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Since ufs_ihashget can block, the lock must be checked for each time

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the function returns. Also, moved lock into .bss and made minor cosmetic
changes.

Submitted by:	Bruce Evans
This commit is contained in:
David Greenman 1995-07-21 16:20:20 +00:00
parent d83f358fa3
commit 8997d94f79
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=9618
1 changed files with 8 additions and 14 deletions
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22
sys/ufs/ffs/ffs_vfsops.c
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@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)ffs_vfsops.c 8.8 (Berkeley) 4/18/94
* $Id: ffs_vfsops.c,v 1.23 1995/07/13 08:48:05 davidg Exp $
* $Id: ffs_vfsops.c,v 1.24 1995/07/21 03:52:40 davidg Exp $
*/
#include <sys/param.h>
@ -737,8 +737,7 @@ loop:
* return the inode locked. Detection and handling of mount points must be
* done by the calling routine.
*/
int ffs_inode_hash_lock = 0;
int ffs_inode_hash_lock;
int
ffs_vget(mp, ino, vpp)
@ -756,12 +755,13 @@ ffs_vget(mp, ino, vpp)
ump = VFSTOUFS(mp);
dev = ump->um_dev;
restart:
if ((*vpp = ufs_ihashget(dev, ino)) != NULL)
return (0);
/*
* Lockout the creation of new entries in the FFS hash table
* in case getnewvnode/MALLOC blocks, otherwise a duplicate
* Lock out the creation of new entries in the FFS hash table in
* case getnewvnode() or MALLOC() blocks, otherwise a duplicate
* may occur!
*/
if (ffs_inode_hash_lock) {
@ -769,17 +769,15 @@ ffs_vget(mp, ino, vpp)
ffs_inode_hash_lock = -1;
tsleep(&ffs_inode_hash_lock, PVM, "ffsvgt", 0);
}
if ((*vpp = ufs_ihashget(dev, ino)) != NULL)
return (0);
goto restart;
}
ffs_inode_hash_lock = 1;
/* Allocate a new vnode/inode. */
error = getnewvnode(VT_UFS, mp, ffs_vnodeop_p, &vp);
if (error) {
if (ffs_inode_hash_lock < 0) {
if (ffs_inode_hash_lock < 0)
wakeup(&ffs_inode_hash_lock);
}
ffs_inode_hash_lock = 0;
*vpp = NULL;
return (error);
@ -807,12 +805,8 @@ ffs_vget(mp, ino, vpp)
*/
ufs_ihashins(ip);
/*
* Wakeup anybody blocked on our lock
*/
if (ffs_inode_hash_lock < 0) {
if (ffs_inode_hash_lock < 0)
wakeup(&ffs_inode_hash_lock);
}
ffs_inode_hash_lock = 0;
/* Read in the disk contents for the inode, copy into the inode. */