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355 lines
9.3 KiB
355 lines
9.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* linux/fs/ufs/ialloc.c |
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* |
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* Copyright (c) 1998 |
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* Daniel Pirkl <[email protected]> |
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* Charles University, Faculty of Mathematics and Physics |
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* |
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* from |
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* |
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* linux/fs/ext2/ialloc.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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* BSD ufs-inspired inode and directory allocation by |
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* Stephen Tweedie ([email protected]), 1993 |
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* Big-endian to little-endian byte-swapping/bitmaps by |
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* David S. Miller ([email protected]), 1995 |
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* |
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* UFS2 write support added by |
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* Evgeniy Dushistov <[email protected]>, 2007 |
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*/ |
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#include <linux/fs.h> |
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#include <linux/time.h> |
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#include <linux/stat.h> |
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#include <linux/string.h> |
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#include <linux/buffer_head.h> |
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#include <linux/sched.h> |
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#include <linux/bitops.h> |
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#include <asm/byteorder.h> |
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#include "ufs_fs.h" |
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#include "ufs.h" |
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#include "swab.h" |
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#include "util.h" |
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/* |
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* NOTE! When we get the inode, we're the only people |
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* that have access to it, and as such there are no |
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* race conditions we have to worry about. The inode |
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* is not on the hash-lists, and it cannot be reached |
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* through the filesystem because the directory entry |
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* has been deleted earlier. |
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* |
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* HOWEVER: we must make sure that we get no aliases, |
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* which means that we have to call "clear_inode()" |
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* _before_ we mark the inode not in use in the inode |
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* bitmaps. Otherwise a newly created file might use |
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* the same inode number (not actually the same pointer |
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* though), and then we'd have two inodes sharing the |
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* same inode number and space on the harddisk. |
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*/ |
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void ufs_free_inode (struct inode * inode) |
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{ |
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struct super_block * sb; |
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struct ufs_sb_private_info * uspi; |
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struct ufs_cg_private_info * ucpi; |
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struct ufs_cylinder_group * ucg; |
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int is_directory; |
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unsigned ino, cg, bit; |
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UFSD("ENTER, ino %lu\n", inode->i_ino); |
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sb = inode->i_sb; |
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uspi = UFS_SB(sb)->s_uspi; |
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ino = inode->i_ino; |
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mutex_lock(&UFS_SB(sb)->s_lock); |
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if (!((ino > 1) && (ino < (uspi->s_ncg * uspi->s_ipg )))) { |
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ufs_warning(sb, "ufs_free_inode", "reserved inode or nonexistent inode %u\n", ino); |
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mutex_unlock(&UFS_SB(sb)->s_lock); |
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return; |
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} |
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cg = ufs_inotocg (ino); |
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bit = ufs_inotocgoff (ino); |
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ucpi = ufs_load_cylinder (sb, cg); |
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if (!ucpi) { |
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mutex_unlock(&UFS_SB(sb)->s_lock); |
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return; |
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} |
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ucg = ubh_get_ucg(UCPI_UBH(ucpi)); |
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if (!ufs_cg_chkmagic(sb, ucg)) |
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ufs_panic (sb, "ufs_free_fragments", "internal error, bad cg magic number"); |
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ucg->cg_time = ufs_get_seconds(sb); |
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is_directory = S_ISDIR(inode->i_mode); |
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if (ubh_isclr (UCPI_UBH(ucpi), ucpi->c_iusedoff, bit)) |
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ufs_error(sb, "ufs_free_inode", "bit already cleared for inode %u", ino); |
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else { |
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ubh_clrbit (UCPI_UBH(ucpi), ucpi->c_iusedoff, bit); |
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if (ino < ucpi->c_irotor) |
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ucpi->c_irotor = ino; |
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fs32_add(sb, &ucg->cg_cs.cs_nifree, 1); |
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uspi->cs_total.cs_nifree++; |
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fs32_add(sb, &UFS_SB(sb)->fs_cs(cg).cs_nifree, 1); |
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if (is_directory) { |
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fs32_sub(sb, &ucg->cg_cs.cs_ndir, 1); |
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uspi->cs_total.cs_ndir--; |
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fs32_sub(sb, &UFS_SB(sb)->fs_cs(cg).cs_ndir, 1); |
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} |
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} |
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ubh_mark_buffer_dirty (USPI_UBH(uspi)); |
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ubh_mark_buffer_dirty (UCPI_UBH(ucpi)); |
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if (sb->s_flags & SB_SYNCHRONOUS) |
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ubh_sync_block(UCPI_UBH(ucpi)); |
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ufs_mark_sb_dirty(sb); |
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mutex_unlock(&UFS_SB(sb)->s_lock); |
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UFSD("EXIT\n"); |
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} |
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/* |
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* Nullify new chunk of inodes, |
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* BSD people also set ui_gen field of inode |
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* during nullification, but we not care about |
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* that because of linux ufs do not support NFS |
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*/ |
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static void ufs2_init_inodes_chunk(struct super_block *sb, |
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struct ufs_cg_private_info *ucpi, |
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struct ufs_cylinder_group *ucg) |
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{ |
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struct buffer_head *bh; |
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struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi; |
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sector_t beg = uspi->s_sbbase + |
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ufs_inotofsba(ucpi->c_cgx * uspi->s_ipg + |
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fs32_to_cpu(sb, ucg->cg_u.cg_u2.cg_initediblk)); |
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sector_t end = beg + uspi->s_fpb; |
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UFSD("ENTER cgno %d\n", ucpi->c_cgx); |
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for (; beg < end; ++beg) { |
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bh = sb_getblk(sb, beg); |
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lock_buffer(bh); |
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memset(bh->b_data, 0, sb->s_blocksize); |
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set_buffer_uptodate(bh); |
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mark_buffer_dirty(bh); |
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unlock_buffer(bh); |
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if (sb->s_flags & SB_SYNCHRONOUS) |
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sync_dirty_buffer(bh); |
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brelse(bh); |
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} |
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fs32_add(sb, &ucg->cg_u.cg_u2.cg_initediblk, uspi->s_inopb); |
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ubh_mark_buffer_dirty(UCPI_UBH(ucpi)); |
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if (sb->s_flags & SB_SYNCHRONOUS) |
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ubh_sync_block(UCPI_UBH(ucpi)); |
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UFSD("EXIT\n"); |
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} |
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/* |
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* There are two policies for allocating an inode. If the new inode is |
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* a directory, then a forward search is made for a block group with both |
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* free space and a low directory-to-inode ratio; if that fails, then of |
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* the groups with above-average free space, that group with the fewest |
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* directories already is chosen. |
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* |
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* For other inodes, search forward from the parent directory's block |
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* group to find a free inode. |
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*/ |
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struct inode *ufs_new_inode(struct inode *dir, umode_t mode) |
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{ |
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struct super_block * sb; |
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struct ufs_sb_info * sbi; |
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struct ufs_sb_private_info * uspi; |
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struct ufs_cg_private_info * ucpi; |
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struct ufs_cylinder_group * ucg; |
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struct inode * inode; |
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struct timespec64 ts; |
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unsigned cg, bit, i, j, start; |
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struct ufs_inode_info *ufsi; |
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int err = -ENOSPC; |
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UFSD("ENTER\n"); |
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/* Cannot create files in a deleted directory */ |
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if (!dir || !dir->i_nlink) |
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return ERR_PTR(-EPERM); |
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sb = dir->i_sb; |
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inode = new_inode(sb); |
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if (!inode) |
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return ERR_PTR(-ENOMEM); |
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ufsi = UFS_I(inode); |
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sbi = UFS_SB(sb); |
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uspi = sbi->s_uspi; |
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mutex_lock(&sbi->s_lock); |
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/* |
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* Try to place the inode in its parent directory |
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*/ |
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i = ufs_inotocg(dir->i_ino); |
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if (sbi->fs_cs(i).cs_nifree) { |
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cg = i; |
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goto cg_found; |
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} |
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/* |
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* Use a quadratic hash to find a group with a free inode |
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*/ |
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for ( j = 1; j < uspi->s_ncg; j <<= 1 ) { |
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i += j; |
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if (i >= uspi->s_ncg) |
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i -= uspi->s_ncg; |
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if (sbi->fs_cs(i).cs_nifree) { |
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cg = i; |
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goto cg_found; |
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} |
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} |
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/* |
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* That failed: try linear search for a free inode |
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*/ |
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i = ufs_inotocg(dir->i_ino) + 1; |
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for (j = 2; j < uspi->s_ncg; j++) { |
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i++; |
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if (i >= uspi->s_ncg) |
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i = 0; |
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if (sbi->fs_cs(i).cs_nifree) { |
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cg = i; |
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goto cg_found; |
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} |
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} |
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goto failed; |
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cg_found: |
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ucpi = ufs_load_cylinder (sb, cg); |
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if (!ucpi) { |
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err = -EIO; |
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goto failed; |
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} |
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ucg = ubh_get_ucg(UCPI_UBH(ucpi)); |
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if (!ufs_cg_chkmagic(sb, ucg)) |
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ufs_panic (sb, "ufs_new_inode", "internal error, bad cg magic number"); |
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start = ucpi->c_irotor; |
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bit = ubh_find_next_zero_bit (UCPI_UBH(ucpi), ucpi->c_iusedoff, uspi->s_ipg, start); |
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if (!(bit < uspi->s_ipg)) { |
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bit = ubh_find_first_zero_bit (UCPI_UBH(ucpi), ucpi->c_iusedoff, start); |
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if (!(bit < start)) { |
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ufs_error (sb, "ufs_new_inode", |
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"cylinder group %u corrupted - error in inode bitmap\n", cg); |
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err = -EIO; |
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goto failed; |
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} |
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} |
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UFSD("start = %u, bit = %u, ipg = %u\n", start, bit, uspi->s_ipg); |
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if (ubh_isclr (UCPI_UBH(ucpi), ucpi->c_iusedoff, bit)) |
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ubh_setbit (UCPI_UBH(ucpi), ucpi->c_iusedoff, bit); |
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else { |
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ufs_panic (sb, "ufs_new_inode", "internal error"); |
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err = -EIO; |
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goto failed; |
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} |
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if (uspi->fs_magic == UFS2_MAGIC) { |
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u32 initediblk = fs32_to_cpu(sb, ucg->cg_u.cg_u2.cg_initediblk); |
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if (bit + uspi->s_inopb > initediblk && |
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initediblk < fs32_to_cpu(sb, ucg->cg_u.cg_u2.cg_niblk)) |
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ufs2_init_inodes_chunk(sb, ucpi, ucg); |
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} |
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fs32_sub(sb, &ucg->cg_cs.cs_nifree, 1); |
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uspi->cs_total.cs_nifree--; |
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fs32_sub(sb, &sbi->fs_cs(cg).cs_nifree, 1); |
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if (S_ISDIR(mode)) { |
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fs32_add(sb, &ucg->cg_cs.cs_ndir, 1); |
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uspi->cs_total.cs_ndir++; |
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fs32_add(sb, &sbi->fs_cs(cg).cs_ndir, 1); |
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} |
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ubh_mark_buffer_dirty (USPI_UBH(uspi)); |
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ubh_mark_buffer_dirty (UCPI_UBH(ucpi)); |
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if (sb->s_flags & SB_SYNCHRONOUS) |
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ubh_sync_block(UCPI_UBH(ucpi)); |
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ufs_mark_sb_dirty(sb); |
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inode->i_ino = cg * uspi->s_ipg + bit; |
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inode_init_owner(&init_user_ns, inode, dir, mode); |
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inode->i_blocks = 0; |
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inode->i_generation = 0; |
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inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode); |
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ufsi->i_flags = UFS_I(dir)->i_flags; |
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ufsi->i_lastfrag = 0; |
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ufsi->i_shadow = 0; |
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ufsi->i_osync = 0; |
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ufsi->i_oeftflag = 0; |
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ufsi->i_dir_start_lookup = 0; |
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memset(&ufsi->i_u1, 0, sizeof(ufsi->i_u1)); |
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if (insert_inode_locked(inode) < 0) { |
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err = -EIO; |
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goto failed; |
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} |
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mark_inode_dirty(inode); |
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if (uspi->fs_magic == UFS2_MAGIC) { |
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struct buffer_head *bh; |
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struct ufs2_inode *ufs2_inode; |
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/* |
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* setup birth date, we do it here because of there is no sense |
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* to hold it in struct ufs_inode_info, and lose 64 bit |
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*/ |
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bh = sb_bread(sb, uspi->s_sbbase + ufs_inotofsba(inode->i_ino)); |
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if (!bh) { |
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ufs_warning(sb, "ufs_read_inode", |
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"unable to read inode %lu\n", |
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inode->i_ino); |
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err = -EIO; |
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goto fail_remove_inode; |
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} |
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lock_buffer(bh); |
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ufs2_inode = (struct ufs2_inode *)bh->b_data; |
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ufs2_inode += ufs_inotofsbo(inode->i_ino); |
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ktime_get_real_ts64(&ts); |
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ufs2_inode->ui_birthtime = cpu_to_fs64(sb, ts.tv_sec); |
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ufs2_inode->ui_birthnsec = cpu_to_fs32(sb, ts.tv_nsec); |
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mark_buffer_dirty(bh); |
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unlock_buffer(bh); |
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if (sb->s_flags & SB_SYNCHRONOUS) |
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sync_dirty_buffer(bh); |
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brelse(bh); |
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} |
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mutex_unlock(&sbi->s_lock); |
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UFSD("allocating inode %lu\n", inode->i_ino); |
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UFSD("EXIT\n"); |
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return inode; |
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fail_remove_inode: |
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mutex_unlock(&sbi->s_lock); |
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clear_nlink(inode); |
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discard_new_inode(inode); |
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UFSD("EXIT (FAILED): err %d\n", err); |
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return ERR_PTR(err); |
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failed: |
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mutex_unlock(&sbi->s_lock); |
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make_bad_inode(inode); |
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iput (inode); |
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UFSD("EXIT (FAILED): err %d\n", err); |
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return ERR_PTR(err); |
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}
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