Changeset 8a49fed in mainline for uspace/srv/fs/minixfs/mfs_inode.c

Timestamp:

2011-04-30T11:45:33Z (13 years ago)

Author:

Maurizio Lombardi <m.lombardi85@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

44c6091f

Parents:

2874547

Message:

Added implementation of mfs_truncate(), it does not prune indirect blocks yet.

File:

• uspace/srv/fs/minixfs/mfs_inode.c (modified) (1 diff)

uspace/srv/fs/minixfs/mfs_inode.c

@@ -302 +302 @@
 
 int
+inode_shrink(struct mfs_node *mnode, size_t size_shrink)
+{
+        struct mfs_sb_info *sbi = mnode->instance->sbi;
+        struct mfs_ino_info *ino_i = mnode->ino_i;
+        const size_t bs = sbi->block_size;
+        int r;
+
+        assert(size_shrink > 0);
+
+        const size_t old_size = ino_i->i_size;
+        const size_t new_size = ino_i->i_size - size_shrink;
+
+        assert(size_shrink <= old_size);
+
+        ino_i->dirty = true;
+
+        /*Compute the number of zones to free*/
+        unsigned zones_to_free = 0;
+        if (new_size == 0)
+                ++zones_to_free;
+
+        zones_to_free += (old_size / bs) - (new_size / bs);
+
+        mfsdebug("zones to free = %u\n", zones_to_free);
+
+        uint32_t pos = old_size - 1;
+        unsigned i;
+        for (i = 0; i < zones_to_free; ++i, pos -= bs) {
+                uint32_t old_zone;
+
+                r = write_map(mnode, pos, 0, &old_zone);
+                on_error(r, goto exit_error);
+
+                ino_i->i_size -= bs;
+
+                if (old_zone == 0)
+                        continue; /*Sparse block*/
+
+                r = mfs_free_bit(mnode->instance, old_zone, BMAP_ZONE);
+                on_error(r, goto exit_error);
+        }
+
+        ino_i->i_size = new_size;
+        return EOK;
+
+exit_error:
+        return r;
+}
+
+int
 inode_grow(struct mfs_node *mnode, size_t size_grow)
 {