summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
Diffstat
-rw-r--r--fs/fuse/dev.c57
-rw-r--r--fs/fuse/dir.c58
-rw-r--r--fs/fuse/file.c58
-rw-r--r--fs/fuse/fuse_i.h10
-rw-r--r--include/linux/fuse.h16
5 files changed, 149 insertions, 50 deletions
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 2aaf3ea..5f3368a 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -1378,7 +1378,59 @@ static int fuse_notify_inval_entry(struct fuse_conn *fc, unsigned int size,
down_read(&fc->killsb);
err = -ENOENT;
if (fc->sb)
- err = fuse_reverse_inval_entry(fc->sb, outarg.parent, &name);
+ err = fuse_reverse_inval_entry(fc->sb, outarg.parent, 0, &name);
+ up_read(&fc->killsb);
+ kfree(buf);
+ return err;
+
+err:
+ kfree(buf);
+ fuse_copy_finish(cs);
+ return err;
+}
+
+static int fuse_notify_delete(struct fuse_conn *fc, unsigned int size,
+ struct fuse_copy_state *cs)
+{
+ struct fuse_notify_delete_out outarg;
+ int err = -ENOMEM;
+ char *buf;
+ struct qstr name;
+
+ buf = kzalloc(FUSE_NAME_MAX + 1, GFP_KERNEL);
+ if (!buf)
+ goto err;
+
+ err = -EINVAL;
+ 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;
+
+ err = -EINVAL;
+ if (size != sizeof(outarg) + outarg.namelen + 1)
+ 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)
+ err = fuse_reverse_inval_entry(fc->sb, outarg.parent,
+ outarg.child, &name);
up_read(&fc->killsb);
kfree(buf);
return err;
@@ -1597,6 +1649,9 @@ static int fuse_notify(struct fuse_conn *fc, enum fuse_notify_code code,
case FUSE_NOTIFY_RETRIEVE:
return fuse_notify_retrieve(fc, size, cs);
+ case FUSE_NOTIFY_DELETE:
+ return fuse_notify_delete(fc, size, cs);
+
default:
fuse_copy_finish(cs);
return -EINVAL;
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 5ddd6ea8..2066328 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -868,7 +868,7 @@ int fuse_update_attributes(struct inode *inode, struct kstat *stat,
}
int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
- struct qstr *name)
+ u64 child_nodeid, struct qstr *name)
{
int err = -ENOTDIR;
struct inode *parent;
@@ -895,8 +895,36 @@ int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
fuse_invalidate_attr(parent);
fuse_invalidate_entry(entry);
+
+ if (child_nodeid != 0 && entry->d_inode) {
+ mutex_lock(&entry->d_inode->i_mutex);
+ if (get_node_id(entry->d_inode) != child_nodeid) {
+ err = -ENOENT;
+ goto badentry;
+ }
+ if (d_mountpoint(entry)) {
+ err = -EBUSY;
+ goto badentry;
+ }
+ if (S_ISDIR(entry->d_inode->i_mode)) {
+ shrink_dcache_parent(entry);
+ if (!simple_empty(entry)) {
+ err = -ENOTEMPTY;
+ goto badentry;
+ }
+ entry->d_inode->i_flags |= S_DEAD;
+ }
+ dont_mount(entry);
+ clear_nlink(entry->d_inode);
+ err = 0;
+ badentry:
+ mutex_unlock(&entry->d_inode->i_mutex);
+ if (!err)
+ d_delete(entry);
+ } else {
+ err = 0;
+ }
dput(entry);
- err = 0;
unlock:
mutex_unlock(&parent->i_mutex);
@@ -1182,6 +1210,30 @@ static int fuse_dir_fsync(struct file *file, loff_t start, loff_t end,
return fuse_fsync_common(file, start, end, datasync, 1);
}
+static long fuse_dir_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host);
+
+ /* FUSE_IOCTL_DIR only supported for API version >= 7.18 */
+ if (fc->minor < 18)
+ return -ENOTTY;
+
+ return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_DIR);
+}
+
+static long fuse_dir_compat_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host);
+
+ if (fc->minor < 18)
+ return -ENOTTY;
+
+ return fuse_ioctl_common(file, cmd, arg,
+ FUSE_IOCTL_COMPAT | FUSE_IOCTL_DIR);
+}
+
static bool update_mtime(unsigned ivalid)
{
/* Always update if mtime is explicitly set */
@@ -1596,6 +1648,8 @@ static const struct file_operations fuse_dir_operations = {
.open = fuse_dir_open,
.release = fuse_dir_release,
.fsync = fuse_dir_fsync,
+ .unlocked_ioctl = fuse_dir_ioctl,
+ .compat_ioctl = fuse_dir_compat_ioctl,
};
static const struct inode_operations fuse_common_inode_operations = {
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 0c84100..4a199fd 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1555,48 +1555,16 @@ static loff_t fuse_file_llseek(struct file *file, loff_t offset, int origin)
loff_t retval;
struct inode *inode = file->f_path.dentry->d_inode;
- mutex_lock(&inode->i_mutex);
- if (origin != SEEK_CUR && origin != SEEK_SET) {
- retval = fuse_update_attributes(inode, NULL, file, NULL);
- if (retval)
- goto exit;
- }
+ /* No i_mutex protection necessary for SEEK_CUR and SEEK_SET */
+ if (origin == SEEK_CUR || origin == SEEK_SET)
+ return generic_file_llseek(file, offset, origin);
- switch (origin) {
- case SEEK_END:
- offset += i_size_read(inode);
- break;
- case SEEK_CUR:
- if (offset == 0) {
- retval = file->f_pos;
- goto exit;
- }
- offset += file->f_pos;
- break;
- case SEEK_DATA:
- if (offset >= i_size_read(inode)) {
- retval = -ENXIO;
- goto exit;
- }
- break;
- case SEEK_HOLE:
- if (offset >= i_size_read(inode)) {
- retval = -ENXIO;
- goto exit;
- }
- offset = i_size_read(inode);
- break;
- }
- retval = -EINVAL;
- if (offset >= 0 && offset <= inode->i_sb->s_maxbytes) {
- if (offset != file->f_pos) {
- file->f_pos = offset;
- file->f_version = 0;
- }
- retval = offset;
- }
-exit:
+ mutex_lock(&inode->i_mutex);
+ retval = fuse_update_attributes(inode, NULL, file, NULL);
+ if (!retval)
+ retval = generic_file_llseek(file, offset, origin);
mutex_unlock(&inode->i_mutex);
+
return retval;
}
@@ -1808,7 +1776,7 @@ long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
BUILD_BUG_ON(sizeof(struct fuse_ioctl_iovec) * FUSE_IOCTL_MAX_IOV > PAGE_SIZE);
err = -ENOMEM;
- pages = kzalloc(sizeof(pages[0]) * FUSE_MAX_PAGES_PER_REQ, GFP_KERNEL);
+ pages = kcalloc(FUSE_MAX_PAGES_PER_REQ, sizeof(pages[0]), GFP_KERNEL);
iov_page = (struct iovec *) __get_free_page(GFP_KERNEL);
if (!pages || !iov_page)
goto out;
@@ -1958,8 +1926,8 @@ long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
}
EXPORT_SYMBOL_GPL(fuse_do_ioctl);
-static long fuse_file_ioctl_common(struct file *file, unsigned int cmd,
- unsigned long arg, unsigned int flags)
+long fuse_ioctl_common(struct file *file, unsigned int cmd,
+ unsigned long arg, unsigned int flags)
{
struct inode *inode = file->f_dentry->d_inode;
struct fuse_conn *fc = get_fuse_conn(inode);
@@ -1976,13 +1944,13 @@ static long fuse_file_ioctl_common(struct file *file, unsigned int cmd,
static long fuse_file_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
- return fuse_file_ioctl_common(file, cmd, arg, 0);
+ return fuse_ioctl_common(file, cmd, arg, 0);
}
static long fuse_file_compat_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
- return fuse_file_ioctl_common(file, cmd, arg, FUSE_IOCTL_COMPAT);
+ return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_COMPAT);
}
/*
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 1964da0..572cefc 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -755,9 +755,15 @@ int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid,
/**
* File-system tells the kernel to invalidate parent attributes and
* the dentry matching parent/name.
+ *
+ * If the child_nodeid is non-zero and:
+ * - matches the inode number for the dentry matching parent/name,
+ * - is not a mount point
+ * - is a file or oan empty directory
+ * then the dentry is unhashed (d_delete()).
*/
int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
- struct qstr *name);
+ u64 child_nodeid, struct qstr *name);
int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file,
bool isdir);
@@ -765,6 +771,8 @@ ssize_t fuse_direct_io(struct file *file, const char __user *buf,
size_t count, loff_t *ppos, int write);
long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
unsigned int flags);
+long fuse_ioctl_common(struct file *file, unsigned int cmd,
+ unsigned long arg, unsigned int flags);
unsigned fuse_file_poll(struct file *file, poll_table *wait);
int fuse_dev_release(struct inode *inode, struct file *file);
diff --git a/include/linux/fuse.h b/include/linux/fuse.h
index 464cff5..8ba2c94 100644
--- a/include/linux/fuse.h
+++ b/include/linux/fuse.h
@@ -50,6 +50,10 @@
*
* 7.17
* - add FUSE_FLOCK_LOCKS and FUSE_RELEASE_FLOCK_UNLOCK
+ *
+ * 7.18
+ * - add FUSE_IOCTL_DIR flag
+ * - add FUSE_NOTIFY_DELETE
*/
#ifndef _LINUX_FUSE_H
@@ -81,7 +85,7 @@
#define FUSE_KERNEL_VERSION 7
/** Minor version number of this interface */
-#define FUSE_KERNEL_MINOR_VERSION 17
+#define FUSE_KERNEL_MINOR_VERSION 18
/** The node ID of the root inode */
#define FUSE_ROOT_ID 1
@@ -214,6 +218,7 @@ struct fuse_file_lock {
* FUSE_IOCTL_UNRESTRICTED: not restricted to well-formed ioctls, retry allowed
* FUSE_IOCTL_RETRY: retry with new iovecs
* FUSE_IOCTL_32BIT: 32bit ioctl
+ * FUSE_IOCTL_DIR: is a directory
*
* FUSE_IOCTL_MAX_IOV: maximum of in_iovecs + out_iovecs
*/
@@ -221,6 +226,7 @@ struct fuse_file_lock {
#define FUSE_IOCTL_UNRESTRICTED (1 << 1)
#define FUSE_IOCTL_RETRY (1 << 2)
#define FUSE_IOCTL_32BIT (1 << 3)
+#define FUSE_IOCTL_DIR (1 << 4)
#define FUSE_IOCTL_MAX_IOV 256
@@ -283,6 +289,7 @@ enum fuse_notify_code {
FUSE_NOTIFY_INVAL_ENTRY = 3,
FUSE_NOTIFY_STORE = 4,
FUSE_NOTIFY_RETRIEVE = 5,
+ FUSE_NOTIFY_DELETE = 6,
FUSE_NOTIFY_CODE_MAX,
};
@@ -606,6 +613,13 @@ struct fuse_notify_inval_entry_out {
__u32 padding;
};
+struct fuse_notify_delete_out {
+ __u64 parent;
+ __u64 child;
+ __u32 namelen;
+ __u32 padding;
+};
+
struct fuse_notify_store_out {
__u64 nodeid;
__u64 offset;
OpenPOWER on IntegriCloud