diff options
Diffstat (limited to 'fs/ext4/file.c')
| -rw-r--r-- | fs/ext4/file.c | 65 |
1 files changed, 26 insertions, 39 deletions
diff --git a/fs/ext4/file.c b/fs/ext4/file.c index d663d3d7c81c..cefa9835f275 100644 --- a/fs/ext4/file.c +++ b/fs/ext4/file.c @@ -57,6 +57,9 @@ static ssize_t ext4_dax_read_iter(struct kiocb *iocb, struct iov_iter *to) static ssize_t ext4_file_read_iter(struct kiocb *iocb, struct iov_iter *to) { + if (unlikely(ext4_forced_shutdown(EXT4_SB(file_inode(iocb->ki_filp)->i_sb)))) + return -EIO; + if (!iov_iter_count(to)) return 0; /* skip atime */ @@ -175,7 +178,6 @@ ext4_dax_write_iter(struct kiocb *iocb, struct iov_iter *from) { struct inode *inode = file_inode(iocb->ki_filp); ssize_t ret; - bool overwrite = false; inode_lock(inode); ret = ext4_write_checks(iocb, from); @@ -188,16 +190,9 @@ ext4_dax_write_iter(struct kiocb *iocb, struct iov_iter *from) if (ret) goto out; - if (ext4_overwrite_io(inode, iocb->ki_pos, iov_iter_count(from))) { - overwrite = true; - downgrade_write(&inode->i_rwsem); - } ret = dax_iomap_rw(iocb, from, &ext4_iomap_ops); out: - if (!overwrite) - inode_unlock(inode); - else - inode_unlock_shared(inode); + inode_unlock(inode); if (ret > 0) ret = generic_write_sync(iocb, ret); return ret; @@ -213,6 +208,9 @@ ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from) int overwrite = 0; ssize_t ret; + if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) + return -EIO; + #ifdef CONFIG_FS_DAX if (IS_DAX(inode)) return ext4_dax_write_iter(iocb, from); @@ -255,19 +253,20 @@ out: } #ifdef CONFIG_FS_DAX -static int ext4_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf) +static int ext4_dax_huge_fault(struct vm_fault *vmf, + enum page_entry_size pe_size) { int result; - struct inode *inode = file_inode(vma->vm_file); + struct inode *inode = file_inode(vmf->vma->vm_file); struct super_block *sb = inode->i_sb; bool write = vmf->flags & FAULT_FLAG_WRITE; if (write) { sb_start_pagefault(sb); - file_update_time(vma->vm_file); + file_update_time(vmf->vma->vm_file); } down_read(&EXT4_I(inode)->i_mmap_sem); - result = dax_iomap_fault(vma, vmf, &ext4_iomap_ops); + result = dax_iomap_fault(vmf, pe_size, &ext4_iomap_ops); up_read(&EXT4_I(inode)->i_mmap_sem); if (write) sb_end_pagefault(sb); @@ -275,26 +274,9 @@ static int ext4_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf) return result; } -static int ext4_dax_pmd_fault(struct vm_area_struct *vma, unsigned long addr, - pmd_t *pmd, unsigned int flags) +static int ext4_dax_fault(struct vm_fault *vmf) { - int result; - struct inode *inode = file_inode(vma->vm_file); - struct super_block *sb = inode->i_sb; - bool write = flags & FAULT_FLAG_WRITE; - - if (write) { - sb_start_pagefault(sb); - file_update_time(vma->vm_file); - } - down_read(&EXT4_I(inode)->i_mmap_sem); - result = dax_iomap_pmd_fault(vma, addr, pmd, flags, - &ext4_iomap_ops); - up_read(&EXT4_I(inode)->i_mmap_sem); - if (write) - sb_end_pagefault(sb); - - return result; + return ext4_dax_huge_fault(vmf, PE_SIZE_PTE); } /* @@ -306,22 +288,21 @@ static int ext4_dax_pmd_fault(struct vm_area_struct *vma, unsigned long addr, * wp_pfn_shared() fails. Thus fault gets retried and things work out as * desired. */ -static int ext4_dax_pfn_mkwrite(struct vm_area_struct *vma, - struct vm_fault *vmf) +static int ext4_dax_pfn_mkwrite(struct vm_fault *vmf) { - struct inode *inode = file_inode(vma->vm_file); + struct inode *inode = file_inode(vmf->vma->vm_file); struct super_block *sb = inode->i_sb; loff_t size; int ret; sb_start_pagefault(sb); - file_update_time(vma->vm_file); + file_update_time(vmf->vma->vm_file); down_read(&EXT4_I(inode)->i_mmap_sem); size = (i_size_read(inode) + PAGE_SIZE - 1) >> PAGE_SHIFT; if (vmf->pgoff >= size) ret = VM_FAULT_SIGBUS; else - ret = dax_pfn_mkwrite(vma, vmf); + ret = dax_pfn_mkwrite(vmf); up_read(&EXT4_I(inode)->i_mmap_sem); sb_end_pagefault(sb); @@ -330,7 +311,7 @@ static int ext4_dax_pfn_mkwrite(struct vm_area_struct *vma, static const struct vm_operations_struct ext4_dax_vm_ops = { .fault = ext4_dax_fault, - .pmd_fault = ext4_dax_pmd_fault, + .huge_fault = ext4_dax_huge_fault, .page_mkwrite = ext4_dax_fault, .pfn_mkwrite = ext4_dax_pfn_mkwrite, }; @@ -348,6 +329,9 @@ static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma) { struct inode *inode = file->f_mapping->host; + if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) + return -EIO; + if (ext4_encrypted_inode(inode)) { int err = fscrypt_get_encryption_info(inode); if (err) @@ -375,6 +359,9 @@ static int ext4_file_open(struct inode * inode, struct file * filp) char buf[64], *cp; int ret; + if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) + return -EIO; + if (unlikely(!(sbi->s_mount_flags & EXT4_MF_MNTDIR_SAMPLED) && !(sb->s_flags & MS_RDONLY))) { sbi->s_mount_flags |= EXT4_MF_MNTDIR_SAMPLED; @@ -757,7 +744,7 @@ const struct file_operations ext4_file_operations = { const struct inode_operations ext4_file_inode_operations = { .setattr = ext4_setattr, - .getattr = ext4_getattr, + .getattr = ext4_file_getattr, .listxattr = ext4_listxattr, .get_acl = ext4_get_acl, .set_acl = ext4_set_acl, |