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fuse: fix attr version comparison in fuse_read_update_size()

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commit 484ce65715 upstream.

A READ request returning a short count is taken as indication of EOF, and
the cached file size is modified accordingly.

Fix the attribute version checking to allow for changes to fc->attr_version
on other inodes.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Yang Bo <yb203166@antfin.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Miklos Szeredi 2021-10-22 17:03:03 +02:00 • committed by Greg Kroah-Hartman
commit 42dfdbd4dc
1 changed files with 1 additions and 1 deletions
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2
fs/fuse/file.c
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@ -782,7 +782,7 @@ static void fuse_read_update_size(struct inode *inode, loff_t size,
struct fuse_inode *fi = get_fuse_inode(inode);
spin_lock(&fi->lock);
if (attr_ver == fi->attr_version && size < inode->i_size &&
if (attr_ver >= fi->attr_version && size < inode->i_size &&
!test_bit(FUSE_I_SIZE_UNSTABLE, &fi->state)) {
fi->attr_version = atomic64_inc_return(&fc->attr_version);
i_size_write(inode, size);