Changeset 7bd68e6 in mainline

Timestamp:

2011-04-05T21:07:59Z (13 years ago)

Author:

Maurizio Lombardi <m.lombardi85@…>

Branches:

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

Children:

82c198f

Parents:

2bbbfd3

Message:

Add mfs_inode_grow(), it uses write_map() to expand an inode by a given number of bytes

Location:

uspace/srv/fs/minixfs

Files:

• mfs.h (modified) (1 diff)
• mfs_inode.c (modified) (1 diff)

uspace/srv/fs/minixfs/mfs.h

@@ -163 +163 @@
 put_inode(struct mfs_node *mnode);
 
+int
+mfs_inode_grow(struct mfs_node *mnode, unsigned size_grow);
+
 /*mfs_rw.c*/
 extern int

uspace/srv/fs/minixfs/mfs_inode.c

@@ -271 +271 @@
 }
 
+int
+mfs_inode_grow(struct mfs_node *mnode, unsigned size_grow)
+{
+        unsigned i;
+
+        if (size_grow == 0)
+                return EOK;
+
+        struct mfs_sb_info *sbi = mnode->instance->sbi;
+        struct mfs_ino_info *ino_i = mnode->ino_i;
+        const int bs = sbi->block_size;
+
+        const uint32_t old_size = ino_i->i_size;
+        const uint32_t new_size = old_size + size_grow;
+
+        /*Compute the number of zones to add to the inode*/
+        unsigned zones_to_add = 0;
+        if ((old_size % (bs - 1)) == 0)
+                zones_to_add++;
+
+        zones_to_add += (new_size - old_size) / bs;
+
+        /*Compute the start zone*/
+        unsigned start_zone = old_size / bs;
+        start_zone += (old_size % bs) != 0;
+
+        int r;
+        for (i = 0; i < zones_to_add; ++i) {
+                uint32_t new_zone;
+                uint32_t dummy;
+
+                r = mfs_alloc_bit(mnode->instance, &new_zone, BMAP_ZONE);
+                if (r != EOK)
+                        return r;
+
+                r = write_map(mnode, (start_zone + i) * sbi->block_size,
+                                new_zone, &dummy);
+                if (r != EOK)
+                        return r;
+        }
+        return EOK;
+}
+
 /**
  * @}