From 41e8f85a75fc60e1543e4903428a1b481b672a17 Mon Sep 17 00:00:00 2001 From: Daeho Jeong Date: Fri, 11 Nov 2022 09:04:06 -0800 Subject: f2fs: introduce F2FS_IOC_START_ATOMIC_REPLACE 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 Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim --- fs/f2fs/file.c | 21 +++++++++++++++------ 1 file changed, 15 insertions(+), 6 deletions(-) (limited to 'fs/f2fs/file.c') diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 28f586e77999..ab0a0d3730f6 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -2034,7 +2034,7 @@ 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); @@ -2103,15 +2103,22 @@ 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); set_inode_flag(fi->cow_inode, FI_COW_FILE); clear_inode_flag(fi->cow_inode, FI_INLINE_DATA); + + 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_up_write(&fi->i_gc_rwsem[WRITE]); f2fs_update_time(sbi, REQ_TIME); @@ -4139,7 +4146,9 @@ 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: -- cgit