static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
{
/*
* whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
* the cached file length
*/
if (whence != SEEK_SET && whence != SEEK_CUR) {
int rc;
struct inode *inode = file_inode(file);
/*
* We need to be sure that all dirty pages are written and the
* server has the newest file length.
*/
if (!CIFS_I(inode)->clientCanCacheRead && inode->i_mapping &&
inode->i_mapping->nrpages != 0) {
rc = filemap_fdatawait(inode->i_mapping);
if (rc) {
mapping_set_error(inode->i_mapping, rc);
return rc;
}
}
/*
* Some applications poll for the file length in this strange
* way so we must seek to end on non-oplocked files by
* setting the revalidate time to zero.
*/
CIFS_I(inode)->time = 0;
rc = cifs_revalidate_file_attr(file);
if (rc < 0)
return (loff_t)rc;
}
return generic_file_llseek(file, offset, whence);
}
int v9fs_file_open(struct inode *inode, struct file *file)
{
int err;
struct v9fs_inode *v9inode;
struct v9fs_session_info *v9ses;
struct p9_fid *fid;
int omode;
p9_debug(P9_DEBUG_VFS, "inode: %p file: %p\n", inode, file);
v9inode = V9FS_I(inode);
v9ses = v9fs_inode2v9ses(inode);
if (v9fs_proto_dotl(v9ses))
omode = v9fs_open_to_dotl_flags(file->f_flags);
else
omode = v9fs_uflags2omode(file->f_flags,
v9fs_proto_dotu(v9ses));
fid = file->private_data;
if (!fid) {
fid = v9fs_fid_clone(file->f_path.dentry);
if (IS_ERR(fid))
return PTR_ERR(fid);
err = p9_client_open(fid, omode);
if (err < 0) {
p9_client_clunk(fid);
return err;
}
if ((file->f_flags & O_APPEND) &&
(!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)))
generic_file_llseek(file, 0, SEEK_END);
}
file->private_data = fid;
mutex_lock(&v9inode->v_mutex);
if (v9ses->cache && !v9inode->writeback_fid &&
((file->f_flags & O_ACCMODE) != O_RDONLY)) {
/*
* clone a fid and add it to writeback_fid
* we do it during open time instead of
* page dirty time via write_begin/page_mkwrite
* because we want write after unlink usecase
* to work.
*/
fid = v9fs_writeback_fid(file->f_path.dentry);
if (IS_ERR(fid)) {
err = PTR_ERR(fid);
mutex_unlock(&v9inode->v_mutex);
goto out_error;
}
v9inode->writeback_fid = (void *) fid;
}
mutex_unlock(&v9inode->v_mutex);
if (v9ses->cache)
v9fs_cache_inode_set_cookie(inode, file);
return 0;
out_error:
p9_client_clunk(file->private_data);
file->private_data = NULL;
return err;
}
loff_t testfs_llseek(struct file *file, loff_t offset, int whence)
{
int ret = 0;
ret = generic_file_llseek(file, offset, whence);
printk(KERN_INFO "testfs: testfs_llseek called...\n");
return ret;
}
static loff_t sysfs_dir_llseek(struct file *file, loff_t offset, int whence)
{
struct inode *inode = file_inode(file);
loff_t ret;
mutex_lock(&inode->i_mutex);
ret = generic_file_llseek(file, offset, whence);
mutex_unlock(&inode->i_mutex);
return ret;
}
static loff_t kernfs_dir_fop_llseek(struct file *file, loff_t offset,
int whence)
{
struct inode *inode = file_inode(file);
loff_t ret;
inode_lock(inode);
ret = generic_file_llseek(file, offset, whence);
inode_unlock(inode);
return ret;
}
static loff_t gfs2_llseek(struct file *file, loff_t offset, int whence)
{
struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
struct gfs2_holder i_gh;
loff_t error;
switch (whence) {
case SEEK_END:
error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
&i_gh);
if (!error) {
error = generic_file_llseek(file, offset, whence);
gfs2_glock_dq_uninit(&i_gh);
}
break;
case SEEK_DATA:
error = gfs2_seek_data(file, offset);
break;
case SEEK_HOLE:
error = gfs2_seek_hole(file, offset);
break;
case SEEK_CUR:
case SEEK_SET:
/*
* These don't reference inode->i_size and don't depend on the
* block mapping, so we don't need the glock.
*/
error = generic_file_llseek(file, offset, whence);
break;
default:
error = -EINVAL;
}
return error;
}
/**
* ecryptfs_llseek
* @file: File we are seeking in
* @offset: The offset to seek to
* @origin: 2 - offset from i_size; 1 - offset from f_pos
*
* Returns the position we have seeked to, or negative on error
*/
static loff_t ecryptfs_llseek(struct file *file, loff_t offset, int origin)
{
loff_t rv;
loff_t new_end_pos;
int rc;
int expanding_file = 0;
struct inode *inode = file->f_mapping->host;
/* If our offset is past the end of our file, we're going to
* need to grow it so we have a valid length of 0's */
new_end_pos = offset;
switch (origin) {
case 2:
new_end_pos += i_size_read(inode);
expanding_file = 1;
break;
case 1:
new_end_pos += file->f_pos;
if (new_end_pos > i_size_read(inode)) {
ecryptfs_printk(KERN_DEBUG, "new_end_pos(=[0x%.16x]) "
"> i_size_read(inode)(=[0x%.16x])\n",
new_end_pos, i_size_read(inode));
expanding_file = 1;
}
break;
default:
if (new_end_pos > i_size_read(inode)) {
ecryptfs_printk(KERN_DEBUG, "new_end_pos(=[0x%.16x]) "
"> i_size_read(inode)(=[0x%.16x])\n",
new_end_pos, i_size_read(inode));
expanding_file = 1;
}
}
ecryptfs_printk(KERN_DEBUG, "new_end_pos = [0x%.16x]\n", new_end_pos);
if (expanding_file) {
rc = ecryptfs_truncate(file->f_path.dentry, new_end_pos);
if (rc) {
rv = rc;
ecryptfs_printk(KERN_ERR, "Error on attempt to "
"truncate to (higher) offset [0x%.16x];"
" rc = [%d]\n", new_end_pos, rc);
goto out;
}
}
rv = generic_file_llseek(file, offset, origin);
out:
return rv;
}
STATIC loff_t
xfs_file_llseek(
struct file *file,
loff_t offset,
int whence)
{
switch (whence) {
case SEEK_END:
case SEEK_CUR:
case SEEK_SET:
return generic_file_llseek(file, offset, whence);
case SEEK_HOLE:
case SEEK_DATA:
return xfs_seek_hole_data(file, offset, whence);
default:
return -EINVAL;
}
}
int v9fs_file_open(struct inode *inode, struct file *file)
{
int err;
struct v9fs_session_info *v9ses;
struct p9_fid *fid;
int omode;
P9_DPRINTK(P9_DEBUG_VFS, "inode: %p file: %p \n", inode, file);
v9ses = v9fs_inode2v9ses(inode);
omode = v9fs_uflags2omode(file->f_flags, v9fs_proto_dotu(v9ses));
fid = file->private_data;
if (!fid) {
fid = v9fs_fid_clone(file->f_path.dentry);
if (IS_ERR(fid))
return PTR_ERR(fid);
err = p9_client_open(fid, omode);
if (err < 0) {
p9_client_clunk(fid);
return err;
}
if (omode & P9_OTRUNC) {
i_size_write(inode, 0);
inode->i_blocks = 0;
}
if ((file->f_flags & O_APPEND) && (!v9fs_proto_dotu(v9ses)))
generic_file_llseek(file, 0, SEEK_END);
}
file->private_data = fid;
if ((fid->qid.version) && (v9ses->cache)) {
P9_DPRINTK(P9_DEBUG_VFS, "cached");
/* enable cached file options */
if(file->f_op == &v9fs_file_operations)
file->f_op = &v9fs_cached_file_operations;
#ifdef CONFIG_9P_FSCACHE
v9fs_cache_inode_set_cookie(inode, file);
#endif
}
return 0;
}
loff_t nfs_file_llseek(struct file *filp, loff_t offset, int whence)
{
dprintk("NFS: llseek file(%pD2, %lld, %d)\n",
filp, offset, whence);
/*
* whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
* the cached file length
*/
if (whence != SEEK_SET && whence != SEEK_CUR) {
struct inode *inode = filp->f_mapping->host;
int retval = nfs_revalidate_file_size(inode, filp);
if (retval < 0)
return (loff_t)retval;
}
return generic_file_llseek(filp, offset, whence);
}
loff_t nfs_file_llseek(struct file *filp, loff_t offset, int origin)
{
dprintk("NFS: llseek file(%s/%s, %lld, %d)\n",
filp->f_path.dentry->d_parent->d_name.name,
filp->f_path.dentry->d_name.name,
offset, origin);
/*
* origin == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
* the cached file length
*/
if (origin != SEEK_SET && origin != SEEK_CUR) {
struct inode *inode = filp->f_mapping->host;
int retval = nfs_revalidate_file_size(inode, filp);
if (retval < 0)
return (loff_t)retval;
}
return generic_file_llseek(filp, offset, origin);
}
static loff_t
zpl_llseek(struct file *filp, loff_t offset, int whence)
{
#if defined(SEEK_HOLE) && defined(SEEK_DATA)
if (whence == SEEK_DATA || whence == SEEK_HOLE) {
struct inode *ip = filp->f_mapping->host;
loff_t maxbytes = ip->i_sb->s_maxbytes;
loff_t error;
spl_inode_lock(ip);
error = -zfs_holey(ip, whence, &offset);
if (error == 0)
error = lseek_execute(filp, ip, offset, maxbytes);
spl_inode_unlock(ip);
return (error);
}
#endif /* SEEK_HOLE && SEEK_DATA */
return (generic_file_llseek(filp, offset, whence));
}
static loff_t unionfs_llseek(struct file *file, loff_t offset, int origin)
{
loff_t err;
struct file *hidden_file = NULL;
print_entry_location();
fist_dprint(6, "unionfs_llseek: file=%p, offset=0x%llx, origin=%d\n",
file, offset, origin);
if ((err = unionfs_file_revalidate(file, 0)))
goto out;
PASSERT(ftopd(file));
hidden_file = ftohf(file);
PASSERT(hidden_file);
/* always set hidden position to this one */
hidden_file->f_pos = file->f_pos;
memcpy(&(hidden_file->f_ra), &(file->f_ra),
sizeof(struct file_ra_state));
if (hidden_file->f_op && hidden_file->f_op->llseek)
err = hidden_file->f_op->llseek(hidden_file, offset, origin);
else
err = generic_file_llseek(hidden_file, offset, origin);
if (err < 0)
goto out;
if (err != file->f_pos) {
file->f_pos = err;
// ION maybe this?
// file->f_pos = hidden_file->f_pos;
file->f_version++;
}
out:
print_exit_status((int)err);
return err;
}
loff_t pmfs_llseek(struct file *file, loff_t offset, int origin)
{
struct inode *inode = file->f_path.dentry->d_inode;
int retval;
if (origin != SEEK_DATA && origin != SEEK_HOLE)
return generic_file_llseek(file, offset, origin);
mutex_lock(&inode->i_mutex);
switch (origin) {
case SEEK_DATA:
retval = pmfs_find_region(inode, &offset, 0);
if (retval) {
mutex_unlock(&inode->i_mutex);
return retval;
}
break;
case SEEK_HOLE:
retval = pmfs_find_region(inode, &offset, 1);
if (retval) {
mutex_unlock(&inode->i_mutex);
return retval;
}
break;
}
if ((offset < 0 && !(file->f_mode & FMODE_UNSIGNED_OFFSET)) ||
offset > inode->i_sb->s_maxbytes) {
mutex_unlock(&inode->i_mutex);
return -EINVAL;
}
if (offset != file->f_pos) {
file->f_pos = offset;
file->f_version = 0;
}
mutex_unlock(&inode->i_mutex);
return offset;
}
/* If a directory is seeked, we have to free saved readdir() state */
static loff_t ubifs_dir_llseek(struct file *file, loff_t offset, int origin)
{
kfree(file->private_data);
file->private_data = NULL;
return generic_file_llseek(file, offset, origin);
}
static loff_t ubifs_dir_llseek(struct file *file, loff_t offset, int whence)
{
return generic_file_llseek(file, offset, whence);
}
static loff_t ubifs_dir_llseek(struct file *file, loff_t offset, int origin)
{
return generic_file_llseek(file, offset, origin);
}
/**
* @brief generic llseek implementation for regular files This is a generic implemenation
* of ->llseek useable for all normal local filesystems. It just updates the file
* offset to the value specified by
* @offset and @origin under i_mutex.
* @param pfile file structure to seek on
* @param offset file offset to seek to
* @param origin type of seek
*
* @returns file postion after seek
*
*/
loff_t yramfs_file_llseek(struct file *pfile, loff_t offset, int origin)
{
DBG_PRINT("seek");
return generic_file_llseek(pfile, offset, origin);
}
loff_t
dfs_file_lseek(struct file *filp, loff_t pos, int origin)
{
return generic_file_llseek(filp, pos, origin);
}
loff_t sjfs_fops_llseek(struct file *f, loff_t l, int i) {
printk("sjfs_fops_llseek -> generic_file_llseek\n");
return generic_file_llseek(f, l, i);
}
