cregit-Linux how code gets into the kernel

Release 4.10 fs/adfs/super.c

Directory: fs/adfs
/*
 *  linux/fs/adfs/super.c
 *
 *  Copyright (C) 1997-1999 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/buffer_head.h>
#include <linux/parser.h>
#include <linux/mount.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/statfs.h>
#include <linux/user_namespace.h>
#include "adfs.h"
#include "dir_f.h"
#include "dir_fplus.h"


#define ADFS_DEFAULT_OWNER_MASK S_IRWXU

#define ADFS_DEFAULT_OTHER_MASK (S_IRWXG | S_IRWXO)


void __adfs_error(struct super_block *sb, const char *function, const char *fmt, ...) { char error_buf[128]; va_list args; va_start(args, fmt); vsnprintf(error_buf, sizeof(error_buf), fmt, args); va_end(args); printk(KERN_CRIT "ADFS-fs error (device %s)%s%s: %s\n", sb->s_id, function ? ": " : "", function ? function : "", error_buf); }

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pre-gitpre-git7491.36%250.00%
alexey dobriyanalexey dobriyan67.41%125.00%
linus torvaldslinus torvalds11.23%125.00%
Total81100.00%4100.00%


static int adfs_checkdiscrecord(struct adfs_discrecord *dr) { int i; /* sector size must be 256, 512 or 1024 bytes */ if (dr->log2secsize != 8 && dr->log2secsize != 9 && dr->log2secsize != 10) return 1; /* idlen must be at least log2secsize + 3 */ if (dr->idlen < dr->log2secsize + 3) return 1; /* we cannot have such a large disc that we * are unable to represent sector offsets in * 32 bits. This works out at 2.0 TB. */ if (le32_to_cpu(dr->disc_size_high) >> dr->log2secsize) return 1; /* idlen must be no greater than 19 v2 [1.0] */ if (dr->idlen > 19) return 1; /* reserved bytes should be zero */ for (i = 0; i < sizeof(dr->unused52); i++) if (dr->unused52[i] != 0) return 1; return 0; }

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pre-gitpre-git11697.48%150.00%
al viroal viro32.52%150.00%
Total119100.00%2100.00%


static unsigned char adfs_calczonecheck(struct super_block *sb, unsigned char *map) { unsigned int v0, v1, v2, v3; int i; v0 = v1 = v2 = v3 = 0; for (i = sb->s_blocksize - 4; i; i -= 4) { v0 += map[i] + (v3 >> 8); v3 &= 0xff; v1 += map[i + 1] + (v0 >> 8); v0 &= 0xff; v2 += map[i + 2] + (v1 >> 8); v1 &= 0xff; v3 += map[i + 3] + (v2 >> 8); v2 &= 0xff; } v0 += v3 >> 8; v1 += map[1] + (v0 >> 8); v2 += map[2] + (v1 >> 8); v3 += map[3] + (v2 >> 8); return v0 ^ v1 ^ v2 ^ v3; }

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static int adfs_checkmap(struct super_block *sb, struct adfs_discmap *dm) { unsigned char crosscheck = 0, zonecheck = 1; int i; for (i = 0; i < ADFS_SB(sb)->s_map_size; i++) { unsigned char *map; map = dm[i].dm_bh->b_data; if (adfs_calczonecheck(sb, map) != map[0]) { adfs_error(sb, "zone %d fails zonecheck", i); zonecheck = 0; } crosscheck ^= map[3]; } if (crosscheck != 0xff) adfs_error(sb, "crosscheck != 0xff"); return crosscheck == 0xff && zonecheck; }

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pre-gitpre-git11897.52%375.00%
dave jonesdave jones32.48%125.00%
Total121100.00%4100.00%


static void adfs_put_super(struct super_block *sb) { int i; struct adfs_sb_info *asb = ADFS_SB(sb); for (i = 0; i < asb->s_map_size; i++) brelse(asb->s_map[i].dm_bh); kfree(asb->s_map); kfree_rcu(asb, rcu); }

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pre-gitpre-git4163.08%250.00%
dave jonesdave jones2132.31%125.00%
al viroal viro34.62%125.00%
Total65100.00%4100.00%


static int adfs_show_options(struct seq_file *seq, struct dentry *root) { struct adfs_sb_info *asb = ADFS_SB(root->d_sb); if (!uid_eq(asb->s_uid, GLOBAL_ROOT_UID)) seq_printf(seq, ",uid=%u", from_kuid_munged(&init_user_ns, asb->s_uid)); if (!gid_eq(asb->s_gid, GLOBAL_ROOT_GID)) seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, asb->s_gid)); if (asb->s_owner_mask != ADFS_DEFAULT_OWNER_MASK) seq_printf(seq, ",ownmask=%o", asb->s_owner_mask); if (asb->s_other_mask != ADFS_DEFAULT_OTHER_MASK) seq_printf(seq, ",othmask=%o", asb->s_other_mask); if (asb->s_ftsuffix != 0) seq_printf(seq, ",ftsuffix=%u", asb->s_ftsuffix); return 0; }

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miklos szeredimiklos szeredi9967.81%125.00%
eric w. biedermaneric w. biederman2416.44%125.00%
stuart swalesstuart swales1913.01%125.00%
al viroal viro42.74%125.00%
Total146100.00%4100.00%

enum {Opt_uid, Opt_gid, Opt_ownmask, Opt_othmask, Opt_ftsuffix, Opt_err}; static const match_table_t tokens = { {Opt_uid, "uid=%u"}, {Opt_gid, "gid=%u"}, {Opt_ownmask, "ownmask=%o"}, {Opt_othmask, "othmask=%o"}, {Opt_ftsuffix, "ftsuffix=%u"}, {Opt_err, NULL} };
static int parse_options(struct super_block *sb, char *options) { char *p; struct adfs_sb_info *asb = ADFS_SB(sb); int option; if (!options) return 0; while ((p = strsep(&options, ",")) != NULL) { substring_t args[MAX_OPT_ARGS]; int token; if (!*p) continue; token = match_token(p, tokens, args); switch (token) { case Opt_uid: if (match_int(args, &option)) return -EINVAL; asb->s_uid = make_kuid(current_user_ns(), option); if (!uid_valid(asb->s_uid)) return -EINVAL; break; case Opt_gid: if (match_int(args, &option)) return -EINVAL; asb->s_gid = make_kgid(current_user_ns(), option); if (!gid_valid(asb->s_gid)) return -EINVAL; break; case Opt_ownmask: if (match_octal(args, &option)) return -EINVAL; asb->s_owner_mask = option; break; case Opt_othmask: if (match_octal(args, &option)) return -EINVAL; asb->s_other_mask = option; break; case Opt_ftsuffix: if (match_int(args, &option)) return -EINVAL; asb->s_ftsuffix = option; break; default: printk("ADFS-fs: unrecognised mount option \"%s\" " "or missing value\n", p); return -EINVAL; } } return 0; }

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pre-gitpre-git11241.95%116.67%
andrew mortonandrew morton6423.97%116.67%
eric w. biedermaneric w. biederman4014.98%116.67%
dave jonesdave jones2710.11%233.33%
stuart swalesstuart swales248.99%116.67%
Total267100.00%6100.00%


static int adfs_remount(struct super_block *sb, int *flags, char *data) { sync_filesystem(sb); *flags |= MS_NODIRATIME; return parse_options(sb, data); }

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pre-gitpre-git2772.97%133.33%
theodore tsotheodore tso513.51%133.33%
al viroal viro513.51%133.33%
Total37100.00%3100.00%


static int adfs_statfs(struct dentry *dentry, struct kstatfs *buf) { struct super_block *sb = dentry->d_sb; struct adfs_sb_info *sbi = ADFS_SB(sb); u64 id = huge_encode_dev(sb->s_bdev->bd_dev); buf->f_type = ADFS_SUPER_MAGIC; buf->f_namelen = sbi->s_namelen; buf->f_bsize = sb->s_blocksize; buf->f_blocks = sbi->s_size; buf->f_files = sbi->s_ids_per_zone * sbi->s_map_size; buf->f_bavail = buf->f_bfree = adfs_map_free(sb); buf->f_ffree = (long)(buf->f_bfree * buf->f_files) / (long)buf->f_blocks; buf->f_fsid.val[0] = (u32)id; buf->f_fsid.val[1] = (u32)(id >> 32); return 0; }

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pre-gitpre-git8653.42%342.86%
coly licoly li6037.27%114.29%
andrew mortonandrew morton95.59%114.29%
dave jonesdave jones31.86%114.29%
david howellsdavid howells31.86%114.29%
Total161100.00%7100.00%

static struct kmem_cache *adfs_inode_cachep;
static struct inode *adfs_alloc_inode(struct super_block *sb) { struct adfs_inode_info *ei; ei = kmem_cache_alloc(adfs_inode_cachep, GFP_KERNEL); if (!ei) return NULL; return &ei->vfs_inode; }

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linus torvaldslinus torvalds4097.56%150.00%
christoph lameterchristoph lameter12.44%150.00%
Total41100.00%2100.00%


static void adfs_i_callback(struct rcu_head *head) { struct inode *inode = container_of(head, struct inode, i_rcu); kmem_cache_free(adfs_inode_cachep, ADFS_I(inode)); }

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nick pigginnick piggin1850.00%150.00%
linus torvaldslinus torvalds1850.00%150.00%
Total36100.00%2100.00%


static void adfs_destroy_inode(struct inode *inode) { call_rcu(&inode->i_rcu, adfs_i_callback); }

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nick pigginnick piggin21100.00%1100.00%
Total21100.00%1100.00%


static void init_once(void *foo) { struct adfs_inode_info *ei = (struct adfs_inode_info *) foo; inode_init_once(&ei->vfs_inode); }

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linus torvaldslinus torvalds2790.00%150.00%
christoph lameterchristoph lameter310.00%150.00%
Total30100.00%2100.00%


static int __init init_inodecache(void) { adfs_inode_cachep = kmem_cache_create("adfs_inode_cache", sizeof(struct adfs_inode_info), 0, (SLAB_RECLAIM_ACCOUNT| SLAB_MEM_SPREAD|SLAB_ACCOUNT), init_once); if (adfs_inode_cachep == NULL) return -ENOMEM; return 0; }

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linus torvaldslinus torvalds3982.98%116.67%
paul jacksonpaul jackson48.51%233.33%
vladimir davydovvladimir davydov24.26%116.67%
andrew mortonandrew morton12.13%116.67%
fabian frederickfabian frederick12.13%116.67%
Total47100.00%6100.00%


static void destroy_inodecache(void) { /* * Make sure all delayed rcu free inodes are flushed before we * destroy cache. */ rcu_barrier(); kmem_cache_destroy(adfs_inode_cachep); }

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linus torvaldslinus torvalds1376.47%150.00%
kirill a. shutemovkirill a. shutemov423.53%150.00%
Total17100.00%2100.00%

static const struct super_operations adfs_sops = { .alloc_inode = adfs_alloc_inode, .destroy_inode = adfs_destroy_inode, .write_inode = adfs_write_inode, .put_super = adfs_put_super, .statfs = adfs_statfs, .remount_fs = adfs_remount, .show_options = adfs_show_options, };
static struct adfs_discmap *adfs_read_map(struct super_block *sb, struct adfs_discrecord *dr) { struct adfs_discmap *dm; unsigned int map_addr, zone_size, nzones; int i, zone; struct adfs_sb_info *asb = ADFS_SB(sb); nzones = asb->s_map_size; zone_size = (8 << dr->log2secsize) - le16_to_cpu(dr->zone_spare); map_addr = (nzones >> 1) * zone_size - ((nzones > 1) ? ADFS_DR_SIZE_BITS : 0); map_addr = signed_asl(map_addr, asb->s_map2blk); asb->s_ids_per_zone = zone_size / (asb->s_idlen + 1); dm = kmalloc(nzones * sizeof(*dm), GFP_KERNEL); if (dm == NULL) { adfs_error(sb, "not enough memory"); return ERR_PTR(-ENOMEM); } for (zone = 0; zone < nzones; zone++, map_addr++) { dm[zone].dm_startbit = 0; dm[zone].dm_endbit = zone_size; dm[zone].dm_startblk = zone * zone_size - ADFS_DR_SIZE_BITS; dm[zone].dm_bh = sb_bread(sb, map_addr); if (!dm[zone].dm_bh) { adfs_error(sb, "unable to read map"); goto error_free; } } /* adjust the limits for the first and last map zones */ i = zone - 1; dm[0].dm_startblk = 0; dm[0].dm_startbit = ADFS_DR_SIZE_BITS; dm[i].dm_endbit = (le32_to_cpu(dr->disc_size_high) << (32 - dr->log2bpmb)) + (le32_to_cpu(dr->disc_size) >> dr->log2bpmb) + (ADFS_DR_SIZE_BITS - i * zone_size); if (adfs_checkmap(sb, dm)) return dm; adfs_error(sb, "map corrupted"); error_free: while (--zone >= 0) brelse(dm[zone].dm_bh); kfree(dm); return ERR_PTR(-EIO); }

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pre-gitpre-git32791.34%342.86%
dave jonesdave jones143.91%114.29%
sanidhya kashyapsanidhya kashyap102.79%114.29%
al viroal viro61.68%114.29%
linus torvaldslinus torvalds10.28%114.29%
Total358100.00%7100.00%


static inline unsigned long adfs_discsize(struct adfs_discrecord *dr, int block_bits) { unsigned long discsize; discsize = le32_to_cpu(dr->disc_size_high) << (32 - block_bits); discsize |= le32_to_cpu(dr->disc_size) >> block_bits; return discsize; }

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pre-gitpre-git49100.00%2100.00%
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static int adfs_fill_super(struct super_block *sb, void *data, int silent) { struct adfs_discrecord *dr; struct buffer_head *bh; struct object_info root_obj; unsigned char *b_data; struct adfs_sb_info *asb; struct inode *root; int ret = -EINVAL; sb->s_flags |= MS_NODIRATIME; asb = kzalloc(sizeof(*asb), GFP_KERNEL); if (!asb) return -ENOMEM; sb->s_fs_info = asb; /* set default options */ asb->s_uid = GLOBAL_ROOT_UID; asb->s_gid = GLOBAL_ROOT_GID; asb->s_owner_mask = ADFS_DEFAULT_OWNER_MASK; asb->s_other_mask = ADFS_DEFAULT_OTHER_MASK; asb->s_ftsuffix = 0; if (parse_options(sb, data)) goto error; sb_set_blocksize(sb, BLOCK_SIZE); if (!(bh = sb_bread(sb, ADFS_DISCRECORD / BLOCK_SIZE))) { adfs_error(sb, "unable to read superblock"); ret = -EIO; goto error; } b_data = bh->b_data + (ADFS_DISCRECORD % BLOCK_SIZE); if (adfs_checkbblk(b_data)) { if (!silent) printk("VFS: Can't find an adfs filesystem on dev " "%s.\n", sb->s_id); ret = -EINVAL; goto error_free_bh; } dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET); /* * Do some sanity checks on the ADFS disc record */ if (adfs_checkdiscrecord(dr)) { if (!silent) printk("VPS: Can't find an adfs filesystem on dev " "%s.\n", sb->s_id); ret = -EINVAL; goto error_free_bh; } brelse(bh); if (sb_set_blocksize(sb, 1 << dr->log2secsize)) { bh = sb_bread(sb, ADFS_DISCRECORD / sb->s_blocksize); if (!bh) { adfs_error(sb, "couldn't read superblock on " "2nd try."); ret = -EIO; goto error; } b_data = bh->b_data + (ADFS_DISCRECORD % sb->s_blocksize); if (adfs_checkbblk(b_data)) { adfs_error(sb, "disc record mismatch, very weird!"); ret = -EINVAL; goto error_free_bh; } dr = (struct adfs_discrecord *)(b_data + ADFS_DR_OFFSET); } else { if (!silent) printk(KERN_ERR "VFS: Unsupported blocksize on dev " "%s.\n", sb->s_id); ret = -EINVAL; goto error; } /* * blocksize on this device should now be set to the ADFS log2secsize */ sb->s_magic = ADFS_SUPER_MAGIC; asb->s_idlen = dr->idlen; asb->s_map_size = dr->nzones | (dr->nzones_high << 8); asb->s_map2blk = dr->log2bpmb - dr->log2secsize; asb->s_size = adfs_discsize(dr, sb->s_blocksize_bits); asb->s_version = dr->format_version; asb->s_log2sharesize = dr->log2sharesize; asb->s_map = adfs_read_map(sb, dr); if (IS_ERR(asb->s_map)) { ret = PTR_ERR(asb->s_map); goto error_free_bh; } brelse(bh); /* * set up enough so that we can read an inode */ sb->s_op = &adfs_sops; dr = (struct adfs_discrecord *)(asb->s_map[0].dm_bh->b_data + 4); root_obj.parent_id = root_obj.file_id = le32_to_cpu(dr->root); root_obj.name_len = 0; /* Set root object date as 01 Jan 1987 00:00:00 */ root_obj.loadaddr = 0xfff0003f; root_obj.execaddr = 0xec22c000; root_obj.size = ADFS_NEWDIR_SIZE; root_obj.attr = ADFS_NDA_DIRECTORY | ADFS_NDA_OWNER_READ | ADFS_NDA_OWNER_WRITE | ADFS_NDA_PUBLIC_READ; root_obj.filetype = -1; /* * If this is a F+ disk with variable length directories, * get the root_size from the disc record. */ if (asb->s_version) { root_obj.size = le32_to_cpu(dr->root_size); asb->s_dir = &adfs_fplus_dir_ops; asb->s_namelen = ADFS_FPLUS_NAME_LEN; } else { asb->s_dir = &adfs_f_dir_ops; asb->s_namelen = ADFS_F_NAME_LEN; } /* * ,xyz hex filetype suffix may be added by driver * to files that have valid RISC OS filetype */ if (asb->s_ftsuffix) asb->s_namelen += 4; sb->s_d_op = &adfs_dentry_operations; root = adfs_iget(sb, &root_obj); sb->s_root = d_make_root(root); if (!sb->s_root) { int i; for (i = 0; i < asb->s_map_size; i++) brelse(asb->s_map[i].dm_bh); kfree(asb->s_map); adfs_error(sb, "get root inode failed\n"); ret = -EIO; goto error; } return 0; error_free_bh: brelse(bh); error: sb->s_fs_info = NULL; kfree(asb); return ret; }

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pre-gitpre-git55472.04%420.00%
dave jonesdave jones628.06%15.00%
sanidhya kashyapsanidhya kashyap567.28%15.00%
stuart swalesstuart swales293.77%15.00%
al viroal viro283.64%525.00%
linus torvaldslinus torvalds273.51%315.00%
andrew mortonandrew morton60.78%15.00%
miklos szeredimiklos szeredi20.26%15.00%
eric w. biedermaneric w. biederman20.26%15.00%
brian gerstbrian gerst20.26%15.00%
panagiotis issaris*panagiotis issaris*10.13%15.00%
Total769100.00%20100.00%


static struct dentry *adfs_mount(struct file_system_type *fs_type, int flags, const char *dev_name, void *data) { return mount_bdev(fs_type, flags, dev_name, data, adfs_fill_super); }

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al viroal viro3384.62%240.00%
pre-gitpre-git512.82%240.00%
andries brouwerandries brouwer12.56%120.00%
Total39100.00%5100.00%

static struct file_system_type adfs_fs_type = { .owner = THIS_MODULE, .name = "adfs", .mount = adfs_mount, .kill_sb = kill_block_super, .fs_flags = FS_REQUIRES_DEV, }; MODULE_ALIAS_FS("adfs");
static int __init init_adfs_fs(void) { int err = init_inodecache(); if (err) goto out1; err = register_filesystem(&adfs_fs_type); if (err) goto out; return 0; out: destroy_inodecache(); out1: return err; }

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linus torvaldslinus torvalds3570.00%125.00%
pre-gitpre-git1530.00%375.00%
Total50100.00%4100.00%


static void __exit exit_adfs_fs(void) { unregister_filesystem(&adfs_fs_type); destroy_inodecache(); }

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pre-gitpre-git1583.33%266.67%
linus torvaldslinus torvalds316.67%133.33%
Total18100.00%3100.00%

module_init(init_adfs_fs) module_exit(exit_adfs_fs) MODULE_LICENSE("GPL");

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pre-gitpre-git177061.89%916.07%
linus torvaldslinus torvalds2147.48%47.14%
andrew mortonandrew morton1324.62%47.14%
dave jonesdave jones1304.55%23.57%
miklos szeredimiklos szeredi1204.20%11.79%
al viroal viro1103.85%1119.64%
stuart swalesstuart swales802.80%11.79%
eric w. biedermaneric w. biederman742.59%23.57%
sanidhya kashyapsanidhya kashyap662.31%11.79%
coly licoly li602.10%11.79%
nick pigginnick piggin391.36%11.79%
russell kingrussell king220.77%11.79%
christoph lameterchristoph lameter60.21%35.36%
alexey dobriyanalexey dobriyan60.21%11.79%
theodore tsotheodore tso50.17%11.79%
paul jacksonpaul jackson40.14%23.57%
kirill a. shutemovkirill a. shutemov40.14%11.79%
david howellsdavid howells30.10%11.79%
christoph hellwigchristoph hellwig30.10%11.79%
tejun heotejun heo30.10%11.79%
brian gerstbrian gerst20.07%11.79%
vladimir davydovvladimir davydov20.07%11.79%
steven whitehousesteven whitehouse10.03%11.79%
fabian frederickfabian frederick10.03%11.79%
andries brouwerandries brouwer10.03%11.79%
josef 'jeff' sipekjosef 'jeff' sipek10.03%11.79%
panagiotis issaris*panagiotis issaris*10.03%11.79%
Total2860100.00%56100.00%
Directory: fs/adfs
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