From e331f2f2b1fbb5157dfb4f0a977bc8c3737e5927 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Sat, 19 Nov 2016 10:54:55 -0500 Subject: NFS: Fix a performance regression in readdir commit 79f687a3de9e3ba2518b4ea33f38ca6cbe9133eb upstream. Ben Coddington reports that commit 311324ad1713, by adding the function nfs_dir_mapping_need_revalidate() that checks page cache validity on each call to nfs_readdir() causes a performance regression when the directory is being modified. If the directory is changing while we're iterating through the directory, POSIX does not require us to invalidate the page cache unless the user calls rewinddir(). However, we still do want to ensure that we use readdirplus in order to avoid a load of stat() calls when the user is doing an 'ls -l' workload. The fix should be to invalidate the page cache immediately when we're setting the NFS_INO_ADVISE_RDPLUS bit. Reported-by: Benjamin Coddington Fixes: 311324ad1713 ("NFS: Be more aggressive in using readdirplus...") Reviewed-by: Benjamin Coddington Tested-by: Benjamin Coddington Signed-off-by: Trond Myklebust Signed-off-by: Greg Kroah-Hartman --- fs/nfs/dir.c | 15 ++------------- 1 file changed, 2 insertions(+), 13 deletions(-) (limited to 'fs') diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c index 5f1af4cd1a33..53e02b8bd9bd 100644 --- a/fs/nfs/dir.c +++ b/fs/nfs/dir.c @@ -477,7 +477,7 @@ void nfs_force_use_readdirplus(struct inode *dir) { if (!list_empty(&NFS_I(dir)->open_files)) { nfs_advise_use_readdirplus(dir); - nfs_zap_mapping(dir, dir->i_mapping); + invalidate_mapping_pages(dir->i_mapping, 0, -1); } } @@ -886,17 +886,6 @@ int uncached_readdir(nfs_readdir_descriptor_t *desc) goto out; } -static bool nfs_dir_mapping_need_revalidate(struct inode *dir) -{ - struct nfs_inode *nfsi = NFS_I(dir); - - if (nfs_attribute_cache_expired(dir)) - return true; - if (nfsi->cache_validity & NFS_INO_INVALID_DATA) - return true; - return false; -} - /* The file offset position represents the dirent entry number. A last cookie cache takes care of the common case of reading the whole directory. @@ -928,7 +917,7 @@ static int nfs_readdir(struct file *file, struct dir_context *ctx) desc->decode = NFS_PROTO(inode)->decode_dirent; desc->plus = nfs_use_readdirplus(inode, ctx) ? 1 : 0; - if (ctx->pos == 0 || nfs_dir_mapping_need_revalidate(inode)) + if (ctx->pos == 0 || nfs_attribute_cache_expired(inode)) res = nfs_revalidate_mapping(inode, file->f_mapping); if (res < 0) goto out; -- cgit v1.2.3