diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/hfsplus/inode.c |
Linux-2.6.12-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/hfsplus/inode.c')
-rw-r--r-- | fs/hfsplus/inode.c | 555 |
1 files changed, 555 insertions, 0 deletions
diff --git a/fs/hfsplus/inode.c b/fs/hfsplus/inode.c new file mode 100644 index 000000000000..d5642705f633 --- /dev/null +++ b/fs/hfsplus/inode.c @@ -0,0 +1,555 @@ +/* + * linux/fs/hfsplus/inode.c + * + * Copyright (C) 2001 + * Brad Boyer (flar@allandria.com) + * (C) 2003 Ardis Technologies <roman@ardistech.com> + * + * Inode handling routines + */ + +#include <linux/mm.h> +#include <linux/fs.h> +#include <linux/pagemap.h> +#include <linux/version.h> +#include <linux/mpage.h> + +#include "hfsplus_fs.h" +#include "hfsplus_raw.h" + +static int hfsplus_readpage(struct file *file, struct page *page) +{ + //printk("readpage: %lu\n", page->index); + return block_read_full_page(page, hfsplus_get_block); +} + +static int hfsplus_writepage(struct page *page, struct writeback_control *wbc) +{ + //printk("writepage: %lu\n", page->index); + return block_write_full_page(page, hfsplus_get_block, wbc); +} + +static int hfsplus_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to) +{ + return cont_prepare_write(page, from, to, hfsplus_get_block, + &HFSPLUS_I(page->mapping->host).phys_size); +} + +static sector_t hfsplus_bmap(struct address_space *mapping, sector_t block) +{ + return generic_block_bmap(mapping, block, hfsplus_get_block); +} + +static int hfsplus_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 HFSPLUS_EXT_CNID: + tree = HFSPLUS_SB(sb).ext_tree; + break; + case HFSPLUS_CAT_CNID: + tree = HFSPLUS_SB(sb).cat_tree; + break; + case HFSPLUS_ATTR_CNID: + tree = HFSPLUS_SB(sb).attr_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 hfsplus_get_blocks(struct inode *inode, sector_t iblock, unsigned long max_blocks, + struct buffer_head *bh_result, int create) +{ + int ret; + + ret = hfsplus_get_block(inode, iblock, bh_result, create); + if (!ret) + bh_result->b_size = (1 << inode->i_blkbits); + return ret; +} + +static ssize_t hfsplus_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, hfsplus_get_blocks, NULL); +} + +static int hfsplus_writepages(struct address_space *mapping, + struct writeback_control *wbc) +{ + return mpage_writepages(mapping, wbc, hfsplus_get_block); +} + +struct address_space_operations hfsplus_btree_aops = { + .readpage = hfsplus_readpage, + .writepage = hfsplus_writepage, + .sync_page = block_sync_page, + .prepare_write = hfsplus_prepare_write, + .commit_write = generic_commit_write, + .bmap = hfsplus_bmap, + .releasepage = hfsplus_releasepage, +}; + +struct address_space_operations hfsplus_aops = { + .readpage = hfsplus_readpage, + .writepage = hfsplus_writepage, + .sync_page = block_sync_page, + .prepare_write = hfsplus_prepare_write, + .commit_write = generic_commit_write, + .bmap = hfsplus_bmap, + .direct_IO = hfsplus_direct_IO, + .writepages = hfsplus_writepages, +}; + +static struct dentry *hfsplus_file_lookup(struct inode *dir, struct dentry *dentry, + struct nameidata *nd) +{ + struct hfs_find_data fd; + struct super_block *sb = dir->i_sb; + struct inode *inode = NULL; + int err; + + if (HFSPLUS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc")) + goto out; + + inode = HFSPLUS_I(dir).rsrc_inode; + if (inode) + goto out; + + inode = new_inode(sb); + if (!inode) + return ERR_PTR(-ENOMEM); + + inode->i_ino = dir->i_ino; + INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list); + init_MUTEX(&HFSPLUS_I(inode).extents_lock); + HFSPLUS_I(inode).flags = HFSPLUS_FLG_RSRC; + + hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd); + err = hfsplus_find_cat(sb, dir->i_ino, &fd); + if (!err) + err = hfsplus_cat_read_inode(inode, &fd); + hfs_find_exit(&fd); + if (err) { + iput(inode); + return ERR_PTR(err); + } + HFSPLUS_I(inode).rsrc_inode = dir; + HFSPLUS_I(dir).rsrc_inode = inode; + igrab(dir); + hlist_add_head(&inode->i_hash, &HFSPLUS_SB(sb).rsrc_inodes); + mark_inode_dirty(inode); + { + void hfsplus_inode_check(struct super_block *sb); + atomic_inc(&HFSPLUS_SB(sb).inode_cnt); + hfsplus_inode_check(sb); + } +out: + d_add(dentry, inode); + return NULL; +} + +static void hfsplus_get_perms(struct inode *inode, struct hfsplus_perm *perms, int dir) +{ + struct super_block *sb = inode->i_sb; + u16 mode; + + mode = be16_to_cpu(perms->mode); + + inode->i_uid = be32_to_cpu(perms->owner); + if (!inode->i_uid && !mode) + inode->i_uid = HFSPLUS_SB(sb).uid; + + inode->i_gid = be32_to_cpu(perms->group); + if (!inode->i_gid && !mode) + inode->i_gid = HFSPLUS_SB(sb).gid; + + if (dir) { + mode = mode ? (mode & S_IALLUGO) : + (S_IRWXUGO & ~(HFSPLUS_SB(sb).umask)); + mode |= S_IFDIR; + } else if (!mode) + mode = S_IFREG | ((S_IRUGO|S_IWUGO) & + ~(HFSPLUS_SB(sb).umask)); + inode->i_mode = mode; + + HFSPLUS_I(inode).rootflags = perms->rootflags; + HFSPLUS_I(inode).userflags = perms->userflags; + if (perms->rootflags & HFSPLUS_FLG_IMMUTABLE) + inode->i_flags |= S_IMMUTABLE; + else + inode->i_flags &= ~S_IMMUTABLE; + if (perms->rootflags & HFSPLUS_FLG_APPEND) + inode->i_flags |= S_APPEND; + else + inode->i_flags &= ~S_APPEND; +} + +static void hfsplus_set_perms(struct inode *inode, struct hfsplus_perm *perms) +{ + if (inode->i_flags & S_IMMUTABLE) + perms->rootflags |= HFSPLUS_FLG_IMMUTABLE; + else + perms->rootflags &= ~HFSPLUS_FLG_IMMUTABLE; + if (inode->i_flags & S_APPEND) + perms->rootflags |= HFSPLUS_FLG_APPEND; + else + perms->rootflags &= ~HFSPLUS_FLG_APPEND; + perms->userflags = HFSPLUS_I(inode).userflags; + perms->mode = cpu_to_be16(inode->i_mode); + perms->owner = cpu_to_be32(inode->i_uid); + perms->group = cpu_to_be32(inode->i_gid); + perms->dev = cpu_to_be32(HFSPLUS_I(inode).dev); +} + +static int hfsplus_permission(struct inode *inode, int mask, struct nameidata *nd) +{ + /* MAY_EXEC is also used for lookup, if no x bit is set allow lookup, + * open_exec has the same test, so it's still not executable, if a x bit + * is set fall back to standard permission check. + */ + if (S_ISREG(inode->i_mode) && mask & MAY_EXEC && !(inode->i_mode & 0111)) + return 0; + return generic_permission(inode, mask, NULL); +} + + +static int hfsplus_file_open(struct inode *inode, struct file *file) +{ + if (HFSPLUS_IS_RSRC(inode)) + inode = HFSPLUS_I(inode).rsrc_inode; + if (atomic_read(&file->f_count) != 1) + return 0; + atomic_inc(&HFSPLUS_I(inode).opencnt); + return 0; +} + +static int hfsplus_file_release(struct inode *inode, struct file *file) +{ + struct super_block *sb = inode->i_sb; + + if (HFSPLUS_IS_RSRC(inode)) + inode = HFSPLUS_I(inode).rsrc_inode; + if (atomic_read(&file->f_count) != 0) + return 0; + if (atomic_dec_and_test(&HFSPLUS_I(inode).opencnt)) { + down(&inode->i_sem); + hfsplus_file_truncate(inode); + if (inode->i_flags & S_DEAD) { + hfsplus_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL); + hfsplus_delete_inode(inode); + } + up(&inode->i_sem); + } + return 0; +} + +extern struct inode_operations hfsplus_dir_inode_operations; +extern struct file_operations hfsplus_dir_operations; + +static struct inode_operations hfsplus_file_inode_operations = { + .lookup = hfsplus_file_lookup, + .truncate = hfsplus_file_truncate, + .permission = hfsplus_permission, + .setxattr = hfsplus_setxattr, + .getxattr = hfsplus_getxattr, + .listxattr = hfsplus_listxattr, +}; + +static struct file_operations hfsplus_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 = hfsplus_file_open, + .release = hfsplus_file_release, + .ioctl = hfsplus_ioctl, +}; + +struct inode *hfsplus_new_inode(struct super_block *sb, int mode) +{ + struct inode *inode = new_inode(sb); + if (!inode) + return NULL; + + { + void hfsplus_inode_check(struct super_block *sb); + atomic_inc(&HFSPLUS_SB(sb).inode_cnt); + hfsplus_inode_check(sb); + } + inode->i_ino = HFSPLUS_SB(sb).next_cnid++; + 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 = HFSPLUS_SB(sb).alloc_blksz; + INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list); + init_MUTEX(&HFSPLUS_I(inode).extents_lock); + atomic_set(&HFSPLUS_I(inode).opencnt, 0); + HFSPLUS_I(inode).flags = 0; + memset(HFSPLUS_I(inode).first_extents, 0, sizeof(hfsplus_extent_rec)); + memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec)); + HFSPLUS_I(inode).alloc_blocks = 0; + HFSPLUS_I(inode).first_blocks = 0; + HFSPLUS_I(inode).cached_start = 0; + HFSPLUS_I(inode).cached_blocks = 0; + HFSPLUS_I(inode).phys_size = 0; + HFSPLUS_I(inode).fs_blocks = 0; + HFSPLUS_I(inode).rsrc_inode = NULL; + if (S_ISDIR(inode->i_mode)) { + inode->i_size = 2; + HFSPLUS_SB(sb).folder_count++; + inode->i_op = &hfsplus_dir_inode_operations; + inode->i_fop = &hfsplus_dir_operations; + } else if (S_ISREG(inode->i_mode)) { + HFSPLUS_SB(sb).file_count++; + inode->i_op = &hfsplus_file_inode_operations; + inode->i_fop = &hfsplus_file_operations; + inode->i_mapping->a_ops = &hfsplus_aops; + HFSPLUS_I(inode).clump_blocks = HFSPLUS_SB(sb).data_clump_blocks; + } else if (S_ISLNK(inode->i_mode)) { + HFSPLUS_SB(sb).file_count++; + inode->i_op = &page_symlink_inode_operations; + inode->i_mapping->a_ops = &hfsplus_aops; + HFSPLUS_I(inode).clump_blocks = 1; + } else + HFSPLUS_SB(sb).file_count++; + insert_inode_hash(inode); + mark_inode_dirty(inode); + sb->s_dirt = 1; + + return inode; +} + +void hfsplus_delete_inode(struct inode *inode) +{ + struct super_block *sb = inode->i_sb; + + if (S_ISDIR(inode->i_mode)) { + HFSPLUS_SB(sb).folder_count--; + sb->s_dirt = 1; + return; + } + HFSPLUS_SB(sb).file_count--; + if (S_ISREG(inode->i_mode)) { + if (!inode->i_nlink) { + inode->i_size = 0; + hfsplus_file_truncate(inode); + } + } else if (S_ISLNK(inode->i_mode)) { + inode->i_size = 0; + hfsplus_file_truncate(inode); + } + sb->s_dirt = 1; +} + +void hfsplus_inode_read_fork(struct inode *inode, struct hfsplus_fork_raw *fork) +{ + struct super_block *sb = inode->i_sb; + u32 count; + int i; + + memcpy(&HFSPLUS_I(inode).first_extents, &fork->extents, + sizeof(hfsplus_extent_rec)); + for (count = 0, i = 0; i < 8; i++) + count += be32_to_cpu(fork->extents[i].block_count); + HFSPLUS_I(inode).first_blocks = count; + memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec)); + HFSPLUS_I(inode).cached_start = 0; + HFSPLUS_I(inode).cached_blocks = 0; + + HFSPLUS_I(inode).alloc_blocks = be32_to_cpu(fork->total_blocks); + inode->i_size = HFSPLUS_I(inode).phys_size = be64_to_cpu(fork->total_size); + HFSPLUS_I(inode).fs_blocks = (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits; + inode_set_bytes(inode, HFSPLUS_I(inode).fs_blocks << sb->s_blocksize_bits); + HFSPLUS_I(inode).clump_blocks = be32_to_cpu(fork->clump_size) >> HFSPLUS_SB(sb).alloc_blksz_shift; + if (!HFSPLUS_I(inode).clump_blocks) + HFSPLUS_I(inode).clump_blocks = HFSPLUS_IS_RSRC(inode) ? HFSPLUS_SB(sb).rsrc_clump_blocks : + HFSPLUS_SB(sb).data_clump_blocks; +} + +void hfsplus_inode_write_fork(struct inode *inode, struct hfsplus_fork_raw *fork) +{ + memcpy(&fork->extents, &HFSPLUS_I(inode).first_extents, + sizeof(hfsplus_extent_rec)); + fork->total_size = cpu_to_be64(inode->i_size); + fork->total_blocks = cpu_to_be32(HFSPLUS_I(inode).alloc_blocks); +} + +int hfsplus_cat_read_inode(struct inode *inode, struct hfs_find_data *fd) +{ + hfsplus_cat_entry entry; + int res = 0; + u16 type; + + type = hfs_bnode_read_u16(fd->bnode, fd->entryoffset); + + HFSPLUS_I(inode).dev = 0; + inode->i_blksize = HFSPLUS_SB(inode->i_sb).alloc_blksz; + if (type == HFSPLUS_FOLDER) { + struct hfsplus_cat_folder *folder = &entry.folder; + + if (fd->entrylength < sizeof(struct hfsplus_cat_folder)) + /* panic? */; + hfs_bnode_read(fd->bnode, &entry, fd->entryoffset, + sizeof(struct hfsplus_cat_folder)); + hfsplus_get_perms(inode, &folder->permissions, 1); + inode->i_nlink = 1; + inode->i_size = 2 + be32_to_cpu(folder->valence); + inode->i_atime = hfsp_mt2ut(folder->access_date); + inode->i_mtime = hfsp_mt2ut(folder->content_mod_date); + inode->i_ctime = inode->i_mtime; + HFSPLUS_I(inode).fs_blocks = 0; + inode->i_op = &hfsplus_dir_inode_operations; + inode->i_fop = &hfsplus_dir_operations; + } else if (type == HFSPLUS_FILE) { + struct hfsplus_cat_file *file = &entry.file; + + if (fd->entrylength < sizeof(struct hfsplus_cat_file)) + /* panic? */; + hfs_bnode_read(fd->bnode, &entry, fd->entryoffset, + sizeof(struct hfsplus_cat_file)); + + hfsplus_inode_read_fork(inode, HFSPLUS_IS_DATA(inode) ? + &file->data_fork : &file->rsrc_fork); + hfsplus_get_perms(inode, &file->permissions, 0); + inode->i_nlink = 1; + if (S_ISREG(inode->i_mode)) { + if (file->permissions.dev) + inode->i_nlink = be32_to_cpu(file->permissions.dev); + inode->i_op = &hfsplus_file_inode_operations; + inode->i_fop = &hfsplus_file_operations; + inode->i_mapping->a_ops = &hfsplus_aops; + } else if (S_ISLNK(inode->i_mode)) { + inode->i_op = &page_symlink_inode_operations; + inode->i_mapping->a_ops = &hfsplus_aops; + } else { + init_special_inode(inode, inode->i_mode, + be32_to_cpu(file->permissions.dev)); + } + inode->i_atime = hfsp_mt2ut(file->access_date); + inode->i_mtime = hfsp_mt2ut(file->content_mod_date); + inode->i_ctime = inode->i_mtime; + } else { + printk("HFS+-fs: bad catalog entry used to create inode\n"); + res = -EIO; + } + return res; +} + +int hfsplus_cat_write_inode(struct inode *inode) +{ + struct inode *main_inode = inode; + struct hfs_find_data fd; + hfsplus_cat_entry entry; + + if (HFSPLUS_IS_RSRC(inode)) + main_inode = HFSPLUS_I(inode).rsrc_inode; + + if (!main_inode->i_nlink) + return 0; + + if (hfs_find_init(HFSPLUS_SB(main_inode->i_sb).cat_tree, &fd)) + /* panic? */ + return -EIO; + + if (hfsplus_find_cat(main_inode->i_sb, main_inode->i_ino, &fd)) + /* panic? */ + goto out; + + if (S_ISDIR(main_inode->i_mode)) { + struct hfsplus_cat_folder *folder = &entry.folder; + + if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) + /* panic? */; + hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, + sizeof(struct hfsplus_cat_folder)); + /* simple node checks? */ + hfsplus_set_perms(inode, &folder->permissions); + folder->access_date = hfsp_ut2mt(inode->i_atime); + folder->content_mod_date = hfsp_ut2mt(inode->i_mtime); + folder->attribute_mod_date = hfsp_ut2mt(inode->i_ctime); + folder->valence = cpu_to_be32(inode->i_size - 2); + hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, + sizeof(struct hfsplus_cat_folder)); + } else if (HFSPLUS_IS_RSRC(inode)) { + struct hfsplus_cat_file *file = &entry.file; + hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, + sizeof(struct hfsplus_cat_file)); + hfsplus_inode_write_fork(inode, &file->rsrc_fork); + hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, + sizeof(struct hfsplus_cat_file)); + } else { + struct hfsplus_cat_file *file = &entry.file; + + if (fd.entrylength < sizeof(struct hfsplus_cat_file)) + /* panic? */; + hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, + sizeof(struct hfsplus_cat_file)); + hfsplus_inode_write_fork(inode, &file->data_fork); + if (S_ISREG(inode->i_mode)) + HFSPLUS_I(inode).dev = inode->i_nlink; + if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) + HFSPLUS_I(inode).dev = kdev_t_to_nr(inode->i_rdev); + hfsplus_set_perms(inode, &file->permissions); + if ((file->permissions.rootflags | file->permissions.userflags) & HFSPLUS_FLG_IMMUTABLE) + file->flags |= cpu_to_be16(HFSPLUS_FILE_LOCKED); + else + file->flags &= cpu_to_be16(~HFSPLUS_FILE_LOCKED); + file->access_date = hfsp_ut2mt(inode->i_atime); + file->content_mod_date = hfsp_ut2mt(inode->i_mtime); + file->attribute_mod_date = hfsp_ut2mt(inode->i_ctime); + hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, + sizeof(struct hfsplus_cat_file)); + } +out: + hfs_find_exit(&fd); + return 0; +} |