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- // SPDX-License-Identifier: GPL-2.0-or-later
- /* dir.c: AFS filesystem directory handling
- *
- * Copyright (C) 2002, 2018 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells ([email protected])
- */
- #include <linux/kernel.h>
- #include <linux/fs.h>
- #include <linux/namei.h>
- #include <linux/pagemap.h>
- #include <linux/swap.h>
- #include <linux/ctype.h>
- #include <linux/sched.h>
- #include <linux/task_io_accounting_ops.h>
- #include "internal.h"
- #include "afs_fs.h"
- #include "xdr_fs.h"
- static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
- unsigned int flags);
- static int afs_dir_open(struct inode *inode, struct file *file);
- static int afs_readdir(struct file *file, struct dir_context *ctx);
- static int afs_d_revalidate(struct dentry *dentry, unsigned int flags);
- static int afs_d_delete(const struct dentry *dentry);
- static void afs_d_iput(struct dentry *dentry, struct inode *inode);
- static bool afs_lookup_one_filldir(struct dir_context *ctx, const char *name, int nlen,
- loff_t fpos, u64 ino, unsigned dtype);
- static bool afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen,
- loff_t fpos, u64 ino, unsigned dtype);
- static int afs_create(struct user_namespace *mnt_userns, struct inode *dir,
- struct dentry *dentry, umode_t mode, bool excl);
- static int afs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
- struct dentry *dentry, umode_t mode);
- static int afs_rmdir(struct inode *dir, struct dentry *dentry);
- static int afs_unlink(struct inode *dir, struct dentry *dentry);
- static int afs_link(struct dentry *from, struct inode *dir,
- struct dentry *dentry);
- static int afs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
- struct dentry *dentry, const char *content);
- static int afs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
- struct dentry *old_dentry, struct inode *new_dir,
- struct dentry *new_dentry, unsigned int flags);
- static bool afs_dir_release_folio(struct folio *folio, gfp_t gfp_flags);
- static void afs_dir_invalidate_folio(struct folio *folio, size_t offset,
- size_t length);
- static bool afs_dir_dirty_folio(struct address_space *mapping,
- struct folio *folio)
- {
- BUG(); /* This should never happen. */
- }
- const struct file_operations afs_dir_file_operations = {
- .open = afs_dir_open,
- .release = afs_release,
- .iterate_shared = afs_readdir,
- .lock = afs_lock,
- .llseek = generic_file_llseek,
- };
- const struct inode_operations afs_dir_inode_operations = {
- .create = afs_create,
- .lookup = afs_lookup,
- .link = afs_link,
- .unlink = afs_unlink,
- .symlink = afs_symlink,
- .mkdir = afs_mkdir,
- .rmdir = afs_rmdir,
- .rename = afs_rename,
- .permission = afs_permission,
- .getattr = afs_getattr,
- .setattr = afs_setattr,
- };
- const struct address_space_operations afs_dir_aops = {
- .dirty_folio = afs_dir_dirty_folio,
- .release_folio = afs_dir_release_folio,
- .invalidate_folio = afs_dir_invalidate_folio,
- };
- const struct dentry_operations afs_fs_dentry_operations = {
- .d_revalidate = afs_d_revalidate,
- .d_delete = afs_d_delete,
- .d_release = afs_d_release,
- .d_automount = afs_d_automount,
- .d_iput = afs_d_iput,
- };
- struct afs_lookup_one_cookie {
- struct dir_context ctx;
- struct qstr name;
- bool found;
- struct afs_fid fid;
- };
- struct afs_lookup_cookie {
- struct dir_context ctx;
- struct qstr name;
- bool found;
- bool one_only;
- unsigned short nr_fids;
- struct afs_fid fids[50];
- };
- /*
- * Drop the refs that we're holding on the folios we were reading into. We've
- * got refs on the first nr_pages pages.
- */
- static void afs_dir_read_cleanup(struct afs_read *req)
- {
- struct address_space *mapping = req->vnode->netfs.inode.i_mapping;
- struct folio *folio;
- pgoff_t last = req->nr_pages - 1;
- XA_STATE(xas, &mapping->i_pages, 0);
- if (unlikely(!req->nr_pages))
- return;
- rcu_read_lock();
- xas_for_each(&xas, folio, last) {
- if (xas_retry(&xas, folio))
- continue;
- BUG_ON(xa_is_value(folio));
- ASSERTCMP(folio_file_mapping(folio), ==, mapping);
- folio_put(folio);
- }
- rcu_read_unlock();
- }
- /*
- * check that a directory folio is valid
- */
- static bool afs_dir_check_folio(struct afs_vnode *dvnode, struct folio *folio,
- loff_t i_size)
- {
- union afs_xdr_dir_block *block;
- size_t offset, size;
- loff_t pos;
- /* Determine how many magic numbers there should be in this folio, but
- * we must take care because the directory may change size under us.
- */
- pos = folio_pos(folio);
- if (i_size <= pos)
- goto checked;
- size = min_t(loff_t, folio_size(folio), i_size - pos);
- for (offset = 0; offset < size; offset += sizeof(*block)) {
- block = kmap_local_folio(folio, offset);
- if (block->hdr.magic != AFS_DIR_MAGIC) {
- printk("kAFS: %s(%lx): [%llx] bad magic %zx/%zx is %04hx\n",
- __func__, dvnode->netfs.inode.i_ino,
- pos, offset, size, ntohs(block->hdr.magic));
- trace_afs_dir_check_failed(dvnode, pos + offset, i_size);
- kunmap_local(block);
- trace_afs_file_error(dvnode, -EIO, afs_file_error_dir_bad_magic);
- goto error;
- }
- /* Make sure each block is NUL terminated so we can reasonably
- * use string functions on it. The filenames in the folio
- * *should* be NUL-terminated anyway.
- */
- ((u8 *)block)[AFS_DIR_BLOCK_SIZE - 1] = 0;
- kunmap_local(block);
- }
- checked:
- afs_stat_v(dvnode, n_read_dir);
- return true;
- error:
- return false;
- }
- /*
- * Dump the contents of a directory.
- */
- static void afs_dir_dump(struct afs_vnode *dvnode, struct afs_read *req)
- {
- union afs_xdr_dir_block *block;
- struct address_space *mapping = dvnode->netfs.inode.i_mapping;
- struct folio *folio;
- pgoff_t last = req->nr_pages - 1;
- size_t offset, size;
- XA_STATE(xas, &mapping->i_pages, 0);
- pr_warn("DIR %llx:%llx f=%llx l=%llx al=%llx\n",
- dvnode->fid.vid, dvnode->fid.vnode,
- req->file_size, req->len, req->actual_len);
- pr_warn("DIR %llx %x %zx %zx\n",
- req->pos, req->nr_pages,
- req->iter->iov_offset, iov_iter_count(req->iter));
- xas_for_each(&xas, folio, last) {
- if (xas_retry(&xas, folio))
- continue;
- BUG_ON(folio_file_mapping(folio) != mapping);
- size = min_t(loff_t, folio_size(folio), req->actual_len - folio_pos(folio));
- for (offset = 0; offset < size; offset += sizeof(*block)) {
- block = kmap_local_folio(folio, offset);
- pr_warn("[%02lx] %32phN\n", folio_index(folio) + offset, block);
- kunmap_local(block);
- }
- }
- }
- /*
- * Check all the blocks in a directory. All the folios are held pinned.
- */
- static int afs_dir_check(struct afs_vnode *dvnode, struct afs_read *req)
- {
- struct address_space *mapping = dvnode->netfs.inode.i_mapping;
- struct folio *folio;
- pgoff_t last = req->nr_pages - 1;
- int ret = 0;
- XA_STATE(xas, &mapping->i_pages, 0);
- if (unlikely(!req->nr_pages))
- return 0;
- rcu_read_lock();
- xas_for_each(&xas, folio, last) {
- if (xas_retry(&xas, folio))
- continue;
- BUG_ON(folio_file_mapping(folio) != mapping);
- if (!afs_dir_check_folio(dvnode, folio, req->actual_len)) {
- afs_dir_dump(dvnode, req);
- ret = -EIO;
- break;
- }
- }
- rcu_read_unlock();
- return ret;
- }
- /*
- * open an AFS directory file
- */
- static int afs_dir_open(struct inode *inode, struct file *file)
- {
- _enter("{%lu}", inode->i_ino);
- BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
- BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
- if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags))
- return -ENOENT;
- return afs_open(inode, file);
- }
- /*
- * Read the directory into the pagecache in one go, scrubbing the previous
- * contents. The list of folios is returned, pinning them so that they don't
- * get reclaimed during the iteration.
- */
- static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key)
- __acquires(&dvnode->validate_lock)
- {
- struct address_space *mapping = dvnode->netfs.inode.i_mapping;
- struct afs_read *req;
- loff_t i_size;
- int nr_pages, i;
- int ret;
- loff_t remote_size = 0;
- _enter("");
- req = kzalloc(sizeof(*req), GFP_KERNEL);
- if (!req)
- return ERR_PTR(-ENOMEM);
- refcount_set(&req->usage, 1);
- req->vnode = dvnode;
- req->key = key_get(key);
- req->cleanup = afs_dir_read_cleanup;
- expand:
- i_size = i_size_read(&dvnode->netfs.inode);
- if (i_size < remote_size)
- i_size = remote_size;
- if (i_size < 2048) {
- ret = afs_bad(dvnode, afs_file_error_dir_small);
- goto error;
- }
- if (i_size > 2048 * 1024) {
- trace_afs_file_error(dvnode, -EFBIG, afs_file_error_dir_big);
- ret = -EFBIG;
- goto error;
- }
- _enter("%llu", i_size);
- nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE;
- req->actual_len = i_size; /* May change */
- req->len = nr_pages * PAGE_SIZE; /* We can ask for more than there is */
- req->data_version = dvnode->status.data_version; /* May change */
- iov_iter_xarray(&req->def_iter, ITER_DEST, &dvnode->netfs.inode.i_mapping->i_pages,
- 0, i_size);
- req->iter = &req->def_iter;
- /* Fill in any gaps that we might find where the memory reclaimer has
- * been at work and pin all the folios. If there are any gaps, we will
- * need to reread the entire directory contents.
- */
- i = req->nr_pages;
- while (i < nr_pages) {
- struct folio *folio;
- folio = filemap_get_folio(mapping, i);
- if (!folio) {
- if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
- afs_stat_v(dvnode, n_inval);
- ret = -ENOMEM;
- folio = __filemap_get_folio(mapping,
- i, FGP_LOCK | FGP_CREAT,
- mapping->gfp_mask);
- if (!folio)
- goto error;
- folio_attach_private(folio, (void *)1);
- folio_unlock(folio);
- }
- req->nr_pages += folio_nr_pages(folio);
- i += folio_nr_pages(folio);
- }
- /* If we're going to reload, we need to lock all the pages to prevent
- * races.
- */
- ret = -ERESTARTSYS;
- if (down_read_killable(&dvnode->validate_lock) < 0)
- goto error;
- if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
- goto success;
- up_read(&dvnode->validate_lock);
- if (down_write_killable(&dvnode->validate_lock) < 0)
- goto error;
- if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) {
- trace_afs_reload_dir(dvnode);
- ret = afs_fetch_data(dvnode, req);
- if (ret < 0)
- goto error_unlock;
- task_io_account_read(PAGE_SIZE * req->nr_pages);
- if (req->len < req->file_size) {
- /* The content has grown, so we need to expand the
- * buffer.
- */
- up_write(&dvnode->validate_lock);
- remote_size = req->file_size;
- goto expand;
- }
- /* Validate the data we just read. */
- ret = afs_dir_check(dvnode, req);
- if (ret < 0)
- goto error_unlock;
- // TODO: Trim excess pages
- set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags);
- }
- downgrade_write(&dvnode->validate_lock);
- success:
- return req;
- error_unlock:
- up_write(&dvnode->validate_lock);
- error:
- afs_put_read(req);
- _leave(" = %d", ret);
- return ERR_PTR(ret);
- }
- /*
- * deal with one block in an AFS directory
- */
- static int afs_dir_iterate_block(struct afs_vnode *dvnode,
- struct dir_context *ctx,
- union afs_xdr_dir_block *block,
- unsigned blkoff)
- {
- union afs_xdr_dirent *dire;
- unsigned offset, next, curr, nr_slots;
- size_t nlen;
- int tmp;
- _enter("%llx,%x", ctx->pos, blkoff);
- curr = (ctx->pos - blkoff) / sizeof(union afs_xdr_dirent);
- /* walk through the block, an entry at a time */
- for (offset = (blkoff == 0 ? AFS_DIR_RESV_BLOCKS0 : AFS_DIR_RESV_BLOCKS);
- offset < AFS_DIR_SLOTS_PER_BLOCK;
- offset = next
- ) {
- /* skip entries marked unused in the bitmap */
- if (!(block->hdr.bitmap[offset / 8] &
- (1 << (offset % 8)))) {
- _debug("ENT[%zu.%u]: unused",
- blkoff / sizeof(union afs_xdr_dir_block), offset);
- next = offset + 1;
- if (offset >= curr)
- ctx->pos = blkoff +
- next * sizeof(union afs_xdr_dirent);
- continue;
- }
- /* got a valid entry */
- dire = &block->dirents[offset];
- nlen = strnlen(dire->u.name,
- sizeof(*block) -
- offset * sizeof(union afs_xdr_dirent));
- if (nlen > AFSNAMEMAX - 1) {
- _debug("ENT[%zu]: name too long (len %u/%zu)",
- blkoff / sizeof(union afs_xdr_dir_block),
- offset, nlen);
- return afs_bad(dvnode, afs_file_error_dir_name_too_long);
- }
- _debug("ENT[%zu.%u]: %s %zu \"%s\"",
- blkoff / sizeof(union afs_xdr_dir_block), offset,
- (offset < curr ? "skip" : "fill"),
- nlen, dire->u.name);
- nr_slots = afs_dir_calc_slots(nlen);
- next = offset + nr_slots;
- if (next > AFS_DIR_SLOTS_PER_BLOCK) {
- _debug("ENT[%zu.%u]:"
- " %u extends beyond end dir block"
- " (len %zu)",
- blkoff / sizeof(union afs_xdr_dir_block),
- offset, next, nlen);
- return afs_bad(dvnode, afs_file_error_dir_over_end);
- }
- /* Check that the name-extension dirents are all allocated */
- for (tmp = 1; tmp < nr_slots; tmp++) {
- unsigned int ix = offset + tmp;
- if (!(block->hdr.bitmap[ix / 8] & (1 << (ix % 8)))) {
- _debug("ENT[%zu.u]:"
- " %u unmarked extension (%u/%u)",
- blkoff / sizeof(union afs_xdr_dir_block),
- offset, tmp, nr_slots);
- return afs_bad(dvnode, afs_file_error_dir_unmarked_ext);
- }
- }
- /* skip if starts before the current position */
- if (offset < curr) {
- if (next > curr)
- ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent);
- continue;
- }
- /* found the next entry */
- if (!dir_emit(ctx, dire->u.name, nlen,
- ntohl(dire->u.vnode),
- (ctx->actor == afs_lookup_filldir ||
- ctx->actor == afs_lookup_one_filldir)?
- ntohl(dire->u.unique) : DT_UNKNOWN)) {
- _leave(" = 0 [full]");
- return 0;
- }
- ctx->pos = blkoff + next * sizeof(union afs_xdr_dirent);
- }
- _leave(" = 1 [more]");
- return 1;
- }
- /*
- * iterate through the data blob that lists the contents of an AFS directory
- */
- static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx,
- struct key *key, afs_dataversion_t *_dir_version)
- {
- struct afs_vnode *dvnode = AFS_FS_I(dir);
- union afs_xdr_dir_block *dblock;
- struct afs_read *req;
- struct folio *folio;
- unsigned offset, size;
- int ret;
- _enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos);
- if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) {
- _leave(" = -ESTALE");
- return -ESTALE;
- }
- req = afs_read_dir(dvnode, key);
- if (IS_ERR(req))
- return PTR_ERR(req);
- *_dir_version = req->data_version;
- /* round the file position up to the next entry boundary */
- ctx->pos += sizeof(union afs_xdr_dirent) - 1;
- ctx->pos &= ~(sizeof(union afs_xdr_dirent) - 1);
- /* walk through the blocks in sequence */
- ret = 0;
- while (ctx->pos < req->actual_len) {
- /* Fetch the appropriate folio from the directory and re-add it
- * to the LRU. We have all the pages pinned with an extra ref.
- */
- folio = __filemap_get_folio(dir->i_mapping, ctx->pos / PAGE_SIZE,
- FGP_ACCESSED, 0);
- if (!folio) {
- ret = afs_bad(dvnode, afs_file_error_dir_missing_page);
- break;
- }
- offset = round_down(ctx->pos, sizeof(*dblock)) - folio_file_pos(folio);
- size = min_t(loff_t, folio_size(folio),
- req->actual_len - folio_file_pos(folio));
- do {
- dblock = kmap_local_folio(folio, offset);
- ret = afs_dir_iterate_block(dvnode, ctx, dblock,
- folio_file_pos(folio) + offset);
- kunmap_local(dblock);
- if (ret != 1)
- goto out;
- } while (offset += sizeof(*dblock), offset < size);
- ret = 0;
- }
- out:
- up_read(&dvnode->validate_lock);
- afs_put_read(req);
- _leave(" = %d", ret);
- return ret;
- }
- /*
- * read an AFS directory
- */
- static int afs_readdir(struct file *file, struct dir_context *ctx)
- {
- afs_dataversion_t dir_version;
- return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file),
- &dir_version);
- }
- /*
- * Search the directory for a single name
- * - if afs_dir_iterate_block() spots this function, it'll pass the FID
- * uniquifier through dtype
- */
- static bool afs_lookup_one_filldir(struct dir_context *ctx, const char *name,
- int nlen, loff_t fpos, u64 ino, unsigned dtype)
- {
- struct afs_lookup_one_cookie *cookie =
- container_of(ctx, struct afs_lookup_one_cookie, ctx);
- _enter("{%s,%u},%s,%u,,%llu,%u",
- cookie->name.name, cookie->name.len, name, nlen,
- (unsigned long long) ino, dtype);
- /* insanity checks first */
- BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
- BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
- if (cookie->name.len != nlen ||
- memcmp(cookie->name.name, name, nlen) != 0) {
- _leave(" = true [keep looking]");
- return true;
- }
- cookie->fid.vnode = ino;
- cookie->fid.unique = dtype;
- cookie->found = 1;
- _leave(" = false [found]");
- return false;
- }
- /*
- * Do a lookup of a single name in a directory
- * - just returns the FID the dentry name maps to if found
- */
- static int afs_do_lookup_one(struct inode *dir, struct dentry *dentry,
- struct afs_fid *fid, struct key *key,
- afs_dataversion_t *_dir_version)
- {
- struct afs_super_info *as = dir->i_sb->s_fs_info;
- struct afs_lookup_one_cookie cookie = {
- .ctx.actor = afs_lookup_one_filldir,
- .name = dentry->d_name,
- .fid.vid = as->volume->vid
- };
- int ret;
- _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry);
- /* search the directory */
- ret = afs_dir_iterate(dir, &cookie.ctx, key, _dir_version);
- if (ret < 0) {
- _leave(" = %d [iter]", ret);
- return ret;
- }
- if (!cookie.found) {
- _leave(" = -ENOENT [not found]");
- return -ENOENT;
- }
- *fid = cookie.fid;
- _leave(" = 0 { vn=%llu u=%u }", fid->vnode, fid->unique);
- return 0;
- }
- /*
- * search the directory for a name
- * - if afs_dir_iterate_block() spots this function, it'll pass the FID
- * uniquifier through dtype
- */
- static bool afs_lookup_filldir(struct dir_context *ctx, const char *name,
- int nlen, loff_t fpos, u64 ino, unsigned dtype)
- {
- struct afs_lookup_cookie *cookie =
- container_of(ctx, struct afs_lookup_cookie, ctx);
- _enter("{%s,%u},%s,%u,,%llu,%u",
- cookie->name.name, cookie->name.len, name, nlen,
- (unsigned long long) ino, dtype);
- /* insanity checks first */
- BUILD_BUG_ON(sizeof(union afs_xdr_dir_block) != 2048);
- BUILD_BUG_ON(sizeof(union afs_xdr_dirent) != 32);
- if (cookie->found) {
- if (cookie->nr_fids < 50) {
- cookie->fids[cookie->nr_fids].vnode = ino;
- cookie->fids[cookie->nr_fids].unique = dtype;
- cookie->nr_fids++;
- }
- } else if (cookie->name.len == nlen &&
- memcmp(cookie->name.name, name, nlen) == 0) {
- cookie->fids[1].vnode = ino;
- cookie->fids[1].unique = dtype;
- cookie->found = 1;
- if (cookie->one_only)
- return false;
- }
- return cookie->nr_fids < 50;
- }
- /*
- * Deal with the result of a successful lookup operation. Turn all the files
- * into inodes and save the first one - which is the one we actually want.
- */
- static void afs_do_lookup_success(struct afs_operation *op)
- {
- struct afs_vnode_param *vp;
- struct afs_vnode *vnode;
- struct inode *inode;
- u32 abort_code;
- int i;
- _enter("");
- for (i = 0; i < op->nr_files; i++) {
- switch (i) {
- case 0:
- vp = &op->file[0];
- abort_code = vp->scb.status.abort_code;
- if (abort_code != 0) {
- op->ac.abort_code = abort_code;
- op->error = afs_abort_to_error(abort_code);
- }
- break;
- case 1:
- vp = &op->file[1];
- break;
- default:
- vp = &op->more_files[i - 2];
- break;
- }
- if (!vp->scb.have_status && !vp->scb.have_error)
- continue;
- _debug("do [%u]", i);
- if (vp->vnode) {
- if (!test_bit(AFS_VNODE_UNSET, &vp->vnode->flags))
- afs_vnode_commit_status(op, vp);
- } else if (vp->scb.status.abort_code == 0) {
- inode = afs_iget(op, vp);
- if (!IS_ERR(inode)) {
- vnode = AFS_FS_I(inode);
- afs_cache_permit(vnode, op->key,
- 0 /* Assume vnode->cb_break is 0 */ +
- op->cb_v_break,
- &vp->scb);
- vp->vnode = vnode;
- vp->put_vnode = true;
- }
- } else {
- _debug("- abort %d %llx:%llx.%x",
- vp->scb.status.abort_code,
- vp->fid.vid, vp->fid.vnode, vp->fid.unique);
- }
- }
- _leave("");
- }
- static const struct afs_operation_ops afs_inline_bulk_status_operation = {
- .issue_afs_rpc = afs_fs_inline_bulk_status,
- .issue_yfs_rpc = yfs_fs_inline_bulk_status,
- .success = afs_do_lookup_success,
- };
- static const struct afs_operation_ops afs_lookup_fetch_status_operation = {
- .issue_afs_rpc = afs_fs_fetch_status,
- .issue_yfs_rpc = yfs_fs_fetch_status,
- .success = afs_do_lookup_success,
- .aborted = afs_check_for_remote_deletion,
- };
- /*
- * See if we know that the server we expect to use doesn't support
- * FS.InlineBulkStatus.
- */
- static bool afs_server_supports_ibulk(struct afs_vnode *dvnode)
- {
- struct afs_server_list *slist;
- struct afs_volume *volume = dvnode->volume;
- struct afs_server *server;
- bool ret = true;
- int i;
- if (!test_bit(AFS_VOLUME_MAYBE_NO_IBULK, &volume->flags))
- return true;
- rcu_read_lock();
- slist = rcu_dereference(volume->servers);
- for (i = 0; i < slist->nr_servers; i++) {
- server = slist->servers[i].server;
- if (server == dvnode->cb_server) {
- if (test_bit(AFS_SERVER_FL_NO_IBULK, &server->flags))
- ret = false;
- break;
- }
- }
- rcu_read_unlock();
- return ret;
- }
- /*
- * Do a lookup in a directory. We make use of bulk lookup to query a slew of
- * files in one go and create inodes for them. The inode of the file we were
- * asked for is returned.
- */
- static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry,
- struct key *key)
- {
- struct afs_lookup_cookie *cookie;
- struct afs_vnode_param *vp;
- struct afs_operation *op;
- struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode;
- struct inode *inode = NULL, *ti;
- afs_dataversion_t data_version = READ_ONCE(dvnode->status.data_version);
- long ret;
- int i;
- _enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry);
- cookie = kzalloc(sizeof(struct afs_lookup_cookie), GFP_KERNEL);
- if (!cookie)
- return ERR_PTR(-ENOMEM);
- for (i = 0; i < ARRAY_SIZE(cookie->fids); i++)
- cookie->fids[i].vid = dvnode->fid.vid;
- cookie->ctx.actor = afs_lookup_filldir;
- cookie->name = dentry->d_name;
- cookie->nr_fids = 2; /* slot 0 is saved for the fid we actually want
- * and slot 1 for the directory */
- if (!afs_server_supports_ibulk(dvnode))
- cookie->one_only = true;
- /* search the directory */
- ret = afs_dir_iterate(dir, &cookie->ctx, key, &data_version);
- if (ret < 0)
- goto out;
- dentry->d_fsdata = (void *)(unsigned long)data_version;
- ret = -ENOENT;
- if (!cookie->found)
- goto out;
- /* Check to see if we already have an inode for the primary fid. */
- inode = ilookup5(dir->i_sb, cookie->fids[1].vnode,
- afs_ilookup5_test_by_fid, &cookie->fids[1]);
- if (inode)
- goto out; /* We do */
- /* Okay, we didn't find it. We need to query the server - and whilst
- * we're doing that, we're going to attempt to look up a bunch of other
- * vnodes also.
- */
- op = afs_alloc_operation(NULL, dvnode->volume);
- if (IS_ERR(op)) {
- ret = PTR_ERR(op);
- goto out;
- }
- afs_op_set_vnode(op, 0, dvnode);
- afs_op_set_fid(op, 1, &cookie->fids[1]);
- op->nr_files = cookie->nr_fids;
- _debug("nr_files %u", op->nr_files);
- /* Need space for examining all the selected files */
- op->error = -ENOMEM;
- if (op->nr_files > 2) {
- op->more_files = kvcalloc(op->nr_files - 2,
- sizeof(struct afs_vnode_param),
- GFP_KERNEL);
- if (!op->more_files)
- goto out_op;
- for (i = 2; i < op->nr_files; i++) {
- vp = &op->more_files[i - 2];
- vp->fid = cookie->fids[i];
- /* Find any inodes that already exist and get their
- * callback counters.
- */
- ti = ilookup5_nowait(dir->i_sb, vp->fid.vnode,
- afs_ilookup5_test_by_fid, &vp->fid);
- if (!IS_ERR_OR_NULL(ti)) {
- vnode = AFS_FS_I(ti);
- vp->dv_before = vnode->status.data_version;
- vp->cb_break_before = afs_calc_vnode_cb_break(vnode);
- vp->vnode = vnode;
- vp->put_vnode = true;
- vp->speculative = true; /* vnode not locked */
- }
- }
- }
- /* Try FS.InlineBulkStatus first. Abort codes for the individual
- * lookups contained therein are stored in the reply without aborting
- * the whole operation.
- */
- op->error = -ENOTSUPP;
- if (!cookie->one_only) {
- op->ops = &afs_inline_bulk_status_operation;
- afs_begin_vnode_operation(op);
- afs_wait_for_operation(op);
- }
- if (op->error == -ENOTSUPP) {
- /* We could try FS.BulkStatus next, but this aborts the entire
- * op if any of the lookups fails - so, for the moment, revert
- * to FS.FetchStatus for op->file[1].
- */
- op->fetch_status.which = 1;
- op->ops = &afs_lookup_fetch_status_operation;
- afs_begin_vnode_operation(op);
- afs_wait_for_operation(op);
- }
- inode = ERR_PTR(op->error);
- out_op:
- if (op->error == 0) {
- inode = &op->file[1].vnode->netfs.inode;
- op->file[1].vnode = NULL;
- }
- if (op->file[0].scb.have_status)
- dentry->d_fsdata = (void *)(unsigned long)op->file[0].scb.status.data_version;
- else
- dentry->d_fsdata = (void *)(unsigned long)op->file[0].dv_before;
- ret = afs_put_operation(op);
- out:
- kfree(cookie);
- _leave("");
- return inode ?: ERR_PTR(ret);
- }
- /*
- * Look up an entry in a directory with @sys substitution.
- */
- static struct dentry *afs_lookup_atsys(struct inode *dir, struct dentry *dentry,
- struct key *key)
- {
- struct afs_sysnames *subs;
- struct afs_net *net = afs_i2net(dir);
- struct dentry *ret;
- char *buf, *p, *name;
- int len, i;
- _enter("");
- ret = ERR_PTR(-ENOMEM);
- p = buf = kmalloc(AFSNAMEMAX, GFP_KERNEL);
- if (!buf)
- goto out_p;
- if (dentry->d_name.len > 4) {
- memcpy(p, dentry->d_name.name, dentry->d_name.len - 4);
- p += dentry->d_name.len - 4;
- }
- /* There is an ordered list of substitutes that we have to try. */
- read_lock(&net->sysnames_lock);
- subs = net->sysnames;
- refcount_inc(&subs->usage);
- read_unlock(&net->sysnames_lock);
- for (i = 0; i < subs->nr; i++) {
- name = subs->subs[i];
- len = dentry->d_name.len - 4 + strlen(name);
- if (len >= AFSNAMEMAX) {
- ret = ERR_PTR(-ENAMETOOLONG);
- goto out_s;
- }
- strcpy(p, name);
- ret = lookup_one_len(buf, dentry->d_parent, len);
- if (IS_ERR(ret) || d_is_positive(ret))
- goto out_s;
- dput(ret);
- }
- /* We don't want to d_add() the @sys dentry here as we don't want to
- * the cached dentry to hide changes to the sysnames list.
- */
- ret = NULL;
- out_s:
- afs_put_sysnames(subs);
- kfree(buf);
- out_p:
- key_put(key);
- return ret;
- }
- /*
- * look up an entry in a directory
- */
- static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
- unsigned int flags)
- {
- struct afs_vnode *dvnode = AFS_FS_I(dir);
- struct afs_fid fid = {};
- struct inode *inode;
- struct dentry *d;
- struct key *key;
- int ret;
- _enter("{%llx:%llu},%p{%pd},",
- dvnode->fid.vid, dvnode->fid.vnode, dentry, dentry);
- ASSERTCMP(d_inode(dentry), ==, NULL);
- if (dentry->d_name.len >= AFSNAMEMAX) {
- _leave(" = -ENAMETOOLONG");
- return ERR_PTR(-ENAMETOOLONG);
- }
- if (test_bit(AFS_VNODE_DELETED, &dvnode->flags)) {
- _leave(" = -ESTALE");
- return ERR_PTR(-ESTALE);
- }
- key = afs_request_key(dvnode->volume->cell);
- if (IS_ERR(key)) {
- _leave(" = %ld [key]", PTR_ERR(key));
- return ERR_CAST(key);
- }
- ret = afs_validate(dvnode, key);
- if (ret < 0) {
- key_put(key);
- _leave(" = %d [val]", ret);
- return ERR_PTR(ret);
- }
- if (dentry->d_name.len >= 4 &&
- dentry->d_name.name[dentry->d_name.len - 4] == '@' &&
- dentry->d_name.name[dentry->d_name.len - 3] == 's' &&
- dentry->d_name.name[dentry->d_name.len - 2] == 'y' &&
- dentry->d_name.name[dentry->d_name.len - 1] == 's')
- return afs_lookup_atsys(dir, dentry, key);
- afs_stat_v(dvnode, n_lookup);
- inode = afs_do_lookup(dir, dentry, key);
- key_put(key);
- if (inode == ERR_PTR(-ENOENT))
- inode = afs_try_auto_mntpt(dentry, dir);
- if (!IS_ERR_OR_NULL(inode))
- fid = AFS_FS_I(inode)->fid;
- _debug("splice %p", dentry->d_inode);
- d = d_splice_alias(inode, dentry);
- if (!IS_ERR_OR_NULL(d)) {
- d->d_fsdata = dentry->d_fsdata;
- trace_afs_lookup(dvnode, &d->d_name, &fid);
- } else {
- trace_afs_lookup(dvnode, &dentry->d_name, &fid);
- }
- _leave("");
- return d;
- }
- /*
- * Check the validity of a dentry under RCU conditions.
- */
- static int afs_d_revalidate_rcu(struct dentry *dentry)
- {
- struct afs_vnode *dvnode;
- struct dentry *parent;
- struct inode *dir;
- long dir_version, de_version;
- _enter("%p", dentry);
- /* Check the parent directory is still valid first. */
- parent = READ_ONCE(dentry->d_parent);
- dir = d_inode_rcu(parent);
- if (!dir)
- return -ECHILD;
- dvnode = AFS_FS_I(dir);
- if (test_bit(AFS_VNODE_DELETED, &dvnode->flags))
- return -ECHILD;
- if (!afs_check_validity(dvnode))
- return -ECHILD;
- /* We only need to invalidate a dentry if the server's copy changed
- * behind our back. If we made the change, it's no problem. Note that
- * on a 32-bit system, we only have 32 bits in the dentry to store the
- * version.
- */
- dir_version = (long)READ_ONCE(dvnode->status.data_version);
- de_version = (long)READ_ONCE(dentry->d_fsdata);
- if (de_version != dir_version) {
- dir_version = (long)READ_ONCE(dvnode->invalid_before);
- if (de_version - dir_version < 0)
- return -ECHILD;
- }
- return 1; /* Still valid */
- }
- /*
- * check that a dentry lookup hit has found a valid entry
- * - NOTE! the hit can be a negative hit too, so we can't assume we have an
- * inode
- */
- static int afs_d_revalidate(struct dentry *dentry, unsigned int flags)
- {
- struct afs_vnode *vnode, *dir;
- struct afs_fid fid;
- struct dentry *parent;
- struct inode *inode;
- struct key *key;
- afs_dataversion_t dir_version, invalid_before;
- long de_version;
- int ret;
- if (flags & LOOKUP_RCU)
- return afs_d_revalidate_rcu(dentry);
- if (d_really_is_positive(dentry)) {
- vnode = AFS_FS_I(d_inode(dentry));
- _enter("{v={%llx:%llu} n=%pd fl=%lx},",
- vnode->fid.vid, vnode->fid.vnode, dentry,
- vnode->flags);
- } else {
- _enter("{neg n=%pd}", dentry);
- }
- key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell);
- if (IS_ERR(key))
- key = NULL;
- /* Hold the parent dentry so we can peer at it */
- parent = dget_parent(dentry);
- dir = AFS_FS_I(d_inode(parent));
- /* validate the parent directory */
- afs_validate(dir, key);
- if (test_bit(AFS_VNODE_DELETED, &dir->flags)) {
- _debug("%pd: parent dir deleted", dentry);
- goto not_found;
- }
- /* We only need to invalidate a dentry if the server's copy changed
- * behind our back. If we made the change, it's no problem. Note that
- * on a 32-bit system, we only have 32 bits in the dentry to store the
- * version.
- */
- dir_version = dir->status.data_version;
- de_version = (long)dentry->d_fsdata;
- if (de_version == (long)dir_version)
- goto out_valid_noupdate;
- invalid_before = dir->invalid_before;
- if (de_version - (long)invalid_before >= 0)
- goto out_valid;
- _debug("dir modified");
- afs_stat_v(dir, n_reval);
- /* search the directory for this vnode */
- ret = afs_do_lookup_one(&dir->netfs.inode, dentry, &fid, key, &dir_version);
- switch (ret) {
- case 0:
- /* the filename maps to something */
- if (d_really_is_negative(dentry))
- goto not_found;
- inode = d_inode(dentry);
- if (is_bad_inode(inode)) {
- printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n",
- dentry);
- goto not_found;
- }
- vnode = AFS_FS_I(inode);
- /* if the vnode ID has changed, then the dirent points to a
- * different file */
- if (fid.vnode != vnode->fid.vnode) {
- _debug("%pd: dirent changed [%llu != %llu]",
- dentry, fid.vnode,
- vnode->fid.vnode);
- goto not_found;
- }
- /* if the vnode ID uniqifier has changed, then the file has
- * been deleted and replaced, and the original vnode ID has
- * been reused */
- if (fid.unique != vnode->fid.unique) {
- _debug("%pd: file deleted (uq %u -> %u I:%u)",
- dentry, fid.unique,
- vnode->fid.unique,
- vnode->netfs.inode.i_generation);
- goto not_found;
- }
- goto out_valid;
- case -ENOENT:
- /* the filename is unknown */
- _debug("%pd: dirent not found", dentry);
- if (d_really_is_positive(dentry))
- goto not_found;
- goto out_valid;
- default:
- _debug("failed to iterate dir %pd: %d",
- parent, ret);
- goto not_found;
- }
- out_valid:
- dentry->d_fsdata = (void *)(unsigned long)dir_version;
- out_valid_noupdate:
- dput(parent);
- key_put(key);
- _leave(" = 1 [valid]");
- return 1;
- not_found:
- _debug("dropping dentry %pd2", dentry);
- dput(parent);
- key_put(key);
- _leave(" = 0 [bad]");
- return 0;
- }
- /*
- * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't
- * sleep)
- * - called from dput() when d_count is going to 0.
- * - return 1 to request dentry be unhashed, 0 otherwise
- */
- static int afs_d_delete(const struct dentry *dentry)
- {
- _enter("%pd", dentry);
- if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
- goto zap;
- if (d_really_is_positive(dentry) &&
- (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(d_inode(dentry))->flags) ||
- test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags)))
- goto zap;
- _leave(" = 0 [keep]");
- return 0;
- zap:
- _leave(" = 1 [zap]");
- return 1;
- }
- /*
- * Clean up sillyrename files on dentry removal.
- */
- static void afs_d_iput(struct dentry *dentry, struct inode *inode)
- {
- if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
- afs_silly_iput(dentry, inode);
- iput(inode);
- }
- /*
- * handle dentry release
- */
- void afs_d_release(struct dentry *dentry)
- {
- _enter("%pd", dentry);
- }
- void afs_check_for_remote_deletion(struct afs_operation *op)
- {
- struct afs_vnode *vnode = op->file[0].vnode;
- switch (op->ac.abort_code) {
- case VNOVNODE:
- set_bit(AFS_VNODE_DELETED, &vnode->flags);
- afs_break_callback(vnode, afs_cb_break_for_deleted);
- }
- }
- /*
- * Create a new inode for create/mkdir/symlink
- */
- static void afs_vnode_new_inode(struct afs_operation *op)
- {
- struct afs_vnode_param *vp = &op->file[1];
- struct afs_vnode *vnode;
- struct inode *inode;
- _enter("");
- ASSERTCMP(op->error, ==, 0);
- inode = afs_iget(op, vp);
- if (IS_ERR(inode)) {
- /* ENOMEM or EINTR at a really inconvenient time - just abandon
- * the new directory on the server.
- */
- op->error = PTR_ERR(inode);
- return;
- }
- vnode = AFS_FS_I(inode);
- set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags);
- if (!op->error)
- afs_cache_permit(vnode, op->key, vnode->cb_break, &vp->scb);
- d_instantiate(op->dentry, inode);
- }
- static void afs_create_success(struct afs_operation *op)
- {
- _enter("op=%08x", op->debug_id);
- op->ctime = op->file[0].scb.status.mtime_client;
- afs_vnode_commit_status(op, &op->file[0]);
- afs_update_dentry_version(op, &op->file[0], op->dentry);
- afs_vnode_new_inode(op);
- }
- static void afs_create_edit_dir(struct afs_operation *op)
- {
- struct afs_vnode_param *dvp = &op->file[0];
- struct afs_vnode_param *vp = &op->file[1];
- struct afs_vnode *dvnode = dvp->vnode;
- _enter("op=%08x", op->debug_id);
- down_write(&dvnode->validate_lock);
- if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
- dvnode->status.data_version == dvp->dv_before + dvp->dv_delta)
- afs_edit_dir_add(dvnode, &op->dentry->d_name, &vp->fid,
- op->create.reason);
- up_write(&dvnode->validate_lock);
- }
- static void afs_create_put(struct afs_operation *op)
- {
- _enter("op=%08x", op->debug_id);
- if (op->error)
- d_drop(op->dentry);
- }
- static const struct afs_operation_ops afs_mkdir_operation = {
- .issue_afs_rpc = afs_fs_make_dir,
- .issue_yfs_rpc = yfs_fs_make_dir,
- .success = afs_create_success,
- .aborted = afs_check_for_remote_deletion,
- .edit_dir = afs_create_edit_dir,
- .put = afs_create_put,
- };
- /*
- * create a directory on an AFS filesystem
- */
- static int afs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
- struct dentry *dentry, umode_t mode)
- {
- struct afs_operation *op;
- struct afs_vnode *dvnode = AFS_FS_I(dir);
- _enter("{%llx:%llu},{%pd},%ho",
- dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
- op = afs_alloc_operation(NULL, dvnode->volume);
- if (IS_ERR(op)) {
- d_drop(dentry);
- return PTR_ERR(op);
- }
- afs_op_set_vnode(op, 0, dvnode);
- op->file[0].dv_delta = 1;
- op->file[0].modification = true;
- op->file[0].update_ctime = true;
- op->dentry = dentry;
- op->create.mode = S_IFDIR | mode;
- op->create.reason = afs_edit_dir_for_mkdir;
- op->mtime = current_time(dir);
- op->ops = &afs_mkdir_operation;
- return afs_do_sync_operation(op);
- }
- /*
- * Remove a subdir from a directory.
- */
- static void afs_dir_remove_subdir(struct dentry *dentry)
- {
- if (d_really_is_positive(dentry)) {
- struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
- clear_nlink(&vnode->netfs.inode);
- set_bit(AFS_VNODE_DELETED, &vnode->flags);
- clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
- clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
- }
- }
- static void afs_rmdir_success(struct afs_operation *op)
- {
- _enter("op=%08x", op->debug_id);
- op->ctime = op->file[0].scb.status.mtime_client;
- afs_vnode_commit_status(op, &op->file[0]);
- afs_update_dentry_version(op, &op->file[0], op->dentry);
- }
- static void afs_rmdir_edit_dir(struct afs_operation *op)
- {
- struct afs_vnode_param *dvp = &op->file[0];
- struct afs_vnode *dvnode = dvp->vnode;
- _enter("op=%08x", op->debug_id);
- afs_dir_remove_subdir(op->dentry);
- down_write(&dvnode->validate_lock);
- if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
- dvnode->status.data_version == dvp->dv_before + dvp->dv_delta)
- afs_edit_dir_remove(dvnode, &op->dentry->d_name,
- afs_edit_dir_for_rmdir);
- up_write(&dvnode->validate_lock);
- }
- static void afs_rmdir_put(struct afs_operation *op)
- {
- _enter("op=%08x", op->debug_id);
- if (op->file[1].vnode)
- up_write(&op->file[1].vnode->rmdir_lock);
- }
- static const struct afs_operation_ops afs_rmdir_operation = {
- .issue_afs_rpc = afs_fs_remove_dir,
- .issue_yfs_rpc = yfs_fs_remove_dir,
- .success = afs_rmdir_success,
- .aborted = afs_check_for_remote_deletion,
- .edit_dir = afs_rmdir_edit_dir,
- .put = afs_rmdir_put,
- };
- /*
- * remove a directory from an AFS filesystem
- */
- static int afs_rmdir(struct inode *dir, struct dentry *dentry)
- {
- struct afs_operation *op;
- struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL;
- int ret;
- _enter("{%llx:%llu},{%pd}",
- dvnode->fid.vid, dvnode->fid.vnode, dentry);
- op = afs_alloc_operation(NULL, dvnode->volume);
- if (IS_ERR(op))
- return PTR_ERR(op);
- afs_op_set_vnode(op, 0, dvnode);
- op->file[0].dv_delta = 1;
- op->file[0].modification = true;
- op->file[0].update_ctime = true;
- op->dentry = dentry;
- op->ops = &afs_rmdir_operation;
- /* Try to make sure we have a callback promise on the victim. */
- if (d_really_is_positive(dentry)) {
- vnode = AFS_FS_I(d_inode(dentry));
- ret = afs_validate(vnode, op->key);
- if (ret < 0)
- goto error;
- }
- if (vnode) {
- ret = down_write_killable(&vnode->rmdir_lock);
- if (ret < 0)
- goto error;
- op->file[1].vnode = vnode;
- }
- return afs_do_sync_operation(op);
- error:
- return afs_put_operation(op);
- }
- /*
- * Remove a link to a file or symlink from a directory.
- *
- * If the file was not deleted due to excess hard links, the fileserver will
- * break the callback promise on the file - if it had one - before it returns
- * to us, and if it was deleted, it won't
- *
- * However, if we didn't have a callback promise outstanding, or it was
- * outstanding on a different server, then it won't break it either...
- */
- static void afs_dir_remove_link(struct afs_operation *op)
- {
- struct afs_vnode *dvnode = op->file[0].vnode;
- struct afs_vnode *vnode = op->file[1].vnode;
- struct dentry *dentry = op->dentry;
- int ret;
- if (op->error != 0 ||
- (op->file[1].scb.have_status && op->file[1].scb.have_error))
- return;
- if (d_really_is_positive(dentry))
- return;
- if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
- /* Already done */
- } else if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) {
- write_seqlock(&vnode->cb_lock);
- drop_nlink(&vnode->netfs.inode);
- if (vnode->netfs.inode.i_nlink == 0) {
- set_bit(AFS_VNODE_DELETED, &vnode->flags);
- __afs_break_callback(vnode, afs_cb_break_for_unlink);
- }
- write_sequnlock(&vnode->cb_lock);
- } else {
- afs_break_callback(vnode, afs_cb_break_for_unlink);
- if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
- _debug("AFS_VNODE_DELETED");
- ret = afs_validate(vnode, op->key);
- if (ret != -ESTALE)
- op->error = ret;
- }
- _debug("nlink %d [val %d]", vnode->netfs.inode.i_nlink, op->error);
- }
- static void afs_unlink_success(struct afs_operation *op)
- {
- _enter("op=%08x", op->debug_id);
- op->ctime = op->file[0].scb.status.mtime_client;
- afs_check_dir_conflict(op, &op->file[0]);
- afs_vnode_commit_status(op, &op->file[0]);
- afs_vnode_commit_status(op, &op->file[1]);
- afs_update_dentry_version(op, &op->file[0], op->dentry);
- afs_dir_remove_link(op);
- }
- static void afs_unlink_edit_dir(struct afs_operation *op)
- {
- struct afs_vnode_param *dvp = &op->file[0];
- struct afs_vnode *dvnode = dvp->vnode;
- _enter("op=%08x", op->debug_id);
- down_write(&dvnode->validate_lock);
- if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags) &&
- dvnode->status.data_version == dvp->dv_before + dvp->dv_delta)
- afs_edit_dir_remove(dvnode, &op->dentry->d_name,
- afs_edit_dir_for_unlink);
- up_write(&dvnode->validate_lock);
- }
- static void afs_unlink_put(struct afs_operation *op)
- {
- _enter("op=%08x", op->debug_id);
- if (op->unlink.need_rehash && op->error < 0 && op->error != -ENOENT)
- d_rehash(op->dentry);
- }
- static const struct afs_operation_ops afs_unlink_operation = {
- .issue_afs_rpc = afs_fs_remove_file,
- .issue_yfs_rpc = yfs_fs_remove_file,
- .success = afs_unlink_success,
- .aborted = afs_check_for_remote_deletion,
- .edit_dir = afs_unlink_edit_dir,
- .put = afs_unlink_put,
- };
- /*
- * Remove a file or symlink from an AFS filesystem.
- */
- static int afs_unlink(struct inode *dir, struct dentry *dentry)
- {
- struct afs_operation *op;
- struct afs_vnode *dvnode = AFS_FS_I(dir);
- struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
- int ret;
- _enter("{%llx:%llu},{%pd}",
- dvnode->fid.vid, dvnode->fid.vnode, dentry);
- if (dentry->d_name.len >= AFSNAMEMAX)
- return -ENAMETOOLONG;
- op = afs_alloc_operation(NULL, dvnode->volume);
- if (IS_ERR(op))
- return PTR_ERR(op);
- afs_op_set_vnode(op, 0, dvnode);
- op->file[0].dv_delta = 1;
- op->file[0].modification = true;
- op->file[0].update_ctime = true;
- /* Try to make sure we have a callback promise on the victim. */
- ret = afs_validate(vnode, op->key);
- if (ret < 0) {
- op->error = ret;
- goto error;
- }
- spin_lock(&dentry->d_lock);
- if (d_count(dentry) > 1) {
- spin_unlock(&dentry->d_lock);
- /* Start asynchronous writeout of the inode */
- write_inode_now(d_inode(dentry), 0);
- op->error = afs_sillyrename(dvnode, vnode, dentry, op->key);
- goto error;
- }
- if (!d_unhashed(dentry)) {
- /* Prevent a race with RCU lookup. */
- __d_drop(dentry);
- op->unlink.need_rehash = true;
- }
- spin_unlock(&dentry->d_lock);
- op->file[1].vnode = vnode;
- op->file[1].update_ctime = true;
- op->file[1].op_unlinked = true;
- op->dentry = dentry;
- op->ops = &afs_unlink_operation;
- afs_begin_vnode_operation(op);
- afs_wait_for_operation(op);
- /* If there was a conflict with a third party, check the status of the
- * unlinked vnode.
- */
- if (op->error == 0 && (op->flags & AFS_OPERATION_DIR_CONFLICT)) {
- op->file[1].update_ctime = false;
- op->fetch_status.which = 1;
- op->ops = &afs_fetch_status_operation;
- afs_begin_vnode_operation(op);
- afs_wait_for_operation(op);
- }
- return afs_put_operation(op);
- error:
- return afs_put_operation(op);
- }
- static const struct afs_operation_ops afs_create_operation = {
- .issue_afs_rpc = afs_fs_create_file,
- .issue_yfs_rpc = yfs_fs_create_file,
- .success = afs_create_success,
- .aborted = afs_check_for_remote_deletion,
- .edit_dir = afs_create_edit_dir,
- .put = afs_create_put,
- };
- /*
- * create a regular file on an AFS filesystem
- */
- static int afs_create(struct user_namespace *mnt_userns, struct inode *dir,
- struct dentry *dentry, umode_t mode, bool excl)
- {
- struct afs_operation *op;
- struct afs_vnode *dvnode = AFS_FS_I(dir);
- int ret = -ENAMETOOLONG;
- _enter("{%llx:%llu},{%pd},%ho",
- dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
- if (dentry->d_name.len >= AFSNAMEMAX)
- goto error;
- op = afs_alloc_operation(NULL, dvnode->volume);
- if (IS_ERR(op)) {
- ret = PTR_ERR(op);
- goto error;
- }
- afs_op_set_vnode(op, 0, dvnode);
- op->file[0].dv_delta = 1;
- op->file[0].modification = true;
- op->file[0].update_ctime = true;
- op->dentry = dentry;
- op->create.mode = S_IFREG | mode;
- op->create.reason = afs_edit_dir_for_create;
- op->mtime = current_time(dir);
- op->ops = &afs_create_operation;
- return afs_do_sync_operation(op);
- error:
- d_drop(dentry);
- _leave(" = %d", ret);
- return ret;
- }
- static void afs_link_success(struct afs_operation *op)
- {
- struct afs_vnode_param *dvp = &op->file[0];
- struct afs_vnode_param *vp = &op->file[1];
- _enter("op=%08x", op->debug_id);
- op->ctime = dvp->scb.status.mtime_client;
- afs_vnode_commit_status(op, dvp);
- afs_vnode_commit_status(op, vp);
- afs_update_dentry_version(op, dvp, op->dentry);
- if (op->dentry_2->d_parent == op->dentry->d_parent)
- afs_update_dentry_version(op, dvp, op->dentry_2);
- ihold(&vp->vnode->netfs.inode);
- d_instantiate(op->dentry, &vp->vnode->netfs.inode);
- }
- static void afs_link_put(struct afs_operation *op)
- {
- _enter("op=%08x", op->debug_id);
- if (op->error)
- d_drop(op->dentry);
- }
- static const struct afs_operation_ops afs_link_operation = {
- .issue_afs_rpc = afs_fs_link,
- .issue_yfs_rpc = yfs_fs_link,
- .success = afs_link_success,
- .aborted = afs_check_for_remote_deletion,
- .edit_dir = afs_create_edit_dir,
- .put = afs_link_put,
- };
- /*
- * create a hard link between files in an AFS filesystem
- */
- static int afs_link(struct dentry *from, struct inode *dir,
- struct dentry *dentry)
- {
- struct afs_operation *op;
- struct afs_vnode *dvnode = AFS_FS_I(dir);
- struct afs_vnode *vnode = AFS_FS_I(d_inode(from));
- int ret = -ENAMETOOLONG;
- _enter("{%llx:%llu},{%llx:%llu},{%pd}",
- vnode->fid.vid, vnode->fid.vnode,
- dvnode->fid.vid, dvnode->fid.vnode,
- dentry);
- if (dentry->d_name.len >= AFSNAMEMAX)
- goto error;
- op = afs_alloc_operation(NULL, dvnode->volume);
- if (IS_ERR(op)) {
- ret = PTR_ERR(op);
- goto error;
- }
- ret = afs_validate(vnode, op->key);
- if (ret < 0)
- goto error_op;
- afs_op_set_vnode(op, 0, dvnode);
- afs_op_set_vnode(op, 1, vnode);
- op->file[0].dv_delta = 1;
- op->file[0].modification = true;
- op->file[0].update_ctime = true;
- op->file[1].update_ctime = true;
- op->dentry = dentry;
- op->dentry_2 = from;
- op->ops = &afs_link_operation;
- op->create.reason = afs_edit_dir_for_link;
- return afs_do_sync_operation(op);
- error_op:
- afs_put_operation(op);
- error:
- d_drop(dentry);
- _leave(" = %d", ret);
- return ret;
- }
- static const struct afs_operation_ops afs_symlink_operation = {
- .issue_afs_rpc = afs_fs_symlink,
- .issue_yfs_rpc = yfs_fs_symlink,
- .success = afs_create_success,
- .aborted = afs_check_for_remote_deletion,
- .edit_dir = afs_create_edit_dir,
- .put = afs_create_put,
- };
- /*
- * create a symlink in an AFS filesystem
- */
- static int afs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
- struct dentry *dentry, const char *content)
- {
- struct afs_operation *op;
- struct afs_vnode *dvnode = AFS_FS_I(dir);
- int ret;
- _enter("{%llx:%llu},{%pd},%s",
- dvnode->fid.vid, dvnode->fid.vnode, dentry,
- content);
- ret = -ENAMETOOLONG;
- if (dentry->d_name.len >= AFSNAMEMAX)
- goto error;
- ret = -EINVAL;
- if (strlen(content) >= AFSPATHMAX)
- goto error;
- op = afs_alloc_operation(NULL, dvnode->volume);
- if (IS_ERR(op)) {
- ret = PTR_ERR(op);
- goto error;
- }
- afs_op_set_vnode(op, 0, dvnode);
- op->file[0].dv_delta = 1;
- op->dentry = dentry;
- op->ops = &afs_symlink_operation;
- op->create.reason = afs_edit_dir_for_symlink;
- op->create.symlink = content;
- op->mtime = current_time(dir);
- return afs_do_sync_operation(op);
- error:
- d_drop(dentry);
- _leave(" = %d", ret);
- return ret;
- }
- static void afs_rename_success(struct afs_operation *op)
- {
- _enter("op=%08x", op->debug_id);
- op->ctime = op->file[0].scb.status.mtime_client;
- afs_check_dir_conflict(op, &op->file[1]);
- afs_vnode_commit_status(op, &op->file[0]);
- if (op->file[1].vnode != op->file[0].vnode) {
- op->ctime = op->file[1].scb.status.mtime_client;
- afs_vnode_commit_status(op, &op->file[1]);
- }
- }
- static void afs_rename_edit_dir(struct afs_operation *op)
- {
- struct afs_vnode_param *orig_dvp = &op->file[0];
- struct afs_vnode_param *new_dvp = &op->file[1];
- struct afs_vnode *orig_dvnode = orig_dvp->vnode;
- struct afs_vnode *new_dvnode = new_dvp->vnode;
- struct afs_vnode *vnode = AFS_FS_I(d_inode(op->dentry));
- struct dentry *old_dentry = op->dentry;
- struct dentry *new_dentry = op->dentry_2;
- struct inode *new_inode;
- _enter("op=%08x", op->debug_id);
- if (op->rename.rehash) {
- d_rehash(op->rename.rehash);
- op->rename.rehash = NULL;
- }
- down_write(&orig_dvnode->validate_lock);
- if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags) &&
- orig_dvnode->status.data_version == orig_dvp->dv_before + orig_dvp->dv_delta)
- afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name,
- afs_edit_dir_for_rename_0);
- if (new_dvnode != orig_dvnode) {
- up_write(&orig_dvnode->validate_lock);
- down_write(&new_dvnode->validate_lock);
- }
- if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags) &&
- new_dvnode->status.data_version == new_dvp->dv_before + new_dvp->dv_delta) {
- if (!op->rename.new_negative)
- afs_edit_dir_remove(new_dvnode, &new_dentry->d_name,
- afs_edit_dir_for_rename_1);
- afs_edit_dir_add(new_dvnode, &new_dentry->d_name,
- &vnode->fid, afs_edit_dir_for_rename_2);
- }
- new_inode = d_inode(new_dentry);
- if (new_inode) {
- spin_lock(&new_inode->i_lock);
- if (S_ISDIR(new_inode->i_mode))
- clear_nlink(new_inode);
- else if (new_inode->i_nlink > 0)
- drop_nlink(new_inode);
- spin_unlock(&new_inode->i_lock);
- }
- /* Now we can update d_fsdata on the dentries to reflect their
- * new parent's data_version.
- *
- * Note that if we ever implement RENAME_EXCHANGE, we'll have
- * to update both dentries with opposing dir versions.
- */
- afs_update_dentry_version(op, new_dvp, op->dentry);
- afs_update_dentry_version(op, new_dvp, op->dentry_2);
- d_move(old_dentry, new_dentry);
- up_write(&new_dvnode->validate_lock);
- }
- static void afs_rename_put(struct afs_operation *op)
- {
- _enter("op=%08x", op->debug_id);
- if (op->rename.rehash)
- d_rehash(op->rename.rehash);
- dput(op->rename.tmp);
- if (op->error)
- d_rehash(op->dentry);
- }
- static const struct afs_operation_ops afs_rename_operation = {
- .issue_afs_rpc = afs_fs_rename,
- .issue_yfs_rpc = yfs_fs_rename,
- .success = afs_rename_success,
- .edit_dir = afs_rename_edit_dir,
- .put = afs_rename_put,
- };
- /*
- * rename a file in an AFS filesystem and/or move it between directories
- */
- static int afs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
- struct dentry *old_dentry, struct inode *new_dir,
- struct dentry *new_dentry, unsigned int flags)
- {
- struct afs_operation *op;
- struct afs_vnode *orig_dvnode, *new_dvnode, *vnode;
- int ret;
- if (flags)
- return -EINVAL;
- /* Don't allow silly-rename files be moved around. */
- if (old_dentry->d_flags & DCACHE_NFSFS_RENAMED)
- return -EINVAL;
- vnode = AFS_FS_I(d_inode(old_dentry));
- orig_dvnode = AFS_FS_I(old_dir);
- new_dvnode = AFS_FS_I(new_dir);
- _enter("{%llx:%llu},{%llx:%llu},{%llx:%llu},{%pd}",
- orig_dvnode->fid.vid, orig_dvnode->fid.vnode,
- vnode->fid.vid, vnode->fid.vnode,
- new_dvnode->fid.vid, new_dvnode->fid.vnode,
- new_dentry);
- op = afs_alloc_operation(NULL, orig_dvnode->volume);
- if (IS_ERR(op))
- return PTR_ERR(op);
- ret = afs_validate(vnode, op->key);
- op->error = ret;
- if (ret < 0)
- goto error;
- afs_op_set_vnode(op, 0, orig_dvnode);
- afs_op_set_vnode(op, 1, new_dvnode); /* May be same as orig_dvnode */
- op->file[0].dv_delta = 1;
- op->file[1].dv_delta = 1;
- op->file[0].modification = true;
- op->file[1].modification = true;
- op->file[0].update_ctime = true;
- op->file[1].update_ctime = true;
- op->dentry = old_dentry;
- op->dentry_2 = new_dentry;
- op->rename.new_negative = d_is_negative(new_dentry);
- op->ops = &afs_rename_operation;
- /* For non-directories, check whether the target is busy and if so,
- * make a copy of the dentry and then do a silly-rename. If the
- * silly-rename succeeds, the copied dentry is hashed and becomes the
- * new target.
- */
- if (d_is_positive(new_dentry) && !d_is_dir(new_dentry)) {
- /* To prevent any new references to the target during the
- * rename, we unhash the dentry in advance.
- */
- if (!d_unhashed(new_dentry)) {
- d_drop(new_dentry);
- op->rename.rehash = new_dentry;
- }
- if (d_count(new_dentry) > 2) {
- /* copy the target dentry's name */
- op->rename.tmp = d_alloc(new_dentry->d_parent,
- &new_dentry->d_name);
- if (!op->rename.tmp) {
- op->error = -ENOMEM;
- goto error;
- }
- ret = afs_sillyrename(new_dvnode,
- AFS_FS_I(d_inode(new_dentry)),
- new_dentry, op->key);
- if (ret) {
- op->error = ret;
- goto error;
- }
- op->dentry_2 = op->rename.tmp;
- op->rename.rehash = NULL;
- op->rename.new_negative = true;
- }
- }
- /* This bit is potentially nasty as there's a potential race with
- * afs_d_revalidate{,_rcu}(). We have to change d_fsdata on the dentry
- * to reflect it's new parent's new data_version after the op, but
- * d_revalidate may see old_dentry between the op having taken place
- * and the version being updated.
- *
- * So drop the old_dentry for now to make other threads go through
- * lookup instead - which we hold a lock against.
- */
- d_drop(old_dentry);
- return afs_do_sync_operation(op);
- error:
- return afs_put_operation(op);
- }
- /*
- * Release a directory folio and clean up its private state if it's not busy
- * - return true if the folio can now be released, false if not
- */
- static bool afs_dir_release_folio(struct folio *folio, gfp_t gfp_flags)
- {
- struct afs_vnode *dvnode = AFS_FS_I(folio_inode(folio));
- _enter("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, folio_index(folio));
- folio_detach_private(folio);
- /* The directory will need reloading. */
- if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
- afs_stat_v(dvnode, n_relpg);
- return true;
- }
- /*
- * Invalidate part or all of a folio.
- */
- static void afs_dir_invalidate_folio(struct folio *folio, size_t offset,
- size_t length)
- {
- struct afs_vnode *dvnode = AFS_FS_I(folio_inode(folio));
- _enter("{%lu},%zu,%zu", folio->index, offset, length);
- BUG_ON(!folio_test_locked(folio));
- /* The directory will need reloading. */
- if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
- afs_stat_v(dvnode, n_inval);
- /* we clean up only if the entire folio is being invalidated */
- if (offset == 0 && length == folio_size(folio))
- folio_detach_private(folio);
- }
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