The patch improves error handling in fuse_direct_IO(): if we successfully
submitted several fuse requests on behalf of synchronous direct write
extending file and some of them failed, let's try to do our best to clean-up.
Changed in v2: reuse fuse_do_setattr(). Thanks to Brian for suggestion.
Signed-off-by: Maxim Patlasov <mpatla...@parallels.com>
---
fs/fuse/dir.c | 17 +++++++++--------
fs/fuse/file.c | 27 +++++++++++++++++++++++++--
fs/fuse/fuse_i.h | 3 +++
3 files changed, 37 insertions(+), 10 deletions(-)
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 20b52a5..049d4c2 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -1532,10 +1532,9 @@ void fuse_release_nowrite(struct inode *inode)
* vmtruncate() doesn't allow for this case, so do the rlimit checking
* and the actual truncation by hand.
*/
-static int fuse_do_setattr(struct dentry *entry, struct iattr *attr,
- struct file *file)
+int fuse_do_setattr(struct inode *inode, struct iattr *attr,
+ struct file *file)
{
- struct inode *inode = entry->d_inode;
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_req *req;
struct fuse_setattr_in inarg;
@@ -1544,9 +1543,6 @@ static int fuse_do_setattr(struct dentry *entry, struct
iattr *attr,
loff_t oldsize;
int err;
- if (!fuse_allow_task(fc, current))
- return -EACCES;
-
if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS))
attr->ia_valid |= ATTR_FORCE;
@@ -1641,10 +1637,15 @@ error:
static int fuse_setattr(struct dentry *entry, struct iattr *attr)
{
+ struct inode *inode = entry->d_inode;
+
+ if (!fuse_allow_task(get_fuse_conn(inode), current))
+ return -EACCES;
+
if (attr->ia_valid & ATTR_FILE)
- return fuse_do_setattr(entry, attr, attr->ia_file);
+ return fuse_do_setattr(inode, attr, attr->ia_file);
else
- return fuse_do_setattr(entry, attr, NULL);
+ return fuse_do_setattr(inode, attr, NULL);
}
static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry,
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 05eed23..d9a0568 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -2340,6 +2340,25 @@ int fuse_notify_poll_wakeup(struct fuse_conn *fc,
return 0;
}
+static void fuse_do_truncate(struct file *file)
+{
+ struct inode *inode = file->f_mapping->host;
+ struct iattr attr;
+ int err;
+
+ attr.ia_valid = ATTR_SIZE;
+ attr.ia_size = i_size_read(inode);
+
+ attr.ia_file = file;
+ attr.ia_valid |= ATTR_FILE;
+
+ err = fuse_do_setattr(inode, &attr, file);
+
+ if (err)
+ printk(KERN_WARNING "failed to truncate to %lld with error "
+ "%d\n", i_size_read(inode), err);
+}
+
static ssize_t
fuse_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
loff_t offset, unsigned long nr_segs)
@@ -2400,8 +2419,12 @@ fuse_direct_IO(int rw, struct kiocb *iocb, const struct
iovec *iov,
kfree(io);
}
- if (rw == WRITE && ret > 0)
- fuse_write_update_size(inode, pos);
+ if (rw == WRITE) {
+ if (ret > 0)
+ fuse_write_update_size(inode, pos);
+ else if (ret < 0 && offset + count > i_size)
+ fuse_do_truncate(file);
+ }
return ret;
}
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 91b5192..d4f7f07 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -840,4 +840,7 @@ int fuse_dev_release(struct inode *inode, struct file
*file);
void fuse_write_update_size(struct inode *inode, loff_t pos);
+int fuse_do_setattr(struct inode *inode, struct iattr *attr,
+ struct file *file);
+
#endif /* _FS_FUSE_I_H */
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