// 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 (dhowells@redhat.com)
|
*/
|
|
#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 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,
|
};
|
|
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,
|
.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];
|
};
|
|
/*
|
* 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);
|
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 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;
|
}
|
|
/*
|
* Check the contents of a directory that we've just read.
|
*/
|
static bool afs_dir_check_pages(struct afs_vnode *dvnode, struct afs_read *req)
|
{
|
struct afs_xdr_dir_page *dbuf;
|
unsigned int i, j, qty = PAGE_SIZE / sizeof(union afs_xdr_dir_block);
|
|
for (i = 0; i < req->nr_pages; i++)
|
if (!afs_dir_check_page(dvnode, req->pages[i], req->actual_len))
|
goto bad;
|
return true;
|
|
bad:
|
pr_warn("DIR %llx:%llx f=%llx l=%llx al=%llx r=%llx\n",
|
dvnode->fid.vid, dvnode->fid.vnode,
|
req->file_size, req->len, req->actual_len, req->remain);
|
pr_warn("DIR %llx %x %x %x\n",
|
req->pos, req->index, req->nr_pages, req->offset);
|
|
for (i = 0; i < req->nr_pages; i++) {
|
dbuf = kmap(req->pages[i]);
|
for (j = 0; j < qty; j++) {
|
union afs_xdr_dir_block *block = &dbuf->blocks[j];
|
|
pr_warn("[%02x] %32phN\n", i * qty + j, block);
|
}
|
kunmap(req->pages[i]);
|
}
|
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(afs_bad(dvnode, afs_file_error_dir_small));
|
if (i_size > 2048 * 1024) {
|
trace_afs_file_error(dvnode, -EFBIG, afs_file_error_dir_big);
|
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(struct_size(req, array, 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;
|
|
attach_page_private(req->pages[i], (void *)1);
|
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)) {
|
trace_afs_reload_dir(dvnode);
|
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;
|
if (!afs_dir_check_pages(dvnode, req))
|
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 afs_vnode *dvnode,
|
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 afs_bad(dvnode, afs_file_error_dir_over_end);
|
}
|
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 afs_bad(dvnode, afs_file_error_dir_unmarked_ext);
|
}
|
|
_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) {
|
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);
|
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);
|
*_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) {
|
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 = afs_bad(dvnode, afs_file_error_dir_missing_page);
|
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(dvnode, 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)
|
{
|
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 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,
|
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;
|
}
|
|
ret = -ENOENT;
|
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 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[1].vnode = ino;
|
cookie->fids[1].unique = dtype;
|
cookie->found = 1;
|
if (cookie->one_only)
|
return -1;
|
}
|
|
ret = cookie->nr_fids >= 50 ? -1 : 0;
|
_leave(" = %d", ret);
|
return ret;
|
}
|
|
/*
|
* 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->vfs_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->vfs_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->vfs_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 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->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->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);
|
}
|
}
|
|
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->vfs_inode);
|
if (vnode->vfs_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->vfs_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 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->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->vfs_inode);
|
d_instantiate(op->dentry, &vp->vnode->vfs_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;
|
}
|
|
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:
|
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 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;
|
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 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);
|
|
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 */
|
ret = -ENOMEM;
|
op->rename.tmp = d_alloc(new_dentry->d_parent,
|
&new_dentry->d_name);
|
if (!op->rename.tmp)
|
goto error;
|
|
ret = afs_sillyrename(new_dvnode,
|
AFS_FS_I(d_inode(new_dentry)),
|
new_dentry, op->key);
|
if (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 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("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, page->index);
|
|
detach_page_private(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)
|
detach_page_private(page);
|
}
|
