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Linux 4.5: don't access i_mutex directly

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Linux commit 5955102c, in preparation for future work, introduced
wrapper functions to lock/unlock inode mutexes.  This is to
prepare for converting it to a read-write semaphore, so that
lookup can be done with only the shared lock held.

Adopt the afs_linux_*lock_inode() functions accordingly, and
convert afs_linux_fsync() to using those wrappers, since the
FOP_FSYNC_TAKES_RANGE case appears to be the current case.

Amusingly, afs_linux_*lock_inode() already have a branch to
handle the case when inode serialization is protected by a
semaphore; it seems that this is going to come full-circle.

Change-Id: Ia5a194acc559de21808655ef066151a0a3826364
Reviewed-on: https://gerrit.openafs.org/12268
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Joe Gorse <jhgorse@gmail.com>
Tested-by: Joe Gorse <jhgorse@gmail.com>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
This commit is contained in:
Benjamin Kaduk 2016-05-01 19:48:40 -04:00
parent 2ef27ea1bb
commit 360f4ef53c
3 changed files with 11 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
acinclude.m4
View File

@ -1098,6 +1098,9 @@ case $AFS_SYSNAME in *_linux* | *_umlinux*)
AC_CHECK_LINUX_FUNC([inode_nohighmem],
[#include <linux/fs.h>],
[inode_nohighmem(NULL);])
AC_CHECK_LINUX_FUNC([inode_lock],
[#include <linux/fs.h>],
[inode_lock(NULL);])
dnl Consequences - things which get set as a result of the
dnl above tests

8
src/afs/LINUX/osi_compat.h
View File

@ -445,7 +445,9 @@ afs_init_sb_export_ops(struct super_block *sb) {
static inline void
afs_linux_lock_inode(struct inode *ip) {
#ifdef STRUCT_INODE_HAS_I_MUTEX
#if defined(HAVE_LINUX_INODE_LOCK)
inode_lock(ip);
#elif defined(STRUCT_INODE_HAS_I_MUTEX)
mutex_lock(&ip->i_mutex);
#else
down(&ip->i_sem);
@ -454,7 +456,9 @@ afs_linux_lock_inode(struct inode *ip) {
static inline void
afs_linux_unlock_inode(struct inode *ip) {
#ifdef STRUCT_INODE_HAS_I_MUTEX
#if defined(HAVE_LINUX_INODE_LOCK)
inode_unlock(ip);
#elif defined(STRUCT_INODE_HAS_I_MUTEX)
mutex_unlock(&ip->i_mutex);
#else
up(&ip->i_sem);

4
src/afs/LINUX/osi_vnodeops.c
View File

@ -583,13 +583,13 @@ afs_linux_fsync(struct file *fp, int datasync)
cred_t *credp = crref();
#if defined(FOP_FSYNC_TAKES_RANGE)
mutex_lock(&ip->i_mutex);
afs_linux_lock_inode(ip);
#endif
AFS_GLOCK();
code = afs_fsync(VTOAFS(ip), credp);
AFS_GUNLOCK();
#if defined(FOP_FSYNC_TAKES_RANGE)
mutex_unlock(&ip->i_mutex);
afs_linux_unlock_inode(ip);
#endif
crfree(credp);
return afs_convert_code(code);