src/sys/compat/linux/linux_file.c, branch releng/7.3

MFC: Use shared vnode locks when invoking VOP_READDIR().

2009-03-18T21:51:02Z

MFC r188572:

2009-03-04T20:26:39Z

Fix an edge-case of the linux readdir: We need the size of a linux dirent structure, not the size of a pointer to it. PR: 131099 Submitted by: Andreas Kies

Merge r182892 from head to stable/7, I had to manually

2008-09-22T20:19:54Z

change the code to include "thread" argument to the vn_lock() which got removed in HEAD: Getdents requires padding with 2 bytes instead of 1 byte as with getdents64. The last byte is used for storing the d_type, add this to plain getdents case where it was missing before. Also change the code to use strlcpy instead of plain strcpy. This changes fix the getdents crash we had reports about (hl2 server etc.) PR: kern/117010 MFC after: 1 week Submitted by: Dmitry Chagin (dchagin@) Tested by: MITA Yoshio Approved by: kib (mentor) Approved by: re (kensmith)

MFC: Kernel mode Network Lock Manager.

2008-04-10T09:39:29Z

MFC rev. 1.107:

2008-01-03T12:40:55Z

Plug the leaks in the present implementation of the linux_openat(). Approved by: re (kensmith)

Don't add the 'pad' argument to the mmap/truncate/etc syscalls.

2007-07-04T23:06:43Z

Submitted by: kensmith Approved by: re (kensmith)

Ensure that newpath is always initialized, even for the error case.

2007-06-10T04:37:22Z

Replace custom file descriptor array sleep lock constructed using a mutex

2007-04-04T09:11:34Z

and flags with an sxlock. This leads to a significant and measurable performance improvement as a result of access to shared locking for frequent lookup operations, reduced general overhead, and reduced overhead in the event of contention. All of these are imported for threaded applications where simultaneous access to a shared file descriptor array occurs frequently. Kris has reported 2x-4x transaction rate improvements on 8-core MySQL benchmarks; smaller improvements can be expected for many workloads as a result of reduced overhead. - Generally eliminate the distinction between "fast" and regular acquisisition of the filedesc lock; the plan is that they will now all be fast. Change all locking instances to either shared or exclusive locks. - Correct a bug (pointed out by kib) in fdfree() where previously msleep() was called without the mutex held; sx_sleep() is now always called with the sxlock held exclusively. - Universally hold the struct file lock over changes to struct file, rather than the filedesc lock or no lock. Always update the f_ops field last. A further memory barrier is required here in the future (discussed with jhb). - Improve locking and reference management in linux_at(), which fails to properly acquire vnode references before using vnode pointers. Annotate improper use of vn_fullpath(), which will be replaced at a future date. In fcntl(), we conservatively acquire an exclusive lock, even though in some cases a shared lock may be sufficient, which should be revisited. The dropping of the filedesc lock in fdgrowtable() is no longer required as the sxlock can be held over the sleep operation; we should consider removing that (pointed out by attilio). Tested by: kris Discussed with: jhb, kris, attilio, jeff

Implement the openat() linux syscall

2007-03-29T02:11:46Z

Submitted by: Roman Divacky (rdivacky@) MFC after: 2 weeks

Add support for LINUX_O_DIRECT, LINUX_O_DIRECT and LINUX_O_NOFOLLOW flags

2007-01-18T09:32:08Z

to open() [1]. Improve locking for accessing session control structures [2]. Try to document (most likely harmless) races in the code [3]. Based on submission by: Intron (intron at intron ac) [1] Reviewed by: jhb [2] Discussed with: netchild, rwatson, jhb [3]