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| author | Nick Piggin <npiggin@kernel.dk> | 2011-01-07 17:49:32 +1100 |
|---|---|---|
| committer | Nick Piggin <npiggin@kernel.dk> | 2011-01-07 17:50:21 +1100 |
| commit | b7ab39f631f505edc2bbdb86620d5493f995c9da (patch) | |
| tree | 62be97ebc7fc69ceb601f23312d335ebb8038ee7 /fs/ceph | |
| parent | 2304450783dfde7b0b94ae234edd0dbffa865073 (diff) | |
| download | lwn-b7ab39f631f505edc2bbdb86620d5493f995c9da.tar.gz lwn-b7ab39f631f505edc2bbdb86620d5493f995c9da.zip | |
fs: dcache scale dentry refcount
Make d_count non-atomic and protect it with d_lock. This allows us to ensure a
0 refcount dentry remains 0 without dcache_lock. It is also fairly natural when
we start protecting many other dentry members with d_lock.
Signed-off-by: Nick Piggin <npiggin@kernel.dk>
Diffstat (limited to 'fs/ceph')
| -rw-r--r-- | fs/ceph/dir.c | 4 | ||||
| -rw-r--r-- | fs/ceph/inode.c | 4 | ||||
| -rw-r--r-- | fs/ceph/mds_client.c | 2 |
3 files changed, 6 insertions, 4 deletions
diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c index d902948a90d8..3ecf915a4550 100644 --- a/fs/ceph/dir.c +++ b/fs/ceph/dir.c @@ -150,7 +150,9 @@ more: di = ceph_dentry(dentry); } - atomic_inc(&dentry->d_count); + spin_lock(&dentry->d_lock); + dentry->d_count++; + spin_unlock(&dentry->d_lock); spin_unlock(&dcache_lock); dout(" %llu (%llu) dentry %p %.*s %p\n", di->offset, filp->f_pos, diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c index bf1286588f26..bb68c799074d 100644 --- a/fs/ceph/inode.c +++ b/fs/ceph/inode.c @@ -879,8 +879,8 @@ static struct dentry *splice_dentry(struct dentry *dn, struct inode *in, } else if (realdn) { dout("dn %p (%d) spliced with %p (%d) " "inode %p ino %llx.%llx\n", - dn, atomic_read(&dn->d_count), - realdn, atomic_read(&realdn->d_count), + dn, dn->d_count, + realdn, realdn->d_count, realdn->d_inode, ceph_vinop(realdn->d_inode)); dput(dn); dn = realdn; diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c index 38800eaa81d0..a50fca1e03be 100644 --- a/fs/ceph/mds_client.c +++ b/fs/ceph/mds_client.c @@ -1486,7 +1486,7 @@ retry: *base = ceph_ino(temp->d_inode); *plen = len; dout("build_path on %p %d built %llx '%.*s'\n", - dentry, atomic_read(&dentry->d_count), *base, len, path); + dentry, dentry->d_count, *base, len, path); return path; } |