From e030a28810daf48b43ef6e92fa502ae410b12c8c Mon Sep 17 00:00:00 2001 From: Dio Putra Date: Sun, 14 Jun 2020 11:45:44 +0700 Subject: ext4: fix coding style in file.c Fixed a few coding style issues in file.c Signed-off-by: Dio Putra Link: https://lore.kernel.org/r/239fcd8f-d33f-8621-9e82-0416dd3f9c94@gmail.com Signed-off-by: Theodore Ts'o --- fs/ext4/file.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) (limited to 'fs/ext4/file.c') diff --git a/fs/ext4/file.c b/fs/ext4/file.c index 2a01e31a032c..453cafecf5cc 100644 --- a/fs/ext4/file.c +++ b/fs/ext4/file.c @@ -145,8 +145,7 @@ static int ext4_release_file(struct inode *inode, struct file *filp) /* if we are the last writer on the inode, drop the block reservation */ if ((filp->f_mode & FMODE_WRITE) && (atomic_read(&inode->i_writecount) == 1) && - !EXT4_I(inode)->i_reserved_data_blocks) - { + !EXT4_I(inode)->i_reserved_data_blocks) { down_write(&EXT4_I(inode)->i_data_sem); ext4_discard_preallocations(inode); up_write(&EXT4_I(inode)->i_data_sem); @@ -810,7 +809,7 @@ out: return err; } -static int ext4_file_open(struct inode * inode, struct file * filp) +static int ext4_file_open(struct inode *inode, struct file *filp) { int ret; -- cgit v1.2.1 From 0b3171b6d195637f84ddf8b59bae818ea20bc8ac Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Wed, 8 Jul 2020 17:35:16 +0200 Subject: ext4: do not block RWF_NOWAIT dio write on unallocated space Since commit 378f32bab371 ("ext4: introduce direct I/O write using iomap infrastructure") we don't properly bail out of RWF_NOWAIT direct IO write if underlying blocks are not allocated. Also ext4_dio_write_checks() does not honor RWF_NOWAIT when re-acquiring i_rwsem. Fix both issues. Fixes: 378f32bab371 ("ext4: introduce direct I/O write using iomap infrastructure") Cc: stable@kernel.org Reported-by: Filipe Manana Signed-off-by: Jan Kara Reviewed-by: Ritesh Harjani Link: https://lore.kernel.org/r/20200708153516.9507-1-jack@suse.cz Signed-off-by: Theodore Ts'o --- fs/ext4/file.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'fs/ext4/file.c') diff --git a/fs/ext4/file.c b/fs/ext4/file.c index 453cafecf5cc..7a2720517bbb 100644 --- a/fs/ext4/file.c +++ b/fs/ext4/file.c @@ -427,6 +427,10 @@ restart: */ if (*ilock_shared && (!IS_NOSEC(inode) || *extend || !ext4_overwrite_io(inode, offset, count))) { + if (iocb->ki_flags & IOCB_NOWAIT) { + ret = -EAGAIN; + goto out; + } inode_unlock_shared(inode); *ilock_shared = false; inode_lock(inode); -- cgit v1.2.1 From 27bc446e2def38db3244a6eb4bb1d6312936610a Mon Sep 17 00:00:00 2001 From: brookxu Date: Mon, 17 Aug 2020 15:36:15 +0800 Subject: ext4: limit the length of per-inode prealloc list MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit In the scenario of writing sparse files, the per-inode prealloc list may be very long, resulting in high overhead for ext4_mb_use_preallocated(). To circumvent this problem, we limit the maximum length of per-inode prealloc list to 512 and allow users to modify it. After patching, we observed that the sys ratio of cpu has dropped, and the system throughput has increased significantly. We created a process to write the sparse file, and the running time of the process on the fixed kernel was significantly reduced, as follows: Running time on unfixed kernel： [root@TENCENT64 ~]# time taskset 0x01 ./sparse /data1/sparce.dat real 0m2.051s user 0m0.008s sys 0m2.026s Running time on fixed kernel： [root@TENCENT64 ~]# time taskset 0x01 ./sparse /data1/sparce.dat real 0m0.471s user 0m0.004s sys 0m0.395s Signed-off-by: Chunguang Xu Link: https://lore.kernel.org/r/d7a98178-056b-6db5-6bce-4ead23f4a257@gmail.com Signed-off-by: Theodore Ts'o --- fs/ext4/file.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'fs/ext4/file.c') diff --git a/fs/ext4/file.c b/fs/ext4/file.c index 7a2720517bbb..e608ce3fb535 100644 --- a/fs/ext4/file.c +++ b/fs/ext4/file.c @@ -147,7 +147,7 @@ static int ext4_release_file(struct inode *inode, struct file *filp) (atomic_read(&inode->i_writecount) == 1) && !EXT4_I(inode)->i_reserved_data_blocks) { down_write(&EXT4_I(inode)->i_data_sem); - ext4_discard_preallocations(inode); + ext4_discard_preallocations(inode, 0); up_write(&EXT4_I(inode)->i_data_sem); } if (is_dx(inode) && filp->private_data) -- cgit v1.2.1