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authorDave Chinner <david@fromorbit.com>2010-01-11 11:47:44 +0000
committerAlex Elder <aelder@sgi.com>2010-01-15 15:33:52 -0600
commit1c1c6ebcf5284aee4910f3b906ac90c20e510c82 (patch)
treebbcf74752bf7bc058a5c5bdd6bd03090c845b041 /fs/xfs/xfs_filestream.c
parent44b56e0a1aed522a10051645e85d300e10926fd3 (diff)
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xfs: Replace per-ag array with a radix tree
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: Dave Chinner <david@fromorbit.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Alex Elder <aelder@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_filestream.c')
-rw-r--r--fs/xfs/xfs_filestream.c13
1 files changed, 4 insertions, 9 deletions
diff --git a/fs/xfs/xfs_filestream.c b/fs/xfs/xfs_filestream.c
index e61f2aa088a..914d00d0f11 100644
--- a/fs/xfs/xfs_filestream.c
+++ b/fs/xfs/xfs_filestream.c
@@ -253,8 +253,7 @@ next_ag:
/*
* Set the allocation group number for a file or a directory, updating inode
- * references and per-AG references as appropriate. Must be called with the
- * m_peraglock held in read mode.
+ * references and per-AG references as appropriate.
*/
static int
_xfs_filestream_update_ag(
@@ -456,10 +455,10 @@ xfs_filestream_unmount(
}
/*
- * If the mount point's m_perag array is going to be reallocated, all
+ * If the mount point's m_perag tree is going to be modified, all
* outstanding cache entries must be flushed to avoid accessing reference count
* addresses that have been freed. The call to xfs_filestream_flush() must be
- * made inside the block that holds the m_peraglock in write mode to do the
+ * made inside the block that holds the m_perag_lock in write mode to do the
* reallocation.
*/
void
@@ -531,7 +530,6 @@ xfs_filestream_associate(
mp = pip->i_mount;
cache = mp->m_filestream;
- down_read(&mp->m_peraglock);
/*
* We have a problem, Houston.
@@ -548,10 +546,8 @@ xfs_filestream_associate(
*
* So, if we can't get the iolock without sleeping then just give up
*/
- if (!xfs_ilock_nowait(pip, XFS_IOLOCK_EXCL)) {
- up_read(&mp->m_peraglock);
+ if (!xfs_ilock_nowait(pip, XFS_IOLOCK_EXCL))
return 1;
- }
/* If the parent directory is already in the cache, use its AG. */
item = xfs_mru_cache_lookup(cache, pip->i_ino);
@@ -606,7 +602,6 @@ exit_did_pick:
exit:
xfs_iunlock(pip, XFS_IOLOCK_EXCL);
- up_read(&mp->m_peraglock);
return -err;
}