From 0fac558b96584799876498248020dc49a98bd131 Mon Sep 17 00:00:00 2001 From: Chao Yu Date: Mon, 9 May 2016 19:56:33 +0800 Subject: [PATCH] f2fs: make atomic/volatile operation exclusive atomic/volatile ioctl interfaces are exposed to user like other file operation interface, it needs to make them getting exclusion against to each other to avoid potential conflict among these operations in concurrent scenario. Signed-off-by: Chao Yu Signed-off-by: Jaegeuk Kim --- fs/f2fs/file.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 2f8f225ddbc5..f67ca62c4f2a 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -1363,6 +1363,8 @@ static int f2fs_ioc_start_atomic_write(struct file *filp) if (ret) return ret; + inode_lock(inode); + if (f2fs_is_atomic_file(inode)) goto out; @@ -1383,6 +1385,7 @@ static int f2fs_ioc_start_atomic_write(struct file *filp) if (ret) clear_inode_flag(F2FS_I(inode), FI_ATOMIC_FILE); out: + inode_unlock(inode); mnt_drop_write_file(filp); return ret; } @@ -1399,6 +1402,8 @@ static int f2fs_ioc_commit_atomic_write(struct file *filp) if (ret) return ret; + inode_lock(inode); + if (f2fs_is_volatile_file(inode)) goto err_out; @@ -1413,6 +1418,7 @@ static int f2fs_ioc_commit_atomic_write(struct file *filp) ret = f2fs_do_sync_file(filp, 0, LLONG_MAX, 0, true); err_out: + inode_unlock(inode); mnt_drop_write_file(filp); return ret; } @@ -1429,6 +1435,8 @@ static int f2fs_ioc_start_volatile_write(struct file *filp) if (ret) return ret; + inode_lock(inode); + if (f2fs_is_volatile_file(inode)) goto out; @@ -1439,6 +1447,7 @@ static int f2fs_ioc_start_volatile_write(struct file *filp) set_inode_flag(F2FS_I(inode), FI_VOLATILE_FILE); f2fs_update_time(F2FS_I_SB(inode), REQ_TIME); out: + inode_unlock(inode); mnt_drop_write_file(filp); return ret; } @@ -1455,6 +1464,8 @@ static int f2fs_ioc_release_volatile_write(struct file *filp) if (ret) return ret; + inode_lock(inode); + if (!f2fs_is_volatile_file(inode)) goto out; @@ -1465,6 +1476,7 @@ static int f2fs_ioc_release_volatile_write(struct file *filp) ret = punch_hole(inode, 0, F2FS_BLKSIZE); out: + inode_unlock(inode); mnt_drop_write_file(filp); return ret; } @@ -1481,6 +1493,8 @@ static int f2fs_ioc_abort_volatile_write(struct file *filp) if (ret) return ret; + inode_lock(inode); + if (f2fs_is_atomic_file(inode)) drop_inmem_pages(inode); if (f2fs_is_volatile_file(inode)) { @@ -1488,6 +1502,8 @@ static int f2fs_ioc_abort_volatile_write(struct file *filp) ret = f2fs_do_sync_file(filp, 0, LLONG_MAX, 0, true); } + inode_unlock(inode); + mnt_drop_write_file(filp); f2fs_update_time(F2FS_I_SB(inode), REQ_TIME); return ret;