cregit-Linux how code gets into the kernel

Release 4.18 fs/hpfs/ea.c

Directory: fs/hpfs
// SPDX-License-Identifier: GPL-2.0
/*
 *  linux/fs/hpfs/ea.c
 *
 *  Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
 *
 *  handling extended attributes
 */

#include "hpfs_fn.h"

/* Remove external extended attributes. ano specifies whether a is a 
   direct sector where eas starts or an anode */


void hpfs_ea_ext_remove(struct super_block *s, secno a, int ano, unsigned len) { unsigned pos = 0; while (pos < len) { char ex[4 + 255 + 1 + 8]; struct extended_attribute *ea = (struct extended_attribute *)ex; if (pos + 4 > len) { hpfs_error(s, "EAs don't end correctly, %s %08x, len %08x", ano ? "anode" : "sectors", a, len); return; } if (hpfs_ea_read(s, a, ano, pos, 4, ex)) return; if (ea_indirect(ea)) { if (ea_valuelen(ea) != 8) { hpfs_error(s, "ea_indirect(ea) set while ea->valuelen!=8, %s %08x, pos %08x", ano ? "anode" : "sectors", a, pos); return; } if (hpfs_ea_read(s, a, ano, pos + 4, ea->namelen + 9, ex+4)) return; hpfs_ea_remove(s, ea_sec(ea), ea_in_anode(ea), ea_len(ea)); } pos += ea->namelen + ea_valuelen(ea) + 5; } if (!ano) hpfs_free_sectors(s, a, (len+511) >> 9); else { struct buffer_head *bh; struct anode *anode; if ((anode = hpfs_map_anode(s, a, &bh))) { hpfs_remove_btree(s, &anode->btree); brelse(bh); hpfs_free_sectors(s, a, 1); } } }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)26195.26%125.00%
Al Viro72.55%125.00%
Mikulas Patocka62.19%250.00%
Total274100.00%4100.00%


static char *get_indirect_ea(struct super_block *s, int ano, secno a, int size) { char *ret; if (!(ret = kmalloc(size + 1, GFP_NOFS))) { pr_err("out of memory for EA\n"); return NULL; } if (hpfs_ea_read(s, a, ano, 0, size, ret)) { kfree(ret); return NULL; } ret[size] = 0; return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)8596.59%125.00%
Fabian Frederick22.27%250.00%
Al Viro11.14%125.00%
Total88100.00%4100.00%


static void set_indirect_ea(struct super_block *s, int ano, secno a, const char *data, int size) { hpfs_ea_write(s, a, ano, 0, size, data); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)3997.50%150.00%
Al Viro12.50%150.00%
Total40100.00%2100.00%

/* Read an extended attribute named 'key' into the provided buffer */
int hpfs_read_ea(struct super_block *s, struct fnode *fnode, char *key, char *buf, int size) { unsigned pos; int ano, len; secno a; char ex[4 + 255 + 1 + 8]; struct extended_attribute *ea; struct extended_attribute *ea_end = fnode_end_ea(fnode); for (ea = fnode_ea(fnode); ea < ea_end; ea = next_ea(ea)) if (!strcmp(ea->name, key)) { if (ea_indirect(ea)) goto indirect; if (ea_valuelen(ea) >= size) return -EINVAL; memcpy(buf, ea_data(ea), ea_valuelen(ea)); buf[ea_valuelen(ea)] = 0; return 0; } a = le32_to_cpu(fnode->ea_secno); len = le32_to_cpu(fnode->ea_size_l); ano = fnode_in_anode(fnode); pos = 0; while (pos < len) { ea = (struct extended_attribute *)ex; if (pos + 4 > len) { hpfs_error(s, "EAs don't end correctly, %s %08x, len %08x", ano ? "anode" : "sectors", a, len); return -EIO; } if (hpfs_ea_read(s, a, ano, pos, 4, ex)) return -EIO; if (hpfs_ea_read(s, a, ano, pos + 4, ea->namelen + 1 + (ea_indirect(ea) ? 8 : 0), ex + 4)) return -EIO; if (!strcmp(ea->name, key)) { if (ea_indirect(ea)) goto indirect; if (ea_valuelen(ea) >= size) return -EINVAL; if (hpfs_ea_read(s, a, ano, pos + 4 + ea->namelen + 1, ea_valuelen(ea), buf)) return -EIO; buf[ea_valuelen(ea)] = 0; return 0; } pos += ea->namelen + ea_valuelen(ea) + 5; } return -ENOENT; indirect: if (ea_len(ea) >= size) return -EINVAL; if (hpfs_ea_read(s, ea_sec(ea), ea_in_anode(ea), 0, ea_len(ea), buf)) return -EIO; buf[ea_len(ea)] = 0; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)39087.84%116.67%
Mikulas Patocka398.78%350.00%
Al Viro153.38%233.33%
Total444100.00%6100.00%

/* Read an extended attribute named 'key' */
char *hpfs_get_ea(struct super_block *s, struct fnode *fnode, char *key, int *size) { char *ret; unsigned pos; int ano, len; secno a; struct extended_attribute *ea; struct extended_attribute *ea_end = fnode_end_ea(fnode); for (ea = fnode_ea(fnode); ea < ea_end; ea = next_ea(ea)) if (!strcmp(ea->name, key)) { if (ea_indirect(ea)) return get_indirect_ea(s, ea_in_anode(ea), ea_sec(ea), *size = ea_len(ea)); if (!(ret = kmalloc((*size = ea_valuelen(ea)) + 1, GFP_NOFS))) { pr_err("out of memory for EA\n"); return NULL; } memcpy(ret, ea_data(ea), ea_valuelen(ea)); ret[ea_valuelen(ea)] = 0; return ret; } a = le32_to_cpu(fnode->ea_secno); len = le32_to_cpu(fnode->ea_size_l); ano = fnode_in_anode(fnode); pos = 0; while (pos < len) { char ex[4 + 255 + 1 + 8]; ea = (struct extended_attribute *)ex; if (pos + 4 > len) { hpfs_error(s, "EAs don't end correctly, %s %08x, len %08x", ano ? "anode" : "sectors", a, len); return NULL; } if (hpfs_ea_read(s, a, ano, pos, 4, ex)) return NULL; if (hpfs_ea_read(s, a, ano, pos + 4, ea->namelen + 1 + (ea_indirect(ea) ? 8 : 0), ex + 4)) return NULL; if (!strcmp(ea->name, key)) { if (ea_indirect(ea)) return get_indirect_ea(s, ea_in_anode(ea), ea_sec(ea), *size = ea_len(ea)); if (!(ret = kmalloc((*size = ea_valuelen(ea)) + 1, GFP_NOFS))) { pr_err("out of memory for EA\n"); return NULL; } if (hpfs_ea_read(s, a, ano, pos + 4 + ea->namelen + 1, ea_valuelen(ea), ret)) { kfree(ret); return NULL; } ret[ea_valuelen(ea)] = 0; return ret; } pos += ea->namelen + ea_valuelen(ea) + 5; } return NULL; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)42389.24%112.50%
Mikulas Patocka275.70%225.00%
Al Viro204.22%337.50%
Fabian Frederick40.84%225.00%
Total474100.00%8100.00%

/* * Update or create extended attribute 'key' with value 'data'. Note that * when this ea exists, it MUST have the same size as size of data. * This driver can't change sizes of eas ('cause I just don't need it). */
void hpfs_set_ea(struct inode *inode, struct fnode *fnode, const char *key, const char *data, int size) { fnode_secno fno = inode->i_ino; struct super_block *s = inode->i_sb; unsigned pos; int ano, len; secno a; unsigned char h[4]; struct extended_attribute *ea; struct extended_attribute *ea_end = fnode_end_ea(fnode); for (ea = fnode_ea(fnode); ea < ea_end; ea = next_ea(ea)) if (!strcmp(ea->name, key)) { if (ea_indirect(ea)) { if (ea_len(ea) == size) set_indirect_ea(s, ea_in_anode(ea), ea_sec(ea), data, size); } else if (ea_valuelen(ea) == size) { memcpy(ea_data(ea), data, size); } return; } a = le32_to_cpu(fnode->ea_secno); len = le32_to_cpu(fnode->ea_size_l); ano = fnode_in_anode(fnode); pos = 0; while (pos < len) { char ex[4 + 255 + 1 + 8]; ea = (struct extended_attribute *)ex; if (pos + 4 > len) { hpfs_error(s, "EAs don't end correctly, %s %08x, len %08x", ano ? "anode" : "sectors", a, len); return; } if (hpfs_ea_read(s, a, ano, pos, 4, ex)) return; if (hpfs_ea_read(s, a, ano, pos + 4, ea->namelen + 1 + (ea_indirect(ea) ? 8 : 0), ex + 4)) return; if (!strcmp(ea->name, key)) { if (ea_indirect(ea)) { if (ea_len(ea) == size) set_indirect_ea(s, ea_in_anode(ea), ea_sec(ea), data, size); } else { if (ea_valuelen(ea) == size) hpfs_ea_write(s, a, ano, pos + 4 + ea->namelen + 1, size, data); } return; } pos += ea->namelen + ea_valuelen(ea) + 5; } if (!le16_to_cpu(fnode->ea_offs)) { /*if (le16_to_cpu(fnode->ea_size_s)) { hpfs_error(s, "fnode %08x: ea_size_s == %03x, ea_offs == 0", inode->i_ino, le16_to_cpu(fnode->ea_size_s)); return; }*/ fnode->ea_offs = cpu_to_le16(0xc4); } if (le16_to_cpu(fnode->ea_offs) < 0xc4 || le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s) + le16_to_cpu(fnode->ea_size_s) > 0x200) { hpfs_error(s, "fnode %08lx: ea_offs == %03x, ea_size_s == %03x", (unsigned long)inode->i_ino, le16_to_cpu(fnode->ea_offs), le16_to_cpu(fnode->ea_size_s)); return; } if ((le16_to_cpu(fnode->ea_size_s) || !le32_to_cpu(fnode->ea_size_l)) && le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s) + le16_to_cpu(fnode->ea_size_s) + strlen(key) + size + 5 <= 0x200) { ea = fnode_end_ea(fnode); *(char *)ea = 0; ea->namelen = strlen(key); ea->valuelen_lo = size; ea->valuelen_hi = size >> 8; strcpy(ea->name, key); memcpy(ea_data(ea), data, size); fnode->ea_size_s = cpu_to_le16(le16_to_cpu(fnode->ea_size_s) + strlen(key) + size + 5); goto ret; } /* Most the code here is 99.9993422% unused. I hope there are no bugs. But what .. HPFS.IFS has also bugs in ea management. */ if (le16_to_cpu(fnode->ea_size_s) && !le32_to_cpu(fnode->ea_size_l)) { secno n; struct buffer_head *bh; char *data; if (!(n = hpfs_alloc_sector(s, fno, 1, 0))) return; if (!(data = hpfs_get_sector(s, n, &bh))) { hpfs_free_sectors(s, n, 1); return; } memcpy(data, fnode_ea(fnode), le16_to_cpu(fnode->ea_size_s)); fnode->ea_size_l = cpu_to_le32(le16_to_cpu(fnode->ea_size_s)); fnode->ea_size_s = cpu_to_le16(0); fnode->ea_secno = cpu_to_le32(n); fnode->flags &= ~FNODE_anode; mark_buffer_dirty(bh); brelse(bh); } pos = le32_to_cpu(fnode->ea_size_l) + 5 + strlen(key) + size; len = (le32_to_cpu(fnode->ea_size_l) + 511) >> 9; if (pos >= 30000) goto bail; while (((pos + 511) >> 9) > len) { if (!len) { secno q = hpfs_alloc_sector(s, fno, 1, 0); if (!q) goto bail; fnode->ea_secno = cpu_to_le32(q); fnode->flags &= ~FNODE_anode; len++; } else if (!fnode_in_anode(fnode)) { if (hpfs_alloc_if_possible(s, le32_to_cpu(fnode->ea_secno) + len)) { len++; } else { /* Aargh... don't know how to create ea anodes :-( */ /*struct buffer_head *bh; struct anode *anode; anode_secno a_s; if (!(anode = hpfs_alloc_anode(s, fno, &a_s, &bh))) goto bail; anode->up = cpu_to_le32(fno); anode->btree.fnode_parent = 1; anode->btree.n_free_nodes--; anode->btree.n_used_nodes++; anode->btree.first_free = cpu_to_le16(le16_to_cpu(anode->btree.first_free) + 12); anode->u.external[0].disk_secno = cpu_to_le32(le32_to_cpu(fnode->ea_secno)); anode->u.external[0].file_secno = cpu_to_le32(0); anode->u.external[0].length = cpu_to_le32(len); mark_buffer_dirty(bh); brelse(bh); fnode->flags |= FNODE_anode; fnode->ea_secno = cpu_to_le32(a_s);*/ secno new_sec; int i; if (!(new_sec = hpfs_alloc_sector(s, fno, 1, 1 - ((pos + 511) >> 9)))) goto bail; for (i = 0; i < len; i++) { struct buffer_head *bh1, *bh2; void *b1, *b2; if (!(b1 = hpfs_map_sector(s, le32_to_cpu(fnode->ea_secno) + i, &bh1, len - i - 1))) { hpfs_free_sectors(s, new_sec, (pos + 511) >> 9); goto bail; } if (!(b2 = hpfs_get_sector(s, new_sec + i, &bh2))) { brelse(bh1); hpfs_free_sectors(s, new_sec, (pos + 511) >> 9); goto bail; } memcpy(b2, b1, 512); brelse(bh1); mark_buffer_dirty(bh2); brelse(bh2); } hpfs_free_sectors(s, le32_to_cpu(fnode->ea_secno), len); fnode->ea_secno = cpu_to_le32(new_sec); len = (pos + 511) >> 9; } } if (fnode_in_anode(fnode)) { if (hpfs_add_sector_to_btree(s, le32_to_cpu(fnode->ea_secno), 0, len) != -1) { len++; } else { goto bail; } } } h[0] = 0; h[1] = strlen(key); h[2] = size & 0xff; h[3] = size >> 8; if (hpfs_ea_write(s, le32_to_cpu(fnode->ea_secno), fnode_in_anode(fnode), le32_to_cpu(fnode->ea_size_l), 4, h)) goto bail; if (hpfs_ea_write(s, le32_to_cpu(fnode->ea_secno), fnode_in_anode(fnode), le32_to_cpu(fnode->ea_size_l) + 4, h[1] + 1, key)) goto bail; if (hpfs_ea_write(s, le32_to_cpu(fnode->ea_secno), fnode_in_anode(fnode), le32_to_cpu(fnode->ea_size_l) + 5 + h[1], size, data)) goto bail; fnode->ea_size_l = cpu_to_le32(pos); ret: hpfs_i(inode)->i_ea_size += 5 + strlen(key) + size; return; bail: if (le32_to_cpu(fnode->ea_secno)) if (fnode_in_anode(fnode)) hpfs_truncate_btree(s, le32_to_cpu(fnode->ea_secno), 1, (le32_to_cpu(fnode->ea_size_l) + 511) >> 9); else hpfs_free_sectors(s, le32_to_cpu(fnode->ea_secno) + ((le32_to_cpu(fnode->ea_size_l) + 511) >> 9), len - ((le32_to_cpu(fnode->ea_size_l) + 511) >> 9)); else fnode->ea_secno = fnode->ea_size_l = cpu_to_le32(0); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)122883.59%218.18%
Mikulas Patocka18412.53%327.27%
Al Viro483.27%436.36%
Randy Dunlap50.34%19.09%
Linus Torvalds40.27%19.09%
Total1469100.00%11100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)243386.95%316.67%
Mikulas Patocka2569.15%422.22%
Al Viro923.29%527.78%
Fabian Frederick60.21%211.11%
Randy Dunlap50.18%15.56%
Linus Torvalds40.14%15.56%
Rusty Russell10.04%15.56%
Greg Kroah-Hartman10.04%15.56%
Total2798100.00%18100.00%
Directory: fs/hpfs
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.