fs: scale inode alias list
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>
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@ -271,9 +271,11 @@ static struct dentry *v9fs_dentry_from_dir_inode(struct inode *inode)
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struct dentry *dentry;
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spin_lock(&dcache_lock);
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spin_lock(&dcache_inode_lock);
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/* Directory should have only one entry. */
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BUG_ON(S_ISDIR(inode->i_mode) && !list_is_singular(&inode->i_dentry));
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dentry = list_entry(inode->i_dentry.next, struct dentry, d_alias);
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spin_unlock(&dcache_inode_lock);
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spin_unlock(&dcache_lock);
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return dentry;
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}
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