diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 02:20:36 +0400 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 02:20:36 +0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/hfs/inode.c | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'fs/hfs/inode.c')
-rw-r--r-- | fs/hfs/inode.c | 636 |
1 files changed, 636 insertions, 0 deletions
diff --git a/fs/hfs/inode.c b/fs/hfs/inode.c new file mode 100644 index 000000000000..751912326094 --- /dev/null +++ b/fs/hfs/inode.c @@ -0,0 +1,636 @@ +/* + * linux/fs/hfs/inode.c + * + * Copyright (C) 1995-1997 Paul H. Hargrove + * (C) 2003 Ardis Technologies <roman@ardistech.com> + * This file may be distributed under the terms of the GNU General Public License. + * + * This file contains inode-related functions which do not depend on + * which scheme is being used to represent forks. + * + * Based on the minix file system code, (C) 1991, 1992 by Linus Torvalds + */ + +#include <linux/pagemap.h> +#include <linux/version.h> +#include <linux/mpage.h> + +#include "hfs_fs.h" +#include "btree.h" + +static struct file_operations hfs_file_operations; +static struct inode_operations hfs_file_inode_operations; + +/*================ Variable-like macros ================*/ + +#define HFS_VALID_MODE_BITS (S_IFREG | S_IFDIR | S_IRWXUGO) + +static int hfs_writepage(struct page *page, struct writeback_control *wbc) +{ + return block_write_full_page(page, hfs_get_block, wbc); +} + +static int hfs_readpage(struct file *file, struct page *page) +{ + return block_read_full_page(page, hfs_get_block); +} + +static int hfs_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to) +{ + return cont_prepare_write(page, from, to, hfs_get_block, + &HFS_I(page->mapping->host)->phys_size); +} + +static sector_t hfs_bmap(struct address_space *mapping, sector_t block) +{ + return generic_block_bmap(mapping, block, hfs_get_block); +} + +static int hfs_releasepage(struct page *page, int mask) +{ + struct inode *inode = page->mapping->host; + struct super_block *sb = inode->i_sb; + struct hfs_btree *tree; + struct hfs_bnode *node; + u32 nidx; + int i, res = 1; + + switch (inode->i_ino) { + case HFS_EXT_CNID: + tree = HFS_SB(sb)->ext_tree; + break; + case HFS_CAT_CNID: + tree = HFS_SB(sb)->cat_tree; + break; + default: + BUG(); + return 0; + } + if (tree->node_size >= PAGE_CACHE_SIZE) { + nidx = page->index >> (tree->node_size_shift - PAGE_CACHE_SHIFT); + spin_lock(&tree->hash_lock); + node = hfs_bnode_findhash(tree, nidx); + if (!node) + ; + else if (atomic_read(&node->refcnt)) + res = 0; + if (res && node) { + hfs_bnode_unhash(node); + hfs_bnode_free(node); + } + spin_unlock(&tree->hash_lock); + } else { + nidx = page->index << (PAGE_CACHE_SHIFT - tree->node_size_shift); + i = 1 << (PAGE_CACHE_SHIFT - tree->node_size_shift); + spin_lock(&tree->hash_lock); + do { + node = hfs_bnode_findhash(tree, nidx++); + if (!node) + continue; + if (atomic_read(&node->refcnt)) { + res = 0; + break; + } + hfs_bnode_unhash(node); + hfs_bnode_free(node); + } while (--i && nidx < tree->node_count); + spin_unlock(&tree->hash_lock); + } + //printk("releasepage: %lu,%x = %d\n", page->index, mask, res); + return res ? try_to_free_buffers(page) : 0; +} + +static int hfs_get_blocks(struct inode *inode, sector_t iblock, unsigned long max_blocks, + struct buffer_head *bh_result, int create) +{ + int ret; + + ret = hfs_get_block(inode, iblock, bh_result, create); + if (!ret) + bh_result->b_size = (1 << inode->i_blkbits); + return ret; +} + +static ssize_t hfs_direct_IO(int rw, struct kiocb *iocb, + const struct iovec *iov, loff_t offset, unsigned long nr_segs) +{ + struct file *file = iocb->ki_filp; + struct inode *inode = file->f_dentry->d_inode->i_mapping->host; + + return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, + offset, nr_segs, hfs_get_blocks, NULL); +} + +static int hfs_writepages(struct address_space *mapping, + struct writeback_control *wbc) +{ + return mpage_writepages(mapping, wbc, hfs_get_block); +} + +struct address_space_operations hfs_btree_aops = { + .readpage = hfs_readpage, + .writepage = hfs_writepage, + .sync_page = block_sync_page, + .prepare_write = hfs_prepare_write, + .commit_write = generic_commit_write, + .bmap = hfs_bmap, + .releasepage = hfs_releasepage, +}; + +struct address_space_operations hfs_aops = { + .readpage = hfs_readpage, + .writepage = hfs_writepage, + .sync_page = block_sync_page, + .prepare_write = hfs_prepare_write, + .commit_write = generic_commit_write, + .bmap = hfs_bmap, + .direct_IO = hfs_direct_IO, + .writepages = hfs_writepages, +}; + +/* + * hfs_new_inode + */ +struct inode *hfs_new_inode(struct inode *dir, struct qstr *name, int mode) +{ + struct super_block *sb = dir->i_sb; + struct inode *inode = new_inode(sb); + if (!inode) + return NULL; + + init_MUTEX(&HFS_I(inode)->extents_lock); + INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list); + hfs_cat_build_key((btree_key *)&HFS_I(inode)->cat_key, dir->i_ino, name); + inode->i_ino = HFS_SB(sb)->next_id++; + inode->i_mode = mode; + inode->i_uid = current->fsuid; + inode->i_gid = current->fsgid; + inode->i_nlink = 1; + inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; + inode->i_blksize = HFS_SB(sb)->alloc_blksz; + HFS_I(inode)->flags = 0; + HFS_I(inode)->rsrc_inode = NULL; + HFS_I(inode)->fs_blocks = 0; + if (S_ISDIR(mode)) { + inode->i_size = 2; + HFS_SB(sb)->folder_count++; + if (dir->i_ino == HFS_ROOT_CNID) + HFS_SB(sb)->root_dirs++; + inode->i_op = &hfs_dir_inode_operations; + inode->i_fop = &hfs_dir_operations; + inode->i_mode |= S_IRWXUGO; + inode->i_mode &= ~HFS_SB(inode->i_sb)->s_dir_umask; + } else if (S_ISREG(mode)) { + HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks; + HFS_SB(sb)->file_count++; + if (dir->i_ino == HFS_ROOT_CNID) + HFS_SB(sb)->root_files++; + inode->i_op = &hfs_file_inode_operations; + inode->i_fop = &hfs_file_operations; + inode->i_mapping->a_ops = &hfs_aops; + inode->i_mode |= S_IRUGO|S_IXUGO; + if (mode & S_IWUSR) + inode->i_mode |= S_IWUGO; + inode->i_mode &= ~HFS_SB(inode->i_sb)->s_file_umask; + HFS_I(inode)->phys_size = 0; + HFS_I(inode)->alloc_blocks = 0; + HFS_I(inode)->first_blocks = 0; + HFS_I(inode)->cached_start = 0; + HFS_I(inode)->cached_blocks = 0; + memset(HFS_I(inode)->first_extents, 0, sizeof(hfs_extent_rec)); + memset(HFS_I(inode)->cached_extents, 0, sizeof(hfs_extent_rec)); + } + insert_inode_hash(inode); + mark_inode_dirty(inode); + set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags); + sb->s_dirt = 1; + + return inode; +} + +void hfs_delete_inode(struct inode *inode) +{ + struct super_block *sb = inode->i_sb; + + dprint(DBG_INODE, "delete_inode: %lu\n", inode->i_ino); + if (S_ISDIR(inode->i_mode)) { + HFS_SB(sb)->folder_count--; + if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID)) + HFS_SB(sb)->root_dirs--; + set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags); + sb->s_dirt = 1; + return; + } + HFS_SB(sb)->file_count--; + if (HFS_I(inode)->cat_key.ParID == cpu_to_be32(HFS_ROOT_CNID)) + HFS_SB(sb)->root_files--; + if (S_ISREG(inode->i_mode)) { + if (!inode->i_nlink) { + inode->i_size = 0; + hfs_file_truncate(inode); + } + } + set_bit(HFS_FLG_MDB_DIRTY, &HFS_SB(sb)->flags); + sb->s_dirt = 1; +} + +void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext, + __be32 __log_size, __be32 phys_size, u32 clump_size) +{ + struct super_block *sb = inode->i_sb; + u32 log_size = be32_to_cpu(__log_size); + u16 count; + int i; + + memcpy(HFS_I(inode)->first_extents, ext, sizeof(hfs_extent_rec)); + for (count = 0, i = 0; i < 3; i++) + count += be16_to_cpu(ext[i].count); + HFS_I(inode)->first_blocks = count; + + inode->i_size = HFS_I(inode)->phys_size = log_size; + HFS_I(inode)->fs_blocks = (log_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits; + inode_set_bytes(inode, HFS_I(inode)->fs_blocks << sb->s_blocksize_bits); + HFS_I(inode)->alloc_blocks = be32_to_cpu(phys_size) / + HFS_SB(sb)->alloc_blksz; + HFS_I(inode)->clump_blocks = clump_size / HFS_SB(sb)->alloc_blksz; + if (!HFS_I(inode)->clump_blocks) + HFS_I(inode)->clump_blocks = HFS_SB(sb)->clumpablks; +} + +struct hfs_iget_data { + struct hfs_cat_key *key; + hfs_cat_rec *rec; +}; + +static int hfs_test_inode(struct inode *inode, void *data) +{ + struct hfs_iget_data *idata = data; + hfs_cat_rec *rec; + + rec = idata->rec; + switch (rec->type) { + case HFS_CDR_DIR: + return inode->i_ino == be32_to_cpu(rec->dir.DirID); + case HFS_CDR_FIL: + return inode->i_ino == be32_to_cpu(rec->file.FlNum); + default: + BUG(); + return 1; + } +} + +/* + * hfs_read_inode + */ +static int hfs_read_inode(struct inode *inode, void *data) +{ + struct hfs_iget_data *idata = data; + struct hfs_sb_info *hsb = HFS_SB(inode->i_sb); + hfs_cat_rec *rec; + + HFS_I(inode)->flags = 0; + HFS_I(inode)->rsrc_inode = NULL; + init_MUTEX(&HFS_I(inode)->extents_lock); + INIT_LIST_HEAD(&HFS_I(inode)->open_dir_list); + + /* Initialize the inode */ + inode->i_uid = hsb->s_uid; + inode->i_gid = hsb->s_gid; + inode->i_nlink = 1; + inode->i_blksize = HFS_SB(inode->i_sb)->alloc_blksz; + + if (idata->key) + HFS_I(inode)->cat_key = *idata->key; + else + HFS_I(inode)->flags |= HFS_FLG_RSRC; + HFS_I(inode)->tz_secondswest = sys_tz.tz_minuteswest * 60; + + rec = idata->rec; + switch (rec->type) { + case HFS_CDR_FIL: + if (!HFS_IS_RSRC(inode)) { + hfs_inode_read_fork(inode, rec->file.ExtRec, rec->file.LgLen, + rec->file.PyLen, be16_to_cpu(rec->file.ClpSize)); + } else { + hfs_inode_read_fork(inode, rec->file.RExtRec, rec->file.RLgLen, + rec->file.RPyLen, be16_to_cpu(rec->file.ClpSize)); + } + + inode->i_ino = be32_to_cpu(rec->file.FlNum); + inode->i_mode = S_IRUGO | S_IXUGO; + if (!(rec->file.Flags & HFS_FIL_LOCK)) + inode->i_mode |= S_IWUGO; + inode->i_mode &= ~hsb->s_file_umask; + inode->i_mode |= S_IFREG; + inode->i_ctime = inode->i_atime = inode->i_mtime = + hfs_m_to_utime(rec->file.MdDat); + inode->i_op = &hfs_file_inode_operations; + inode->i_fop = &hfs_file_operations; + inode->i_mapping->a_ops = &hfs_aops; + break; + case HFS_CDR_DIR: + inode->i_ino = be32_to_cpu(rec->dir.DirID); + inode->i_size = be16_to_cpu(rec->dir.Val) + 2; + HFS_I(inode)->fs_blocks = 0; + inode->i_mode = S_IFDIR | (S_IRWXUGO & ~hsb->s_dir_umask); + inode->i_ctime = inode->i_atime = inode->i_mtime = + hfs_m_to_utime(rec->dir.MdDat); + inode->i_op = &hfs_dir_inode_operations; + inode->i_fop = &hfs_dir_operations; + break; + default: + make_bad_inode(inode); + } + return 0; +} + +/* + * __hfs_iget() + * + * Given the MDB for a HFS filesystem, a 'key' and an 'entry' in + * the catalog B-tree and the 'type' of the desired file return the + * inode for that file/directory or NULL. Note that 'type' indicates + * whether we want the actual file or directory, or the corresponding + * metadata (AppleDouble header file or CAP metadata file). + */ +struct inode *hfs_iget(struct super_block *sb, struct hfs_cat_key *key, hfs_cat_rec *rec) +{ + struct hfs_iget_data data = { key, rec }; + struct inode *inode; + u32 cnid; + + switch (rec->type) { + case HFS_CDR_DIR: + cnid = be32_to_cpu(rec->dir.DirID); + break; + case HFS_CDR_FIL: + cnid = be32_to_cpu(rec->file.FlNum); + break; + default: + return NULL; + } + inode = iget5_locked(sb, cnid, hfs_test_inode, hfs_read_inode, &data); + if (inode && (inode->i_state & I_NEW)) + unlock_new_inode(inode); + return inode; +} + +void hfs_inode_write_fork(struct inode *inode, struct hfs_extent *ext, + __be32 *log_size, __be32 *phys_size) +{ + memcpy(ext, HFS_I(inode)->first_extents, sizeof(hfs_extent_rec)); + + if (log_size) + *log_size = cpu_to_be32(inode->i_size); + if (phys_size) + *phys_size = cpu_to_be32(HFS_I(inode)->alloc_blocks * + HFS_SB(inode->i_sb)->alloc_blksz); +} + +int hfs_write_inode(struct inode *inode, int unused) +{ + struct inode *main_inode = inode; + struct hfs_find_data fd; + hfs_cat_rec rec; + + dprint(DBG_INODE, "hfs_write_inode: %lu\n", inode->i_ino); + hfs_ext_write_extent(inode); + + if (inode->i_ino < HFS_FIRSTUSER_CNID) { + switch (inode->i_ino) { + case HFS_ROOT_CNID: + break; + case HFS_EXT_CNID: + hfs_btree_write(HFS_SB(inode->i_sb)->ext_tree); + return 0; + case HFS_CAT_CNID: + hfs_btree_write(HFS_SB(inode->i_sb)->cat_tree); + return 0; + default: + BUG(); + return -EIO; + } + } + + if (HFS_IS_RSRC(inode)) + main_inode = HFS_I(inode)->rsrc_inode; + + if (!main_inode->i_nlink) + return 0; + + if (hfs_find_init(HFS_SB(main_inode->i_sb)->cat_tree, &fd)) + /* panic? */ + return -EIO; + + fd.search_key->cat = HFS_I(main_inode)->cat_key; + if (hfs_brec_find(&fd)) + /* panic? */ + goto out; + + if (S_ISDIR(main_inode->i_mode)) { + if (fd.entrylength < sizeof(struct hfs_cat_dir)) + /* panic? */; + hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, + sizeof(struct hfs_cat_dir)); + if (rec.type != HFS_CDR_DIR || + be32_to_cpu(rec.dir.DirID) != inode->i_ino) { + } + + rec.dir.MdDat = hfs_u_to_mtime(inode->i_mtime); + rec.dir.Val = cpu_to_be16(inode->i_size - 2); + + hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, + sizeof(struct hfs_cat_dir)); + } else if (HFS_IS_RSRC(inode)) { + hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, + sizeof(struct hfs_cat_file)); + hfs_inode_write_fork(inode, rec.file.RExtRec, + &rec.file.RLgLen, &rec.file.RPyLen); + hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, + sizeof(struct hfs_cat_file)); + } else { + if (fd.entrylength < sizeof(struct hfs_cat_file)) + /* panic? */; + hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, + sizeof(struct hfs_cat_file)); + if (rec.type != HFS_CDR_FIL || + be32_to_cpu(rec.file.FlNum) != inode->i_ino) { + } + + if (inode->i_mode & S_IWUSR) + rec.file.Flags &= ~HFS_FIL_LOCK; + else + rec.file.Flags |= HFS_FIL_LOCK; + hfs_inode_write_fork(inode, rec.file.ExtRec, &rec.file.LgLen, &rec.file.PyLen); + rec.file.MdDat = hfs_u_to_mtime(inode->i_mtime); + + hfs_bnode_write(fd.bnode, &rec, fd.entryoffset, + sizeof(struct hfs_cat_file)); + } +out: + hfs_find_exit(&fd); + return 0; +} + +static struct dentry *hfs_file_lookup(struct inode *dir, struct dentry *dentry, + struct nameidata *nd) +{ + struct inode *inode = NULL; + hfs_cat_rec rec; + struct hfs_find_data fd; + int res; + + if (HFS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc")) + goto out; + + inode = HFS_I(dir)->rsrc_inode; + if (inode) + goto out; + + inode = new_inode(dir->i_sb); + if (!inode) + return ERR_PTR(-ENOMEM); + + hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd); + fd.search_key->cat = HFS_I(dir)->cat_key; + res = hfs_brec_read(&fd, &rec, sizeof(rec)); + if (!res) { + struct hfs_iget_data idata = { NULL, &rec }; + hfs_read_inode(inode, &idata); + } + hfs_find_exit(&fd); + if (res) { + iput(inode); + return ERR_PTR(res); + } + HFS_I(inode)->rsrc_inode = dir; + HFS_I(dir)->rsrc_inode = inode; + igrab(dir); + hlist_add_head(&inode->i_hash, &HFS_SB(dir->i_sb)->rsrc_inodes); + mark_inode_dirty(inode); +out: + d_add(dentry, inode); + return NULL; +} + +void hfs_clear_inode(struct inode *inode) +{ + if (HFS_IS_RSRC(inode) && HFS_I(inode)->rsrc_inode) { + HFS_I(HFS_I(inode)->rsrc_inode)->rsrc_inode = NULL; + iput(HFS_I(inode)->rsrc_inode); + } +} + +static int hfs_permission(struct inode *inode, int mask, + struct nameidata *nd) +{ + if (S_ISREG(inode->i_mode) && mask & MAY_EXEC) + return 0; + return generic_permission(inode, mask, NULL); +} + +static int hfs_file_open(struct inode *inode, struct file *file) +{ + if (HFS_IS_RSRC(inode)) + inode = HFS_I(inode)->rsrc_inode; + if (atomic_read(&file->f_count) != 1) + return 0; + atomic_inc(&HFS_I(inode)->opencnt); + return 0; +} + +static int hfs_file_release(struct inode *inode, struct file *file) +{ + //struct super_block *sb = inode->i_sb; + + if (HFS_IS_RSRC(inode)) + inode = HFS_I(inode)->rsrc_inode; + if (atomic_read(&file->f_count) != 0) + return 0; + if (atomic_dec_and_test(&HFS_I(inode)->opencnt)) { + down(&inode->i_sem); + hfs_file_truncate(inode); + //if (inode->i_flags & S_DEAD) { + // hfs_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL); + // hfs_delete_inode(inode); + //} + up(&inode->i_sem); + } + return 0; +} + +/* + * hfs_notify_change() + * + * Based very closely on fs/msdos/inode.c by Werner Almesberger + * + * This is the notify_change() field in the super_operations structure + * for HFS file systems. The purpose is to take that changes made to + * an inode and apply then in a filesystem-dependent manner. In this + * case the process has a few of tasks to do: + * 1) prevent changes to the i_uid and i_gid fields. + * 2) map file permissions to the closest allowable permissions + * 3) Since multiple Linux files can share the same on-disk inode under + * HFS (for instance the data and resource forks of a file) a change + * to permissions must be applied to all other in-core inodes which + * correspond to the same HFS file. + */ + +int hfs_inode_setattr(struct dentry *dentry, struct iattr * attr) +{ + struct inode *inode = dentry->d_inode; + struct hfs_sb_info *hsb = HFS_SB(inode->i_sb); + int error; + + error = inode_change_ok(inode, attr); /* basic permission checks */ + if (error) + return error; + + /* no uig/gid changes and limit which mode bits can be set */ + if (((attr->ia_valid & ATTR_UID) && + (attr->ia_uid != hsb->s_uid)) || + ((attr->ia_valid & ATTR_GID) && + (attr->ia_gid != hsb->s_gid)) || + ((attr->ia_valid & ATTR_MODE) && + ((S_ISDIR(inode->i_mode) && + (attr->ia_mode != inode->i_mode)) || + (attr->ia_mode & ~HFS_VALID_MODE_BITS)))) { + return hsb->s_quiet ? 0 : error; + } + + if (attr->ia_valid & ATTR_MODE) { + /* Only the 'w' bits can ever change and only all together. */ + if (attr->ia_mode & S_IWUSR) + attr->ia_mode = inode->i_mode | S_IWUGO; + else + attr->ia_mode = inode->i_mode & ~S_IWUGO; + attr->ia_mode &= S_ISDIR(inode->i_mode) ? ~hsb->s_dir_umask: ~hsb->s_file_umask; + } + error = inode_setattr(inode, attr); + if (error) + return error; + + return 0; +} + + +static struct file_operations hfs_file_operations = { + .llseek = generic_file_llseek, + .read = generic_file_read, + .write = generic_file_write, + .mmap = generic_file_mmap, + .sendfile = generic_file_sendfile, + .fsync = file_fsync, + .open = hfs_file_open, + .release = hfs_file_release, +}; + +static struct inode_operations hfs_file_inode_operations = { + .lookup = hfs_file_lookup, + .truncate = hfs_file_truncate, + .setattr = hfs_inode_setattr, + .permission = hfs_permission, + .setxattr = hfs_setxattr, + .getxattr = hfs_getxattr, + .listxattr = hfs_listxattr, +}; |