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422 lines
11 KiB
422 lines
11 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* linux/fs/affs/inode.c |
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* |
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* (c) 1996 Hans-Joachim Widmaier - Rewritten |
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* |
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* (C) 1993 Ray Burr - Modified for Amiga FFS filesystem. |
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* |
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* (C) 1992 Eric Youngdale Modified for ISO9660 filesystem. |
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* |
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* (C) 1991 Linus Torvalds - minix filesystem |
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*/ |
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#include <linux/sched.h> |
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#include <linux/cred.h> |
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#include <linux/gfp.h> |
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#include "affs.h" |
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struct inode *affs_iget(struct super_block *sb, unsigned long ino) |
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{ |
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struct affs_sb_info *sbi = AFFS_SB(sb); |
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struct buffer_head *bh; |
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struct affs_tail *tail; |
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struct inode *inode; |
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u32 block; |
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u32 size; |
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u32 prot; |
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u16 id; |
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inode = iget_locked(sb, ino); |
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if (!inode) |
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return ERR_PTR(-ENOMEM); |
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if (!(inode->i_state & I_NEW)) |
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return inode; |
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pr_debug("affs_iget(%lu)\n", inode->i_ino); |
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block = inode->i_ino; |
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bh = affs_bread(sb, block); |
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if (!bh) { |
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affs_warning(sb, "read_inode", "Cannot read block %d", block); |
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goto bad_inode; |
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} |
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if (affs_checksum_block(sb, bh) || be32_to_cpu(AFFS_HEAD(bh)->ptype) != T_SHORT) { |
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affs_warning(sb,"read_inode", |
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"Checksum or type (ptype=%d) error on inode %d", |
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AFFS_HEAD(bh)->ptype, block); |
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goto bad_inode; |
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} |
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tail = AFFS_TAIL(sb, bh); |
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prot = be32_to_cpu(tail->protect); |
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inode->i_size = 0; |
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set_nlink(inode, 1); |
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inode->i_mode = 0; |
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AFFS_I(inode)->i_extcnt = 1; |
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AFFS_I(inode)->i_ext_last = ~1; |
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AFFS_I(inode)->i_protect = prot; |
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atomic_set(&AFFS_I(inode)->i_opencnt, 0); |
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AFFS_I(inode)->i_blkcnt = 0; |
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AFFS_I(inode)->i_lc = NULL; |
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AFFS_I(inode)->i_lc_size = 0; |
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AFFS_I(inode)->i_lc_shift = 0; |
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AFFS_I(inode)->i_lc_mask = 0; |
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AFFS_I(inode)->i_ac = NULL; |
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AFFS_I(inode)->i_ext_bh = NULL; |
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AFFS_I(inode)->mmu_private = 0; |
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AFFS_I(inode)->i_lastalloc = 0; |
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AFFS_I(inode)->i_pa_cnt = 0; |
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if (affs_test_opt(sbi->s_flags, SF_SETMODE)) |
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inode->i_mode = sbi->s_mode; |
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else |
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inode->i_mode = affs_prot_to_mode(prot); |
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id = be16_to_cpu(tail->uid); |
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if (id == 0 || affs_test_opt(sbi->s_flags, SF_SETUID)) |
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inode->i_uid = sbi->s_uid; |
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else if (id == 0xFFFF && affs_test_opt(sbi->s_flags, SF_MUFS)) |
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i_uid_write(inode, 0); |
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else |
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i_uid_write(inode, id); |
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id = be16_to_cpu(tail->gid); |
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if (id == 0 || affs_test_opt(sbi->s_flags, SF_SETGID)) |
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inode->i_gid = sbi->s_gid; |
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else if (id == 0xFFFF && affs_test_opt(sbi->s_flags, SF_MUFS)) |
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i_gid_write(inode, 0); |
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else |
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i_gid_write(inode, id); |
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switch (be32_to_cpu(tail->stype)) { |
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case ST_ROOT: |
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inode->i_uid = sbi->s_uid; |
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inode->i_gid = sbi->s_gid; |
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fallthrough; |
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case ST_USERDIR: |
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if (be32_to_cpu(tail->stype) == ST_USERDIR || |
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affs_test_opt(sbi->s_flags, SF_SETMODE)) { |
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if (inode->i_mode & S_IRUSR) |
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inode->i_mode |= S_IXUSR; |
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if (inode->i_mode & S_IRGRP) |
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inode->i_mode |= S_IXGRP; |
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if (inode->i_mode & S_IROTH) |
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inode->i_mode |= S_IXOTH; |
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inode->i_mode |= S_IFDIR; |
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} else |
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inode->i_mode = S_IRUGO | S_IXUGO | S_IWUSR | S_IFDIR; |
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/* Maybe it should be controlled by mount parameter? */ |
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//inode->i_mode |= S_ISVTX; |
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inode->i_op = &affs_dir_inode_operations; |
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inode->i_fop = &affs_dir_operations; |
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break; |
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case ST_LINKDIR: |
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#if 0 |
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affs_warning(sb, "read_inode", "inode is LINKDIR"); |
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goto bad_inode; |
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#else |
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inode->i_mode |= S_IFDIR; |
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/* ... and leave ->i_op and ->i_fop pointing to empty */ |
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break; |
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#endif |
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case ST_LINKFILE: |
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affs_warning(sb, "read_inode", "inode is LINKFILE"); |
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goto bad_inode; |
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case ST_FILE: |
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size = be32_to_cpu(tail->size); |
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inode->i_mode |= S_IFREG; |
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AFFS_I(inode)->mmu_private = inode->i_size = size; |
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if (inode->i_size) { |
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AFFS_I(inode)->i_blkcnt = (size - 1) / |
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sbi->s_data_blksize + 1; |
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AFFS_I(inode)->i_extcnt = (AFFS_I(inode)->i_blkcnt - 1) / |
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sbi->s_hashsize + 1; |
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} |
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if (tail->link_chain) |
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set_nlink(inode, 2); |
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inode->i_mapping->a_ops = affs_test_opt(sbi->s_flags, SF_OFS) ? |
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&affs_aops_ofs : &affs_aops; |
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inode->i_op = &affs_file_inode_operations; |
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inode->i_fop = &affs_file_operations; |
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break; |
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case ST_SOFTLINK: |
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inode->i_size = strlen((char *)AFFS_HEAD(bh)->table); |
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inode->i_mode |= S_IFLNK; |
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inode_nohighmem(inode); |
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inode->i_op = &affs_symlink_inode_operations; |
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inode->i_data.a_ops = &affs_symlink_aops; |
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break; |
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} |
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inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec |
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= (be32_to_cpu(tail->change.days) * 86400LL + |
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be32_to_cpu(tail->change.mins) * 60 + |
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be32_to_cpu(tail->change.ticks) / 50 + |
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AFFS_EPOCH_DELTA) + |
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sys_tz.tz_minuteswest * 60; |
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inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = inode->i_atime.tv_nsec = 0; |
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affs_brelse(bh); |
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unlock_new_inode(inode); |
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return inode; |
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bad_inode: |
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affs_brelse(bh); |
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iget_failed(inode); |
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return ERR_PTR(-EIO); |
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} |
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int |
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affs_write_inode(struct inode *inode, struct writeback_control *wbc) |
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{ |
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struct super_block *sb = inode->i_sb; |
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struct buffer_head *bh; |
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struct affs_tail *tail; |
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uid_t uid; |
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gid_t gid; |
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pr_debug("write_inode(%lu)\n", inode->i_ino); |
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if (!inode->i_nlink) |
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// possibly free block |
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return 0; |
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bh = affs_bread(sb, inode->i_ino); |
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if (!bh) { |
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affs_error(sb,"write_inode","Cannot read block %lu",inode->i_ino); |
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return -EIO; |
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} |
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tail = AFFS_TAIL(sb, bh); |
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if (tail->stype == cpu_to_be32(ST_ROOT)) { |
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affs_secs_to_datestamp(inode->i_mtime.tv_sec, |
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&AFFS_ROOT_TAIL(sb, bh)->root_change); |
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} else { |
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tail->protect = cpu_to_be32(AFFS_I(inode)->i_protect); |
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tail->size = cpu_to_be32(inode->i_size); |
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affs_secs_to_datestamp(inode->i_mtime.tv_sec, &tail->change); |
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if (!(inode->i_ino == AFFS_SB(sb)->s_root_block)) { |
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uid = i_uid_read(inode); |
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gid = i_gid_read(inode); |
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if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_MUFS)) { |
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if (uid == 0 || uid == 0xFFFF) |
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uid = uid ^ ~0; |
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if (gid == 0 || gid == 0xFFFF) |
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gid = gid ^ ~0; |
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} |
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if (!affs_test_opt(AFFS_SB(sb)->s_flags, SF_SETUID)) |
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tail->uid = cpu_to_be16(uid); |
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if (!affs_test_opt(AFFS_SB(sb)->s_flags, SF_SETGID)) |
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tail->gid = cpu_to_be16(gid); |
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} |
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} |
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affs_fix_checksum(sb, bh); |
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mark_buffer_dirty_inode(bh, inode); |
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affs_brelse(bh); |
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affs_free_prealloc(inode); |
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return 0; |
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} |
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int |
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affs_notify_change(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; |
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pr_debug("notify_change(%lu,0x%x)\n", inode->i_ino, attr->ia_valid); |
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error = setattr_prepare(&init_user_ns, dentry, attr); |
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if (error) |
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goto out; |
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if (((attr->ia_valid & ATTR_UID) && |
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affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_SETUID)) || |
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((attr->ia_valid & ATTR_GID) && |
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affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_SETGID)) || |
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((attr->ia_valid & ATTR_MODE) && |
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(AFFS_SB(inode->i_sb)->s_flags & |
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(AFFS_MOUNT_SF_SETMODE | AFFS_MOUNT_SF_IMMUTABLE)))) { |
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if (!affs_test_opt(AFFS_SB(inode->i_sb)->s_flags, SF_QUIET)) |
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error = -EPERM; |
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goto out; |
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} |
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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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return error; |
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truncate_setsize(inode, attr->ia_size); |
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affs_truncate(inode); |
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} |
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setattr_copy(&init_user_ns, inode, attr); |
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mark_inode_dirty(inode); |
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if (attr->ia_valid & ATTR_MODE) |
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affs_mode_to_prot(inode); |
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out: |
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return error; |
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} |
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void |
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affs_evict_inode(struct inode *inode) |
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{ |
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unsigned long cache_page; |
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pr_debug("evict_inode(ino=%lu, nlink=%u)\n", |
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inode->i_ino, inode->i_nlink); |
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truncate_inode_pages_final(&inode->i_data); |
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if (!inode->i_nlink) { |
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inode->i_size = 0; |
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affs_truncate(inode); |
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} |
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invalidate_inode_buffers(inode); |
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clear_inode(inode); |
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affs_free_prealloc(inode); |
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cache_page = (unsigned long)AFFS_I(inode)->i_lc; |
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if (cache_page) { |
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pr_debug("freeing ext cache\n"); |
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AFFS_I(inode)->i_lc = NULL; |
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AFFS_I(inode)->i_ac = NULL; |
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free_page(cache_page); |
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} |
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affs_brelse(AFFS_I(inode)->i_ext_bh); |
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AFFS_I(inode)->i_ext_last = ~1; |
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AFFS_I(inode)->i_ext_bh = NULL; |
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if (!inode->i_nlink) |
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affs_free_block(inode->i_sb, inode->i_ino); |
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} |
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struct inode * |
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affs_new_inode(struct inode *dir) |
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{ |
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struct super_block *sb = dir->i_sb; |
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struct inode *inode; |
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u32 block; |
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struct buffer_head *bh; |
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if (!(inode = new_inode(sb))) |
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goto err_inode; |
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if (!(block = affs_alloc_block(dir, dir->i_ino))) |
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goto err_block; |
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bh = affs_getzeroblk(sb, block); |
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if (!bh) |
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goto err_bh; |
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mark_buffer_dirty_inode(bh, inode); |
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affs_brelse(bh); |
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inode->i_uid = current_fsuid(); |
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inode->i_gid = current_fsgid(); |
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inode->i_ino = block; |
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set_nlink(inode, 1); |
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inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode); |
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atomic_set(&AFFS_I(inode)->i_opencnt, 0); |
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AFFS_I(inode)->i_blkcnt = 0; |
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AFFS_I(inode)->i_lc = NULL; |
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AFFS_I(inode)->i_lc_size = 0; |
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AFFS_I(inode)->i_lc_shift = 0; |
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AFFS_I(inode)->i_lc_mask = 0; |
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AFFS_I(inode)->i_ac = NULL; |
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AFFS_I(inode)->i_ext_bh = NULL; |
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AFFS_I(inode)->mmu_private = 0; |
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AFFS_I(inode)->i_protect = 0; |
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AFFS_I(inode)->i_lastalloc = 0; |
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AFFS_I(inode)->i_pa_cnt = 0; |
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AFFS_I(inode)->i_extcnt = 1; |
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AFFS_I(inode)->i_ext_last = ~1; |
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insert_inode_hash(inode); |
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return inode; |
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err_bh: |
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affs_free_block(sb, block); |
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err_block: |
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iput(inode); |
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err_inode: |
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return NULL; |
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} |
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/* |
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* Add an entry to a directory. Create the header block |
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* and insert it into the hash table. |
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*/ |
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int |
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affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type) |
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{ |
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struct super_block *sb = dir->i_sb; |
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struct buffer_head *inode_bh = NULL; |
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struct buffer_head *bh; |
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u32 block = 0; |
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int retval; |
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pr_debug("%s(dir=%lu, inode=%lu, \"%pd\", type=%d)\n", __func__, |
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dir->i_ino, inode->i_ino, dentry, type); |
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retval = -EIO; |
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bh = affs_bread(sb, inode->i_ino); |
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if (!bh) |
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goto done; |
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affs_lock_link(inode); |
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switch (type) { |
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case ST_LINKFILE: |
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case ST_LINKDIR: |
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retval = -ENOSPC; |
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block = affs_alloc_block(dir, dir->i_ino); |
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if (!block) |
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goto err; |
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retval = -EIO; |
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inode_bh = bh; |
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bh = affs_getzeroblk(sb, block); |
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if (!bh) |
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goto err; |
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break; |
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default: |
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break; |
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} |
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AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT); |
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AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr); |
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affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry); |
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AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type); |
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AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino); |
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if (inode_bh) { |
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__be32 chain; |
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chain = AFFS_TAIL(sb, inode_bh)->link_chain; |
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AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino); |
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AFFS_TAIL(sb, bh)->link_chain = chain; |
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AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block); |
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affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain)); |
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mark_buffer_dirty_inode(inode_bh, inode); |
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set_nlink(inode, 2); |
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ihold(inode); |
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} |
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affs_fix_checksum(sb, bh); |
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mark_buffer_dirty_inode(bh, inode); |
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dentry->d_fsdata = (void *)(long)bh->b_blocknr; |
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affs_lock_dir(dir); |
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retval = affs_insert_hash(dir, bh); |
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mark_buffer_dirty_inode(bh, inode); |
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affs_unlock_dir(dir); |
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affs_unlock_link(inode); |
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d_instantiate(dentry, inode); |
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done: |
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affs_brelse(inode_bh); |
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affs_brelse(bh); |
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return retval; |
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err: |
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if (block) |
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affs_free_block(sb, block); |
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affs_unlock_link(inode); |
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goto done; |
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}
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