwsma <donaldd@sgi.com> Signed-off-by: NTim Shimmin <tes@sgi.com>
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- 14 7月, 2007 1 次提交
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由 David Chinner 提交于
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: NDavid Chinner <dgc@sgi.com> Signed-off-by: NBarry Naujok <bnaujok@sgi.com> Signed-off-by: NDonald Douwsma <donaldd@sgi.com> Signed-off-by: NChristoph Hellwig <hch@infradead.org> Signed-off-by: NTim Shimmin <tes@sgi.com> Signed-off-by: NVlad Apostolov <vapo@sgi.com>
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