*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; If not, see
- * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
- *
- * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
- * CA 95054 USA or visit www.sun.com if you need additional information or
- * have any questions.
+ * http://www.gnu.org/licenses/gpl-2.0.html
*
* GPL HEADER END
*/
* Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
- * Copyright (c) 2011, 2013, Intel Corporation.
+ * Copyright (c) 2011, 2017, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
#define DEBUG_SUBSYSTEM S_LLITE
#include <obd_support.h>
-#include <lustre_lite.h>
-#include <lustre/lustre_idl.h>
#include <lustre_dlm.h>
#include "llite_internal.h"
if (lld == NULL) /* NFS copies the de->d_op methods (bug 4655) */
RETURN_EXIT;
- if (lld->lld_it) {
- ll_intent_release(lld->lld_it);
- OBD_FREE(lld->lld_it, sizeof(*lld->lld_it));
- }
- LASSERT(lld->lld_cwd_count == 0);
- LASSERT(lld->lld_mnt_count == 0);
de->d_fsdata = NULL;
call_rcu(&lld->lld_rcu_head, free_dentry_data);
* This avoids a race where ll_lookup_it() instantiates a dentry, but we get
* an AST before calling d_revalidate_it(). The dentry still exists (marked
* INVALID) so d_lookup() matches it, but we have no lock on it (so
- * lock_match() fails) and we spin around real_lookup(). */
-#ifdef HAVE_D_COMPARE_7ARGS
-int ll_dcompare(const struct dentry *parent, const struct inode *pinode,
- const struct dentry *dentry, const struct inode *inode,
- unsigned int len, const char *str, const struct qstr *name)
-#else
-int ll_dcompare(struct dentry *parent, struct qstr *d_name, struct qstr *name)
+ * lock_match() fails) and we spin around real_lookup().
+ *
+ * This race doesn't apply to lookups in d_alloc_parallel(), and for
+ * those we want to ensure that only one dentry with a given name is
+ * in ll_lookup_nd() at a time. So allow invalid dentries to match
+ * while d_in_lookup(). We will be called again when the lookup
+ * completes, and can give a different answer then.
+ */
+#if defined(HAVE_D_COMPARE_5ARGS)
+static int ll_dcompare(const struct dentry *parent, const struct dentry *dentry,
+ unsigned int len, const char *str,
+ const struct qstr *name)
+#elif defined(HAVE_D_COMPARE_4ARGS)
+static int ll_dcompare(const struct dentry *dentry, unsigned int len,
+ const char *str, const struct qstr *name)
#endif
{
-#ifdef HAVE_D_COMPARE_7ARGS
ENTRY;
if (len != name->len)
if (memcmp(str, name->name, len))
RETURN(1);
-#else
- struct dentry *dentry;
- ENTRY;
-
- if (d_name->len != name->len)
- RETURN(1);
-
- if (memcmp(d_name->name, name->name, name->len))
- RETURN(1);
-
- /* XXX: d_name must be in-dentry structure */
- dentry = container_of(d_name, struct dentry, d_name); /* ugh */
-#endif
CDEBUG(D_DENTRY, "found name %.*s(%p) flags %#x refc %d\n",
name->len, name->name, dentry, dentry->d_flags,
- d_refcount(dentry));
+ ll_d_count(dentry));
/* mountpoint is always valid */
if (d_mountpoint((struct dentry *)dentry))
RETURN(0);
- if (d_lustre_invalid(dentry))
- RETURN(1);
-
- RETURN(0);
-}
-
-static inline int return_if_equal(struct ldlm_lock *lock, void *data)
-{
- return (ldlm_is_canceling(lock) && ldlm_is_discard_data(lock)) ?
- LDLM_ITER_CONTINUE : LDLM_ITER_STOP;
-}
-
-/* find any ldlm lock of the inode in mdc and lov
- * return 0 not find
- * 1 find one
- * < 0 error */
-static int find_cbdata(struct inode *inode)
-{
- struct ll_sb_info *sbi = ll_i2sbi(inode);
- struct lov_stripe_md *lsm;
- int rc = 0;
- ENTRY;
-
- LASSERT(inode);
- rc = md_find_cbdata(sbi->ll_md_exp, ll_inode2fid(inode),
- return_if_equal, NULL);
- if (rc != 0)
- RETURN(rc);
-
- lsm = ccc_inode_lsm_get(inode);
- if (lsm == NULL)
- RETURN(rc);
+ /* ensure exclusion against parallel lookup of the same name */
+ if (d_in_lookup((struct dentry *)dentry))
+ return 0;
- rc = obd_find_cbdata(sbi->ll_dt_exp, lsm, return_if_equal, NULL);
- ccc_inode_lsm_put(inode, lsm);
+ if (d_lustre_invalid(dentry))
+ RETURN(1);
- RETURN(rc);
+ RETURN(0);
}
/**
* - return 0 to cache the dentry
* Should NOT be called with the dcache lock, see fs/dcache.c
*/
-static int ll_ddelete(HAVE_D_DELETE_CONST struct dentry *de)
+static int ll_ddelete(const struct dentry *de)
{
ENTRY;
LASSERT(de);
- CDEBUG(D_DENTRY, "%s dentry %.*s (%p, parent %p, inode %p) %s%s\n",
+ CDEBUG(D_DENTRY, "%s dentry %pd (%p, parent %p, inode %p) %s%s\n",
d_lustre_invalid((struct dentry *)de) ? "deleting" : "keeping",
- de->d_name.len, de->d_name.name, de, de->d_parent, de->d_inode,
+ de, de, de->d_parent, de->d_inode,
d_unhashed((struct dentry *)de) ? "" : "hashed,",
list_empty(&de->d_subdirs) ? "" : "subdirs");
-#ifdef HAVE_DCACHE_LOCK
- LASSERT(d_refcount(de) == 0);
-#else
/* kernel >= 2.6.38 last refcount is decreased after this function. */
- LASSERT(d_refcount(de) == 1);
-#endif
-
- /* Disable this piece of code temproarily because this is called
- * inside dcache_lock so it's not appropriate to do lots of work
- * here. ATTENTION: Before this piece of code enabling, LU-2487 must be
- * resolved. */
-#if 0
- /* if not ldlm lock for this inode, set i_nlink to 0 so that
- * this inode can be recycled later b=20433 */
- if (de->d_inode && !find_cbdata(de->d_inode))
- clear_nlink(de->d_inode);
-#endif
+ LASSERT(ll_d_count(de) == 1);
if (d_lustre_invalid((struct dentry *)de))
RETURN(1);
ENTRY;
LASSERT(de != NULL);
- CDEBUG(D_DENTRY, "ldd on dentry %.*s (%p) parent %p inode %p refc %d\n",
- de->d_name.len, de->d_name.name, de, de->d_parent, de->d_inode,
- d_refcount(de));
+ CDEBUG(D_DENTRY, "ldd on dentry %pd (%p) parent %p inode %p refc %d\n",
+ de, de, de->d_parent, de->d_inode,
+ ll_d_count(de));
if (de->d_fsdata == NULL) {
struct ll_dentry_data *lld;
if (likely(de->d_fsdata == NULL)) {
de->d_fsdata = lld;
__d_lustre_invalidate(de);
-#ifdef HAVE_DCACHE_LOCK
- /* kernel >= 2.6.38 d_op is set in d_alloc() */
- de->d_op = &ll_d_ops;
-#endif
} else {
OBD_FREE_PTR(lld);
}
void ll_intent_drop_lock(struct lookup_intent *it)
{
- if (it->it_op && it->d.lustre.it_lock_mode) {
+ if (it->it_op && it->it_lock_mode) {
struct lustre_handle handle;
- handle.cookie = it->d.lustre.it_lock_handle;
+ handle.cookie = it->it_lock_handle;
- CDEBUG(D_DLMTRACE, "releasing lock with cookie "LPX64
- " from it %p\n", handle.cookie, it);
- ldlm_lock_decref(&handle, it->d.lustre.it_lock_mode);
+ CDEBUG(D_DLMTRACE, "releasing lock with cookie %#llx from it %p\n",
+ handle.cookie, it);
+ ldlm_lock_decref(&handle, it->it_lock_mode);
- /* bug 494: intent_release may be called multiple times, from
- * this thread and we don't want to double-decref this lock */
- it->d.lustre.it_lock_mode = 0;
- if (it->d.lustre.it_remote_lock_mode != 0) {
- handle.cookie = it->d.lustre.it_remote_lock_handle;
+ /* bug 494: intent_release may be called multiple times, from
+ * this thread and we don't want to double-decref this lock */
+ it->it_lock_mode = 0;
+ if (it->it_remote_lock_mode != 0) {
+ handle.cookie = it->it_remote_lock_handle;
- CDEBUG(D_DLMTRACE, "releasing remote lock with cookie"
- LPX64" from it %p\n", handle.cookie, it);
+ CDEBUG(D_DLMTRACE,
+ "releasing remote lock with cookie %#llx from it %p\n",
+ handle.cookie, it);
ldlm_lock_decref(&handle,
- it->d.lustre.it_remote_lock_mode);
- it->d.lustre.it_remote_lock_mode = 0;
+ it->it_remote_lock_mode);
+ it->it_remote_lock_mode = 0;
}
}
}
ll_intent_drop_lock(it);
/* We are still holding extra reference on a request, need to free it */
if (it_disposition(it, DISP_ENQ_OPEN_REF))
- ptlrpc_req_finished(it->d.lustre.it_data); /* ll_file_open */
- if (it_disposition(it, DISP_ENQ_CREATE_REF)) /* create rec */
- ptlrpc_req_finished(it->d.lustre.it_data);
- if (it_disposition(it, DISP_ENQ_COMPLETE)) /* saved req from revalidate
- * to lookup */
- ptlrpc_req_finished(it->d.lustre.it_data);
-
- it->d.lustre.it_disposition = 0;
- it->d.lustre.it_data = NULL;
- EXIT;
+ ptlrpc_req_finished(it->it_request); /* ll_file_open */
+
+ if (it_disposition(it, DISP_ENQ_CREATE_REF)) /* create rec */
+ ptlrpc_req_finished(it->it_request);
+
+ it->it_disposition = 0;
+ it->it_request = NULL;
+ EXIT;
}
void ll_invalidate_aliases(struct inode *inode)
{
struct dentry *dentry;
- DECLARE_LL_D_HLIST_NODE_PTR(p);
ENTRY;
LASSERT(inode != NULL);
- CDEBUG(D_INODE, "marking dentries for ino %lu/%u(%p) invalid\n",
- inode->i_ino, inode->i_generation, inode);
+ CDEBUG(D_INODE, "marking dentries for inode "DFID"(%p) invalid\n",
+ PFID(ll_inode2fid(inode)), inode);
- ll_lock_dcache(inode);
- ll_d_hlist_for_each_entry(dentry, p, &inode->i_dentry, d_alias) {
- CDEBUG(D_DENTRY, "dentry in drop %.*s (%p) parent %p "
- "inode %p flags %d\n", dentry->d_name.len,
- dentry->d_name.name, dentry, dentry->d_parent,
+ spin_lock(&inode->i_lock);
+ hlist_for_each_entry(dentry, &inode->i_dentry, d_alias) {
+ CDEBUG(D_DENTRY,
+ "dentry in drop %pd (%p) parent %p inode %p flags %d\n",
+ dentry, dentry, dentry->d_parent,
dentry->d_inode, dentry->d_flags);
- if (unlikely(dentry == dentry->d_sb->s_root)) {
- CERROR("%s: called on root dentry=%p, fid="DFID"\n",
- ll_get_fsname(dentry->d_sb, NULL, 0),
- dentry, PFID(ll_inode2fid(inode)));
- lustre_dump_dentry(dentry, 1);
- libcfs_debug_dumpstack(NULL);
- }
-
d_lustre_invalidate(dentry, 0);
}
- ll_unlock_dcache(inode);
+ spin_unlock(&inode->i_lock);
EXIT;
}
LASSERT(it != NULL);
LASSERT(dentry != NULL);
- if (it->d.lustre.it_lock_mode && dentry->d_inode != NULL) {
+ if (it->it_lock_mode && dentry->d_inode != NULL) {
struct inode *inode = dentry->d_inode;
struct ll_sb_info *sbi = ll_i2sbi(dentry->d_inode);
- CDEBUG(D_DLMTRACE, "setting l_data to inode %p (%lu/%u)\n",
- inode, inode->i_ino, inode->i_generation);
+ CDEBUG(D_DLMTRACE, "setting l_data to inode "DFID"(%p)\n",
+ PFID(ll_inode2fid(inode)), inode);
ll_set_lock_data(sbi->ll_md_exp, inode, it, NULL);
}
}
}
-void ll_frob_intent(struct lookup_intent **itp, struct lookup_intent *deft)
+static int ll_revalidate_dentry(struct dentry *dentry,
+ unsigned int lookup_flags)
{
- struct lookup_intent *it = *itp;
-
- if (!it || it->it_op == IT_GETXATTR)
- it = *itp = deft;
-
-}
-
-int ll_revalidate_it(struct dentry *de, int lookup_flags,
- struct lookup_intent *it)
-{
- struct md_op_data *op_data;
- struct ptlrpc_request *req = NULL;
- struct lookup_intent lookup_it = { .it_op = IT_LOOKUP };
- struct obd_export *exp;
- struct inode *parent = de->d_parent->d_inode;
- int rc;
-
- ENTRY;
- CDEBUG(D_VFSTRACE, "VFS Op:name=%s,intent=%s\n", de->d_name.name,
- LL_IT2STR(it));
+ struct inode *dir = dentry->d_parent->d_inode;
- LASSERT(de != de->d_sb->s_root);
+ CDEBUG(D_VFSTRACE, "VFS Op:name=%s, flags=%u\n",
+ dentry->d_name.name, lookup_flags);
- if (de->d_inode == NULL) {
- __u64 ibits;
+ /* If this is intermediate component path lookup and we were able to get
+ * to this dentry, then its lock has not been revoked and the
+ * path component is valid. */
+ if (lookup_flags & (LOOKUP_CONTINUE | LOOKUP_PARENT))
+ return 1;
- /* We can only use negative dentries if this is stat or lookup,
- for opens and stuff we do need to query server. */
- /* If there is IT_CREAT in intent op set, then we must throw
- away this negative dentry and actually do the request to
- kernel to create whatever needs to be created (if possible)*/
- if (it && (it->it_op & IT_CREAT))
- RETURN(0);
-
- if (d_lustre_invalid(de))
- RETURN(0);
-
- ibits = MDS_INODELOCK_UPDATE;
- rc = ll_have_md_lock(parent, &ibits, LCK_MINMODE);
- GOTO(out_sa, rc);
- }
-
- /* Never execute intents for mount points.
- * Attributes will be fixed up in ll_inode_revalidate_it */
- if (d_mountpoint(de))
- GOTO(out_sa, rc = 1);
-
- exp = ll_i2mdexp(de->d_inode);
-
- OBD_FAIL_TIMEOUT(OBD_FAIL_MDC_REVALIDATE_PAUSE, 5);
- ll_frob_intent(&it, &lookup_it);
- LASSERT(it);
-
- if (it->it_op == IT_LOOKUP && !d_lustre_invalid(de))
- RETURN(1);
-
- if (it->it_op == IT_OPEN) {
- struct inode *inode = de->d_inode;
- struct ll_inode_info *lli = ll_i2info(inode);
- struct obd_client_handle **och_p;
- __u64 ibits;
-
- /*
- * We used to check for MDS_INODELOCK_OPEN here, but in fact
- * just having LOOKUP lock is enough to justify inode is the
- * same. And if inode is the same and we have suitable
- * openhandle, then there is no point in doing another OPEN RPC
- * just to throw away newly received openhandle. There are no
- * security implications too, if file owner or access mode is
- * change, LOOKUP lock is revoked.
- */
-
- if (it->it_flags & FMODE_WRITE)
- och_p = &lli->lli_mds_write_och;
- else if (it->it_flags & FMODE_EXEC)
- och_p = &lli->lli_mds_exec_och;
- else
- och_p = &lli->lli_mds_read_och;
- /* Check for the proper lock. */
- ibits = MDS_INODELOCK_LOOKUP;
- if (!ll_have_md_lock(inode, &ibits, LCK_MINMODE))
- goto do_lock;
- mutex_lock(&lli->lli_och_mutex);
- if (*och_p) { /* Everything is open already, do nothing */
- /* Originally it was idea to do not let them steal our
- * open handle from under us by (*och_usecount)++ here.
- * But in case we have the handle, but we cannot use it
- * due to later checks (e.g. O_CREAT|O_EXCL flags set),
- * nobody would decrement counter increased here. So we
- * just hope the lock won't be invalidated in between.
- * But if it would be, we'll reopen the open request to
- * MDS later during file open path. */
- mutex_unlock(&lli->lli_och_mutex);
- RETURN(1);
- }
- mutex_unlock(&lli->lli_och_mutex);
- }
-
- if (it->it_op == IT_GETATTR) {
- rc = ll_statahead_enter(parent, &de, 0);
- if (rc == 1)
- goto mark;
- else if (rc != -EAGAIN && rc != 0)
- GOTO(out, rc = 0);
- }
-
-do_lock:
- op_data = ll_prep_md_op_data(NULL, parent, de->d_inode,
- de->d_name.name, de->d_name.len,
- 0, LUSTRE_OPC_ANY, NULL);
- if (IS_ERR(op_data))
- RETURN(PTR_ERR(op_data));
-
- if (!IS_POSIXACL(parent) || !exp_connect_umask(exp))
- it->it_create_mode &= ~current_umask();
- it->it_create_mode |= M_CHECK_STALE;
- rc = md_intent_lock(exp, op_data, NULL, 0, it,
- lookup_flags,
- &req, ll_md_blocking_ast, 0);
- it->it_create_mode &= ~M_CHECK_STALE;
- ll_finish_md_op_data(op_data);
-
- /* If req is NULL, then md_intent_lock only tried to do a lock match;
- * if all was well, it will return 1 if it found locks, 0 otherwise. */
- if (req == NULL && rc >= 0) {
- if (!rc)
- goto do_lookup;
- GOTO(out, rc);
- }
-
- if (rc < 0) {
- if (rc != -ESTALE) {
- CDEBUG(D_INFO, "ll_intent_lock: rc %d : it->it_status "
- "%d\n", rc, it->d.lustre.it_status);
- }
- GOTO(out, rc = 0);
- }
-
-revalidate_finish:
- rc = ll_revalidate_it_finish(req, it, de);
- if (rc != 0) {
- if (rc != -ESTALE && rc != -ENOENT)
- ll_intent_release(it);
- GOTO(out, rc = 0);
- }
-
- if ((it->it_op & IT_OPEN) && de->d_inode &&
- !S_ISREG(de->d_inode->i_mode) &&
- !S_ISDIR(de->d_inode->i_mode)) {
- ll_release_openhandle(de, it);
- }
- rc = 1;
-
-out:
- /* We do not free request as it may be reused during following lookup
- * (see comment in mdc/mdc_locks.c::mdc_intent_lock()), request will
- * be freed in ll_lookup_it or in ll_intent_release. But if
- * request was not completed, we need to free it. (bug 5154, 9903) */
- if (req != NULL && !it_disposition(it, DISP_ENQ_COMPLETE))
- ptlrpc_req_finished(req);
- if (rc == 0) {
- /* mdt may grant layout lock for the newly created file, so
- * release the lock to avoid leaking */
- ll_intent_drop_lock(it);
- ll_invalidate_aliases(de->d_inode);
- } else {
- __u64 bits = 0;
- __u64 matched_bits = 0;
-
- CDEBUG(D_DENTRY, "revalidated dentry %.*s (%p) parent %p "
- "inode %p refc %d\n", de->d_name.len,
- de->d_name.name, de, de->d_parent, de->d_inode,
- d_refcount(de));
-
- ll_set_lock_data(exp, de->d_inode, it, &bits);
-
- /* Note: We have to match both LOOKUP and PERM lock
- * here to make sure the dentry is valid and no one
- * changing the permission.
- * But if the client connects < 2.4 server, which will
- * only grant LOOKUP lock, so we can only Match LOOKUP
- * lock for old server */
- if (exp_connect_flags(ll_i2mdexp(de->d_inode)) &&
- OBD_CONNECT_LVB_TYPE)
- matched_bits =
- MDS_INODELOCK_LOOKUP | MDS_INODELOCK_PERM;
- else
- matched_bits = MDS_INODELOCK_LOOKUP;
-
- if (((bits & matched_bits) == matched_bits) &&
- d_lustre_invalid(de))
- d_lustre_revalidate(de);
- ll_lookup_finish_locks(it, de);
- }
-
-mark:
- if (it != NULL && it->it_op == IT_GETATTR && rc > 0)
- ll_statahead_mark(parent, de);
- RETURN(rc);
-
- /*
- * This part is here to combat evil-evil race in real_lookup on 2.6
- * kernels. The race details are: We enter do_lookup() looking for some
- * name, there is nothing in dcache for this name yet and d_lookup()
- * returns NULL. We proceed to real_lookup(), and while we do this,
- * another process does open on the same file we looking up (most simple
- * reproducer), open succeeds and the dentry is added. Now back to
- * us. In real_lookup() we do d_lookup() again and suddenly find the
- * dentry, so we call d_revalidate on it, but there is no lock, so
- * without this code we would return 0, but unpatched real_lookup just
- * returns -ENOENT in such a case instead of retrying the lookup. Once
- * this is dealt with in real_lookup(), all of this ugly mess can go and
- * we can just check locks in ->d_revalidate without doing any RPCs
- * ever.
- */
-do_lookup:
- if (it != &lookup_it) {
- /* MDS_INODELOCK_UPDATE needed for IT_GETATTR case. */
- if (it->it_op == IT_GETATTR)
- lookup_it.it_op = IT_GETATTR;
- ll_lookup_finish_locks(it, de);
- it = &lookup_it;
- }
-
- /* Do real lookup here. */
- op_data = ll_prep_md_op_data(NULL, parent, NULL, de->d_name.name,
- de->d_name.len, 0, (it->it_op & IT_CREAT ?
- LUSTRE_OPC_CREATE :
- LUSTRE_OPC_ANY), NULL);
- if (IS_ERR(op_data))
- RETURN(PTR_ERR(op_data));
-
- rc = md_intent_lock(exp, op_data, NULL, 0, it, 0, &req,
- ll_md_blocking_ast, 0);
- if (rc >= 0) {
- struct mdt_body *mdt_body;
- struct lu_fid fid = {.f_seq = 0, .f_oid = 0, .f_ver = 0};
- mdt_body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
-
- if (de->d_inode)
- fid = *ll_inode2fid(de->d_inode);
-
- /* see if we got same inode, if not - return error */
- if (lu_fid_eq(&fid, &mdt_body->fid1)) {
- ll_finish_md_op_data(op_data);
- op_data = NULL;
- goto revalidate_finish;
- }
- ll_intent_release(it);
- }
- ll_finish_md_op_data(op_data);
- GOTO(out, rc = 0);
-
-out_sa:
- /*
- * For rc == 1 case, should not return directly to prevent losing
- * statahead windows; for rc == 0 case, the "lookup" will be done later.
- */
- if (it != NULL && it->it_op == IT_GETATTR && rc == 1)
- ll_statahead_enter(parent, &de, 1);
- goto mark;
-}
-
-#ifdef HAVE_IOP_ATOMIC_OPEN
-/*
- * Always trust cached dentries. Update statahead window if necessary.
- */
-int ll_revalidate_nd(struct dentry *dentry, unsigned int flags)
-{
- struct inode *parent = dentry->d_parent->d_inode;
- int unplug = 0;
-
- ENTRY;
- CDEBUG(D_VFSTRACE, "VFS Op:name=%s,flags=%u\n",
- dentry->d_name.name, flags);
-
- if (!(flags & (LOOKUP_PARENT|LOOKUP_OPEN|LOOKUP_CREATE)) &&
- ll_need_statahead(parent, dentry) > 0) {
- if (flags & LOOKUP_RCU)
- RETURN(-ECHILD);
-
- if (dentry->d_inode == NULL)
- unplug = 1;
- do_statahead_enter(parent, &dentry, unplug);
- ll_statahead_mark(parent, dentry);
- }
-
- RETURN(1);
-}
-
-#else /* !HAVE_IOP_ATOMIC_OPEN */
-int ll_revalidate_nd(struct dentry *dentry, struct nameidata *nd)
-{
- int rc;
- ENTRY;
-
-#ifndef HAVE_DCACHE_LOCK
- /* kernel >= 2.6.38 supports rcu-walk, but lustre doesn't. */
- if (nd && (nd->flags & LOOKUP_RCU))
- return -ECHILD;
+ /* Symlink - always valid as long as the dentry was found */
+#ifdef HAVE_IOP_GET_LINK
+ if (dentry->d_inode && dentry->d_inode->i_op->get_link)
+#else
+ if (dentry->d_inode && dentry->d_inode->i_op->follow_link)
#endif
+ return 1;
+
+ /*
+ * VFS warns us that this is the second go around and previous
+ * operation failed (most likely open|creat), so this time
+ * we better talk to the server via the lookup path by name,
+ * not by fid.
+ */
+ if (lookup_flags & LOOKUP_REVAL)
+ return 0;
+
+ if (lookup_flags & LOOKUP_RCU)
+ return -ECHILD;
- if (nd && !(nd->flags & (LOOKUP_CONTINUE|LOOKUP_PARENT))) {
- struct lookup_intent *it;
-
- it = ll_convert_intent(&nd->intent.open, nd->flags);
- if (IS_ERR(it))
- RETURN(0);
-
- if (it->it_op == (IT_OPEN|IT_CREAT) &&
- nd->intent.open.flags & O_EXCL) {
- CDEBUG(D_VFSTRACE, "create O_EXCL, returning 0\n");
- rc = 0;
- goto out_it;
- }
-
- rc = ll_revalidate_it(dentry, nd->flags, it);
-
- if (rc && (nd->flags & LOOKUP_OPEN) &&
- it_disposition(it, DISP_OPEN_OPEN)) {/*Open*/
-// XXX Code duplication with ll_lookup_nd
- if (S_ISFIFO(dentry->d_inode->i_mode)) {
- // We cannot call open here as it would
- // deadlock.
- ptlrpc_req_finished(
- (struct ptlrpc_request *)
- it->d.lustre.it_data);
- } else {
- struct file *filp;
-
- nd->intent.open.file->private_data = it;
- filp = lookup_instantiate_filp(nd, dentry,NULL);
- if (IS_ERR(filp))
- rc = PTR_ERR(filp);
- }
- }
- if (!rc && (nd->flags & LOOKUP_CREATE) &&
- it_disposition(it, DISP_OPEN_CREATE)) {
- /* We created something but we may only return
- * negative dentry here, so save request in dentry,
- * if lookup will be called later on, it will
- * pick the request, otherwise it would be freed
- * with dentry */
- ll_d2d(dentry)->lld_it = it;
- it = NULL; /* avoid freeing */
- }
-
-out_it:
- if (it) {
- ll_intent_release(it);
- OBD_FREE(it, sizeof(*it));
- }
- } else {
- rc = ll_revalidate_it(dentry, 0, NULL);
- }
-
- RETURN(rc);
-}
-#endif /* HAVE_IOP_ATOMIC_OPEN */
+ if (dentry_may_statahead(dir, dentry))
+ ll_revalidate_statahead(dir, &dentry, dentry->d_inode == NULL);
-void ll_d_iput(struct dentry *de, struct inode *inode)
-{
- LASSERT(inode);
- if (!find_cbdata(inode))
- clear_nlink(inode);
- iput(inode);
+ return 1;
}
-struct dentry_operations ll_d_ops = {
- .d_revalidate = ll_revalidate_nd,
+const struct dentry_operations ll_d_ops = {
+ .d_revalidate = ll_revalidate_dentry,
.d_release = ll_release,
.d_delete = ll_ddelete,
- .d_iput = ll_d_iput,
.d_compare = ll_dcompare,
};
git://git.whamcloud.com / fs / lustre-release.git / blobdiff