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authorSascha Hauer <s.hauer@pengutronix.de>2018-09-07 15:36:26 +0300
committerRichard Weinberger <richard@nod.at>2018-10-23 14:48:17 +0300
commit0e26b6e2551e21df72c140e46819523e1b686009 (patch)
tree10704f3951b94efcd5cad1cba250afd8d0920564 /fs/ubifs/lpt.c
parent22ceaa8c688d0c8a6fc6eb7ebf32c01914220d0a (diff)
downloadlinux-0e26b6e2551e21df72c140e46819523e1b686009.tar.xz
ubifs: Export pnode_lookup as ubifs_pnode_lookup
ubifs_lpt_lookup could be implemented using pnode_lookup. To make that possible move pnode_lookup from lpt.c to lpt_commit.c. Rename it to ubifs_pnode_lookup since it's now exported. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'fs/ubifs/lpt.c')
-rw-r--r--fs/ubifs/lpt.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/fs/ubifs/lpt.c b/fs/ubifs/lpt.c
index 31393370e334..ed0c67fe7500 100644
--- a/fs/ubifs/lpt.c
+++ b/fs/ubifs/lpt.c
@@ -1439,6 +1439,38 @@ struct ubifs_pnode *ubifs_get_pnode(struct ubifs_info *c,
}
/**
+ * ubifs_pnode_lookup - lookup a pnode in the LPT.
+ * @c: UBIFS file-system description object
+ * @i: pnode number (0 to (main_lebs - 1) / UBIFS_LPT_FANOUT)
+ *
+ * This function returns a pointer to the pnode on success or a negative
+ * error code on failure.
+ */
+struct ubifs_pnode *ubifs_pnode_lookup(struct ubifs_info *c, int i)
+{
+ int err, h, iip, shft;
+ struct ubifs_nnode *nnode;
+
+ if (!c->nroot) {
+ err = ubifs_read_nnode(c, NULL, 0);
+ if (err)
+ return ERR_PTR(err);
+ }
+ i <<= UBIFS_LPT_FANOUT_SHIFT;
+ nnode = c->nroot;
+ shft = c->lpt_hght * UBIFS_LPT_FANOUT_SHIFT;
+ for (h = 1; h < c->lpt_hght; h++) {
+ iip = ((i >> shft) & (UBIFS_LPT_FANOUT - 1));
+ shft -= UBIFS_LPT_FANOUT_SHIFT;
+ nnode = ubifs_get_nnode(c, nnode, iip);
+ if (IS_ERR(nnode))
+ return ERR_CAST(nnode);
+ }
+ iip = ((i >> shft) & (UBIFS_LPT_FANOUT - 1));
+ return ubifs_get_pnode(c, nnode, iip);
+}
+
+/**
* ubifs_lpt_lookup - lookup LEB properties in the LPT.
* @c: UBIFS file-system description object
* @lnum: LEB number to lookup