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-rw-r--r--fs/fuse/file.c49
1 files changed, 37 insertions, 12 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 2ca86141d13a..05dedddf4289 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -163,6 +163,9 @@ static int fuse_flush(struct file *file)
struct fuse_flush_in inarg;
int err;
+ if (is_bad_inode(inode))
+ return -EIO;
+
if (fc->no_flush)
return 0;
@@ -199,6 +202,9 @@ int fuse_fsync_common(struct file *file, struct dentry *de, int datasync,
struct fuse_fsync_in inarg;
int err;
+ if (is_bad_inode(inode))
+ return -EIO;
+
if ((!isdir && fc->no_fsync) || (isdir && fc->no_fsyncdir))
return 0;
@@ -272,16 +278,22 @@ static int fuse_readpage(struct file *file, struct page *page)
{
struct inode *inode = page->mapping->host;
struct fuse_conn *fc = get_fuse_conn(inode);
- loff_t pos = (loff_t) page->index << PAGE_CACHE_SHIFT;
- struct fuse_req *req = fuse_get_request(fc);
- int err = -EINTR;
+ struct fuse_req *req;
+ int err;
+
+ err = -EIO;
+ if (is_bad_inode(inode))
+ goto out;
+
+ err = -EINTR;
+ req = fuse_get_request(fc);
if (!req)
goto out;
req->out.page_zeroing = 1;
req->num_pages = 1;
req->pages[0] = page;
- fuse_send_read(req, file, inode, pos, PAGE_CACHE_SIZE);
+ fuse_send_read(req, file, inode, page_offset(page), PAGE_CACHE_SIZE);
err = req->out.h.error;
fuse_put_request(fc, req);
if (!err)
@@ -295,7 +307,7 @@ static int fuse_readpage(struct file *file, struct page *page)
static int fuse_send_readpages(struct fuse_req *req, struct file *file,
struct inode *inode)
{
- loff_t pos = (loff_t) req->pages[0]->index << PAGE_CACHE_SHIFT;
+ loff_t pos = page_offset(req->pages[0]);
size_t count = req->num_pages << PAGE_CACHE_SHIFT;
unsigned i;
req->out.page_zeroing = 1;
@@ -345,6 +357,10 @@ static int fuse_readpages(struct file *file, struct address_space *mapping,
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_readpages_data data;
int err;
+
+ if (is_bad_inode(inode))
+ return -EIO;
+
data.file = file;
data.inode = inode;
data.req = fuse_get_request(fc);
@@ -402,8 +418,13 @@ static int fuse_commit_write(struct file *file, struct page *page,
unsigned count = to - offset;
struct inode *inode = page->mapping->host;
struct fuse_conn *fc = get_fuse_conn(inode);
- loff_t pos = ((loff_t) page->index << PAGE_CACHE_SHIFT) + offset;
- struct fuse_req *req = fuse_get_request(fc);
+ loff_t pos = page_offset(page) + offset;
+ struct fuse_req *req;
+
+ if (is_bad_inode(inode))
+ return -EIO;
+
+ req = fuse_get_request(fc);
if (!req)
return -EINTR;
@@ -454,7 +475,7 @@ static int fuse_get_user_pages(struct fuse_req *req, const char __user *buf,
nbytes = min(nbytes, (unsigned) FUSE_MAX_PAGES_PER_REQ << PAGE_SHIFT);
npages = (nbytes + offset + PAGE_SIZE - 1) >> PAGE_SHIFT;
- npages = min(npages, FUSE_MAX_PAGES_PER_REQ);
+ npages = min(max(npages, 1), FUSE_MAX_PAGES_PER_REQ);
down_read(&current->mm->mmap_sem);
npages = get_user_pages(current, current->mm, user_addr, npages, write,
0, req->pages, NULL);
@@ -475,12 +496,16 @@ static ssize_t fuse_direct_io(struct file *file, const char __user *buf,
size_t nmax = write ? fc->max_write : fc->max_read;
loff_t pos = *ppos;
ssize_t res = 0;
- struct fuse_req *req = fuse_get_request(fc);
+ struct fuse_req *req;
+
+ if (is_bad_inode(inode))
+ return -EIO;
+
+ req = fuse_get_request(fc);
if (!req)
return -EINTR;
while (count) {
- size_t tmp;
size_t nres;
size_t nbytes = min(count, nmax);
int err = fuse_get_user_pages(req, buf, nbytes, !write);
@@ -488,8 +513,8 @@ static ssize_t fuse_direct_io(struct file *file, const char __user *buf,
res = err;
break;
}
- tmp = (req->num_pages << PAGE_SHIFT) - req->page_offset;
- nbytes = min(nbytes, tmp);
+ nbytes = (req->num_pages << PAGE_SHIFT) - req->page_offset;
+ nbytes = min(count, nbytes);
if (write)
nres = fuse_send_write(req, file, inode, pos, nbytes);
else