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| author | Miklos Szeredi <mszeredi@suse.cz> | 2010-07-12 14:41:40 +0200 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@suse.cz> | 2010-07-12 14:41:40 +0200 |
| commit | 7909b1c64078087ac153fb47a2f50793fe3ee7d0 (patch) | |
| tree | 83367ca6286f3ebfee8b94533152848e7529e9fb /fs/fuse | |
| parent | 815c4163b6c8ebf8152f42b0a5fd015cfdcedc78 (diff) | |
| download | linux-7909b1c64078087ac153fb47a2f50793fe3ee7d0.tar.bz2 | |
fuse: don't use atomic kmap
Don't use atomic kmap for mapping userspace buffers in device
read/write/splice.
This is necessary because the next patch (adding store notify)
requires that caller of fuse_copy_page() may sleep between
invocations. The simplest way to ensure this is to change the atomic
kmaps to non-atomic ones.
Thankfully architectures where kmap() is not a no-op are going out of
fashion, so we can ignore the (probably negligible) performance impact
of this change.
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Diffstat (limited to 'fs/fuse')
| -rw-r--r-- | fs/fuse/dev.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c index 9424796d6634..7eb80d33c4f3 100644 --- a/fs/fuse/dev.c +++ b/fs/fuse/dev.c @@ -535,13 +535,13 @@ static void fuse_copy_finish(struct fuse_copy_state *cs) if (!cs->write) { buf->ops->unmap(cs->pipe, buf, cs->mapaddr); } else { - kunmap_atomic(cs->mapaddr, KM_USER0); + kunmap(buf->page); buf->len = PAGE_SIZE - cs->len; } cs->currbuf = NULL; cs->mapaddr = NULL; } else if (cs->mapaddr) { - kunmap_atomic(cs->mapaddr, KM_USER0); + kunmap(cs->pg); if (cs->write) { flush_dcache_page(cs->pg); set_page_dirty_lock(cs->pg); @@ -572,7 +572,7 @@ static int fuse_copy_fill(struct fuse_copy_state *cs) BUG_ON(!cs->nr_segs); cs->currbuf = buf; - cs->mapaddr = buf->ops->map(cs->pipe, buf, 1); + cs->mapaddr = buf->ops->map(cs->pipe, buf, 0); cs->len = buf->len; cs->buf = cs->mapaddr + buf->offset; cs->pipebufs++; @@ -592,7 +592,7 @@ static int fuse_copy_fill(struct fuse_copy_state *cs) buf->len = 0; cs->currbuf = buf; - cs->mapaddr = kmap_atomic(page, KM_USER0); + cs->mapaddr = kmap(page); cs->buf = cs->mapaddr; cs->len = PAGE_SIZE; cs->pipebufs++; @@ -611,7 +611,7 @@ static int fuse_copy_fill(struct fuse_copy_state *cs) return err; BUG_ON(err != 1); offset = cs->addr % PAGE_SIZE; - cs->mapaddr = kmap_atomic(cs->pg, KM_USER0); + cs->mapaddr = kmap(cs->pg); cs->buf = cs->mapaddr + offset; cs->len = min(PAGE_SIZE - offset, cs->seglen); cs->seglen -= cs->len; |