Hi, all:
I am studying the dcache in VFS recently . I've found that hlist of dcache is
already protected by RCU in __d_lookup.Is it necessary for the function --
d_lookup using sequence lock to protect the hlist again?
struct dentry * d_lookup(struct dentry * parent, struct qstr * name){ struct
dentry * dentry = NULL; unsigned long seq;
do { seq = read_seqbegin(&rename_lock);
dentry = __d_lookup(parent, name); if (dentry)
break; } while (read_seqretry(&rename_lock, seq)); return dentry;}
Thanks in advance--------------------------------Rock Lee
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