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[209.132.180.67]) by mx.google.com with ESMTP id bu11si15342456edb.245.2019.11.20.05.38.33; Wed, 20 Nov 2019 05:39:00 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-ext4-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-ext4-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-ext4-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728057AbfKTNLL (ORCPT + 99 others); Wed, 20 Nov 2019 08:11:11 -0500 Received: from mx2.suse.de ([195.135.220.15]:50266 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727958AbfKTNLL (ORCPT ); Wed, 20 Nov 2019 08:11:11 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id B8DC0B26F; Wed, 20 Nov 2019 13:11:07 +0000 (UTC) Received: by quack2.suse.cz (Postfix, from userid 1000) id 37EC81E484C; Wed, 20 Nov 2019 14:11:07 +0100 (CET) Date: Wed, 20 Nov 2019 14:11:07 +0100 From: Jan Kara To: Ritesh Harjani Cc: jack@suse.cz, tytso@mit.edu, linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, mbobrowski@mbobrowski.org Subject: Re: [RFCv3 2/4] ext4: Add ext4_ilock & ext4_iunlock API Message-ID: <20191120131107.GC9509@quack2.suse.cz> References: <20191120050024.11161-1-riteshh@linux.ibm.com> <20191120050024.11161-3-riteshh@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191120050024.11161-3-riteshh@linux.ibm.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-ext4-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-ext4@vger.kernel.org On Wed 20-11-19 10:30:22, Ritesh Harjani wrote: > This adds ext4_ilock/iunlock types of APIs. > This is the preparation APIs to make shared > locking/unlocking & restarting with exclusive > locking/unlocking easier in next patch. > > Signed-off-by: Ritesh Harjani I know XFS does it this way but I don't think we need the obsurity of additional locking helpers etc. just because of one place in ext4_dio_write_iter() that will use this. So I'd just drop this patch... Honza > --- > fs/ext4/ext4.h | 33 ++++++++++++++++++++++++++++++ > fs/ext4/extents.c | 16 +++++++-------- > fs/ext4/file.c | 52 +++++++++++++++++++++++------------------------ > fs/ext4/inode.c | 4 ++-- > fs/ext4/ioctl.c | 16 +++++++-------- > fs/ext4/super.c | 12 +++++------ > fs/ext4/xattr.c | 17 ++++++++-------- > 7 files changed, 92 insertions(+), 58 deletions(-) > > diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h > index 61987c106511..b4169a92e8d0 100644 > --- a/fs/ext4/ext4.h > +++ b/fs/ext4/ext4.h > @@ -2960,6 +2960,39 @@ do { \ > #define EXT4_FREECLUSTERS_WATERMARK 0 > #endif > > +#define EXT4_IOLOCK_EXCL (1 << 0) > +#define EXT4_IOLOCK_SHARED (1 << 1) > + > +static inline void ext4_ilock(struct inode *inode, unsigned int iolock) > +{ > + if (iolock == EXT4_IOLOCK_EXCL) > + inode_lock(inode); > + else > + inode_lock_shared(inode); > +} > + > +static inline void ext4_iunlock(struct inode *inode, unsigned int iolock) > +{ > + if (iolock == EXT4_IOLOCK_EXCL) > + inode_unlock(inode); > + else > + inode_unlock_shared(inode); > +} > + > +static inline int ext4_ilock_nowait(struct inode *inode, unsigned int iolock) > +{ > + if (iolock == EXT4_IOLOCK_EXCL) > + return inode_trylock(inode); > + else > + return inode_trylock_shared(inode); > +} > + > +static inline void ext4_ilock_demote(struct inode *inode, unsigned int iolock) > +{ > + BUG_ON(iolock != EXT4_IOLOCK_EXCL); > + downgrade_write(&inode->i_rwsem); > +} > + > /* Update i_disksize. Requires i_mutex to avoid races with truncate */ > static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize) > { > diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c > index 0e8708b77da6..08dd57558533 100644 > --- a/fs/ext4/extents.c > +++ b/fs/ext4/extents.c > @@ -4754,7 +4754,7 @@ static long ext4_zero_range(struct file *file, loff_t offset, > else > max_blocks -= lblk; > > - inode_lock(inode); > + ext4_ilock(inode, EXT4_IOLOCK_EXCL); > > /* > * Indirect files do not support unwritten extnets > @@ -4864,7 +4864,7 @@ static long ext4_zero_range(struct file *file, loff_t offset, > > ext4_journal_stop(handle); > out_mutex: > - inode_unlock(inode); > + ext4_iunlock(inode, EXT4_IOLOCK_EXCL); > return ret; > } > > @@ -4930,7 +4930,7 @@ long ext4_fallocate(struct file *file, int mode, loff_t offset, loff_t len) > if (mode & FALLOC_FL_KEEP_SIZE) > flags |= EXT4_GET_BLOCKS_KEEP_SIZE; > > - inode_lock(inode); > + ext4_ilock(inode, EXT4_IOLOCK_EXCL); > > /* > * We only support preallocation for extent-based files only > @@ -4961,7 +4961,7 @@ long ext4_fallocate(struct file *file, int mode, loff_t offset, loff_t len) > EXT4_I(inode)->i_sync_tid); > } > out: > - inode_unlock(inode); > + ext4_iunlock(inode, EXT4_IOLOCK_EXCL); > trace_ext4_fallocate_exit(inode, offset, max_blocks, ret); > return ret; > } > @@ -5509,7 +5509,7 @@ int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len) > return ret; > } > > - inode_lock(inode); > + ext4_ilock(inode, EXT4_IOLOCK_EXCL); > /* > * There is no need to overlap collapse range with EOF, in which case > * it is effectively a truncate operation > @@ -5608,7 +5608,7 @@ int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len) > out_mmap: > up_write(&EXT4_I(inode)->i_mmap_sem); > out_mutex: > - inode_unlock(inode); > + ext4_iunlock(inode, EXT4_IOLOCK_EXCL); > return ret; > } > > @@ -5659,7 +5659,7 @@ int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len) > return ret; > } > > - inode_lock(inode); > + ext4_ilock(inode, EXT4_IOLOCK_EXCL); > /* Currently just for extent based files */ > if (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) { > ret = -EOPNOTSUPP; > @@ -5786,7 +5786,7 @@ int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len) > out_mmap: > up_write(&EXT4_I(inode)->i_mmap_sem); > out_mutex: > - inode_unlock(inode); > + ext4_iunlock(inode, EXT4_IOLOCK_EXCL); > return ret; > } > > diff --git a/fs/ext4/file.c b/fs/ext4/file.c > index 977ac58dc718..ebe3f051598d 100644 > --- a/fs/ext4/file.c > +++ b/fs/ext4/file.c > @@ -55,14 +55,14 @@ static ssize_t ext4_dio_read_iter(struct kiocb *iocb, struct iov_iter *to) > struct inode *inode = file_inode(iocb->ki_filp); > > if (iocb->ki_flags & IOCB_NOWAIT) { > - if (!inode_trylock_shared(inode)) > + if (!ext4_ilock_nowait(inode, EXT4_IOLOCK_SHARED)) > return -EAGAIN; > } else { > - inode_lock_shared(inode); > + ext4_ilock(inode, EXT4_IOLOCK_SHARED); > } > > if (!ext4_dio_supported(inode)) { > - inode_unlock_shared(inode); > + ext4_iunlock(inode, EXT4_IOLOCK_SHARED); > /* > * Fallback to buffered I/O if the operation being performed on > * the inode is not supported by direct I/O. The IOCB_DIRECT > @@ -76,7 +76,7 @@ static ssize_t ext4_dio_read_iter(struct kiocb *iocb, struct iov_iter *to) > > ret = iomap_dio_rw(iocb, to, &ext4_iomap_ops, NULL, > is_sync_kiocb(iocb)); > - inode_unlock_shared(inode); > + ext4_iunlock(inode, EXT4_IOLOCK_SHARED); > > file_accessed(iocb->ki_filp); > return ret; > @@ -89,22 +89,23 @@ static ssize_t ext4_dax_read_iter(struct kiocb *iocb, struct iov_iter *to) > ssize_t ret; > > if (iocb->ki_flags & IOCB_NOWAIT) { > - if (!inode_trylock_shared(inode)) > + if (!ext4_ilock_nowait(inode, EXT4_IOLOCK_SHARED)) > return -EAGAIN; > } else { > - inode_lock_shared(inode); > + ext4_ilock(inode, EXT4_IOLOCK_SHARED); > } > + > /* > * Recheck under inode lock - at this point we are sure it cannot > * change anymore > */ > if (!IS_DAX(inode)) { > - inode_unlock_shared(inode); > + ext4_iunlock(inode, EXT4_IOLOCK_SHARED); > /* Fallback to buffered IO in case we cannot support DAX */ > return generic_file_read_iter(iocb, to); > } > ret = dax_iomap_rw(iocb, to, &ext4_iomap_ops); > - inode_unlock_shared(inode); > + ext4_iunlock(inode, EXT4_IOLOCK_SHARED); > > file_accessed(iocb->ki_filp); > return ret; > @@ -244,7 +245,7 @@ static ssize_t ext4_buffered_write_iter(struct kiocb *iocb, > if (iocb->ki_flags & IOCB_NOWAIT) > return -EOPNOTSUPP; > > - inode_lock(inode); > + ext4_ilock(inode, EXT4_IOLOCK_EXCL); > ret = ext4_write_checks(iocb, from); > if (ret <= 0) > goto out; > @@ -254,7 +255,7 @@ static ssize_t ext4_buffered_write_iter(struct kiocb *iocb, > current->backing_dev_info = NULL; > > out: > - inode_unlock(inode); > + ext4_iunlock(inode, EXT4_IOLOCK_EXCL); > if (likely(ret > 0)) { > iocb->ki_pos += ret; > ret = generic_write_sync(iocb, ret); > @@ -372,16 +373,17 @@ static ssize_t ext4_dio_write_iter(struct kiocb *iocb, struct iov_iter *from) > handle_t *handle; > struct inode *inode = file_inode(iocb->ki_filp); > bool extend = false, overwrite = false, unaligned_aio = false; > + unsigned int iolock = EXT4_IOLOCK_EXCL; > > if (iocb->ki_flags & IOCB_NOWAIT) { > - if (!inode_trylock(inode)) > + if (!ext4_ilock_nowait(inode, iolock)) > return -EAGAIN; > } else { > - inode_lock(inode); > + ext4_ilock(inode, iolock); > } > > if (!ext4_dio_supported(inode)) { > - inode_unlock(inode); > + ext4_iunlock(inode, iolock); > /* > * Fallback to buffered I/O if the inode does not support > * direct I/O. > @@ -391,7 +393,7 @@ static ssize_t ext4_dio_write_iter(struct kiocb *iocb, struct iov_iter *from) > > ret = ext4_write_checks(iocb, from); > if (ret <= 0) { > - inode_unlock(inode); > + ext4_iunlock(inode, iolock); > return ret; > } > > @@ -416,7 +418,8 @@ static ssize_t ext4_dio_write_iter(struct kiocb *iocb, struct iov_iter *from) > if (!unaligned_aio && ext4_overwrite_io(inode, offset, count) && > ext4_should_dioread_nolock(inode)) { > overwrite = true; > - downgrade_write(&inode->i_rwsem); > + ext4_ilock_demote(inode, iolock); > + iolock = EXT4_IOLOCK_SHARED; > } > > if (offset + count > EXT4_I(inode)->i_disksize) { > @@ -443,10 +446,7 @@ static ssize_t ext4_dio_write_iter(struct kiocb *iocb, struct iov_iter *from) > ret = ext4_handle_inode_extension(inode, offset, ret, count); > > out: > - if (overwrite) > - inode_unlock_shared(inode); > - else > - inode_unlock(inode); > + ext4_iunlock(inode, iolock); > > if (ret >= 0 && iov_iter_count(from)) { > ssize_t err; > @@ -489,10 +489,10 @@ ext4_dax_write_iter(struct kiocb *iocb, struct iov_iter *from) > struct inode *inode = file_inode(iocb->ki_filp); > > if (iocb->ki_flags & IOCB_NOWAIT) { > - if (!inode_trylock(inode)) > + if (!ext4_ilock_nowait(inode, EXT4_IOLOCK_EXCL)) > return -EAGAIN; > } else { > - inode_lock(inode); > + ext4_ilock(inode, EXT4_IOLOCK_EXCL); > } > > ret = ext4_write_checks(iocb, from); > @@ -524,7 +524,7 @@ ext4_dax_write_iter(struct kiocb *iocb, struct iov_iter *from) > if (extend) > ret = ext4_handle_inode_extension(inode, offset, ret, count); > out: > - inode_unlock(inode); > + ext4_iunlock(inode, EXT4_IOLOCK_EXCL); > if (ret > 0) > ret = generic_write_sync(iocb, ret); > return ret; > @@ -757,16 +757,16 @@ loff_t ext4_llseek(struct file *file, loff_t offset, int whence) > return generic_file_llseek_size(file, offset, whence, > maxbytes, i_size_read(inode)); > case SEEK_HOLE: > - inode_lock_shared(inode); > + ext4_ilock(inode, EXT4_IOLOCK_SHARED); > offset = iomap_seek_hole(inode, offset, > &ext4_iomap_report_ops); > - inode_unlock_shared(inode); > + ext4_iunlock(inode, EXT4_IOLOCK_SHARED); > break; > case SEEK_DATA: > - inode_lock_shared(inode); > + ext4_ilock(inode, EXT4_IOLOCK_SHARED); > offset = iomap_seek_data(inode, offset, > &ext4_iomap_report_ops); > - inode_unlock_shared(inode); > + ext4_iunlock(inode, EXT4_IOLOCK_SHARED); > break; > } > > diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c > index 381813205f99..39dcc22667a1 100644 > --- a/fs/ext4/inode.c > +++ b/fs/ext4/inode.c > @@ -3930,7 +3930,7 @@ int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length) > return ret; > } > > - inode_lock(inode); > + ext4_ilock(inode, EXT4_IOLOCK_EXCL); > > /* No need to punch hole beyond i_size */ > if (offset >= inode->i_size) > @@ -4037,7 +4037,7 @@ int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length) > out_dio: > up_write(&EXT4_I(inode)->i_mmap_sem); > out_mutex: > - inode_unlock(inode); > + ext4_iunlock(inode, EXT4_IOLOCK_EXCL); > return ret; > } > > diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c > index 0b7f316fd30f..43b7a23dc57b 100644 > --- a/fs/ext4/ioctl.c > +++ b/fs/ext4/ioctl.c > @@ -855,13 +855,13 @@ long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) > if (err) > return err; > > - inode_lock(inode); > + ext4_ilock(inode, EXT4_IOLOCK_EXCL); > err = ext4_ioctl_check_immutable(inode, > from_kprojid(&init_user_ns, ei->i_projid), > flags); > if (!err) > err = ext4_ioctl_setflags(inode, flags); > - inode_unlock(inode); > + ext4_iunlock(inode, EXT4_IOLOCK_EXCL); > mnt_drop_write_file(filp); > return err; > } > @@ -892,7 +892,7 @@ long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) > goto setversion_out; > } > > - inode_lock(inode); > + ext4_ilock(inode, EXT4_IOLOCK_EXCL); > handle = ext4_journal_start(inode, EXT4_HT_INODE, 1); > if (IS_ERR(handle)) { > err = PTR_ERR(handle); > @@ -907,7 +907,7 @@ long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) > ext4_journal_stop(handle); > > unlock_out: > - inode_unlock(inode); > + ext4_iunlock(inode, EXT4_IOLOCK_EXCL); > setversion_out: > mnt_drop_write_file(filp); > return err; > @@ -1026,9 +1026,9 @@ long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) > * ext4_ext_swap_inode_data before we switch the > * inode format to prevent read. > */ > - inode_lock((inode)); > + ext4_ilock(inode, EXT4_IOLOCK_EXCL); > err = ext4_ext_migrate(inode); > - inode_unlock((inode)); > + ext4_iunlock(inode, EXT4_IOLOCK_EXCL); > mnt_drop_write_file(filp); > return err; > } > @@ -1272,7 +1272,7 @@ long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) > if (err) > return err; > > - inode_lock(inode); > + ext4_ilock(inode, EXT4_IOLOCK_EXCL); > ext4_fill_fsxattr(inode, &old_fa); > err = vfs_ioc_fssetxattr_check(inode, &old_fa, &fa); > if (err) > @@ -1287,7 +1287,7 @@ long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) > goto out; > err = ext4_ioctl_setproject(filp, fa.fsx_projid); > out: > - inode_unlock(inode); > + ext4_iunlock(inode, EXT4_IOLOCK_EXCL); > mnt_drop_write_file(filp); > return err; > } > diff --git a/fs/ext4/super.c b/fs/ext4/super.c > index 7796e2ffc294..48b83b2cf0ad 100644 > --- a/fs/ext4/super.c > +++ b/fs/ext4/super.c > @@ -2682,12 +2682,12 @@ static void ext4_orphan_cleanup(struct super_block *sb, > __func__, inode->i_ino, inode->i_size); > jbd_debug(2, "truncating inode %lu to %lld bytes\n", > inode->i_ino, inode->i_size); > - inode_lock(inode); > + ext4_ilock(inode, EXT4_IOLOCK_EXCL); > truncate_inode_pages(inode->i_mapping, inode->i_size); > ret = ext4_truncate(inode); > if (ret) > ext4_std_error(inode->i_sb, ret); > - inode_unlock(inode); > + ext4_iunlock(inode, EXT4_IOLOCK_EXCL); > nr_truncates++; > } else { > if (test_opt(sb, DEBUG)) > @@ -5785,7 +5785,7 @@ static int ext4_quota_on(struct super_block *sb, int type, int format_id, > * files. If this fails, we return success anyway since quotas > * are already enabled and this is not a hard failure. > */ > - inode_lock(inode); > + ext4_ilock(inode, EXT4_IOLOCK_EXCL); > handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1); > if (IS_ERR(handle)) > goto unlock_inode; > @@ -5795,7 +5795,7 @@ static int ext4_quota_on(struct super_block *sb, int type, int format_id, > ext4_mark_inode_dirty(handle, inode); > ext4_journal_stop(handle); > unlock_inode: > - inode_unlock(inode); > + ext4_iunlock(inode, EXT4_IOLOCK_EXCL); > } > return err; > } > @@ -5887,7 +5887,7 @@ static int ext4_quota_off(struct super_block *sb, int type) > if (err || ext4_has_feature_quota(sb)) > goto out_put; > > - inode_lock(inode); > + ext4_ilock(inode, EXT4_IOLOCK_EXCL); > /* > * Update modification times of quota files when userspace can > * start looking at them. If we fail, we return success anyway since > @@ -5902,7 +5902,7 @@ static int ext4_quota_off(struct super_block *sb, int type) > ext4_mark_inode_dirty(handle, inode); > ext4_journal_stop(handle); > out_unlock: > - inode_unlock(inode); > + ext4_iunlock(inode, EXT4_IOLOCK_EXCL); > out_put: > lockdep_set_quota_inode(inode, I_DATA_SEM_NORMAL); > iput(inode); > diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c > index 8966a5439a22..5c2dcc4c836a 100644 > --- a/fs/ext4/xattr.c > +++ b/fs/ext4/xattr.c > @@ -422,9 +422,9 @@ static int ext4_xattr_inode_iget(struct inode *parent, unsigned long ea_ino, > ext4_set_inode_state(inode, EXT4_STATE_LUSTRE_EA_INODE); > ext4_xattr_inode_set_ref(inode, 1); > } else { > - inode_lock(inode); > + ext4_ilock(inode, EXT4_IOLOCK_EXCL); > inode->i_flags |= S_NOQUOTA; > - inode_unlock(inode); > + ext4_iunlock(inode, EXT4_IOLOCK_EXCL); > } > > *ea_inode = inode; > @@ -976,7 +976,7 @@ static int ext4_xattr_inode_update_ref(handle_t *handle, struct inode *ea_inode, > u32 hash; > int ret; > > - inode_lock(ea_inode); > + ext4_ilock(ea_inode, EXT4_IOLOCK_EXCL); > > ret = ext4_reserve_inode_write(handle, ea_inode, &iloc); > if (ret) > @@ -1030,7 +1030,7 @@ static int ext4_xattr_inode_update_ref(handle_t *handle, struct inode *ea_inode, > ext4_warning_inode(ea_inode, > "ext4_mark_iloc_dirty() failed ret=%d", ret); > out: > - inode_unlock(ea_inode); > + ext4_iunlock(ea_inode, EXT4_IOLOCK_EXCL); > return ret; > } > > @@ -1380,10 +1380,11 @@ static int ext4_xattr_inode_write(handle_t *handle, struct inode *ea_inode, > block += 1; > } > > - inode_lock(ea_inode); > + ext4_ilock(ea_inode, EXT4_IOLOCK_EXCL); > i_size_write(ea_inode, wsize); > ext4_update_i_disksize(ea_inode, wsize); > - inode_unlock(ea_inode); > + ext4_iunlock(ea_inode, EXT4_IOLOCK_EXCL); > + > > ext4_mark_inode_dirty(handle, ea_inode); > > @@ -1432,9 +1433,9 @@ static struct inode *ext4_xattr_inode_create(handle_t *handle, > */ > dquot_free_inode(ea_inode); > dquot_drop(ea_inode); > - inode_lock(ea_inode); > + ext4_ilock(ea_inode, EXT4_IOLOCK_EXCL); > ea_inode->i_flags |= S_NOQUOTA; > - inode_unlock(ea_inode); > + ext4_iunlock(ea_inode, EXT4_IOLOCK_EXCL); > } > > return ea_inode; > -- > 2.21.0 > -- Jan Kara SUSE Labs, CR