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NFS: Invalidate negative dentries on all case insensitive directory changes

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If we create a file, rename it, or hardlink it, then we need to assume
that cached negative dentries need to be revalidated.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust 2021-12-17 15:36:56 -05:00 committed by Anna Schumaker
parent 98ca3ee60b
commit 8ce37abdeb
1 changed files with 15 additions and 4 deletions
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19
fs/nfs/dir.c
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@ -1324,6 +1324,14 @@ void nfs_clear_verifier_delegated(struct inode *inode)
EXPORT_SYMBOL_GPL(nfs_clear_verifier_delegated);
#endif /* IS_ENABLED(CONFIG_NFS_V4) */
static int nfs_dentry_verify_change(struct inode *dir, struct dentry *dentry)
{
if (nfs_server_capable(dir, NFS_CAP_CASE_INSENSITIVE) &&
d_really_is_negative(dentry))
return dentry->d_time == inode_peek_iversion_raw(dir);
return nfs_verify_change_attribute(dir, dentry->d_time);
}
/*
* A check for whether or not the parent directory has changed.
* In the case it has, we assume that the dentries are untrustworthy
@ -1337,7 +1345,7 @@ static int nfs_check_verifier(struct inode *dir, struct dentry *dentry,
return 1;
if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONE)
return 0;
if (!nfs_verify_change_attribute(dir, dentry->d_time))
if (!nfs_dentry_verify_change(dir, dentry))
return 0;
/* Revalidate nfsi->cache_change_attribute before we declare a match */
if (nfs_mapping_need_revalidate_inode(dir)) {
@ -1346,7 +1354,7 @@ static int nfs_check_verifier(struct inode *dir, struct dentry *dentry,
if (__nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0)
return 0;
}
if (!nfs_verify_change_attribute(dir, dentry->d_time))
if (!nfs_dentry_verify_change(dir, dentry))
return 0;
return 1;
}
@ -1539,7 +1547,7 @@ nfs_lookup_revalidate_dentry(struct inode *dir, struct dentry *dentry,
* If the lookup failed despite the dentry change attribute being
* a match, then we should revalidate the directory cache.
*/
if (!ret && nfs_verify_change_attribute(dir, dentry->d_time))
if (!ret && nfs_dentry_verify_change(dir, dentry))
nfs_mark_dir_for_revalidate(dir);
return nfs_lookup_revalidate_done(dir, dentry, inode, ret);
}
@ -1778,8 +1786,11 @@ struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, unsigned in
dir_verifier = nfs_save_change_attribute(dir);
trace_nfs_lookup_enter(dir, dentry, flags);
error = NFS_PROTO(dir)->lookup(dir, dentry, fhandle, fattr);
if (error == -ENOENT)
if (error == -ENOENT) {
if (nfs_server_capable(dir, NFS_CAP_CASE_INSENSITIVE))
dir_verifier = inode_peek_iversion_raw(dir);
goto no_entry;
}
if (error < 0) {
res = ERR_PTR(error);
goto out;