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From: Felix Fietkau <nbd@nbd.name>
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Subject: jffs2: use .rename2 and add RENAME_WHITEOUT support
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It is required for renames on overlayfs
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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--- a/fs/jffs2/dir.c
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+++ b/fs/jffs2/dir.c
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@@ -752,6 +752,24 @@ static int jffs2_mknod (struct inode *di
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return ret;
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}
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+static int jffs2_whiteout (struct inode *old_dir, struct dentry *old_dentry)
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+{
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+ struct dentry *wh;
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+ int err;
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+
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+ wh = d_alloc(old_dentry->d_parent, &old_dentry->d_name);
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+ if (!wh)
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+ return -ENOMEM;
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+
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+ err = jffs2_mknod(old_dir, wh, S_IFCHR | WHITEOUT_MODE,
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+ WHITEOUT_DEV);
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+ if (err)
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+ return err;
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+
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+ d_rehash(wh);
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+ return 0;
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+}
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+
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static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
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struct inode *new_dir_i, struct dentry *new_dentry,
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unsigned int flags)
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@@ -762,7 +780,7 @@ static int jffs2_rename (struct inode *o
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uint8_t type;
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uint32_t now;
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- if (flags & ~RENAME_NOREPLACE)
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+ if (flags & ~(RENAME_NOREPLACE|RENAME_WHITEOUT))
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return -EINVAL;
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/* The VFS will check for us and prevent trying to rename a
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@@ -828,9 +846,14 @@ static int jffs2_rename (struct inode *o
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if (d_is_dir(old_dentry) && !victim_f)
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inc_nlink(new_dir_i);
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- /* Unlink the original */
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- ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
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- old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
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+ if (flags & RENAME_WHITEOUT)
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+ /* Replace with whiteout */
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+ ret = jffs2_whiteout(old_dir_i, old_dentry);
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+ else
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+ /* Unlink the original */
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+ ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
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+ old_dentry->d_name.name,
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+ old_dentry->d_name.len, NULL, now);
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/* We don't touch inode->i_nlink */
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