[Feature] add GA346 baseline version
Change-Id: Ic62933698569507dcf98240cdf5d9931ae34348f
diff --git a/src/kernel/linux/v4.19/fs/afs/dir.c b/src/kernel/linux/v4.19/fs/afs/dir.c
new file mode 100644
index 0000000..54e7f6f
--- /dev/null
+++ b/src/kernel/linux/v4.19/fs/afs/dir.c
@@ -0,0 +1,1645 @@
+/* dir.c: AFS filesystem directory handling
+ *
+ * Copyright (C) 2002, 2018 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#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 "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 int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, int nlen,
+ loff_t fpos, u64 ino, unsigned dtype);
+static int afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen,
+ loff_t fpos, u64 ino, unsigned dtype);
+static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
+ bool excl);
+static int afs_mkdir(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 inode *dir, struct dentry *dentry,
+ const char *content);
+static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
+ struct inode *new_dir, struct dentry *new_dentry,
+ unsigned int flags);
+static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags);
+static void afs_dir_invalidatepage(struct page *page, unsigned int offset,
+ unsigned int length);
+
+static int afs_dir_set_page_dirty(struct page *page)
+{
+ 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,
+ .listxattr = afs_listxattr,
+};
+
+const struct address_space_operations afs_dir_aops = {
+ .set_page_dirty = afs_dir_set_page_dirty,
+ .releasepage = afs_dir_releasepage,
+ .invalidatepage = afs_dir_invalidatepage,
+};
+
+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,
+};
+
+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_file_status *statuses;
+ struct afs_callback *callbacks;
+ struct afs_fid fids[50];
+};
+
+/*
+ * check that a directory page is valid
+ */
+static bool afs_dir_check_page(struct afs_vnode *dvnode, struct page *page,
+ loff_t i_size)
+{
+ struct afs_xdr_dir_page *dbuf;
+ loff_t latter, off;
+ int tmp, qty;
+
+ /* Determine how many magic numbers there should be in this page, but
+ * we must take care because the directory may change size under us.
+ */
+ off = page_offset(page);
+ if (i_size <= off)
+ goto checked;
+
+ latter = i_size - off;
+ if (latter >= PAGE_SIZE)
+ qty = PAGE_SIZE;
+ else
+ qty = latter;
+ qty /= sizeof(union afs_xdr_dir_block);
+
+ /* check them */
+ dbuf = kmap(page);
+ for (tmp = 0; tmp < qty; tmp++) {
+ if (dbuf->blocks[tmp].hdr.magic != AFS_DIR_MAGIC) {
+ printk("kAFS: %s(%lx): bad magic %d/%d is %04hx\n",
+ __func__, dvnode->vfs_inode.i_ino, tmp, qty,
+ ntohs(dbuf->blocks[tmp].hdr.magic));
+ trace_afs_dir_check_failed(dvnode, off, i_size);
+ kunmap(page);
+ goto error;
+ }
+
+ /* Make sure each block is NUL terminated so we can reasonably
+ * use string functions on it. The filenames in the page
+ * *should* be NUL-terminated anyway.
+ */
+ ((u8 *)&dbuf->blocks[tmp])[AFS_DIR_BLOCK_SIZE - 1] = 0;
+ }
+
+ kunmap(page);
+
+checked:
+ afs_stat_v(dvnode, n_read_dir);
+ return true;
+
+error:
+ return false;
+}
+
+/*
+ * 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 pages 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 afs_read *req;
+ loff_t i_size;
+ int nr_pages, nr_inline, i, n;
+ int ret = -ENOMEM;
+
+retry:
+ i_size = i_size_read(&dvnode->vfs_inode);
+ if (i_size < 2048)
+ return ERR_PTR(-EIO);
+ if (i_size > 2048 * 1024)
+ return ERR_PTR(-EFBIG);
+
+ _enter("%llu", i_size);
+
+ /* Get a request record to hold the page list. We want to hold it
+ * inline if we can, but we don't want to make an order 1 allocation.
+ */
+ nr_pages = (i_size + PAGE_SIZE - 1) / PAGE_SIZE;
+ nr_inline = nr_pages;
+ if (nr_inline > (PAGE_SIZE - sizeof(*req)) / sizeof(struct page *))
+ nr_inline = 0;
+
+ req = kzalloc(sizeof(*req) + sizeof(struct page *) * nr_inline,
+ GFP_KERNEL);
+ if (!req)
+ return ERR_PTR(-ENOMEM);
+
+ refcount_set(&req->usage, 1);
+ req->nr_pages = nr_pages;
+ 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 */
+ if (nr_inline > 0) {
+ req->pages = req->array;
+ } else {
+ req->pages = kcalloc(nr_pages, sizeof(struct page *),
+ GFP_KERNEL);
+ if (!req->pages)
+ goto error;
+ }
+
+ /* Get a list of all the pages that hold or will hold the directory
+ * content. We need to fill in any gaps that we might find where the
+ * memory reclaimer has been at work. If there are any gaps, we will
+ * need to reread the entire directory contents.
+ */
+ i = 0;
+ do {
+ n = find_get_pages_contig(dvnode->vfs_inode.i_mapping, i,
+ req->nr_pages - i,
+ req->pages + i);
+ _debug("find %u at %u/%u", n, i, req->nr_pages);
+ if (n == 0) {
+ gfp_t gfp = dvnode->vfs_inode.i_mapping->gfp_mask;
+
+ if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
+ afs_stat_v(dvnode, n_inval);
+
+ ret = -ENOMEM;
+ req->pages[i] = __page_cache_alloc(gfp);
+ if (!req->pages[i])
+ goto error;
+ ret = add_to_page_cache_lru(req->pages[i],
+ dvnode->vfs_inode.i_mapping,
+ i, gfp);
+ if (ret < 0)
+ goto error;
+
+ set_page_private(req->pages[i], 1);
+ SetPagePrivate(req->pages[i]);
+ unlock_page(req->pages[i]);
+ i++;
+ } else {
+ i += n;
+ }
+ } while (i < req->nr_pages);
+
+ /* 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)) {
+ ret = afs_fetch_data(dvnode, key, req);
+ if (ret < 0)
+ goto error_unlock;
+
+ task_io_account_read(PAGE_SIZE * req->nr_pages);
+
+ if (req->len < req->file_size)
+ goto content_has_grown;
+
+ /* Validate the data we just read. */
+ ret = -EIO;
+ for (i = 0; i < req->nr_pages; i++)
+ if (!afs_dir_check_page(dvnode, req->pages[i],
+ req->actual_len))
+ 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);
+
+content_has_grown:
+ up_write(&dvnode->validate_lock);
+ afs_put_read(req);
+ goto retry;
+}
+
+/*
+ * deal with one block in an AFS directory
+ */
+static int afs_dir_iterate_block(struct dir_context *ctx,
+ union afs_xdr_dir_block *block,
+ unsigned blkoff)
+{
+ union afs_xdr_dirent *dire;
+ unsigned offset, next, curr;
+ size_t nlen;
+ int tmp;
+
+ _enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block);
+
+ 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
+ ) {
+ next = offset + 1;
+
+ /* 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);
+ 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));
+
+ _debug("ENT[%zu.%u]: %s %zu \"%s\"",
+ blkoff / sizeof(union afs_xdr_dir_block), offset,
+ (offset < curr ? "skip" : "fill"),
+ nlen, dire->u.name);
+
+ /* work out where the next possible entry is */
+ for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_xdr_dirent)) {
+ if (next >= AFS_DIR_SLOTS_PER_BLOCK) {
+ _debug("ENT[%zu.%u]:"
+ " %u travelled beyond end dir block"
+ " (len %u/%zu)",
+ blkoff / sizeof(union afs_xdr_dir_block),
+ offset, next, tmp, nlen);
+ return -EIO;
+ }
+ if (!(block->hdr.bitmap[next / 8] &
+ (1 << (next % 8)))) {
+ _debug("ENT[%zu.%u]:"
+ " %u unmarked extension (len %u/%zu)",
+ blkoff / sizeof(union afs_xdr_dir_block),
+ offset, next, tmp, nlen);
+ return -EIO;
+ }
+
+ _debug("ENT[%zu.%u]: ext %u/%zu",
+ blkoff / sizeof(union afs_xdr_dir_block),
+ next, tmp, nlen);
+ next++;
+ }
+
+ /* skip if starts before the current position */
+ if (offset < curr)
+ 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)
+{
+ struct afs_vnode *dvnode = AFS_FS_I(dir);
+ struct afs_xdr_dir_page *dbuf;
+ union afs_xdr_dir_block *dblock;
+ struct afs_read *req;
+ struct page *page;
+ unsigned blkoff, limit;
+ 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);
+
+ /* 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) {
+ blkoff = ctx->pos & ~(sizeof(union afs_xdr_dir_block) - 1);
+
+ /* Fetch the appropriate page from the directory and re-add it
+ * to the LRU.
+ */
+ page = req->pages[blkoff / PAGE_SIZE];
+ if (!page) {
+ ret = -EIO;
+ break;
+ }
+ mark_page_accessed(page);
+
+ limit = blkoff & ~(PAGE_SIZE - 1);
+
+ dbuf = kmap(page);
+
+ /* deal with the individual blocks stashed on this page */
+ do {
+ dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) /
+ sizeof(union afs_xdr_dir_block)];
+ ret = afs_dir_iterate_block(ctx, dblock, blkoff);
+ if (ret != 1) {
+ kunmap(page);
+ goto out;
+ }
+
+ blkoff += sizeof(union afs_xdr_dir_block);
+
+ } while (ctx->pos < dir->i_size && blkoff < limit);
+
+ kunmap(page);
+ 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)
+{
+ return afs_dir_iterate(file_inode(file), ctx, afs_file_key(file));
+}
+
+/*
+ * Search the directory for a single name
+ * - if afs_dir_iterate_block() spots this function, it'll pass the FID
+ * uniquifier through dtype
+ */
+static int 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(" = 0 [no]");
+ return 0;
+ }
+
+ cookie->fid.vnode = ino;
+ cookie->fid.unique = dtype;
+ cookie->found = 1;
+
+ _leave(" = -1 [found]");
+ return -1;
+}
+
+/*
+ * 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)
+{
+ 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);
+ if (ret < 0) {
+ _leave(" = %d [iter]", ret);
+ return ret;
+ }
+
+ ret = -ENOENT;
+ if (!cookie.found) {
+ _leave(" = -ENOENT [not found]");
+ return -ENOENT;
+ }
+
+ *fid = cookie.fid;
+ _leave(" = 0 { vn=%u 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 int 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);
+ int ret;
+
+ _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[0].vnode = ino;
+ cookie->fids[0].unique = dtype;
+ cookie->found = 1;
+ if (cookie->one_only)
+ return -1;
+ }
+
+ ret = cookie->nr_fids >= 50 ? -1 : 0;
+ _leave(" = %d", ret);
+ 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_cb_interest *cbi = NULL;
+ struct afs_super_info *as = dir->i_sb->s_fs_info;
+ struct afs_iget_data data;
+ struct afs_fs_cursor fc;
+ struct afs_vnode *dvnode = AFS_FS_I(dir);
+ struct inode *inode = NULL;
+ int ret, 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);
+
+ cookie->ctx.actor = afs_lookup_filldir;
+ cookie->name = dentry->d_name;
+ cookie->nr_fids = 1; /* slot 0 is saved for the fid we actually want */
+
+ read_seqlock_excl(&dvnode->cb_lock);
+ if (dvnode->cb_interest &&
+ dvnode->cb_interest->server &&
+ test_bit(AFS_SERVER_FL_NO_IBULK, &dvnode->cb_interest->server->flags))
+ cookie->one_only = true;
+ read_sequnlock_excl(&dvnode->cb_lock);
+
+ for (i = 0; i < 50; i++)
+ cookie->fids[i].vid = as->volume->vid;
+
+ /* search the directory */
+ ret = afs_dir_iterate(dir, &cookie->ctx, key);
+ if (ret < 0) {
+ inode = ERR_PTR(ret);
+ goto out;
+ }
+
+ inode = ERR_PTR(-ENOENT);
+ if (!cookie->found)
+ goto out;
+
+ /* Check to see if we already have an inode for the primary fid. */
+ data.volume = dvnode->volume;
+ data.fid = cookie->fids[0];
+ inode = ilookup5(dir->i_sb, cookie->fids[0].vnode, afs_iget5_test, &data);
+ if (inode)
+ goto out;
+
+ /* Need space for examining all the selected files */
+ inode = ERR_PTR(-ENOMEM);
+ cookie->statuses = kcalloc(cookie->nr_fids, sizeof(struct afs_file_status),
+ GFP_KERNEL);
+ if (!cookie->statuses)
+ goto out;
+
+ cookie->callbacks = kcalloc(cookie->nr_fids, sizeof(struct afs_callback),
+ GFP_KERNEL);
+ if (!cookie->callbacks)
+ goto out_s;
+
+ /* Try FS.InlineBulkStatus first. Abort codes for the individual
+ * lookups contained therein are stored in the reply without aborting
+ * the whole operation.
+ */
+ if (cookie->one_only)
+ goto no_inline_bulk_status;
+
+ inode = ERR_PTR(-ERESTARTSYS);
+ if (afs_begin_vnode_operation(&fc, dvnode, key)) {
+ while (afs_select_fileserver(&fc)) {
+ if (test_bit(AFS_SERVER_FL_NO_IBULK,
+ &fc.cbi->server->flags)) {
+ fc.ac.abort_code = RX_INVALID_OPERATION;
+ fc.ac.error = -ECONNABORTED;
+ break;
+ }
+ afs_fs_inline_bulk_status(&fc,
+ afs_v2net(dvnode),
+ cookie->fids,
+ cookie->statuses,
+ cookie->callbacks,
+ cookie->nr_fids, NULL);
+ }
+
+ if (fc.ac.error == 0)
+ cbi = afs_get_cb_interest(fc.cbi);
+ if (fc.ac.abort_code == RX_INVALID_OPERATION)
+ set_bit(AFS_SERVER_FL_NO_IBULK, &fc.cbi->server->flags);
+ inode = ERR_PTR(afs_end_vnode_operation(&fc));
+ }
+
+ if (!IS_ERR(inode))
+ goto success;
+ if (fc.ac.abort_code != RX_INVALID_OPERATION)
+ goto out_c;
+
+no_inline_bulk_status:
+ /* 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 just the primary fid.
+ */
+ cookie->nr_fids = 1;
+ inode = ERR_PTR(-ERESTARTSYS);
+ if (afs_begin_vnode_operation(&fc, dvnode, key)) {
+ while (afs_select_fileserver(&fc)) {
+ afs_fs_fetch_status(&fc,
+ afs_v2net(dvnode),
+ cookie->fids,
+ cookie->statuses,
+ cookie->callbacks,
+ NULL);
+ }
+
+ if (fc.ac.error == 0)
+ cbi = afs_get_cb_interest(fc.cbi);
+ inode = ERR_PTR(afs_end_vnode_operation(&fc));
+ }
+
+ if (IS_ERR(inode))
+ goto out_c;
+
+ for (i = 0; i < cookie->nr_fids; i++)
+ cookie->statuses[i].abort_code = 0;
+
+success:
+ /* Turn all the files into inodes and save the first one - which is the
+ * one we actually want.
+ */
+ if (cookie->statuses[0].abort_code != 0)
+ inode = ERR_PTR(afs_abort_to_error(cookie->statuses[0].abort_code));
+
+ for (i = 0; i < cookie->nr_fids; i++) {
+ struct inode *ti;
+
+ if (cookie->statuses[i].abort_code != 0)
+ continue;
+
+ ti = afs_iget(dir->i_sb, key, &cookie->fids[i],
+ &cookie->statuses[i],
+ &cookie->callbacks[i],
+ cbi);
+ if (i == 0) {
+ inode = ti;
+ } else {
+ if (!IS_ERR(ti))
+ iput(ti);
+ }
+ }
+
+out_c:
+ afs_put_cb_interest(afs_v2net(dvnode), cbi);
+ kfree(cookie->callbacks);
+out_s:
+ kfree(cookie->statuses);
+out:
+ kfree(cookie);
+ return inode;
+}
+
+/*
+ * 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 inode *inode;
+ struct dentry *d;
+ struct key *key;
+ int ret;
+
+ _enter("{%x:%u},%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);
+ } else {
+ dentry->d_fsdata =
+ (void *)(unsigned long)dvnode->status.data_version;
+ }
+ d = d_splice_alias(inode, dentry);
+ if (!IS_ERR_OR_NULL(d))
+ d->d_fsdata = dentry->d_fsdata;
+ return d;
+}
+
+/*
+ * 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 uninitialized_var(fid);
+ struct dentry *parent;
+ struct inode *inode;
+ struct key *key;
+ long dir_version, de_version;
+ int ret;
+
+ if (flags & LOOKUP_RCU)
+ return -ECHILD;
+
+ if (d_really_is_positive(dentry)) {
+ vnode = AFS_FS_I(d_inode(dentry));
+ _enter("{v={%x:%u} 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;
+
+ if (d_really_is_positive(dentry)) {
+ inode = d_inode(dentry);
+ if (inode) {
+ vnode = AFS_FS_I(inode);
+ afs_validate(vnode, key);
+ if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
+ goto out_bad;
+ }
+ }
+
+ /* lock down 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 out_bad_parent;
+ }
+
+ /* 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)dir->status.data_version;
+ de_version = (long)dentry->d_fsdata;
+ if (de_version == dir_version)
+ goto out_valid_noupdate;
+
+ dir_version = (long)dir->invalid_before;
+ if (de_version - dir_version >= 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->vfs_inode, dentry, &fid, key);
+ switch (ret) {
+ case 0:
+ /* the filename maps to something */
+ if (d_really_is_negative(dentry))
+ goto out_bad_parent;
+ inode = d_inode(dentry);
+ if (is_bad_inode(inode)) {
+ printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n",
+ dentry);
+ goto out_bad_parent;
+ }
+
+ 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 [%u != %u]",
+ 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->vfs_inode.i_generation);
+ write_seqlock(&vnode->cb_lock);
+ set_bit(AFS_VNODE_DELETED, &vnode->flags);
+ write_sequnlock(&vnode->cb_lock);
+ 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 out_bad_parent;
+ }
+
+out_valid:
+ dentry->d_fsdata = (void *)dir_version;
+out_valid_noupdate:
+ dput(parent);
+ key_put(key);
+ _leave(" = 1 [valid]");
+ return 1;
+
+ /* the dirent, if it exists, now points to a different vnode */
+not_found:
+ spin_lock(&dentry->d_lock);
+ dentry->d_flags |= DCACHE_NFSFS_RENAMED;
+ spin_unlock(&dentry->d_lock);
+
+out_bad_parent:
+ _debug("dropping dentry %pd2", dentry);
+ dput(parent);
+out_bad:
+ 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;
+}
+
+/*
+ * handle dentry release
+ */
+void afs_d_release(struct dentry *dentry)
+{
+ _enter("%pd", dentry);
+}
+
+/*
+ * Create a new inode for create/mkdir/symlink
+ */
+static void afs_vnode_new_inode(struct afs_fs_cursor *fc,
+ struct dentry *new_dentry,
+ struct afs_fid *newfid,
+ struct afs_file_status *newstatus,
+ struct afs_callback *newcb)
+{
+ struct afs_vnode *vnode;
+ struct inode *inode;
+
+ if (fc->ac.error < 0)
+ return;
+
+ d_drop(new_dentry);
+
+ inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key,
+ newfid, newstatus, newcb, fc->cbi);
+ if (IS_ERR(inode)) {
+ /* ENOMEM or EINTR at a really inconvenient time - just abandon
+ * the new directory on the server.
+ */
+ fc->ac.error = PTR_ERR(inode);
+ return;
+ }
+
+ vnode = AFS_FS_I(inode);
+ set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags);
+ d_add(new_dentry, inode);
+}
+
+/*
+ * create a directory on an AFS filesystem
+ */
+static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+{
+ struct afs_file_status newstatus;
+ struct afs_fs_cursor fc;
+ struct afs_callback newcb;
+ struct afs_vnode *dvnode = AFS_FS_I(dir);
+ struct afs_fid newfid;
+ struct key *key;
+ u64 data_version = dvnode->status.data_version;
+ int ret;
+
+ mode |= S_IFDIR;
+
+ _enter("{%x:%u},{%pd},%ho",
+ dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
+
+ key = afs_request_key(dvnode->volume->cell);
+ if (IS_ERR(key)) {
+ ret = PTR_ERR(key);
+ goto error;
+ }
+
+ ret = -ERESTARTSYS;
+ if (afs_begin_vnode_operation(&fc, dvnode, key)) {
+ while (afs_select_fileserver(&fc)) {
+ fc.cb_break = afs_calc_vnode_cb_break(dvnode);
+ afs_fs_create(&fc, dentry->d_name.name, mode, data_version,
+ &newfid, &newstatus, &newcb);
+ }
+
+ afs_check_for_remote_deletion(&fc, fc.vnode);
+ afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
+ afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb);
+ ret = afs_end_vnode_operation(&fc);
+ if (ret < 0)
+ goto error_key;
+ } else {
+ goto error_key;
+ }
+
+ if (ret == 0 &&
+ test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
+ afs_edit_dir_add(dvnode, &dentry->d_name, &newfid,
+ afs_edit_dir_for_create);
+
+ key_put(key);
+ _leave(" = 0");
+ return 0;
+
+error_key:
+ key_put(key);
+error:
+ d_drop(dentry);
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * 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->vfs_inode);
+ set_bit(AFS_VNODE_DELETED, &vnode->flags);
+ clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
+ clear_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
+ }
+}
+
+/*
+ * remove a directory from an AFS filesystem
+ */
+static int afs_rmdir(struct inode *dir, struct dentry *dentry)
+{
+ struct afs_fs_cursor fc;
+ struct afs_vnode *dvnode = AFS_FS_I(dir);
+ struct key *key;
+ u64 data_version = dvnode->status.data_version;
+ int ret;
+
+ _enter("{%x:%u},{%pd}",
+ dvnode->fid.vid, dvnode->fid.vnode, dentry);
+
+ key = afs_request_key(dvnode->volume->cell);
+ if (IS_ERR(key)) {
+ ret = PTR_ERR(key);
+ goto error;
+ }
+
+ ret = -ERESTARTSYS;
+ if (afs_begin_vnode_operation(&fc, dvnode, key)) {
+ while (afs_select_fileserver(&fc)) {
+ fc.cb_break = afs_calc_vnode_cb_break(dvnode);
+ afs_fs_remove(&fc, dentry->d_name.name, true,
+ data_version);
+ }
+
+ afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
+ ret = afs_end_vnode_operation(&fc);
+ if (ret == 0) {
+ afs_dir_remove_subdir(dentry);
+ if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
+ afs_edit_dir_remove(dvnode, &dentry->d_name,
+ afs_edit_dir_for_rmdir);
+ }
+ }
+
+ key_put(key);
+error:
+ return ret;
+}
+
+/*
+ * 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 int afs_dir_remove_link(struct dentry *dentry, struct key *key,
+ unsigned long d_version_before,
+ unsigned long d_version_after)
+{
+ bool dir_valid;
+ int ret = 0;
+
+ /* There were no intervening changes on the server if the version
+ * number we got back was incremented by exactly 1.
+ */
+ dir_valid = (d_version_after == d_version_before + 1);
+
+ if (d_really_is_positive(dentry)) {
+ struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
+
+ if (dir_valid) {
+ drop_nlink(&vnode->vfs_inode);
+ if (vnode->vfs_inode.i_nlink == 0) {
+ set_bit(AFS_VNODE_DELETED, &vnode->flags);
+ clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
+ }
+ ret = 0;
+ } else {
+ clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
+
+ if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
+ kdebug("AFS_VNODE_DELETED");
+
+ ret = afs_validate(vnode, key);
+ if (ret == -ESTALE)
+ ret = 0;
+ }
+ _debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret);
+ }
+
+ return ret;
+}
+
+/*
+ * Remove a file or symlink from an AFS filesystem.
+ */
+static int afs_unlink(struct inode *dir, struct dentry *dentry)
+{
+ struct afs_fs_cursor fc;
+ struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode;
+ struct key *key;
+ unsigned long d_version = (unsigned long)dentry->d_fsdata;
+ u64 data_version = dvnode->status.data_version;
+ int ret;
+
+ _enter("{%x:%u},{%pd}",
+ dvnode->fid.vid, dvnode->fid.vnode, dentry);
+
+ if (dentry->d_name.len >= AFSNAMEMAX)
+ return -ENAMETOOLONG;
+
+ key = afs_request_key(dvnode->volume->cell);
+ if (IS_ERR(key)) {
+ ret = PTR_ERR(key);
+ goto error;
+ }
+
+ /* 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, key);
+ if (ret < 0)
+ goto error_key;
+ }
+
+ ret = -ERESTARTSYS;
+ if (afs_begin_vnode_operation(&fc, dvnode, key)) {
+ while (afs_select_fileserver(&fc)) {
+ fc.cb_break = afs_calc_vnode_cb_break(dvnode);
+ afs_fs_remove(&fc, dentry->d_name.name, false,
+ data_version);
+ }
+
+ afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
+ ret = afs_end_vnode_operation(&fc);
+ if (ret == 0)
+ ret = afs_dir_remove_link(
+ dentry, key, d_version,
+ (unsigned long)dvnode->status.data_version);
+ if (ret == 0 &&
+ test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
+ afs_edit_dir_remove(dvnode, &dentry->d_name,
+ afs_edit_dir_for_unlink);
+ }
+
+error_key:
+ key_put(key);
+error:
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * create a regular file on an AFS filesystem
+ */
+static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
+ bool excl)
+{
+ struct afs_fs_cursor fc;
+ struct afs_file_status newstatus;
+ struct afs_callback newcb;
+ struct afs_vnode *dvnode = AFS_FS_I(dir);
+ struct afs_fid newfid;
+ struct key *key;
+ u64 data_version = dvnode->status.data_version;
+ int ret;
+
+ mode |= S_IFREG;
+
+ _enter("{%x:%u},{%pd},%ho,",
+ dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
+
+ ret = -ENAMETOOLONG;
+ if (dentry->d_name.len >= AFSNAMEMAX)
+ goto error;
+
+ key = afs_request_key(dvnode->volume->cell);
+ if (IS_ERR(key)) {
+ ret = PTR_ERR(key);
+ goto error;
+ }
+
+ ret = -ERESTARTSYS;
+ if (afs_begin_vnode_operation(&fc, dvnode, key)) {
+ while (afs_select_fileserver(&fc)) {
+ fc.cb_break = afs_calc_vnode_cb_break(dvnode);
+ afs_fs_create(&fc, dentry->d_name.name, mode, data_version,
+ &newfid, &newstatus, &newcb);
+ }
+
+ afs_check_for_remote_deletion(&fc, fc.vnode);
+ afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
+ afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, &newcb);
+ ret = afs_end_vnode_operation(&fc);
+ if (ret < 0)
+ goto error_key;
+ } else {
+ goto error_key;
+ }
+
+ if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
+ afs_edit_dir_add(dvnode, &dentry->d_name, &newfid,
+ afs_edit_dir_for_create);
+
+ key_put(key);
+ _leave(" = 0");
+ return 0;
+
+error_key:
+ key_put(key);
+error:
+ d_drop(dentry);
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * 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_fs_cursor fc;
+ struct afs_vnode *dvnode, *vnode;
+ struct key *key;
+ u64 data_version;
+ int ret;
+
+ vnode = AFS_FS_I(d_inode(from));
+ dvnode = AFS_FS_I(dir);
+ data_version = dvnode->status.data_version;
+
+ _enter("{%x:%u},{%x:%u},{%pd}",
+ vnode->fid.vid, vnode->fid.vnode,
+ dvnode->fid.vid, dvnode->fid.vnode,
+ dentry);
+
+ ret = -ENAMETOOLONG;
+ if (dentry->d_name.len >= AFSNAMEMAX)
+ goto error;
+
+ key = afs_request_key(dvnode->volume->cell);
+ if (IS_ERR(key)) {
+ ret = PTR_ERR(key);
+ goto error;
+ }
+
+ ret = -ERESTARTSYS;
+ if (afs_begin_vnode_operation(&fc, dvnode, key)) {
+ if (mutex_lock_interruptible_nested(&vnode->io_lock, 1) < 0) {
+ afs_end_vnode_operation(&fc);
+ goto error_key;
+ }
+
+ while (afs_select_fileserver(&fc)) {
+ fc.cb_break = afs_calc_vnode_cb_break(dvnode);
+ fc.cb_break_2 = afs_calc_vnode_cb_break(vnode);
+ afs_fs_link(&fc, vnode, dentry->d_name.name, data_version);
+ }
+
+ afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
+ afs_vnode_commit_status(&fc, vnode, fc.cb_break_2);
+ ihold(&vnode->vfs_inode);
+ d_instantiate(dentry, &vnode->vfs_inode);
+
+ mutex_unlock(&vnode->io_lock);
+ ret = afs_end_vnode_operation(&fc);
+ if (ret < 0)
+ goto error_key;
+ } else {
+ goto error_key;
+ }
+
+ if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
+ afs_edit_dir_add(dvnode, &dentry->d_name, &vnode->fid,
+ afs_edit_dir_for_link);
+
+ key_put(key);
+ _leave(" = 0");
+ return 0;
+
+error_key:
+ key_put(key);
+error:
+ d_drop(dentry);
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * create a symlink in an AFS filesystem
+ */
+static int afs_symlink(struct inode *dir, struct dentry *dentry,
+ const char *content)
+{
+ struct afs_fs_cursor fc;
+ struct afs_file_status newstatus;
+ struct afs_vnode *dvnode = AFS_FS_I(dir);
+ struct afs_fid newfid;
+ struct key *key;
+ u64 data_version = dvnode->status.data_version;
+ int ret;
+
+ _enter("{%x:%u},{%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;
+
+ key = afs_request_key(dvnode->volume->cell);
+ if (IS_ERR(key)) {
+ ret = PTR_ERR(key);
+ goto error;
+ }
+
+ ret = -ERESTARTSYS;
+ if (afs_begin_vnode_operation(&fc, dvnode, key)) {
+ while (afs_select_fileserver(&fc)) {
+ fc.cb_break = afs_calc_vnode_cb_break(dvnode);
+ afs_fs_symlink(&fc, dentry->d_name.name,
+ content, data_version,
+ &newfid, &newstatus);
+ }
+
+ afs_check_for_remote_deletion(&fc, fc.vnode);
+ afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
+ afs_vnode_new_inode(&fc, dentry, &newfid, &newstatus, NULL);
+ ret = afs_end_vnode_operation(&fc);
+ if (ret < 0)
+ goto error_key;
+ } else {
+ goto error_key;
+ }
+
+ if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
+ afs_edit_dir_add(dvnode, &dentry->d_name, &newfid,
+ afs_edit_dir_for_symlink);
+
+ key_put(key);
+ _leave(" = 0");
+ return 0;
+
+error_key:
+ key_put(key);
+error:
+ d_drop(dentry);
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * rename a file in an AFS filesystem and/or move it between directories
+ */
+static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
+ struct inode *new_dir, struct dentry *new_dentry,
+ unsigned int flags)
+{
+ struct afs_fs_cursor fc;
+ struct afs_vnode *orig_dvnode, *new_dvnode, *vnode;
+ struct key *key;
+ u64 orig_data_version, new_data_version;
+ bool new_negative = d_is_negative(new_dentry);
+ int ret;
+
+ if (flags)
+ return -EINVAL;
+
+ vnode = AFS_FS_I(d_inode(old_dentry));
+ orig_dvnode = AFS_FS_I(old_dir);
+ new_dvnode = AFS_FS_I(new_dir);
+ orig_data_version = orig_dvnode->status.data_version;
+ new_data_version = new_dvnode->status.data_version;
+
+ _enter("{%x:%u},{%x:%u},{%x:%u},{%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);
+
+ key = afs_request_key(orig_dvnode->volume->cell);
+ if (IS_ERR(key)) {
+ ret = PTR_ERR(key);
+ goto error;
+ }
+
+ ret = -ERESTARTSYS;
+ if (afs_begin_vnode_operation(&fc, orig_dvnode, key)) {
+ if (orig_dvnode != new_dvnode) {
+ if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) {
+ afs_end_vnode_operation(&fc);
+ goto error_key;
+ }
+ }
+ while (afs_select_fileserver(&fc)) {
+ fc.cb_break = afs_calc_vnode_cb_break(orig_dvnode);
+ fc.cb_break_2 = afs_calc_vnode_cb_break(new_dvnode);
+ afs_fs_rename(&fc, old_dentry->d_name.name,
+ new_dvnode, new_dentry->d_name.name,
+ orig_data_version, new_data_version);
+ }
+
+ afs_vnode_commit_status(&fc, orig_dvnode, fc.cb_break);
+ afs_vnode_commit_status(&fc, new_dvnode, fc.cb_break_2);
+ if (orig_dvnode != new_dvnode)
+ mutex_unlock(&new_dvnode->io_lock);
+ ret = afs_end_vnode_operation(&fc);
+ if (ret < 0)
+ goto error_key;
+ }
+
+ if (ret == 0) {
+ if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags))
+ afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name,
+ afs_edit_dir_for_rename);
+
+ if (!new_negative &&
+ test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags))
+ afs_edit_dir_remove(new_dvnode, &new_dentry->d_name,
+ afs_edit_dir_for_rename);
+
+ if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags))
+ afs_edit_dir_add(new_dvnode, &new_dentry->d_name,
+ &vnode->fid, afs_edit_dir_for_rename);
+ }
+
+error_key:
+ key_put(key);
+error:
+ _leave(" = %d", ret);
+ return ret;
+}
+
+/*
+ * Release a directory page and clean up its private state if it's not busy
+ * - return true if the page can now be released, false if not
+ */
+static int afs_dir_releasepage(struct page *page, gfp_t gfp_flags)
+{
+ struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host);
+
+ _enter("{{%x:%u}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, page->index);
+
+ set_page_private(page, 0);
+ ClearPagePrivate(page);
+
+ /* The directory will need reloading. */
+ if (test_and_clear_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
+ afs_stat_v(dvnode, n_relpg);
+ return 1;
+}
+
+/*
+ * invalidate part or all of a page
+ * - release a page and clean up its private data if offset is 0 (indicating
+ * the entire page)
+ */
+static void afs_dir_invalidatepage(struct page *page, unsigned int offset,
+ unsigned int length)
+{
+ struct afs_vnode *dvnode = AFS_FS_I(page->mapping->host);
+
+ _enter("{%lu},%u,%u", page->index, offset, length);
+
+ BUG_ON(!PageLocked(page));
+
+ /* 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 page is being invalidated */
+ if (offset == 0 && length == PAGE_SIZE) {
+ set_page_private(page, 0);
+ ClearPagePrivate(page);
+ }
+}