From 70f3bad8c3154ba5f241c03f9c0cd050887a119c Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Mon, 12 Apr 2021 18:43:11 +0200 Subject: [PATCH] ext2: Convert to using invalidate_lock Ext2 has its private dax_sem used for synchronizing page faults and truncation. Use mapping->invalidate_lock instead as it is meant for this purpose. CC: Reviewed-by: Christoph Hellwig Signed-off-by: Jan Kara --- fs/ext2/ext2.h | 11 ----------- fs/ext2/file.c | 7 +++---- fs/ext2/inode.c | 12 ++++++------ fs/ext2/super.c | 3 --- 4 files changed, 9 insertions(+), 24 deletions(-) diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h index b0a694820cb7..81907a041570 100644 --- a/fs/ext2/ext2.h +++ b/fs/ext2/ext2.h @@ -667,9 +667,6 @@ struct ext2_inode_info { struct rw_semaphore xattr_sem; #endif rwlock_t i_meta_lock; -#ifdef CONFIG_FS_DAX - struct rw_semaphore dax_sem; -#endif /* * truncate_mutex is for serialising ext2_truncate() against @@ -685,14 +682,6 @@ struct ext2_inode_info { #endif }; -#ifdef CONFIG_FS_DAX -#define dax_sem_down_write(ext2_inode) down_write(&(ext2_inode)->dax_sem) -#define dax_sem_up_write(ext2_inode) up_write(&(ext2_inode)->dax_sem) -#else -#define dax_sem_down_write(ext2_inode) -#define dax_sem_up_write(ext2_inode) -#endif - /* * Inode dynamic state flags */ diff --git a/fs/ext2/file.c b/fs/ext2/file.c index f98466acc672..eb97aa3d700e 100644 --- a/fs/ext2/file.c +++ b/fs/ext2/file.c @@ -81,7 +81,7 @@ out_unlock: * * mmap_lock (MM) * sb_start_pagefault (vfs, freeze) - * ext2_inode_info->dax_sem + * address_space->invalidate_lock * address_space->i_mmap_rwsem or page_lock (mutually exclusive in DAX) * ext2_inode_info->truncate_mutex * @@ -91,7 +91,6 @@ out_unlock: static vm_fault_t ext2_dax_fault(struct vm_fault *vmf) { struct inode *inode = file_inode(vmf->vma->vm_file); - struct ext2_inode_info *ei = EXT2_I(inode); vm_fault_t ret; bool write = (vmf->flags & FAULT_FLAG_WRITE) && (vmf->vma->vm_flags & VM_SHARED); @@ -100,11 +99,11 @@ static vm_fault_t ext2_dax_fault(struct vm_fault *vmf) sb_start_pagefault(inode->i_sb); file_update_time(vmf->vma->vm_file); } - down_read(&ei->dax_sem); + filemap_invalidate_lock_shared(inode->i_mapping); ret = dax_iomap_fault(vmf, PE_SIZE_PTE, NULL, NULL, &ext2_iomap_ops); - up_read(&ei->dax_sem); + filemap_invalidate_unlock_shared(inode->i_mapping); if (write) sb_end_pagefault(inode->i_sb); return ret; diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c index dadb121beb22..33f874f0fc4a 100644 --- a/fs/ext2/inode.c +++ b/fs/ext2/inode.c @@ -1177,7 +1177,7 @@ static void ext2_free_branches(struct inode *inode, __le32 *p, __le32 *q, int de ext2_free_data(inode, p, q); } -/* dax_sem must be held when calling this function */ +/* mapping->invalidate_lock must be held when calling this function */ static void __ext2_truncate_blocks(struct inode *inode, loff_t offset) { __le32 *i_data = EXT2_I(inode)->i_data; @@ -1194,7 +1194,7 @@ static void __ext2_truncate_blocks(struct inode *inode, loff_t offset) iblock = (offset + blocksize-1) >> EXT2_BLOCK_SIZE_BITS(inode->i_sb); #ifdef CONFIG_FS_DAX - WARN_ON(!rwsem_is_locked(&ei->dax_sem)); + WARN_ON(!rwsem_is_locked(&inode->i_mapping->invalidate_lock)); #endif n = ext2_block_to_path(inode, iblock, offsets, NULL); @@ -1276,9 +1276,9 @@ static void ext2_truncate_blocks(struct inode *inode, loff_t offset) if (ext2_inode_is_fast_symlink(inode)) return; - dax_sem_down_write(EXT2_I(inode)); + filemap_invalidate_lock(inode->i_mapping); __ext2_truncate_blocks(inode, offset); - dax_sem_up_write(EXT2_I(inode)); + filemap_invalidate_unlock(inode->i_mapping); } static int ext2_setsize(struct inode *inode, loff_t newsize) @@ -1308,10 +1308,10 @@ static int ext2_setsize(struct inode *inode, loff_t newsize) if (error) return error; - dax_sem_down_write(EXT2_I(inode)); + filemap_invalidate_lock(inode->i_mapping); truncate_setsize(inode, newsize); __ext2_truncate_blocks(inode, newsize); - dax_sem_up_write(EXT2_I(inode)); + filemap_invalidate_unlock(inode->i_mapping); inode->i_mtime = inode->i_ctime = current_time(inode); if (inode_needs_sync(inode)) { diff --git a/fs/ext2/super.c b/fs/ext2/super.c index 21e09fbaa46f..987bcf32ed46 100644 --- a/fs/ext2/super.c +++ b/fs/ext2/super.c @@ -206,9 +206,6 @@ static void init_once(void *foo) init_rwsem(&ei->xattr_sem); #endif mutex_init(&ei->truncate_mutex); -#ifdef CONFIG_FS_DAX - init_rwsem(&ei->dax_sem); -#endif inode_init_once(&ei->vfs_inode); }