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-rw-r--r--Documentation/filesystems/dax.rst20
-rw-r--r--fs/fuse/dax.c36
-rw-r--r--fs/fuse/dir.c91
-rw-r--r--fs/fuse/file.c6
-rw-r--r--fs/fuse/fuse_i.h31
-rw-r--r--fs/fuse/inode.c89
-rw-r--r--fs/fuse/virtio_fs.c18
-rw-r--r--include/uapi/linux/fuse.h55
8 files changed, 294 insertions, 52 deletions
diff --git a/Documentation/filesystems/dax.rst b/Documentation/filesystems/dax.rst
index 9a1b8fd9e82b..e3b30429d703 100644
--- a/Documentation/filesystems/dax.rst
+++ b/Documentation/filesystems/dax.rst
@@ -23,8 +23,8 @@ on it as usual. The `DAX` code currently only supports files with a block
size equal to your kernel's `PAGE_SIZE`, so you may need to specify a block
size when creating the filesystem.
-Currently 3 filesystems support `DAX`: ext2, ext4 and xfs. Enabling `DAX` on them
-is different.
+Currently 4 filesystems support `DAX`: ext2, ext4, xfs and virtiofs.
+Enabling `DAX` on them is different.
Enabling DAX on ext2
--------------------
@@ -168,6 +168,22 @@ if the underlying media does not support dax and/or the filesystem is
overridden with a mount option.
+Enabling DAX on virtiofs
+----------------------------
+The semantic of DAX on virtiofs is basically equal to that on ext4 and xfs,
+except that when '-o dax=inode' is specified, virtiofs client derives the hint
+whether DAX shall be enabled or not from virtiofs server through FUSE protocol,
+rather than the persistent `FS_XFLAG_DAX` flag. That is, whether DAX shall be
+enabled or not is completely determined by virtiofs server, while virtiofs
+server itself may deploy various algorithm making this decision, e.g. depending
+on the persistent `FS_XFLAG_DAX` flag on the host.
+
+It is still supported to set or clear persistent `FS_XFLAG_DAX` flag inside
+guest, but it is not guaranteed that DAX will be enabled or disabled for
+corresponding file then. Users inside guest still need to call statx(2) and
+check the statx flag `STATX_ATTR_DAX` to see if DAX is enabled for this file.
+
+
Implementation Tips for Block Driver Writers
--------------------------------------------
diff --git a/fs/fuse/dax.c b/fs/fuse/dax.c
index 713818d74de6..182b24a14804 100644
--- a/fs/fuse/dax.c
+++ b/fs/fuse/dax.c
@@ -1279,11 +1279,14 @@ out_err:
return ret;
}
-int fuse_dax_conn_alloc(struct fuse_conn *fc, struct dax_device *dax_dev)
+int fuse_dax_conn_alloc(struct fuse_conn *fc, enum fuse_dax_mode dax_mode,
+ struct dax_device *dax_dev)
{
struct fuse_conn_dax *fcd;
int err;
+ fc->dax_mode = dax_mode;
+
if (!dax_dev)
return 0;
@@ -1327,17 +1330,46 @@ static const struct address_space_operations fuse_dax_file_aops = {
.invalidatepage = noop_invalidatepage,
};
-void fuse_dax_inode_init(struct inode *inode)
+static bool fuse_should_enable_dax(struct inode *inode, unsigned int flags)
{
struct fuse_conn *fc = get_fuse_conn(inode);
+ enum fuse_dax_mode dax_mode = fc->dax_mode;
+
+ if (dax_mode == FUSE_DAX_NEVER)
+ return false;
+ /*
+ * fc->dax may be NULL in 'inode' mode when filesystem device doesn't
+ * support DAX, in which case it will silently fallback to 'never' mode.
+ */
if (!fc->dax)
+ return false;
+
+ if (dax_mode == FUSE_DAX_ALWAYS)
+ return true;
+
+ /* dax_mode is FUSE_DAX_INODE* */
+ return fc->inode_dax && (flags & FUSE_ATTR_DAX);
+}
+
+void fuse_dax_inode_init(struct inode *inode, unsigned int flags)
+{
+ if (!fuse_should_enable_dax(inode, flags))
return;
inode->i_flags |= S_DAX;
inode->i_data.a_ops = &fuse_dax_file_aops;
}
+void fuse_dax_dontcache(struct inode *inode, unsigned int flags)
+{
+ struct fuse_conn *fc = get_fuse_conn(inode);
+
+ if (fuse_is_inode_dax_mode(fc->dax_mode) &&
+ ((bool) IS_DAX(inode) != (bool) (flags & FUSE_ATTR_DAX)))
+ d_mark_dontcache(inode);
+}
+
bool fuse_dax_check_alignment(struct fuse_conn *fc, unsigned int map_alignment)
{
if (fc->dax && (map_alignment > FUSE_DAX_SHIFT)) {
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 0654bfedcbb0..656e921f3506 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -17,6 +17,9 @@
#include <linux/xattr.h>
#include <linux/iversion.h>
#include <linux/posix_acl.h>
+#include <linux/security.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
static void fuse_advise_use_readdirplus(struct inode *dir)
{
@@ -456,6 +459,62 @@ static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
return ERR_PTR(err);
}
+static int get_security_context(struct dentry *entry, umode_t mode,
+ void **security_ctx, u32 *security_ctxlen)
+{
+ struct fuse_secctx *fctx;
+ struct fuse_secctx_header *header;
+ void *ctx = NULL, *ptr;
+ u32 ctxlen, total_len = sizeof(*header);
+ int err, nr_ctx = 0;
+ const char *name;
+ size_t namelen;
+
+ err = security_dentry_init_security(entry, mode, &entry->d_name,
+ &name, &ctx, &ctxlen);
+ if (err) {
+ if (err != -EOPNOTSUPP)
+ goto out_err;
+ /* No LSM is supporting this security hook. Ignore error */
+ ctxlen = 0;
+ ctx = NULL;
+ }
+
+ if (ctxlen) {
+ nr_ctx = 1;
+ namelen = strlen(name) + 1;
+ err = -EIO;
+ if (WARN_ON(namelen > XATTR_NAME_MAX + 1 || ctxlen > S32_MAX))
+ goto out_err;
+ total_len += FUSE_REC_ALIGN(sizeof(*fctx) + namelen + ctxlen);
+ }
+
+ err = -ENOMEM;
+ header = ptr = kzalloc(total_len, GFP_KERNEL);
+ if (!ptr)
+ goto out_err;
+
+ header->nr_secctx = nr_ctx;
+ header->size = total_len;
+ ptr += sizeof(*header);
+ if (nr_ctx) {
+ fctx = ptr;
+ fctx->size = ctxlen;
+ ptr += sizeof(*fctx);
+
+ strcpy(ptr, name);
+ ptr += namelen;
+
+ memcpy(ptr, ctx, ctxlen);
+ }
+ *security_ctxlen = total_len;
+ *security_ctx = header;
+ err = 0;
+out_err:
+ kfree(ctx);
+ return err;
+}
+
/*
* Atomic create+open operation
*
@@ -476,6 +535,8 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry,
struct fuse_entry_out outentry;
struct fuse_inode *fi;
struct fuse_file *ff;
+ void *security_ctx = NULL;
+ u32 security_ctxlen;
/* Userspace expects S_IFREG in create mode */
BUG_ON((mode & S_IFMT) != S_IFREG);
@@ -517,7 +578,20 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry,
args.out_args[0].value = &outentry;
args.out_args[1].size = sizeof(outopen);
args.out_args[1].value = &outopen;
+
+ if (fm->fc->init_security) {
+ err = get_security_context(entry, mode, &security_ctx,
+ &security_ctxlen);
+ if (err)
+ goto out_put_forget_req;
+
+ args.in_numargs = 3;
+ args.in_args[2].size = security_ctxlen;
+ args.in_args[2].value = security_ctx;
+ }
+
err = fuse_simple_request(fm, &args);
+ kfree(security_ctx);
if (err)
goto out_free_ff;
@@ -620,6 +694,8 @@ static int create_new_entry(struct fuse_mount *fm, struct fuse_args *args,
struct dentry *d;
int err;
struct fuse_forget_link *forget;
+ void *security_ctx = NULL;
+ u32 security_ctxlen;
if (fuse_is_bad(dir))
return -EIO;
@@ -633,7 +709,22 @@ static int create_new_entry(struct fuse_mount *fm, struct fuse_args *args,
args->out_numargs = 1;
args->out_args[0].size = sizeof(outarg);
args->out_args[0].value = &outarg;
+
+ if (fm->fc->init_security && args->opcode != FUSE_LINK) {
+ err = get_security_context(entry, mode, &security_ctx,
+ &security_ctxlen);
+ if (err)
+ goto out_put_forget_req;
+
+ BUG_ON(args->in_numargs != 2);
+
+ args->in_numargs = 3;
+ args->in_args[2].size = security_ctxlen;
+ args->in_args[2].value = security_ctx;
+ }
+
err = fuse_simple_request(fm, args);
+ kfree(security_ctx);
if (err)
goto out_put_forget_req;
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 9d6c5f6361f7..829094451774 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -2910,7 +2910,7 @@ fuse_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
static int fuse_writeback_range(struct inode *inode, loff_t start, loff_t end)
{
- int err = filemap_write_and_wait_range(inode->i_mapping, start, -1);
+ int err = filemap_write_and_wait_range(inode->i_mapping, start, LLONG_MAX);
if (!err)
fuse_sync_writes(inode);
@@ -3169,7 +3169,7 @@ static const struct address_space_operations fuse_file_aops = {
.write_end = fuse_write_end,
};
-void fuse_init_file_inode(struct inode *inode)
+void fuse_init_file_inode(struct inode *inode, unsigned int flags)
{
struct fuse_inode *fi = get_fuse_inode(inode);
@@ -3183,5 +3183,5 @@ void fuse_init_file_inode(struct inode *inode)
fi->writepages = RB_ROOT;
if (IS_ENABLED(CONFIG_FUSE_DAX))
- fuse_dax_inode_init(inode);
+ fuse_dax_inode_init(inode, flags);
}
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 198637b41e19..e8e59fbdefeb 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -480,6 +480,18 @@ struct fuse_dev {
struct list_head entry;
};
+enum fuse_dax_mode {
+ FUSE_DAX_INODE_DEFAULT, /* default */
+ FUSE_DAX_ALWAYS, /* "-o dax=always" */
+ FUSE_DAX_NEVER, /* "-o dax=never" */
+ FUSE_DAX_INODE_USER, /* "-o dax=inode" */
+};
+
+static inline bool fuse_is_inode_dax_mode(enum fuse_dax_mode mode)
+{
+ return mode == FUSE_DAX_INODE_DEFAULT || mode == FUSE_DAX_INODE_USER;
+}
+
struct fuse_fs_context {
int fd;
struct file *file;
@@ -497,7 +509,7 @@ struct fuse_fs_context {
bool no_control:1;
bool no_force_umount:1;
bool legacy_opts_show:1;
- bool dax:1;
+ enum fuse_dax_mode dax_mode;
unsigned int max_read;
unsigned int blksize;
const char *subtype;
@@ -765,6 +777,12 @@ struct fuse_conn {
/* Propagate syncfs() to server */
unsigned int sync_fs:1;
+ /* Initialize security xattrs when creating a new inode */
+ unsigned int init_security:1;
+
+ /* Does the filesystem support per inode DAX? */
+ unsigned int inode_dax:1;
+
/** The number of requests waiting for completion */
atomic_t num_waiting;
@@ -802,6 +820,9 @@ struct fuse_conn {
struct list_head devices;
#ifdef CONFIG_FUSE_DAX
+ /* Dax mode */
+ enum fuse_dax_mode dax_mode;
+
/* Dax specific conn data, non-NULL if DAX is enabled */
struct fuse_conn_dax *dax;
#endif
@@ -1007,7 +1028,7 @@ int fuse_notify_poll_wakeup(struct fuse_conn *fc,
/**
* Initialize file operations on a regular file
*/
-void fuse_init_file_inode(struct inode *inode);
+void fuse_init_file_inode(struct inode *inode, unsigned int flags);
/**
* Initialize inode operations on regular files and special files
@@ -1269,11 +1290,13 @@ ssize_t fuse_dax_read_iter(struct kiocb *iocb, struct iov_iter *to);
ssize_t fuse_dax_write_iter(struct kiocb *iocb, struct iov_iter *from);
int fuse_dax_mmap(struct file *file, struct vm_area_struct *vma);
int fuse_dax_break_layouts(struct inode *inode, u64 dmap_start, u64 dmap_end);
-int fuse_dax_conn_alloc(struct fuse_conn *fc, struct dax_device *dax_dev);
+int fuse_dax_conn_alloc(struct fuse_conn *fc, enum fuse_dax_mode mode,
+ struct dax_device *dax_dev);
void fuse_dax_conn_free(struct fuse_conn *fc);
bool fuse_dax_inode_alloc(struct super_block *sb, struct fuse_inode *fi);
-void fuse_dax_inode_init(struct inode *inode);
+void fuse_dax_inode_init(struct inode *inode, unsigned int flags);
void fuse_dax_inode_cleanup(struct inode *inode);
+void fuse_dax_dontcache(struct inode *inode, unsigned int flags);
bool fuse_dax_check_alignment(struct fuse_conn *fc, unsigned int map_alignment);
void fuse_dax_cancel_work(struct fuse_conn *fc);
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 8b89e3ba7df3..ee846ce371d8 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -301,6 +301,9 @@ void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
if (inval)
invalidate_inode_pages2(inode->i_mapping);
}
+
+ if (IS_ENABLED(CONFIG_FUSE_DAX))
+ fuse_dax_dontcache(inode, attr->flags);
}
static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr)
@@ -313,7 +316,7 @@ static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr)
inode->i_ctime.tv_nsec = attr->ctimensec;
if (S_ISREG(inode->i_mode)) {
fuse_init_common(inode);
- fuse_init_file_inode(inode);
+ fuse_init_file_inode(inode, attr->flags);
} else if (S_ISDIR(inode->i_mode))
fuse_init_dir(inode);
else if (S_ISLNK(inode->i_mode))
@@ -767,8 +770,12 @@ static int fuse_show_options(struct seq_file *m, struct dentry *root)
seq_printf(m, ",blksize=%lu", sb->s_blocksize);
}
#ifdef CONFIG_FUSE_DAX
- if (fc->dax)
- seq_puts(m, ",dax");
+ if (fc->dax_mode == FUSE_DAX_ALWAYS)
+ seq_puts(m, ",dax=always");
+ else if (fc->dax_mode == FUSE_DAX_NEVER)
+ seq_puts(m, ",dax=never");
+ else if (fc->dax_mode == FUSE_DAX_INODE_USER)
+ seq_puts(m, ",dax=inode");
#endif
return 0;
@@ -1109,73 +1116,80 @@ static void process_init_reply(struct fuse_mount *fm, struct fuse_args *args,
process_init_limits(fc, arg);
if (arg->minor >= 6) {
+ u64 flags = arg->flags | (u64) arg->flags2 << 32;
+
ra_pages = arg->max_readahead / PAGE_SIZE;
- if (arg->flags & FUSE_ASYNC_READ)
+ if (flags & FUSE_ASYNC_READ)
fc->async_read = 1;
- if (!(arg->flags & FUSE_POSIX_LOCKS))
+ if (!(flags & FUSE_POSIX_LOCKS))
fc->no_lock = 1;
if (arg->minor >= 17) {
- if (!(arg->flags & FUSE_FLOCK_LOCKS))
+ if (!(flags & FUSE_FLOCK_LOCKS))
fc->no_flock = 1;
} else {
- if (!(arg->flags & FUSE_POSIX_LOCKS))
+ if (!(flags & FUSE_POSIX_LOCKS))
fc->no_flock = 1;
}
- if (arg->flags & FUSE_ATOMIC_O_TRUNC)
+ if (flags & FUSE_ATOMIC_O_TRUNC)
fc->atomic_o_trunc = 1;
if (arg->minor >= 9) {
/* LOOKUP has dependency on proto version */
- if (arg->flags & FUSE_EXPORT_SUPPORT)
+ if (flags & FUSE_EXPORT_SUPPORT)
fc->export_support = 1;
}
- if (arg->flags & FUSE_BIG_WRITES)
+ if (flags & FUSE_BIG_WRITES)
fc->big_writes = 1;
- if (arg->flags & FUSE_DONT_MASK)
+ if (flags & FUSE_DONT_MASK)
fc->dont_mask = 1;
- if (arg->flags & FUSE_AUTO_INVAL_DATA)
+ if (flags & FUSE_AUTO_INVAL_DATA)
fc->auto_inval_data = 1;
- else if (arg->flags & FUSE_EXPLICIT_INVAL_DATA)
+ else if (flags & FUSE_EXPLICIT_INVAL_DATA)
fc->explicit_inval_data = 1;
- if (arg->flags & FUSE_DO_READDIRPLUS) {
+ if (flags & FUSE_DO_READDIRPLUS) {
fc->do_readdirplus = 1;
- if (arg->flags & FUSE_READDIRPLUS_AUTO)
+ if (flags & FUSE_READDIRPLUS_AUTO)
fc->readdirplus_auto = 1;
}
- if (arg->flags & FUSE_ASYNC_DIO)
+ if (flags & FUSE_ASYNC_DIO)
fc->async_dio = 1;
- if (arg->flags & FUSE_WRITEBACK_CACHE)
+ if (flags & FUSE_WRITEBACK_CACHE)
fc->writeback_cache = 1;
- if (arg->flags & FUSE_PARALLEL_DIROPS)
+ if (flags & FUSE_PARALLEL_DIROPS)
fc->parallel_dirops = 1;
- if (arg->flags & FUSE_HANDLE_KILLPRIV)
+ if (flags & FUSE_HANDLE_KILLPRIV)
fc->handle_killpriv = 1;
if (arg->time_gran && arg->time_gran <= 1000000000)
fm->sb->s_time_gran = arg->time_gran;
- if ((arg->flags & FUSE_POSIX_ACL)) {
+ if ((flags & FUSE_POSIX_ACL)) {
fc->default_permissions = 1;
fc->posix_acl = 1;
fm->sb->s_xattr = fuse_acl_xattr_handlers;
}
- if (arg->flags & FUSE_CACHE_SYMLINKS)
+ if (flags & FUSE_CACHE_SYMLINKS)
fc->cache_symlinks = 1;
- if (arg->flags & FUSE_ABORT_ERROR)
+ if (flags & FUSE_ABORT_ERROR)
fc->abort_err = 1;
- if (arg->flags & FUSE_MAX_PAGES) {
+ if (flags & FUSE_MAX_PAGES) {
fc->max_pages =
min_t(unsigned int, fc->max_pages_limit,
max_t(unsigned int, arg->max_pages, 1));
}
- if (IS_ENABLED(CONFIG_FUSE_DAX) &&
- arg->flags & FUSE_MAP_ALIGNMENT &&
- !fuse_dax_check_alignment(fc, arg->map_alignment)) {
- ok = false;
+ if (IS_ENABLED(CONFIG_FUSE_DAX)) {
+ if (flags & FUSE_MAP_ALIGNMENT &&
+ !fuse_dax_check_alignment(fc, arg->map_alignment)) {
+ ok = false;
+ }
+ if (flags & FUSE_HAS_INODE_DAX)
+ fc->inode_dax = 1;
}
- if (arg->flags & FUSE_HANDLE_KILLPRIV_V2) {
+ if (flags & FUSE_HANDLE_KILLPRIV_V2) {
fc->handle_killpriv_v2 = 1;
fm->sb->s_flags |= SB_NOSEC;
}
- if (arg->flags & FUSE_SETXATTR_EXT)
+ if (flags & FUSE_SETXATTR_EXT)
fc->setxattr_ext = 1;
+ if (flags & FUSE_SECURITY_CTX)
+ fc->init_security = 1;
} else {
ra_pages = fc->max_read / PAGE_SIZE;
fc->no_lock = 1;
@@ -1203,13 +1217,14 @@ static void process_init_reply(struct fuse_mount *fm, struct fuse_args *args,
void fuse_send_init(struct fuse_mount *fm)
{
struct fuse_init_args *ia;
+ u64 flags;
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 = fm->sb->s_bdi->ra_pages * PAGE_SIZE;
- ia->in.flags |=
+ 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 |
@@ -1219,13 +1234,19 @@ void fuse_send_init(struct fuse_mount *fm)
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 |
- FUSE_HANDLE_KILLPRIV_V2 | FUSE_SETXATTR_EXT;
+ FUSE_HANDLE_KILLPRIV_V2 | FUSE_SETXATTR_EXT | FUSE_INIT_EXT |
+ FUSE_SECURITY_CTX;
#ifdef CONFIG_FUSE_DAX
if (fm->fc->dax)
- ia->in.flags |= FUSE_MAP_ALIGNMENT;
+ flags |= FUSE_MAP_ALIGNMENT;
+ if (fuse_is_inode_dax_mode(fm->fc->dax_mode))
+ flags |= FUSE_HAS_INODE_DAX;
#endif
if (fm->fc->auto_submounts)
- ia->in.flags |= FUSE_SUBMOUNTS;
+ flags |= FUSE_SUBMOUNTS;
+
+ ia->in.flags = flags;
+ ia->in.flags2 = flags >> 32;
ia->args.opcode = FUSE_INIT;
ia->args.in_numargs = 1;
@@ -1514,7 +1535,7 @@ int fuse_fill_super_common(struct super_block *sb, struct fuse_fs_context *ctx)
sb->s_subtype = ctx->subtype;
ctx->subtype = NULL;
if (IS_ENABLED(CONFIG_FUSE_DAX)) {
- err = fuse_dax_conn_alloc(fc, ctx->dax_dev);
+ err = fuse_dax_conn_alloc(fc, ctx->dax_mode, ctx->dax_dev);
if (err)
goto err;
}
diff --git a/fs/fuse/virtio_fs.c b/fs/fuse/virtio_fs.c
index 4cfa4bc1f579..e54dc069587d 100644
--- a/fs/fuse/virtio_fs.c
+++ b/fs/fuse/virtio_fs.c
@@ -88,12 +88,21 @@ struct virtio_fs_req_work {
static int virtio_fs_enqueue_req(struct virtio_fs_vq *fsvq,
struct fuse_req *req, bool in_flight);
+static const struct constant_table dax_param_enums[] = {
+ {"always", FUSE_DAX_ALWAYS },
+ {"never", FUSE_DAX_NEVER },
+ {"inode", FUSE_DAX_INODE_USER },
+ {}
+};
+
enum {
OPT_DAX,
+ OPT_DAX_ENUM,
};
static const struct fs_parameter_spec virtio_fs_parameters[] = {
fsparam_flag("dax", OPT_DAX),
+ fsparam_enum("dax", OPT_DAX_ENUM, dax_param_enums),
{}
};
@@ -110,7 +119,10 @@ static int virtio_fs_parse_param(struct fs_context *fsc,
switch (opt) {
case OPT_DAX:
- ctx->dax = 1;
+ ctx->dax_mode = FUSE_DAX_ALWAYS;
+ break;
+ case OPT_DAX_ENUM:
+ ctx->dax_mode = result.uint_32;
break;
default:
return -EINVAL;
@@ -1326,8 +1338,8 @@ static int virtio_fs_fill_super(struct super_block *sb, struct fs_context *fsc)
/* virtiofs allocates and installs its own fuse devices */
ctx->fudptr = NULL;
- if (ctx->dax) {
- if (!fs->dax_dev) {
+ if (ctx->dax_mode != FUSE_DAX_NEVER) {
+ if (ctx->dax_mode == FUSE_DAX_ALWAYS && !fs->dax_dev) {
err = -EINVAL;
pr_err("virtio-fs: dax can't be enabled as filesystem"
" device does not support it.\n");
diff --git a/include/uapi/linux/fuse.h b/include/uapi/linux/fuse.h
index a1dc3ee1d17c..d6ccee961891 100644
--- a/include/uapi/linux/fuse.h
+++ b/include/uapi/linux/fuse.h
@@ -187,6 +187,13 @@
*
* 7.35
* - add FOPEN_NOFLUSH
+ *
+ * 7.36
+ * - extend fuse_init_in with reserved fields, add FUSE_INIT_EXT init flag
+ * - add flags2 to fuse_init_in and fuse_init_out
+ * - add FUSE_SECURITY_CTX init flag
+ * - add security context to create, mkdir, symlink, and mknod requests
+ * - add FUSE_HAS_INODE_DAX, FUSE_ATTR_DAX
*/
#ifndef _LINUX_FUSE_H
@@ -222,7 +229,7 @@
#define FUSE_KERNEL_VERSION 7
/** Minor version number of this interface */
-#define FUSE_KERNEL_MINOR_VERSION 35
+#define FUSE_KERNEL_MINOR_VERSION 36
/** The node ID of the root inode */
#define FUSE_ROOT_ID 1
@@ -341,6 +348,11 @@ struct fuse_file_lock {
* write/truncate sgid is killed only if file has group
* execute permission. (Same as Linux VFS behavior).
* FUSE_SETXATTR_EXT: Server supports extended struct fuse_setxattr_in
+ * FUSE_INIT_EXT: extended fuse_init_in request
+ * FUSE_INIT_RESERVED: reserved, do not use
+ * FUSE_SECURITY_CTX: add security context to create, mkdir, symlink, and
+ * mknod
+ * FUSE_HAS_INODE_DAX: use per inode DAX
*/
#define FUSE_ASYNC_READ (1 << 0)
#define FUSE_POSIX_LOCKS (1 << 1)
@@ -372,6 +384,11 @@ struct fuse_file_lock {
#define FUSE_SUBMOUNTS (1 << 27)
#define FUSE_HANDLE_KILLPRIV_V2 (1 << 28)
#define FUSE_SETXATTR_EXT (1 << 29)
+#define FUSE_INIT_EXT (1 << 30)
+#define FUSE_INIT_RESERVED (1 << 31)
+/* bits 32..63 get shifted down 32 bits into the flags2 field */
+#define FUSE_SECURITY_CTX (1ULL << 32)
+#define FUSE_HAS_INODE_DAX (1ULL << 33)
/**
* CUSE INIT request/reply flags
@@ -454,8 +471,10 @@ struct fuse_file_lock {
* fuse_attr flags
*
* FUSE_ATTR_SUBMOUNT: Object is a submount root
+ * FUSE_ATTR_DAX: Enable DAX for this file in per inode DAX mode
*/
#define FUSE_ATTR_SUBMOUNT (1 << 0)
+#define FUSE_ATTR_DAX (1 << 1)
/**
* Open flags
@@ -741,6 +760,8 @@ struct fuse_init_in {
uint32_t minor;
uint32_t max_readahead;
uint32_t flags;
+ uint32_t flags2;
+ uint32_t unused[11];
};
#define FUSE_COMPAT_INIT_OUT_SIZE 8
@@ -757,7 +778,8 @@ struct fuse_init_out {
uint32_t time_gran;
uint16_t max_pages;
uint16_t map_alignment;
- uint32_t unused[8];
+ uint32_t flags2;
+ uint32_t unused[7];
};
#define CUSE_INIT_INFO_MAX 4096
@@ -865,9 +887,12 @@ struct fuse_dirent {
char name[];
};
-#define FUSE_NAME_OFFSET offsetof(struct fuse_dirent, name)
-#define FUSE_DIRENT_ALIGN(x) \
+/* Align variable length records to 64bit boundary */
+#define FUSE_REC_ALIGN(x) \
(((x) + sizeof(uint64_t) - 1) & ~(sizeof(uint64_t) - 1))
+
+#define FUSE_NAME_OFFSET offsetof(struct fuse_dirent, name)
+#define FUSE_DIRENT_ALIGN(x) FUSE_REC_ALIGN(x)
#define FUSE_DIRENT_SIZE(d) \
FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + (d)->namelen)
@@ -984,4 +1009,26 @@ struct fuse_syncfs_in {
uint64_t padding;
};
+/*
+ * For each security context, send fuse_secctx with size of security context
+ * fuse_secctx will be followed by security context name and this in turn
+ * will be followed by actual context label.
+ * fuse_secctx, name, context
+ */
+struct fuse_secctx {
+ uint32_t size;
+ uint32_t padding;
+};
+
+/*
+ * Contains the information about how many fuse_secctx structures are being
+ * sent and what's the total size of all security contexts (including
+ * size of fuse_secctx_header).
+ *
+ */
+struct fuse_secctx_header {
+ uint32_t size;
+ uint32_t nr_secctx;
+};
+
#endif /* _LINUX_FUSE_H */
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-21 04:10:28 +0300