418 строки
10 KiB
C
418 строки
10 KiB
C
/*
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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/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 = 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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/* fall through */
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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_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) * (24 * 60 * 60) +
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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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((8 * 365 + 2) * 24 * 60 * 60)) +
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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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secs_to_datestamp(inode->i_mtime.tv_sec,&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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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 dentry *dentry, 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 = inode_change_ok(inode,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(inode, attr);
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mark_inode_dirty(inode);
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if (attr->ia_valid & ATTR_MODE)
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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_SEC;
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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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