cregit-Linux how code gets into the kernel

Release 4.10 fs/hfs/super.c

Directory: fs/hfs
 *  linux/fs/hfs/super.c
 * Copyright (C) 1995-1997  Paul H. Hargrove
 * (C) 2003 Ardis Technologies <>
 * This file may be distributed under the terms of the GNU General Public License.
 * This file contains hfs_read_super(), some of the super_ops and
 * init_hfs_fs() and exit_hfs_fs().  The remaining super_ops are in
 * inode.c since they deal with inodes.
 * Based on the minix file system code, (C) 1991, 1992 by Linus Torvalds

#include <linux/module.h>
#include <linux/blkdev.h>
#include <linux/backing-dev.h>
#include <linux/mount.h>
#include <linux/init.h>
#include <linux/nls.h>
#include <linux/parser.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/vfs.h>

#include "hfs_fs.h"
#include "btree.h"

static struct kmem_cache *hfs_inode_cachep;


static int hfs_sync_fs(struct super_block *sb, int wait) { hfs_mdb_commit(sb); return 0; }


artem bityutskiyartem bityutskiy22100.00%1100.00%

/* * hfs_put_super() * * This is the put_super() entry in the super_operations structure for * HFS filesystems. The purpose is to release the resources * associated with the superblock sb. */
static void hfs_put_super(struct super_block *sb) { cancel_delayed_work_sync(&HFS_SB(sb)->mdb_work); hfs_mdb_close(sb); /* release the MDB's resources */ hfs_mdb_put(sb); }


artem bityutskiyartem bityutskiy1648.48%125.00%
andrew mortonandrew morton618.18%125.00%
linus torvaldslinus torvalds515.15%125.00%

static void flush_mdb(struct work_struct *work) { struct hfs_sb_info *sbi; struct super_block *sb; sbi = container_of(work, struct hfs_sb_info,; sb = sbi->sb; spin_lock(&sbi->work_lock); sbi->work_queued = 0; spin_unlock(&sbi->work_lock); hfs_mdb_commit(sb); }


artem bityutskiyartem bityutskiy5377.94%150.00%
christoph hellwigchristoph hellwig1522.06%150.00%

void hfs_mark_mdb_dirty(struct super_block *sb) { struct hfs_sb_info *sbi = HFS_SB(sb); unsigned long delay; if (sb->s_flags & MS_RDONLY) return; spin_lock(&sbi->work_lock); if (!sbi->work_queued) { delay = msecs_to_jiffies(dirty_writeback_interval * 10); queue_delayed_work(system_long_wq, &sbi->mdb_work, delay); sbi->work_queued = 1; } spin_unlock(&sbi->work_lock); }


artem bityutskiyartem bityutskiy6981.18%133.33%
linus torvaldslinus torvalds1112.94%133.33%
andrew mortonandrew morton55.88%133.33%

/* * hfs_statfs() * * This is the statfs() entry in the super_operations structure for * HFS filesystems. The purpose is to return various data about the * filesystem. * * changed f_files/f_ffree to reflect the fs_ablock/free_ablocks. */
static int hfs_statfs(struct dentry *dentry, struct kstatfs *buf) { struct super_block *sb = dentry->d_sb; u64 id = huge_encode_dev(sb->s_bdev->bd_dev); buf->f_type = HFS_SUPER_MAGIC; buf->f_bsize = sb->s_blocksize; buf->f_blocks = (u32)HFS_SB(sb)->fs_ablocks * HFS_SB(sb)->fs_div; buf->f_bfree = (u32)HFS_SB(sb)->free_ablocks * HFS_SB(sb)->fs_div; buf->f_bavail = buf->f_bfree; buf->f_files = HFS_SB(sb)->fs_ablocks; buf->f_ffree = HFS_SB(sb)->free_ablocks; buf->f_fsid.val[0] = (u32)id; buf->f_fsid.val[1] = (u32)(id >> 32); buf->f_namelen = HFS_NAMELEN; return 0; }


andrew mortonandrew morton8551.83%125.00%
coly licoly li4426.83%125.00%
linus torvaldslinus torvalds2414.63%125.00%
david howellsdavid howells116.71%125.00%

static int hfs_remount(struct super_block *sb, int *flags, char *data) { sync_filesystem(sb); *flags |= MS_NODIRATIME; if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) return 0; if (!(*flags & MS_RDONLY)) { if (!(HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_UNMNT))) { pr_warn("filesystem was not cleanly unmounted, running fsck.hfs is recommended. leaving read-only.\n"); sb->s_flags |= MS_RDONLY; *flags |= MS_RDONLY; } else if (HFS_SB(sb)->mdb->drAtrb & cpu_to_be16(HFS_SB_ATTRIB_SLOCK)) { pr_warn("filesystem is marked locked, leaving read-only.\n"); sb->s_flags |= MS_RDONLY; *flags |= MS_RDONLY; } } return 0; }


andrew mortonandrew morton6447.06%111.11%
al viroal viro1511.03%222.22%
theodore tsotheodore tso53.68%111.11%
joe perchesjoe perches42.94%111.11%
brian gerstbrian gerst10.74%111.11%
adrian bunkadrian bunk10.74%111.11%

static int hfs_show_options(struct seq_file *seq, struct dentry *root) { struct hfs_sb_info *sbi = HFS_SB(root->d_sb); if (sbi->s_creator != cpu_to_be32(0x3f3f3f3f)) seq_show_option_n(seq, "creator", (char *)&sbi->s_creator, 4); if (sbi->s_type != cpu_to_be32(0x3f3f3f3f)) seq_show_option_n(seq, "type", (char *)&sbi->s_type, 4); seq_printf(seq, ",uid=%u,gid=%u", from_kuid_munged(&init_user_ns, sbi->s_uid), from_kgid_munged(&init_user_ns, sbi->s_gid)); if (sbi->s_file_umask != 0133) seq_printf(seq, ",file_umask=%o", sbi->s_file_umask); if (sbi->s_dir_umask != 0022) seq_printf(seq, ",dir_umask=%o", sbi->s_dir_umask); if (sbi->part >= 0) seq_printf(seq, ",part=%u", sbi->part); if (sbi->session >= 0) seq_printf(seq, ",session=%u", sbi->session); if (sbi->nls_disk) seq_printf(seq, ",codepage=%s", sbi->nls_disk->charset); if (sbi->nls_io) seq_printf(seq, ",iocharset=%s", sbi->nls_io->charset); if (sbi->s_quiet) seq_printf(seq, ",quiet"); return 0; }


roman zippelroman zippel21990.12%240.00%
eric w. biedermaneric w. biederman124.94%120.00%
kees cookkees cook83.29%120.00%
al viroal viro41.65%120.00%

static struct inode *hfs_alloc_inode(struct super_block *sb) { struct hfs_inode_info *i; i = kmem_cache_alloc(hfs_inode_cachep, GFP_KERNEL); return i ? &i->vfs_inode : NULL; }


andrew mortonandrew morton3697.30%266.67%
christoph lameterchristoph lameter12.70%133.33%

static void hfs_i_callback(struct rcu_head *head) { struct inode *inode = container_of(head, struct inode, i_rcu); kmem_cache_free(hfs_inode_cachep, HFS_I(inode)); }


nick pigginnick piggin1850.00%133.33%
andrew mortonandrew morton1850.00%266.67%

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


nick pigginnick piggin21100.00%1100.00%

static const struct super_operations hfs_super_operations = { .alloc_inode = hfs_alloc_inode, .destroy_inode = hfs_destroy_inode, .write_inode = hfs_write_inode, .evict_inode = hfs_evict_inode, .put_super = hfs_put_super, .sync_fs = hfs_sync_fs, .statfs = hfs_statfs, .remount_fs = hfs_remount, .show_options = hfs_show_options, }; enum { opt_uid, opt_gid, opt_umask, opt_file_umask, opt_dir_umask, opt_part, opt_session, opt_type, opt_creator, opt_quiet, opt_codepage, opt_iocharset, opt_err }; static const match_table_t tokens = { { opt_uid, "uid=%u" }, { opt_gid, "gid=%u" }, { opt_umask, "umask=%o" }, { opt_file_umask, "file_umask=%o" }, { opt_dir_umask, "dir_umask=%o" }, { opt_part, "part=%u" }, { opt_session, "session=%u" }, { opt_type, "type=%s" }, { opt_creator, "creator=%s" }, { opt_quiet, "quiet" }, { opt_codepage, "codepage=%s" }, { opt_iocharset, "iocharset=%s" }, { opt_err, NULL } };
static inline int match_fourchar(substring_t *arg, u32 *result) { if (arg->to - arg->from != 4) return -EINVAL; memcpy(result, arg->from, 4); return 0; }


roman zippelroman zippel45100.00%1100.00%

/* * parse_options() * * adapted from linux/fs/msdos/inode.c written 1992,93 by Werner Almesberger * This function is called by hfs_read_super() to parse the mount options. */
static int parse_options(char *options, struct hfs_sb_info *hsb) { char *p; substring_t args[MAX_OPT_ARGS]; int tmp, token; /* initialize the sb with defaults */ hsb->s_uid = current_uid(); hsb->s_gid = current_gid(); hsb->s_file_umask = 0133; hsb->s_dir_umask = 0022; hsb->s_type = hsb->s_creator = cpu_to_be32(0x3f3f3f3f); /* == '????' */ hsb->s_quiet = 0; hsb->part = -1; hsb->session = -1; if (!options) return 1; while ((p = strsep(&options, ",")) != NULL) { if (!*p) continue; token = match_token(p, tokens, args); switch (token) { case opt_uid: if (match_int(&args[0], &tmp)) { pr_err("uid requires an argument\n"); return 0; } hsb->s_uid = make_kuid(current_user_ns(), (uid_t)tmp); if (!uid_valid(hsb->s_uid)) { pr_err("invalid uid %d\n", tmp); return 0; } break; case opt_gid: if (match_int(&args[0], &tmp)) { pr_err("gid requires an argument\n"); return 0; } hsb->s_gid = make_kgid(current_user_ns(), (gid_t)tmp); if (!gid_valid(hsb->s_gid)) { pr_err("invalid gid %d\n", tmp); return 0; } break; case opt_umask: if (match_octal(&args[0], &tmp)) { pr_err("umask requires a value\n"); return 0; } hsb->s_file_umask = (umode_t)tmp; hsb->s_dir_umask = (umode_t)tmp; break; case opt_file_umask: if (match_octal(&args[0], &tmp)) { pr_err("file_umask requires a value\n"); return 0; } hsb->s_file_umask = (umode_t)tmp; break; case opt_dir_umask: if (match_octal(&args[0], &tmp)) { pr_err("dir_umask requires a value\n"); return 0; } hsb->s_dir_umask = (umode_t)tmp; break; case opt_part: if (match_int(&args[0], &hsb->part)) { pr_err("part requires an argument\n"); return 0; } break; case opt_session: if (match_int(&args[0], &hsb->session)) { pr_err("session requires an argument\n"); return 0; } break; case opt_type: if (match_fourchar(&args[0], &hsb->s_type)) { pr_err("type requires a 4 character value\n"); return 0; } break; case opt_creator: if (match_fourchar(&args[0], &hsb->s_creator)) { pr_err("creator requires a 4 character value\n"); return 0; } break; case opt_quiet: hsb->s_quiet = 1; break; case opt_codepage: if (hsb->nls_disk) { pr_err("unable to change codepage\n"); return 0; } p = match_strdup(&args[0]); if (p) hsb->nls_disk = load_nls(p); if (!hsb->nls_disk) { pr_err("unable to load codepage \"%s\"\n", p); kfree(p); return 0; } kfree(p); break; case opt_iocharset: if (hsb->nls_io) { pr_err("unable to change iocharset\n"); return 0; } p = match_strdup(&args[0]); if (p) hsb->nls_io = load_nls(p); if (!hsb->nls_io) { pr_err("unable to load iocharset \"%s\"\n", p); kfree(p); return 0; } kfree(p); break; default: return 0; } } if (hsb->nls_disk && !hsb->nls_io) { hsb->nls_io = load_nls_default(); if (!hsb->nls_io) { pr_err("unable to load default iocharset\n"); return 0; } } hsb->s_dir_umask &= 0777; hsb->s_file_umask &= 0577; return 1; }


roman zippelroman zippel35849.52%321.43%
andrew mortonandrew morton13418.53%321.43%
eric w. biedermaneric w. biederman527.19%17.14%
joe perchesjoe perches324.43%17.14%
jim meyeringjim meyering81.11%17.14%
david howellsdavid howells40.55%17.14%
al viroal viro40.55%17.14%
dave jonesdave jones10.14%17.14%

/* * hfs_read_super() * * This is the function that is responsible for mounting an HFS * filesystem. It performs all the tasks necessary to get enough data * from the disk to read the root inode. This includes parsing the * mount options, dealing with Macintosh partitions, reading the * superblock and the allocation bitmap blocks, calling * hfs_btree_init() to get the necessary data about the extents and * catalog B-trees and, finally, reading the root inode into memory. */
static int hfs_fill_super(struct super_block *sb, void *data, int silent) { struct hfs_sb_info *sbi; struct hfs_find_data fd; hfs_cat_rec rec; struct inode *root_inode; int res; sbi = kzalloc(sizeof(struct hfs_sb_info), GFP_KERNEL); if (!sbi) return -ENOMEM; sbi->sb = sb; sb->s_fs_info = sbi; spin_lock_init(&sbi->work_lock); INIT_DELAYED_WORK(&sbi->mdb_work, flush_mdb); res = -EINVAL; if (!parse_options((char *)data, sbi)) { pr_err("unable to parse mount options\n"); goto bail; } sb->s_op = &hfs_super_operations; sb->s_xattr = hfs_xattr_handlers; sb->s_flags |= MS_NODIRATIME; mutex_init(&sbi->bitmap_lock); res = hfs_mdb_get(sb); if (res) { if (!silent) pr_warn("can't find a HFS filesystem on dev %s\n", hfs_mdb_name(sb)); res = -EINVAL; goto bail; } /* try to get the root inode */ res = hfs_find_init(HFS_SB(sb)->cat_tree, &fd); if (res) goto bail_no_root; res = hfs_cat_find_brec(sb, HFS_ROOT_CNID, &fd); if (!res) { if (fd.entrylength > sizeof(rec) || fd.entrylength < 0) { res = -EIO; goto bail; } hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, fd.entrylength); } if (res) { hfs_find_exit(&fd); goto bail_no_root; } res = -EINVAL; root_inode = hfs_iget(sb, &fd.search_key->cat, &rec); hfs_find_exit(&fd); if (!root_inode) goto bail_no_root; sb->s_d_op = &hfs_dentry_operations; res = -ENOMEM; sb->s_root = d_make_root(root_inode); if (!sb->s_root) goto bail_no_root; /* everything's okay */ return 0; bail_no_root: pr_err("get root inode failed\n"); bail: hfs_mdb_put(sb); return res; }


andrew mortonandrew morton10929.30%315.00%
brian gerstbrian gerst328.60%210.00%
americo wangamerico wang297.80%15.00%
artem bityutskiyartem bityutskiy246.45%210.00%
al viroal viro123.23%315.00%
eric sandeeneric sandeen102.69%15.00%
alexey khoroshilovalexey khoroshilov92.42%15.00%
joe perchesjoe perches61.61%15.00%
andreas gruenbacherandreas gruenbacher61.61%15.00%
colin leroycolin leroy41.08%15.00%
matthias kaehlckematthias kaehlcke10.27%15.00%
panagiotis issaris*panagiotis issaris*10.27%15.00%

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


andrew mortonandrew morton3282.05%133.33%
al viroal viro512.82%133.33%

static struct file_system_type hfs_fs_type = { .owner = THIS_MODULE, .name = "hfs", .mount = hfs_mount, .kill_sb = kill_block_super, .fs_flags = FS_REQUIRES_DEV, }; MODULE_ALIAS_FS("hfs");
static void hfs_init_once(void *p) { struct hfs_inode_info *i = p; inode_init_once(&i->vfs_inode); }


andrew mortonandrew morton2288.00%150.00%
christoph lameterchristoph lameter312.00%150.00%

static int __init init_hfs_fs(void) { int err; hfs_inode_cachep = kmem_cache_create("hfs_inode_cache", sizeof(struct hfs_inode_info), 0, SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, hfs_init_once); if (!hfs_inode_cachep) return -ENOMEM; err = register_filesystem(&hfs_fs_type); if (err) kmem_cache_destroy(hfs_inode_cachep); return err; }


andrew mortonandrew morton3048.39%116.67%
linus torvaldslinus torvalds1625.81%116.67%
vladimir davydovvladimir davydov23.23%116.67%

static void __exit exit_hfs_fs(void) { unregister_filesystem(&hfs_fs_type); /* * Make sure all delayed rcu free inodes are flushed before we * destroy cache. */ rcu_barrier(); kmem_cache_destroy(hfs_inode_cachep); }


andrew mortonandrew morton520.83%120.00%
kirill a. shutemovkirill a. shutemov416.67%120.00%
linus torvaldslinus torvalds14.17%120.00%

module_init(init_hfs_fs) module_exit(exit_hfs_fs)

Overall Contributors

roman zippelroman zippel75231.35%46.56%
andrew mortonandrew morton62926.22%58.20%
artem bityutskiyartem bityutskiy1857.71%23.28%
eric w. biedermaneric w. biederman692.88%23.28%
linus torvaldslinus torvalds592.46%23.28%
al viroal viro441.83%813.11%
coly licoly li441.83%11.64%
joe perchesjoe perches421.75%11.64%
nick pigginnick piggin391.63%11.64%
brian gerstbrian gerst331.38%23.28%
americo wangamerico wang291.21%11.64%
christoph hellwigchristoph hellwig220.92%23.28%
david howellsdavid howells150.63%23.28%
eric sandeeneric sandeen100.42%11.64%
alexey khoroshilovalexey khoroshilov90.38%11.64%
jim meyeringjim meyering80.33%11.64%
kees cookkees cook80.33%11.64%
dave jonesdave jones60.25%23.28%
christoph lameterchristoph lameter60.25%34.92%
andreas gruenbacherandreas gruenbacher60.25%11.64%
tejun heotejun heo60.25%23.28%
theodore tsotheodore tso50.21%11.64%
colin leroycolin leroy40.17%11.64%
kirill a. shutemovkirill a. shutemov40.17%11.64%
vladimir davydovvladimir davydov20.08%11.64%
steven whitehousesteven whitehouse10.04%11.64%
adrian bunkadrian bunk10.04%11.64%
panagiotis issaris*panagiotis issaris*10.04%11.64%
robert p. j. dayrobert p. j. day10.04%11.64%
matthias kaehlckematthias kaehlcke10.04%11.64%
josef 'jeff' sipekjosef 'jeff' sipek10.04%11.64%
Directory: fs/hfs
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