From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/fs/ext4/fast_commit.c | 49 +++++++++++++++++++++++++++++++------------------
1 files changed, 31 insertions(+), 18 deletions(-)
diff --git a/kernel/fs/ext4/fast_commit.c b/kernel/fs/ext4/fast_commit.c
index 41dcf21..be768ef 100644
--- a/kernel/fs/ext4/fast_commit.c
+++ b/kernel/fs/ext4/fast_commit.c
@@ -66,7 +66,7 @@
* Fast Commit Ineligibility
* -------------------------
* Not all operations are supported by fast commits today (e.g extended
- * attributes). Fast commit ineligiblity is marked by calling one of the
+ * attributes). Fast commit ineligibility is marked by calling one of the
* two following functions:
*
* - ext4_fc_mark_ineligible(): This makes next fast commit operation to fall
@@ -371,25 +371,33 @@
struct __track_dentry_update_args *dentry_update =
(struct __track_dentry_update_args *)arg;
struct dentry *dentry = dentry_update->dentry;
- struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
+ struct inode *dir = dentry->d_parent->d_inode;
+ struct super_block *sb = inode->i_sb;
+ struct ext4_sb_info *sbi = EXT4_SB(sb);
mutex_unlock(&ei->i_fc_lock);
+
+ if (IS_ENCRYPTED(dir)) {
+ ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_ENCRYPTED_FILENAME);
+ mutex_lock(&ei->i_fc_lock);
+ return -EOPNOTSUPP;
+ }
+
node = kmem_cache_alloc(ext4_fc_dentry_cachep, GFP_NOFS);
if (!node) {
- ext4_fc_mark_ineligible(inode->i_sb, EXT4_FC_REASON_NOMEM);
+ ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_NOMEM);
mutex_lock(&ei->i_fc_lock);
return -ENOMEM;
}
node->fcd_op = dentry_update->op;
- node->fcd_parent = dentry->d_parent->d_inode->i_ino;
+ node->fcd_parent = dir->i_ino;
node->fcd_ino = inode->i_ino;
if (dentry->d_name.len > DNAME_INLINE_LEN) {
node->fcd_name.name = kmalloc(dentry->d_name.len, GFP_NOFS);
if (!node->fcd_name.name) {
kmem_cache_free(ext4_fc_dentry_cachep, node);
- ext4_fc_mark_ineligible(inode->i_sb,
- EXT4_FC_REASON_NOMEM);
+ ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_NOMEM);
mutex_lock(&ei->i_fc_lock);
return -ENOMEM;
}
@@ -628,6 +636,9 @@
*crc = ext4_chksum(sbi, *crc, tl, sizeof(*tl));
if (pad_len > 0)
ext4_fc_memzero(sb, tl + 1, pad_len, crc);
+ /* Don't leak uninitialized memory in the unused last byte. */
+ *((u8 *)(tl + 1) + pad_len) = 0;
+
ext4_fc_submit_bh(sb);
ret = jbd2_fc_get_buf(EXT4_SB(sb)->s_journal, &bh);
@@ -684,6 +695,8 @@
dst += sizeof(tail.fc_tid);
tail.fc_crc = cpu_to_le32(crc);
ext4_fc_memcpy(sb, dst, &tail.fc_crc, sizeof(tail.fc_crc), NULL);
+ dst += sizeof(tail.fc_crc);
+ memset(dst, 0, bsize - off); /* Don't leak uninitialized memory. */
ext4_fc_submit_bh(sb);
@@ -1287,7 +1300,7 @@
return 0;
}
- ret = __ext4_unlink(NULL, old_parent, &entry, inode);
+ ret = __ext4_unlink(old_parent, &entry, inode, NULL);
/* -ENOENT ok coz it might not exist anymore. */
if (ret == -ENOENT)
ret = 0;
@@ -2137,17 +2150,17 @@
journal->j_fc_cleanup_callback = ext4_fc_cleanup;
}
-static const char *fc_ineligible_reasons[] = {
- "Extended attributes changed",
- "Cross rename",
- "Journal flag changed",
- "Insufficient memory",
- "Swap boot",
- "Resize",
- "Dir renamed",
- "Falloc range op",
- "Data journalling",
- "FC Commit Failed"
+static const char * const fc_ineligible_reasons[] = {
+ [EXT4_FC_REASON_XATTR] = "Extended attributes changed",
+ [EXT4_FC_REASON_CROSS_RENAME] = "Cross rename",
+ [EXT4_FC_REASON_JOURNAL_FLAG_CHANGE] = "Journal flag changed",
+ [EXT4_FC_REASON_NOMEM] = "Insufficient memory",
+ [EXT4_FC_REASON_SWAP_BOOT] = "Swap boot",
+ [EXT4_FC_REASON_RESIZE] = "Resize",
+ [EXT4_FC_REASON_RENAME_DIR] = "Dir renamed",
+ [EXT4_FC_REASON_FALLOC_RANGE] = "Falloc range op",
+ [EXT4_FC_REASON_INODE_JOURNAL_DATA] = "Data journalling",
+ [EXT4_FC_REASON_ENCRYPTED_FILENAME] = "Encrypted filename",
};
int ext4_fc_info_show(struct seq_file *seq, void *v)
--
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