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f1a05fa114
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Ned Bass f1a05fa114 Fix false ENOENT on snapshot control dentries 
Lookups in the snapshot control directory for an existing snapshot
fail with ENOENT if an earlier lookup failed before the snapshot was
created.  This is because the earlier lookup causes a negative dentry
to be cached which is never invalidated.

The bug can be reproduced as follows (the second ls should succeed):

 $ ls /tank/.zfs/snapshot/s
 ls: cannot access /tank/.zfs/snapshot/s: No such file or directory
 $ zfs snap tank@s
 $ ls /tank/.zfs/snapshot/s
 ls: cannot access /tank/.zfs/snapshot/s: No such file or directory

To remedy this, always invalidate cached dentries in the snapshot
control directory.  Since these entries never exist on disk there is
no significant performance penalty for the extra lookups.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1192
2013-01-16 16:28:54 -08:00
..
.gitignore Remove autotools products 2012-08-27 11:47:44 -07:00
always-no-unused-but-set-variable.m4 In autoconf v2.68, AC_LANG_PROGRAM must be quoted 2011-11-28 11:16:33 -08:00
arch.am Don't build packages that haven't been selected. 2012-07-26 13:39:37 -07:00
config.awk Add build system 2010-08-31 13:41:27 -07:00
deb.am Don't build packages that haven't been selected. 2012-07-26 13:39:37 -07:00
kernel-automount.m4 Fix snapshot automounting with GrSecurity constify plugin. 2012-08-24 08:56:38 -07:00
kernel-bdev-block-device-operations.m4 Only use gcc -Wunused-but-set-variable when available 2013-01-10 16:09:39 -08:00
kernel-bdev-logical-size.m4 Only use gcc -Wunused-but-set-variable when available 2013-01-10 16:09:39 -08:00
kernel-bdev-physical-size.m4 Only use gcc -Wunused-but-set-variable when available 2013-01-10 16:09:39 -08:00
kernel-bdi-setup-and-register.m4 When checking for symbol exports, try compiling. 2012-07-26 13:42:57 -07:00
kernel-bdi.m4 Add backing_device_info per-filesystem 2011-08-04 13:37:38 -07:00
kernel-bio-empty-barrier.m4 Add build system 2010-08-31 13:41:27 -07:00
kernel-bio-end-io-t-args.m4 Fix gcc configure warnings 2011-04-19 10:10:47 -07:00
kernel-bio-failfast.m4 Fix gcc configure warnings 2011-04-19 10:10:47 -07:00
kernel-bio-rw-syncio.m4 Fix gcc configure warnings 2011-04-19 10:10:47 -07:00
kernel-blk-end-request.m4 Only use gcc -Wunused-but-set-variable when available 2013-01-10 16:09:39 -08:00
kernel-blk-fetch-request.m4 Only use gcc -Wunused-but-set-variable when available 2013-01-10 16:09:39 -08:00
kernel-blk-queue-discard.m4 Only use gcc -Wunused-but-set-variable when available 2013-01-10 16:09:39 -08:00
kernel-blk-queue-flush.m4 Only use gcc -Wunused-but-set-variable when available 2013-01-10 16:09:39 -08:00
kernel-blk-queue-io-opt.m4 Only use gcc -Wunused-but-set-variable when available 2013-01-10 16:09:39 -08:00
kernel-blk-queue-max-hw-sectors.m4 Only use gcc -Wunused-but-set-variable when available 2013-01-10 16:09:39 -08:00
kernel-blk-queue-max-segments.m4 Only use gcc -Wunused-but-set-variable when available 2013-01-10 16:09:39 -08:00
kernel-blk-queue-nonrot.m4 Only use gcc -Wunused-but-set-variable when available 2013-01-10 16:09:39 -08:00
kernel-blk-queue-physical-block-size.m4 Only use gcc -Wunused-but-set-variable when available 2013-01-10 16:09:39 -08:00
kernel-blk-requeue-request.m4 Only use gcc -Wunused-but-set-variable when available 2013-01-10 16:09:39 -08:00
kernel-blk-rq-bytes.m4 Only use gcc -Wunused-but-set-variable when available 2013-01-10 16:09:39 -08:00
kernel-blk-rq-pos.m4 Only use gcc -Wunused-but-set-variable when available 2013-01-10 16:09:39 -08:00
kernel-blk-rq-sectors.m4 Only use gcc -Wunused-but-set-variable when available 2013-01-10 16:09:39 -08:00
kernel-blkdev-get-by-path.m4 When checking for symbol exports, try compiling. 2012-07-26 13:42:57 -07:00
kernel-blkdev-get.m4 Move partition scanning from userspace to module. 2012-07-17 09:17:31 -07:00
kernel-check-disk-size-change.m4 When checking for symbol exports, try compiling. 2012-07-26 13:42:57 -07:00
kernel-clear-inode.m4 When checking for symbol exports, try compiling. 2012-07-26 13:42:57 -07:00
kernel-commit-metadata.m4 Implement .commit_metadata hook for NFS export 2012-10-03 10:49:45 -07:00
kernel-create-nameidata.m4 Linux 3.6 compat, iops->create() 2012-10-14 14:42:25 -07:00
kernel-d-make-root.m4 When checking for symbol exports, try compiling. 2012-07-26 13:42:57 -07:00
kernel-d-obtain-alias.m4 When checking for symbol exports, try compiling. 2012-07-26 13:42:57 -07:00
kernel-dentry-operations.m4 Fix false ENOENT on snapshot control dentries 2013-01-16 16:28:54 -08:00
kernel-dirty-inode.m4 Update SAs when an inode is dirtied 2012-12-14 12:18:54 -08:00
kernel-discard-granularity.m4 Set zvol discard_granularity to the volblocksize. 2012-08-07 14:55:31 -07:00
kernel-elevator-change.m4 Only use gcc -Wunused-but-set-variable when available 2013-01-10 16:09:39 -08:00
kernel-encode-fh-inode.m4 Linux 3.5 compat, eops->encode_fh() takes inodes 2012-07-23 12:29:23 -07:00
kernel-evict-inode.m4 Fix build failures on PaX/GRSecurity patched kernels 2012-07-17 09:22:43 -07:00
kernel-fallocate.m4 Fix build failures on PaX/GRSecurity patched kernels 2012-07-17 09:22:43 -07:00
kernel-fmode-t.m4 Fix gcc configure warnings 2011-04-19 10:10:47 -07:00
kernel-fsync.m4 Fix build failures on PaX/GRSecurity patched kernels 2012-07-17 09:22:43 -07:00
kernel-get-disk-ro.m4 Only use gcc -Wunused-but-set-variable when available 2013-01-10 16:09:39 -08:00
kernel-get-gendisk.m4 When checking for symbol exports, try compiling. 2012-07-26 13:42:57 -07:00
kernel-insert-inode-locked.m4 When checking for symbol exports, try compiling. 2012-07-26 13:42:57 -07:00
kernel-invalidate-bdev-args.m4 Fix gcc configure warnings 2011-04-19 10:10:47 -07:00
kernel-kobj-name-len.m4 Fix gcc configure warnings 2011-04-19 10:10:47 -07:00
kernel-lookup-nameidata.m4 Linux 3.6 compat, iops->lookup() 2012-10-14 13:06:54 -07:00
kernel-mkdir-umode-t.m4 Linux 3.6 compat, iops->mkdir() 2012-10-14 15:29:26 -07:00
kernel-mount-nodev.m4 When checking for symbol exports, try compiling. 2012-07-26 13:42:57 -07:00
kernel-open-bdev-exclusive.m4 When checking for symbol exports, try compiling. 2012-07-26 13:42:57 -07:00
kernel-rq-for-each_segment.m4 Only use gcc -Wunused-but-set-variable when available 2013-01-10 16:09:39 -08:00
kernel-rq-is_sync.m4 Only use gcc -Wunused-but-set-variable when available 2013-01-10 16:09:39 -08:00
kernel-security-inode-init.m4 Linux 3.2 compat, security_inode_init_security() 2012-01-12 15:06:39 -08:00
kernel-set-nlink.m4 Linux 3.2 compat: set_nlink() 2011-12-16 20:02:52 -08:00
kernel-sget-args.m4 Linux 3.6 compat, sget() 2012-10-14 13:06:48 -07:00
kernel-show-options.m4 Fix NULL pointer dereference on PaX/GRSecurity patched Linux 3.3 and later kernels 2012-07-20 12:31:45 -07:00
kernel-shrink.m4 Linux 3.1 compat, super_block->s_shrink 2012-01-11 11:46:02 -08:00
kernel-truncate-range.m4 Linux 3.5 compat, iops->truncate_range() removed 2012-07-23 12:29:32 -07:00
kernel-truncate-setsize.m4 When checking for symbol exports, try compiling. 2012-07-26 13:42:57 -07:00
kernel-xattr-handler.m4 Fix gcc configure warnings 2011-04-19 10:10:47 -07:00
kernel.m4 Fix false ENOENT on snapshot control dentries 2013-01-16 16:28:54 -08:00
rpm.am Support building a zfs-modules-dkms sub package 2012-08-08 15:21:01 -07:00
Rules.am Check for -Wno-unused-but-set-variable gcc support 2011-06-14 14:43:22 -07:00
suppressed-warnings.txt Suppress packaging warning 2011-11-08 11:32:04 -08:00
tgz.am Don't build packages that haven't been selected. 2012-07-26 13:39:37 -07:00
user-arch.m4 Add build system 2010-08-31 13:41:27 -07:00
user-frame-larger-than.m4 In autoconf v2.68, AC_LANG_PROGRAM must be quoted 2011-11-28 11:16:33 -08:00
user-ioctl.m4 Add build system 2010-08-31 13:41:27 -07:00
user-libblkid.m4 In autoconf v2.68, AC_LANG_PROGRAM must be quoted 2011-11-28 11:16:33 -08:00
user-libuuid.m4 Add build system 2010-08-31 13:41:27 -07:00
user-nptl_guard_within_stack.m4 In autoconf v2.68, AC_LANG_PROGRAM must be quoted 2011-11-28 11:16:33 -08:00
user-selinux.m4 Autoconf selinux support 2011-01-28 12:45:19 -08:00
user-udev.m4 Move udev rules from /etc/udev to /lib/udev 2011-08-08 16:21:10 -07:00
user-zlib.m4 Add build system 2010-08-31 13:41:27 -07:00
user.m4 Move udev rules from /etc/udev to /lib/udev 2011-08-08 16:21:10 -07:00
zfs-build.m4 Make configure builtin-aware. 2012-07-26 13:40:18 -07:00
zfs-meta.m4 Add build system 2010-08-31 13:41:27 -07:00