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Increase mnt_noasync once in softdep_mount() to disallow async io,

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closing a window where a file system using softupdates could be async
for a short while if both MNT_UPDATE and MNT_ASYNC were passed as flags
to nmount().  Add MNTK_SOFTDEP flag to ensure that softdep_mount()
doesn't increase mnt_noasync multiple times.
This commit is contained in:
tegge 2006-09-26 04:17:17 +00:00
parent f42473d76b
commit 431fd40aef
2 changed files with 6 additions and 0 deletions
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1
sys/sys/mount.h
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@ -305,6 +305,7 @@ void __mnt_vnode_markerfree(struct vnode **mvp, struct mount *mp);
*/
#define MNTK_UNMOUNTF 0x00000001 /* forced unmount in progress */
#define MNTK_ASYNC 0x00000002 /* filtered async flag */
#define MNTK_SOFTDEP 0x00000004 /* async disabled by softdep */
#define MNTK_UNMOUNT 0x01000000 /* unmount in progress */
#define MNTK_MWAIT 0x02000000 /* waiting for unmount to finish */
#define MNTK_SUSPEND 0x08000000 /* request write suspension */

5
sys/ufs/ffs/ffs_softdep.c
View File

@ -1426,6 +1426,11 @@ softdep_mount(devvp, mp, fs, cred)
MNT_ILOCK(mp);
mp->mnt_flag &= ~MNT_ASYNC;
mp->mnt_flag |= MNT_SOFTDEP;
if ((mp->mnt_kern_flag & MNTK_SOFTDEP) == 0) {
mp->mnt_kern_flag = (mp->mnt_kern_flag & ~MNTK_ASYNC) |
MNTK_SOFTDEP;
mp->mnt_noasync++;
}
MNT_IUNLOCK(mp);
ump = VFSTOUFS(mp);
LIST_INIT(&ump->softdep_workitem_pending);