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