static int nfs_do_call_unlink(struct dentry *parent, struct inode *dir, struct nfs_unlinkdata *data) { struct rpc_message msg = { .rpc_argp = &data->args, .rpc_resp = &data->res, .rpc_cred = data->cred, }; struct rpc_task_setup task_setup_data = { .rpc_message = &msg, .callback_ops = &nfs_unlink_ops, .callback_data = data, .workqueue = nfsiod_workqueue, .flags = RPC_TASK_ASYNC, }; struct rpc_task *task; struct dentry *alias; alias = d_lookup(parent, &data->args.name); if (alias != NULL) { int ret = 0; /* * Hey, we raced with lookup... See if we need to transfer * the sillyrename information to the aliased dentry. */ nfs_free_dname(data); spin_lock(&alias->d_lock); if (alias->d_inode != NULL && !(alias->d_flags & DCACHE_NFSFS_RENAMED)) { alias->d_fsdata = data; alias->d_flags |= DCACHE_NFSFS_RENAMED; ret = 1; } spin_unlock(&alias->d_lock); nfs_dec_sillycount(dir); dput(alias); return ret; } data->dir = igrab(dir); if (!data->dir) { nfs_dec_sillycount(dir); return 0; } nfs_sb_active(dir->i_sb); data->args.fh = NFS_FH(dir); nfs_fattr_init(data->res.dir_attr); NFS_PROTO(dir)->unlink_setup(&msg, dir); task_setup_data.rpc_client = NFS_CLIENT(dir); task = rpc_run_task(&task_setup_data); if (!IS_ERR(task)) rpc_put_task(task); return 1; } static int nfs_call_unlink(struct dentry *dentry, struct nfs_unlinkdata *data) { struct dentry *parent; struct inode *dir; int ret = 0; parent = dget_parent(dentry); if (parent == NULL) goto out_free; dir = parent->d_inode; if (nfs_copy_dname(dentry, data) != 0) goto out_dput; /* Non-exclusive lock protects against concurrent lookup() calls */ spin_lock(&dir->i_lock); if (atomic_inc_not_zero(&NFS_I(dir)->silly_count) == 0) { /* Deferred delete */ hlist_add_head(&data->list, &NFS_I(dir)->silly_list); spin_unlock(&dir->i_lock); ret = 1; goto out_dput; } spin_unlock(&dir->i_lock); ret = nfs_do_call_unlink(parent, dir, data); out_dput: dput(parent); out_free: return ret; } void nfs_block_sillyrename(struct dentry *dentry) { struct nfs_inode *nfsi = NFS_I(dentry->d_inode); wait_event(nfsi->waitqueue, atomic_cmpxchg(&nfsi->silly_count, 1, 0) == 1); } void nfs_unblock_sillyrename(struct dentry *dentry) { struct inode *dir = dentry->d_inode; struct nfs_inode *nfsi = NFS_I(dir); struct nfs_unlinkdata *data; atomic_inc(&nfsi->silly_count); spin_lock(&dir->i_lock); while (!hlist_empty(&nfsi->silly_list)) { if (!atomic_inc_not_zero(&nfsi->silly_count)) break; data = hlist_entry(nfsi->silly_list.first, struct nfs_unlinkdata, list); hlist_del(&data->list); spin_unlock(&dir->i_lock); if (nfs_do_call_unlink(dentry, dir, data) == 0) nfs_free_unlinkdata(data); spin_lock(&dir->i_lock); } spin_unlock(&dir->i_lock); } int nfs_async_unlink(struct inode *dir, struct dentry *dentry) { struct nfs_unlinkdata *data; int status = -ENOMEM; data = kzalloc(sizeof(*data), GFP_KERNEL); if (data == NULL) goto out; data->cred = rpc_lookup_cred(); if (IS_ERR(data->cred)) { status = PTR_ERR(data->cred); goto out_free; } data->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE; data->res.dir_attr = &data->dir_attr; status = -EBUSY; spin_lock(&dentry->d_lock); if (dentry->d_flags & DCACHE_NFSFS_RENAMED) goto out_unlock; dentry->d_flags |= DCACHE_NFSFS_RENAMED; dentry->d_fsdata = data; spin_unlock(&dentry->d_lock); return 0; out_unlock: spin_unlock(&dentry->d_lock); put_rpccred(data->cred); out_free: kfree(data); out: return status; } void nfs_complete_unlink(struct dentry *dentry, struct inode *inode) { struct nfs_unlinkdata *data = NULL; spin_lock(&dentry->d_lock); if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { dentry->d_flags &= ~DCACHE_NFSFS_RENAMED; data = dentry->d_fsdata; } spin_unlock(&dentry->d_lock); if (data != NULL && (NFS_STALE(inode) || !nfs_call_unlink(dentry, data))) nfs_free_unlinkdata(data); }
static int nfs_do_call_unlink(struct dentry *parent, struct inode *dir, struct nfs_unlinkdata *data) { struct rpc_message msg = { .rpc_argp = &data->args, .rpc_resp = &data->res, .rpc_cred = data->cred, }; struct rpc_task_setup task_setup_data = { .rpc_message = &msg, .callback_ops = &nfs_unlink_ops, .callback_data = data, .workqueue = nfsiod_workqueue, .flags = RPC_TASK_ASYNC, }; struct rpc_task *task; struct dentry *alias; alias = d_lookup(parent, &data->args.name); if (alias != NULL) { int ret; void *devname_garbage = NULL; /* * Hey, we raced with lookup... See if we need to transfer * the sillyrename information to the aliased dentry. */ nfs_free_dname(data); ret = nfs_copy_dname(alias, data); spin_lock(&alias->d_lock); if (ret == 0 && alias->d_inode != NULL && !(alias->d_flags & DCACHE_NFSFS_RENAMED)) { devname_garbage = alias->d_fsdata; alias->d_fsdata = data; alias->d_flags |= DCACHE_NFSFS_RENAMED; ret = 1; } else ret = 0; spin_unlock(&alias->d_lock); nfs_dec_sillycount(dir); dput(alias); /* * If we'd displaced old cached devname, free it. At that * point dentry is definitely not a root, so we won't need * that anymore. */ kfree(devname_garbage); return ret; } data->dir = igrab(dir); if (!data->dir) { nfs_dec_sillycount(dir); return 0; } nfs_sb_active(dir->i_sb); data->args.fh = NFS_FH(dir); nfs_fattr_init(data->res.dir_attr); NFS_PROTO(dir)->unlink_setup(&msg, dir); task_setup_data.rpc_client = NFS_CLIENT(dir); task = rpc_run_task(&task_setup_data); if (!IS_ERR(task)) rpc_put_task_async(task); return 1; } static int nfs_call_unlink(struct dentry *dentry, struct nfs_unlinkdata *data) { struct dentry *parent; struct inode *dir; int ret = 0; parent = dget_parent(dentry); if (parent == NULL) goto out_free; dir = parent->d_inode; /* Non-exclusive lock protects against concurrent lookup() calls */ spin_lock(&dir->i_lock); if (atomic_inc_not_zero(&NFS_I(dir)->silly_count) == 0) { /* Deferred delete */ hlist_add_head(&data->list, &NFS_I(dir)->silly_list); spin_unlock(&dir->i_lock); ret = 1; goto out_dput; } spin_unlock(&dir->i_lock); ret = nfs_do_call_unlink(parent, dir, data); out_dput: dput(parent); out_free: return ret; } void nfs_block_sillyrename(struct dentry *dentry) { struct nfs_inode *nfsi = NFS_I(dentry->d_inode); wait_event(nfsi->waitqueue, atomic_cmpxchg(&nfsi->silly_count, 1, 0) == 1); } void nfs_unblock_sillyrename(struct dentry *dentry) { struct inode *dir = dentry->d_inode; struct nfs_inode *nfsi = NFS_I(dir); struct nfs_unlinkdata *data; atomic_inc(&nfsi->silly_count); spin_lock(&dir->i_lock); while (!hlist_empty(&nfsi->silly_list)) { if (!atomic_inc_not_zero(&nfsi->silly_count)) break; data = hlist_entry(nfsi->silly_list.first, struct nfs_unlinkdata, list); hlist_del(&data->list); spin_unlock(&dir->i_lock); if (nfs_do_call_unlink(dentry, dir, data) == 0) nfs_free_unlinkdata(data); spin_lock(&dir->i_lock); } spin_unlock(&dir->i_lock); } /** * nfs_async_unlink - asynchronous unlinking of a file * @dir: parent directory of dentry * @dentry: dentry to unlink */ static int nfs_async_unlink(struct inode *dir, struct dentry *dentry) { struct nfs_unlinkdata *data; int status = -ENOMEM; void *devname_garbage = NULL; data = kzalloc(sizeof(*data), GFP_KERNEL); if (data == NULL) goto out; data->cred = rpc_lookup_cred(); if (IS_ERR(data->cred)) { status = PTR_ERR(data->cred); goto out_free; } data->res.dir_attr = &data->dir_attr; status = -EBUSY; spin_lock(&dentry->d_lock); if (dentry->d_flags & DCACHE_NFSFS_RENAMED) goto out_unlock; dentry->d_flags |= DCACHE_NFSFS_RENAMED; devname_garbage = dentry->d_fsdata; dentry->d_fsdata = data; spin_unlock(&dentry->d_lock); /* * If we'd displaced old cached devname, free it. At that * point dentry is definitely not a root, so we won't need * that anymore. */ if (devname_garbage) kfree(devname_garbage); return 0; out_unlock: spin_unlock(&dentry->d_lock); put_rpccred(data->cred); out_free: kfree(data); out: return status; } /** * nfs_complete_unlink - Initialize completion of the sillydelete * @dentry: dentry to delete * @inode: inode * * Since we're most likely to be called by dentry_iput(), we * only use the dentry to find the sillydelete. We then copy the name * into the qstr. */ void nfs_complete_unlink(struct dentry *dentry, struct inode *inode) { struct nfs_unlinkdata *data = NULL; spin_lock(&dentry->d_lock); if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { dentry->d_flags &= ~DCACHE_NFSFS_RENAMED; data = dentry->d_fsdata; dentry->d_fsdata = NULL; } spin_unlock(&dentry->d_lock); if (data != NULL && (NFS_STALE(inode) || !nfs_call_unlink(dentry, data))) nfs_free_unlinkdata(data); } /* Cancel a queued async unlink. Called when a sillyrename run fails. */ static void nfs_cancel_async_unlink(struct dentry *dentry) { spin_lock(&dentry->d_lock); if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { struct nfs_unlinkdata *data = dentry->d_fsdata; dentry->d_flags &= ~DCACHE_NFSFS_RENAMED; dentry->d_fsdata = NULL; spin_unlock(&dentry->d_lock); nfs_free_unlinkdata(data); return; } spin_unlock(&dentry->d_lock); }
static int nfs_do_call_unlink(struct dentry *parent, struct inode *dir, struct nfs_unlinkdata *data) { struct rpc_message msg = { .rpc_argp = &data->args, .rpc_resp = &data->res, .rpc_cred = data->cred, }; struct rpc_task_setup task_setup_data = { .rpc_message = &msg, .callback_ops = &nfs_unlink_ops, .callback_data = data, .workqueue = nfsiod_workqueue, .flags = RPC_TASK_ASYNC, }; struct rpc_task *task; struct dentry *alias; alias = d_lookup(parent, &data->args.name); if (alias != NULL) { int ret; void *devname_garbage = NULL; nfs_free_dname(data); ret = nfs_copy_dname(alias, data); spin_lock(&alias->d_lock); if (ret == 0 && alias->d_inode != NULL && !(alias->d_flags & DCACHE_NFSFS_RENAMED)) { devname_garbage = alias->d_fsdata; alias->d_fsdata = data; alias->d_flags |= DCACHE_NFSFS_RENAMED; ret = 1; } else ret = 0; spin_unlock(&alias->d_lock); nfs_dec_sillycount(dir); dput(alias); kfree(devname_garbage); return ret; } data->dir = igrab(dir); if (!data->dir) { nfs_dec_sillycount(dir); return 0; } nfs_sb_active(dir->i_sb); data->args.fh = NFS_FH(dir); nfs_fattr_init(data->res.dir_attr); NFS_PROTO(dir)->unlink_setup(&msg, dir); task_setup_data.rpc_client = NFS_CLIENT(dir); task = rpc_run_task(&task_setup_data); if (!IS_ERR(task)) rpc_put_task_async(task); return 1; } static int nfs_call_unlink(struct dentry *dentry, struct nfs_unlinkdata *data) { struct dentry *parent; struct inode *dir; int ret = 0; parent = dget_parent(dentry); if (parent == NULL) goto out_free; dir = parent->d_inode; spin_lock(&dir->i_lock); if (atomic_inc_not_zero(&NFS_I(dir)->silly_count) == 0) { hlist_add_head(&data->list, &NFS_I(dir)->silly_list); spin_unlock(&dir->i_lock); ret = 1; goto out_dput; } spin_unlock(&dir->i_lock); ret = nfs_do_call_unlink(parent, dir, data); out_dput: dput(parent); out_free: return ret; } void nfs_block_sillyrename(struct dentry *dentry) { struct nfs_inode *nfsi = NFS_I(dentry->d_inode); wait_event(nfsi->waitqueue, atomic_cmpxchg(&nfsi->silly_count, 1, 0) == 1); } void nfs_unblock_sillyrename(struct dentry *dentry) { struct inode *dir = dentry->d_inode; struct nfs_inode *nfsi = NFS_I(dir); struct nfs_unlinkdata *data; atomic_inc(&nfsi->silly_count); spin_lock(&dir->i_lock); while (!hlist_empty(&nfsi->silly_list)) { if (!atomic_inc_not_zero(&nfsi->silly_count)) break; data = hlist_entry(nfsi->silly_list.first, struct nfs_unlinkdata, list); hlist_del(&data->list); spin_unlock(&dir->i_lock); if (nfs_do_call_unlink(dentry, dir, data) == 0) nfs_free_unlinkdata(data); spin_lock(&dir->i_lock); } spin_unlock(&dir->i_lock); } static int nfs_async_unlink(struct inode *dir, struct dentry *dentry) { struct nfs_unlinkdata *data; int status = -ENOMEM; void *devname_garbage = NULL; data = kzalloc(sizeof(*data), GFP_KERNEL); if (data == NULL) goto out; data->cred = rpc_lookup_cred(); if (IS_ERR(data->cred)) { status = PTR_ERR(data->cred); goto out_free; } data->res.dir_attr = &data->dir_attr; status = -EBUSY; spin_lock(&dentry->d_lock); if (dentry->d_flags & DCACHE_NFSFS_RENAMED) goto out_unlock; dentry->d_flags |= DCACHE_NFSFS_RENAMED; devname_garbage = dentry->d_fsdata; dentry->d_fsdata = data; spin_unlock(&dentry->d_lock); if (devname_garbage) kfree(devname_garbage); return 0; out_unlock: spin_unlock(&dentry->d_lock); put_rpccred(data->cred); out_free: kfree(data); out: return status; } void nfs_complete_unlink(struct dentry *dentry, struct inode *inode) { struct nfs_unlinkdata *data = NULL; spin_lock(&dentry->d_lock); if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { dentry->d_flags &= ~DCACHE_NFSFS_RENAMED; data = dentry->d_fsdata; dentry->d_fsdata = NULL; } spin_unlock(&dentry->d_lock); if (data != NULL && (NFS_STALE(inode) || !nfs_call_unlink(dentry, data))) nfs_free_unlinkdata(data); } static void nfs_cancel_async_unlink(struct dentry *dentry) { spin_lock(&dentry->d_lock); if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { struct nfs_unlinkdata *data = dentry->d_fsdata; dentry->d_flags &= ~DCACHE_NFSFS_RENAMED; dentry->d_fsdata = NULL; spin_unlock(&dentry->d_lock); nfs_free_unlinkdata(data); return; } spin_unlock(&dentry->d_lock); }