142 lines
3.6 KiB
C
142 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* (C) 2001 Clemson University and The University of Chicago
|
|
*
|
|
* See COPYING in top-level directory.
|
|
*/
|
|
|
|
/*
|
|
* Implementation of dentry (directory cache) functions.
|
|
*/
|
|
|
|
#include "protocol.h"
|
|
#include "orangefs-kernel.h"
|
|
|
|
/* Returns 1 if dentry can still be trusted, else 0. */
|
|
static int orangefs_revalidate_lookup(struct dentry *dentry)
|
|
{
|
|
struct dentry *parent_dentry = dget_parent(dentry);
|
|
struct inode *parent_inode = parent_dentry->d_inode;
|
|
struct orangefs_inode_s *parent = ORANGEFS_I(parent_inode);
|
|
struct inode *inode = dentry->d_inode;
|
|
struct orangefs_kernel_op_s *new_op;
|
|
int ret = 0;
|
|
int err = 0;
|
|
|
|
gossip_debug(GOSSIP_DCACHE_DEBUG, "%s: attempting lookup.\n", __func__);
|
|
|
|
new_op = op_alloc(ORANGEFS_VFS_OP_LOOKUP);
|
|
if (!new_op) {
|
|
ret = -ENOMEM;
|
|
goto out_put_parent;
|
|
}
|
|
|
|
new_op->upcall.req.lookup.sym_follow = ORANGEFS_LOOKUP_LINK_NO_FOLLOW;
|
|
new_op->upcall.req.lookup.parent_refn = parent->refn;
|
|
strscpy(new_op->upcall.req.lookup.d_name, dentry->d_name.name);
|
|
|
|
gossip_debug(GOSSIP_DCACHE_DEBUG,
|
|
"%s:%s:%d interrupt flag [%d]\n",
|
|
__FILE__,
|
|
__func__,
|
|
__LINE__,
|
|
get_interruptible_flag(parent_inode));
|
|
|
|
err = service_operation(new_op, "orangefs_lookup",
|
|
get_interruptible_flag(parent_inode));
|
|
|
|
/* Positive dentry: reject if error or not the same inode. */
|
|
if (inode) {
|
|
if (err) {
|
|
gossip_debug(GOSSIP_DCACHE_DEBUG,
|
|
"%s:%s:%d lookup failure.\n",
|
|
__FILE__, __func__, __LINE__);
|
|
goto out_drop;
|
|
}
|
|
if (!match_handle(new_op->downcall.resp.lookup.refn.khandle,
|
|
inode)) {
|
|
gossip_debug(GOSSIP_DCACHE_DEBUG,
|
|
"%s:%s:%d no match.\n",
|
|
__FILE__, __func__, __LINE__);
|
|
goto out_drop;
|
|
}
|
|
|
|
/* Negative dentry: reject if success or error other than ENOENT. */
|
|
} else {
|
|
gossip_debug(GOSSIP_DCACHE_DEBUG, "%s: negative dentry.\n",
|
|
__func__);
|
|
if (!err || err != -ENOENT) {
|
|
if (new_op->downcall.status != 0)
|
|
gossip_debug(GOSSIP_DCACHE_DEBUG,
|
|
"%s:%s:%d lookup failure.\n",
|
|
__FILE__, __func__, __LINE__);
|
|
goto out_drop;
|
|
}
|
|
}
|
|
|
|
orangefs_set_timeout(dentry);
|
|
ret = 1;
|
|
out_release_op:
|
|
op_release(new_op);
|
|
out_put_parent:
|
|
dput(parent_dentry);
|
|
return ret;
|
|
out_drop:
|
|
gossip_debug(GOSSIP_DCACHE_DEBUG, "%s:%s:%d revalidate failed\n",
|
|
__FILE__, __func__, __LINE__);
|
|
goto out_release_op;
|
|
}
|
|
|
|
/*
|
|
* Verify that dentry is valid.
|
|
*
|
|
* Should return 1 if dentry can still be trusted, else 0.
|
|
*/
|
|
static int orangefs_d_revalidate(struct dentry *dentry, unsigned int flags)
|
|
{
|
|
int ret;
|
|
unsigned long time = (unsigned long) dentry->d_fsdata;
|
|
|
|
if (time_before(jiffies, time))
|
|
return 1;
|
|
|
|
if (flags & LOOKUP_RCU)
|
|
return -ECHILD;
|
|
|
|
gossip_debug(GOSSIP_DCACHE_DEBUG, "%s: called on dentry %p.\n",
|
|
__func__, dentry);
|
|
|
|
/* skip root handle lookups. */
|
|
if (dentry->d_inode && is_root_handle(dentry->d_inode))
|
|
return 1;
|
|
|
|
/*
|
|
* If this passes, the positive dentry still exists or the negative
|
|
* dentry still does not exist.
|
|
*/
|
|
if (!orangefs_revalidate_lookup(dentry))
|
|
return 0;
|
|
|
|
/* We do not need to continue with negative dentries. */
|
|
if (!dentry->d_inode) {
|
|
gossip_debug(GOSSIP_DCACHE_DEBUG,
|
|
"%s: negative dentry or positive dentry and inode valid.\n",
|
|
__func__);
|
|
return 1;
|
|
}
|
|
|
|
/* Now we must perform a getattr to validate the inode contents. */
|
|
|
|
ret = orangefs_inode_check_changed(dentry->d_inode);
|
|
if (ret < 0) {
|
|
gossip_debug(GOSSIP_DCACHE_DEBUG, "%s:%s:%d getattr failure.\n",
|
|
__FILE__, __func__, __LINE__);
|
|
return 0;
|
|
}
|
|
return !ret;
|
|
}
|
|
|
|
const struct dentry_operations orangefs_dentry_operations = {
|
|
.d_revalidate = orangefs_d_revalidate,
|
|
};
|