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Linux 4.7 compat: use iterate_shared for concurrent readdir

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Register iterate_shared if it exists so the kernel will used shared
lock and allowing concurrent readdir.

Also, use shared lock when doing llseek with SEEK_DATA or SEEK_HOLE
to allow concurrent seeking.

Signed-off-by: Chunwei Chen <david.chen@osnexus.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #4664
Closes #4665
This commit is contained in:
Chunwei Chen
2016-05-18 14:30:20 -07:00
committed by Brian Behlendorf
parent e42d46664e
commit 9baaa7deae
4 changed files with 54 additions and 25 deletions
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include/sys/zpl.h
+1 -1
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@@ -123,7 +123,7 @@ extern const struct inode_operations zpl_ops_snapdirs;
extern const struct file_operations zpl_fops_shares;
extern const struct inode_operations zpl_ops_shares;
#ifdef HAVE_VFS_ITERATE
#if defined(HAVE_VFS_ITERATE) || defined(HAVE_VFS_ITERATE_SHARED)
#define DIR_CONTEXT_INIT(_dirent, _actor, _pos) { \
.actor = _actor, \