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Message-ID: <20121218100441.12980.71134.stgit@maximpc.sw.ru> Date: Tue, 18 Dec 2012 14:05:08 +0400 From: "Maxim V. Patlasov" <MPatlasov@...allels.com> To: miklos@...redi.hu Cc: dev@...allels.com, xemul@...allels.com, fuse-devel@...ts.sourceforge.net, bfoster@...hat.com, linux-kernel@...r.kernel.org, devel@...nvz.org Subject: [PATCH] fuse: truncate file if async dio failed - v2 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@...allels.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 */ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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