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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse 

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse:
  fuse: invalidation reverse calls
  fuse: allow umask processing in userspace
  fuse: fix bad return value in fuse_file_poll()
  fuse: fix return value of fuse_dev_write()
This commit is contained in:
Linus Torvalds 2009-07-01 11:20:46 -07:00
parent a15a519ed6 3b463ae0c6
commit fa172f4006
6 changed files with 262 additions and 11 deletions
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83
fs/fuse/dev.c
View File

@ -849,6 +849,81 @@ err:
return err;
}
static int fuse_notify_inval_inode(struct fuse_conn *fc, unsigned int size,
struct fuse_copy_state *cs)
{
struct fuse_notify_inval_inode_out outarg;
int err = -EINVAL;
if (size != sizeof(outarg))
goto err;
err = fuse_copy_one(cs, &outarg, sizeof(outarg));
if (err)
goto err;
fuse_copy_finish(cs);
down_read(&fc->killsb);
err = -ENOENT;
if (!fc->sb)
goto err_unlock;
err = fuse_reverse_inval_inode(fc->sb, outarg.ino,
outarg.off, outarg.len);
err_unlock:
up_read(&fc->killsb);
return err;
err:
fuse_copy_finish(cs);
return err;
}
static int fuse_notify_inval_entry(struct fuse_conn *fc, unsigned int size,
struct fuse_copy_state *cs)
{
struct fuse_notify_inval_entry_out outarg;
int err = -EINVAL;
char buf[FUSE_NAME_MAX+1];
struct qstr name;
if (size < sizeof(outarg))
goto err;
err = fuse_copy_one(cs, &outarg, sizeof(outarg));
if (err)
goto err;
err = -ENAMETOOLONG;
if (outarg.namelen > FUSE_NAME_MAX)
goto err;
name.name = buf;
name.len = outarg.namelen;
err = fuse_copy_one(cs, buf, outarg.namelen + 1);
if (err)
goto err;
fuse_copy_finish(cs);
buf[outarg.namelen] = 0;
name.hash = full_name_hash(name.name, name.len);
down_read(&fc->killsb);
err = -ENOENT;
if (!fc->sb)
goto err_unlock;
err = fuse_reverse_inval_entry(fc->sb, outarg.parent, &name);
err_unlock:
up_read(&fc->killsb);
return err;
err:
fuse_copy_finish(cs);
return err;
}
static int fuse_notify(struct fuse_conn *fc, enum fuse_notify_code code,
unsigned int size, struct fuse_copy_state *cs)
{
@ -856,6 +931,12 @@ static int fuse_notify(struct fuse_conn *fc, enum fuse_notify_code code,
case FUSE_NOTIFY_POLL:
return fuse_notify_poll(fc, size, cs);
case FUSE_NOTIFY_INVAL_INODE:
return fuse_notify_inval_inode(fc, size, cs);
case FUSE_NOTIFY_INVAL_ENTRY:
return fuse_notify_inval_entry(fc, size, cs);
default:
fuse_copy_finish(cs);
return -EINVAL;
@ -910,7 +991,7 @@ static ssize_t fuse_dev_write(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos)
{
int err;
unsigned nbytes = iov_length(iov, nr_segs);
size_t nbytes = iov_length(iov, nr_segs);
struct fuse_req *req;
struct fuse_out_header oh;
struct fuse_copy_state cs;

57
fs/fuse/dir.c
View File

@ -375,7 +375,7 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode,
struct fuse_conn *fc = get_fuse_conn(dir);
struct fuse_req *req;
struct fuse_req *forget_req;
struct fuse_open_in inarg;
struct fuse_create_in inarg;
struct fuse_open_out outopen;
struct fuse_entry_out outentry;
struct fuse_file *ff;
@ -399,15 +399,20 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode,
if (!ff)
goto out_put_request;
if (!fc->dont_mask)
mode &= ~current_umask();
flags &= ~O_NOCTTY;
memset(&inarg, 0, sizeof(inarg));
memset(&outentry, 0, sizeof(outentry));
inarg.flags = flags;
inarg.mode = mode;
inarg.umask = current_umask();
req->in.h.opcode = FUSE_CREATE;
req->in.h.nodeid = get_node_id(dir);
req->in.numargs = 2;
req->in.args[0].size = sizeof(inarg);
req->in.args[0].size = fc->minor < 12 ? sizeof(struct fuse_open_in) :
sizeof(inarg);
req->in.args[0].value = &inarg;
req->in.args[1].size = entry->d_name.len + 1;
req->in.args[1].value = entry->d_name.name;
@ -546,12 +551,17 @@ static int fuse_mknod(struct inode *dir, struct dentry *entry, int mode,
if (IS_ERR(req))
return PTR_ERR(req);
if (!fc->dont_mask)
mode &= ~current_umask();
memset(&inarg, 0, sizeof(inarg));
inarg.mode = mode;
inarg.rdev = new_encode_dev(rdev);
inarg.umask = current_umask();
req->in.h.opcode = FUSE_MKNOD;
req->in.numargs = 2;
req->in.args[0].size = sizeof(inarg);
req->in.args[0].size = fc->minor < 12 ? FUSE_COMPAT_MKNOD_IN_SIZE :
sizeof(inarg);
req->in.args[0].value = &inarg;
req->in.args[1].size = entry->d_name.len + 1;
req->in.args[1].value = entry->d_name.name;
@ -578,8 +588,12 @@ static int fuse_mkdir(struct inode *dir, struct dentry *entry, int mode)
if (IS_ERR(req))
return PTR_ERR(req);
if (!fc->dont_mask)
mode &= ~current_umask();
memset(&inarg, 0, sizeof(inarg));
inarg.mode = mode;
inarg.umask = current_umask();
req->in.h.opcode = FUSE_MKDIR;
req->in.numargs = 2;
req->in.args[0].size = sizeof(inarg);
@ -845,6 +859,43 @@ int fuse_update_attributes(struct inode *inode, struct kstat *stat,
return err;
}
int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
struct qstr *name)
{
int err = -ENOTDIR;
struct inode *parent;
struct dentry *dir;
struct dentry *entry;
parent = ilookup5(sb, parent_nodeid, fuse_inode_eq, &parent_nodeid);
if (!parent)
return -ENOENT;
mutex_lock(&parent->i_mutex);
if (!S_ISDIR(parent->i_mode))
goto unlock;
err = -ENOENT;
dir = d_find_alias(parent);
if (!dir)
goto unlock;
entry = d_lookup(dir, name);
dput(dir);
if (!entry)
goto unlock;
fuse_invalidate_attr(parent);
fuse_invalidate_entry(entry);
dput(entry);
err = 0;
unlock:
mutex_unlock(&parent->i_mutex);
iput(parent);
return err;
}
/*
* Calling into a user-controlled filesystem gives the filesystem
* daemon ptrace-like capabilities over the requester process. This

2
fs/fuse/file.c
View File

@ -1922,7 +1922,7 @@ unsigned fuse_file_poll(struct file *file, poll_table *wait)
req = fuse_get_req(fc);
if (IS_ERR(req))
return PTR_ERR(req);
return POLLERR;
req->in.h.opcode = FUSE_POLL;
req->in.h.nodeid = ff->nodeid;

27
fs/fuse/fuse_i.h
View File

@ -446,6 +446,9 @@ struct fuse_conn {
/** Do multi-page cached writes */
unsigned big_writes:1;
/** Don't apply umask to creation modes */
unsigned dont_mask:1;
/** The number of requests waiting for completion */
atomic_t num_waiting;
@ -481,6 +484,12 @@ struct fuse_conn {
/** Called on final put */
void (*release)(struct fuse_conn *);
/** Super block for this connection. */
struct super_block *sb;
/** Read/write semaphore to hold when accessing sb. */
struct rw_semaphore killsb;
};
static inline struct fuse_conn *get_fuse_conn_super(struct super_block *sb)
@ -508,6 +517,11 @@ extern const struct file_operations fuse_dev_operations;
extern const struct dentry_operations fuse_dentry_operations;
/**
* Inode to nodeid comparison.
*/
int fuse_inode_eq(struct inode *inode, void *_nodeidp);
/**
* Get a filled in inode
*/
@ -708,6 +722,19 @@ void fuse_release_nowrite(struct inode *inode);
u64 fuse_get_attr_version(struct fuse_conn *fc);
/**
* File-system tells the kernel to invalidate cache for the given node id.
*/
int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid,
loff_t offset, loff_t len);
/**
* File-system tells the kernel to invalidate parent attributes and
* the dentry matching parent/name.
*/
int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
struct qstr *name);
int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file,
bool isdir);
ssize_t fuse_direct_io(struct file *file, const char __user *buf,

68
fs/fuse/inode.c
View File

@ -206,7 +206,7 @@ static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr)
BUG();
}
static int fuse_inode_eq(struct inode *inode, void *_nodeidp)
int fuse_inode_eq(struct inode *inode, void *_nodeidp)
{
u64 nodeid = *(u64 *) _nodeidp;
if (get_node_id(inode) == nodeid)
@ -257,6 +257,31 @@ struct inode *fuse_iget(struct super_block *sb, u64 nodeid,
return inode;
}
int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid,
loff_t offset, loff_t len)
{
struct inode *inode;
pgoff_t pg_start;
pgoff_t pg_end;
inode = ilookup5(sb, nodeid, fuse_inode_eq, &nodeid);
if (!inode)
return -ENOENT;
fuse_invalidate_attr(inode);
if (offset >= 0) {
pg_start = offset >> PAGE_CACHE_SHIFT;
if (len <= 0)
pg_end = -1;
else
pg_end = (offset + len - 1) >> PAGE_CACHE_SHIFT;
invalidate_inode_pages2_range(inode->i_mapping,
pg_start, pg_end);
}
iput(inode);
return 0;
}
static void fuse_umount_begin(struct super_block *sb)
{
fuse_abort_conn(get_fuse_conn_super(sb));
@ -480,6 +505,7 @@ void fuse_conn_init(struct fuse_conn *fc)
memset(fc, 0, sizeof(*fc));
spin_lock_init(&fc->lock);
mutex_init(&fc->inst_mutex);
init_rwsem(&fc->killsb);
atomic_set(&fc->count, 1);
init_waitqueue_head(&fc->waitq);
init_waitqueue_head(&fc->blocked_waitq);
@ -725,6 +751,8 @@ static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
}
if (arg->flags & FUSE_BIG_WRITES)
fc->big_writes = 1;
if (arg->flags & FUSE_DONT_MASK)
fc->dont_mask = 1;
} else {
ra_pages = fc->max_read / PAGE_CACHE_SIZE;
fc->no_lock = 1;
@ -748,7 +776,7 @@ static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
arg->minor = FUSE_KERNEL_MINOR_VERSION;
arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE;
arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC |
FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES;
FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK;
req->in.h.opcode = FUSE_INIT;
req->in.numargs = 1;
req->in.args[0].size = sizeof(*arg);
@ -860,10 +888,16 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
fuse_conn_init(fc);
fc->dev = sb->s_dev;
fc->sb = sb;
err = fuse_bdi_init(fc, sb);
if (err)
goto err_put_conn;
/* Handle umasking inside the fuse code */
if (sb->s_flags & MS_POSIXACL)
fc->dont_mask = 1;
sb->s_flags |= MS_POSIXACL;
fc->release = fuse_free_conn;
fc->flags = d.flags;
fc->user_id = d.user_id;
@ -941,12 +975,25 @@ static int fuse_get_sb(struct file_system_type *fs_type,
return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super, mnt);
}
static void fuse_kill_sb_anon(struct super_block *sb)
{
struct fuse_conn *fc = get_fuse_conn_super(sb);
if (fc) {
down_write(&fc->killsb);
fc->sb = NULL;
up_write(&fc->killsb);
}
kill_anon_super(sb);
}
static struct file_system_type fuse_fs_type = {
.owner = THIS_MODULE,
.name = "fuse",
.fs_flags = FS_HAS_SUBTYPE,
.get_sb = fuse_get_sb,
.kill_sb = kill_anon_super,
.kill_sb = fuse_kill_sb_anon,
};
#ifdef CONFIG_BLOCK
@ -958,11 +1005,24 @@ static int fuse_get_sb_blk(struct file_system_type *fs_type,
mnt);
}
static void fuse_kill_sb_blk(struct super_block *sb)
{
struct fuse_conn *fc = get_fuse_conn_super(sb);
if (fc) {
down_write(&fc->killsb);
fc->sb = NULL;
up_write(&fc->killsb);
}
kill_block_super(sb);
}
static struct file_system_type fuseblk_fs_type = {
.owner = THIS_MODULE,
.name = "fuseblk",
.get_sb = fuse_get_sb_blk,
.kill_sb = kill_block_super,
.kill_sb = fuse_kill_sb_blk,
.fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE,
};

36
include/linux/fuse.h
View File

@ -25,6 +25,11 @@
* - add IOCTL message
* - add unsolicited notification support
* - add POLL message and NOTIFY_POLL notification
*
* 7.12
* - add umask flag to input argument of open, mknod and mkdir
* - add notification messages for invalidation of inodes and
* directory entries
*/
#ifndef _LINUX_FUSE_H
@ -36,7 +41,7 @@
#define FUSE_KERNEL_VERSION 7
/** Minor version number of this interface */
#define FUSE_KERNEL_MINOR_VERSION 11
#define FUSE_KERNEL_MINOR_VERSION 12
/** The node ID of the root inode */
#define FUSE_ROOT_ID 1
@ -112,6 +117,7 @@ struct fuse_file_lock {
* INIT request/reply flags
*
* FUSE_EXPORT_SUPPORT: filesystem handles lookups of "." and ".."
* FUSE_DONT_MASK: don't apply umask to file mode on create operations
*/
#define FUSE_ASYNC_READ (1 << 0)
#define FUSE_POSIX_LOCKS (1 << 1)
@ -119,6 +125,7 @@ struct fuse_file_lock {
#define FUSE_ATOMIC_O_TRUNC (1 << 3)
#define FUSE_EXPORT_SUPPORT (1 << 4)
#define FUSE_BIG_WRITES (1 << 5)
#define FUSE_DONT_MASK (1 << 6)
/**
* CUSE INIT request/reply flags
@ -224,6 +231,8 @@ enum fuse_opcode {
enum fuse_notify_code {
FUSE_NOTIFY_POLL = 1,
FUSE_NOTIFY_INVAL_INODE = 2,
FUSE_NOTIFY_INVAL_ENTRY = 3,
FUSE_NOTIFY_CODE_MAX,
};
@ -262,14 +271,18 @@ struct fuse_attr_out {
struct fuse_attr attr;
};
#define FUSE_COMPAT_MKNOD_IN_SIZE 8
struct fuse_mknod_in {
__u32 mode;
__u32 rdev;
__u32 umask;
__u32 padding;
};
struct fuse_mkdir_in {
__u32 mode;
__u32 padding;
__u32 umask;
};
struct fuse_rename_in {
@ -300,8 +313,15 @@ struct fuse_setattr_in {
};
struct fuse_open_in {
__u32 flags;
__u32 unused;
};
struct fuse_create_in {
__u32 flags;
__u32 mode;
__u32 umask;
__u32 padding;
};
struct fuse_open_out {
@ -508,4 +528,16 @@ struct fuse_dirent {
#define FUSE_DIRENT_SIZE(d) \
FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + (d)->namelen)
struct fuse_notify_inval_inode_out {
__u64 ino;
__s64 off;
__s64 len;
};
struct fuse_notify_inval_entry_out {
__u64 parent;
__u32 namelen;
__u32 padding;
};
#endif /* _LINUX_FUSE_H */