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authorDave Chinner <dchinner@redhat.com>2011-07-08 14:14:43 +1000
committerAl Viro <viro@zeniv.linux.org.uk>2011-07-20 20:47:40 -0400
commit4f8c19fdf3f97402b68f058b1c72a6c7166c9e59 (patch)
tree1e986c639955955f6191c46bcfa831e6bb466d60 /fs/inode.c
parentb0d40c92adafde7c2d81203ce7c1c69275f41140 (diff)
inode: remove iprune_sem
Now that we have per-sb shrinkers with a lifecycle that is a subset of the superblock lifecycle and can reliably detect a filesystem being unmounted, there is not longer any race condition for the iprune_sem to protect against. Hence we can remove it. Signed-off-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/inode.c')
-rw-r--r--fs/inode.c21
1 files changed, 0 insertions, 21 deletions
diff --git a/fs/inode.c b/fs/inode.c
index 1fdbb64a952..cf81baf1898 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -68,17 +68,6 @@ __cacheline_aligned_in_smp DEFINE_SPINLOCK(inode_sb_list_lock);
__cacheline_aligned_in_smp DEFINE_SPINLOCK(inode_wb_list_lock);
/*
- * iprune_sem provides exclusion between the icache shrinking and the
- * umount path.
- *
- * We don't actually need it to protect anything in the umount path,
- * but only need to cycle through it to make sure any inode that
- * prune_icache_sb took off the LRU list has been fully torn down by the
- * time we are past evict_inodes.
- */
-static DECLARE_RWSEM(iprune_sem);
-
-/*
* Empty aops. Can be used for the cases where the user does not
* define any of the address_space operations.
*/
@@ -542,14 +531,6 @@ void evict_inodes(struct super_block *sb)
spin_unlock(&inode_sb_list_lock);
dispose_list(&dispose);
-
- /*
- * Cycle through iprune_sem to make sure any inode that prune_icache_sb
- * moved off the list before we took the lock has been fully torn
- * down.
- */
- down_write(&iprune_sem);
- up_write(&iprune_sem);
}
/**
@@ -635,7 +616,6 @@ void prune_icache_sb(struct super_block *sb, int nr_to_scan)
int nr_scanned;
unsigned long reap = 0;
- down_read(&iprune_sem);
spin_lock(&sb->s_inode_lru_lock);
for (nr_scanned = nr_to_scan; nr_scanned >= 0; nr_scanned--) {
struct inode *inode;
@@ -711,7 +691,6 @@ void prune_icache_sb(struct super_block *sb, int nr_to_scan)
spin_unlock(&sb->s_inode_lru_lock);
dispose_list(&freeable);
- up_read(&iprune_sem);
}
static void __wait_on_freeing_inode(struct inode *inode);