Release 4.11 fs/orangefs/dcache.c
/*
* (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)
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;
strncpy(new_op->upcall.req.lookup.d_name,
dentry->d_name.name,
ORANGEFS_NAME_MAX);
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mike Marshall | 245 | 74.47% | 1 | 16.67% |
| Martin Brandenburg | 74 | 22.49% | 3 | 50.00% |
| Yi Liu | 7 | 2.13% | 1 | 16.67% |
| Miklos Szeredi | 3 | 0.91% | 1 | 16.67% |
| Total | 329 | 100.00% | 6 | 100.00% |
/*
* 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)
goto out;
/* 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;
}
if (ret == 0)
return 0;
out:
gossip_debug(GOSSIP_DCACHE_DEBUG,
"%s: negative dentry or positive dentry and inode valid.\n",
__func__);
return 1;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Martin Brandenburg | 84 | 52.50% | 4 | 50.00% |
| Mike Marshall | 62 | 38.75% | 2 | 25.00% |
| Miklos Szeredi | 13 | 8.12% | 1 | 12.50% |
| Yi Liu | 1 | 0.62% | 1 | 12.50% |
| Total | 160 | 100.00% | 8 | 100.00% |
const struct dentry_operations orangefs_dentry_operations = {
.d_revalidate = orangefs_d_revalidate,
};
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Mike Marshall | 327 | 63.99% | 3 | 30.00% |
| Martin Brandenburg | 158 | 30.92% | 5 | 50.00% |
| Miklos Szeredi | 16 | 3.13% | 1 | 10.00% |
| Yi Liu | 10 | 1.96% | 1 | 10.00% |
| Total | 511 | 100.00% | 10 | 100.00% |
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.