From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ritesh Harjani Subject: [RESEND PATCH 1/1] fs: Use inode_lock/unlock class of provided APIs in filesystems Date: Wed, 1 Jan 2020 16:22:48 +0530 Message-ID: <20200101105248.25304-2-riteshh@linux.ibm.com> References: <20200101105248.25304-1-riteshh@linux.ibm.com> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Return-path: In-Reply-To: <20200101105248.25304-1-riteshh@linux.ibm.com> Sender: linux-btrfs-owner@vger.kernel.org To: linux-fsdevel@vger.kernel.org, viro@zeniv.linux.org.uk Cc: willy@infradead.org, jlayton@kernel.org, ceph-devel@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-nfs@vger.kernel.org, devel@lists.orangefs.org, linux-unionfs@vger.kernel.org, dsterba@suse.cz, Ritesh Harjani , David Sterba List-Id: linux-unionfs@vger.kernel.org This defines 4 more APIs which some of the filesystem needs and reduces the direct use of i_rwsem in filesystem drivers. Instead those are replaced with inode_lock/unlock_** APIs. Signed-off-by: Ritesh Harjani Reviewed-by: Matthew Wilcox (Oracle) Reviewed-by: Jeff Layton Acked-by: David Sterba --- fs/btrfs/delayed-inode.c | 2 +- fs/btrfs/ioctl.c | 4 ++-- fs/ceph/io.c | 24 ++++++++++++------------ fs/nfs/io.c | 24 ++++++++++++------------ fs/orangefs/file.c | 4 ++-- fs/overlayfs/readdir.c | 2 +- fs/readdir.c | 4 ++-- include/linux/fs.h | 21 +++++++++++++++++++++ 8 files changed, 53 insertions(+), 32 deletions(-) diff --git a/fs/btrfs/delayed-inode.c b/fs/btrfs/delayed-inode.c index d3e15e1d4a91..c3e92f2fd915 100644 --- a/fs/btrfs/delayed-inode.c +++ b/fs/btrfs/delayed-inode.c @@ -1644,7 +1644,7 @@ void btrfs_readdir_put_delayed_items(struct inode *inode, * The VFS is going to do up_read(), so we need to downgrade back to a * read lock. */ - downgrade_write(&inode->i_rwsem); + inode_lock_downgrade(inode); } int btrfs_should_delete_dir_index(struct list_head *del_list, diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 18e328ce4b54..caa80372992d 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -961,7 +961,7 @@ static noinline int btrfs_mksubvol(const struct path *parent, struct dentry *dentry; int error; - error = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); + error = inode_lock_killable_nested(dir, I_MUTEX_PARENT); if (error == -EINTR) return error; @@ -2869,7 +2869,7 @@ static noinline int btrfs_ioctl_snap_destroy(struct file *file, goto out; - err = down_write_killable_nested(&dir->i_rwsem, I_MUTEX_PARENT); + err = inode_lock_killable_nested(dir, I_MUTEX_PARENT); if (err == -EINTR) goto out_drop_write; dentry = lookup_one_len(vol_args->name, parent, namelen); diff --git a/fs/ceph/io.c b/fs/ceph/io.c index 97602ea92ff4..e94186259c2e 100644 --- a/fs/ceph/io.c +++ b/fs/ceph/io.c @@ -53,14 +53,14 @@ ceph_start_io_read(struct inode *inode) struct ceph_inode_info *ci = ceph_inode(inode); /* Be an optimist! */ - down_read(&inode->i_rwsem); + inode_lock_shared(inode); if (!(READ_ONCE(ci->i_ceph_flags) & CEPH_I_ODIRECT)) return; - up_read(&inode->i_rwsem); + inode_unlock_shared(inode); /* Slow path.... */ - down_write(&inode->i_rwsem); + inode_lock(inode); ceph_block_o_direct(ci, inode); - downgrade_write(&inode->i_rwsem); + inode_lock_downgrade(inode); } /** @@ -73,7 +73,7 @@ ceph_start_io_read(struct inode *inode) void ceph_end_io_read(struct inode *inode) { - up_read(&inode->i_rwsem); + inode_unlock_shared(inode); } /** @@ -86,7 +86,7 @@ ceph_end_io_read(struct inode *inode) void ceph_start_io_write(struct inode *inode) { - down_write(&inode->i_rwsem); + inode_lock(inode); ceph_block_o_direct(ceph_inode(inode), inode); } @@ -100,7 +100,7 @@ ceph_start_io_write(struct inode *inode) void ceph_end_io_write(struct inode *inode) { - up_write(&inode->i_rwsem); + inode_unlock(inode); } /* Call with exclusively locked inode->i_rwsem */ @@ -139,14 +139,14 @@ ceph_start_io_direct(struct inode *inode) struct ceph_inode_info *ci = ceph_inode(inode); /* Be an optimist! */ - down_read(&inode->i_rwsem); + inode_lock_shared(inode); if (READ_ONCE(ci->i_ceph_flags) & CEPH_I_ODIRECT) return; - up_read(&inode->i_rwsem); + inode_unlock_shared(inode); /* Slow path.... */ - down_write(&inode->i_rwsem); + inode_lock(inode); ceph_block_buffered(ci, inode); - downgrade_write(&inode->i_rwsem); + inode_lock_downgrade(inode); } /** @@ -159,5 +159,5 @@ ceph_start_io_direct(struct inode *inode) void ceph_end_io_direct(struct inode *inode) { - up_read(&inode->i_rwsem); + inode_unlock_shared(inode); } diff --git a/fs/nfs/io.c b/fs/nfs/io.c index 5088fda9b453..bf5ed7bea59d 100644 --- a/fs/nfs/io.c +++ b/fs/nfs/io.c @@ -44,14 +44,14 @@ nfs_start_io_read(struct inode *inode) { struct nfs_inode *nfsi = NFS_I(inode); /* Be an optimist! */ - down_read(&inode->i_rwsem); + inode_lock_shared(inode); if (test_bit(NFS_INO_ODIRECT, &nfsi->flags) == 0) return; - up_read(&inode->i_rwsem); + inode_unlock_shared(inode); /* Slow path.... */ - down_write(&inode->i_rwsem); + inode_lock(inode); nfs_block_o_direct(nfsi, inode); - downgrade_write(&inode->i_rwsem); + inode_lock_downgrade(inode); } /** @@ -64,7 +64,7 @@ nfs_start_io_read(struct inode *inode) void nfs_end_io_read(struct inode *inode) { - up_read(&inode->i_rwsem); + inode_unlock_shared(inode); } /** @@ -77,7 +77,7 @@ nfs_end_io_read(struct inode *inode) void nfs_start_io_write(struct inode *inode) { - down_write(&inode->i_rwsem); + inode_lock(inode); nfs_block_o_direct(NFS_I(inode), inode); } @@ -91,7 +91,7 @@ nfs_start_io_write(struct inode *inode) void nfs_end_io_write(struct inode *inode) { - up_write(&inode->i_rwsem); + inode_unlock(inode); } /* Call with exclusively locked inode->i_rwsem */ @@ -124,14 +124,14 @@ nfs_start_io_direct(struct inode *inode) { struct nfs_inode *nfsi = NFS_I(inode); /* Be an optimist! */ - down_read(&inode->i_rwsem); + inode_lock_shared(inode); if (test_bit(NFS_INO_ODIRECT, &nfsi->flags) != 0) return; - up_read(&inode->i_rwsem); + inode_unlock_shared(inode); /* Slow path.... */ - down_write(&inode->i_rwsem); + inode_lock(inode); nfs_block_buffered(nfsi, inode); - downgrade_write(&inode->i_rwsem); + inode_lock_downgrade(inode); } /** @@ -144,5 +144,5 @@ nfs_start_io_direct(struct inode *inode) void nfs_end_io_direct(struct inode *inode) { - up_read(&inode->i_rwsem); + inode_unlock_shared(inode); } diff --git a/fs/orangefs/file.c b/fs/orangefs/file.c index c740159d9ad1..369ace12249d 100644 --- a/fs/orangefs/file.c +++ b/fs/orangefs/file.c @@ -363,14 +363,14 @@ static ssize_t orangefs_file_read_iter(struct kiocb *iocb, ro->blksiz = iter->count; } - down_read(&file_inode(iocb->ki_filp)->i_rwsem); + inode_lock_shared(file_inode(iocb->ki_filp)); ret = orangefs_revalidate_mapping(file_inode(iocb->ki_filp)); if (ret) goto out; ret = generic_file_read_iter(iocb, iter); out: - up_read(&file_inode(iocb->ki_filp)->i_rwsem); + inode_unlock_shared(file_inode(iocb->ki_filp)); return ret; } diff --git a/fs/overlayfs/readdir.c b/fs/overlayfs/readdir.c index 47a91c9733a5..c203e73160b0 100644 --- a/fs/overlayfs/readdir.c +++ b/fs/overlayfs/readdir.c @@ -273,7 +273,7 @@ static int ovl_check_whiteouts(struct dentry *dir, struct ovl_readdir_data *rdd) old_cred = ovl_override_creds(rdd->dentry->d_sb); - err = down_write_killable(&dir->d_inode->i_rwsem); + err = inode_lock_killable(dir->d_inode); if (!err) { while (rdd->first_maybe_whiteout) { p = rdd->first_maybe_whiteout; diff --git a/fs/readdir.c b/fs/readdir.c index d26d5ea4de7b..10a34efa0af0 100644 --- a/fs/readdir.c +++ b/fs/readdir.c @@ -52,9 +52,9 @@ int iterate_dir(struct file *file, struct dir_context *ctx) goto out; if (shared) - res = down_read_killable(&inode->i_rwsem); + res = inode_lock_shared_killable(inode); else - res = down_write_killable(&inode->i_rwsem); + res = inode_lock_killable(inode); if (res) goto out; diff --git a/include/linux/fs.h b/include/linux/fs.h index 98e0349adb52..2b407464fac1 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -831,6 +831,27 @@ static inline void inode_lock_shared_nested(struct inode *inode, unsigned subcla down_read_nested(&inode->i_rwsem, subclass); } +static inline void inode_lock_downgrade(struct inode *inode) +{ + downgrade_write(&inode->i_rwsem); +} + +static inline int inode_lock_killable(struct inode *inode) +{ + return down_write_killable(&inode->i_rwsem); +} + +static inline int inode_lock_shared_killable(struct inode *inode) +{ + return down_read_killable(&inode->i_rwsem); +} + +static inline int inode_lock_killable_nested(struct inode *inode, + unsigned subclass) +{ + return down_write_killable_nested(&inode->i_rwsem, subclass); +} + void lock_two_nondirectories(struct inode *, struct inode*); void unlock_two_nondirectories(struct inode *, struct inode*); -- 2.21.0