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-rw-r--r--fs/fuse/dir.c125
-rw-r--r--fs/fuse/file.c2
-rw-r--r--fs/fuse/fuse_i.h12
-rw-r--r--fs/fuse/inode.c22
4 files changed, 111 insertions, 50 deletions
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index b18e06daeffb..a058b664859c 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -63,13 +63,21 @@ static u64 time_to_jiffies(unsigned long sec, unsigned long nsec)
* Set dentry and possibly attribute timeouts from the lookup/mk*
* replies
*/
-static void fuse_change_timeout(struct dentry *entry, struct fuse_entry_out *o)
+static void fuse_change_entry_timeout(struct dentry *entry,
+ struct fuse_entry_out *o)
{
fuse_dentry_settime(entry,
time_to_jiffies(o->entry_valid, o->entry_valid_nsec));
- if (entry->d_inode)
- get_fuse_inode(entry->d_inode)->i_time =
- time_to_jiffies(o->attr_valid, o->attr_valid_nsec);
+}
+
+static u64 attr_timeout(struct fuse_attr_out *o)
+{
+ return time_to_jiffies(o->attr_valid, o->attr_valid_nsec);
+}
+
+static u64 entry_attr_timeout(struct fuse_entry_out *o)
+{
+ return time_to_jiffies(o->attr_valid, o->attr_valid_nsec);
}
/*
@@ -140,6 +148,7 @@ static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd)
struct fuse_req *req;
struct fuse_req *forget_req;
struct dentry *parent;
+ u64 attr_version;
/* For negative dentries, always do a fresh lookup */
if (!inode)
@@ -156,6 +165,10 @@ static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd)
return 0;
}
+ spin_lock(&fc->lock);
+ attr_version = fc->attr_version;
+ spin_unlock(&fc->lock);
+
parent = dget_parent(entry);
fuse_lookup_init(req, parent->d_inode, entry, &outarg);
request_send(fc, req);
@@ -180,8 +193,10 @@ static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd)
if (err || (outarg.attr.mode ^ inode->i_mode) & S_IFMT)
return 0;
- fuse_change_attributes(inode, &outarg.attr);
- fuse_change_timeout(entry, &outarg);
+ fuse_change_attributes(inode, &outarg.attr,
+ entry_attr_timeout(&outarg),
+ attr_version);
+ fuse_change_entry_timeout(entry, &outarg);
}
return 1;
}
@@ -228,6 +243,7 @@ static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
struct fuse_conn *fc = get_fuse_conn(dir);
struct fuse_req *req;
struct fuse_req *forget_req;
+ u64 attr_version;
if (entry->d_name.len > FUSE_NAME_MAX)
return ERR_PTR(-ENAMETOOLONG);
@@ -242,6 +258,10 @@ static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
return ERR_PTR(PTR_ERR(forget_req));
}
+ spin_lock(&fc->lock);
+ attr_version = fc->attr_version;
+ spin_unlock(&fc->lock);
+
fuse_lookup_init(req, dir, entry, &outarg);
request_send(fc, req);
err = req->out.h.error;
@@ -253,7 +273,8 @@ static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
err = -EIO;
if (!err && outarg.nodeid) {
inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
- &outarg.attr);
+ &outarg.attr, entry_attr_timeout(&outarg),
+ attr_version);
if (!inode) {
fuse_send_forget(fc, forget_req, outarg.nodeid, 1);
return ERR_PTR(-ENOMEM);
@@ -276,7 +297,7 @@ static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
entry->d_op = &fuse_dentry_operations;
if (!err)
- fuse_change_timeout(entry, &outarg);
+ fuse_change_entry_timeout(entry, &outarg);
else
fuse_invalidate_entry_cache(entry);
return NULL;
@@ -363,7 +384,7 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode,
fuse_put_request(fc, req);
inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation,
- &outentry.attr);
+ &outentry.attr, entry_attr_timeout(&outentry), 0);
if (!inode) {
flags &= ~(O_CREAT | O_EXCL | O_TRUNC);
ff->fh = outopen.fh;
@@ -373,7 +394,7 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode,
}
fuse_put_request(fc, forget_req);
d_instantiate(entry, inode);
- fuse_change_timeout(entry, &outentry);
+ fuse_change_entry_timeout(entry, &outentry);
file = lookup_instantiate_filp(nd, entry, generic_file_open);
if (IS_ERR(file)) {
ff->fh = outopen.fh;
@@ -428,7 +449,7 @@ static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req,
goto out_put_forget_req;
inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
- &outarg.attr);
+ &outarg.attr, entry_attr_timeout(&outarg), 0);
if (!inode) {
fuse_send_forget(fc, forget_req, outarg.nodeid, 1);
return -ENOMEM;
@@ -451,7 +472,7 @@ static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req,
} else
d_instantiate(entry, inode);
- fuse_change_timeout(entry, &outarg);
+ fuse_change_entry_timeout(entry, &outarg);
fuse_invalidate_attr(dir);
return 0;
@@ -663,15 +684,43 @@ static int fuse_link(struct dentry *entry, struct inode *newdir,
return err;
}
-static int fuse_do_getattr(struct inode *inode)
+static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr,
+ struct kstat *stat)
+{
+ stat->dev = inode->i_sb->s_dev;
+ stat->ino = attr->ino;
+ stat->mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777);
+ stat->nlink = attr->nlink;
+ stat->uid = attr->uid;
+ stat->gid = attr->gid;
+ stat->rdev = inode->i_rdev;
+ stat->atime.tv_sec = attr->atime;
+ stat->atime.tv_nsec = attr->atimensec;
+ stat->mtime.tv_sec = attr->mtime;
+ stat->mtime.tv_nsec = attr->mtimensec;
+ stat->ctime.tv_sec = attr->ctime;
+ stat->ctime.tv_nsec = attr->ctimensec;
+ stat->size = attr->size;
+ stat->blocks = attr->blocks;
+ stat->blksize = (1 << inode->i_blkbits);
+}
+
+static int fuse_do_getattr(struct inode *inode, struct kstat *stat)
{
int err;
struct fuse_attr_out arg;
struct fuse_conn *fc = get_fuse_conn(inode);
- struct fuse_req *req = fuse_get_req(fc);
+ struct fuse_req *req;
+ u64 attr_version;
+
+ req = fuse_get_req(fc);
if (IS_ERR(req))
return PTR_ERR(req);
+ spin_lock(&fc->lock);
+ attr_version = fc->attr_version;
+ spin_unlock(&fc->lock);
+
req->in.h.opcode = FUSE_GETATTR;
req->in.h.nodeid = get_node_id(inode);
req->out.numargs = 1;
@@ -685,30 +734,17 @@ static int fuse_do_getattr(struct inode *inode)
make_bad_inode(inode);
err = -EIO;
} else {
- struct fuse_inode *fi = get_fuse_inode(inode);
- fuse_change_attributes(inode, &arg.attr);
- fi->i_time = time_to_jiffies(arg.attr_valid,
- arg.attr_valid_nsec);
+ fuse_change_attributes(inode, &arg.attr,
+ attr_timeout(&arg),
+ attr_version);
+ if (stat)
+ fuse_fillattr(inode, &arg.attr, stat);
}
}
return err;
}
/*
- * Check if attributes are still valid, and if not send a GETATTR
- * request to refresh them.
- */
-static int fuse_refresh_attributes(struct inode *inode)
-{
- struct fuse_inode *fi = get_fuse_inode(inode);
-
- if (fi->i_time < get_jiffies_64())
- return fuse_do_getattr(inode);
- else
- return 0;
-}
-
-/*
* Calling into a user-controlled filesystem gives the filesystem
* daemon ptrace-like capabilities over the requester process. This
* means, that the filesystem daemon is able to record the exact
@@ -795,11 +831,14 @@ static int fuse_permission(struct inode *inode, int mask, struct nameidata *nd)
*/
if ((fc->flags & FUSE_DEFAULT_PERMISSIONS) ||
((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) {
- err = fuse_refresh_attributes(inode);
- if (err)
- return err;
+ struct fuse_inode *fi = get_fuse_inode(inode);
+ if (fi->i_time < get_jiffies_64()) {
+ err = fuse_do_getattr(inode, NULL);
+ if (err)
+ return err;
- refreshed = true;
+ refreshed = true;
+ }
}
if (fc->flags & FUSE_DEFAULT_PERMISSIONS) {
@@ -809,7 +848,7 @@ static int fuse_permission(struct inode *inode, int mask, struct nameidata *nd)
attributes. This is also needed, because the root
node will at first have no permissions */
if (err == -EACCES && !refreshed) {
- err = fuse_do_getattr(inode);
+ err = fuse_do_getattr(inode, NULL);
if (!err)
err = generic_permission(inode, mask, NULL);
}
@@ -825,7 +864,7 @@ static int fuse_permission(struct inode *inode, int mask, struct nameidata *nd)
if (refreshed)
return -EACCES;
- err = fuse_do_getattr(inode);
+ err = fuse_do_getattr(inode, NULL);
if (!err && !(inode->i_mode & S_IXUGO))
return -EACCES;
}
@@ -999,7 +1038,6 @@ static int fuse_setattr(struct dentry *entry, struct iattr *attr)
{
struct inode *inode = entry->d_inode;
struct fuse_conn *fc = get_fuse_conn(inode);
- struct fuse_inode *fi = get_fuse_inode(inode);
struct fuse_req *req;
struct fuse_setattr_in inarg;
struct fuse_attr_out outarg;
@@ -1053,8 +1091,7 @@ static int fuse_setattr(struct dentry *entry, struct iattr *attr)
return -EIO;
}
- fuse_change_attributes(inode, &outarg.attr);
- fi->i_time = time_to_jiffies(outarg.attr_valid, outarg.attr_valid_nsec);
+ fuse_change_attributes(inode, &outarg.attr, attr_timeout(&outarg), 0);
return 0;
}
@@ -1069,8 +1106,10 @@ static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry,
if (!fuse_allow_task(fc, current))
return -EACCES;
- err = fuse_refresh_attributes(inode);
- if (!err) {
+ if (fi->i_time < get_jiffies_64())
+ err = fuse_do_getattr(inode, stat);
+ else {
+ err = 0;
generic_fillattr(inode, stat);
stat->mode = fi->orig_i_mode;
}
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index c4b98c03a46e..4a28c3d37732 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -478,6 +478,7 @@ static int fuse_buffered_write(struct file *file, struct inode *inode,
int err;
size_t nres;
struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_inode *fi = get_fuse_inode(inode);
unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
struct fuse_req *req;
@@ -499,6 +500,7 @@ static int fuse_buffered_write(struct file *file, struct inode *inode,
if (!err) {
pos += nres;
spin_lock(&fc->lock);
+ fi->attr_version = ++fc->attr_version;
if (pos > inode->i_size)
i_size_write(inode, pos);
spin_unlock(&fc->lock);
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index e7464b8ebbfb..ffbcadaa7d67 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -67,6 +67,9 @@ struct fuse_inode {
/** The sticky bit in inode->i_mode may have been removed, so
preserve the original mode */
mode_t orig_i_mode;
+
+ /** Version of last attribute change */
+ u64 attr_version;
};
/** FUSE specific file data */
@@ -387,6 +390,9 @@ struct fuse_conn {
/** Reserved request for the DESTROY message */
struct fuse_req *destroy_req;
+
+ /** Version counter for attribute changes */
+ u64 attr_version;
};
static inline struct fuse_conn *get_fuse_conn_super(struct super_block *sb)
@@ -416,7 +422,8 @@ extern const struct file_operations fuse_dev_operations;
* Get a filled in inode
*/
struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid,
- int generation, struct fuse_attr *attr);
+ int generation, struct fuse_attr *attr,
+ u64 attr_valid, u64 attr_version);
/**
* Send FORGET command
@@ -477,7 +484,8 @@ void fuse_init_symlink(struct inode *inode);
/**
* Change attributes of an inode
*/
-void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr);
+void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
+ u64 attr_valid, u64 attr_version);
/**
* Initialize the client device
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 00bb5a255ded..2167fc4fcab8 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -117,12 +117,22 @@ static void fuse_truncate(struct address_space *mapping, loff_t offset)
unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
}
-void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr)
+
+void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
+ u64 attr_valid, u64 attr_version)
{
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_inode *fi = get_fuse_inode(inode);
loff_t oldsize;
+ spin_lock(&fc->lock);
+ if (attr_version != 0 && fi->attr_version > attr_version) {
+ spin_unlock(&fc->lock);
+ return;
+ }
+ fi->attr_version = ++fc->attr_version;
+ fi->i_time = attr_valid;
+
inode->i_ino = attr->ino;
inode->i_mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777);
inode->i_nlink = attr->nlink;
@@ -145,7 +155,6 @@ void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr)
if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS))
inode->i_mode &= ~S_ISVTX;
- spin_lock(&fc->lock);
oldsize = inode->i_size;
i_size_write(inode, attr->size);
spin_unlock(&fc->lock);
@@ -194,7 +203,8 @@ static int fuse_inode_set(struct inode *inode, void *_nodeidp)
}
struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid,
- int generation, struct fuse_attr *attr)
+ int generation, struct fuse_attr *attr,
+ u64 attr_valid, u64 attr_version)
{
struct inode *inode;
struct fuse_inode *fi;
@@ -222,7 +232,8 @@ struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid,
spin_lock(&fc->lock);
fi->nlookup ++;
spin_unlock(&fc->lock);
- fuse_change_attributes(inode, attr);
+ fuse_change_attributes(inode, attr, attr_valid, attr_version);
+
return inode;
}
@@ -457,6 +468,7 @@ static struct fuse_conn *new_conn(void)
}
fc->reqctr = 0;
fc->blocked = 1;
+ fc->attr_version = 1;
get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));
}
out:
@@ -488,7 +500,7 @@ static struct inode *get_root_inode(struct super_block *sb, unsigned mode)
attr.mode = mode;
attr.ino = FUSE_ROOT_ID;
attr.nlink = 1;
- return fuse_iget(sb, 1, 0, &attr);
+ return fuse_iget(sb, 1, 0, &attr, 0, 0);
}
static const struct super_operations fuse_super_operations = {
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.