static int __snd_open(struct inode *inode, struct file *file)
{
unsigned int minor = iminor(inode);
struct snd_minor *mptr = NULL;
const struct file_operations *old_fops;
int err = 0;
if (minor >= ARRAY_SIZE(snd_minors))
return -ENODEV;
mptr = snd_minors[minor];
if (mptr == NULL) {
#ifdef CONFIG_MODULES
int dev = SNDRV_MINOR_DEVICE(minor);
if (dev == SNDRV_MINOR_CONTROL) {
/* /dev/aloadC? */
int card = SNDRV_MINOR_CARD(minor);
if (snd_cards[card] == NULL)
snd_request_card(card);
} else if (dev == SNDRV_MINOR_GLOBAL) {
/* /dev/aloadSEQ */
snd_request_other(minor);
}
#ifndef CONFIG_SND_DYNAMIC_MINORS
/* /dev/snd/{controlC?,seq} */
mptr = snd_minors[minor];
if (mptr == NULL)
#endif
#endif
return -ENODEV;
}
old_fops = file->f_op;
file->f_op = fops_get(mptr->f_ops);
if (file->f_op == NULL) {
file->f_op = old_fops;
return -ENODEV;
}
if (file->f_op->open)
err = file->f_op->open(inode, file);
if (err) {
fops_put(file->f_op);
file->f_op = fops_get(old_fops);
}
fops_put(old_fops);
return err;
}
struct file *dentry_open(struct dentry *dentry, struct vfsmount *mnt, int flags) {
struct file *f = // get an empty file structure
f->f_flags = flags;
// call open() used inode
struct inode = dentry->d_inode;
f->f_op = fops_get(inode->i_fop);
f->f_op = open(inode, f);
}
static int phone_open(struct inode *inode, struct file *file)
{
unsigned int minor = MINOR(inode->i_rdev);
int err = 0;
struct phone_device *p;
struct file_operations *old_fops, *new_fops = NULL;
if (minor >= PHONE_NUM_DEVICES)
return -ENODEV;
down(&phone_lock);
p = phone_device[minor];
if (p)
new_fops = fops_get(p->f_op);
if (!new_fops) {
char modname[32];
up(&phone_lock);
sprintf(modname, "char-major-%d-%d", PHONE_MAJOR, minor);
request_module(modname);
down(&phone_lock);
p = phone_device[minor];
if (p == NULL || (new_fops = fops_get(p->f_op)) == NULL)
{
err=-ENODEV;
goto end;
}
}
old_fops = file->f_op;
file->f_op = new_fops;
if (p->open)
err = p->open(p, file); /* Tell the device it is open */
if (err) {
fops_put(file->f_op);
file->f_op = fops_get(old_fops);
}
fops_put(old_fops);
end:
up(&phone_lock);
return err;
}
static int phone_open(struct inode *inode, struct file *file)
{
unsigned int minor = iminor(inode);
int err = 0;
struct phone_device *p;
const struct file_operations *old_fops, *new_fops = NULL;
if (minor >= PHONE_NUM_DEVICES)
return -ENODEV;
lock_kernel();
mutex_lock(&phone_lock);
p = phone_device[minor];
if (p)
new_fops = fops_get(p->f_op);
if (!new_fops) {
mutex_unlock(&phone_lock);
request_module("char-major-%d-%d", PHONE_MAJOR, minor);
mutex_lock(&phone_lock);
p = phone_device[minor];
if (p == NULL || (new_fops = fops_get(p->f_op)) == NULL)
{
err=-ENODEV;
goto end;
}
}
old_fops = file->f_op;
file->f_op = new_fops;
if (p->open)
err = p->open(p, file); /* Tell the device it is open */
if (err) {
fops_put(file->f_op);
file->f_op = fops_get(old_fops);
}
fops_put(old_fops);
end:
mutex_unlock(&phone_lock);
unlock_kernel();
return err;
}
static int snd_open(struct inode *inode, struct file *file)
{
unsigned int minor = iminor(inode);
struct snd_minor *mptr = NULL;
const struct file_operations *old_fops;
int err = 0;
if (minor >= ARRAY_SIZE(snd_minors))
return -ENODEV;
mutex_lock(&sound_mutex);
mptr = snd_minors[minor];
if (mptr == NULL) {
mptr = autoload_device(minor);
if (!mptr) {
mutex_unlock(&sound_mutex);
return -ENODEV;
}
}
old_fops = file->f_op;
file->f_op = fops_get(mptr->f_ops);
if (file->f_op == NULL) {
file->f_op = old_fops;
err = -ENODEV;
}
mutex_unlock(&sound_mutex);
if (err < 0)
return err;
if (file->f_op->open) {
err = file->f_op->open(inode, file);
if (err) {
fops_put(file->f_op);
file->f_op = fops_get(old_fops);
}
}
fops_put(old_fops);
return err;
}
static int dvb_device_open(struct inode *inode, struct file *file)
{
struct dvb_device *dvbdev;
mutex_lock(&dvbdev_mutex);
down_read(&minor_rwsem);
dvbdev = dvb_minors[iminor(inode)];
if (dvbdev && dvbdev->fops) {
int err = 0;
const struct file_operations *old_fops;
file->private_data = dvbdev;
old_fops = file->f_op;
file->f_op = fops_get(dvbdev->fops);
if (file->f_op == NULL) {
file->f_op = old_fops;
goto fail;
}
if(file->f_op->open) {
mutex_unlock(&dvbdev_mutex);
err = file->f_op->open(inode,file);
mutex_lock(&dvbdev_mutex);
}
if (err) {
fops_put(file->f_op);
file->f_op = fops_get(old_fops);
}
fops_put(old_fops);
up_read(&minor_rwsem);
mutex_unlock(&dvbdev_mutex);
return err;
}
fail:
up_read(&minor_rwsem);
mutex_unlock(&dvbdev_mutex);
return -ENODEV;
}
void *
osi_UFSOpen(afs_int32 ainode)
{
register struct osi_file *afile = NULL;
extern int cacheDiskType;
afs_int32 code = 0;
struct inode *tip = NULL;
struct file *filp = NULL;
AFS_STATCNT(osi_UFSOpen);
if (cacheDiskType != AFS_FCACHE_TYPE_UFS) {
osi_Panic("UFSOpen called for non-UFS cache\n");
}
if (!afs_osicred_initialized) {
/* valid for alpha_osf, SunOS, Ultrix */
memset((char *)&afs_osi_cred, 0, sizeof(struct AFS_UCRED));
crhold(&afs_osi_cred); /* don't let it evaporate, since it is static */
afs_osicred_initialized = 1;
}
afile = (struct osi_file *)osi_AllocLargeSpace(sizeof(struct osi_file));
AFS_GUNLOCK();
if (!afile) {
osi_Panic("osi_UFSOpen: Failed to allocate %d bytes for osi_file.\n",
sizeof(struct osi_file));
}
memset(afile, 0, sizeof(struct osi_file));
filp = &afile->file;
filp->f_dentry = &afile->dentry;
tip = iget(afs_cacheSBp, (u_long) ainode);
if (!tip)
osi_Panic("Can't get inode %d\n", ainode);
FILE_INODE(filp) = tip;
tip->i_flags |= MS_NOATIME; /* Disable updating access times. */
filp->f_flags = O_RDWR;
#if defined(AFS_LINUX24_ENV)
filp->f_mode = FMODE_READ|FMODE_WRITE;
filp->f_op = fops_get(tip->i_fop);
#else
filp->f_op = tip->i_op->default_file_ops;
#endif
if (filp->f_op && filp->f_op->open)
code = filp->f_op->open(tip, filp);
if (code)
osi_Panic("Can't open inode %d\n", ainode);
afile->size = i_size_read(tip);
AFS_GLOCK();
afile->offset = 0;
afile->proc = (int (*)())0;
afile->inum = ainode; /* for hint validity checking */
return (void *)afile;
}
static int soundcore_open(struct inode *inode, struct file *file)
{
int chain;
int unit = iminor(inode);
struct sound_unit *s;
const struct file_operations *new_fops = NULL;
lock_kernel ();
chain=unit&0x0F;
if(chain==4 || chain==5) /* dsp/audio/dsp16 */
{
unit&=0xF0;
unit|=3;
chain=3;
}
spin_lock(&sound_loader_lock);
s = __look_for_unit(chain, unit);
if (s)
new_fops = fops_get(s->unit_fops);
if (!new_fops) {
spin_unlock(&sound_loader_lock);
/*
* Please, don't change this order or code.
* For ALSA slot means soundcard and OSS emulation code
* comes as add-on modules which aren't depend on
* ALSA toplevel modules for soundcards, thus we need
* load them at first. [Jaroslav Kysela <*****@*****.**>]
*/
request_module("sound-slot-%i", unit>>4);
request_module("sound-service-%i-%i", unit>>4, chain);
spin_lock(&sound_loader_lock);
s = __look_for_unit(chain, unit);
if (s)
new_fops = fops_get(s->unit_fops);
}
struct file *dentry_open(struct dentry *dentry, struct vfsmount *mnt, int flags)
{
struct file * f;
struct inode *inode;
int error;
error = -ENFILE;
f = get_empty_filp();
if (!f)
goto cleanup_dentry;
f->f_flags = flags;
f->f_mode = (flags+1) & O_ACCMODE;
inode = dentry->d_inode;
if (f->f_mode & FMODE_WRITE) {
error = get_write_access(inode);
if (error)
goto cleanup_file;
}
f->f_dentry = dentry;
f->f_vfsmnt = mnt;
f->f_pos = 0;
f->f_reada = 0;
f->f_op = fops_get(inode->i_fop);
if (inode->i_sb)
file_move(f, &inode->i_sb->s_files);
if (f->f_op && f->f_op->open) {
error = f->f_op->open(inode,f);
if (error)
goto cleanup_all;
}
f->f_flags &= ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);
return f;
cleanup_all:
fops_put(f->f_op);
if (f->f_mode & FMODE_WRITE)
put_write_access(inode);
f->f_dentry = NULL;
f->f_vfsmnt = NULL;
cleanup_file:
put_filp(f);
cleanup_dentry:
dput(dentry);
mntput(mnt);
return ERR_PTR(error);
}
static struct file *vperfctr_get_filp(void)
{
struct file *filp;
struct inode *inode;
struct dentry *dentry;
inode = vperfctr_get_inode();
if (!inode)
goto out;
dentry = vperfctr_d_alloc_root(inode);
if (!dentry)
goto out_inode;
/*
* Create the filp _after_ the inode and dentry, to avoid
* needing access to put_filp(), which is no longer exported
* starting with kernel 2.6.10-rc1. fput() is available but
* doesn't work on incomplete files. We now need access to
* dput() instead, but that's Ok.
*/
filp = get_empty_filp();
if (!filp)
goto out_dentry;
filp_vfsmnt(filp) = mntget(vperfctr_mnt);
filp_dentry(filp) = dentry;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,2)
filp->f_mapping = dentry->d_inode->i_mapping;
#endif
filp->f_pos = 0;
filp->f_flags = 0;
filp->f_op = fops_get(&vperfctr_file_ops); /* fops_get() for MODULE */
filp->f_mode = FMODE_READ;
filp->f_version = 0;
return filp;
out_dentry:
dput(dentry);
goto out; /* dput() also does iput() */
out_inode:
iput(inode);
out:
return NULL;
}
/*
* fifo_open: - open a fifo device node
* @inode: the external filesystem inode
* @file: the external filesystem file pointer
*
* fifo_open() is only used to open a fifo device (named pipe) from a character device node in an
* external filesystem. This is never called for direct opens of a specfs device node (for direct
* opens, see spec_dev_open() in strspecfs.c). The character device inode is opened directly and
* no inode in the shadow filesystem is addressed.
*/
STATIC int
fifo_open(struct inode *inode, struct file *file)
{
int err;
dev_t dev = makedevice(fifo_cdev.d_modid, 0);
{
struct file_operations *f_op;
err = -ENXIO;
if (!(f_op = fops_get(fifo_cdev.d_fop))) {
goto error;
}
fops_put(file->f_op);
file->f_op = f_op;
}
file->private_data = &dev; /* use this device number instead of inode number */
file->f_flags &= ~O_CLONE; /* FIFOs never clone */
err = file->f_op->open(inode, file);
error:
return (err);
}
static int do_dentry_open(struct file *f,
int (*open)(struct inode *, struct file *),
const struct cred *cred)
{
static const struct file_operations empty_fops = {};
struct inode *inode;
int error;
f->f_mode = OPEN_FMODE(f->f_flags) | FMODE_LSEEK |
FMODE_PREAD | FMODE_PWRITE;
if (unlikely(f->f_flags & O_PATH))
f->f_mode = FMODE_PATH;
path_get(&f->f_path);
inode = f->f_inode = f->f_path.dentry->d_inode;
if (f->f_mode & FMODE_WRITE) {
error = __get_file_write_access(inode, f->f_path.mnt);
if (error)
goto cleanup_file;
if (!special_file(inode->i_mode))
file_take_write(f);
}
f->f_mapping = inode->i_mapping;
file_sb_list_add(f, inode->i_sb);
if (unlikely(f->f_mode & FMODE_PATH)) {
f->f_op = &empty_fops;
return 0;
}
f->f_op = fops_get(inode->i_fop);
error = security_file_open(f, cred);
if (error)
goto cleanup_all;
error = break_lease(inode, f->f_flags);
if (error)
goto cleanup_all;
if (!open && f->f_op)
open = f->f_op->open;
if (open) {
error = open(inode, f);
if (error)
goto cleanup_all;
}
if ((f->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)
i_readcount_inc(inode);
f->f_flags &= ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);
file_ra_state_init(&f->f_ra, f->f_mapping->host->i_mapping);
return 0;
cleanup_all:
fops_put(f->f_op);
file_sb_list_del(f);
if (f->f_mode & FMODE_WRITE) {
put_write_access(inode);
if (!special_file(inode->i_mode)) {
/*
* We don't consider this a real
* mnt_want/drop_write() pair
* because it all happenend right
* here, so just reset the state.
*/
file_reset_write(f);
__mnt_drop_write(f->f_path.mnt);
}
}
cleanup_file:
path_put(&f->f_path);
f->f_path.mnt = NULL;
f->f_path.dentry = NULL;
f->f_inode = NULL;
return error;
}
struct file *dentry_open(struct dentry *dentry, struct vfsmount *mnt, int flags)
{
struct file * f;
struct inode *inode;
static LIST_HEAD(kill_list);
int error;
error = -ENFILE;
f = get_empty_filp();
if (!f)
goto cleanup_dentry;
f->f_flags = flags;
f->f_mode = (flags+1) & O_ACCMODE;
inode = dentry->d_inode;
if (f->f_mode & FMODE_WRITE) {
error = get_write_access(inode);
if (error)
goto cleanup_file;
}
f->f_dentry = dentry;
f->f_vfsmnt = mnt;
f->f_pos = 0;
f->f_reada = 0;
f->f_op = fops_get(inode->i_fop);
file_move(f, &inode->i_sb->s_files);
/* preallocate kiobuf for O_DIRECT */
f->f_iobuf = NULL;
f->f_iobuf_lock = 0;
if (f->f_flags & O_DIRECT) {
error = alloc_kiovec(1, &f->f_iobuf);
if (error)
goto cleanup_all;
}
if (f->f_op && f->f_op->open) {
error = f->f_op->open(inode,f);
if (error)
goto cleanup_all;
}
f->f_flags &= ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);
return f;
cleanup_all:
if (f->f_iobuf)
free_kiovec(1, &f->f_iobuf);
fops_put(f->f_op);
if (f->f_mode & FMODE_WRITE)
put_write_access(inode);
file_move(f, &kill_list); /* out of the way.. */
f->f_dentry = NULL;
f->f_vfsmnt = NULL;
cleanup_file:
put_filp(f);
cleanup_dentry:
dput(dentry);
mntput(mnt);
return ERR_PTR(error);
}
static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt,
int flags, struct file *f,
int (*open)(struct inode *, struct file *))
{
struct inode *inode;
int error;
f->f_flags = flags;
f->f_mode = ((flags+1) & O_ACCMODE) | FMODE_LSEEK |
FMODE_PREAD | FMODE_PWRITE;
inode = dentry->d_inode;
if (f->f_mode & FMODE_WRITE) {
error = __get_file_write_access(inode, mnt);
if (error)
goto cleanup_file;
if (!special_file(inode->i_mode))
file_take_write(f);
}
f->f_mapping = inode->i_mapping;
f->f_path.dentry = dentry;
f->f_path.mnt = mnt;
f->f_pos = 0;
f->f_op = fops_get(inode->i_fop);
file_move(f, &inode->i_sb->s_files);
error = security_dentry_open(f);
if (error)
goto cleanup_all;
if (!open && f->f_op)
open = f->f_op->open;
if (open) {
error = open(inode, f);
if (error)
goto cleanup_all;
}
f->f_flags &= ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);
file_ra_state_init(&f->f_ra, f->f_mapping->host->i_mapping);
/* NB: we're sure to have correct a_ops only after f_op->open */
if (f->f_flags & O_DIRECT) {
if (!f->f_mapping->a_ops ||
((!f->f_mapping->a_ops->direct_IO) &&
(!f->f_mapping->a_ops->get_xip_mem))) {
fput(f);
f = ERR_PTR(-EINVAL);
}
}
return f;
cleanup_all:
fops_put(f->f_op);
if (f->f_mode & FMODE_WRITE) {
put_write_access(inode);
if (!special_file(inode->i_mode)) {
/*
* We don't consider this a real
* mnt_want/drop_write() pair
* because it all happenend right
* here, so just reset the state.
*/
file_reset_write(f);
mnt_drop_write(mnt);
}
}
file_kill(f);
f->f_path.dentry = NULL;
f->f_path.mnt = NULL;
cleanup_file:
put_filp(f);
dput(dentry);
mntput(mnt);
return ERR_PTR(error);
}
static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt,
int flags, struct file *f,
int (*open)(struct inode *, struct file *))
{
struct inode *inode;
int error;
f->f_flags = flags;
f->f_mode = ((flags+1) & O_ACCMODE) | FMODE_LSEEK |
FMODE_PREAD | FMODE_PWRITE;
inode = dentry->d_inode;
if (f->f_mode & FMODE_WRITE) {
error = get_write_access(inode);
if (error)
goto cleanup_file;
}
f->f_mapping = inode->i_mapping;
f->f_path.dentry = dentry;
f->f_path.mnt = mnt;
f->f_pos = 0;
f->f_op = fops_get(inode->i_fop);
file_move(f, &inode->i_sb->s_files);
if (!open && f->f_op)
open = f->f_op->open;
if (open) {
error = open(inode, f);
if (error)
goto cleanup_all;
}
f->f_flags &= ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);
file_ra_state_init(&f->f_ra, f->f_mapping->host->i_mapping);
/* NB: we're sure to have correct a_ops only after f_op->open */
if (f->f_flags & O_DIRECT) {
if (!f->f_mapping->a_ops ||
((!f->f_mapping->a_ops->direct_IO) &&
(!f->f_mapping->a_ops->get_xip_page))) {
fput(f);
f = ERR_PTR(-EINVAL);
}
}
return f;
cleanup_all:
fops_put(f->f_op);
if (f->f_mode & FMODE_WRITE)
put_write_access(inode);
file_kill(f);
f->f_path.dentry = NULL;
f->f_path.mnt = NULL;
cleanup_file:
put_filp(f);
dput(dentry);
mntput(mnt);
return ERR_PTR(error);
}
static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt, int flags, struct file *f)
{
struct inode *inode;
static LIST_HEAD(kill_list);
int error;
f->f_flags = flags;
f->f_mode = (flags+1) & O_ACCMODE;
inode = dentry->d_inode;
if (f->f_mode & FMODE_WRITE) {
error = get_write_access(inode);
if (error)
goto cleanup_file;
}
f->f_dentry = dentry;
f->f_vfsmnt = mnt;
f->f_pos = 0;
f->f_reada = 0;
f->f_op = fops_get(inode->i_fop);
file_move(f, &inode->i_sb->s_files);
/* preallocate kiobuf for O_DIRECT */
f->f_iobuf = NULL;
f->f_iobuf_lock = 0;
if (f->f_flags & O_DIRECT) {
error = alloc_kiovec(1, &f->f_iobuf);
if (error)
goto cleanup_all;
}
if (f->f_op && f->f_op->open) {
error = f->f_op->open(inode,f);
if (error)
goto cleanup_all;
}
f->f_flags &= ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);
/* NB: we're sure to have correct a_ops only after f_op->open */
if (f->f_flags & O_DIRECT) {
if (!inode->i_mapping || !inode->i_mapping->a_ops ||
!(inode->i_mapping->a_ops->direct_IO ||
inode->i_mapping->a_ops->direct_sector_IO)) {
fput(f);
f = ERR_PTR(-EINVAL);
}
}
return f;
cleanup_all:
if (f->f_iobuf)
free_kiovec(1, &f->f_iobuf);
fops_put(f->f_op);
if (f->f_mode & FMODE_WRITE)
put_write_access(inode);
file_move(f, &kill_list); /* out of the way.. */
f->f_dentry = NULL;
f->f_vfsmnt = NULL;
cleanup_file:
put_filp(f);
dput(dentry);
mntput(mnt);
return ERR_PTR(error);
}
static struct file *__dentry_open(struct _dentry *dentry, struct vfsmount *mnt,
int flags, struct file *f,
int (*open)(struct _inode *, struct file *))
{
struct _inode *inode;
int error;
struct super_block *sb;
struct _file *_f = tx_cache_get_file(f);
_f->f_flags = flags;
_f->f_mode = ((flags+1) & O_ACCMODE) | FMODE_LSEEK |
FMODE_PREAD | FMODE_PWRITE;
inode = d_get_inode(dentry);
sb = inode->i_sb;
if (_f->f_mode & FMODE_WRITE) {
error = get_write_access(parent(inode));
if (error)
goto cleanup_file;
}
f->f_mapping = inode->i_mapping;
_f->f_path.dentry = parent(dentry);
_f->f_path.mnt = mnt;
_f->f_pos = 0;
f->f_op = fops_get(inode->i_fop);
file_move(f, &sb->s_files);
if (!open && f->f_op)
open = f->f_op->open;
if (open) {
error = open(inode, f);
if (error)
goto cleanup_all;
}
_f->f_flags &= ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);
file_ra_state_init(&f->f_ra,
tx_cache_get_inode(f->f_mapping->host)->i_mapping);
/* NB: we're sure to have correct a_ops only after f_op->open */
if (_f->f_flags & O_DIRECT) {
if (!f->f_mapping->a_ops ||
((!f->f_mapping->a_ops->direct_IO) &&
(!f->f_mapping->a_ops->get_xip_page))) {
fput(f);
f = ERR_PTR(-EINVAL);
}
}
return f;
cleanup_all:
fops_put(f->f_op);
if (_f->f_mode & FMODE_WRITE)
put_write_access(parent(inode));
file_kill(f);
_f->f_path.dentry = NULL;
_f->f_path.mnt = NULL;
cleanup_file:
/* Avoid issues if we recycle this object */
if(live_transaction())
early_release(&f->xobj, 1);
put_filp(f);
dput(parent(dentry));
mntput(mnt);
return ERR_PTR(error);
}
static int do_dentry_open(struct file *f,
int (*open)(struct inode *, struct file *),
const struct cred *cred)
{
static const struct file_operations empty_fops = {};
struct inode *inode;
int error;
f->f_mode = OPEN_FMODE(f->f_flags) | FMODE_LSEEK |
FMODE_PREAD | FMODE_PWRITE;
path_get(&f->f_path);
inode = f->f_inode = f->f_path.dentry->d_inode;
f->f_mapping = inode->i_mapping;
if (unlikely(f->f_flags & O_PATH)) {
f->f_mode = FMODE_PATH;
f->f_op = &empty_fops;
return 0;
}
if (f->f_mode & FMODE_WRITE && !special_file(inode->i_mode)) {
error = get_write_access(inode);
if (unlikely(error))
goto cleanup_file;
error = __mnt_want_write(f->f_path.mnt);
if (unlikely(error)) {
put_write_access(inode);
goto cleanup_file;
}
f->f_mode |= FMODE_WRITER;
}
/* POSIX.1-2008/SUSv4 Section XSI 2.9.7 */
if (S_ISREG(inode->i_mode))
f->f_mode |= FMODE_ATOMIC_POS;
f->f_op = fops_get(inode->i_fop);
if (unlikely(WARN_ON(!f->f_op))) {
error = -ENODEV;
goto cleanup_all;
}
error = security_file_open(f, cred);
if (error)
goto cleanup_all;
error = break_lease(inode, f->f_flags);
if (error)
goto cleanup_all;
if (!open)
open = f->f_op->open;
if (open) {
error = open(inode, f);
if (error)
goto cleanup_all;
}
if ((f->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)
i_readcount_inc(inode);
if ((f->f_mode & FMODE_READ) &&
likely(f->f_op->read || f->f_op->aio_read || f->f_op->read_iter))
f->f_mode |= FMODE_CAN_READ;
if ((f->f_mode & FMODE_WRITE) &&
likely(f->f_op->write || f->f_op->aio_write || f->f_op->write_iter))
f->f_mode |= FMODE_CAN_WRITE;
f->f_flags &= ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);
file_ra_state_init(&f->f_ra, f->f_mapping->host->i_mapping);
return 0;
cleanup_all:
fops_put(f->f_op);
if (f->f_mode & FMODE_WRITER) {
put_write_access(inode);
__mnt_drop_write(f->f_path.mnt);
}
cleanup_file:
path_put(&f->f_path);
f->f_path.mnt = NULL;
f->f_path.dentry = NULL;
f->f_inode = NULL;
return error;
}
static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt,
struct file *f,
int (*open)(struct inode *, struct file *),
const struct cred *cred)
{
static const struct file_operations empty_fops = {};
struct inode *inode;
int error;
f->f_mode = OPEN_FMODE(f->f_flags) | FMODE_LSEEK |
FMODE_PREAD | FMODE_PWRITE;
if (unlikely(f->f_flags & O_PATH))
f->f_mode = FMODE_PATH;
inode = dentry->d_inode;
if (f->f_mode & FMODE_WRITE) {
error = __get_file_write_access(inode, mnt);
if (error)
goto cleanup_file;
if (!special_file(inode->i_mode))
file_take_write(f);
}
f->f_mapping = inode->i_mapping;
f->f_path.dentry = dentry;
f->f_path.mnt = mnt;
f->f_pos = 0;
file_sb_list_add(f, inode->i_sb);
if (unlikely(f->f_mode & FMODE_PATH)) {
f->f_op = &empty_fops;
return f;
}
f->f_op = fops_get(inode->i_fop);
error = security_dentry_open(f, cred);
if (error)
goto cleanup_all;
error = break_lease(inode, f->f_flags);
if (error)
goto cleanup_all;
if (!open && f->f_op)
open = f->f_op->open;
if (open) {
error = open(inode, f);
if (error)
goto cleanup_all;
}
if ((f->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)
i_readcount_inc(inode);
f->f_flags &= ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);
file_ra_state_init(&f->f_ra, f->f_mapping->host->i_mapping);
/* NB: we're sure to have correct a_ops only after f_op->open */
if (f->f_flags & O_DIRECT) {
if (!f->f_mapping->a_ops ||
((!f->f_mapping->a_ops->direct_IO) &&
(!f->f_mapping->a_ops->get_xip_mem))) {
fput(f);
f = ERR_PTR(-EINVAL);
}
}
return f;
cleanup_all:
fops_put(f->f_op);
if (f->f_mode & FMODE_WRITE) {
put_write_access(inode);
if (!special_file(inode->i_mode)) {
/*
* We don't consider this a real
* mnt_want/drop_write() pair
* because it all happenend right
* here, so just reset the state.
*/
file_reset_write(f);
mnt_drop_write(mnt);
}
}
file_sb_list_del(f);
f->f_path.dentry = NULL;
f->f_path.mnt = NULL;
cleanup_file:
put_filp(f);
dput(dentry);
mntput(mnt);
return ERR_PTR(error);
}
extern int
vnode_shadow_fop_open(
INODE_T *inode,
FILE_T *file
)
{
int err = 0;
INODE_T *real_inode;
DENT_T *rdentry = NULL;
DENT_T *oldent;
struct file_operations *oldfops;
struct vfsmount *oldmnt, *newmnt;
VNODE_T *cvp;
oldmnt = file->f_vfsmnt;
oldent = file->f_dentry;
ASSERT(D_COUNT(oldent));
/* The Linux kernel has stopped ignoring the O_DIRECT flag.
* The problem is that they wait until after they call the fop open
* function to check the inode to see if it will support direct I/O.
* But they get the inode pointer before they call us and check the
* inode after we return so they never check the actual inode we open
* but only the shadow one. Their error handling never comes back to
* us and they release their old pointers and not our new ones. The
* only choice we have is to not allow O_DIRECT on shadow files.
*/
if (file->f_flags & O_DIRECT) {
err = -EINVAL;
goto out_nolock;
}
/* Get the real dentry */
rdentry = REALDENTRY_LOCKED(oldent, &cvp);
if (rdentry == NULL) {
err = -ENOENT;
goto out_nolock;
}
VNODE_DGET(rdentry); /* protect rdentry->d_inode */
if (rdentry->d_inode == NULL) {
/* delete race */
err = -ENOENT;
goto out;
}
newmnt = MDKI_MNTGET(REALVFSMNT(oldent));
if (newmnt == NULL) {
err = -EOPNOTSUPP; /* XXX */
goto out;
}
/* Check that we can write to this file. Clean up the count on the
* shadow inode.
*/
if (file->f_mode & FMODE_WRITE) {
err = get_write_access(rdentry->d_inode);
if (err) {
MDKI_MNTPUT(newmnt);
goto out;
}
}
real_inode = rdentry->d_inode;
/*
* Swap the file structure contents to point at the underlying object.
*/
/* In Linux 2.6 they added the mapping stuff to the file so we have to set
** that up here, too.
*/
file->f_mapping = real_inode->i_mapping;
VNLAYER_RA_STATE_INIT(&(file->f_ra), file->f_mapping);
file->f_dentry = VNODE_DGET(rdentry);
oldfops = file->f_op;
file->f_vfsmnt = newmnt;
file->f_op = fops_get(real_inode->i_fop);
if (real_inode->i_fop && !file->f_op)
/* If we failed to get the reference to a non-NULL op, bail out */
err = -EIO; /* XXX? better error code */
if (!err) {
/* Move the file to the file list for the real superblock
* and remove it from the shadow list
*/
/* It would be better to use file_move() but it's not exported */
file_list_lock();
list_del(&file->f_list);
list_add(&file->f_list, &real_inode->i_sb->s_files);
file_list_unlock();
if (file->f_op && file->f_op->open) {
err = (*file->f_op->open)(real_inode, file);
if (err) {
/* restore our file to the list on our super block */
file_list_lock();
list_del(&file->f_list);
list_add(&file->f_list, &oldent->d_inode->i_sb->s_files);
file_list_unlock();
}
}
}
if (err) {
/* MUST put back old dentry/fops to get accounting right in upper
* layer. */
put_write_access(rdentry->d_inode);
if (file->f_dentry)
VNODE_DPUT(file->f_dentry);
if (file->f_op)
fops_put(file->f_op);
MDKI_MNTPUT(file->f_vfsmnt);
file->f_vfsmnt = oldmnt;
file->f_dentry = oldent;
file->f_op = oldfops;
} else {
put_write_access(oldent->d_inode);
VNODE_DPUT(oldent);
/* Drop reference now that we've dropped our use of the file ops */
fops_put(oldfops);
MDKI_MNTPUT(oldmnt);
}
out:
VNODE_DPUT(rdentry);
REALDENTRY_UNLOCK(oldent, cvp);
out_nolock:
MDKI_TRACE(TRACE_OPEN, "%s: opened vp=%p fp=%p rdent=%p rdcnt=%d fcnt=%d"
", err %d\n", __func__,
inode, file, rdentry, rdentry ? D_COUNT(rdentry) : 0, F_COUNT(file), -err);
return(err);
}
