fuse: atomic_o_trunc should truncate pagecache
Fuse has an "atomic_o_trunc" mode, where userspace filesystem uses the
O_TRUNC flag in the OPEN request to truncate the file atomically with the
open.
In this mode there's no need to send a SETATTR request to userspace after
the open, so fuse_do_setattr() checks this mode and returns. But this
misses the important step of truncating the pagecache.
Add the missing parts of truncation to the ATTR_OPEN branch.
Reported-by: Chad Austin <chadaustin@fb.com>
Fixes: 6ff958edbf
("fuse: add atomic open+truncate support")
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Cc: <stable@vger.kernel.org>
This commit is contained in:
Родитель
c698ca5278
Коммит
df0e91d488
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@ -1629,8 +1629,19 @@ int fuse_do_setattr(struct dentry *dentry, struct iattr *attr,
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return err;
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return err;
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if (attr->ia_valid & ATTR_OPEN) {
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if (attr->ia_valid & ATTR_OPEN) {
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if (fc->atomic_o_trunc)
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/* This is coming from open(..., ... | O_TRUNC); */
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WARN_ON(!(attr->ia_valid & ATTR_SIZE));
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WARN_ON(attr->ia_size != 0);
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if (fc->atomic_o_trunc) {
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/*
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* No need to send request to userspace, since actual
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* truncation has already been done by OPEN. But still
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* need to truncate page cache.
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*/
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i_size_write(inode, 0);
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truncate_pagecache(inode, 0);
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return 0;
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return 0;
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}
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file = NULL;
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file = NULL;
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}
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}
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