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9p: don't bother with private lock in ->d_fsdata; dentry->d_lock will do just fine 

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2013-02-27 22:37:21 -05:00
parent 6131ffaa1f
commit 634095dab2
2 changed files with 6 additions and 7 deletions
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9
fs/9p/fid.c
View File

@ -54,14 +54,13 @@ int v9fs_fid_add(struct dentry *dentry, struct p9_fid *fid)
if (!dent)
return -ENOMEM;
spin_lock_init(&dent->lock);
INIT_LIST_HEAD(&dent->fidlist);
dentry->d_fsdata = dent;
}
spin_lock(&dent->lock);
spin_lock(&dentry->d_lock);
list_add(&fid->dlist, &dent->fidlist);
spin_unlock(&dent->lock);
spin_unlock(&dentry->d_lock);
return 0;
}
@ -85,14 +84,14 @@ static struct p9_fid *v9fs_fid_find(struct dentry *dentry, kuid_t uid, int any)
dent = (struct v9fs_dentry *) dentry->d_fsdata;
ret = NULL;
if (dent) {
spin_lock(&dent->lock);
spin_lock(&dentry->d_lock);
list_for_each_entry(fid, &dent->fidlist, dlist) {
if (any || uid_eq(fid->uid, uid)) {
ret = fid;
break;
}
}
spin_unlock(&dent->lock);
spin_unlock(&dentry->d_lock);
}
return ret;

4
fs/9p/fid.h
View File

@ -25,7 +25,6 @@
/**
* struct v9fs_dentry - 9p private data stored in dentry d_fsdata
* @lock: protects the fidlist
* @fidlist: list of FIDs currently associated with this dentry
*
* This structure defines the 9p private data associated with
@ -35,11 +34,12 @@
* inodes in order to more closely map functionality to the Plan 9
* expected behavior for FID reclaimation and tracking.
*
* Protected by ->d_lock of dentry it belongs to.
*
* See Also: Mapping FIDs to Linux VFS model in
* Design and Implementation of the Linux 9P File System documentation
*/
struct v9fs_dentry {
spinlock_t lock; /* protect fidlist */
struct list_head fidlist;
};