From efb9fa9e911b23c7ea5330215bda778a7c69dba8 Mon Sep 17 00:00:00 2001 From: Maxim Patlasov Date: Tue, 18 Dec 2012 14:05:08 +0400 Subject: [PATCH] fuse: truncate file if async dio failed 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 Signed-off-by: Miklos Szeredi --- fs/fuse/dir.c | 17 +++++++++-------- fs/fuse/file.c | 22 ++++++++++++++++++++-- fs/fuse/fuse_i.h | 3 +++ 3 files changed, 32 insertions(+), 10 deletions(-) diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c index ff155224..254df56 100644 --- a/fs/fuse/dir.c +++ b/fs/fuse/dir.c @@ -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 @@ error: 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, diff --git a/fs/fuse/file.c b/fs/fuse/file.c index 8f39f7b..1f8e3d6 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -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; } diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h index 337169a..53b830e 100644 --- a/fs/fuse/fuse_i.h +++ b/fs/fuse/fuse_i.h @@ -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 */ -- 2.7.4