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208 lines
5.3 KiB
208 lines
5.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* linux/fs/ext2/file.c |
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* |
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* Copyright (C) 1992, 1993, 1994, 1995 |
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* Remy Card ([email protected]) |
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* Laboratoire MASI - Institut Blaise Pascal |
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* Universite Pierre et Marie Curie (Paris VI) |
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* |
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* from |
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* |
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* linux/fs/minix/file.c |
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* |
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* Copyright (C) 1991, 1992 Linus Torvalds |
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* |
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* ext2 fs regular file handling primitives |
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* |
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* 64-bit file support on 64-bit platforms by Jakub Jelinek |
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* ([email protected]) |
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*/ |
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#include <linux/time.h> |
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#include <linux/pagemap.h> |
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#include <linux/dax.h> |
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#include <linux/quotaops.h> |
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#include <linux/iomap.h> |
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#include <linux/uio.h> |
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#include "ext2.h" |
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#include "xattr.h" |
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#include "acl.h" |
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#ifdef CONFIG_FS_DAX |
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static ssize_t ext2_dax_read_iter(struct kiocb *iocb, struct iov_iter *to) |
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{ |
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struct inode *inode = iocb->ki_filp->f_mapping->host; |
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ssize_t ret; |
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if (!iov_iter_count(to)) |
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return 0; /* skip atime */ |
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inode_lock_shared(inode); |
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ret = dax_iomap_rw(iocb, to, &ext2_iomap_ops); |
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inode_unlock_shared(inode); |
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file_accessed(iocb->ki_filp); |
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return ret; |
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} |
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static ssize_t ext2_dax_write_iter(struct kiocb *iocb, struct iov_iter *from) |
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{ |
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struct file *file = iocb->ki_filp; |
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struct inode *inode = file->f_mapping->host; |
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ssize_t ret; |
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inode_lock(inode); |
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ret = generic_write_checks(iocb, from); |
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if (ret <= 0) |
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goto out_unlock; |
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ret = file_remove_privs(file); |
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if (ret) |
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goto out_unlock; |
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ret = file_update_time(file); |
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if (ret) |
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goto out_unlock; |
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ret = dax_iomap_rw(iocb, from, &ext2_iomap_ops); |
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if (ret > 0 && iocb->ki_pos > i_size_read(inode)) { |
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i_size_write(inode, iocb->ki_pos); |
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mark_inode_dirty(inode); |
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} |
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out_unlock: |
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inode_unlock(inode); |
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if (ret > 0) |
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ret = generic_write_sync(iocb, ret); |
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return ret; |
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} |
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/* |
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* The lock ordering for ext2 DAX fault paths is: |
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* |
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* mmap_lock (MM) |
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* sb_start_pagefault (vfs, freeze) |
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* address_space->invalidate_lock |
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* address_space->i_mmap_rwsem or page_lock (mutually exclusive in DAX) |
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* ext2_inode_info->truncate_mutex |
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* |
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* The default page_lock and i_size verification done by non-DAX fault paths |
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* is sufficient because ext2 doesn't support hole punching. |
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*/ |
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static vm_fault_t ext2_dax_fault(struct vm_fault *vmf) |
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{ |
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struct inode *inode = file_inode(vmf->vma->vm_file); |
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vm_fault_t ret; |
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bool write = (vmf->flags & FAULT_FLAG_WRITE) && |
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(vmf->vma->vm_flags & VM_SHARED); |
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if (write) { |
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sb_start_pagefault(inode->i_sb); |
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file_update_time(vmf->vma->vm_file); |
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} |
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filemap_invalidate_lock_shared(inode->i_mapping); |
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ret = dax_iomap_fault(vmf, PE_SIZE_PTE, NULL, NULL, &ext2_iomap_ops); |
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filemap_invalidate_unlock_shared(inode->i_mapping); |
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if (write) |
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sb_end_pagefault(inode->i_sb); |
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return ret; |
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} |
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static const struct vm_operations_struct ext2_dax_vm_ops = { |
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.fault = ext2_dax_fault, |
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/* |
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* .huge_fault is not supported for DAX because allocation in ext2 |
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* cannot be reliably aligned to huge page sizes and so pmd faults |
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* will always fail and fail back to regular faults. |
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*/ |
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.page_mkwrite = ext2_dax_fault, |
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.pfn_mkwrite = ext2_dax_fault, |
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}; |
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static int ext2_file_mmap(struct file *file, struct vm_area_struct *vma) |
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{ |
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if (!IS_DAX(file_inode(file))) |
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return generic_file_mmap(file, vma); |
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file_accessed(file); |
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vma->vm_ops = &ext2_dax_vm_ops; |
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return 0; |
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} |
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#else |
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#define ext2_file_mmap generic_file_mmap |
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#endif |
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/* |
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* Called when filp is released. This happens when all file descriptors |
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* for a single struct file are closed. Note that different open() calls |
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* for the same file yield different struct file structures. |
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*/ |
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static int ext2_release_file (struct inode * inode, struct file * filp) |
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{ |
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if (filp->f_mode & FMODE_WRITE) { |
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mutex_lock(&EXT2_I(inode)->truncate_mutex); |
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ext2_discard_reservation(inode); |
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mutex_unlock(&EXT2_I(inode)->truncate_mutex); |
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} |
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return 0; |
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} |
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int ext2_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
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{ |
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int ret; |
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struct super_block *sb = file->f_mapping->host->i_sb; |
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ret = generic_file_fsync(file, start, end, datasync); |
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if (ret == -EIO) |
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/* We don't really know where the IO error happened... */ |
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ext2_error(sb, __func__, |
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"detected IO error when writing metadata buffers"); |
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return ret; |
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} |
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static ssize_t ext2_file_read_iter(struct kiocb *iocb, struct iov_iter *to) |
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{ |
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#ifdef CONFIG_FS_DAX |
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if (IS_DAX(iocb->ki_filp->f_mapping->host)) |
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return ext2_dax_read_iter(iocb, to); |
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#endif |
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return generic_file_read_iter(iocb, to); |
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} |
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static ssize_t ext2_file_write_iter(struct kiocb *iocb, struct iov_iter *from) |
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{ |
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#ifdef CONFIG_FS_DAX |
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if (IS_DAX(iocb->ki_filp->f_mapping->host)) |
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return ext2_dax_write_iter(iocb, from); |
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#endif |
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return generic_file_write_iter(iocb, from); |
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} |
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const struct file_operations ext2_file_operations = { |
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.llseek = generic_file_llseek, |
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.read_iter = ext2_file_read_iter, |
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.write_iter = ext2_file_write_iter, |
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.unlocked_ioctl = ext2_ioctl, |
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#ifdef CONFIG_COMPAT |
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.compat_ioctl = ext2_compat_ioctl, |
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#endif |
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.mmap = ext2_file_mmap, |
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.open = dquot_file_open, |
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.release = ext2_release_file, |
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.fsync = ext2_fsync, |
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.get_unmapped_area = thp_get_unmapped_area, |
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.splice_read = generic_file_splice_read, |
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.splice_write = iter_file_splice_write, |
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}; |
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const struct inode_operations ext2_file_inode_operations = { |
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.listxattr = ext2_listxattr, |
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.getattr = ext2_getattr, |
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.setattr = ext2_setattr, |
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.get_acl = ext2_get_acl, |
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.set_acl = ext2_set_acl, |
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.fiemap = ext2_fiemap, |
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.fileattr_get = ext2_fileattr_get, |
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.fileattr_set = ext2_fileattr_set, |
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};
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