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fuse: truncate file if async dio failed

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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 <mpatlasov@parallels.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
This commit is contained in:
Maxim Patlasov 2012-12-18 14:05:08 +04:00 committed by Miklos Szeredi
parent 439ee5f0c5
commit efb9fa9e91
3 changed files with 32 additions and 10 deletions
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17
fs/fuse/dir.c
View File

@ -1562,10 +1562,9 @@ 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;
@ -1574,9 +1573,6 @@ static int fuse_do_setattr(struct dentry *entry, struct iattr *attr,
loff_t oldsize;
int err;
if (!fuse_allow_current_process(fc))
return -EACCES;
if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS))
attr->ia_valid |= ATTR_FORCE;
@ -1671,10 +1667,15 @@ static int fuse_do_setattr(struct dentry *entry, struct iattr *attr,
static int fuse_setattr(struct dentry *entry, struct iattr *attr)
{
struct inode *inode = entry->d_inode;
if (!fuse_allow_current_process(get_fuse_conn(inode)))
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,

22
fs/fuse/file.c
View File

@ -2352,6 +2352,20 @@ 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;
attr.ia_valid = ATTR_SIZE;
attr.ia_size = i_size_read(inode);
attr.ia_file = file;
attr.ia_valid |= ATTR_FILE;
fuse_do_setattr(inode, &attr, file);
}
static ssize_t
fuse_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
loff_t offset, unsigned long nr_segs)
@ -2419,8 +2433,12 @@ 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;
}

3
fs/fuse/fuse_i.h
View File

@ -863,4 +863,7 @@ 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 */