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fs/affs/amigaffs.c
11.3 KB
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// SPDX-License-Identifier: GPL-2.0 |
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/* * linux/fs/affs/amigaffs.c * * (c) 1996 Hans-Joachim Widmaier - Rewritten * * (C) 1993 Ray Burr - Amiga FFS filesystem. * * Please send bug reports to: hjw@zvw.de */ |
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#include <linux/math64.h> |
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#include <linux/iversion.h> |
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#include "affs.h" |
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/* * Functions for accessing Amiga-FFS structures. */ /* Insert a header block bh into the directory dir * caller must hold AFFS_DIR->i_hash_lock! */ int affs_insert_hash(struct inode *dir, struct buffer_head *bh) { struct super_block *sb = dir->i_sb; struct buffer_head *dir_bh; u32 ino, hash_ino; int offset; ino = bh->b_blocknr; offset = affs_hash_name(sb, AFFS_TAIL(sb, bh)->name + 1, AFFS_TAIL(sb, bh)->name[0]); |
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pr_debug("%s(dir=%lu, ino=%d) ", __func__, dir->i_ino, ino); |
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dir_bh = affs_bread(sb, dir->i_ino); if (!dir_bh) return -EIO; hash_ino = be32_to_cpu(AFFS_HEAD(dir_bh)->table[offset]); while (hash_ino) { affs_brelse(dir_bh); dir_bh = affs_bread(sb, hash_ino); if (!dir_bh) return -EIO; hash_ino = be32_to_cpu(AFFS_TAIL(sb, dir_bh)->hash_chain); } AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino); AFFS_TAIL(sb, bh)->hash_chain = 0; affs_fix_checksum(sb, bh); if (dir->i_ino == dir_bh->b_blocknr) AFFS_HEAD(dir_bh)->table[offset] = cpu_to_be32(ino); else AFFS_TAIL(sb, dir_bh)->hash_chain = cpu_to_be32(ino); affs_adjust_checksum(dir_bh, ino); mark_buffer_dirty_inode(dir_bh, dir); affs_brelse(dir_bh); |
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dir->i_mtime = dir->i_ctime = current_time(dir); |
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inode_inc_iversion(dir); |
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mark_inode_dirty(dir); return 0; } /* Remove a header block from its directory. * caller must hold AFFS_DIR->i_hash_lock! */ int affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh) { struct super_block *sb; struct buffer_head *bh; u32 rem_ino, hash_ino; __be32 ino; int offset, retval; sb = dir->i_sb; rem_ino = rem_bh->b_blocknr; offset = affs_hash_name(sb, AFFS_TAIL(sb, rem_bh)->name+1, AFFS_TAIL(sb, rem_bh)->name[0]); |
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pr_debug("%s(dir=%lu, ino=%d, hashval=%d) ", __func__, dir->i_ino, rem_ino, offset); |
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bh = affs_bread(sb, dir->i_ino); if (!bh) return -EIO; retval = -ENOENT; hash_ino = be32_to_cpu(AFFS_HEAD(bh)->table[offset]); while (hash_ino) { if (hash_ino == rem_ino) { ino = AFFS_TAIL(sb, rem_bh)->hash_chain; if (dir->i_ino == bh->b_blocknr) AFFS_HEAD(bh)->table[offset] = ino; else AFFS_TAIL(sb, bh)->hash_chain = ino; affs_adjust_checksum(bh, be32_to_cpu(ino) - hash_ino); mark_buffer_dirty_inode(bh, dir); AFFS_TAIL(sb, rem_bh)->parent = 0; retval = 0; break; } affs_brelse(bh); bh = affs_bread(sb, hash_ino); if (!bh) return -EIO; hash_ino = be32_to_cpu(AFFS_TAIL(sb, bh)->hash_chain); } affs_brelse(bh); |
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dir->i_mtime = dir->i_ctime = current_time(dir); |
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inode_inc_iversion(dir); |
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mark_inode_dirty(dir); return retval; } static void |
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affs_fix_dcache(struct inode *inode, u32 entry_ino) |
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{ |
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struct dentry *dentry; |
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spin_lock(&inode->i_lock); |
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hlist_for_each_entry(dentry, &inode->i_dentry, d_u.d_alias) { |
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if (entry_ino == (u32)(long)dentry->d_fsdata) { |
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dentry->d_fsdata = (void *)inode->i_ino; |
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break; } |
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} |
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spin_unlock(&inode->i_lock); |
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} /* Remove header from link chain */ static int affs_remove_link(struct dentry *dentry) { |
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struct inode *dir, *inode = d_inode(dentry); |
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struct super_block *sb = inode->i_sb; |
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struct buffer_head *bh, *link_bh = NULL; |
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u32 link_ino, ino; int retval; |
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pr_debug("%s(key=%ld) ", __func__, inode->i_ino); |
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retval = -EIO; bh = affs_bread(sb, inode->i_ino); if (!bh) goto done; link_ino = (u32)(long)dentry->d_fsdata; if (inode->i_ino == link_ino) { /* we can't remove the head of the link, as its blocknr is still used as ino, * so we remove the block of the first link instead. */ link_ino = be32_to_cpu(AFFS_TAIL(sb, bh)->link_chain); link_bh = affs_bread(sb, link_ino); if (!link_bh) goto done; |
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dir = affs_iget(sb, be32_to_cpu(AFFS_TAIL(sb, link_bh)->parent)); if (IS_ERR(dir)) { retval = PTR_ERR(dir); |
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goto done; |
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} |
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affs_lock_dir(dir); |
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/* * if there's a dentry for that block, make it * refer to inode itself. */ affs_fix_dcache(inode, link_ino); |
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retval = affs_remove_hash(dir, link_bh); |
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if (retval) { affs_unlock_dir(dir); |
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goto done; |
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} |
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mark_buffer_dirty_inode(link_bh, inode); memcpy(AFFS_TAIL(sb, bh)->name, AFFS_TAIL(sb, link_bh)->name, 32); retval = affs_insert_hash(dir, bh); |
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if (retval) { affs_unlock_dir(dir); |
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goto done; |
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} |
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mark_buffer_dirty_inode(bh, inode); affs_unlock_dir(dir); iput(dir); } else { link_bh = affs_bread(sb, link_ino); if (!link_bh) goto done; } while ((ino = be32_to_cpu(AFFS_TAIL(sb, bh)->link_chain)) != 0) { if (ino == link_ino) { __be32 ino2 = AFFS_TAIL(sb, link_bh)->link_chain; AFFS_TAIL(sb, bh)->link_chain = ino2; affs_adjust_checksum(bh, be32_to_cpu(ino2) - link_ino); mark_buffer_dirty_inode(bh, inode); retval = 0; /* Fix the link count, if bh is a normal header block without links */ switch (be32_to_cpu(AFFS_TAIL(sb, bh)->stype)) { case ST_LINKDIR: case ST_LINKFILE: break; default: if (!AFFS_TAIL(sb, bh)->link_chain) |
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set_nlink(inode, 1); |
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} affs_free_block(sb, link_ino); goto done; } affs_brelse(bh); bh = affs_bread(sb, ino); if (!bh) goto done; } retval = -ENOENT; done: affs_brelse(link_bh); affs_brelse(bh); return retval; } static int affs_empty_dir(struct inode *inode) { struct super_block *sb = inode->i_sb; struct buffer_head *bh; int retval, size; retval = -EIO; bh = affs_bread(sb, inode->i_ino); if (!bh) goto done; retval = -ENOTEMPTY; for (size = AFFS_SB(sb)->s_hashsize - 1; size >= 0; size--) if (AFFS_HEAD(bh)->table[size]) goto not_empty; retval = 0; not_empty: affs_brelse(bh); done: return retval; } /* Remove a filesystem object. If the object to be removed has * links to it, one of the links must be changed to inherit * the file or directory. As above, any inode will do. * The buffer will not be freed. If the header is a link, the * block will be marked as free. * This function returns a negative error number in case of * an error, else 0 if the inode is to be deleted or 1 if not. */ int affs_remove_header(struct dentry *dentry) { struct super_block *sb; struct inode *inode, *dir; struct buffer_head *bh = NULL; int retval; |
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dir = d_inode(dentry->d_parent); |
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sb = dir->i_sb; retval = -ENOENT; |
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inode = d_inode(dentry); |
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if (!inode) goto done; |
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pr_debug("%s(key=%ld) ", __func__, inode->i_ino); |
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retval = -EIO; bh = affs_bread(sb, (u32)(long)dentry->d_fsdata); if (!bh) goto done; affs_lock_link(inode); affs_lock_dir(dir); switch (be32_to_cpu(AFFS_TAIL(sb, bh)->stype)) { case ST_USERDIR: /* if we ever want to support links to dirs * i_hash_lock of the inode must only be * taken after some checks */ affs_lock_dir(inode); retval = affs_empty_dir(inode); affs_unlock_dir(inode); if (retval) goto done_unlock; break; default: break; } retval = affs_remove_hash(dir, bh); if (retval) goto done_unlock; mark_buffer_dirty_inode(bh, inode); affs_unlock_dir(dir); if (inode->i_nlink > 1) retval = affs_remove_link(dentry); else |
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clear_nlink(inode); |
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affs_unlock_link(inode); |
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inode->i_ctime = current_time(inode); |
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mark_inode_dirty(inode); done: affs_brelse(bh); return retval; done_unlock: affs_unlock_dir(dir); affs_unlock_link(inode); goto done; } /* Checksum a block, do various consistency checks and optionally return the blocks type number. DATA points to the block. If their pointers are non-null, *PTYPE and *STYPE are set to the primary and secondary block types respectively, *HASHSIZE is set to the size of the hashtable (which lets us calculate the block size). Returns non-zero if the block is not consistent. */ u32 affs_checksum_block(struct super_block *sb, struct buffer_head *bh) { __be32 *ptr = (__be32 *)bh->b_data; u32 sum; int bsize; sum = 0; for (bsize = sb->s_blocksize / sizeof(__be32); bsize > 0; bsize--) sum += be32_to_cpu(*ptr++); return sum; } /* * Calculate the checksum of a disk block and store it * at the indicated position. */ void affs_fix_checksum(struct super_block *sb, struct buffer_head *bh) { int cnt = sb->s_blocksize / sizeof(__be32); __be32 *ptr = (__be32 *)bh->b_data; u32 checksum; __be32 *checksumptr; checksumptr = ptr + 5; *checksumptr = 0; for (checksum = 0; cnt > 0; ptr++, cnt--) checksum += be32_to_cpu(*ptr); *checksumptr = cpu_to_be32(-checksum); } void |
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affs_secs_to_datestamp(time64_t secs, struct affs_date *ds) |
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{ u32 days; u32 minute; |
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s32 rem; |
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secs -= sys_tz.tz_minuteswest * 60 + AFFS_EPOCH_DELTA; |
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if (secs < 0) secs = 0; |
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days = div_s64_rem(secs, 86400, &rem); minute = rem / 60; rem -= minute * 60; |
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ds->days = cpu_to_be32(days); ds->mins = cpu_to_be32(minute); |
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ds->ticks = cpu_to_be32(rem * 50); |
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} |
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umode_t |
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affs_prot_to_mode(u32 prot) |
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{ |
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umode_t mode = 0; |
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if (!(prot & FIBF_NOWRITE)) |
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mode |= 0200; |
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if (!(prot & FIBF_NOREAD)) |
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mode |= 0400; |
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if (!(prot & FIBF_NOEXECUTE)) |
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mode |= 0100; |
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if (prot & FIBF_GRP_WRITE) |
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mode |= 0020; |
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if (prot & FIBF_GRP_READ) |
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mode |= 0040; |
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if (prot & FIBF_GRP_EXECUTE) |
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mode |= 0010; |
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if (prot & FIBF_OTR_WRITE) |
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mode |= 0002; |
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if (prot & FIBF_OTR_READ) |
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mode |= 0004; |
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if (prot & FIBF_OTR_EXECUTE) |
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mode |= 0001; |
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return mode; } void |
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affs_mode_to_prot(struct inode *inode) |
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{ u32 prot = AFFS_I(inode)->i_protect; |
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umode_t mode = inode->i_mode; |
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if (!(mode & 0100)) |
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prot |= FIBF_NOEXECUTE; |
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if (!(mode & 0400)) |
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prot |= FIBF_NOREAD; |
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if (!(mode & 0200)) |
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prot |= FIBF_NOWRITE; |
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if (mode & 0010) |
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prot |= FIBF_GRP_EXECUTE; |
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if (mode & 0040) |
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prot |= FIBF_GRP_READ; |
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if (mode & 0020) |
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prot |= FIBF_GRP_WRITE; |
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if (mode & 0001) |
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prot |= FIBF_OTR_EXECUTE; |
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if (mode & 0004) |
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prot |= FIBF_OTR_READ; |
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if (mode & 0002) |
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prot |= FIBF_OTR_WRITE; AFFS_I(inode)->i_protect = prot; } void affs_error(struct super_block *sb, const char *function, const char *fmt, ...) { |
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struct va_format vaf; va_list args; |
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va_start(args, fmt); vaf.fmt = fmt; vaf.va = &args; pr_crit("error (device %s): %s(): %pV ", sb->s_id, function, &vaf); |
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if (!sb_rdonly(sb)) |
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pr_warn("Remounting filesystem read-only "); |
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sb->s_flags |= SB_RDONLY; |
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va_end(args); |
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} void affs_warning(struct super_block *sb, const char *function, const char *fmt, ...) { |
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struct va_format vaf; va_list args; |
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va_start(args, fmt); vaf.fmt = fmt; vaf.va = &args; pr_warn("(device %s): %s(): %pV ", sb->s_id, function, &vaf); |
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va_end(args); |
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} |
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bool affs_nofilenametruncate(const struct dentry *dentry) { |
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return affs_test_opt(AFFS_SB(dentry->d_sb)->s_flags, SF_NO_TRUNCATE); |
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} |
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/* Check if the name is valid for a affs object. */ int |
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affs_check_name(const unsigned char *name, int len, bool notruncate) |
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{ int i; |
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if (len > AFFSNAMEMAX) { |
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if (notruncate) return -ENAMETOOLONG; |
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len = AFFSNAMEMAX; |
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} |
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for (i = 0; i < len; i++) { if (name[i] < ' ' || name[i] == ':' || (name[i] > 0x7e && name[i] < 0xa0)) return -EINVAL; } return 0; } /* This function copies name to bstr, with at most 30 * characters length. The bstr will be prepended by * a length byte. * NOTE: The name will must be already checked by * affs_check_name()! */ int affs_copy_name(unsigned char *bstr, struct dentry *dentry) { |
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u32 len = min(dentry->d_name.len, AFFSNAMEMAX); |
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*bstr++ = len; memcpy(bstr, dentry->d_name.name, len); return len; } |