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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: <linux-ext4@vger.kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2021-04-12 18:43:11 +02:00
parent d4f5258eae
commit 70f3bad8c3
4 changed files with 9 additions and 24 deletions
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11
fs/ext2/ext2.h
View File

@ -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
*/

7
fs/ext2/file.c
View File

@ -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;

12
fs/ext2/inode.c
View File

@ -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)) {

3
fs/ext2/super.c
View File

@ -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);
}