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318 lines
8.9 KiB
318 lines
8.9 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* linux/fs/hpfs/inode.c |
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* |
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* Mikulas Patocka ([email protected]), 1998-1999 |
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* |
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* inode VFS functions |
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*/ |
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#include <linux/slab.h> |
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#include <linux/user_namespace.h> |
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#include "hpfs_fn.h" |
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void hpfs_init_inode(struct inode *i) |
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{ |
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struct super_block *sb = i->i_sb; |
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struct hpfs_inode_info *hpfs_inode = hpfs_i(i); |
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i->i_uid = hpfs_sb(sb)->sb_uid; |
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i->i_gid = hpfs_sb(sb)->sb_gid; |
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i->i_mode = hpfs_sb(sb)->sb_mode; |
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i->i_size = -1; |
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i->i_blocks = -1; |
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hpfs_inode->i_dno = 0; |
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hpfs_inode->i_n_secs = 0; |
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hpfs_inode->i_file_sec = 0; |
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hpfs_inode->i_disk_sec = 0; |
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hpfs_inode->i_dpos = 0; |
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hpfs_inode->i_dsubdno = 0; |
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hpfs_inode->i_ea_mode = 0; |
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hpfs_inode->i_ea_uid = 0; |
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hpfs_inode->i_ea_gid = 0; |
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hpfs_inode->i_ea_size = 0; |
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hpfs_inode->i_rddir_off = NULL; |
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hpfs_inode->i_dirty = 0; |
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i->i_ctime.tv_sec = i->i_ctime.tv_nsec = 0; |
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i->i_mtime.tv_sec = i->i_mtime.tv_nsec = 0; |
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i->i_atime.tv_sec = i->i_atime.tv_nsec = 0; |
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} |
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void hpfs_read_inode(struct inode *i) |
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{ |
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struct buffer_head *bh; |
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struct fnode *fnode; |
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struct super_block *sb = i->i_sb; |
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struct hpfs_inode_info *hpfs_inode = hpfs_i(i); |
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void *ea; |
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int ea_size; |
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if (!(fnode = hpfs_map_fnode(sb, i->i_ino, &bh))) { |
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/*i->i_mode |= S_IFREG; |
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i->i_mode &= ~0111; |
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i->i_op = &hpfs_file_iops; |
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i->i_fop = &hpfs_file_ops; |
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clear_nlink(i);*/ |
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make_bad_inode(i); |
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return; |
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} |
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if (hpfs_sb(i->i_sb)->sb_eas) { |
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if ((ea = hpfs_get_ea(i->i_sb, fnode, "UID", &ea_size))) { |
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if (ea_size == 2) { |
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i_uid_write(i, le16_to_cpu(*(__le16*)ea)); |
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hpfs_inode->i_ea_uid = 1; |
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} |
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kfree(ea); |
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} |
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if ((ea = hpfs_get_ea(i->i_sb, fnode, "GID", &ea_size))) { |
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if (ea_size == 2) { |
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i_gid_write(i, le16_to_cpu(*(__le16*)ea)); |
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hpfs_inode->i_ea_gid = 1; |
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} |
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kfree(ea); |
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} |
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if ((ea = hpfs_get_ea(i->i_sb, fnode, "SYMLINK", &ea_size))) { |
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kfree(ea); |
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i->i_mode = S_IFLNK | 0777; |
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i->i_op = &page_symlink_inode_operations; |
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inode_nohighmem(i); |
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i->i_data.a_ops = &hpfs_symlink_aops; |
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set_nlink(i, 1); |
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i->i_size = ea_size; |
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i->i_blocks = 1; |
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brelse(bh); |
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return; |
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} |
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if ((ea = hpfs_get_ea(i->i_sb, fnode, "MODE", &ea_size))) { |
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int rdev = 0; |
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umode_t mode = hpfs_sb(sb)->sb_mode; |
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if (ea_size == 2) { |
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mode = le16_to_cpu(*(__le16*)ea); |
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hpfs_inode->i_ea_mode = 1; |
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} |
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kfree(ea); |
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i->i_mode = mode; |
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if (S_ISBLK(mode) || S_ISCHR(mode)) { |
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if ((ea = hpfs_get_ea(i->i_sb, fnode, "DEV", &ea_size))) { |
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if (ea_size == 4) |
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rdev = le32_to_cpu(*(__le32*)ea); |
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kfree(ea); |
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} |
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} |
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if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { |
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brelse(bh); |
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set_nlink(i, 1); |
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i->i_size = 0; |
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i->i_blocks = 1; |
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init_special_inode(i, mode, |
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new_decode_dev(rdev)); |
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return; |
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} |
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} |
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} |
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if (fnode_is_dir(fnode)) { |
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int n_dnodes, n_subdirs; |
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i->i_mode |= S_IFDIR; |
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i->i_op = &hpfs_dir_iops; |
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i->i_fop = &hpfs_dir_ops; |
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hpfs_inode->i_parent_dir = le32_to_cpu(fnode->up); |
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hpfs_inode->i_dno = le32_to_cpu(fnode->u.external[0].disk_secno); |
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if (hpfs_sb(sb)->sb_chk >= 2) { |
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struct buffer_head *bh0; |
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if (hpfs_map_fnode(sb, hpfs_inode->i_parent_dir, &bh0)) brelse(bh0); |
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} |
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n_dnodes = 0; n_subdirs = 0; |
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hpfs_count_dnodes(i->i_sb, hpfs_inode->i_dno, &n_dnodes, &n_subdirs, NULL); |
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i->i_blocks = 4 * n_dnodes; |
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i->i_size = 2048 * n_dnodes; |
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set_nlink(i, 2 + n_subdirs); |
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} else { |
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i->i_mode |= S_IFREG; |
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if (!hpfs_inode->i_ea_mode) i->i_mode &= ~0111; |
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i->i_op = &hpfs_file_iops; |
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i->i_fop = &hpfs_file_ops; |
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set_nlink(i, 1); |
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i->i_size = le32_to_cpu(fnode->file_size); |
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i->i_blocks = ((i->i_size + 511) >> 9) + 1; |
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i->i_data.a_ops = &hpfs_aops; |
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hpfs_i(i)->mmu_private = i->i_size; |
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} |
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brelse(bh); |
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} |
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static void hpfs_write_inode_ea(struct inode *i, struct fnode *fnode) |
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{ |
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struct hpfs_inode_info *hpfs_inode = hpfs_i(i); |
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/*if (le32_to_cpu(fnode->acl_size_l) || le16_to_cpu(fnode->acl_size_s)) { |
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Some unknown structures like ACL may be in fnode, |
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we'd better not overwrite them |
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hpfs_error(i->i_sb, "fnode %08x has some unknown HPFS386 structures", i->i_ino); |
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} else*/ if (hpfs_sb(i->i_sb)->sb_eas >= 2) { |
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__le32 ea; |
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if (!uid_eq(i->i_uid, hpfs_sb(i->i_sb)->sb_uid) || hpfs_inode->i_ea_uid) { |
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ea = cpu_to_le32(i_uid_read(i)); |
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hpfs_set_ea(i, fnode, "UID", (char*)&ea, 2); |
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hpfs_inode->i_ea_uid = 1; |
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} |
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if (!gid_eq(i->i_gid, hpfs_sb(i->i_sb)->sb_gid) || hpfs_inode->i_ea_gid) { |
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ea = cpu_to_le32(i_gid_read(i)); |
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hpfs_set_ea(i, fnode, "GID", (char *)&ea, 2); |
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hpfs_inode->i_ea_gid = 1; |
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} |
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if (!S_ISLNK(i->i_mode)) |
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if ((i->i_mode != ((hpfs_sb(i->i_sb)->sb_mode & ~(S_ISDIR(i->i_mode) ? 0 : 0111)) |
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| (S_ISDIR(i->i_mode) ? S_IFDIR : S_IFREG)) |
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&& i->i_mode != ((hpfs_sb(i->i_sb)->sb_mode & ~(S_ISDIR(i->i_mode) ? 0222 : 0333)) |
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| (S_ISDIR(i->i_mode) ? S_IFDIR : S_IFREG))) || hpfs_inode->i_ea_mode) { |
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ea = cpu_to_le32(i->i_mode); |
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/* sick, but legal */ |
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hpfs_set_ea(i, fnode, "MODE", (char *)&ea, 2); |
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hpfs_inode->i_ea_mode = 1; |
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} |
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if (S_ISBLK(i->i_mode) || S_ISCHR(i->i_mode)) { |
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ea = cpu_to_le32(new_encode_dev(i->i_rdev)); |
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hpfs_set_ea(i, fnode, "DEV", (char *)&ea, 4); |
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} |
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} |
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} |
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void hpfs_write_inode(struct inode *i) |
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{ |
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struct hpfs_inode_info *hpfs_inode = hpfs_i(i); |
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struct inode *parent; |
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if (i->i_ino == hpfs_sb(i->i_sb)->sb_root) return; |
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if (hpfs_inode->i_rddir_off && !atomic_read(&i->i_count)) { |
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if (*hpfs_inode->i_rddir_off) |
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pr_err("write_inode: some position still there\n"); |
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kfree(hpfs_inode->i_rddir_off); |
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hpfs_inode->i_rddir_off = NULL; |
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} |
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if (!i->i_nlink) { |
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return; |
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} |
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parent = iget_locked(i->i_sb, hpfs_inode->i_parent_dir); |
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if (parent) { |
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hpfs_inode->i_dirty = 0; |
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if (parent->i_state & I_NEW) { |
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hpfs_init_inode(parent); |
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hpfs_read_inode(parent); |
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unlock_new_inode(parent); |
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} |
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hpfs_write_inode_nolock(i); |
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iput(parent); |
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} |
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} |
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void hpfs_write_inode_nolock(struct inode *i) |
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{ |
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struct hpfs_inode_info *hpfs_inode = hpfs_i(i); |
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struct buffer_head *bh; |
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struct fnode *fnode; |
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struct quad_buffer_head qbh; |
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struct hpfs_dirent *de; |
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if (i->i_ino == hpfs_sb(i->i_sb)->sb_root) return; |
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if (!(fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh))) return; |
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if (i->i_ino != hpfs_sb(i->i_sb)->sb_root && i->i_nlink) { |
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if (!(de = map_fnode_dirent(i->i_sb, i->i_ino, fnode, &qbh))) { |
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brelse(bh); |
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return; |
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} |
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} else de = NULL; |
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if (S_ISREG(i->i_mode)) { |
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fnode->file_size = cpu_to_le32(i->i_size); |
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if (de) de->file_size = cpu_to_le32(i->i_size); |
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} else if (S_ISDIR(i->i_mode)) { |
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fnode->file_size = cpu_to_le32(0); |
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if (de) de->file_size = cpu_to_le32(0); |
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} |
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hpfs_write_inode_ea(i, fnode); |
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if (de) { |
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de->write_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_mtime.tv_sec)); |
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de->read_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_atime.tv_sec)); |
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de->creation_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_ctime.tv_sec)); |
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de->read_only = !(i->i_mode & 0222); |
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de->ea_size = cpu_to_le32(hpfs_inode->i_ea_size); |
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hpfs_mark_4buffers_dirty(&qbh); |
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hpfs_brelse4(&qbh); |
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} |
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if (S_ISDIR(i->i_mode)) { |
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if ((de = map_dirent(i, hpfs_inode->i_dno, "\001\001", 2, NULL, &qbh))) { |
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de->write_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_mtime.tv_sec)); |
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de->read_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_atime.tv_sec)); |
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de->creation_date = cpu_to_le32(gmt_to_local(i->i_sb, i->i_ctime.tv_sec)); |
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de->read_only = !(i->i_mode & 0222); |
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de->ea_size = cpu_to_le32(/*hpfs_inode->i_ea_size*/0); |
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de->file_size = cpu_to_le32(0); |
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hpfs_mark_4buffers_dirty(&qbh); |
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hpfs_brelse4(&qbh); |
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} else |
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hpfs_error(i->i_sb, |
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"directory %08lx doesn't have '.' entry", |
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(unsigned long)i->i_ino); |
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} |
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mark_buffer_dirty(bh); |
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brelse(bh); |
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} |
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int hpfs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, |
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struct iattr *attr) |
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{ |
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struct inode *inode = d_inode(dentry); |
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int error = -EINVAL; |
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hpfs_lock(inode->i_sb); |
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if (inode->i_ino == hpfs_sb(inode->i_sb)->sb_root) |
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goto out_unlock; |
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if ((attr->ia_valid & ATTR_UID) && |
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from_kuid(&init_user_ns, attr->ia_uid) >= 0x10000) |
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goto out_unlock; |
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if ((attr->ia_valid & ATTR_GID) && |
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from_kgid(&init_user_ns, attr->ia_gid) >= 0x10000) |
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goto out_unlock; |
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if ((attr->ia_valid & ATTR_SIZE) && attr->ia_size > inode->i_size) |
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goto out_unlock; |
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error = setattr_prepare(&init_user_ns, dentry, attr); |
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if (error) |
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goto out_unlock; |
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if ((attr->ia_valid & ATTR_SIZE) && |
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attr->ia_size != i_size_read(inode)) { |
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error = inode_newsize_ok(inode, attr->ia_size); |
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if (error) |
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goto out_unlock; |
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truncate_setsize(inode, attr->ia_size); |
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hpfs_truncate(inode); |
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} |
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setattr_copy(&init_user_ns, inode, attr); |
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hpfs_write_inode(inode); |
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out_unlock: |
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hpfs_unlock(inode->i_sb); |
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return error; |
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} |
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void hpfs_write_if_changed(struct inode *inode) |
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{ |
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struct hpfs_inode_info *hpfs_inode = hpfs_i(inode); |
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if (hpfs_inode->i_dirty) |
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hpfs_write_inode(inode); |
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} |
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void hpfs_evict_inode(struct inode *inode) |
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{ |
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truncate_inode_pages_final(&inode->i_data); |
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clear_inode(inode); |
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if (!inode->i_nlink) { |
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hpfs_lock(inode->i_sb); |
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hpfs_remove_fnode(inode->i_sb, inode->i_ino); |
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hpfs_unlock(inode->i_sb); |
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} |
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}
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