1 files changed, 42 insertions, 0 deletions

diff --git a/fs/jffs2/nodemgmt.c b/fs/jffs2/nodemgmt.c
index 6784d1e7a7eb..0c96eb52c797 100644
--- a/fs/jffs2/nodemgmt.c
+++ b/fs/jffs2/nodemgmt.c
@@ -18,6 +18,37 @@
 #include "nodelist.h"
 #include "debug.h"
 
+/*
+ * Check whether the user is allowed to write.
+ */
+static int jffs2_rp_can_write(struct jffs2_sb_info *c)
+{
+        uint32_t avail;
+        struct jffs2_mount_opts *opts = &c->mount_opts;
+
+        avail = c->dirty_size + c->free_size + c->unchecked_size +
+                c->erasing_size - c->resv_blocks_write * c->sector_size
+                - c->nospc_dirty_size;
+
+        if (avail < 2 * opts->rp_size)
+                jffs2_dbg(1, "rpsize %u, dirty_size %u, free_size %u, "
+                          "erasing_size %u, unchecked_size %u, "
+                          "nr_erasing_blocks %u, avail %u, resrv %u\n",
+                          opts->rp_size, c->dirty_size, c->free_size,
+                          c->erasing_size, c->unchecked_size,
+                          c->nr_erasing_blocks, avail, c->nospc_dirty_size);
+
+        if (avail > opts->rp_size)
+                return 1;
+
+        /* Always allow root */
+        if (capable(CAP_SYS_RESOURCE))
+                return 1;
+
+        jffs2_dbg(1, "forbid writing\n");
+        return 0;
+}
+
 /**
  *      jffs2_reserve_space - request physical space to write nodes to flash
  *      @c: superblock info
@@ -55,6 +86,15 @@ int jffs2_reserve_space(struct jffs2_sb_info *c, uint32_t minsize,
 
         spin_lock(&c->erase_completion_lock);
 
+        /*
+         * Check if the free space is greater then size of the reserved pool.
+         * If not, only allow root to proceed with writing.
+         */
+        if (prio != ALLOC_DELETION && !jffs2_rp_can_write(c)) {
+                ret = -ENOSPC;
+                goto out;
+        }
+
         /* this needs a little more thought (true <tglx> :)) */
         while(ret == -EAGAIN) {
                 while(c->nr_free_blocks + c->nr_erasing_blocks < blocksneeded) {
@@ -158,6 +198,8 @@ int jffs2_reserve_space(struct jffs2_sb_info *c, uint32_t minsize,
                         jffs2_dbg(1, "%s(): ret is %d\n", __func__, ret);
                 }
         }
+
+out:
         spin_unlock(&c->erase_completion_lock);
         if (!ret)
                 ret = jffs2_prealloc_raw_node_refs(c, c->nextblock, 1);