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kernel: implement RENAME_EXCHANGE support for jffs2 - overlayfs requires it

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Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 45580
v19.07.3_mercusys_ac12_duma
Felix Fietkau 9 years ago
parent 63bb07b28c
commit 51d0476ab0
2 changed files with 116 additions and 0 deletions
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58
target/linux/generic/patches-3.18/111-jffs2-add-RENAME_EXCHANGE-support.patch
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@ -0,0 +1,58 @@
From: Felix Fietkau <nbd@openwrt.org>
Date: Sat, 25 Apr 2015 12:41:32 +0200
Subject: [PATCH] jffs2: add RENAME_EXCHANGE support
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
---
--- a/fs/jffs2/dir.c
+++ b/fs/jffs2/dir.c
@@ -784,7 +784,7 @@ static int jffs2_rename (struct inode *o
uint8_t type;
uint32_t now;
- if (flags & ~RENAME_WHITEOUT)
+ if (flags & ~(RENAME_WHITEOUT | RENAME_EXCHANGE))
return -EINVAL;
/* The VFS will check for us and prevent trying to rename a
@@ -792,7 +792,7 @@ static int jffs2_rename (struct inode *o
* the VFS can't check whether the victim is empty. The filesystem
* needs to do that for itself.
*/
- if (new_dentry->d_inode) {
+ if (new_dentry->d_inode && !(flags & RENAME_EXCHANGE)) {
victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
if (S_ISDIR(new_dentry->d_inode->i_mode)) {
struct jffs2_full_dirent *fd;
@@ -827,7 +827,7 @@ static int jffs2_rename (struct inode *o
if (ret)
return ret;
- if (victim_f) {
+ if (victim_f && !(flags & RENAME_EXCHANGE)) {
/* There was a victim. Kill it off nicely */
if (S_ISDIR(new_dentry->d_inode->i_mode))
clear_nlink(new_dentry->d_inode);
@@ -853,6 +853,12 @@ static int jffs2_rename (struct inode *o
if (flags & RENAME_WHITEOUT)
/* Replace with whiteout */
ret = jffs2_whiteout(old_dir_i, old_dentry);
+ else if (flags & RENAME_EXCHANGE)
+ /* Replace the original */
+ ret = jffs2_do_link(c, JFFS2_INODE_INFO(old_dir_i),
+ new_dentry->d_inode->i_ino, type,
+ old_dentry->d_name.name, old_dentry->d_name.len,
+ now);
else
/* Unlink the original */
ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
@@ -879,7 +885,7 @@ static int jffs2_rename (struct inode *o
return ret;
}
- if (S_ISDIR(old_dentry->d_inode->i_mode))
+ if (S_ISDIR(old_dentry->d_inode->i_mode) && !(flags & RENAME_EXCHANGE))
drop_nlink(old_dir_i);
new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);

58
target/linux/generic/patches-4.0/111-jffs2-add-RENAME_EXCHANGE-support.patch
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@ -0,0 +1,58 @@
From: Felix Fietkau <nbd@openwrt.org>
Date: Sat, 25 Apr 2015 12:41:32 +0200
Subject: [PATCH] jffs2: add RENAME_EXCHANGE support
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
---
--- a/fs/jffs2/dir.c
+++ b/fs/jffs2/dir.c
@@ -784,7 +784,7 @@ static int jffs2_rename (struct inode *o
uint8_t type;
uint32_t now;
- if (flags & ~RENAME_WHITEOUT)
+ if (flags & ~(RENAME_WHITEOUT | RENAME_EXCHANGE))
return -EINVAL;
/* The VFS will check for us and prevent trying to rename a
@@ -792,7 +792,7 @@ static int jffs2_rename (struct inode *o
* the VFS can't check whether the victim is empty. The filesystem
* needs to do that for itself.
*/
- if (new_dentry->d_inode) {
+ if (new_dentry->d_inode && !(flags & RENAME_EXCHANGE)) {
victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
if (d_is_dir(new_dentry)) {
struct jffs2_full_dirent *fd;
@@ -827,7 +827,7 @@ static int jffs2_rename (struct inode *o
if (ret)
return ret;
- if (victim_f) {
+ if (victim_f && !(flags & RENAME_EXCHANGE)) {
/* There was a victim. Kill it off nicely */
if (d_is_dir(new_dentry))
clear_nlink(new_dentry->d_inode);
@@ -853,6 +853,12 @@ static int jffs2_rename (struct inode *o
if (flags & RENAME_WHITEOUT)
/* Replace with whiteout */
ret = jffs2_whiteout(old_dir_i, old_dentry);
+ else if (flags & RENAME_EXCHANGE)
+ /* Replace the original */
+ ret = jffs2_do_link(c, JFFS2_INODE_INFO(old_dir_i),
+ new_dentry->d_inode->i_ino, type,
+ old_dentry->d_name.name, old_dentry->d_name.len,
+ now);
else
/* Unlink the original */
ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
@@ -879,7 +885,7 @@ static int jffs2_rename (struct inode *o
return ret;
}
- if (d_is_dir(old_dentry))
+ if (d_is_dir(old_dentry) && !(flags & RENAME_EXCHANGE))
drop_nlink(old_dir_i);
new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);
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