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BACKPORT: fuse: always revalidate if exclusive create

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commit df8629af293493757beccac2d3168fe5a315636e upstream.

Failure to do so may result in EEXIST even if the file only exists in the
cache and not in the filesystem.

The atomic nature of O_EXCL mandates that the cached state should be
ignored and existence verified anew.

Reported-by: Ken Schalk <kschalk@nvidia.com>
Change-Id: I7bc67048363004f94dfe7b74d0873c019f06eaef
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Wu Bo <bo.wu@vivo.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Miklos Szeredi 2020-11-11 17:22:32 +01:00 • committed by Alexander Martinz
commit 3a772729dd
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1 changed files with 1 additions and 2 deletions
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3
fs/fuse/dir.c
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@ -231,7 +231,6 @@ static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags)
inode = d_inode_rcu(entry);
if (inode && fuse_is_bad(inode))
goto invalid;
#ifdef CONFIG_FUSE_BPF
/* TODO: Do we need bpf support for revalidate?
* If the lower filesystem says the entry is invalid, FUSE probably shouldn't
@ -245,7 +244,7 @@ static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags)
}
#endif
if (time_before64(fuse_dentry_time(entry), get_jiffies_64()) ||
(flags & LOOKUP_REVAL)) {
(flags & (LOOKUP_EXCL | LOOKUP_REVAL))) {
struct fuse_entry_out outarg;
struct fuse_entry_bpf bpf_arg;
FUSE_ARGS(args);