/*
* Write to a file (through the page cache).
*/
static ssize_t
smb_file_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
{
struct dentry * dentry = file->f_dentry;
ssize_t result;
VERBOSE("file %s/%s, count=%lu@%lu\n",
DENTRY_PATH(dentry),
(unsigned long) count, (unsigned long) *ppos);
result = smb_revalidate_inode(dentry);
if (result) {
PARANOIA("%s/%s validation failed, error=%Zd\n",
DENTRY_PATH(dentry), result);
goto out;
}
result = smb_open(dentry, SMB_O_WRONLY);
if (result)
goto out;
if (count > 0) {
result = generic_file_write(file, buf, count, ppos);
VERBOSE("pos=%ld, size=%ld, mtime=%ld, atime=%ld\n",
(long) file->f_pos, (long) dentry->d_inode->i_size,
dentry->d_inode->i_mtime, dentry->d_inode->i_atime);
}
out:
return result;
}
static ssize_t
smb_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos)
{
struct file * file = iocb->ki_filp;
struct dentry * dentry = file->f_path.dentry;
ssize_t status;
VERBOSE("file %s/%s, count=%lu@%lu\n", DENTRY_PATH(dentry),
(unsigned long) iocb->ki_left, (unsigned long) pos);
status = smb_revalidate_inode(dentry);
if (status) {
PARANOIA("%s/%s validation failed, error=%Zd\n",
DENTRY_PATH(dentry), status);
goto out;
}
VERBOSE("before read, size=%ld, flags=%x, atime=%ld\n",
(long)dentry->d_inode->i_size,
dentry->d_inode->i_flags, dentry->d_inode->i_atime.tv_sec);
status = generic_file_aio_read(iocb, iov, nr_segs, pos);
out:
return status;
}
/*
* This is the callback when the dcache has a lookup hit.
*/
static int
smb_lookup_validate(struct dentry * dentry, struct nameidata *nd)
{
struct smb_sb_info *server = server_from_dentry(dentry);
struct inode * inode = dentry->d_inode;
unsigned long age = jiffies - dentry->d_time;
int valid;
/*
* The default validation is based on dentry age:
* we believe in dentries for a few seconds. (But each
* successful server lookup renews the timestamp.)
*/
valid = (age <= SMB_MAX_AGE(server));
#ifdef SMBFS_DEBUG_VERBOSE
if (!valid)
VERBOSE("%s/%s not valid, age=%lu\n",
DENTRY_PATH(dentry), age);
#endif
if (inode) {
lock_kernel();
if (is_bad_inode(inode)) {
PARANOIA("%s/%s has dud inode\n", DENTRY_PATH(dentry));
valid = 0;
} else if (!valid)
valid = (smb_revalidate_inode(dentry) == 0);
unlock_kernel();
} else {
/*
* What should we do for negative dentries?
*/
}
return valid;
}
/*
* Write to a file (through the page cache).
*/
static ssize_t
smb_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos)
{
struct file * file = iocb->ki_filp;
struct dentry * dentry = file->f_path.dentry;
ssize_t result;
VERBOSE("file %s/%s, count=%lu@%lu\n",
DENTRY_PATH(dentry),
(unsigned long) iocb->ki_left, (unsigned long) pos);
result = smb_revalidate_inode(dentry);
if (result) {
PARANOIA("%s/%s validation failed, error=%Zd\n",
DENTRY_PATH(dentry), result);
goto out;
}
result = smb_open(dentry, SMB_O_WRONLY);
if (result)
goto out;
if (iocb->ki_left > 0) {
result = generic_file_aio_write(iocb, iov, nr_segs, pos);
VERBOSE("pos=%ld, size=%ld, mtime=%ld, atime=%ld\n",
(long) file->f_pos, (long) dentry->d_inode->i_size,
dentry->d_inode->i_mtime, dentry->d_inode->i_atime);
}
out:
return result;
}
int smb_follow_link(struct dentry *dentry, struct nameidata *nd)
{
char *link;
int result;
DEBUG1("followlink of %s/%s\n", DENTRY_PATH(dentry));
result = -ENOMEM;
link = kmalloc(SMB_MAXNAMELEN + 1, GFP_KERNEL);
if (!link)
goto out;
result = smb_proc_read_link(server_from_dentry(dentry), dentry, link,
SMB_MAXNAMELEN);
if (result < 0 || result >= SMB_MAXNAMELEN)
goto out_free;
link[result] = 0;
result = vfs_follow_link(nd, link);
out_free:
kfree(link);
out:
return result;
}
int smb_symlink(struct inode *dir, struct dentry *dentry, const char *oldname)
{
DEBUG1("create symlink %s -> %s/%s\n", oldname, DENTRY_PATH(dentry));
smb_invalid_dir_cache(dir);
return smb_proc_symlink(server_from_dentry(dentry), dentry, oldname);
}
/*
* Read a page synchronously.
*/
static int
smb_readpage_sync(struct dentry *dentry, struct page *page)
{
char *buffer = kmap(page);
loff_t offset = (loff_t)page->index << PAGE_CACHE_SHIFT;
struct smb_sb_info *server = server_from_dentry(dentry);
unsigned int rsize = smb_get_rsize(server);
int count = PAGE_SIZE;
int result;
VERBOSE("file %s/%s, count=%d@%ld, rsize=%d\n",
DENTRY_PATH(dentry), count, offset, rsize);
result = smb_open(dentry, SMB_O_RDONLY);
if (result < 0) {
PARANOIA("%s/%s open failed, error=%d\n",
DENTRY_PATH(dentry), result);
goto io_error;
}
do {
if (count < rsize)
rsize = count;
result = server->ops->read(dentry->d_inode,offset,rsize,buffer);
if (result < 0)
goto io_error;
count -= result;
offset += result;
buffer += result;
dentry->d_inode->i_atime = CURRENT_TIME;
if (result < rsize)
break;
} while (count);
memset(buffer, 0, count);
flush_dcache_page(page);
SetPageUptodate(page);
result = 0;
io_error:
kunmap(page);
UnlockPage(page);
return result;
}
static int
smb_file_mmap(struct file * file, struct vm_area_struct * vma)
{
struct dentry * dentry = file->f_dentry;
int status;
VERBOSE("file %s/%s, address %lu - %lu\n",
DENTRY_PATH(dentry), vma->vm_start, vma->vm_end);
status = smb_revalidate_inode(dentry);
if (status) {
PARANOIA("%s/%s validation failed, error=%d\n",
DENTRY_PATH(dentry), status);
goto out;
}
status = generic_file_mmap(file, vma);
out:
return status;
}
static int
smb_updatepage(struct file *file, struct page *page, unsigned long offset,
unsigned int count)
{
struct dentry *dentry = file->f_dentry;
DEBUG1("(%s/%s %d@%ld)\n", DENTRY_PATH(dentry),
count, (page->index << PAGE_CACHE_SHIFT)+offset);
return smb_writepage_sync(dentry->d_inode, page, offset, count);
}
static ssize_t
smb_file_sendfile(struct file *file, loff_t *ppos,
size_t count, read_actor_t actor, void *target)
{
struct dentry *dentry = file->f_path.dentry;
ssize_t status;
VERBOSE("file %s/%s, pos=%Ld, count=%d\n",
DENTRY_PATH(dentry), *ppos, count);
status = smb_revalidate_inode(dentry);
if (status) {
PARANOIA("%s/%s validation failed, error=%Zd\n",
DENTRY_PATH(dentry), status);
goto out;
}
status = generic_file_sendfile(file, ppos, count, actor, target);
out:
return status;
}
int
smb_refill_dircache(struct cache_head * cachep, struct dentry *dentry)
{
struct inode * inode = dentry->d_inode;
int result;
VERBOSE("cache %s/%s, blocks=%d\n", DENTRY_PATH(dentry), cachep->pages);
/*
* Fill the cache, starting at position 2.
*/
retry:
inode->u.smbfs_i.cache_valid |= SMB_F_CACHEVALID;
result = smb_proc_readdir(dentry, 2, cachep);
if (result < 0)
{
PARANOIA("readdir failed, result=%d\n", result);
goto out;
}
/*
* Check whether the cache was invalidated while
* we were doing the scan ...
*/
if (!(inode->u.smbfs_i.cache_valid & SMB_F_CACHEVALID))
{
PARANOIA("cache invalidated, retrying\n");
goto retry;
}
result = cachep->status;
if (!result)
{
cachep->valid = 1;
cachep->mtime = dentry->d_inode->i_mtime;
}
VERBOSE("cache %s/%s status=%d, entries=%d\n",
DENTRY_PATH(dentry), cachep->status, cachep->entries);
out:
return result;
}
static ssize_t
smb_file_splice_read(struct file *file, loff_t *ppos,
struct pipe_inode_info *pipe, size_t count,
unsigned int flags)
{
struct dentry *dentry = file->f_path.dentry;
ssize_t status;
VERBOSE("file %s/%s, pos=%Ld, count=%lu\n",
DENTRY_PATH(dentry), *ppos, count);
status = smb_revalidate_inode(dentry);
if (status) {
PARANOIA("%s/%s validation failed, error=%Zd\n",
DENTRY_PATH(dentry), status);
goto out;
}
status = generic_file_splice_read(file, ppos, pipe, count, flags);
out:
return status;
}
/*
* Get a pointer to the cache_head structure,
* mapped as the page at offset 0. The page is
* kept locked while we're using the cache.
*/
struct cache_head *
smb_get_dircache(struct dentry * dentry)
{
struct inode * inode = dentry->d_inode;
struct cache_head * cachep;
VERBOSE("finding cache for %s/%s\n", DENTRY_PATH(dentry));
cachep = (struct cache_head *) get_cached_page(inode, 0, 1);
if (!cachep)
goto out;
if (cachep->valid)
{
struct cache_index * index = cachep->index;
struct cache_block * block;
unsigned long offset;
int i;
cachep->valid = 0;
/*
* Here we only want to find existing cache blocks,
* not add new ones.
*/
for (i = 0; i < cachep->pages; i++, index++) {
#ifdef SMBFS_PARANOIA
if (index->block)
PARANOIA("cache %s/%s has existing block!\n",
DENTRY_PATH(dentry));
#endif
offset = PAGE_SIZE + (i << PAGE_SHIFT);
block = (struct cache_block *) get_cached_page(inode,
offset, 0);
if (!block)
goto out;
index->block = block;
}
cachep->valid = 1;
}
out:
return cachep;
}
/*
* This is called to update the inode attributes after
* we've made changes to a file or directory.
*/
static int
smb_refresh_inode(struct dentry *dentry)
{
struct inode *inode = dentry->d_inode;
int error;
struct smb_fattr fattr;
error = smb_proc_getattr(dentry, &fattr);
if (!error) {
smb_renew_times(dentry);
/*
* Check whether the type part of the mode changed,
* and don't update the attributes if it did.
*
* And don't dick with the root inode
*/
if (inode->i_ino == 2)
return error;
if (S_ISLNK(inode->i_mode))
return error; /* VFS will deal with it */
if ((inode->i_mode & S_IFMT) == (fattr.f_mode & S_IFMT)) {
smb_set_inode_attr(inode, &fattr);
} else {
/*
* Big trouble! The inode has become a new object,
* so any operations attempted on it are invalid.
*
* To limit damage, mark the inode as bad so that
* subsequent lookup validations will fail.
*/
PARANOIA("%s/%s changed mode, %07o to %07o\n",
DENTRY_PATH(dentry),
inode->i_mode, fattr.f_mode);
fattr.f_mode = inode->i_mode; /* save mode */
make_bad_inode(inode);
inode->i_mode = fattr.f_mode; /* restore mode */
/*
* No need to worry about unhashing the dentry: the
* lookup validation will see that the inode is bad.
* But we do want to invalidate the caches ...
*/
if (!S_ISDIR(inode->i_mode))
invalidate_remote_inode(inode);
else
smb_invalid_dir_cache(inode);
error = -EIO;
}
}
return error;
}
static ssize_t
smb_file_read(struct file * file, char * buf, size_t count, loff_t *ppos)
{
struct dentry * dentry = file->f_dentry;
ssize_t status;
VERBOSE("file %s/%s, count=%lu@%lu\n", DENTRY_PATH(dentry),
(unsigned long) count, (unsigned long) *ppos);
status = smb_revalidate_inode(dentry);
if (status) {
PARANOIA("%s/%s validation failed, error=%Zd\n",
DENTRY_PATH(dentry), status);
goto out;
}
VERBOSE("before read, size=%ld, flags=%x, atime=%ld\n",
(long)dentry->d_inode->i_size,
dentry->d_inode->i_flags, dentry->d_inode->i_atime);
status = generic_file_read(file, buf, count, ppos);
out:
return status;
}
static int
smb_fsync(struct file *file, struct dentry * dentry, int datasync)
{
struct smb_sb_info *server = server_from_dentry(dentry);
int result;
VERBOSE("sync file %s/%s\n", DENTRY_PATH(dentry));
/*
* The VFS will writepage() all dirty pages for us, but we
* should send a SMBflush to the server, letting it know that
* we want things synchronized with actual storage.
*
* Note: this function requires all pages to have been written already
* (should be ok with writepage_sync)
*/
result = smb_proc_flush(server, SMB_I(dentry->d_inode)->fileid);
return result;
}
static int smb_follow_link(struct dentry *dentry, struct nameidata *nd)
{
char *link = __getname();
DEBUG1("followlink of %s/%s\n", DENTRY_PATH(dentry));
if (!link) {
link = ERR_PTR(-ENOMEM);
} else {
int len = smb_proc_read_link(server_from_dentry(dentry),
dentry, link, PATH_MAX - 1);
if (len < 0) {
__putname(link);
link = ERR_PTR(len);
} else {
link[len] = 0;
}
}
nd_set_link(nd, link);
return 0;
}
/*
* Read a directory, using filldir to fill the dirent memory.
* smb_proc_readdir does the actual reading from the smb server.
*
* The cache code is almost directly taken from ncpfs
*/
static int
smb_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
struct dentry *dentry = filp->f_path.dentry;
struct inode *dir = dentry->d_inode;
struct smb_sb_info *server = server_from_dentry(dentry);
union smb_dir_cache *cache = NULL;
struct smb_cache_control ctl;
struct page *page = NULL;
int result;
ctl.page = NULL;
ctl.cache = NULL;
VERBOSE("reading %s/%s, f_pos=%d\n",
DENTRY_PATH(dentry), (int) filp->f_pos);
result = 0;
lock_kernel();
switch ((unsigned int) filp->f_pos) {
case 0:
if (filldir(dirent, ".", 1, 0, dir->i_ino, DT_DIR) < 0)
goto out;
filp->f_pos = 1;
/* fallthrough */
case 1:
if (filldir(dirent, "..", 2, 1, parent_ino(dentry), DT_DIR) < 0)
goto out;
filp->f_pos = 2;
}
/*
* Make sure our inode is up-to-date.
*/
result = smb_revalidate_inode(dentry);
if (result)
goto out;
page = grab_cache_page(&dir->i_data, 0);
if (!page)
goto read_really;
ctl.cache = cache = kmap(page);
ctl.head = cache->head;
if (!PageUptodate(page) || !ctl.head.eof) {
VERBOSE("%s/%s, page uptodate=%d, eof=%d\n",
DENTRY_PATH(dentry), PageUptodate(page),ctl.head.eof);
goto init_cache;
}
if (filp->f_pos == 2) {
if (jiffies - ctl.head.time >= SMB_MAX_AGE(server))
goto init_cache;
/*
* N.B. ncpfs checks mtime of dentry too here, we don't.
* 1. common smb servers do not update mtime on dir changes
* 2. it requires an extra smb request
* (revalidate has the same timeout as ctl.head.time)
*
* Instead smbfs invalidates its own cache on local changes
* and remote changes are not seen until timeout.
*/
}
if (filp->f_pos > ctl.head.end)
goto finished;
ctl.fpos = filp->f_pos + (SMB_DIRCACHE_START - 2);
ctl.ofs = ctl.fpos / SMB_DIRCACHE_SIZE;
ctl.idx = ctl.fpos % SMB_DIRCACHE_SIZE;
for (;;) {
if (ctl.ofs != 0) {
ctl.page = find_lock_page(&dir->i_data, ctl.ofs);
if (!ctl.page)
goto invalid_cache;
ctl.cache = kmap(ctl.page);
if (!PageUptodate(ctl.page))
goto invalid_cache;
}
while (ctl.idx < SMB_DIRCACHE_SIZE) {
struct dentry *dent;
int res;
dent = smb_dget_fpos(ctl.cache->dentry[ctl.idx],
dentry, filp->f_pos);
if (!dent)
goto invalid_cache;
res = filldir(dirent, dent->d_name.name,
dent->d_name.len, filp->f_pos,
dent->d_inode->i_ino, DT_UNKNOWN);
dput(dent);
if (res)
goto finished;
filp->f_pos += 1;
ctl.idx += 1;
if (filp->f_pos > ctl.head.end)
goto finished;
}
if (ctl.page) {
kunmap(ctl.page);
SetPageUptodate(ctl.page);
unlock_page(ctl.page);
page_cache_release(ctl.page);
ctl.page = NULL;
}
ctl.idx = 0;
ctl.ofs += 1;
}
invalid_cache:
if (ctl.page) {
kunmap(ctl.page);
unlock_page(ctl.page);
page_cache_release(ctl.page);
ctl.page = NULL;
}
ctl.cache = cache;
init_cache:
smb_invalidate_dircache_entries(dentry);
ctl.head.time = jiffies;
ctl.head.eof = 0;
ctl.fpos = 2;
ctl.ofs = 0;
ctl.idx = SMB_DIRCACHE_START;
ctl.filled = 0;
ctl.valid = 1;
read_really:
result = server->ops->readdir(filp, dirent, filldir, &ctl);
if (result == -ERESTARTSYS && page)
ClearPageUptodate(page);
if (ctl.idx == -1)
goto invalid_cache; /* retry */
ctl.head.end = ctl.fpos - 1;
ctl.head.eof = ctl.valid;
finished:
if (page) {
cache->head = ctl.head;
kunmap(page);
if (result != -ERESTARTSYS)
SetPageUptodate(page);
unlock_page(page);
page_cache_release(page);
}
if (ctl.page) {
kunmap(ctl.page);
SetPageUptodate(ctl.page);
unlock_page(ctl.page);
page_cache_release(ctl.page);
}
out:
unlock_kernel();
return result;
}
static int
smb_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
struct dentry *dentry = filp->f_dentry;
struct inode *dir = dentry->d_inode;
struct cache_head *cachep = NULL;
int result;
VERBOSE("reading %s/%s, f_pos=%d\n", DENTRY_PATH(dentry),
(int) filp->f_pos);
result = 0;
switch ((unsigned int) filp->f_pos)
{
case 0:
if (filldir(dirent, ".", 1, 0, dir->i_ino) < 0)
goto out;
filp->f_pos = 1;
case 1:
if (filldir(dirent, "..", 2, 1,
dentry->d_parent->d_inode->i_ino) < 0)
goto out;
filp->f_pos = 2;
}
/*
* Make sure our inode is up-to-date.
*/
result = smb_revalidate_inode(dentry);
if (result)
goto out;
/*
* Get the cache pointer ...
*/
result = -EIO;
cachep = smb_get_dircache(dentry);
if (!cachep)
goto out;
/*
* Make sure the cache is up-to-date.
*
* To detect changes on the server we refill on each "new" access.
*
* Directory mtime would be nice to use for finding changes,
* unfortunately some servers (NT4) doesn't update on local changes.
*/
if (!cachep->valid || filp->f_pos == 2)
{
result = smb_refill_dircache(cachep, dentry);
if (result)
goto out;
}
result = 0;
while (1)
{
struct cache_dirent this_dirent, *entry = &this_dirent;
if (!smb_find_in_cache(cachep, filp->f_pos, entry))
break;
/*
* Check whether to look up the inode number.
*/
if (!entry->ino) {
struct qstr qname;
/* N.B. Make cache_dirent name a qstr! */
qname.name = entry->name;
qname.len = entry->len;
entry->ino = find_inode_number(dentry, &qname);
if (!entry->ino)
entry->ino = smb_invent_inos(1);
}
if (filldir(dirent, entry->name, entry->len,
filp->f_pos, entry->ino) < 0)
break;
filp->f_pos += 1;
}
/*
* Release the dircache.
*/
out:
if (cachep) {
smb_free_dircache(cachep);
}
return result;
}
