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Diffstat (limited to 'fs/fuse/file.c')
-rw-r--r--fs/fuse/file.c111
1 files changed, 86 insertions, 25 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index c4b98c03a46..0fcdba9d47c 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -28,7 +28,9 @@ static int fuse_send_open(struct inode *inode, struct file *file, int isdir,
return PTR_ERR(req);
memset(&inarg, 0, sizeof(inarg));
- inarg.flags = file->f_flags & ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);
+ inarg.flags = file->f_flags & ~(O_CREAT | O_EXCL | O_NOCTTY);
+ if (!fc->atomic_o_trunc)
+ inarg.flags &= ~O_TRUNC;
req->in.h.opcode = isdir ? FUSE_OPENDIR : FUSE_OPEN;
req->in.h.nodeid = get_node_id(inode);
req->in.numargs = 1;
@@ -54,6 +56,7 @@ struct fuse_file *fuse_file_alloc(void)
kfree(ff);
ff = NULL;
}
+ INIT_LIST_HEAD(&ff->write_entry);
atomic_set(&ff->count, 0);
}
return ff;
@@ -148,12 +151,18 @@ int fuse_release_common(struct inode *inode, struct file *file, int isdir)
{
struct fuse_file *ff = file->private_data;
if (ff) {
+ struct fuse_conn *fc = get_fuse_conn(inode);
+
fuse_release_fill(ff, get_node_id(inode), file->f_flags,
isdir ? FUSE_RELEASEDIR : FUSE_RELEASE);
/* Hold vfsmount and dentry until release is finished */
ff->reserved_req->vfsmount = mntget(file->f_path.mnt);
ff->reserved_req->dentry = dget(file->f_path.dentry);
+
+ spin_lock(&fc->lock);
+ list_del(&ff->write_entry);
+ spin_unlock(&fc->lock);
/*
* Normally this will send the RELEASE request,
* however if some asynchronous READ or WRITE requests
@@ -180,7 +189,7 @@ static int fuse_release(struct inode *inode, struct file *file)
* Scramble the ID space with XTEA, so that the value of the files_struct
* pointer is not exposed to userspace.
*/
-static u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id)
+u64 fuse_lock_owner_id(struct fuse_conn *fc, fl_owner_t id)
{
u32 *k = fc->scramble_key;
u64 v = (unsigned long) id;
@@ -299,11 +308,19 @@ void fuse_read_fill(struct fuse_req *req, struct fuse_file *ff,
}
static size_t fuse_send_read(struct fuse_req *req, struct file *file,
- struct inode *inode, loff_t pos, size_t count)
+ struct inode *inode, loff_t pos, size_t count,
+ fl_owner_t owner)
{
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_file *ff = file->private_data;
+
fuse_read_fill(req, ff, inode, pos, count, FUSE_READ);
+ if (owner != NULL) {
+ struct fuse_read_in *inarg = &req->misc.read_in;
+
+ inarg->read_flags |= FUSE_READ_LOCKOWNER;
+ inarg->lock_owner = fuse_lock_owner_id(fc, owner);
+ }
request_send(fc, req);
return req->out.args[0].size;
}
@@ -327,7 +344,8 @@ static int fuse_readpage(struct file *file, struct page *page)
req->out.page_zeroing = 1;
req->num_pages = 1;
req->pages[0] = page;
- fuse_send_read(req, file, inode, page_offset(page), PAGE_CACHE_SIZE);
+ fuse_send_read(req, file, inode, page_offset(page), PAGE_CACHE_SIZE,
+ NULL);
err = req->out.h.error;
fuse_put_request(fc, req);
if (!err)
@@ -434,30 +452,47 @@ out:
return err;
}
-static size_t fuse_send_write(struct fuse_req *req, struct file *file,
- struct inode *inode, loff_t pos, size_t count)
+static void fuse_write_fill(struct fuse_req *req, struct fuse_file *ff,
+ struct inode *inode, loff_t pos, size_t count,
+ int writepage)
{
struct fuse_conn *fc = get_fuse_conn(inode);
- struct fuse_file *ff = file->private_data;
- struct fuse_write_in inarg;
- struct fuse_write_out outarg;
+ struct fuse_write_in *inarg = &req->misc.write.in;
+ struct fuse_write_out *outarg = &req->misc.write.out;
- memset(&inarg, 0, sizeof(struct fuse_write_in));
- inarg.fh = ff->fh;
- inarg.offset = pos;
- inarg.size = count;
+ memset(inarg, 0, sizeof(struct fuse_write_in));
+ inarg->fh = ff->fh;
+ inarg->offset = pos;
+ inarg->size = count;
+ inarg->write_flags = writepage ? FUSE_WRITE_CACHE : 0;
req->in.h.opcode = FUSE_WRITE;
req->in.h.nodeid = get_node_id(inode);
req->in.argpages = 1;
req->in.numargs = 2;
- req->in.args[0].size = sizeof(struct fuse_write_in);
- req->in.args[0].value = &inarg;
+ if (fc->minor < 9)
+ req->in.args[0].size = FUSE_COMPAT_WRITE_IN_SIZE;
+ else
+ req->in.args[0].size = sizeof(struct fuse_write_in);
+ req->in.args[0].value = inarg;
req->in.args[1].size = count;
req->out.numargs = 1;
req->out.args[0].size = sizeof(struct fuse_write_out);
- req->out.args[0].value = &outarg;
+ req->out.args[0].value = outarg;
+}
+
+static size_t fuse_send_write(struct fuse_req *req, struct file *file,
+ struct inode *inode, loff_t pos, size_t count,
+ fl_owner_t owner)
+{
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ fuse_write_fill(req, file->private_data, inode, pos, count, 0);
+ if (owner != NULL) {
+ struct fuse_write_in *inarg = &req->misc.write.in;
+ inarg->write_flags |= FUSE_WRITE_LOCKOWNER;
+ inarg->lock_owner = fuse_lock_owner_id(fc, owner);
+ }
request_send(fc, req);
- return outarg.size;
+ return req->misc.write.out.size;
}
static int fuse_write_begin(struct file *file, struct address_space *mapping,
@@ -478,6 +513,7 @@ 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;
@@ -491,7 +527,7 @@ static int fuse_buffered_write(struct file *file, struct inode *inode,
req->num_pages = 1;
req->pages[0] = page;
req->page_offset = offset;
- nres = fuse_send_write(req, file, inode, pos, count);
+ nres = fuse_send_write(req, file, inode, pos, count, NULL);
err = req->out.h.error;
fuse_put_request(fc, req);
if (!err && !nres)
@@ -499,6 +535,7 @@ 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);
@@ -591,9 +628,11 @@ static ssize_t fuse_direct_io(struct file *file, const char __user *buf,
nbytes = (req->num_pages << PAGE_SHIFT) - req->page_offset;
nbytes = min(count, nbytes);
if (write)
- nres = fuse_send_write(req, file, inode, pos, nbytes);
+ nres = fuse_send_write(req, file, inode, pos, nbytes,
+ current->files);
else
- nres = fuse_send_read(req, file, inode, pos, nbytes);
+ nres = fuse_send_read(req, file, inode, pos, nbytes,
+ current->files);
fuse_release_user_pages(req, !write);
if (req->out.h.error) {
if (!res)
@@ -695,7 +734,8 @@ static int convert_fuse_file_lock(const struct fuse_file_lock *ffl,
}
static void fuse_lk_fill(struct fuse_req *req, struct file *file,
- const struct file_lock *fl, int opcode, pid_t pid)
+ const struct file_lock *fl, int opcode, pid_t pid,
+ int flock)
{
struct inode *inode = file->f_path.dentry->d_inode;
struct fuse_conn *fc = get_fuse_conn(inode);
@@ -708,6 +748,8 @@ static void fuse_lk_fill(struct fuse_req *req, struct file *file,
arg->lk.end = fl->fl_end;
arg->lk.type = fl->fl_type;
arg->lk.pid = pid;
+ if (flock)
+ arg->lk_flags |= FUSE_LK_FLOCK;
req->in.h.opcode = opcode;
req->in.h.nodeid = get_node_id(inode);
req->in.numargs = 1;
@@ -727,7 +769,7 @@ static int fuse_getlk(struct file *file, struct file_lock *fl)
if (IS_ERR(req))
return PTR_ERR(req);
- fuse_lk_fill(req, file, fl, FUSE_GETLK, 0);
+ fuse_lk_fill(req, file, fl, FUSE_GETLK, 0, 0);
req->out.numargs = 1;
req->out.args[0].size = sizeof(outarg);
req->out.args[0].value = &outarg;
@@ -740,7 +782,7 @@ static int fuse_getlk(struct file *file, struct file_lock *fl)
return err;
}
-static int fuse_setlk(struct file *file, struct file_lock *fl)
+static int fuse_setlk(struct file *file, struct file_lock *fl, int flock)
{
struct inode *inode = file->f_path.dentry->d_inode;
struct fuse_conn *fc = get_fuse_conn(inode);
@@ -757,7 +799,7 @@ static int fuse_setlk(struct file *file, struct file_lock *fl)
if (IS_ERR(req))
return PTR_ERR(req);
- fuse_lk_fill(req, file, fl, opcode, pid);
+ fuse_lk_fill(req, file, fl, opcode, pid, flock);
request_send(fc, req);
err = req->out.h.error;
/* locking is restartable */
@@ -783,8 +825,25 @@ static int fuse_file_lock(struct file *file, int cmd, struct file_lock *fl)
if (fc->no_lock)
err = posix_lock_file_wait(file, fl);
else
- err = fuse_setlk(file, fl);
+ err = fuse_setlk(file, fl, 0);
+ }
+ return err;
+}
+
+static int fuse_file_flock(struct file *file, int cmd, struct file_lock *fl)
+{
+ struct inode *inode = file->f_path.dentry->d_inode;
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ int err;
+
+ if (fc->no_lock) {
+ err = flock_lock_file_wait(file, fl);
+ } else {
+ /* emulate flock with POSIX locks */
+ fl->fl_owner = (fl_owner_t) file;
+ err = fuse_setlk(file, fl, 1);
}
+
return err;
}
@@ -836,6 +895,7 @@ static const struct file_operations fuse_file_operations = {
.release = fuse_release,
.fsync = fuse_fsync,
.lock = fuse_file_lock,
+ .flock = fuse_file_flock,
.splice_read = generic_file_splice_read,
};
@@ -848,6 +908,7 @@ static const struct file_operations fuse_direct_io_file_operations = {
.release = fuse_release,
.fsync = fuse_fsync,
.lock = fuse_file_lock,
+ .flock = fuse_file_flock,
/* no mmap and splice_read */
};
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-30 08:17:15 +0000