From 034dd340b08be1f2f0477ad16131d609f9dbd53c Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 30 Aug 2026 09:22:00 -0700 Subject: Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace Pull tracing fixes from Steven Rostedt: - Fix error output of boot instance creation failure Currently if a boot instance creation fails, instead of printing out the name of the instance that failed, it prints "(null)". That is because it prints "cur_str" that had already been processed by strsep(). Print the saved name instead. While at it, print the error code of the failure. - Fix use-after-free for same named historgrams Histograms can be named so that they can be used in multiple events. But if the named histogram has a variable attached, the second event that uses the named histogram which duplicates it and needs to free the original after duplication leaves the old variable in place and still visible. If another histogram uses than variable, it will use the stale one which will try to reference the freed duplicate histogram and crash the kernel. Free the duplicate variables along with the duplicated histogram data. - Check return value of kthread_run() in event self test The events self tests uses a kthread for testing but does not check if it succeeded in creating a kthread. If the kthread creation were to fail, the code will still try to call kthread_stop() on the error returned. - Fix race between reading trace_pipe and updating subbuffer size If a user is reading the trace_pipe file at the same time they update the ring buffer sub-buffer size, can cause the trace_pipe read to read stale data. Add trace_access_lock() around updating the ring buffer sub-buffer size. - Fix eventfs_inode on failure path in creation of the events directory In the creation of the "events" directory, if after allocating the eventfs_inode a failure is detected, it calls cleanup_ei() which calls free_ei(). The free_ei() will test if eventfs_inode being freed has no children. It is a bug if it does. But on the failure case of the creation of the "events" directory, the children lists have not yet been initialized and the free will trigger a warning because list_empty() on an uninitialized list returns false. Move the initialization into init_ei() where it makes more sense and makes sure that a created eventfs_inode has its lists initialized upon creation. - Check return value of kthread_run() in ftrace direct sample code The sample code that shows how to use the ftrace direct calls does not test the return of kthread_run() to see if it succeeds. Return a failure if the kthread_run() doesn't succeed. - Clear user events state on fork in case of alloc failure On fork, the child gets a pointer to the parent's user events state. It makes a copy of it then updates the child's pointer to it. But if the allocation fails, the duplication function leaves the child with a pointer to its parent's descriptor. When the child cleans up its data, it will free the parent's descriptor while the parent is still using it. In the duplication function, set the child's user_event_mm to NULL before testing if the allocation succeeded, and when it exits it will not free the parent's descriptor. - Fix retry exhaustion in simple ring buffer reader swap simple_ring_buffer_swap_reader_page() starts with retry set to 8 and post-decrements it only after a failed link replacement. On the final attempt, a successful replacement leaves retry at zero, while a failed replacement leaves it at -1. But the check for success expects the retry value to be non-zero and exits with an error on zero. This is the opposite result. Fix it. - Fail nicely when the remote swap_reader_page() returns an error Currently, if the swap_reader_page() of a remote buffer fails, it triggers a WARN_ON_ONCE() and continues normally. Instead, have it exit with an error and a pr_warn() print instead of a full WARNING. * tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: ring-buffer: Stop remote reader update when page swap fails tracing: Fix retry exhaustion in simple ring buffer reader swap tracing/user_events: Clear copied tracing state before fork duplication samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify eventfs: Initialize ei->children and ei->list in init_ei() tracing: Fix use-after-free in trace_pipe read on sub-buffer order change tracing: Fix crash passing ERR_PTR to kthread_stop() tracing: Fix use-after-free with same-name named triggers tracing: Fix logged instance name on creation failure --- fs/hfsplus/super.c | 803 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 803 insertions(+) create mode 100644 fs/hfsplus/super.c (limited to 'fs/hfsplus/super.c') diff --git a/fs/hfsplus/super.c b/fs/hfsplus/super.c new file mode 100644 index 000000000..ff7d6b333 --- /dev/null +++ b/fs/hfsplus/super.c @@ -0,0 +1,803 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * linux/fs/hfsplus/super.c + * + * Copyright (C) 2001 + * Brad Boyer (flar@allandria.com) + * (C) 2003 Ardis Technologies + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static struct inode *hfsplus_alloc_inode(struct super_block *sb); +static void hfsplus_free_inode(struct inode *inode); + +#include "hfsplus_fs.h" +#include "xattr.h" + +static int hfsplus_system_read_inode(struct inode *inode) +{ + struct hfsplus_vh *vhdr = HFSPLUS_SB(inode->i_sb)->s_vhdr; + + switch (inode->i_ino) { + case HFSPLUS_EXT_CNID: + hfsplus_inode_read_fork(inode, &vhdr->ext_file); + inode->i_mapping->a_ops = &hfsplus_btree_aops; + break; + case HFSPLUS_CAT_CNID: + hfsplus_inode_read_fork(inode, &vhdr->cat_file); + inode->i_mapping->a_ops = &hfsplus_btree_aops; + break; + case HFSPLUS_ALLOC_CNID: + hfsplus_inode_read_fork(inode, &vhdr->alloc_file); + inode->i_mapping->a_ops = &hfsplus_aops; + break; + case HFSPLUS_START_CNID: + hfsplus_inode_read_fork(inode, &vhdr->start_file); + break; + case HFSPLUS_ATTR_CNID: + hfsplus_inode_read_fork(inode, &vhdr->attr_file); + inode->i_mapping->a_ops = &hfsplus_btree_aops; + break; + default: + return -EIO; + } + + /* + * Assign a dummy file type, for may_open() requires that + * an inode has a valid file type. + */ + inode->i_mode = S_IFREG; + + return 0; +} + +struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino) +{ + struct hfs_find_data fd; + struct inode *inode; + int err; + + inode = iget_locked(sb, ino); + if (!inode) + return ERR_PTR(-ENOMEM); + if (!(inode_state_read_once(inode) & I_NEW)) + return inode; + + atomic_set(&HFSPLUS_I(inode)->opencnt, 0); + HFSPLUS_I(inode)->first_blocks = 0; + HFSPLUS_I(inode)->clump_blocks = 0; + HFSPLUS_I(inode)->alloc_blocks = 0; + HFSPLUS_I(inode)->cached_start = U32_MAX; + HFSPLUS_I(inode)->cached_blocks = 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)->extent_state = 0; + mutex_init(&HFSPLUS_I(inode)->extents_lock); + HFSPLUS_I(inode)->rsrc_inode = NULL; + HFSPLUS_I(inode)->create_date = 0; + HFSPLUS_I(inode)->linkid = 0; + HFSPLUS_I(inode)->flags = 0; + HFSPLUS_I(inode)->fs_blocks = 0; + HFSPLUS_I(inode)->userflags = 0; + HFSPLUS_I(inode)->subfolders = 0; + HFSPLUS_I(inode)->phys_size = 0; + + if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID || + inode->i_ino == HFSPLUS_ROOT_CNID) { + err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd); + if (!err) { + err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd); + if (!err) + err = hfsplus_cat_read_inode(inode, &fd); + hfs_find_exit(&fd); + } + } else { + err = hfsplus_system_read_inode(inode); + } + + if (err) { + iget_failed(inode); + return ERR_PTR(err); + } + + unlock_new_inode(inode); + return inode; +} + +static int hfsplus_system_write_inode(struct inode *inode) +{ + struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb); + struct hfsplus_vh *vhdr = sbi->s_vhdr; + struct hfsplus_fork_raw *fork; + struct hfs_btree *tree = NULL; + + switch (inode->i_ino) { + case HFSPLUS_EXT_CNID: + fork = &vhdr->ext_file; + tree = sbi->ext_tree; + break; + case HFSPLUS_CAT_CNID: + fork = &vhdr->cat_file; + tree = sbi->cat_tree; + break; + case HFSPLUS_ALLOC_CNID: + fork = &vhdr->alloc_file; + break; + case HFSPLUS_START_CNID: + fork = &vhdr->start_file; + break; + case HFSPLUS_ATTR_CNID: + fork = &vhdr->attr_file; + tree = sbi->attr_tree; + break; + default: + return -EIO; + } + + if (fork->total_size != cpu_to_be64(inode->i_size)) { + set_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags); + hfsplus_mark_mdb_dirty(inode->i_sb); + } + hfsplus_inode_write_fork(inode, fork); + if (tree) { + mutex_lock_nested(&tree->tree_lock, + hfsplus_btree_lock_class(tree)); + int err = hfs_btree_write(tree); + mutex_unlock(&tree->tree_lock); + + if (err) { + pr_err("b-tree write err: %d, ino %llu\n", + err, inode->i_ino); + return err; + } + } + return 0; +} + +static int hfsplus_write_inode(struct inode *inode, + struct writeback_control *wbc) +{ + int err; + + hfs_dbg("ino %llu\n", inode->i_ino); + + err = hfsplus_ext_write_extent(inode); + if (err) + return err; + + if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID || + inode->i_ino == HFSPLUS_ROOT_CNID) + return hfsplus_cat_write_inode(inode); + else + return hfsplus_system_write_inode(inode); +} + +static void hfsplus_evict_inode(struct inode *inode) +{ + hfs_dbg("ino %llu\n", inode->i_ino); + truncate_inode_pages_final(&inode->i_data); + clear_inode(inode); + if (HFSPLUS_IS_RSRC(inode)) { + HFSPLUS_I(HFSPLUS_I(inode)->rsrc_inode)->rsrc_inode = NULL; + iput(HFSPLUS_I(inode)->rsrc_inode); + } +} + +int hfsplus_commit_superblock(struct super_block *sb) +{ + struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); + struct hfsplus_vh *vhdr = sbi->s_vhdr; + int write_backup = 0; + int error = 0, error2; + + hfs_dbg("starting...\n"); + + mutex_lock(&sbi->vh_mutex); + mutex_lock(&sbi->alloc_mutex); + vhdr->free_blocks = cpu_to_be32(sbi->free_blocks); + vhdr->next_cnid = cpu_to_be32(sbi->next_cnid); + vhdr->folder_count = cpu_to_be32(sbi->folder_count); + vhdr->file_count = cpu_to_be32(sbi->file_count); + + hfs_dbg("free_blocks %u, next_cnid %u, folder_count %u, file_count %u\n", + sbi->free_blocks, sbi->next_cnid, + sbi->folder_count, sbi->file_count); + + if (test_and_clear_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags)) { + memcpy(sbi->s_backup_vhdr, sbi->s_vhdr, sizeof(*sbi->s_vhdr)); + write_backup = 1; + } + + error2 = hfsplus_submit_bio(sb, + sbi->part_start + HFSPLUS_VOLHEAD_SECTOR, + sbi->s_vhdr_buf, NULL, REQ_OP_WRITE); + if (!error) + error = error2; + if (!write_backup) + goto out; + + error2 = hfsplus_submit_bio(sb, + sbi->part_start + sbi->sect_count - 2, + sbi->s_backup_vhdr_buf, NULL, REQ_OP_WRITE); + if (!error) + error = error2; +out: + mutex_unlock(&sbi->alloc_mutex); + mutex_unlock(&sbi->vh_mutex); + + hfs_dbg("finished: err %d\n", error); + + return error; +} + +static int hfsplus_sync_fs(struct super_block *sb, int wait) +{ + struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); + int error, error2; + + if (!wait) + return 0; + + hfs_dbg("starting...\n"); + + /* + * Explicitly write out the special metadata inodes. + * + * While these special inodes are marked as hashed and written + * out peridocically by the flusher threads we redirty them + * during writeout of normal inodes, and thus the life lock + * prevents us from getting the latest state to disk. + */ + error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping); + error2 = filemap_write_and_wait(sbi->ext_tree->inode->i_mapping); + if (!error) + error = error2; + if (sbi->attr_tree) { + error2 = + filemap_write_and_wait(sbi->attr_tree->inode->i_mapping); + if (!error) + error = error2; + } + error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping); + if (!error) + error = error2; + + error2 = hfsplus_commit_superblock(sb); + if (!error) + error = error2; + + if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags)) + blkdev_issue_flush(sb->s_bdev); + + hfs_dbg("finished: err %d\n", error); + + return error; +} + +static void delayed_sync_fs(struct work_struct *work) +{ + int err; + struct hfsplus_sb_info *sbi; + + sbi = container_of(work, struct hfsplus_sb_info, sync_work.work); + + spin_lock(&sbi->work_lock); + sbi->work_queued = 0; + spin_unlock(&sbi->work_lock); + + err = hfsplus_sync_fs(sbi->alloc_file->i_sb, 1); + if (err) + pr_err("delayed sync fs err %d\n", err); +} + +void hfsplus_mark_mdb_dirty(struct super_block *sb) +{ + struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); + unsigned long delay; + + if (sb_rdonly(sb)) + return; + + spin_lock(&sbi->work_lock); + if (!sbi->work_queued) { + delay = msecs_to_jiffies(dirty_writeback_interval * 10); + queue_delayed_work(system_dfl_long_wq, &sbi->sync_work, delay); + sbi->work_queued = 1; + } + spin_unlock(&sbi->work_lock); +} + +static void delayed_free(struct rcu_head *p) +{ + struct hfsplus_sb_info *sbi = container_of(p, struct hfsplus_sb_info, rcu); + + unload_nls(sbi->nls); + kfree(sbi); +} + +static void hfsplus_put_super(struct super_block *sb) +{ + struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); + + hfs_dbg("starting...\n"); + + cancel_delayed_work_sync(&sbi->sync_work); + + if (!sb_rdonly(sb) && sbi->s_vhdr) { + struct hfsplus_vh *vhdr = sbi->s_vhdr; + + vhdr->modify_date = hfsp_now2mt(); + vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT); + vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT); + + hfsplus_sync_fs(sb, 1); + } + + iput(sbi->alloc_file); + iput(sbi->hidden_dir); + hfs_btree_close(sbi->attr_tree); + hfs_btree_close(sbi->cat_tree); + hfs_btree_close(sbi->ext_tree); + kfree(sbi->s_vhdr_buf); + kfree(sbi->s_backup_vhdr_buf); + hfs_dbg("finished\n"); +} + +static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf) +{ + struct super_block *sb = dentry->d_sb; + struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); + u64 id = huge_encode_dev(sb->s_bdev->bd_dev); + + buf->f_type = HFSPLUS_SUPER_MAGIC; + buf->f_bsize = sb->s_blocksize; + buf->f_blocks = sbi->total_blocks << sbi->fs_shift; + buf->f_bfree = sbi->free_blocks << sbi->fs_shift; + buf->f_bavail = buf->f_bfree; + buf->f_files = 0xFFFFFFFF; + buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid; + buf->f_fsid = u64_to_fsid(id); + buf->f_namelen = HFSPLUS_MAX_STRLEN; + + return 0; +} + +static int hfsplus_reconfigure(struct fs_context *fc) +{ + struct super_block *sb = fc->root->d_sb; + + sync_filesystem(sb); + if ((bool)(fc->sb_flags & SB_RDONLY) == sb_rdonly(sb)) + return 0; + if (!(fc->sb_flags & SB_RDONLY)) { + struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); + struct hfsplus_vh *vhdr = sbi->s_vhdr; + + if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) { + pr_warn("filesystem was not cleanly unmounted, running fsck.hfsplus is recommended. leaving read-only.\n"); + sb->s_flags |= SB_RDONLY; + fc->sb_flags |= SB_RDONLY; + } else if (test_bit(HFSPLUS_SB_FORCE, &sbi->flags)) { + /* nothing */ + } else if (vhdr->attributes & + cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) { + pr_warn("filesystem is marked locked, leaving read-only.\n"); + sb->s_flags |= SB_RDONLY; + fc->sb_flags |= SB_RDONLY; + } else if (vhdr->attributes & + cpu_to_be32(HFSPLUS_VOL_JOURNALED)) { + pr_warn("filesystem is marked journaled, leaving read-only.\n"); + sb->s_flags |= SB_RDONLY; + fc->sb_flags |= SB_RDONLY; + } + } + return 0; +} + +static const struct super_operations hfsplus_sops = { + .alloc_inode = hfsplus_alloc_inode, + .free_inode = hfsplus_free_inode, + .write_inode = hfsplus_write_inode, + .evict_inode = hfsplus_evict_inode, + .put_super = hfsplus_put_super, + .sync_fs = hfsplus_sync_fs, + .statfs = hfsplus_statfs, + .show_options = hfsplus_show_options, +}; + +void hfsplus_prepare_volume_header_for_commit(struct hfsplus_vh *vhdr) +{ + vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION); + vhdr->modify_date = hfsp_now2mt(); + be32_add_cpu(&vhdr->write_count, 1); + vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT); + vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT); +} + +static inline int hfsplus_get_hidden_dir_entry(struct super_block *sb, + const struct qstr *str, + hfsplus_cat_entry *entry) +{ + struct hfs_find_data fd; + int err; + + err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd); + if (unlikely(err)) + return err; + + err = hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, str); + if (unlikely(err)) + goto free_fd; + + err = hfsplus_brec_read_cat(&fd, entry); + if (err) + err = -ENOENT; + +free_fd: + hfs_find_exit(&fd); + return err; +} + +static int hfsplus_fill_super(struct super_block *sb, struct fs_context *fc) +{ + struct hfsplus_vh *vhdr; + struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); + hfsplus_cat_entry entry; + struct inode *root, *inode; + struct qstr str; + struct nls_table *nls; + u64 last_fs_block, last_fs_page; + int silent = fc->sb_flags & SB_SILENT; + int err; + + mutex_init(&sbi->alloc_mutex); + mutex_init(&sbi->vh_mutex); + spin_lock_init(&sbi->work_lock); + INIT_DELAYED_WORK(&sbi->sync_work, delayed_sync_fs); + + err = -EINVAL; + if (!sbi->nls) { + /* try utf8 first, as this is the old default behaviour */ + sbi->nls = load_nls("utf8"); + if (!sbi->nls) + sbi->nls = load_nls_default(); + } + + /* temporarily use utf8 to correctly find the hidden dir below */ + nls = sbi->nls; + sbi->nls = load_nls("utf8"); + if (!sbi->nls) { + pr_err("unable to load nls for utf8\n"); + goto out_unload_nls; + } + + /* Grab the volume header */ + if (hfsplus_read_wrapper(sb)) { + if (!silent) + pr_warn("unable to find HFS+ superblock\n"); + goto out_unload_nls; + } + vhdr = sbi->s_vhdr; + + /* Copy parts of the volume header into the superblock */ + sb->s_magic = HFSPLUS_VOLHEAD_SIG; + if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION || + be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) { + pr_err("wrong filesystem version\n"); + goto out_free_vhdr; + } + sbi->total_blocks = be32_to_cpu(vhdr->total_blocks); + sbi->free_blocks = be32_to_cpu(vhdr->free_blocks); + sbi->next_cnid = be32_to_cpu(vhdr->next_cnid); + sbi->file_count = be32_to_cpu(vhdr->file_count); + sbi->folder_count = be32_to_cpu(vhdr->folder_count); + sbi->data_clump_blocks = + be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift; + if (!sbi->data_clump_blocks) + sbi->data_clump_blocks = 1; + sbi->rsrc_clump_blocks = + be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift; + if (!sbi->rsrc_clump_blocks) + sbi->rsrc_clump_blocks = 1; + + err = -EFBIG; + last_fs_block = sbi->total_blocks - 1; + last_fs_page = (last_fs_block << sbi->alloc_blksz_shift) >> + PAGE_SHIFT; + + if ((last_fs_block > (sector_t)(~0ULL) >> (sbi->alloc_blksz_shift - 9)) || + (last_fs_page > (pgoff_t)(~0ULL))) { + pr_err("filesystem size too large\n"); + goto out_free_vhdr; + } + + /* Set up operations so we can load metadata */ + sb->s_op = &hfsplus_sops; + sb->s_maxbytes = MAX_LFS_FILESIZE; + + if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) { + pr_warn("Filesystem was not cleanly unmounted, running fsck.hfsplus is recommended. mounting read-only.\n"); + sb->s_flags |= SB_RDONLY; + } else if (test_and_clear_bit(HFSPLUS_SB_FORCE, &sbi->flags)) { + /* nothing */ + } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) { + pr_warn("Filesystem is marked locked, mounting read-only.\n"); + sb->s_flags |= SB_RDONLY; + } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) && + !sb_rdonly(sb)) { + pr_warn("write access to a journaled filesystem is not supported, use the force option at your own risk, mounting read-only.\n"); + sb->s_flags |= SB_RDONLY; + } + + err = -EINVAL; + + /* Load metadata objects (B*Trees) */ + sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID); + if (!sbi->ext_tree) { + pr_err("failed to load extents file\n"); + goto out_free_vhdr; + } + sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID); + if (!sbi->cat_tree) { + pr_err("failed to load catalog file\n"); + goto out_close_ext_tree; + } + atomic_set(&sbi->attr_tree_state, HFSPLUS_EMPTY_ATTR_TREE); + if (vhdr->attr_file.total_blocks != 0) { + sbi->attr_tree = hfs_btree_open(sb, HFSPLUS_ATTR_CNID); + if (!sbi->attr_tree) { + pr_err("failed to load attributes file\n"); + goto out_close_cat_tree; + } + atomic_set(&sbi->attr_tree_state, HFSPLUS_VALID_ATTR_TREE); + } + sb->s_xattr = hfsplus_xattr_handlers; + + inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID); + if (IS_ERR(inode)) { + pr_err("failed to load allocation file\n"); + err = PTR_ERR(inode); + goto out_close_attr_tree; + } + sbi->alloc_file = inode; + + /* Load the root directory */ + root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID); + if (IS_ERR(root)) { + pr_err("failed to load root directory\n"); + err = PTR_ERR(root); + goto out_put_alloc_file; + } + + set_default_d_op(sb, &hfsplus_dentry_operations); + sb->s_root = d_make_root(root); + if (!sb->s_root) { + err = -ENOMEM; + goto out_put_alloc_file; + } + + str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1; + str.name = HFSP_HIDDENDIR_NAME; + err = hfsplus_get_hidden_dir_entry(sb, &str, &entry); + if (err == -ENOENT) { + /* + * Hidden directory is absent or it cannot be read. + */ + } else if (unlikely(err)) { + goto out_put_root; + } else { + if (entry.type != cpu_to_be16(HFSPLUS_FOLDER)) { + err = -EIO; + goto out_put_root; + } + inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id)); + if (IS_ERR(inode)) { + err = PTR_ERR(inode); + goto out_put_root; + } + sbi->hidden_dir = inode; + } + + if (!sb_rdonly(sb)) { + /* + * H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused + * all three are registered with Apple for our use + */ + hfsplus_prepare_volume_header_for_commit(vhdr); + hfsplus_sync_fs(sb, 1); + + if (!sbi->hidden_dir) { + mutex_lock(&sbi->vh_mutex); + sbi->hidden_dir = hfsplus_new_inode(sb, root, S_IFDIR); + if (!sbi->hidden_dir) { + mutex_unlock(&sbi->vh_mutex); + err = -ENOMEM; + goto out_put_root; + } + err = hfsplus_create_cat(sbi->hidden_dir->i_ino, root, + &str, sbi->hidden_dir); + if (err) { + mutex_unlock(&sbi->vh_mutex); + goto out_put_hidden_dir; + } + + err = hfsplus_init_security(sbi->hidden_dir, + root, &str); + if (err == -EOPNOTSUPP) + err = 0; /* Operation is not supported. */ + else if (err) { + /* + * Try to delete anyway without + * error analysis. + */ + hfsplus_delete_cat(sbi->hidden_dir->i_ino, + root, &str); + mutex_unlock(&sbi->vh_mutex); + goto out_put_hidden_dir; + } + + mutex_unlock(&sbi->vh_mutex); + hfsplus_mark_inode_dirty(HFSPLUS_CAT_TREE_I(sb), + HFSPLUS_I_CAT_DIRTY); + hfsplus_mark_inode_dirty(sbi->hidden_dir, + HFSPLUS_I_CAT_DIRTY); + } + } + + unload_nls(sbi->nls); + sbi->nls = nls; + return 0; + +out_put_hidden_dir: + cancel_delayed_work_sync(&sbi->sync_work); + iput(sbi->hidden_dir); +out_put_root: + dput(sb->s_root); + sb->s_root = NULL; +out_put_alloc_file: + iput(sbi->alloc_file); +out_close_attr_tree: + hfs_btree_close(sbi->attr_tree); +out_close_cat_tree: + hfs_btree_close(sbi->cat_tree); +out_close_ext_tree: + hfs_btree_close(sbi->ext_tree); +out_free_vhdr: + kfree(sbi->s_vhdr_buf); + kfree(sbi->s_backup_vhdr_buf); +out_unload_nls: + unload_nls(nls); + return err; +} + +MODULE_AUTHOR("Brad Boyer"); +MODULE_DESCRIPTION("Extended Macintosh Filesystem"); +MODULE_LICENSE("GPL"); + +static struct kmem_cache *hfsplus_inode_cachep; + +static struct inode *hfsplus_alloc_inode(struct super_block *sb) +{ + struct hfsplus_inode_info *i; + + i = alloc_inode_sb(sb, hfsplus_inode_cachep, GFP_KERNEL); + return i ? &i->vfs_inode : NULL; +} + +static void hfsplus_free_inode(struct inode *inode) +{ + kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode)); +} + +#define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info) + +static int hfsplus_get_tree(struct fs_context *fc) +{ + return get_tree_bdev(fc, hfsplus_fill_super); +} + +static void hfsplus_free_fc(struct fs_context *fc) +{ + kfree(fc->s_fs_info); +} + +static const struct fs_context_operations hfsplus_context_ops = { + .parse_param = hfsplus_parse_param, + .get_tree = hfsplus_get_tree, + .reconfigure = hfsplus_reconfigure, + .free = hfsplus_free_fc, +}; + +static int hfsplus_init_fs_context(struct fs_context *fc) +{ + struct hfsplus_sb_info *sbi; + + sbi = kzalloc_obj(struct hfsplus_sb_info); + if (!sbi) + return -ENOMEM; + + if (fc->purpose != FS_CONTEXT_FOR_RECONFIGURE) + hfsplus_fill_defaults(sbi); + + fc->s_fs_info = sbi; + fc->ops = &hfsplus_context_ops; + + return 0; +} + +static void hfsplus_kill_super(struct super_block *sb) +{ + struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); + + kill_block_super(sb); + call_rcu(&sbi->rcu, delayed_free); +} + +static struct file_system_type hfsplus_fs_type = { + .owner = THIS_MODULE, + .name = "hfsplus", + .kill_sb = hfsplus_kill_super, + .fs_flags = FS_REQUIRES_DEV, + .init_fs_context = hfsplus_init_fs_context, +}; +MODULE_ALIAS_FS("hfsplus"); + +static void hfsplus_init_once(void *p) +{ + struct hfsplus_inode_info *i = p; + + inode_init_once(&i->vfs_inode); +} + +static int __init init_hfsplus_fs(void) +{ + int err; + + hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache", + HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, + hfsplus_init_once); + if (!hfsplus_inode_cachep) + return -ENOMEM; + err = hfsplus_create_attr_tree_cache(); + if (err) + goto destroy_inode_cache; + err = register_filesystem(&hfsplus_fs_type); + if (err) + goto destroy_attr_tree_cache; + return 0; + +destroy_attr_tree_cache: + hfsplus_destroy_attr_tree_cache(); + +destroy_inode_cache: + kmem_cache_destroy(hfsplus_inode_cachep); + + return err; +} + +static void __exit exit_hfsplus_fs(void) +{ + unregister_filesystem(&hfsplus_fs_type); + + /* + * Make sure all delayed rcu free inodes are flushed before we + * destroy cache. + */ + rcu_barrier(); + hfsplus_destroy_attr_tree_cache(); + kmem_cache_destroy(hfsplus_inode_cachep); +} + +module_init(init_hfsplus_fs) +module_exit(exit_hfsplus_fs) -- cgit v1.3.1