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linux/fs/nfs
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Trond Myklebust 794092c57f NFS: Do uncached readdir when we're seeking a cookie in an empty page cache 
If the directory is changing, causing the page cache to get invalidated
while we are listing the contents, then the NFS client is currently forced
to read in the entire directory contents from scratch, because it needs
to perform a linear search for the readdir cookie. While this is not
an issue for small directories, it does not scale to directories with
millions of entries.
In order to be able to deal with large directories that are changing,
add a heuristic to ensure that if the page cache is empty, and we are
searching for a cookie that is not the zero cookie, we just default to
performing uncached readdir.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Reviewed-by: Benjamin Coddington <bcodding@redhat.com>
Tested-by: Benjamin Coddington <bcodding@redhat.com>
Tested-by: Dave Wysochanski <dwysocha@redhat.com>
2020-12-02 14:05:52 -05:00
..
blocklayout treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
filelayout treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
flexfilelayout pNFS/flexfiles: Fix array overflow when flexfiles mirroring is enabled 2020-11-30 10:52:22 -05:00
cache_lib.c NFS client updates for Linux 4.15 2017-11-17 14:18:00 -08:00
cache_lib.h NFS client updates for Linux 4.15 2017-11-17 14:18:00 -08:00
callback_proc.c NFSv4: Add support for CB_RECALL_ANY for flexfiles layouts 2020-03-16 08:34:30 -04:00
callback_xdr.c NFS4: Report callback authentication errors 2020-01-15 10:54:31 -05:00
callback.c SUNRPC: Cache the process user cred in the RPC server listener 2019-04-24 09:46:35 -04:00
callback.h NFSv4: Add support for CB_RECALL_ANY for flexfiles layouts 2020-03-16 08:34:30 -04:00
client.c NFS: Support larger readdir buffers 2020-12-02 14:05:52 -05:00
delegation.c NFS: Beware when dereferencing the delegation cred 2020-04-03 18:26:02 -04:00
delegation.h NFSv4: Ensure the delegation is pinned in nfs_do_return_delegation() 2020-02-13 16:18:50 -05:00
dir.c NFS: Do uncached readdir when we're seeking a cookie in an empty page cache 2020-12-02 14:05:52 -05:00
direct.c NFS client updates for Linux 5.9 2020-08-15 08:26:55 -07:00
dns_resolve.c NFS: remove duplicate headers 2020-05-27 10:10:12 -04:00
dns_resolve.h
export.c NFS: Add a tracepoint in nfs_fh_to_dentry() 2019-11-03 21:28:46 -05:00
file.c NFS client updates for Linux 5.9 2020-08-15 08:26:55 -07:00
fs_context.c NFS Client Updates for Linux 5.10 2020-10-20 13:26:30 -07:00
fscache-index.c nfs: fscache: use timespec64 in inode auxdata 2020-01-15 10:54:30 -05:00
fscache.c NFSv4: Fix fscache cookie aux_data to ensure change_attr is included 2020-05-08 22:20:24 +01:00
fscache.h nfs: fscache: use timespec64 in inode auxdata 2020-01-15 10:54:30 -05:00
getroot.c NFS: Ensure security label is set for root inode 2020-03-30 19:56:50 -04:00
inode.c NFS: Improve handling of directory verifiers 2020-12-02 14:05:52 -05:00
internal.h NFS: Support larger readdir buffers 2020-12-02 14:05:52 -05:00
io.c NFS: Fix up documentation warnings 2019-02-20 15:14:21 -05:00
iostat.h
Kconfig Documentation: nfsroot.rst: Fix references to nfsroot.rst 2020-03-02 13:11:46 -07:00
Makefile NFSv4.2: add client side xattr caching. 2020-07-13 17:52:46 -04:00
mount_clnt.c NFSv3: fix rpc receive buffer size for MOUNT call 2020-05-14 18:42:44 -04:00
namespace.c NFS: fix nfs_path in case of a rename retry 2020-10-06 10:21:18 -04:00
netns.h NFS: Add sysfs support for per-container identifier 2019-07-06 14:54:49 -04:00
nfs2super.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
nfs2xdr.c nfs: remove timespec from xdr_encode_nfstime 2020-01-15 10:54:30 -05:00
nfs3_fs.h NFS: Additional refactoring for fs_context conversion 2020-01-15 10:15:17 -05:00
nfs3acl.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
nfs3client.c NFS: Additional refactoring for fs_context conversion 2020-01-15 10:15:17 -05:00
nfs3proc.c NFS: Allow the NFS generic code to pass in a verifier to readdir 2020-12-02 14:05:52 -05:00
nfs3super.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
nfs3xdr.c NFS/pnfs: Fix pnfs_generic_prepare_to_resend_writes() 2020-01-15 10:54:32 -05:00
nfs4_fs.h NFSv4: Wait for stateid updates after CLOSE/OPEN_DOWNGRADE 2020-10-02 08:43:09 -04:00
nfs4client.c NFS: Add READ_PLUS data segment support 2020-10-07 14:28:39 -04:00
nfs4file.c NFSv4.2: Fix 5 seconds delay when doing inter server copy 2020-12-02 13:45:33 -05:00
nfs4getroot.c
nfs4idmap.c NFS: Only reference user namespace from nfs4idmap struct instead of cred 2020-10-13 15:56:54 -04:00
nfs4idmap.h
nfs4namespace.c nfs: Fix memory leak of export_path 2020-06-26 08:43:14 -04:00
nfs4proc.c NFS: Handle NFS4ERR_NOT_SAME and NFSERR_BADCOOKIE from readdir calls 2020-12-02 14:05:52 -05:00
nfs4renewd.c NFSv4.0: nfs4_do_fsinfo() should not do implicit lease renewals 2020-02-04 12:27:55 -05:00
nfs4session.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
nfs4session.h NFSv4.1: Bump the default callback session slot count to 16 2019-03-02 16:25:26 -05:00
nfs4state.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
nfs4super.c NFSv4.2: Fix NFS4ERR_STALE error when doing inter server copy 2020-10-21 10:31:20 -04:00
nfs4sysctl.c nfs: Do not convert nfs_idmap_cache_timeout to jiffies 2018-01-18 15:10:47 -05:00
nfs4trace.c pNFS/flexfiles: Add tracing for layout errors 2020-01-15 10:54:33 -05:00
nfs4trace.h NFSv4: Wait for stateid updates after CLOSE/OPEN_DOWNGRADE 2020-10-02 08:43:09 -04:00
nfs4xdr.c NFS: Add READ_PLUS data segment support 2020-10-07 14:28:39 -04:00
nfs42.h NFSv4.2: add the extended attribute proc functions. 2020-07-13 17:52:45 -04:00
nfs42proc.c NFS: Fix rpcrdma_inline_fixup() crash with new LISTXATTRS operation 2020-12-02 13:19:20 -05:00
nfs42xattr.c NFSv4.2: fix failure to unregister shrinker 2020-11-12 10:40:02 -05:00
nfs42xdr.c NFS: Fix rpcrdma_inline_fixup() crash with new LISTXATTRS operation 2020-12-02 13:19:20 -05:00
nfs.h
nfsroot.c nfsroot: Default mount option should ask for built-in NFS version 2020-11-02 10:29:03 -05:00
nfstrace.c NFS: Add trace events to report non-zero NFS status codes 2019-02-13 12:03:21 -05:00
nfstrace.h nfs: define and use the NFS_INO_INVALID_XATTR flag 2020-07-13 17:52:45 -04:00
pagelist.c pNFS/flexfiles: Fix array overflow when flexfiles mirroring is enabled 2020-11-30 10:52:22 -05:00
pnfs_dev.c NFS/flexfiles: Speed up read failover when DSes are down 2019-03-01 22:37:38 -05:00
pnfs_nfs.c NFS/pnfs: Don't use RPC_TASK_CRED_NOREF with pnfs 2020-05-13 09:55:36 -04:00
pnfs.c nfs: fix spellint typo in pnfs.c 2020-09-24 10:42:49 -04:00
pnfs.h NFS: Fix flexfiles read failover 2020-08-12 11:20:29 -04:00
proc.c NFS: Allow the NFS generic code to pass in a verifier to readdir 2020-12-02 14:05:52 -05:00
read.c NFS: Trace short NFS READs 2020-06-11 13:33:48 -04:00
super.c The one new feature this time, from Anna Schumaker, is READ_PLUS, which 2020-10-22 09:44:27 -07:00
symlink.c nfs: pass the correct prototype to read_cache_page 2019-05-09 16:26:57 -04:00
sysctl.c
sysfs.c NFSv4: Fix up RCU annotations for struct nfs_netns_client 2020-10-15 13:31:08 -04:00
sysfs.h NFSv4: Fix up RCU annotations for struct nfs_netns_client 2020-10-15 13:31:08 -04:00
unlink.c NFS: Avoid referencing the cred twice in async rename/unlink 2020-03-16 08:34:29 -04:00
write.c mm/writeback: discard NR_UNSTABLE_NFS, use NR_WRITEBACK instead 2020-06-02 10:59:08 -07:00