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Message-Id: <1239674094-30894-4-git-send-email-tj@kernel.org>
Date: Tue, 14 Apr 2009 10:54:51 +0900
From: Tejun Heo <tj@...nel.org>
To: linux-kernel@...r.kernel.org, fuse-devel@...ts.sourceforge.net,
miklos@...redi.hu
Cc: Tejun Heo <tj@...nel.org>
Subject: [PATCH 3/6] FUSE: make ff->fi optional
Allow ff->fi to be NULL. fi related operations are skipped if ff->fi
is unavailable and nodeid is assumed to be zero.
Signed-off-by: Tejun Heo <tj@...nel.org>
---
fs/fuse/file.c | 58 +++++++++++++++++++++++++++++++++++++----------------
fs/fuse/fuse_i.h | 2 +-
2 files changed, 41 insertions(+), 19 deletions(-)
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index f32d2c8..54ad406 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -339,7 +339,8 @@ int fuse_fsync_common(struct fuse_file *ff, int datasync, int isdir)
if (err)
return err;
- fuse_sync_writes(ff->fi);
+ if (ff->fi)
+ fuse_sync_writes(ff->fi);
req = fuse_get_req(fc);
if (IS_ERR(req))
@@ -413,6 +414,9 @@ static void fuse_read_update_size(struct fuse_file *ff, loff_t size,
struct fuse_conn *fc = ff->fc;
struct fuse_inode *fi = ff->fi;
+ if (!fi)
+ return;
+
spin_lock(&fc->lock);
if (attr_ver == fi->attr_version && size < fi->inode.i_size) {
fi->attr_version = ++fc->attr_version;
@@ -441,7 +445,8 @@ static int fuse_readpage(struct file *file, struct page *page)
* page-cache page, so make sure we read a properly synced
* page.
*/
- fuse_wait_on_page_writeback(ff->fi, page->index);
+ if (ff->fi)
+ fuse_wait_on_page_writeback(ff->fi, page->index);
req = fuse_get_req(fc);
err = PTR_ERR(req);
@@ -468,7 +473,8 @@ static int fuse_readpage(struct file *file, struct page *page)
SetPageUptodate(page);
}
- fuse_invalidate_attr(ff->fi); /* atime changed */
+ if (ff->fi)
+ fuse_invalidate_attr(ff->fi); /* atime changed */
out:
unlock_page(page);
return err;
@@ -489,7 +495,8 @@ static void fuse_readpages_end(struct fuse_conn *fc, struct fuse_req *req)
fuse_read_update_size(ff, pos, req->misc.read.attr_ver);
}
- fuse_invalidate_attr(ff->fi); /* atime changed */
+ if (ff->fi)
+ fuse_invalidate_attr(ff->fi); /* atime changed */
for (i = 0; i < req->num_pages; i++) {
struct page *page = req->pages[i];
@@ -534,7 +541,8 @@ static int fuse_readpages_fill(void *data, struct page *page)
struct fuse_file *ff = req->ff;
struct fuse_conn *fc = ff->fc;
- fuse_wait_on_page_writeback(ff->fi, page->index);
+ if (ff->fi)
+ fuse_wait_on_page_writeback(ff->fi, page->index);
if (req->num_pages &&
(req->num_pages == FUSE_MAX_PAGES_PER_REQ ||
@@ -587,7 +595,7 @@ static ssize_t fuse_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
struct fuse_file *ff = iocb->ki_filp->private_data;
struct fuse_inode *fi = ff->fi;
- if (pos + iov_length(iov, nr_segs) > i_size_read(&fi->inode)) {
+ if (fi && pos + iov_length(iov, nr_segs) > i_size_read(&fi->inode)) {
int err;
/*
* If trying to read past EOF, make sure the i_size
@@ -661,6 +669,9 @@ static void fuse_write_update_size(struct fuse_file *ff, loff_t pos)
struct fuse_conn *fc = ff->fc;
struct fuse_inode *fi = ff->fi;
+ if (!fi)
+ return;
+
spin_lock(&fc->lock);
fi->attr_version = ++fc->attr_version;
if (pos > fi->inode.i_size)
@@ -684,7 +695,8 @@ static int fuse_buffered_write(struct fuse_file *ff, loff_t pos, unsigned count,
* Make sure writepages on the same page are not mixed up with
* plain writes.
*/
- fuse_wait_on_page_writeback(ff->fi, page->index);
+ if (ff->fi)
+ fuse_wait_on_page_writeback(ff->fi, page->index);
req = fuse_get_req(fc);
if (IS_ERR(req))
@@ -705,7 +717,8 @@ static int fuse_buffered_write(struct fuse_file *ff, loff_t pos, unsigned count,
if (count == PAGE_CACHE_SIZE)
SetPageUptodate(page);
}
- fuse_invalidate_attr(ff->fi);
+ if (ff->fi)
+ fuse_invalidate_attr(ff->fi);
return err ? err : nres;
}
@@ -731,8 +744,10 @@ static size_t fuse_send_write_pages(struct fuse_req *req, struct fuse_file *ff,
unsigned offset;
unsigned i;
- for (i = 0; i < req->num_pages; i++)
- fuse_wait_on_page_writeback(ff->fi, req->pages[i]->index);
+ if (ff->fi)
+ for (i = 0; i < req->num_pages; i++)
+ fuse_wait_on_page_writeback(ff->fi,
+ req->pages[i]->index);
res = fuse_send_write(req, ff, pos, count, NULL);
@@ -863,7 +878,8 @@ static ssize_t fuse_perform_write(struct fuse_file *ff, struct iov_iter *ii,
if (res > 0)
fuse_write_update_size(ff, pos);
- fuse_invalidate_attr(ff->fi);
+ if (ff->fi)
+ fuse_invalidate_attr(ff->fi);
return res > 0 ? res : err;
}
@@ -1030,7 +1046,8 @@ static ssize_t fuse_direct_io(struct fuse_file *ff, const char __user *buf,
fuse_write_update_size(ff, pos);
*ppos = pos;
}
- fuse_invalidate_attr(ff->fi);
+ if (ff->fi)
+ fuse_invalidate_attr(ff->fi);
return res;
}
@@ -1266,9 +1283,11 @@ static struct vm_operations_struct fuse_file_vm_ops = {
static int fuse_file_mmap(struct file *file, struct vm_area_struct *vma)
{
- if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_MAYWRITE)) {
- struct fuse_file *ff = file->private_data;
- struct fuse_conn *fc = ff->fc;
+ struct fuse_file *ff = file->private_data;
+ struct fuse_conn *fc = ff->fc;
+
+ if (ff->fi &&
+ (vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_MAYWRITE)) {
/*
* file may be written through mmap, so chain it onto the
* inodes's write_file list
@@ -1479,9 +1498,12 @@ static loff_t fuse_file_llseek(struct file *file, loff_t offset, int origin)
mutex_lock(&vfs_inode->i_mutex);
switch (origin) {
case SEEK_END:
- retval = fuse_update_attributes(ff->fi, NULL, file, NULL);
- if (retval)
- goto exit;
+ if (ff->fi) {
+ retval = fuse_update_attributes(ff->fi, NULL, file,
+ NULL);
+ if (retval)
+ goto exit;
+ }
offset += i_size_read(vfs_inode);
break;
case SEEK_CUR:
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index c9ffaa0..016a745 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -501,7 +501,7 @@ static inline u64 get_node_id(struct inode *inode)
static inline u64 fuse_file_nodeid(struct fuse_file *ff)
{
- return ff->fi->nodeid;
+ return ff->fi ? ff->fi->nodeid : 0;
}
static inline struct inode *fuse_file_vfs_inode(struct fuse_file *ff)
--
1.6.0.2
--
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