mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-25 02:09:42 +00:00
1143 lines
26 KiB
C
1143 lines
26 KiB
C
/* dir.c: AFS filesystem directory handling
|
|
*
|
|
* Copyright (C) 2002 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/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/ctype.h>
|
|
#include <linux/sched.h>
|
|
#include "internal.h"
|
|
|
|
static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
|
|
struct nameidata *nd);
|
|
static int afs_dir_open(struct inode *inode, struct file *file);
|
|
static int afs_readdir(struct file *file, void *dirent, filldir_t filldir);
|
|
static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd);
|
|
static int afs_d_delete(struct dentry *dentry);
|
|
static void afs_d_release(struct dentry *dentry);
|
|
static int afs_lookup_filldir(void *_cookie, const char *name, int nlen,
|
|
loff_t fpos, u64 ino, unsigned dtype);
|
|
static int afs_create(struct inode *dir, struct dentry *dentry, int mode,
|
|
struct nameidata *nd);
|
|
static int afs_mkdir(struct inode *dir, struct dentry *dentry, int 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);
|
|
|
|
const struct file_operations afs_dir_file_operations = {
|
|
.open = afs_dir_open,
|
|
.release = afs_release,
|
|
.readdir = 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,
|
|
};
|
|
|
|
static const struct dentry_operations afs_fs_dentry_operations = {
|
|
.d_revalidate = afs_d_revalidate,
|
|
.d_delete = afs_d_delete,
|
|
.d_release = afs_d_release,
|
|
};
|
|
|
|
#define AFS_DIR_HASHTBL_SIZE 128
|
|
#define AFS_DIR_DIRENT_SIZE 32
|
|
#define AFS_DIRENT_PER_BLOCK 64
|
|
|
|
union afs_dirent {
|
|
struct {
|
|
uint8_t valid;
|
|
uint8_t unused[1];
|
|
__be16 hash_next;
|
|
__be32 vnode;
|
|
__be32 unique;
|
|
uint8_t name[16];
|
|
uint8_t overflow[4]; /* if any char of the name (inc
|
|
* NUL) reaches here, consume
|
|
* the next dirent too */
|
|
} u;
|
|
uint8_t extended_name[32];
|
|
};
|
|
|
|
/* AFS directory page header (one at the beginning of every 2048-byte chunk) */
|
|
struct afs_dir_pagehdr {
|
|
__be16 npages;
|
|
__be16 magic;
|
|
#define AFS_DIR_MAGIC htons(1234)
|
|
uint8_t nentries;
|
|
uint8_t bitmap[8];
|
|
uint8_t pad[19];
|
|
};
|
|
|
|
/* directory block layout */
|
|
union afs_dir_block {
|
|
|
|
struct afs_dir_pagehdr pagehdr;
|
|
|
|
struct {
|
|
struct afs_dir_pagehdr pagehdr;
|
|
uint8_t alloc_ctrs[128];
|
|
/* dir hash table */
|
|
uint16_t hashtable[AFS_DIR_HASHTBL_SIZE];
|
|
} hdr;
|
|
|
|
union afs_dirent dirents[AFS_DIRENT_PER_BLOCK];
|
|
};
|
|
|
|
/* layout on a linux VM page */
|
|
struct afs_dir_page {
|
|
union afs_dir_block blocks[PAGE_SIZE / sizeof(union afs_dir_block)];
|
|
};
|
|
|
|
struct afs_lookup_cookie {
|
|
struct afs_fid fid;
|
|
const char *name;
|
|
size_t nlen;
|
|
int found;
|
|
};
|
|
|
|
/*
|
|
* check that a directory page is valid
|
|
*/
|
|
static inline void afs_dir_check_page(struct inode *dir, struct page *page)
|
|
{
|
|
struct afs_dir_page *dbuf;
|
|
loff_t latter;
|
|
int tmp, qty;
|
|
|
|
#if 0
|
|
/* check the page count */
|
|
qty = desc.size / sizeof(dbuf->blocks[0]);
|
|
if (qty == 0)
|
|
goto error;
|
|
|
|
if (page->index == 0 && qty != ntohs(dbuf->blocks[0].pagehdr.npages)) {
|
|
printk("kAFS: %s(%lu): wrong number of dir blocks %d!=%hu\n",
|
|
__func__, dir->i_ino, qty,
|
|
ntohs(dbuf->blocks[0].pagehdr.npages));
|
|
goto error;
|
|
}
|
|
#endif
|
|
|
|
/* determine how many magic numbers there should be in this page */
|
|
latter = dir->i_size - page_offset(page);
|
|
if (latter >= PAGE_SIZE)
|
|
qty = PAGE_SIZE;
|
|
else
|
|
qty = latter;
|
|
qty /= sizeof(union afs_dir_block);
|
|
|
|
/* check them */
|
|
dbuf = page_address(page);
|
|
for (tmp = 0; tmp < qty; tmp++) {
|
|
if (dbuf->blocks[tmp].pagehdr.magic != AFS_DIR_MAGIC) {
|
|
printk("kAFS: %s(%lu): bad magic %d/%d is %04hx\n",
|
|
__func__, dir->i_ino, tmp, qty,
|
|
ntohs(dbuf->blocks[tmp].pagehdr.magic));
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
SetPageChecked(page);
|
|
return;
|
|
|
|
error:
|
|
SetPageChecked(page);
|
|
SetPageError(page);
|
|
}
|
|
|
|
/*
|
|
* discard a page cached in the pagecache
|
|
*/
|
|
static inline void afs_dir_put_page(struct page *page)
|
|
{
|
|
kunmap(page);
|
|
page_cache_release(page);
|
|
}
|
|
|
|
/*
|
|
* get a page into the pagecache
|
|
*/
|
|
static struct page *afs_dir_get_page(struct inode *dir, unsigned long index,
|
|
struct key *key)
|
|
{
|
|
struct page *page;
|
|
struct file file = {
|
|
.private_data = key,
|
|
};
|
|
|
|
_enter("{%lu},%lu", dir->i_ino, index);
|
|
|
|
page = read_mapping_page(dir->i_mapping, index, &file);
|
|
if (!IS_ERR(page)) {
|
|
kmap(page);
|
|
if (!PageChecked(page))
|
|
afs_dir_check_page(dir, page);
|
|
if (PageError(page))
|
|
goto fail;
|
|
}
|
|
return page;
|
|
|
|
fail:
|
|
afs_dir_put_page(page);
|
|
_leave(" = -EIO");
|
|
return ERR_PTR(-EIO);
|
|
}
|
|
|
|
/*
|
|
* 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_dir_block) != 2048);
|
|
BUILD_BUG_ON(sizeof(union afs_dirent) != 32);
|
|
|
|
if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags))
|
|
return -ENOENT;
|
|
|
|
return afs_open(inode, file);
|
|
}
|
|
|
|
/*
|
|
* deal with one block in an AFS directory
|
|
*/
|
|
static int afs_dir_iterate_block(unsigned *fpos,
|
|
union afs_dir_block *block,
|
|
unsigned blkoff,
|
|
void *cookie,
|
|
filldir_t filldir)
|
|
{
|
|
union afs_dirent *dire;
|
|
unsigned offset, next, curr;
|
|
size_t nlen;
|
|
int tmp, ret;
|
|
|
|
_enter("%u,%x,%p,,",*fpos,blkoff,block);
|
|
|
|
curr = (*fpos - blkoff) / sizeof(union afs_dirent);
|
|
|
|
/* walk through the block, an entry at a time */
|
|
for (offset = AFS_DIRENT_PER_BLOCK - block->pagehdr.nentries;
|
|
offset < AFS_DIRENT_PER_BLOCK;
|
|
offset = next
|
|
) {
|
|
next = offset + 1;
|
|
|
|
/* skip entries marked unused in the bitmap */
|
|
if (!(block->pagehdr.bitmap[offset / 8] &
|
|
(1 << (offset % 8)))) {
|
|
_debug("ENT[%Zu.%u]: unused",
|
|
blkoff / sizeof(union afs_dir_block), offset);
|
|
if (offset >= curr)
|
|
*fpos = blkoff +
|
|
next * sizeof(union afs_dirent);
|
|
continue;
|
|
}
|
|
|
|
/* got a valid entry */
|
|
dire = &block->dirents[offset];
|
|
nlen = strnlen(dire->u.name,
|
|
sizeof(*block) -
|
|
offset * sizeof(union afs_dirent));
|
|
|
|
_debug("ENT[%Zu.%u]: %s %Zu \"%s\"",
|
|
blkoff / sizeof(union afs_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_dirent)) {
|
|
if (next >= AFS_DIRENT_PER_BLOCK) {
|
|
_debug("ENT[%Zu.%u]:"
|
|
" %u travelled beyond end dir block"
|
|
" (len %u/%Zu)",
|
|
blkoff / sizeof(union afs_dir_block),
|
|
offset, next, tmp, nlen);
|
|
return -EIO;
|
|
}
|
|
if (!(block->pagehdr.bitmap[next / 8] &
|
|
(1 << (next % 8)))) {
|
|
_debug("ENT[%Zu.%u]:"
|
|
" %u unmarked extension (len %u/%Zu)",
|
|
blkoff / sizeof(union afs_dir_block),
|
|
offset, next, tmp, nlen);
|
|
return -EIO;
|
|
}
|
|
|
|
_debug("ENT[%Zu.%u]: ext %u/%Zu",
|
|
blkoff / sizeof(union afs_dir_block),
|
|
next, tmp, nlen);
|
|
next++;
|
|
}
|
|
|
|
/* skip if starts before the current position */
|
|
if (offset < curr)
|
|
continue;
|
|
|
|
/* found the next entry */
|
|
ret = filldir(cookie,
|
|
dire->u.name,
|
|
nlen,
|
|
blkoff + offset * sizeof(union afs_dirent),
|
|
ntohl(dire->u.vnode),
|
|
filldir == afs_lookup_filldir ?
|
|
ntohl(dire->u.unique) : DT_UNKNOWN);
|
|
if (ret < 0) {
|
|
_leave(" = 0 [full]");
|
|
return 0;
|
|
}
|
|
|
|
*fpos = blkoff + next * sizeof(union afs_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, unsigned *fpos, void *cookie,
|
|
filldir_t filldir, struct key *key)
|
|
{
|
|
union afs_dir_block *dblock;
|
|
struct afs_dir_page *dbuf;
|
|
struct page *page;
|
|
unsigned blkoff, limit;
|
|
int ret;
|
|
|
|
_enter("{%lu},%u,,", dir->i_ino, *fpos);
|
|
|
|
if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) {
|
|
_leave(" = -ESTALE");
|
|
return -ESTALE;
|
|
}
|
|
|
|
/* round the file position up to the next entry boundary */
|
|
*fpos += sizeof(union afs_dirent) - 1;
|
|
*fpos &= ~(sizeof(union afs_dirent) - 1);
|
|
|
|
/* walk through the blocks in sequence */
|
|
ret = 0;
|
|
while (*fpos < dir->i_size) {
|
|
blkoff = *fpos & ~(sizeof(union afs_dir_block) - 1);
|
|
|
|
/* fetch the appropriate page from the directory */
|
|
page = afs_dir_get_page(dir, blkoff / PAGE_SIZE, key);
|
|
if (IS_ERR(page)) {
|
|
ret = PTR_ERR(page);
|
|
break;
|
|
}
|
|
|
|
limit = blkoff & ~(PAGE_SIZE - 1);
|
|
|
|
dbuf = page_address(page);
|
|
|
|
/* deal with the individual blocks stashed on this page */
|
|
do {
|
|
dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) /
|
|
sizeof(union afs_dir_block)];
|
|
ret = afs_dir_iterate_block(fpos, dblock, blkoff,
|
|
cookie, filldir);
|
|
if (ret != 1) {
|
|
afs_dir_put_page(page);
|
|
goto out;
|
|
}
|
|
|
|
blkoff += sizeof(union afs_dir_block);
|
|
|
|
} while (*fpos < dir->i_size && blkoff < limit);
|
|
|
|
afs_dir_put_page(page);
|
|
ret = 0;
|
|
}
|
|
|
|
out:
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* read an AFS directory
|
|
*/
|
|
static int afs_readdir(struct file *file, void *cookie, filldir_t filldir)
|
|
{
|
|
unsigned fpos;
|
|
int ret;
|
|
|
|
_enter("{%Ld,{%lu}}",
|
|
file->f_pos, file->f_path.dentry->d_inode->i_ino);
|
|
|
|
ASSERT(file->private_data != NULL);
|
|
|
|
fpos = file->f_pos;
|
|
ret = afs_dir_iterate(file->f_path.dentry->d_inode, &fpos,
|
|
cookie, filldir, file->private_data);
|
|
file->f_pos = fpos;
|
|
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* 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(void *_cookie, const char *name, int nlen,
|
|
loff_t fpos, u64 ino, unsigned dtype)
|
|
{
|
|
struct afs_lookup_cookie *cookie = _cookie;
|
|
|
|
_enter("{%s,%Zu},%s,%u,,%llu,%u",
|
|
cookie->name, cookie->nlen, name, nlen,
|
|
(unsigned long long) ino, dtype);
|
|
|
|
/* insanity checks first */
|
|
BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048);
|
|
BUILD_BUG_ON(sizeof(union afs_dirent) != 32);
|
|
|
|
if (cookie->nlen != nlen || memcmp(cookie->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 in a directory
|
|
* - just returns the FID the dentry name maps to if found
|
|
*/
|
|
static int afs_do_lookup(struct inode *dir, struct dentry *dentry,
|
|
struct afs_fid *fid, struct key *key)
|
|
{
|
|
struct afs_lookup_cookie cookie;
|
|
struct afs_super_info *as;
|
|
unsigned fpos;
|
|
int ret;
|
|
|
|
_enter("{%lu},%p{%s},", dir->i_ino, dentry, dentry->d_name.name);
|
|
|
|
as = dir->i_sb->s_fs_info;
|
|
|
|
/* search the directory */
|
|
cookie.name = dentry->d_name.name;
|
|
cookie.nlen = dentry->d_name.len;
|
|
cookie.fid.vid = as->volume->vid;
|
|
cookie.found = 0;
|
|
|
|
fpos = 0;
|
|
ret = afs_dir_iterate(dir, &fpos, &cookie, afs_lookup_filldir,
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* look up an entry in a directory
|
|
*/
|
|
static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
|
|
struct nameidata *nd)
|
|
{
|
|
struct afs_vnode *vnode;
|
|
struct afs_fid fid;
|
|
struct inode *inode;
|
|
struct key *key;
|
|
int ret;
|
|
|
|
vnode = AFS_FS_I(dir);
|
|
|
|
_enter("{%x:%u},%p{%s},",
|
|
vnode->fid.vid, vnode->fid.vnode, dentry, dentry->d_name.name);
|
|
|
|
ASSERTCMP(dentry->d_inode, ==, NULL);
|
|
|
|
if (dentry->d_name.len >= AFSNAMEMAX) {
|
|
_leave(" = -ENAMETOOLONG");
|
|
return ERR_PTR(-ENAMETOOLONG);
|
|
}
|
|
|
|
if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
|
|
_leave(" = -ESTALE");
|
|
return ERR_PTR(-ESTALE);
|
|
}
|
|
|
|
key = afs_request_key(vnode->volume->cell);
|
|
if (IS_ERR(key)) {
|
|
_leave(" = %ld [key]", PTR_ERR(key));
|
|
return ERR_CAST(key);
|
|
}
|
|
|
|
ret = afs_validate(vnode, key);
|
|
if (ret < 0) {
|
|
key_put(key);
|
|
_leave(" = %d [val]", ret);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
ret = afs_do_lookup(dir, dentry, &fid, key);
|
|
if (ret < 0) {
|
|
key_put(key);
|
|
if (ret == -ENOENT) {
|
|
d_add(dentry, NULL);
|
|
_leave(" = NULL [negative]");
|
|
return NULL;
|
|
}
|
|
_leave(" = %d [do]", ret);
|
|
return ERR_PTR(ret);
|
|
}
|
|
dentry->d_fsdata = (void *)(unsigned long) vnode->status.data_version;
|
|
|
|
/* instantiate the dentry */
|
|
inode = afs_iget(dir->i_sb, key, &fid, NULL, NULL);
|
|
key_put(key);
|
|
if (IS_ERR(inode)) {
|
|
_leave(" = %ld", PTR_ERR(inode));
|
|
return ERR_CAST(inode);
|
|
}
|
|
|
|
dentry->d_op = &afs_fs_dentry_operations;
|
|
|
|
d_add(dentry, inode);
|
|
_leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%llu }",
|
|
fid.vnode,
|
|
fid.unique,
|
|
dentry->d_inode->i_ino,
|
|
(unsigned long long)dentry->d_inode->i_version);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* 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, struct nameidata *nd)
|
|
{
|
|
struct afs_vnode *vnode, *dir;
|
|
struct afs_fid fid;
|
|
struct dentry *parent;
|
|
struct key *key;
|
|
void *dir_version;
|
|
int ret;
|
|
|
|
vnode = AFS_FS_I(dentry->d_inode);
|
|
|
|
if (dentry->d_inode)
|
|
_enter("{v={%x:%u} n=%s fl=%lx},",
|
|
vnode->fid.vid, vnode->fid.vnode, dentry->d_name.name,
|
|
vnode->flags);
|
|
else
|
|
_enter("{neg n=%s}", dentry->d_name.name);
|
|
|
|
key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell);
|
|
if (IS_ERR(key))
|
|
key = NULL;
|
|
|
|
/* lock down the parent dentry so we can peer at it */
|
|
parent = dget_parent(dentry);
|
|
if (!parent->d_inode)
|
|
goto out_bad;
|
|
|
|
dir = AFS_FS_I(parent->d_inode);
|
|
|
|
/* validate the parent directory */
|
|
if (test_bit(AFS_VNODE_MODIFIED, &dir->flags))
|
|
afs_validate(dir, key);
|
|
|
|
if (test_bit(AFS_VNODE_DELETED, &dir->flags)) {
|
|
_debug("%s: parent dir deleted", dentry->d_name.name);
|
|
goto out_bad;
|
|
}
|
|
|
|
dir_version = (void *) (unsigned long) dir->status.data_version;
|
|
if (dentry->d_fsdata == dir_version)
|
|
goto out_valid; /* the dir contents are unchanged */
|
|
|
|
_debug("dir modified");
|
|
|
|
/* search the directory for this vnode */
|
|
ret = afs_do_lookup(&dir->vfs_inode, dentry, &fid, key);
|
|
switch (ret) {
|
|
case 0:
|
|
/* the filename maps to something */
|
|
if (!dentry->d_inode)
|
|
goto out_bad;
|
|
if (is_bad_inode(dentry->d_inode)) {
|
|
printk("kAFS: afs_d_revalidate: %s/%s has bad inode\n",
|
|
parent->d_name.name, dentry->d_name.name);
|
|
goto out_bad;
|
|
}
|
|
|
|
/* if the vnode ID has changed, then the dirent points to a
|
|
* different file */
|
|
if (fid.vnode != vnode->fid.vnode) {
|
|
_debug("%s: dirent changed [%u != %u]",
|
|
dentry->d_name.name, 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("%s: file deleted (uq %u -> %u I:%llu)",
|
|
dentry->d_name.name, fid.unique,
|
|
vnode->fid.unique,
|
|
(unsigned long long)dentry->d_inode->i_version);
|
|
spin_lock(&vnode->lock);
|
|
set_bit(AFS_VNODE_DELETED, &vnode->flags);
|
|
spin_unlock(&vnode->lock);
|
|
goto not_found;
|
|
}
|
|
goto out_valid;
|
|
|
|
case -ENOENT:
|
|
/* the filename is unknown */
|
|
_debug("%s: dirent not found", dentry->d_name.name);
|
|
if (dentry->d_inode)
|
|
goto not_found;
|
|
goto out_valid;
|
|
|
|
default:
|
|
_debug("failed to iterate dir %s: %d",
|
|
parent->d_name.name, ret);
|
|
goto out_bad;
|
|
}
|
|
|
|
out_valid:
|
|
dentry->d_fsdata = dir_version;
|
|
out_skip:
|
|
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:
|
|
if (dentry->d_inode) {
|
|
/* don't unhash if we have submounts */
|
|
if (have_submounts(dentry))
|
|
goto out_skip;
|
|
}
|
|
|
|
_debug("dropping dentry %s/%s",
|
|
parent->d_name.name, dentry->d_name.name);
|
|
shrink_dcache_parent(dentry);
|
|
d_drop(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(struct dentry *dentry)
|
|
{
|
|
_enter("%s", dentry->d_name.name);
|
|
|
|
if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
|
|
goto zap;
|
|
|
|
if (dentry->d_inode &&
|
|
test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dentry->d_inode)->flags))
|
|
goto zap;
|
|
|
|
_leave(" = 0 [keep]");
|
|
return 0;
|
|
|
|
zap:
|
|
_leave(" = 1 [zap]");
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* handle dentry release
|
|
*/
|
|
static void afs_d_release(struct dentry *dentry)
|
|
{
|
|
_enter("%s", dentry->d_name.name);
|
|
}
|
|
|
|
/*
|
|
* create a directory on an AFS filesystem
|
|
*/
|
|
static int afs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
|
|
{
|
|
struct afs_file_status status;
|
|
struct afs_callback cb;
|
|
struct afs_server *server;
|
|
struct afs_vnode *dvnode, *vnode;
|
|
struct afs_fid fid;
|
|
struct inode *inode;
|
|
struct key *key;
|
|
int ret;
|
|
|
|
dvnode = AFS_FS_I(dir);
|
|
|
|
_enter("{%x:%u},{%s},%o",
|
|
dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, 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;
|
|
}
|
|
|
|
mode |= S_IFDIR;
|
|
ret = afs_vnode_create(dvnode, key, dentry->d_name.name,
|
|
mode, &fid, &status, &cb, &server);
|
|
if (ret < 0)
|
|
goto mkdir_error;
|
|
|
|
inode = afs_iget(dir->i_sb, key, &fid, &status, &cb);
|
|
if (IS_ERR(inode)) {
|
|
/* ENOMEM at a really inconvenient time - just abandon the new
|
|
* directory on the server */
|
|
ret = PTR_ERR(inode);
|
|
goto iget_error;
|
|
}
|
|
|
|
/* apply the status report we've got for the new vnode */
|
|
vnode = AFS_FS_I(inode);
|
|
spin_lock(&vnode->lock);
|
|
vnode->update_cnt++;
|
|
spin_unlock(&vnode->lock);
|
|
afs_vnode_finalise_status_update(vnode, server);
|
|
afs_put_server(server);
|
|
|
|
d_instantiate(dentry, inode);
|
|
if (d_unhashed(dentry)) {
|
|
_debug("not hashed");
|
|
d_rehash(dentry);
|
|
}
|
|
key_put(key);
|
|
_leave(" = 0");
|
|
return 0;
|
|
|
|
iget_error:
|
|
afs_put_server(server);
|
|
mkdir_error:
|
|
key_put(key);
|
|
error:
|
|
d_drop(dentry);
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* remove a directory from an AFS filesystem
|
|
*/
|
|
static int afs_rmdir(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct afs_vnode *dvnode, *vnode;
|
|
struct key *key;
|
|
int ret;
|
|
|
|
dvnode = AFS_FS_I(dir);
|
|
|
|
_enter("{%x:%u},{%s}",
|
|
dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name);
|
|
|
|
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 = afs_vnode_remove(dvnode, key, dentry->d_name.name, true);
|
|
if (ret < 0)
|
|
goto rmdir_error;
|
|
|
|
if (dentry->d_inode) {
|
|
vnode = AFS_FS_I(dentry->d_inode);
|
|
clear_nlink(&vnode->vfs_inode);
|
|
set_bit(AFS_VNODE_DELETED, &vnode->flags);
|
|
afs_discard_callback_on_delete(vnode);
|
|
}
|
|
|
|
key_put(key);
|
|
_leave(" = 0");
|
|
return 0;
|
|
|
|
rmdir_error:
|
|
key_put(key);
|
|
error:
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* remove a file from an AFS filesystem
|
|
*/
|
|
static int afs_unlink(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct afs_vnode *dvnode, *vnode;
|
|
struct key *key;
|
|
int ret;
|
|
|
|
dvnode = AFS_FS_I(dir);
|
|
|
|
_enter("{%x:%u},{%s}",
|
|
dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name);
|
|
|
|
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;
|
|
}
|
|
|
|
if (dentry->d_inode) {
|
|
vnode = AFS_FS_I(dentry->d_inode);
|
|
|
|
/* make sure we have a callback promise on the victim */
|
|
ret = afs_validate(vnode, key);
|
|
if (ret < 0)
|
|
goto error;
|
|
}
|
|
|
|
ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, false);
|
|
if (ret < 0)
|
|
goto remove_error;
|
|
|
|
if (dentry->d_inode) {
|
|
/* if the file wasn't 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...
|
|
*/
|
|
vnode = AFS_FS_I(dentry->d_inode);
|
|
if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
|
|
_debug("AFS_VNODE_DELETED");
|
|
if (test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags))
|
|
_debug("AFS_VNODE_CB_BROKEN");
|
|
set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
|
|
ret = afs_validate(vnode, key);
|
|
_debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret);
|
|
}
|
|
|
|
key_put(key);
|
|
_leave(" = 0");
|
|
return 0;
|
|
|
|
remove_error:
|
|
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, int mode,
|
|
struct nameidata *nd)
|
|
{
|
|
struct afs_file_status status;
|
|
struct afs_callback cb;
|
|
struct afs_server *server;
|
|
struct afs_vnode *dvnode, *vnode;
|
|
struct afs_fid fid;
|
|
struct inode *inode;
|
|
struct key *key;
|
|
int ret;
|
|
|
|
dvnode = AFS_FS_I(dir);
|
|
|
|
_enter("{%x:%u},{%s},%o,",
|
|
dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, 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;
|
|
}
|
|
|
|
mode |= S_IFREG;
|
|
ret = afs_vnode_create(dvnode, key, dentry->d_name.name,
|
|
mode, &fid, &status, &cb, &server);
|
|
if (ret < 0)
|
|
goto create_error;
|
|
|
|
inode = afs_iget(dir->i_sb, key, &fid, &status, &cb);
|
|
if (IS_ERR(inode)) {
|
|
/* ENOMEM at a really inconvenient time - just abandon the new
|
|
* directory on the server */
|
|
ret = PTR_ERR(inode);
|
|
goto iget_error;
|
|
}
|
|
|
|
/* apply the status report we've got for the new vnode */
|
|
vnode = AFS_FS_I(inode);
|
|
spin_lock(&vnode->lock);
|
|
vnode->update_cnt++;
|
|
spin_unlock(&vnode->lock);
|
|
afs_vnode_finalise_status_update(vnode, server);
|
|
afs_put_server(server);
|
|
|
|
d_instantiate(dentry, inode);
|
|
if (d_unhashed(dentry)) {
|
|
_debug("not hashed");
|
|
d_rehash(dentry);
|
|
}
|
|
key_put(key);
|
|
_leave(" = 0");
|
|
return 0;
|
|
|
|
iget_error:
|
|
afs_put_server(server);
|
|
create_error:
|
|
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_vnode *dvnode, *vnode;
|
|
struct key *key;
|
|
int ret;
|
|
|
|
vnode = AFS_FS_I(from->d_inode);
|
|
dvnode = AFS_FS_I(dir);
|
|
|
|
_enter("{%x:%u},{%x:%u},{%s}",
|
|
vnode->fid.vid, vnode->fid.vnode,
|
|
dvnode->fid.vid, dvnode->fid.vnode,
|
|
dentry->d_name.name);
|
|
|
|
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 = afs_vnode_link(dvnode, vnode, key, dentry->d_name.name);
|
|
if (ret < 0)
|
|
goto link_error;
|
|
|
|
atomic_inc(&vnode->vfs_inode.i_count);
|
|
d_instantiate(dentry, &vnode->vfs_inode);
|
|
key_put(key);
|
|
_leave(" = 0");
|
|
return 0;
|
|
|
|
link_error:
|
|
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_file_status status;
|
|
struct afs_server *server;
|
|
struct afs_vnode *dvnode, *vnode;
|
|
struct afs_fid fid;
|
|
struct inode *inode;
|
|
struct key *key;
|
|
int ret;
|
|
|
|
dvnode = AFS_FS_I(dir);
|
|
|
|
_enter("{%x:%u},{%s},%s",
|
|
dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name,
|
|
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 = afs_vnode_symlink(dvnode, key, dentry->d_name.name, content,
|
|
&fid, &status, &server);
|
|
if (ret < 0)
|
|
goto create_error;
|
|
|
|
inode = afs_iget(dir->i_sb, key, &fid, &status, NULL);
|
|
if (IS_ERR(inode)) {
|
|
/* ENOMEM at a really inconvenient time - just abandon the new
|
|
* directory on the server */
|
|
ret = PTR_ERR(inode);
|
|
goto iget_error;
|
|
}
|
|
|
|
/* apply the status report we've got for the new vnode */
|
|
vnode = AFS_FS_I(inode);
|
|
spin_lock(&vnode->lock);
|
|
vnode->update_cnt++;
|
|
spin_unlock(&vnode->lock);
|
|
afs_vnode_finalise_status_update(vnode, server);
|
|
afs_put_server(server);
|
|
|
|
d_instantiate(dentry, inode);
|
|
if (d_unhashed(dentry)) {
|
|
_debug("not hashed");
|
|
d_rehash(dentry);
|
|
}
|
|
key_put(key);
|
|
_leave(" = 0");
|
|
return 0;
|
|
|
|
iget_error:
|
|
afs_put_server(server);
|
|
create_error:
|
|
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)
|
|
{
|
|
struct afs_vnode *orig_dvnode, *new_dvnode, *vnode;
|
|
struct key *key;
|
|
int ret;
|
|
|
|
vnode = AFS_FS_I(old_dentry->d_inode);
|
|
orig_dvnode = AFS_FS_I(old_dir);
|
|
new_dvnode = AFS_FS_I(new_dir);
|
|
|
|
_enter("{%x:%u},{%x:%u},{%x:%u},{%s}",
|
|
orig_dvnode->fid.vid, orig_dvnode->fid.vnode,
|
|
vnode->fid.vid, vnode->fid.vnode,
|
|
new_dvnode->fid.vid, new_dvnode->fid.vnode,
|
|
new_dentry->d_name.name);
|
|
|
|
ret = -ENAMETOOLONG;
|
|
if (new_dentry->d_name.len >= AFSNAMEMAX)
|
|
goto error;
|
|
|
|
key = afs_request_key(orig_dvnode->volume->cell);
|
|
if (IS_ERR(key)) {
|
|
ret = PTR_ERR(key);
|
|
goto error;
|
|
}
|
|
|
|
ret = afs_vnode_rename(orig_dvnode, new_dvnode, key,
|
|
old_dentry->d_name.name,
|
|
new_dentry->d_name.name);
|
|
if (ret < 0)
|
|
goto rename_error;
|
|
key_put(key);
|
|
_leave(" = 0");
|
|
return 0;
|
|
|
|
rename_error:
|
|
key_put(key);
|
|
error:
|
|
d_drop(new_dentry);
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|