static int
smb_dir_open(struct inode *dir, struct file *file)
{
struct dentry *dentry = file->f_path.dentry;
struct smb_sb_info *server;
int error = 0;
VERBOSE("(%s/%s)\n", dentry->d_parent->d_name.name,
file->f_path.dentry->d_name.name);
/*
* Directory timestamps in the core protocol aren't updated
* when a file is added, so we give them a very short TTL.
*/
lock_kernel();
server = server_from_dentry(dentry);
if (server->opt.protocol < SMB_PROTOCOL_LANMAN2) {
unsigned long age = jiffies - SMB_I(dir)->oldmtime;
if (age > 2*HZ)
smb_invalid_dir_cache(dir);
}
/*
* Note: in order to allow the smbmount process to open the
* mount point, we only revalidate if the connection is valid or
* if the process is trying to access something other than the root.
*/
if (server->state == CONN_VALID || !IS_ROOT(dentry))
error = smb_revalidate_inode(dentry);
unlock_kernel();
return error;
}
/*
* 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;
}
/*
* Note: in order to allow the smbclient process to open the
* mount point, we don't revalidate if conn_pid is NULL.
*/
static int
smb_dir_open(struct inode *dir, struct file *file)
{
struct dentry *dentry = file->f_dentry;
struct smb_sb_info *server = server_from_dentry(dentry);
int error = 0;
#ifdef SMBFS_DEBUG_VERBOSE
printk("smb_dir_open: (%s/%s)\n", dentry->d_parent->d_name.name,
file->f_dentry->d_name.name);
#endif
/*
* Directory timestamps in the core protocol aren't updated
* when a file is added, so we give them a very short TTL.
*/
if (server->opt.protocol < SMB_PROTOCOL_LANMAN2)
{
unsigned long age = jiffies - dir->u.smbfs_i.oldmtime;
if (age > 2*HZ)
smb_invalid_dir_cache(dir);
}
if (server->conn_pid)
error = smb_revalidate_inode(dentry);
return error;
}
/*
* 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;
}
/*
* Note: in order to allow the smbclient process to open the
* mount point, we don't revalidate if conn_pid is NULL.
*/
static int
smb_dir_open(struct inode *dir, struct file *file)
{
struct dentry *dentry = file->f_dentry;
struct smb_sb_info *server = server_from_dentry(dentry);
int error = 0;
VERBOSE("(%s/%s)\n", dentry->d_parent->d_name.name,
file->f_dentry->d_name.name);
if (server->conn_pid)
error = smb_revalidate_inode(dentry);
return error;
}
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 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;
}
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;
}
/*
* This is the callback when the dcache has a lookup hit.
*/
static int
smb_lookup_validate(struct 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 5 seconds. (But each
* successful server lookup renews the timestamp.)
*/
valid = (age <= SMBFS_MAX_AGE);
#ifdef SMBFS_DEBUG_VERBOSE
if (!valid)
printk("smb_lookup_validate: %s/%s not valid, age=%lu\n",
dentry->d_parent->d_name.name, dentry->d_name.name, age);
#endif
if (inode)
{
if (is_bad_inode(inode))
{
#ifdef SMBFS_PARANOIA
printk("smb_lookup_validate: %s/%s has dud inode\n",
dentry->d_parent->d_name.name, dentry->d_name.name);
#endif
valid = 0;
} else if (!valid)
valid = (smb_revalidate_inode(dentry) == 0);
} else
{
/*
* What should we do for negative dentries?
*/
}
return valid;
}
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;
}
/*
* 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;
}
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;
int result;
#ifdef SMBFS_DEBUG_VERBOSE
printk("smb_readdir: reading %s/%s, f_pos=%d\n",
dentry->d_parent->d_name.name, dentry->d_name.name, (int) filp->f_pos);
#endif
/*
* 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.
*/
if (!cachep->valid)
{
result = smb_refill_dircache(cachep, dentry);
if (result)
goto out_free;
}
result = 0;
switch ((unsigned int) filp->f_pos)
{
case 0:
if (filldir(dirent, ".", 1, 0, dir->i_ino) < 0)
goto out_free;
filp->f_pos = 1;
case 1:
if (filldir(dirent, "..", 2, 1,
dentry->d_parent->d_inode->i_ino) < 0)
goto out_free;
filp->f_pos = 2;
}
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_free:
smb_free_dircache(cachep);
out:
return result;
}
