diff options
Diffstat (limited to 'sys/kern/vfs_bio.c')
| -rw-r--r-- | sys/kern/vfs_bio.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/sys/kern/vfs_bio.c b/sys/kern/vfs_bio.c index f250367..29646d9 100644 --- a/sys/kern/vfs_bio.c +++ b/sys/kern/vfs_bio.c @@ -2271,9 +2271,21 @@ loop: * to softupdates re-dirtying the buffer. In the latter * case, B_CACHE is set after the first write completes, * preventing further loops. + * NOTE! b*write() sets B_CACHE. If we cleared B_CACHE + * above while extending the buffer, we cannot allow the + * buffer to remain with B_CACHE set after the write + * completes or it will represent a corrupt state. To + * deal with this we set B_NOCACHE to scrap the buffer + * after the write. + * + * We might be able to do something fancy, like setting + * B_CACHE in bwrite() except if B_DELWRI is already set, + * so the below call doesn't set B_CACHE, but that gets real + * confusing. This is much easier. */ if ((bp->b_flags & (B_CACHE|B_DELWRI)) == B_DELWRI) { + bp->b_flags |= B_NOCACHE; BUF_WRITE(bp); goto loop; } |
