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Diffstat (limited to 'fs/fuse/file.c')
-rw-r--r--fs/fuse/file.c190
1 files changed, 165 insertions, 25 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index a841868bf9ce..aba15f1b7ad2 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -194,10 +194,6 @@ int fuse_open_common(struct inode *inode, struct file *file, bool isdir)
struct fuse_conn *fc = get_fuse_conn(inode);
int err;
- /* VFS checks this, but only _after_ ->open() */
- if (file->f_flags & O_DIRECT)
- return -EINVAL;
-
err = generic_file_open(inode, file);
if (err)
return err;
@@ -707,13 +703,16 @@ static ssize_t fuse_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos)
{
struct inode *inode = iocb->ki_filp->f_mapping->host;
+ struct fuse_conn *fc = get_fuse_conn(inode);
- if (pos + iov_length(iov, nr_segs) > i_size_read(inode)) {
+ /*
+ * In auto invalidate mode, always update attributes on read.
+ * Otherwise, only update if we attempt to read past EOF (to ensure
+ * i_size is up to date).
+ */
+ if (fc->auto_inval_data ||
+ (pos + iov_length(iov, nr_segs) > i_size_read(inode))) {
int err;
- /*
- * If trying to read past EOF, make sure the i_size
- * attribute is up-to-date.
- */
err = fuse_update_attributes(inode, NULL, iocb->ki_filp, NULL);
if (err)
return err;
@@ -932,19 +931,24 @@ static ssize_t fuse_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
struct file *file = iocb->ki_filp;
struct address_space *mapping = file->f_mapping;
size_t count = 0;
+ size_t ocount = 0;
ssize_t written = 0;
+ ssize_t written_buffered = 0;
struct inode *inode = mapping->host;
ssize_t err;
struct iov_iter i;
+ loff_t endbyte = 0;
WARN_ON(iocb->ki_pos != pos);
- err = generic_segment_checks(iov, &nr_segs, &count, VERIFY_READ);
+ ocount = 0;
+ err = generic_segment_checks(iov, &nr_segs, &ocount, VERIFY_READ);
if (err)
return err;
+ count = ocount;
+ sb_start_write(inode->i_sb);
mutex_lock(&inode->i_mutex);
- vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
/* We can write back this queue in page reclaim */
current->backing_dev_info = mapping->backing_dev_info;
@@ -960,16 +964,49 @@ static ssize_t fuse_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
if (err)
goto out;
- file_update_time(file);
+ err = file_update_time(file);
+ if (err)
+ goto out;
+
+ if (file->f_flags & O_DIRECT) {
+ written = generic_file_direct_write(iocb, iov, &nr_segs,
+ pos, &iocb->ki_pos,
+ count, ocount);
+ if (written < 0 || written == count)
+ goto out;
- iov_iter_init(&i, iov, nr_segs, count, 0);
- written = fuse_perform_write(file, mapping, &i, pos);
- if (written >= 0)
- iocb->ki_pos = pos + written;
+ pos += written;
+ count -= written;
+ iov_iter_init(&i, iov, nr_segs, count, written);
+ written_buffered = fuse_perform_write(file, mapping, &i, pos);
+ if (written_buffered < 0) {
+ err = written_buffered;
+ goto out;
+ }
+ endbyte = pos + written_buffered - 1;
+
+ err = filemap_write_and_wait_range(file->f_mapping, pos,
+ endbyte);
+ if (err)
+ goto out;
+
+ invalidate_mapping_pages(file->f_mapping,
+ pos >> PAGE_CACHE_SHIFT,
+ endbyte >> PAGE_CACHE_SHIFT);
+
+ written += written_buffered;
+ iocb->ki_pos = pos + written_buffered;
+ } else {
+ iov_iter_init(&i, iov, nr_segs, count, 0);
+ written = fuse_perform_write(file, mapping, &i, pos);
+ if (written >= 0)
+ iocb->ki_pos = pos + written;
+ }
out:
current->backing_dev_info = NULL;
mutex_unlock(&inode->i_mutex);
+ sb_end_write(inode->i_sb);
return written ? written : err;
}
@@ -1101,30 +1138,41 @@ static ssize_t fuse_direct_read(struct file *file, char __user *buf,
return res;
}
-static ssize_t fuse_direct_write(struct file *file, const char __user *buf,
- size_t count, loff_t *ppos)
+static ssize_t __fuse_direct_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
{
struct inode *inode = file->f_path.dentry->d_inode;
ssize_t res;
- if (is_bad_inode(inode))
- return -EIO;
-
- /* Don't allow parallel writes to the same file */
- mutex_lock(&inode->i_mutex);
res = generic_write_checks(file, ppos, &count, 0);
if (!res) {
res = fuse_direct_io(file, buf, count, ppos, 1);
if (res > 0)
fuse_write_update_size(inode, *ppos);
}
- mutex_unlock(&inode->i_mutex);
fuse_invalidate_attr(inode);
return res;
}
+static ssize_t fuse_direct_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct inode *inode = file->f_path.dentry->d_inode;
+ ssize_t res;
+
+ if (is_bad_inode(inode))
+ return -EIO;
+
+ /* Don't allow parallel writes to the same file */
+ mutex_lock(&inode->i_mutex);
+ res = __fuse_direct_write(file, buf, count, ppos);
+ mutex_unlock(&inode->i_mutex);
+
+ return res;
+}
+
static void fuse_writepage_free(struct fuse_conn *fc, struct fuse_req *req)
{
__free_page(req->pages[0]);
@@ -1655,7 +1703,7 @@ static int fuse_verify_ioctl_iov(struct iovec *iov, size_t count)
size_t n;
u32 max = FUSE_MAX_PAGES_PER_REQ << PAGE_SHIFT;
- for (n = 0; n < count; n++) {
+ for (n = 0; n < count; n++, iov++) {
if (iov->iov_len > (size_t) max)
return -ENOMEM;
max -= iov->iov_len;
@@ -2077,6 +2125,95 @@ int fuse_notify_poll_wakeup(struct fuse_conn *fc,
return 0;
}
+static ssize_t fuse_loop_dio(struct file *filp, const struct iovec *iov,
+ unsigned long nr_segs, loff_t *ppos, int rw)
+{
+ const struct iovec *vector = iov;
+ ssize_t ret = 0;
+
+ while (nr_segs > 0) {
+ void __user *base;
+ size_t len;
+ ssize_t nr;
+
+ base = vector->iov_base;
+ len = vector->iov_len;
+ vector++;
+ nr_segs--;
+
+ if (rw == WRITE)
+ nr = __fuse_direct_write(filp, base, len, ppos);
+ else
+ nr = fuse_direct_read(filp, base, len, ppos);
+
+ if (nr < 0) {
+ if (!ret)
+ ret = nr;
+ break;
+ }
+ ret += nr;
+ if (nr != len)
+ break;
+ }
+
+ return ret;
+}
+
+
+static ssize_t
+fuse_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
+ loff_t offset, unsigned long nr_segs)
+{
+ ssize_t ret = 0;
+ struct file *file = NULL;
+ loff_t pos = 0;
+
+ file = iocb->ki_filp;
+ pos = offset;
+
+ ret = fuse_loop_dio(file, iov, nr_segs, &pos, rw);
+
+ return ret;
+}
+
+long fuse_file_fallocate(struct file *file, int mode, loff_t offset,
+ loff_t length)
+{
+ struct fuse_file *ff = file->private_data;
+ struct fuse_conn *fc = ff->fc;
+ struct fuse_req *req;
+ struct fuse_fallocate_in inarg = {
+ .fh = ff->fh,
+ .offset = offset,
+ .length = length,
+ .mode = mode
+ };
+ int err;
+
+ if (fc->no_fallocate)
+ return -EOPNOTSUPP;
+
+ req = fuse_get_req(fc);
+ if (IS_ERR(req))
+ return PTR_ERR(req);
+
+ req->in.h.opcode = FUSE_FALLOCATE;
+ req->in.h.nodeid = ff->nodeid;
+ req->in.numargs = 1;
+ req->in.args[0].size = sizeof(inarg);
+ req->in.args[0].value = &inarg;
+ fuse_request_send(fc, req);
+ err = req->out.h.error;
+ if (err == -ENOSYS) {
+ fc->no_fallocate = 1;
+ err = -EOPNOTSUPP;
+ }
+ fuse_put_request(fc, req);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(fuse_file_fallocate);
+
static const struct file_operations fuse_file_operations = {
.llseek = fuse_file_llseek,
.read = do_sync_read,
@@ -2094,6 +2231,7 @@ static const struct file_operations fuse_file_operations = {
.unlocked_ioctl = fuse_file_ioctl,
.compat_ioctl = fuse_file_compat_ioctl,
.poll = fuse_file_poll,
+ .fallocate = fuse_file_fallocate,
};
static const struct file_operations fuse_direct_io_file_operations = {
@@ -2110,6 +2248,7 @@ static const struct file_operations fuse_direct_io_file_operations = {
.unlocked_ioctl = fuse_file_ioctl,
.compat_ioctl = fuse_file_compat_ioctl,
.poll = fuse_file_poll,
+ .fallocate = fuse_file_fallocate,
/* no splice_read */
};
@@ -2120,6 +2259,7 @@ static const struct address_space_operations fuse_file_aops = {
.readpages = fuse_readpages,
.set_page_dirty = __set_page_dirty_nobuffers,
.bmap = fuse_bmap,
+ .direct_IO = fuse_direct_IO,
};
void fuse_init_file_inode(struct inode *inode)
generated by cgit v1.2.3 (git 2.39.0) at 2025-01-22 21:56:40 +0300