fuse: avoid scheduling while atomic

As reported by Richard Sharpe, an attempt to use fuse_notify_inval_entry()
triggers complains about scheduling while atomic:

  BUG: scheduling while atomic: fuse.hf/13976/0x10000001

This happens because fuse_notify_inval_entry() attempts to allocate memory
with GFP_KERNEL, holding "struct fuse_copy_state" mapped by kmap_atomic().

Introduced by commit 58bda1da4b3c "fuse/dev: use atomic maps"

Fix by moving the map/unmap to just cover the actual memcpy operation.

Original patch from Maxim Patlasov <mpatlasov@parallels.com>

Reported-by: Richard Sharpe <realrichardsharpe@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Cc: <stable@vger.kernel.org> # v3.15+

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index aac71ce..75fa055 100644 (file)
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -643,9 +643,8 @@ struct fuse_copy_state {
        unsigned long seglen;
        unsigned long addr;
        struct page *pg;
-       void *mapaddr;
-       void *buf;
        unsigned len;
+       unsigned offset;
        unsigned move_pages:1;
 };
 
@@ -666,23 +665,17 @@ static void fuse_copy_finish(struct fuse_copy_state *cs)
        if (cs->currbuf) {
                struct pipe_buffer *buf = cs->currbuf;
 
-               if (!cs->write) {
-                       kunmap_atomic(cs->mapaddr);
-               } else {
-                       kunmap_atomic(cs->mapaddr);
+               if (cs->write)
                        buf->len = PAGE_SIZE - cs->len;
-               }
                cs->currbuf = NULL;
-               cs->mapaddr = NULL;
-       } else if (cs->mapaddr) {
-               kunmap_atomic(cs->mapaddr);
+       } else if (cs->pg) {
                if (cs->write) {
                        flush_dcache_page(cs->pg);
                        set_page_dirty_lock(cs->pg);
                }
                put_page(cs->pg);
-               cs->mapaddr = NULL;
        }
+       cs->pg = NULL;
 }
 
 /*
@@ -691,7 +684,7 @@ static void fuse_copy_finish(struct fuse_copy_state *cs)
  */
 static int fuse_copy_fill(struct fuse_copy_state *cs)
 {
-       unsigned long offset;
+       struct page *page;
        int err;
 
        unlock_request(cs->fc, cs->req);
@@ -706,14 +699,12 @@ static int fuse_copy_fill(struct fuse_copy_state *cs)
 
                        BUG_ON(!cs->nr_segs);
                        cs->currbuf = buf;
-                       cs->mapaddr = kmap_atomic(buf->page);
+                       cs->pg = buf->page;
+                       cs->offset = buf->offset;
                        cs->len = buf->len;
-                       cs->buf = cs->mapaddr + buf->offset;
                        cs->pipebufs++;
                        cs->nr_segs--;
                } else {
-                       struct page *page;
-
                        if (cs->nr_segs == cs->pipe->buffers)
                                return -EIO;
 
@@ -726,8 +717,8 @@ static int fuse_copy_fill(struct fuse_copy_state *cs)
                        buf->len = 0;
 
                        cs->currbuf = buf;
-                       cs->mapaddr = kmap_atomic(page);
-                       cs->buf = cs->mapaddr;
+                       cs->pg = page;
+                       cs->offset = 0;
                        cs->len = PAGE_SIZE;
                        cs->pipebufs++;
                        cs->nr_segs++;
@@ -740,14 +731,13 @@ static int fuse_copy_fill(struct fuse_copy_state *cs)
                        cs->iov++;
                        cs->nr_segs--;
                }
-               err = get_user_pages_fast(cs->addr, 1, cs->write, &cs->pg);
+               err = get_user_pages_fast(cs->addr, 1, cs->write, &page);
                if (err < 0)
                        return err;
                BUG_ON(err != 1);
-               offset = cs->addr % PAGE_SIZE;
-               cs->mapaddr = kmap_atomic(cs->pg);
-               cs->buf = cs->mapaddr + offset;
-               cs->len = min(PAGE_SIZE - offset, cs->seglen);
+               cs->pg = page;
+               cs->offset = cs->addr % PAGE_SIZE;
+               cs->len = min(PAGE_SIZE - cs->offset, cs->seglen);
                cs->seglen -= cs->len;
                cs->addr += cs->len;
        }
@@ -760,15 +750,20 @@ static int fuse_copy_do(struct fuse_copy_state *cs, void **val, unsigned *size)
 {
        unsigned ncpy = min(*size, cs->len);
        if (val) {
+               void *pgaddr = kmap_atomic(cs->pg);
+               void *buf = pgaddr + cs->offset;
+
                if (cs->write)
-                       memcpy(cs->buf, *val, ncpy);
+                       memcpy(buf, *val, ncpy);
                else
-                       memcpy(*val, cs->buf, ncpy);
+                       memcpy(*val, buf, ncpy);
+
+               kunmap_atomic(pgaddr);
                *val += ncpy;
        }
        *size -= ncpy;
        cs->len -= ncpy;
-       cs->buf += ncpy;
+       cs->offset += ncpy;
        return ncpy;
 }
 
@@ -874,8 +869,8 @@ static int fuse_try_move_page(struct fuse_copy_state *cs, struct page **pagep)
 out_fallback_unlock:
        unlock_page(newpage);
 out_fallback:
-       cs->mapaddr = kmap_atomic(buf->page);
-       cs->buf = cs->mapaddr + buf->offset;
+       cs->pg = buf->page;
+       cs->offset = buf->offset;
 
        err = lock_request(cs->fc, cs->req);
        if (err)