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nfs: per-name sillyunlink exclusion

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use d_alloc_parallel() for sillyunlink/lookup exclusion and
explicit rwsem (nfs_rmdir() being a writer and nfs_call_unlink() -
a reader) for rmdir/sillyunlink one.

That ought to make lookup/readdir/!O_CREAT atomic_open really
parallel on NFS.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2016-04-28 23:56:31 -04:00
parent 9ac3d3e846
commit 884be17535
7 changed files with 71 additions and 174 deletions
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11
include/linux/nfs_fs.h
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@@ -163,11 +163,9 @@ struct nfs_inode {
/* Open contexts for shared mmap writes */
struct list_head open_files;
/* Number of in-flight sillydelete RPC calls */
atomic_t silly_count;
/* List of deferred sillydelete requests */
struct hlist_head silly_list;
wait_queue_head_t waitqueue;
/* Readers: in-flight sillydelete RPC calls */
/* Writers: rmdir */
struct rw_semaphore rmdir_sem;
#if IS_ENABLED(CONFIG_NFS_V4)
struct nfs4_cached_acl *nfs4_acl;
@@ -492,9 +490,6 @@ extern void nfs_release_automount_timer(void);
* linux/fs/nfs/unlink.c
*/
extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);
extern void nfs_wait_on_sillyrename(struct dentry *dentry);
extern void nfs_block_sillyrename(struct dentry *dentry);
extern void nfs_unblock_sillyrename(struct dentry *dentry);
/*
* linux/fs/nfs/write.c