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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /fs/efs/symlink.c
Initial import
Diffstat (limited to 'fs/efs/symlink.c')
-rw-r--r--fs/efs/symlink.c54
1 files changed, 54 insertions, 0 deletions
diff --git a/fs/efs/symlink.c b/fs/efs/symlink.c
new file mode 100644
index 000000000..75117d0da
--- /dev/null
+++ b/fs/efs/symlink.c
@@ -0,0 +1,54 @@
+/*
+ * symlink.c
+ *
+ * Copyright (c) 1999 Al Smith
+ *
+ * Portions derived from work (c) 1995,1996 Christian Vogelgsang.
+ */
+
+#include <linux/string.h>
+#include <linux/pagemap.h>
+#include <linux/buffer_head.h>
+#include "efs.h"
+
+static int efs_symlink_readpage(struct file *file, struct page *page)
+{
+ char *link = kmap(page);
+ struct buffer_head * bh;
+ struct inode * inode = page->mapping->host;
+ efs_block_t size = inode->i_size;
+ int err;
+
+ err = -ENAMETOOLONG;
+ if (size > 2 * EFS_BLOCKSIZE)
+ goto fail;
+
+ /* read first 512 bytes of link target */
+ err = -EIO;
+ bh = sb_bread(inode->i_sb, efs_bmap(inode, 0));
+ if (!bh)
+ goto fail;
+ memcpy(link, bh->b_data, (size > EFS_BLOCKSIZE) ? EFS_BLOCKSIZE : size);
+ brelse(bh);
+ if (size > EFS_BLOCKSIZE) {
+ bh = sb_bread(inode->i_sb, efs_bmap(inode, 1));
+ if (!bh)
+ goto fail;
+ memcpy(link + EFS_BLOCKSIZE, bh->b_data, size - EFS_BLOCKSIZE);
+ brelse(bh);
+ }
+ link[size] = '\0';
+ SetPageUptodate(page);
+ kunmap(page);
+ unlock_page(page);
+ return 0;
+fail:
+ SetPageError(page);
+ kunmap(page);
+ unlock_page(page);
+ return err;
+}
+
+const struct address_space_operations efs_symlink_aops = {
+ .readpage = efs_symlink_readpage
+};