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fs: scale inode alias list

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Add a new lock, dcache_inode_lock, to protect the inode's i_dentry list
from concurrent modification. d_alias is also protected by d_lock.

Signed-off-by: Nick Piggin <npiggin@kernel.dk>
This commit is contained in:
Nick Piggin
2011-01-07 17:49:35 +11:00
parent 2fd6b7f507
commit b23fb0a603
9 changed files with 78 additions and 9 deletions
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3
fs/ocfs2/dcache.c
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@@ -170,7 +170,7 @@ struct dentry *ocfs2_find_local_alias(struct inode *inode,
struct dentry *dentry = NULL;
spin_lock(&dcache_lock);
spin_lock(&dcache_inode_lock);
list_for_each(p, &inode->i_dentry) {
dentry = list_entry(p, struct dentry, d_alias);
@@ -188,6 +188,7 @@ struct dentry *ocfs2_find_local_alias(struct inode *inode,
dentry = NULL;
}
spin_unlock(&dcache_inode_lock);
spin_unlock(&dcache_lock);
return dentry;