| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <20221031192416.32917-2-daeho43@gmail.com>
Date: Mon, 31 Oct 2022 12:24:16 -0700
From: Daeho Jeong <daeho43@...il.com>
To: linux-kernel@...r.kernel.org,
linux-f2fs-devel@...ts.sourceforge.net, kernel-team@...roid.com
Cc: Daeho Jeong <daehojeong@...gle.com>
Subject: [PATCH v6 2/2] f2fs: introduce F2FS_IOC_START_ATOMIC_REPLACE
From: Daeho Jeong <daehojeong@...gle.com>
introduce a new ioctl to replace the whole content of a file atomically,
which means it induces truncate and content update at the same time.
We can start it with F2FS_IOC_START_ATOMIC_REPLACE and complete it with
F2FS_IOC_COMMIT_ATOMIC_WRITE. Or abort it with
F2FS_IOC_ABORT_ATOMIC_WRITE.
Signed-off-by: Daeho Jeong <daehojeong@...gle.com>
---
v3: move i_size change after setting atomic write flag
v2: add undefined ioctl number reported by <lkp@...el.com>
---
fs/f2fs/data.c | 3 +++
fs/f2fs/f2fs.h | 1 +
fs/f2fs/file.c | 20 ++++++++++++++------
fs/f2fs/segment.c | 14 +++++++++++++-
include/uapi/linux/f2fs.h | 1 +
5 files changed, 32 insertions(+), 7 deletions(-)
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 5f895ddcd64a..bce4dcc3ad78 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -3457,6 +3457,9 @@ static int prepare_atomic_write_begin(struct f2fs_sb_info *sbi,
else if (*blk_addr != NULL_ADDR)
return 0;
+ if (is_inode_flag_set(inode, FI_ATOMIC_REPLACE))
+ goto reserve_block;
+
/* Look for the block in the original inode */
err = __find_data_block(inode, index, &ori_blk_addr);
if (err)
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index e29f9adf60ca..d513ecd17550 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -765,6 +765,7 @@ enum {
FI_ALIGNED_WRITE, /* enable aligned write */
FI_COW_FILE, /* indicate COW file */
FI_ATOMIC_COMMITTED, /* indicate atomic commit completed except disk sync */
+ FI_ATOMIC_REPLACE, /* indicate atomic replace */
FI_MAX, /* max flag, never be used */
};
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 7ce629c95f4a..7b2d956bc52f 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1984,7 +1984,7 @@ static int f2fs_ioc_getversion(struct file *filp, unsigned long arg)
return put_user(inode->i_generation, (int __user *)arg);
}
-static int f2fs_ioc_start_atomic_write(struct file *filp)
+static int f2fs_ioc_start_atomic_write(struct file *filp, bool truncate)
{
struct inode *inode = file_inode(filp);
struct user_namespace *mnt_userns = file_mnt_user_ns(filp);
@@ -2053,10 +2053,6 @@ static int f2fs_ioc_start_atomic_write(struct file *filp)
f2fs_write_inode(inode, NULL);
- isize = i_size_read(inode);
- fi->original_i_size = isize;
- f2fs_i_size_write(fi->cow_inode, isize);
-
stat_inc_atomic_inode(inode);
set_inode_flag(inode, FI_ATOMIC_FILE);
@@ -2064,6 +2060,16 @@ static int f2fs_ioc_start_atomic_write(struct file *filp)
clear_inode_flag(fi->cow_inode, FI_INLINE_DATA);
f2fs_up_write(&fi->i_gc_rwsem[WRITE]);
+ isize = i_size_read(inode);
+ fi->original_i_size = isize;
+ if (truncate) {
+ set_inode_flag(inode, FI_ATOMIC_REPLACE);
+ truncate_inode_pages_final(inode->i_mapping);
+ f2fs_i_size_write(inode, 0);
+ isize = 0;
+ }
+ f2fs_i_size_write(fi->cow_inode, isize);
+
f2fs_update_time(sbi, REQ_TIME);
fi->atomic_write_task = current;
stat_update_max_atomic_write(inode);
@@ -4089,7 +4095,9 @@ static long __f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
case FS_IOC_GETVERSION:
return f2fs_ioc_getversion(filp, arg);
case F2FS_IOC_START_ATOMIC_WRITE:
- return f2fs_ioc_start_atomic_write(filp);
+ return f2fs_ioc_start_atomic_write(filp, false);
+ case F2FS_IOC_START_ATOMIC_REPLACE:
+ return f2fs_ioc_start_atomic_write(filp, true);
case F2FS_IOC_COMMIT_ATOMIC_WRITE:
return f2fs_ioc_commit_atomic_write(filp);
case F2FS_IOC_ABORT_ATOMIC_WRITE:
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 9cbf88092c78..7f62118cbe6e 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -261,14 +261,26 @@ static void __complete_revoke_list(struct inode *inode, struct list_head *head,
bool revoke)
{
struct revoke_entry *cur, *tmp;
+ pgoff_t start_index = 0;
+ bool truncate = is_inode_flag_set(inode, FI_ATOMIC_REPLACE);
list_for_each_entry_safe(cur, tmp, head, list) {
- if (revoke)
+ if (revoke) {
__replace_atomic_write_block(inode, cur->index,
cur->old_addr, NULL, true);
+ } else if (truncate) {
+ f2fs_truncate_hole(inode, start_index, cur->index);
+ start_index = cur->index + 1;
+ }
+
list_del(&cur->list);
kmem_cache_free(revoke_entry_slab, cur);
}
+
+ if (!revoke && truncate) {
+ f2fs_do_truncate_blocks(inode, start_index * PAGE_SIZE, false);
+ clear_inode_flag(inode, FI_ATOMIC_REPLACE);
+ }
}
static int __f2fs_commit_atomic_write(struct inode *inode)
diff --git a/include/uapi/linux/f2fs.h b/include/uapi/linux/f2fs.h
index 3121d127d5aa..955d440be104 100644
--- a/include/uapi/linux/f2fs.h
+++ b/include/uapi/linux/f2fs.h
@@ -42,6 +42,7 @@
struct f2fs_comp_option)
#define F2FS_IOC_DECOMPRESS_FILE _IO(F2FS_IOCTL_MAGIC, 23)
#define F2FS_IOC_COMPRESS_FILE _IO(F2FS_IOCTL_MAGIC, 24)
+#define F2FS_IOC_START_ATOMIC_REPLACE _IO(F2FS_IOCTL_MAGIC, 25)
/*
* should be same as XFS_IOC_GOINGDOWN.
--
2.38.1.273.g43a17bfeac-goog
Powered by blists - more mailing lists