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fuse update for 5.4 

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Merge tag 'fuse-update-5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse

Pull fuse updates from Miklos Szeredi:

 - Continue separating the transport (user/kernel communication) and the
   filesystem layers of fuse. Getting rid of most layering violations
   will allow for easier cleanup and optimization later on.

 - Prepare for the addition of the virtio-fs filesystem. The actual
   filesystem will be introduced by a separate pull request.

 - Convert to new mount API.

 - Various fixes, optimizations and cleanups.

* tag 'fuse-update-5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse: (55 commits)
  fuse: Make fuse_args_to_req static
  fuse: fix memleak in cuse_channel_open
  fuse: fix beyond-end-of-page access in fuse_parse_cache()
  fuse: unexport fuse_put_request
  fuse: kmemcg account fs data
  fuse: on 64-bit store time in d_fsdata directly
  fuse: fix missing unlock_page in fuse_writepage()
  fuse: reserve byteswapped init opcodes
  fuse: allow skipping control interface and forced unmount
  fuse: dissociate DESTROY from fuseblk
  fuse: delete dentry if timeout is zero
  fuse: separate fuse device allocation and installation in fuse_conn
  fuse: add fuse_iqueue_ops callbacks
  fuse: extract fuse_fill_super_common()
  fuse: export fuse_dequeue_forget() function
  fuse: export fuse_get_unique()
  fuse: export fuse_send_init_request()
  fuse: export fuse_len_args()
  fuse: export fuse_end_request()
  fuse: fix request limit
  ...
This commit is contained in:
Linus Torvalds 2019-09-25 09:55:59 -07:00
parent 301310c6d2 5addcd5dbd
commit 7b1373dd6e
14 changed files with 1747 additions and 1631 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
fs/fs_context.c
View File

@ -504,7 +504,6 @@ void put_fs_context(struct fs_context *fc)
put_net(fc->net_ns);
put_user_ns(fc->user_ns);
put_cred(fc->cred);
kfree(fc->subtype);
put_fc_log(fc);
put_filesystem(fc->fs_type);
kfree(fc->source);
@ -571,17 +570,6 @@ static int legacy_parse_param(struct fs_context *fc, struct fs_parameter *param)
return 0;
}
if ((fc->fs_type->fs_flags & FS_HAS_SUBTYPE) &&
strcmp(param->key, "subtype") == 0) {
if (param->type != fs_value_is_string)
return invalf(fc, "VFS: Legacy: Non-string subtype");
if (fc->subtype)
return invalf(fc, "VFS: Legacy: Multiple subtype");
fc->subtype = param->string;
param->string = NULL;
return 0;
}
if (ctx->param_type == LEGACY_FS_MONOLITHIC_PARAMS)
return invalf(fc, "VFS: Legacy: Can't mix monolithic and individual options");
@ -738,8 +726,6 @@ void vfs_clean_context(struct fs_context *fc)
fc->s_fs_info = NULL;
fc->sb_flags = 0;
security_free_mnt_opts(&fc->security);
kfree(fc->subtype);
fc->subtype = NULL;
kfree(fc->source);
fc->source = NULL;

99
fs/fuse/cuse.c
View File

@ -142,11 +142,10 @@ static int cuse_open(struct inode *inode, struct file *file)
static int cuse_release(struct inode *inode, struct file *file)
{
struct fuse_inode *fi = get_fuse_inode(inode);
struct fuse_file *ff = file->private_data;
struct fuse_conn *fc = ff->fc;
fuse_sync_release(fi, ff, file->f_flags);
fuse_sync_release(NULL, ff, file->f_flags);
fuse_conn_put(fc);
return 0;
@ -299,6 +298,14 @@ static void cuse_gendev_release(struct device *dev)
kfree(dev);
}
struct cuse_init_args {
struct fuse_args_pages ap;
struct cuse_init_in in;
struct cuse_init_out out;
struct page *page;
struct fuse_page_desc desc;
};
/**
* cuse_process_init_reply - finish initializing CUSE channel
*
@ -306,21 +313,22 @@ static void cuse_gendev_release(struct device *dev)
* required data structures for it. Please read the comment at the
* top of this file for high level overview.
*/
static void cuse_process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
static void cuse_process_init_reply(struct fuse_conn *fc,
struct fuse_args *args, int error)
{
struct cuse_init_args *ia = container_of(args, typeof(*ia), ap.args);
struct fuse_args_pages *ap = &ia->ap;
struct cuse_conn *cc = fc_to_cc(fc), *pos;
struct cuse_init_out *arg = req->out.args[0].value;
struct page *page = req->pages[0];
struct cuse_init_out *arg = &ia->out;
struct page *page = ap->pages[0];
struct cuse_devinfo devinfo = { };
struct device *dev;
struct cdev *cdev;
dev_t devt;
int rc, i;
if (req->out.h.error ||
arg->major != FUSE_KERNEL_VERSION || arg->minor < 11) {
if (error || arg->major != FUSE_KERNEL_VERSION || arg->minor < 11)
goto err;
}
fc->minor = arg->minor;
fc->max_read = max_t(unsigned, arg->max_read, 4096);
@ -329,7 +337,7 @@ static void cuse_process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
/* parse init reply */
cc->unrestricted_ioctl = arg->flags & CUSE_UNRESTRICTED_IOCTL;
rc = cuse_parse_devinfo(page_address(page), req->out.args[1].size,
rc = cuse_parse_devinfo(page_address(page), ap->args.out_args[1].size,
&devinfo);
if (rc)
goto err;
@ -396,7 +404,7 @@ static void cuse_process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
dev_set_uevent_suppress(dev, 0);
kobject_uevent(&dev->kobj, KOBJ_ADD);
out:
kfree(arg);
kfree(ia);
__free_page(page);
return;
@ -415,55 +423,49 @@ err:
static int cuse_send_init(struct cuse_conn *cc)
{
int rc;
struct fuse_req *req;
struct page *page;
struct fuse_conn *fc = &cc->fc;
struct cuse_init_in *arg;
void *outarg;
struct cuse_init_args *ia;
struct fuse_args_pages *ap;
BUILD_BUG_ON(CUSE_INIT_INFO_MAX > PAGE_SIZE);
req = fuse_get_req_for_background(fc, 1);
if (IS_ERR(req)) {
rc = PTR_ERR(req);
goto err;
}
rc = -ENOMEM;
page = alloc_page(GFP_KERNEL | __GFP_ZERO);
if (!page)
goto err_put_req;
goto err;
outarg = kzalloc(sizeof(struct cuse_init_out), GFP_KERNEL);
if (!outarg)
ia = kzalloc(sizeof(*ia), GFP_KERNEL);
if (!ia)
goto err_free_page;
arg = &req->misc.cuse_init_in;
arg->major = FUSE_KERNEL_VERSION;
arg->minor = FUSE_KERNEL_MINOR_VERSION;
arg->flags |= CUSE_UNRESTRICTED_IOCTL;
req->in.h.opcode = CUSE_INIT;
req->in.numargs = 1;
req->in.args[0].size = sizeof(struct cuse_init_in);
req->in.args[0].value = arg;
req->out.numargs = 2;
req->out.args[0].size = sizeof(struct cuse_init_out);
req->out.args[0].value = outarg;
req->out.args[1].size = CUSE_INIT_INFO_MAX;
req->out.argvar = 1;
req->out.argpages = 1;
req->pages[0] = page;
req->page_descs[0].length = req->out.args[1].size;
req->num_pages = 1;
req->end = cuse_process_init_reply;
fuse_request_send_background(fc, req);
return 0;
ap = &ia->ap;
ia->in.major = FUSE_KERNEL_VERSION;
ia->in.minor = FUSE_KERNEL_MINOR_VERSION;
ia->in.flags |= CUSE_UNRESTRICTED_IOCTL;
ap->args.opcode = CUSE_INIT;
ap->args.in_numargs = 1;
ap->args.in_args[0].size = sizeof(ia->in);
ap->args.in_args[0].value = &ia->in;
ap->args.out_numargs = 2;
ap->args.out_args[0].size = sizeof(ia->out);
ap->args.out_args[0].value = &ia->out;
ap->args.out_args[1].size = CUSE_INIT_INFO_MAX;
ap->args.out_argvar = 1;
ap->args.out_pages = 1;
ap->num_pages = 1;
ap->pages = &ia->page;
ap->descs = &ia->desc;
ia->page = page;
ia->desc.length = ap->args.out_args[1].size;
ap->args.end = cuse_process_init_reply;
rc = fuse_simple_background(fc, &ap->args, GFP_KERNEL);
if (rc) {
kfree(ia);
err_free_page:
__free_page(page);
err_put_req:
fuse_put_request(fc, req);
__free_page(page);
}
err:
return rc;
}
@ -504,9 +506,9 @@ static int cuse_channel_open(struct inode *inode, struct file *file)
* Limit the cuse channel to requests that can
* be represented in file->f_cred->user_ns.
*/
fuse_conn_init(&cc->fc, file->f_cred->user_ns);
fuse_conn_init(&cc->fc, file->f_cred->user_ns, &fuse_dev_fiq_ops, NULL);
fud = fuse_dev_alloc(&cc->fc);
fud = fuse_dev_alloc_install(&cc->fc);
if (!fud) {
kfree(cc);
return -ENOMEM;
@ -519,6 +521,7 @@ static int cuse_channel_open(struct inode *inode, struct file *file)
rc = cuse_send_init(cc);
if (rc) {
fuse_dev_free(fud);
fuse_conn_put(&cc->fc);
return rc;
}
file->private_data = fud;

664
fs/fuse/dev.c
View File

File diff suppressed because it is too large Load Diff

285
fs/fuse/dir.c
View File

@ -24,20 +24,54 @@ static void fuse_advise_use_readdirplus(struct inode *dir)
set_bit(FUSE_I_ADVISE_RDPLUS, &fi->state);
}
#if BITS_PER_LONG >= 64
static inline void __fuse_dentry_settime(struct dentry *entry, u64 time)
{
entry->d_fsdata = (void *) time;
}
static inline u64 fuse_dentry_time(const struct dentry *entry)
{
return (u64)entry->d_fsdata;
}
#else
union fuse_dentry {
u64 time;
struct rcu_head rcu;
};
static inline void fuse_dentry_settime(struct dentry *entry, u64 time)
static inline void __fuse_dentry_settime(struct dentry *dentry, u64 time)
{
((union fuse_dentry *) entry->d_fsdata)->time = time;
((union fuse_dentry *) dentry->d_fsdata)->time = time;
}
static inline u64 fuse_dentry_time(struct dentry *entry)
static inline u64 fuse_dentry_time(const struct dentry *entry)
{
return ((union fuse_dentry *) entry->d_fsdata)->time;
}
#endif
static void fuse_dentry_settime(struct dentry *dentry, u64 time)
{
struct fuse_conn *fc = get_fuse_conn_super(dentry->d_sb);
bool delete = !time && fc->delete_stale;
/*
* Mess with DCACHE_OP_DELETE because dput() will be faster without it.
* Don't care about races, either way it's just an optimization
*/
if ((!delete && (dentry->d_flags & DCACHE_OP_DELETE)) ||
(delete && !(dentry->d_flags & DCACHE_OP_DELETE))) {
spin_lock(&dentry->d_lock);
if (!delete)
dentry->d_flags &= ~DCACHE_OP_DELETE;
else
dentry->d_flags |= DCACHE_OP_DELETE;
spin_unlock(&dentry->d_lock);
}
__fuse_dentry_settime(dentry, time);
}
/*
* FUSE caches dentries and attributes with separate timeout. The
@ -139,14 +173,14 @@ static void fuse_lookup_init(struct fuse_conn *fc, struct fuse_args *args,
struct fuse_entry_out *outarg)
{
memset(outarg, 0, sizeof(struct fuse_entry_out));
args->in.h.opcode = FUSE_LOOKUP;
args->in.h.nodeid = nodeid;
args->in.numargs = 1;
args->in.args[0].size = name->len + 1;
args->in.args[0].value = name->name;
args->out.numargs = 1;
args->out.args[0].size = sizeof(struct fuse_entry_out);
args->out.args[0].value = outarg;
args->opcode = FUSE_LOOKUP;
args->nodeid = nodeid;
args->in_numargs = 1;
args->in_args[0].size = name->len + 1;
args->in_args[0].value = name->name;
args->out_numargs = 1;
args->out_args[0].size = sizeof(struct fuse_entry_out);
args->out_args[0].value = outarg;
}
/*
@ -242,9 +276,11 @@ invalid:
goto out;
}
#if BITS_PER_LONG < 64
static int fuse_dentry_init(struct dentry *dentry)
{
dentry->d_fsdata = kzalloc(sizeof(union fuse_dentry), GFP_KERNEL);
dentry->d_fsdata = kzalloc(sizeof(union fuse_dentry),
GFP_KERNEL_ACCOUNT | __GFP_RECLAIMABLE);
return dentry->d_fsdata ? 0 : -ENOMEM;
}
@ -254,16 +290,27 @@ static void fuse_dentry_release(struct dentry *dentry)
kfree_rcu(fd, rcu);
}
#endif
static int fuse_dentry_delete(const struct dentry *dentry)
{
return time_before64(fuse_dentry_time(dentry), get_jiffies_64());
}
const struct dentry_operations fuse_dentry_operations = {
.d_revalidate = fuse_dentry_revalidate,
.d_delete = fuse_dentry_delete,
#if BITS_PER_LONG < 64
.d_init = fuse_dentry_init,
.d_release = fuse_dentry_release,
#endif
};
const struct dentry_operations fuse_root_dentry_operations = {
#if BITS_PER_LONG < 64
.d_init = fuse_dentry_init,
.d_release = fuse_dentry_release,
#endif
};
int fuse_valid_type(int m)
@ -410,18 +457,18 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry,
inarg.flags = flags;
inarg.mode = mode;
inarg.umask = current_umask();
args.in.h.opcode = FUSE_CREATE;
args.in.h.nodeid = get_node_id(dir);
args.in.numargs = 2;
args.in.args[0].size = sizeof(inarg);
args.in.args[0].value = &inarg;
args.in.args[1].size = entry->d_name.len + 1;
args.in.args[1].value = entry->d_name.name;
args.out.numargs = 2;
args.out.args[0].size = sizeof(outentry);
args.out.args[0].value = &outentry;
args.out.args[1].size = sizeof(outopen);
args.out.args[1].value = &outopen;
args.opcode = FUSE_CREATE;
args.nodeid = get_node_id(dir);
args.in_numargs = 2;
args.in_args[0].size = sizeof(inarg);
args.in_args[0].value = &inarg;
args.in_args[1].size = entry->d_name.len + 1;
args.in_args[1].value = entry->d_name.name;
args.out_numargs = 2;
args.out_args[0].size = sizeof(outentry);
args.out_args[0].value = &outentry;
args.out_args[1].size = sizeof(outopen);
args.out_args[1].value = &outopen;
err = fuse_simple_request(fc, &args);
if (err)
goto out_free_ff;
@ -526,10 +573,10 @@ static int create_new_entry(struct fuse_conn *fc, struct fuse_args *args,
return -ENOMEM;
memset(&outarg, 0, sizeof(outarg));
args->in.h.nodeid = get_node_id(dir);
args->out.numargs = 1;
args->out.args[0].size = sizeof(outarg);
args->out.args[0].value = &outarg;
args->nodeid = get_node_id(dir);
args->out_numargs = 1;
args->out_args[0].size = sizeof(outarg);
args->out_args[0].value = &outarg;
err = fuse_simple_request(fc, args);
if (err)
goto out_put_forget_req;
@ -582,12 +629,12 @@ static int fuse_mknod(struct inode *dir, struct dentry *entry, umode_t mode,
inarg.mode = mode;
inarg.rdev = new_encode_dev(rdev);
inarg.umask = current_umask();
args.in.h.opcode = FUSE_MKNOD;
args.in.numargs = 2;
args.in.args[0].size = sizeof(inarg);
args.in.args[0].value = &inarg;
args.in.args[1].size = entry->d_name.len + 1;
args.in.args[1].value = entry->d_name.name;
args.opcode = FUSE_MKNOD;
args.in_numargs = 2;
args.in_args[0].size = sizeof(inarg);
args.in_args[0].value = &inarg;
args.in_args[1].size = entry->d_name.len + 1;
args.in_args[1].value = entry->d_name.name;
return create_new_entry(fc, &args, dir, entry, mode);
}
@ -609,12 +656,12 @@ static int fuse_mkdir(struct inode *dir, struct dentry *entry, umode_t mode)
memset(&inarg, 0, sizeof(inarg));
inarg.mode = mode;
inarg.umask = current_umask();
args.in.h.opcode = FUSE_MKDIR;
args.in.numargs = 2;
args.in.args[0].size = sizeof(inarg);
args.in.args[0].value = &inarg;
args.in.args[1].size = entry->d_name.len + 1;
args.in.args[1].value = entry->d_name.name;
args.opcode = FUSE_MKDIR;
args.in_numargs = 2;
args.in_args[0].size = sizeof(inarg);
args.in_args[0].value = &inarg;
args.in_args[1].size = entry->d_name.len + 1;
args.in_args[1].value = entry->d_name.name;
return create_new_entry(fc, &args, dir, entry, S_IFDIR);
}
@ -625,12 +672,12 @@ static int fuse_symlink(struct inode *dir, struct dentry *entry,
unsigned len = strlen(link) + 1;
FUSE_ARGS(args);
args.in.h.opcode = FUSE_SYMLINK;
args.in.numargs = 2;
args.in.args[0].size = entry->d_name.len + 1;
args.in.args[0].value = entry->d_name.name;
args.in.args[1].size = len;
args.in.args[1].value = link;
args.opcode = FUSE_SYMLINK;
args.in_numargs = 2;
args.in_args[0].size = entry->d_name.len + 1;
args.in_args[0].value = entry->d_name.name;
args.in_args[1].size = len;
args.in_args[1].value = link;
return create_new_entry(fc, &args, dir, entry, S_IFLNK);
}
@ -648,11 +695,11 @@ static int fuse_unlink(struct inode *dir, struct dentry *entry)
struct fuse_conn *fc = get_fuse_conn(dir);
FUSE_ARGS(args);
args.in.h.opcode = FUSE_UNLINK;
args.in.h.nodeid = get_node_id(dir);
args.in.numargs = 1;
args.in.args[0].size = entry->d_name.len + 1;
args.in.args[0].value = entry->d_name.name;
args.opcode = FUSE_UNLINK;
args.nodeid = get_node_id(dir);
args.in_numargs = 1;
args.in_args[0].size = entry->d_name.len + 1;
args.in_args[0].value = entry->d_name.name;
err = fuse_simple_request(fc, &args);
if (!err) {
struct inode *inode = d_inode(entry);
@ -684,11 +731,11 @@ static int fuse_rmdir(struct inode *dir, struct dentry *entry)
struct fuse_conn *fc = get_fuse_conn(dir);
FUSE_ARGS(args);
args.in.h.opcode = FUSE_RMDIR;
args.in.h.nodeid = get_node_id(dir);
args.in.numargs = 1;
args.in.args[0].size = entry->d_name.len + 1;
args.in.args[0].value = entry->d_name.name;
args.opcode = FUSE_RMDIR;
args.nodeid = get_node_id(dir);
args.in_numargs = 1;
args.in_args[0].size = entry->d_name.len + 1;
args.in_args[0].value = entry->d_name.name;
err = fuse_simple_request(fc, &args);
if (!err) {
clear_nlink(d_inode(entry));
@ -711,15 +758,15 @@ static int fuse_rename_common(struct inode *olddir, struct dentry *oldent,
memset(&inarg, 0, argsize);
inarg.newdir = get_node_id(newdir);
inarg.flags = flags;
args.in.h.opcode = opcode;
args.in.h.nodeid = get_node_id(olddir);
args.in.numargs = 3;
args.in.args[0].size = argsize;
args.in.args[0].value = &inarg;
args.in.args[1].size = oldent->d_name.len + 1;
args.in.args[1].value = oldent->d_name.name;
args.in.args[2].size = newent->d_name.len + 1;
args.in.args[2].value = newent->d_name.name;
args.opcode = opcode;
args.nodeid = get_node_id(olddir);
args.in_numargs = 3;
args.in_args[0].size = argsize;
args.in_args[0].value = &inarg;
args.in_args[1].size = oldent->d_name.len + 1;
args.in_args[1].value = oldent->d_name.name;
args.in_args[2].size = newent->d_name.len + 1;
args.in_args[2].value = newent->d_name.name;
err = fuse_simple_request(fc, &args);
if (!err) {
/* ctime changes */
@ -796,12 +843,12 @@ static int fuse_link(struct dentry *entry, struct inode *newdir,
memset(&inarg, 0, sizeof(inarg));
inarg.oldnodeid = get_node_id(inode);
args.in.h.opcode = FUSE_LINK;
args.in.numargs = 2;
args.in.args[0].size = sizeof(inarg);
args.in.args[0].value = &inarg;
args.in.args[1].size = newent->d_name.len + 1;
args.in.args[1].value = newent->d_name.name;
args.opcode = FUSE_LINK;
args.in_numargs = 2;
args.in_args[0].size = sizeof(inarg);
args.in_args[0].value = &inarg;
args.in_args[1].size = newent->d_name.len + 1;
args.in_args[1].value = newent->d_name.name;
err = create_new_entry(fc, &args, newdir, newent, inode->i_mode);
/* Contrary to "normal" filesystems it can happen that link
makes two "logical" inodes point to the same "physical"
@ -884,14 +931,14 @@ static int fuse_do_getattr(struct inode *inode, struct kstat *stat,
inarg.getattr_flags |= FUSE_GETATTR_FH;
inarg.fh = ff->fh;
}
args.in.h.opcode = FUSE_GETATTR;
args.in.h.nodeid = get_node_id(inode);
args.in.numargs = 1;
args.in.args[0].size = sizeof(inarg);
args.in.args[0].value = &inarg;
args.out.numargs = 1;
args.out.args[0].size = sizeof(outarg);
args.out.args[0].value = &outarg;
args.opcode = FUSE_GETATTR;
args.nodeid = get_node_id(inode);
args.in_numargs = 1;
args.in_args[0].size = sizeof(inarg);
args.in_args[0].value = &inarg;
args.out_numargs = 1;
args.out_args[0].size = sizeof(outarg);
args.out_args[0].value = &outarg;
err = fuse_simple_request(fc, &args);
if (!err) {
if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
@ -1056,11 +1103,11 @@ static int fuse_access(struct inode *inode, int mask)
memset(&inarg, 0, sizeof(inarg));
inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC);
args.in.h.opcode = FUSE_ACCESS;
args.in.h.nodeid = get_node_id(inode);
args.in.numargs = 1;
args.in.args[0].size = sizeof(inarg);
args.in.args[0].value = &inarg;
args.opcode = FUSE_ACCESS;
args.nodeid = get_node_id(inode);
args.in_numargs = 1;
args.in_args[0].size = sizeof(inarg);
args.in_args[0].value = &inarg;
err = fuse_simple_request(fc, &args);
if (err == -ENOSYS) {
fc->no_access = 1;
@ -1152,38 +1199,36 @@ static int fuse_permission(struct inode *inode, int mask)
static int fuse_readlink_page(struct inode *inode, struct page *page)
{
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_req *req;
int err;
struct fuse_page_desc desc = { .length = PAGE_SIZE - 1 };
struct fuse_args_pages ap = {
.num_pages = 1,
.pages = &page,
.descs = &desc,
};
char *link;
ssize_t res;
req = fuse_get_req(fc, 1);
if (IS_ERR(req))
return PTR_ERR(req);
ap.args.opcode = FUSE_READLINK;
ap.args.nodeid = get_node_id(inode);
ap.args.out_pages = true;
ap.args.out_argvar = true;
ap.args.page_zeroing = true;
ap.args.out_numargs = 1;
ap.args.out_args[0].size = desc.length;
res = fuse_simple_request(fc, &ap.args);
req->out.page_zeroing = 1;
req->out.argpages = 1;
req->num_pages = 1;
req->pages[0] = page;
req->page_descs[0].length = PAGE_SIZE - 1;
req->in.h.opcode = FUSE_READLINK;
req->in.h.nodeid = get_node_id(inode);
req->out.argvar = 1;
req->out.numargs = 1;
req->out.args[0].size = PAGE_SIZE - 1;
fuse_request_send(fc, req);
err = req->out.h.error;
if (!err) {
char *link = page_address(page);
size_t len = req->out.args[0].size;
BUG_ON(len >= PAGE_SIZE);
link[len] = '\0';
}
fuse_put_request(fc, req);
fuse_invalidate_atime(inode);
return err;
if (res < 0)
return res;
if (WARN_ON(res >= PAGE_SIZE))
return -EIO;
link = page_address(page);
link[res] = '\0';
return 0;
}
static const char *fuse_get_link(struct dentry *dentry, struct inode *inode,
@ -1383,14 +1428,14 @@ static void fuse_setattr_fill(struct fuse_conn *fc, struct fuse_args *args,
struct fuse_setattr_in *inarg_p,
struct fuse_attr_out *outarg_p)
{
args->in.h.opcode = FUSE_SETATTR;
args->in.h.nodeid = get_node_id(inode);
args->in.numargs = 1;
args->in.args[0].size = sizeof(*inarg_p);
args->in.args[0].value = inarg_p;
args->out.numargs = 1;
args->out.args[0].size = sizeof(*outarg_p);
args->out.args[0].value = outarg_p;
args->opcode = FUSE_SETATTR;
args->nodeid = get_node_id(inode);
args->in_numargs = 1;
args->in_args[0].size = sizeof(*inarg_p);
args->in_args[0].value = inarg_p;
args->out_numargs = 1;
args->out_args[0].size = sizeof(*outarg_p);
args->out_args[0].value = outarg_p;
}
/*

1233
fs/fuse/file.c
View File

File diff suppressed because it is too large Load Diff

358
fs/fuse/fuse_i.h
View File

@ -47,9 +47,6 @@
/** Number of dentries for each connection in the control filesystem */
#define FUSE_CTL_NUM_DENTRIES 5
/** Number of page pointers embedded in fuse_req */
#define FUSE_REQ_INLINE_PAGES 1
/** List of active connections */
extern struct list_head fuse_conn_list;
@ -164,17 +161,15 @@ enum {
};
struct fuse_conn;
struct fuse_release_args;
/** FUSE specific file data */
struct fuse_file {
/** Fuse connection for this file */
struct fuse_conn *fc;
/*
* Request reserved for flush and release.
* Modified under relative fuse_inode::lock.
*/
struct fuse_req *reserved_req;
/* Argument space reserved for release */
struct fuse_release_args *release_args;
/** Kernel file handle guaranteed to be unique */
u64 kh;
@ -229,57 +224,12 @@ struct fuse_in_arg {
const void *value;
};
/** The request input */
struct fuse_in {
/** The request header */
struct fuse_in_header h;
/** True if the data for the last argument is in req->pages */
unsigned argpages:1;
/** Number of arguments */
unsigned numargs;
/** Array of arguments */
struct fuse_in_arg args[3];
};
/** One output argument of a request */
struct fuse_arg {
unsigned size;
void *value;
};
/** The request output */
struct fuse_out {
/** Header returned from userspace */
struct fuse_out_header h;
/*
* The following bitfields are not changed during the request
* processing
*/
/** Last argument is variable length (can be shorter than
arg->size) */
unsigned argvar:1;
/** Last argument is a list of pages to copy data to */
unsigned argpages:1;
/** Zero partially or not copied pages */
unsigned page_zeroing:1;
/** Pages may be replaced with new ones */
unsigned page_replace:1;
/** Number or arguments */
unsigned numargs;
/** Array of arguments */
struct fuse_arg args[2];
};
/** FUSE page descriptor */
struct fuse_page_desc {
unsigned int length;
@ -287,20 +237,28 @@ struct fuse_page_desc {
};
struct fuse_args {
struct {
struct {
uint32_t opcode;
uint64_t nodeid;
} h;
unsigned numargs;
struct fuse_in_arg args[3];
uint64_t nodeid;
uint32_t opcode;
unsigned short in_numargs;
unsigned short out_numargs;
bool force:1;
bool noreply:1;
bool nocreds:1;
bool in_pages:1;
bool out_pages:1;
bool out_argvar:1;
bool page_zeroing:1;
bool page_replace:1;
struct fuse_in_arg in_args[3];
struct fuse_arg out_args[2];
void (*end)(struct fuse_conn *fc, struct fuse_args *args, int error);
};
} in;
struct {
unsigned argvar:1;
unsigned numargs;
struct fuse_arg args[2];
} out;
struct fuse_args_pages {
struct fuse_args args;
struct page **pages;
struct fuse_page_desc *descs;
unsigned int num_pages;
};
#define FUSE_ARGS(args) struct fuse_args args = {}
@ -373,83 +331,70 @@ struct fuse_req {
/** Entry on the interrupts list */
struct list_head intr_entry;
/* Input/output arguments */
struct fuse_args *args;
/** refcount */
refcount_t count;
/* Request flags, updated with test/set/clear_bit() */
unsigned long flags;
/** The request input */
struct fuse_in in;
/* The request input header */
struct {
struct fuse_in_header h;
} in;
/** The request output */
struct fuse_out out;
/* The request output header */
struct {
struct fuse_out_header h;
} out;
/** Used to wake up the task waiting for completion of request*/
wait_queue_head_t waitq;
/** Data for asynchronous requests */
union {
struct {
struct fuse_release_in in;
struct inode *inode;
} release;
struct fuse_init_in init_in;
struct fuse_init_out init_out;
struct cuse_init_in cuse_init_in;
struct {
struct fuse_read_in in;
u64 attr_ver;
} read;
struct {
struct fuse_write_in in;
struct fuse_write_out out;
struct fuse_req *next;
} write;
struct fuse_notify_retrieve_in retrieve_in;
} misc;
/** page vector */
struct page **pages;
/** page-descriptor vector */
struct fuse_page_desc *page_descs;
/** size of the 'pages' array */
unsigned max_pages;
/** inline page vector */
struct page *inline_pages[FUSE_REQ_INLINE_PAGES];
/** inline page-descriptor vector */
struct fuse_page_desc inline_page_descs[FUSE_REQ_INLINE_PAGES];
/** number of pages in vector */
unsigned num_pages;
/** File used in the request (or NULL) */
struct fuse_file *ff;
/** Inode used in the request or NULL */
struct inode *inode;
/** AIO control block */
struct fuse_io_priv *io;
/** Link on fi->writepages */
struct list_head writepages_entry;
/** Request completion callback */
void (*end)(struct fuse_conn *, struct fuse_req *);
/** Request is stolen from fuse_file->reserved_req */
struct file *stolen_file;
};
struct fuse_iqueue;
/**
* Input queue callbacks
*
* Input queue signalling is device-specific. For example, the /dev/fuse file
* uses fiq->waitq and fasync to wake processes that are waiting on queue
* readiness. These callbacks allow other device types to respond to input
* queue activity.
*/
struct fuse_iqueue_ops {
/**
* Signal that a forget has been queued
*/
void (*wake_forget_and_unlock)(struct fuse_iqueue *fiq)
__releases(fiq->lock);
/**
* Signal that an INTERRUPT request has been queued
*/
void (*wake_interrupt_and_unlock)(struct fuse_iqueue *fiq)
__releases(fiq->lock);
/**
* Signal that a request has been queued
*/
void (*wake_pending_and_unlock)(struct fuse_iqueue *fiq)
__releases(fiq->lock);
};
/** /dev/fuse input queue operations */
extern const struct fuse_iqueue_ops fuse_dev_fiq_ops;
struct fuse_iqueue {
/** Connection established */
unsigned connected;
/** Lock protecting accesses to members of this structure */
spinlock_t lock;
/** Readers of the connection are waiting on this */
wait_queue_head_t waitq;
@ -471,6 +416,12 @@ struct fuse_iqueue {
/** O_ASYNC requests */
struct fasync_struct *fasync;
/** Device-specific callbacks */
const struct fuse_iqueue_ops *ops;
/** Device-specific state */
void *priv;
};
#define FUSE_PQ_HASH_BITS 8
@ -504,6 +455,29 @@ struct fuse_dev {
struct list_head entry;
};
struct fuse_fs_context {
int fd;
unsigned int rootmode;
kuid_t user_id;
kgid_t group_id;
bool is_bdev:1;
bool fd_present:1;
bool rootmode_present:1;
bool user_id_present:1;
bool group_id_present:1;
bool default_permissions:1;
bool allow_other:1;
bool destroy:1;
bool no_control:1;
bool no_force_umount:1;
unsigned int max_read;
unsigned int blksize;
const char *subtype;
/* fuse_dev pointer to fill in, should contain NULL on entry */
void **fudptr;
};
/**
* A Fuse connection.
*
@ -584,9 +558,6 @@ struct fuse_conn {
/** waitq for blocked connection */
wait_queue_head_t blocked_waitq;
/** waitq for reserved requests */
wait_queue_head_t reserved_req_waitq;
/** Connection established, cleared on umount, connection
abort and device release */
unsigned connected;
@ -721,6 +692,18 @@ struct fuse_conn {
/** Does the filesystem support copy_file_range? */
unsigned no_copy_file_range:1;
/* Send DESTROY request */
unsigned int destroy:1;
/* Delete dentries that have gone stale */
unsigned int delete_stale:1;
/** Do not create entry in fusectl fs */
unsigned int no_control:1;
/** Do not allow MNT_FORCE umount */
unsigned int no_force_umount:1;
/** The number of requests waiting for completion */
atomic_t num_waiting;
@ -742,9 +725,6 @@ struct fuse_conn {
/** Key for lock owner ID scrambling */
u32 scramble_key[4];
/** Reserved request for the DESTROY message */
struct fuse_req *destroy_req;
/** Version counter for attribute changes */
atomic64_t attr_version;
@ -820,14 +800,32 @@ void fuse_queue_forget(struct fuse_conn *fc, struct fuse_forget_link *forget,
struct fuse_forget_link *fuse_alloc_forget(void);
/* Used by READDIRPLUS */
void fuse_force_forget(struct file *file, u64 nodeid);
struct fuse_forget_link *fuse_dequeue_forget(struct fuse_iqueue *fiq,
unsigned int max,
unsigned int *countp);
/**
/*
* Initialize READ or READDIR request
*/
void fuse_read_fill(struct fuse_req *req, struct file *file,
loff_t pos, size_t count, int opcode);
struct fuse_io_args {
union {
struct {
struct fuse_read_in in;
u64 attr_ver;
} read;
struct {
struct fuse_write_in in;
struct fuse_write_out out;
} write;
};
struct fuse_args_pages ap;
struct fuse_io_priv *io;
struct fuse_file *ff;
};
void fuse_read_args_fill(struct fuse_io_args *ia, struct file *file, loff_t pos,
size_t count, int opcode);
/**
* Send OPEN or OPENDIR request
@ -899,62 +897,17 @@ void fuse_dev_cleanup(void);
int fuse_ctl_init(void);
void __exit fuse_ctl_cleanup(void);
/**
* Allocate a request
*/
struct fuse_req *fuse_request_alloc(unsigned npages);
struct fuse_req *fuse_request_alloc_nofs(unsigned npages);
bool fuse_req_realloc_pages(struct fuse_conn *fc, struct fuse_req *req,
gfp_t flags);
/**
* Free a request
*/
void fuse_request_free(struct fuse_req *req);
/**
* Get a request, may fail with -ENOMEM,
* caller should specify # elements in req->pages[] explicitly
*/
struct fuse_req *fuse_get_req(struct fuse_conn *fc, unsigned npages);
struct fuse_req *fuse_get_req_for_background(struct fuse_conn *fc,
unsigned npages);
/*
* Increment reference count on request
*/
void __fuse_get_request(struct fuse_req *req);
/**
* Gets a requests for a file operation, always succeeds
*/
struct fuse_req *fuse_get_req_nofail_nopages(struct fuse_conn *fc,
struct file *file);
/**
* Decrement reference count of a request. If count goes to zero free
* the request.
*/
void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req);
/**
* Send a request (synchronous)
*/
void fuse_request_send(struct fuse_conn *fc, struct fuse_req *req);
/**
* Simple request sending that does request allocation and freeing
*/
ssize_t fuse_simple_request(struct fuse_conn *fc, struct fuse_args *args);
int fuse_simple_background(struct fuse_conn *fc, struct fuse_args *args,
gfp_t gfp_flags);
/**
* Send a request in the background
* End a finished request
*/
void fuse_request_send_background(struct fuse_conn *fc, struct fuse_req *req);
bool fuse_request_queue_background(struct fuse_conn *fc, struct fuse_req *req);
void fuse_request_end(struct fuse_conn *fc, struct fuse_req *req);
/* Abort all requests */
void fuse_abort_conn(struct fuse_conn *fc);
@ -980,15 +933,33 @@ struct fuse_conn *fuse_conn_get(struct fuse_conn *fc);
/**
* Initialize fuse_conn
*/
void fuse_conn_init(struct fuse_conn *fc, struct user_namespace *user_ns);
void fuse_conn_init(struct fuse_conn *fc, struct user_namespace *user_ns,
const struct fuse_iqueue_ops *fiq_ops, void *fiq_priv);
/**
* Release reference to fuse_conn
*/
void fuse_conn_put(struct fuse_conn *fc);
struct fuse_dev *fuse_dev_alloc(struct fuse_conn *fc);
struct fuse_dev *fuse_dev_alloc_install(struct fuse_conn *fc);
struct fuse_dev *fuse_dev_alloc(void);
void fuse_dev_install(struct fuse_dev *fud, struct fuse_conn *fc);
void fuse_dev_free(struct fuse_dev *fud);
void fuse_send_init(struct fuse_conn *fc);
/**
* Fill in superblock and initialize fuse connection
* @sb: partially-initialized superblock to fill in
* @ctx: mount context
*/
int fuse_fill_super_common(struct super_block *sb, struct fuse_fs_context *ctx);
/**
* Disassociate fuse connection from superblock and kill the superblock
*
* Calls kill_anon_super(), do not use with bdev mounts.
*/
void fuse_kill_sb_anon(struct super_block *sb);
/**
* Add connection to control filesystem
@ -1093,4 +1064,15 @@ int fuse_set_acl(struct inode *inode, struct posix_acl *acl, int type);
/* readdir.c */
int fuse_readdir(struct file *file, struct dir_context *ctx);
/**
* Return the number of bytes in an arguments list
*/
unsigned int fuse_len_args(unsigned int numargs, struct fuse_arg *args);
/**
* Get the next unique ID for a request
*/
u64 fuse_get_unique(struct fuse_iqueue *fiq);
void fuse_free_conn(struct fuse_conn *fc);
#endif /* _FS_FUSE_I_H */

563
fs/fuse/inode.c
View File

@ -15,7 +15,8 @@
#include <linux/init.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/parser.h>
#include <linux/fs_context.h>
#include <linux/fs_parser.h>
#include <linux/statfs.h>
#include <linux/random.h>
#include <linux/sched.h>
@ -59,24 +60,13 @@ MODULE_PARM_DESC(max_user_congthresh,
/** Congestion starts at 75% of maximum */
#define FUSE_DEFAULT_CONGESTION_THRESHOLD (FUSE_DEFAULT_MAX_BACKGROUND * 3 / 4)
struct fuse_mount_data {
int fd;
unsigned rootmode;
kuid_t user_id;
kgid_t group_id;
unsigned fd_present:1;
unsigned rootmode_present:1;
unsigned user_id_present:1;
unsigned group_id_present:1;
unsigned default_permissions:1;
unsigned allow_other:1;
unsigned max_read;
unsigned blksize;
};
#ifdef CONFIG_BLOCK
static struct file_system_type fuseblk_fs_type;
#endif
struct fuse_forget_link *fuse_alloc_forget(void)
{
return kzalloc(sizeof(struct fuse_forget_link), GFP_KERNEL);
return kzalloc(sizeof(struct fuse_forget_link), GFP_KERNEL_ACCOUNT);
}
static struct inode *fuse_alloc_inode(struct super_block *sb)
@ -374,19 +364,21 @@ void fuse_unlock_inode(struct inode *inode, bool locked)
static void fuse_umount_begin(struct super_block *sb)
{
fuse_abort_conn(get_fuse_conn_super(sb));
struct fuse_conn *fc = get_fuse_conn_super(sb);
if (!fc->no_force_umount)
fuse_abort_conn(fc);
}
static void fuse_send_destroy(struct fuse_conn *fc)
{
struct fuse_req *req = fc->destroy_req;
if (req && fc->conn_init) {
fc->destroy_req = NULL;
req->in.h.opcode = FUSE_DESTROY;
__set_bit(FR_FORCE, &req->flags);
__clear_bit(FR_BACKGROUND, &req->flags);
fuse_request_send(fc, req);
fuse_put_request(fc, req);
if (fc->conn_init) {
FUSE_ARGS(args);
args.opcode = FUSE_DESTROY;
args.force = true;
args.nocreds = true;
fuse_simple_request(fc, &args);
}
}
@ -430,12 +422,12 @@ static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf)
}
memset(&outarg, 0, sizeof(outarg));
args.in.numargs = 0;
args.in.h.opcode = FUSE_STATFS;
args.in.h.nodeid = get_node_id(d_inode(dentry));
args.out.numargs = 1;
args.out.args[0].size = sizeof(outarg);
args.out.args[0].value = &outarg;
args.in_numargs = 0;
args.opcode = FUSE_STATFS;
args.nodeid = get_node_id(d_inode(dentry));
args.out_numargs = 1;
args.out_args[0].size = sizeof(outarg);
args.out_args[0].value = &outarg;
err = fuse_simple_request(fc, &args);
if (!err)
convert_fuse_statfs(buf, &outarg.st);
@ -443,6 +435,8 @@ static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf)
}
enum {
OPT_SOURCE,
OPT_SUBTYPE,
OPT_FD,
OPT_ROOTMODE,
OPT_USER_ID,
@ -454,111 +448,109 @@ enum {
OPT_ERR
};
static const match_table_t tokens = {
{OPT_FD, "fd=%u"},
{OPT_ROOTMODE, "rootmode=%o"},
{OPT_USER_ID, "user_id=%u"},
{OPT_GROUP_ID, "group_id=%u"},
{OPT_DEFAULT_PERMISSIONS, "default_permissions"},
{OPT_ALLOW_OTHER, "allow_other"},
{OPT_MAX_READ, "max_read=%u"},
{OPT_BLKSIZE, "blksize=%u"},
{OPT_ERR, NULL}
static const struct fs_parameter_spec fuse_param_specs[] = {
fsparam_string ("source", OPT_SOURCE),
fsparam_u32 ("fd", OPT_FD),
fsparam_u32oct ("rootmode", OPT_ROOTMODE),
fsparam_u32 ("user_id", OPT_USER_ID),
fsparam_u32 ("group_id", OPT_GROUP_ID),
fsparam_flag ("default_permissions", OPT_DEFAULT_PERMISSIONS),
fsparam_flag ("allow_other", OPT_ALLOW_OTHER),
fsparam_u32 ("max_read", OPT_MAX_READ),
fsparam_u32 ("blksize", OPT_BLKSIZE),
fsparam_string ("subtype", OPT_SUBTYPE),
{}
};
static int fuse_match_uint(substring_t *s, unsigned int *res)
static const struct fs_parameter_description fuse_fs_parameters = {
.name = "fuse",
.specs = fuse_param_specs,
};
static int fuse_parse_param(struct fs_context *fc, struct fs_parameter *param)
{
int err = -ENOMEM;
char *buf = match_strdup(s);
if (buf) {
err = kstrtouint(buf, 10, res);
kfree(buf);
}
return err;
}
struct fs_parse_result result;
struct fuse_fs_context *ctx = fc->fs_private;
int opt;
static int parse_fuse_opt(char *opt, struct fuse_mount_data *d, int is_bdev,
struct user_namespace *user_ns)
{
char *p;
memset(d, 0, sizeof(struct fuse_mount_data));
d->max_read = ~0;
d->blksize = FUSE_DEFAULT_BLKSIZE;
opt = fs_parse(fc, &fuse_fs_parameters, param, &result);
if (opt < 0)
return opt;
while ((p = strsep(&opt, ",")) != NULL) {
int token;
int value;
unsigned uv;
substring_t args[MAX_OPT_ARGS];
if (!*p)
continue;
switch (opt) {
case OPT_SOURCE:
if (fc->source)
return invalf(fc, "fuse: Multiple sources specified");
fc->source = param->string;
param->string = NULL;
break;
token = match_token(p, tokens, args);
switch (token) {
case OPT_FD:
if (match_int(&args[0], &value))
return 0;
d->fd = value;
d->fd_present = 1;
break;
case OPT_ROOTMODE:
if (match_octal(&args[0], &value))
return 0;
if (!fuse_valid_type(value))
return 0;
d->rootmode = value;
d->rootmode_present = 1;
break;
case OPT_USER_ID:
if (fuse_match_uint(&args[0], &uv))
return 0;
d->user_id = make_kuid(user_ns, uv);
if (!uid_valid(d->user_id))
return 0;
d->user_id_present = 1;
break;
case OPT_GROUP_ID:
if (fuse_match_uint(&args[0], &uv))
return 0;
d->group_id = make_kgid(user_ns, uv);
if (!gid_valid(d->group_id))
return 0;
d->group_id_present = 1;
break;
case OPT_DEFAULT_PERMISSIONS:
d->default_permissions = 1;
break;
case OPT_ALLOW_OTHER:
d->allow_other = 1;
break;
case OPT_MAX_READ:
if (match_int(&args[0], &value))
return 0;
d->max_read = value;
break;
case OPT_BLKSIZE:
if (!is_bdev || match_int(&args[0], &value))
return 0;
d->blksize = value;
break;
default:
return 0;
}
}
if (!d->fd_present || !d->rootmode_present ||
!d->user_id_present || !d->group_id_present)
case OPT_SUBTYPE:
if (ctx->subtype)
return invalf(fc, "fuse: Multiple subtypes specified");
ctx->subtype = param->string;
param->string = NULL;
return 0;
return 1;
case OPT_FD:
ctx->fd = result.uint_32;
ctx->fd_present = 1;
break;
case OPT_ROOTMODE:
if (!fuse_valid_type(result.uint_32))
return invalf(fc, "fuse: Invalid rootmode");
ctx->rootmode = result.uint_32;
ctx->rootmode_present = 1;
break;
case OPT_USER_ID:
ctx->user_id = make_kuid(fc->user_ns, result.uint_32);
if (!uid_valid(ctx->user_id))
return invalf(fc, "fuse: Invalid user_id");
ctx->user_id_present = 1;
break;
case OPT_GROUP_ID:
ctx->group_id = make_kgid(fc->user_ns, result.uint_32);
if (!gid_valid(ctx->group_id))
return invalf(fc, "fuse: Invalid group_id");
ctx->group_id_present = 1;
break;
case OPT_DEFAULT_PERMISSIONS:
ctx->default_permissions = 1;
break;
case OPT_ALLOW_OTHER:
ctx->allow_other = 1;
break;
case OPT_MAX_READ:
ctx->max_read = result.uint_32;
break;
case OPT_BLKSIZE:
if (!ctx->is_bdev)
return invalf(fc, "fuse: blksize only supported for fuseblk");
ctx->blksize = result.uint_32;
break;
default:
return -EINVAL;
}
return 0;
}
static void fuse_free_fc(struct fs_context *fc)
{
struct fuse_fs_context *ctx = fc->fs_private;
if (ctx) {
kfree(ctx->subtype);
kfree(ctx);
}
}
static int fuse_show_options(struct seq_file *m, struct dentry *root)
@ -579,14 +571,19 @@ static int fuse_show_options(struct seq_file *m, struct dentry *root)
return 0;
}
static void fuse_iqueue_init(struct fuse_iqueue *fiq)
static void fuse_iqueue_init(struct fuse_iqueue *fiq,
const struct fuse_iqueue_ops *ops,
void *priv)
{
memset(fiq, 0, sizeof(struct fuse_iqueue));
spin_lock_init(&fiq->lock);
init_waitqueue_head(&fiq->waitq);
INIT_LIST_HEAD(&fiq->pending);
INIT_LIST_HEAD(&fiq->interrupts);
fiq->forget_list_tail = &fiq->forget_list_head;
fiq->connected = 1;
fiq->ops = ops;
fiq->priv = priv;
}
static void fuse_pqueue_init(struct fuse_pqueue *fpq)
@ -600,7 +597,8 @@ static void fuse_pqueue_init(struct fuse_pqueue *fpq)
fpq->connected = 1;
}
void fuse_conn_init(struct fuse_conn *fc, struct user_namespace *user_ns)
void fuse_conn_init(struct fuse_conn *fc, struct user_namespace *user_ns,
const struct fuse_iqueue_ops *fiq_ops, void *fiq_priv)
{
memset(fc, 0, sizeof(*fc));
spin_lock_init(&fc->lock);
@ -609,8 +607,7 @@ void fuse_conn_init(struct fuse_conn *fc, struct user_namespace *user_ns)
refcount_set(&fc->count, 1);
atomic_set(&fc->dev_count, 1);
init_waitqueue_head(&fc->blocked_waitq);
init_waitqueue_head(&fc->reserved_req_waitq);
fuse_iqueue_init(&fc->iq);
fuse_iqueue_init(&fc->iq, fiq_ops, fiq_priv);
INIT_LIST_HEAD(&fc->bg_queue);
INIT_LIST_HEAD(&fc->entry);
INIT_LIST_HEAD(&fc->devices);
@ -633,8 +630,6 @@ EXPORT_SYMBOL_GPL(fuse_conn_init);
void fuse_conn_put(struct fuse_conn *fc)
{
if (refcount_dec_and_test(&fc->count)) {
if (fc->destroy_req)
fuse_request_free(fc->destroy_req);
put_pid_ns(fc->pid_ns);
put_user_ns(fc->user_ns);
fc->release(fc);
@ -822,9 +817,12 @@ static const struct super_operations fuse_super_operations = {
static void sanitize_global_limit(unsigned *limit)
{
/*
* The default maximum number of async requests is calculated to consume
* 1/2^13 of the total memory, assuming 392 bytes per request.
*/
if (*limit == 0)
*limit = ((totalram_pages() << PAGE_SHIFT) >> 13) /
sizeof(struct fuse_req);
*limit = ((totalram_pages() << PAGE_SHIFT) >> 13) / 392;
if (*limit >= 1 << 16)
*limit = (1 << 16) - 1;
@ -870,11 +868,19 @@ static void process_init_limits(struct fuse_conn *fc, struct fuse_init_out *arg)
spin_unlock(&fc->bg_lock);
}
static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
{
struct fuse_init_out *arg = &req->misc.init_out;
struct fuse_init_args {
struct fuse_args args;
struct fuse_init_in in;
struct fuse_init_out out;
};
if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION)
static void process_init_reply(struct fuse_conn *fc, struct fuse_args *args,
int error)
{
struct fuse_init_args *ia = container_of(args, typeof(*ia), args);
struct fuse_init_out *arg = &ia->out;
if (error || arg->major != FUSE_KERNEL_VERSION)
fc->conn_error = 1;
else {
unsigned long ra_pages;
@ -951,18 +957,23 @@ static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
fc->max_write = max_t(unsigned, 4096, fc->max_write);
fc->conn_init = 1;
}
kfree(ia);
fuse_set_initialized(fc);
wake_up_all(&fc->blocked_waitq);
}
static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
void fuse_send_init(struct fuse_conn *fc)
{
struct fuse_init_in *arg = &req->misc.init_in;
struct fuse_init_args *ia;
arg->major = FUSE_KERNEL_VERSION;
arg->minor = FUSE_KERNEL_MINOR_VERSION;
arg->max_readahead = fc->sb->s_bdi->ra_pages * PAGE_SIZE;
arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC |
ia = kzalloc(sizeof(*ia), GFP_KERNEL | __GFP_NOFAIL);
ia->in.major = FUSE_KERNEL_VERSION;
ia->in.minor = FUSE_KERNEL_MINOR_VERSION;
ia->in.max_readahead = fc->sb->s_bdi->ra_pages * PAGE_SIZE;
ia->in.flags |=
FUSE_ASYNC_READ | FUSE_POSIX_LOCKS | FUSE_ATOMIC_O_TRUNC |
FUSE_EXPORT_SUPPORT | FUSE_BIG_WRITES | FUSE_DONT_MASK |
FUSE_SPLICE_WRITE | FUSE_SPLICE_MOVE | FUSE_SPLICE_READ |
FUSE_FLOCK_LOCKS | FUSE_HAS_IOCTL_DIR | FUSE_AUTO_INVAL_DATA |
@ -971,26 +982,32 @@ static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
FUSE_PARALLEL_DIROPS | FUSE_HANDLE_KILLPRIV | FUSE_POSIX_ACL |
FUSE_ABORT_ERROR | FUSE_MAX_PAGES | FUSE_CACHE_SYMLINKS |
FUSE_NO_OPENDIR_SUPPORT | FUSE_EXPLICIT_INVAL_DATA;
req->in.h.opcode = FUSE_INIT;
req->in.numargs = 1;
req->in.args[0].size = sizeof(*arg);
req->in.args[0].value = arg;
req->out.numargs = 1;
ia->args.opcode = FUSE_INIT;
ia->args.in_numargs = 1;
ia->args.in_args[0].size = sizeof(ia->in);
ia->args.in_args[0].value = &ia->in;
ia->args.out_numargs = 1;
/* Variable length argument used for backward compatibility
with interface version < 7.5. Rest of init_out is zeroed
by do_get_request(), so a short reply is not a problem */
req->out.argvar = 1;
req->out.args[0].size = sizeof(struct fuse_init_out);
req->out.args[0].value = &req->misc.init_out;
req->end = process_init_reply;
fuse_request_send_background(fc, req);
}
ia->args.out_argvar = 1;
ia->args.out_args[0].size = sizeof(ia->out);
ia->args.out_args[0].value = &ia->out;
ia->args.force = true;
ia->args.nocreds = true;
ia->args.end = process_init_reply;
static void fuse_free_conn(struct fuse_conn *fc)
if (fuse_simple_background(fc, &ia->args, GFP_KERNEL) != 0)
process_init_reply(fc, &ia->args, -ENOTCONN);
}
EXPORT_SYMBOL_GPL(fuse_send_init);
void fuse_free_conn(struct fuse_conn *fc)
{
WARN_ON(!list_empty(&fc->devices));
kfree_rcu(fc, rcu);
}
EXPORT_SYMBOL_GPL(fuse_free_conn);
static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb)
{
@ -1032,7 +1049,7 @@ static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb)
return 0;
}
struct fuse_dev *fuse_dev_alloc(struct fuse_conn *fc)
struct fuse_dev *fuse_dev_alloc(void)
{
struct fuse_dev *fud;
struct list_head *pq;
@ -1048,17 +1065,34 @@ struct fuse_dev *fuse_dev_alloc(struct fuse_conn *fc)
}
fud->pq.processing = pq;
fud->fc = fuse_conn_get(fc);
fuse_pqueue_init(&fud->pq);
spin_lock(&fc->lock);
list_add_tail(&fud->entry, &fc->devices);
spin_unlock(&fc->lock);
return fud;
}
EXPORT_SYMBOL_GPL(fuse_dev_alloc);
void fuse_dev_install(struct fuse_dev *fud, struct fuse_conn *fc)
{
fud->fc = fuse_conn_get(fc);
spin_lock(&fc->lock);
list_add_tail(&fud->entry, &fc->devices);
spin_unlock(&fc->lock);
}
EXPORT_SYMBOL_GPL(fuse_dev_install);
struct fuse_dev *fuse_dev_alloc_install(struct fuse_conn *fc)
{
struct fuse_dev *fud;
fud = fuse_dev_alloc();
if (!fud)
return NULL;
fuse_dev_install(fud, fc);
return fud;
}
EXPORT_SYMBOL_GPL(fuse_dev_alloc_install);
void fuse_dev_free(struct fuse_dev *fud)
{
struct fuse_conn *fc = fud->fc;
@ -1075,17 +1109,13 @@ void fuse_dev_free(struct fuse_dev *fud)
}
EXPORT_SYMBOL_GPL(fuse_dev_free);
static int fuse_fill_super(struct super_block *sb, void *data, int silent)
int fuse_fill_super_common(struct super_block *sb, struct fuse_fs_context *ctx)
{
struct fuse_dev *fud;
struct fuse_conn *fc;
struct fuse_conn *fc = get_fuse_conn_super(sb);
struct inode *root;
struct fuse_mount_data d;
struct file *file;
struct dentry *root_dentry;
struct fuse_req *init_req;
int err;
int is_bdev = sb->s_bdev != NULL;
err = -EINVAL;
if (sb->s_flags & SB_MANDLOCK)
@ -1093,19 +1123,19 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
sb->s_flags &= ~(SB_NOSEC | SB_I_VERSION);
if (!parse_fuse_opt(data, &d, is_bdev, sb->s_user_ns))
goto err;
if (is_bdev) {
if (ctx->is_bdev) {
#ifdef CONFIG_BLOCK
err = -EINVAL;
if (!sb_set_blocksize(sb, d.blksize))
if (!sb_set_blocksize(sb, ctx->blksize))
goto err;
#endif
} else {
sb->s_blocksize = PAGE_SIZE;
sb->s_blocksize_bits = PAGE_SHIFT;
}
sb->s_subtype = ctx->subtype;
ctx->subtype = NULL;
sb->s_magic = FUSE_SUPER_MAGIC;
sb->s_op = &fuse_super_operations;
sb->s_xattr = fuse_xattr_handlers;
@ -1116,19 +1146,6 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
if (sb->s_user_ns != &init_user_ns)
sb->s_iflags |= SB_I_UNTRUSTED_MOUNTER;
file = fget(d.fd);
err = -EINVAL;
if (!file)
goto err;
/*
* Require mount to happen from the same user namespace which
* opened /dev/fuse to prevent potential attacks.
*/
if (file->f_op != &fuse_dev_operations ||
file->f_cred->user_ns != sb->s_user_ns)
goto err_fput;
/*
* If we are not in the initial user namespace posix
* acls must be translated.
@ -1136,17 +1153,9 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
if (sb->s_user_ns != &init_user_ns)
sb->s_xattr = fuse_no_acl_xattr_handlers;
fc = kmalloc(sizeof(*fc), GFP_KERNEL);
err = -ENOMEM;
if (!fc)
goto err_fput;
fuse_conn_init(fc, sb->s_user_ns);
fc->release = fuse_free_conn;
fud = fuse_dev_alloc(fc);
fud = fuse_dev_alloc_install(fc);
if (!fud)
goto err_put_conn;
goto err;
fc->dev = sb->s_dev;
fc->sb = sb;
@ -1159,17 +1168,17 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
fc->dont_mask = 1;
sb->s_flags |= SB_POSIXACL;
fc->default_permissions = d.default_permissions;
fc->allow_other = d.allow_other;
fc->user_id = d.user_id;
fc->group_id = d.group_id;
fc->max_read = max_t(unsigned, 4096, d.max_read);
/* Used by get_root_inode() */
sb->s_fs_info = fc;
fc->default_permissions = ctx->default_permissions;
fc->allow_other = ctx->allow_other;
fc->user_id = ctx->user_id;
fc->group_id = ctx->group_id;
fc->max_read = max_t(unsigned, 4096, ctx->max_read);
fc->destroy = ctx->destroy;
fc->no_control = ctx->no_control;
fc->no_force_umount = ctx->no_force_umount;
err = -ENOMEM;
root = fuse_get_root_inode(sb, d.rootmode);
root = fuse_get_root_inode(sb, ctx->rootmode);
sb->s_d_op = &fuse_root_dentry_operations;
root_dentry = d_make_root(root);
if (!root_dentry)
@ -1177,20 +1186,9 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
/* Root dentry doesn't have .d_revalidate */
sb->s_d_op = &fuse_dentry_operations;
init_req = fuse_request_alloc(0);
if (!init_req)
goto err_put_root;
__set_bit(FR_BACKGROUND, &init_req->flags);
if (is_bdev) {
fc->destroy_req = fuse_request_alloc(0);
if (!fc->destroy_req)
goto err_free_init_req;
}
mutex_lock(&fuse_mutex);
err = -EINVAL;
if (file->private_data)
if (*ctx->fudptr)
goto err_unlock;
err = fuse_ctl_add_conn(fc);
@ -1199,27 +1197,62 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
list_add_tail(&fc->entry, &fuse_conn_list);
sb->s_root = root_dentry;
file->private_data = fud;
*ctx->fudptr = fud;
mutex_unlock(&fuse_mutex);
return 0;
err_unlock:
mutex_unlock(&fuse_mutex);
dput(root_dentry);
err_dev_free:
fuse_dev_free(fud);
err:
return err;
}
EXPORT_SYMBOL_GPL(fuse_fill_super_common);
static int fuse_fill_super(struct super_block *sb, struct fs_context *fsc)
{
struct fuse_fs_context *ctx = fsc->fs_private;
struct file *file;
int err;
struct fuse_conn *fc;
err = -EINVAL;
file = fget(ctx->fd);
if (!file)
goto err;
/*
* Require mount to happen from the same user namespace which
* opened /dev/fuse to prevent potential attacks.
*/
if ((file->f_op != &fuse_dev_operations) ||
(file->f_cred->user_ns != sb->s_user_ns))
goto err_fput;
ctx->fudptr = &file->private_data;
fc = kmalloc(sizeof(*fc), GFP_KERNEL);
err = -ENOMEM;
if (!fc)
goto err_fput;
fuse_conn_init(fc, sb->s_user_ns, &fuse_dev_fiq_ops, NULL);
fc->release = fuse_free_conn;
sb->s_fs_info = fc;
err = fuse_fill_super_common(sb, ctx);
if (err)
goto err_put_conn;
/*
* atomic_dec_and_test() in fput() provides the necessary
* memory barrier for file->private_data to be visible on all
* CPUs after this
*/
fput(file);
fuse_send_init(fc, init_req);
fuse_send_init(get_fuse_conn_super(sb));
return 0;
err_unlock:
mutex_unlock(&fuse_mutex);
err_free_init_req:
fuse_request_free(init_req);
err_put_root:
dput(root_dentry);
err_dev_free:
fuse_dev_free(fud);
err_put_conn:
fuse_conn_put(fc);
sb->s_fs_info = NULL;
@ -1229,11 +1262,52 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
return err;
}
static struct dentry *fuse_mount(struct file_system_type *fs_type,
int flags, const char *dev_name,
void *raw_data)
static int fuse_get_tree(struct fs_context *fc)
{
return mount_nodev(fs_type, flags, raw_data, fuse_fill_super);
struct fuse_fs_context *ctx = fc->fs_private;
if (!ctx->fd_present || !ctx->rootmode_present ||
!ctx->user_id_present || !ctx->group_id_present)
return -EINVAL;
#ifdef CONFIG_BLOCK
if (ctx->is_bdev)
return get_tree_bdev(fc, fuse_fill_super);
#endif
return get_tree_nodev(fc, fuse_fill_super);
}
static const struct fs_context_operations fuse_context_ops = {
.free = fuse_free_fc,
.parse_param = fuse_parse_param,
.get_tree = fuse_get_tree,
};
/*
* Set up the filesystem mount context.
*/
static int fuse_init_fs_context(struct fs_context *fc)
{
struct fuse_fs_context *ctx;
ctx = kzalloc(sizeof(struct fuse_fs_context), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
ctx->max_read = ~0;
ctx->blksize = FUSE_DEFAULT_BLKSIZE;
#ifdef CONFIG_BLOCK
if (fc->fs_type == &fuseblk_fs_type) {
ctx->is_bdev = true;
ctx->destroy = true;
}
#endif
fc->fs_private = ctx;
fc->ops = &fuse_context_ops;
return 0;
}
static void fuse_sb_destroy(struct super_block *sb)
@ -1241,7 +1315,8 @@ static void fuse_sb_destroy(struct super_block *sb)
struct fuse_conn *fc = get_fuse_conn_super(sb);
if (fc) {
fuse_send_destroy(fc);
if (fc->destroy)
fuse_send_destroy(fc);
fuse_abort_conn(fc);
fuse_wait_aborted(fc);
@ -1252,29 +1327,24 @@ static void fuse_sb_destroy(struct super_block *sb)
}
}
static void fuse_kill_sb_anon(struct super_block *sb)
void fuse_kill_sb_anon(struct super_block *sb)
{
fuse_sb_destroy(sb);
kill_anon_super(sb);
}
EXPORT_SYMBOL_GPL(fuse_kill_sb_anon);
static struct file_system_type fuse_fs_type = {
.owner = THIS_MODULE,
.name = "fuse",
.fs_flags = FS_HAS_SUBTYPE | FS_USERNS_MOUNT,
.mount = fuse_mount,
.init_fs_context = fuse_init_fs_context,
.parameters = &fuse_fs_parameters,
.kill_sb = fuse_kill_sb_anon,
};
MODULE_ALIAS_FS("fuse");
#ifdef CONFIG_BLOCK
static struct dentry *fuse_mount_blk(struct file_system_type *fs_type,
int flags, const char *dev_name,
void *raw_data)
{
return mount_bdev(fs_type, flags, dev_name, raw_data, fuse_fill_super);
}
static void fuse_kill_sb_blk(struct super_block *sb)
{
fuse_sb_destroy(sb);
@ -1284,7 +1354,8 @@ static void fuse_kill_sb_blk(struct super_block *sb)
static struct file_system_type fuseblk_fs_type = {
.owner = THIS_MODULE,
.name = "fuseblk",
.mount = fuse_mount_blk,
.init_fs_context = fuse_init_fs_context,
.parameters = &fuse_fs_parameters,
.kill_sb = fuse_kill_sb_blk,
.fs_flags = FS_REQUIRES_DEV | FS_HAS_SUBTYPE,
};

72
fs/fuse/readdir.c
View File

@ -249,6 +249,27 @@ retry:
return 0;
}
static void fuse_force_forget(struct file *file, u64 nodeid)
{
struct inode *inode = file_inode(file);
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_forget_in inarg;
FUSE_ARGS(args);
memset(&inarg, 0, sizeof(inarg));
inarg.nlookup = 1;
args.opcode = FUSE_FORGET;
args.nodeid = nodeid;
args.in_numargs = 1;
args.in_args[0].size = sizeof(inarg);
args.in_args[0].value = &inarg;
args.force = true;
args.noreply = true;
fuse_simple_request(fc, &args);
/* ignore errors */
}
static int parse_dirplusfile(char *buf, size_t nbytes, struct file *file,
struct dir_context *ctx, u64 attr_version)
{
@ -295,62 +316,55 @@ static int parse_dirplusfile(char *buf, size_t nbytes, struct file *file,
static int fuse_readdir_uncached(struct file *file, struct dir_context *ctx)
{
int plus, err;
size_t nbytes;
int plus;
ssize_t res;
struct page *page;
struct inode *inode = file_inode(file);
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_req *req;
struct fuse_io_args ia = {};
struct fuse_args_pages *ap = &ia.ap;
struct fuse_page_desc desc = { .length = PAGE_SIZE };
u64 attr_version = 0;
bool locked;
req = fuse_get_req(fc, 1);
if (IS_ERR(req))
return PTR_ERR(req);
page = alloc_page(GFP_KERNEL);
if (!page) {
fuse_put_request(fc, req);
if (!page)
return -ENOMEM;
}
plus = fuse_use_readdirplus(inode, ctx);
req->out.argpages = 1;
req->num_pages = 1;
req->pages[0] = page;
req->page_descs[0].length = PAGE_SIZE;
ap->args.out_pages = 1;
ap->num_pages = 1;
ap->pages = &page;
ap->descs = &desc;
if (plus) {
attr_version = fuse_get_attr_version(fc);
fuse_read_fill(req, file, ctx->pos, PAGE_SIZE,
FUSE_READDIRPLUS);
fuse_read_args_fill(&ia, file, ctx->pos, PAGE_SIZE,
FUSE_READDIRPLUS);
} else {
fuse_read_fill(req, file, ctx->pos, PAGE_SIZE,
FUSE_READDIR);
fuse_read_args_fill(&ia, file, ctx->pos, PAGE_SIZE,
FUSE_READDIR);
}
locked = fuse_lock_inode(inode);
fuse_request_send(fc, req);
res = fuse_simple_request(fc, &ap->args);
fuse_unlock_inode(inode, locked);
nbytes = req->out.args[0].size;
err = req->out.h.error;
fuse_put_request(fc, req);
if (!err) {
if (!nbytes) {
if (res >= 0) {
if (!res) {
struct fuse_file *ff = file->private_data;
if (ff->open_flags & FOPEN_CACHE_DIR)
fuse_readdir_cache_end(file, ctx->pos);
} else if (plus) {
err = parse_dirplusfile(page_address(page), nbytes,
res = parse_dirplusfile(page_address(page), res,
file, ctx, attr_version);
} else {
err = parse_dirfile(page_address(page), nbytes, file,
res = parse_dirfile(page_address(page), res, file,
ctx);
}
}
__free_page(page);
fuse_invalidate_atime(inode);
return err;
return res;
}
enum fuse_parse_result {
@ -372,11 +386,13 @@ static enum fuse_parse_result fuse_parse_cache(struct fuse_file *ff,
for (;;) {
struct fuse_dirent *dirent = addr + offset;
unsigned int nbytes = size - offset;
size_t reclen = FUSE_DIRENT_SIZE(dirent);
size_t reclen;
if (nbytes < FUSE_NAME_OFFSET || !dirent->namelen)
break;
reclen = FUSE_DIRENT_SIZE(dirent); /* derefs ->namelen */
if (WARN_ON(dirent->namelen > FUSE_NAME_MAX))
return FOUND_ERR;
if (WARN_ON(reclen > nbytes))

76
fs/fuse/xattr.c
View File

@ -25,15 +25,15 @@ int fuse_setxattr(struct inode *inode, const char *name, const void *value,
memset(&inarg, 0, sizeof(inarg));
inarg.size = size;
inarg.flags = flags;
args.in.h.opcode = FUSE_SETXATTR;
args.in.h.nodeid = get_node_id(inode);
args.in.numargs = 3;
args.in.args[0].size = sizeof(inarg);
args.in.args[0].value = &inarg;
args.in.args[1].size = strlen(name) + 1;
args.in.args[1].value = name;
args.in.args[2].size = size;
args.in.args[2].value = value;
args.opcode = FUSE_SETXATTR;
args.nodeid = get_node_id(inode);
args.in_numargs = 3;
args.in_args[0].size = sizeof(inarg);
args.in_args[0].value = &inarg;
args.in_args[1].size = strlen(name) + 1;
args.in_args[1].value = name;
args.in_args[2].size = size;
args.in_args[2].value = value;
err = fuse_simple_request(fc, &args);
if (err == -ENOSYS) {
fc->no_setxattr = 1;
@ -60,22 +60,22 @@ ssize_t fuse_getxattr(struct inode *inode, const char *name, void *value,
memset(&inarg, 0, sizeof(inarg));
inarg.size = size;
args.in.h.opcode = FUSE_GETXATTR;
args.in.h.nodeid = get_node_id(inode);
args.in.numargs = 2;
args.in.args[0].size = sizeof(inarg);
args.in.args[0].value = &inarg;
args.in.args[1].size = strlen(name) + 1;
args.in.args[1].value = name;
args.opcode = FUSE_GETXATTR;
args.nodeid = get_node_id(inode);
args.in_numargs = 2;
args.in_args[0].size = sizeof(inarg);
args.in_args[0].value = &inarg;
args.in_args[1].size = strlen(name) + 1;
args.in_args[1].value = name;
/* This is really two different operations rolled into one */
args.out.numargs = 1;
args.out_numargs = 1;
if (size) {
args.out.argvar = 1;
args.out.args[0].size = size;
args.out.args[0].value = value;
args.out_argvar = true;
args.out_args[0].size = size;
args.out_args[0].value = value;
} else {
args.out.args[0].size = sizeof(outarg);
args.out.args[0].value = &outarg;
args.out_args[0].size = sizeof(outarg);
args.out_args[0].value = &outarg;
}
ret = fuse_simple_request(fc, &args);
if (!ret && !size)
@ -121,20 +121,20 @@ ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size)
memset(&inarg, 0, sizeof(inarg));
inarg.size = size;
args.in.h.opcode = FUSE_LISTXATTR;
args.in.h.nodeid = get_node_id(inode);
args.in.numargs = 1;
args.in.args[0].size = sizeof(inarg);
args.in.args[0].value = &inarg;
args.opcode = FUSE_LISTXATTR;
args.nodeid = get_node_id(inode);
args.in_numargs = 1;
args.in_args[0].size = sizeof(inarg);
args.in_args[0].value = &inarg;
/* This is really two different operations rolled into one */
args.out.numargs = 1;
args.out_numargs = 1;
if (size) {
args.out.argvar = 1;
args.out.args[0].size = size;
args.out.args[0].value = list;
args.out_argvar = true;
args.out_args[0].size = size;
args.out_args[0].value = list;
} else {
args.out.args[0].size = sizeof(outarg);
args.out.args[0].value = &outarg;
args.out_args[0].size = sizeof(outarg);
args.out_args[0].value = &outarg;
}
ret = fuse_simple_request(fc, &args);
if (!ret && !size)
@ -157,11 +157,11 @@ int fuse_removexattr(struct inode *inode, const char *name)
if (fc->no_removexattr)
return -EOPNOTSUPP;
args.in.h.opcode = FUSE_REMOVEXATTR;
args.in.h.nodeid = get_node_id(inode);
args.in.numargs = 1;
args.in.args[0].size = strlen(name) + 1;
args.in.args[0].value = name;
args.opcode = FUSE_REMOVEXATTR;
args.nodeid = get_node_id(inode);
args.in_numargs = 1;
args.in_args[0].size = strlen(name) + 1;
args.in_args[0].value = name;
err = fuse_simple_request(fc, &args);
if (err == -ENOSYS) {
fc->no_removexattr = 1;

2
fs/namespace.c
View File

@ -2802,8 +2802,6 @@ static int do_new_mount(struct path *path, const char *fstype, int sb_flags,
put_filesystem(type);
return -EINVAL;
}
} else {
subtype = "";
}
}

2
fs/proc_namespace.c
View File

@ -88,7 +88,7 @@ static inline void mangle(struct seq_file *m, const char *s)
static void show_type(struct seq_file *m, struct super_block *sb)
{
mangle(m, sb->s_type->name);
if (sb->s_subtype && sb->s_subtype[0]) {
if (sb->s_subtype) {
seq_putc(m, '.');
mangle(m, sb->s_subtype);
}

5
fs/super.c
View File

@ -1555,11 +1555,6 @@ int vfs_get_tree(struct fs_context *fc)
sb = fc->root->d_sb;
WARN_ON(!sb->s_bdi);
if (fc->subtype && !sb->s_subtype) {
sb->s_subtype = fc->subtype;
fc->subtype = NULL;
}
/*
* Write barrier is for super_cache_count(). We place it before setting
* SB_BORN as the data dependency between the two functions is the

1
include/linux/fs_context.h
View File

@ -95,7 +95,6 @@ struct fs_context {
const struct cred *cred; /* The mounter's credentials */
struct fc_log *log; /* Logging buffer */
const char *source; /* The source name (eg. dev path) */
const char *subtype; /* The subtype to set on the superblock */
void *security; /* Linux S&M options */
void *s_fs_info; /* Proposed s_fs_info */
unsigned int sb_flags; /* Proposed superblock flags (SB_*) */

4
include/uapi/linux/fuse.h
View File

@ -425,6 +425,10 @@ enum fuse_opcode {
/* CUSE specific operations */
CUSE_INIT = 4096,
/* Reserved opcodes: helpful to detect structure endian-ness */
CUSE_INIT_BSWAP_RESERVED = 1048576, /* CUSE_INIT << 8 */
FUSE_INIT_BSWAP_RESERVED = 436207616, /* FUSE_INIT << 24 */
};
enum fuse_notify_code {