From 4352b8aee98005853aa63f57d6377282de17a33f Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 23 Aug 2026 13:28:57 -0700 Subject: Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux Pull I3C updates from Alexandre Belloni: "A new driver this cycle, for the AMD AXI I3C controller. There are also new features such as IBI wakeup support, SETAASA device discovery and ACPI support for the the DAA methods, meaning we can now communicate with the SPD devices on DDR5 modules. New driver: - AMD AXI I3C master controller Subsystem: - I3C Common Command Code (CCC) handling improvements, especially around GET CCCs - SETAASA device discovery support - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as well as I2C devices on I3C bus - IBI-based wakeup support Drivers: - dw: SETAASA support - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C controller support, PIO queue management support for HCI v1.2 - renesas: improve suspend to RAM support, add runtime PM support" * tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits) i3c: dw: reduce do_daa time if there's no client i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2 i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode i3c: dw: rename "pclk" to "apb" to match dt-binding i3c: dw: make struct dw_i3c_cmd smaller i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding i3c: renesas: Don't register devices when ENTDAA times out i3c: master: dw-i3c-master: fix OD timing for first broadcast i3c: mipi-i3c-hci: Advertise IBI wakeup capability i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev() i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI i3c: master: Reject IBI requests from non-IBI-capable devices i3c: master: Add helper to query bus wakeup requirements i3c: master: Report wakeup events for IBIs i3c: master: Support IBI-based wakeup capability i3c: master: Fix potential UAF in i3c_device_match() i3c: master: Fix potential UAF in i3c_device_uevent() i3c: Make dev->desc locking assumptions explicit i3c: master: Fix use-after-free of master->this ... --- fs/affs/dir.c | 180 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 180 insertions(+) create mode 100644 fs/affs/dir.c (limited to 'fs/affs/dir.c') diff --git a/fs/affs/dir.c b/fs/affs/dir.c new file mode 100644 index 000000000..d2b897ebb --- /dev/null +++ b/fs/affs/dir.c @@ -0,0 +1,180 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * linux/fs/affs/dir.c + * + * (c) 1996 Hans-Joachim Widmaier - Rewritten + * + * (C) 1993 Ray Burr - Modified for Amiga FFS filesystem. + * + * (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem. + * + * (C) 1991 Linus Torvalds - minix filesystem + * + * affs directory handling functions + * + */ + +#include +#include +#include "affs.h" + +struct affs_dir_data { + unsigned long ino; + u64 cookie; +}; + +static int affs_readdir(struct file *, struct dir_context *); + +static loff_t affs_dir_llseek(struct file *file, loff_t offset, int whence) +{ + struct affs_dir_data *data = file->private_data; + + return generic_llseek_cookie(file, offset, whence, &data->cookie); +} + +static int affs_dir_open(struct inode *inode, struct file *file) +{ + struct affs_dir_data *data; + + data = kzalloc_obj(struct affs_dir_data); + if (!data) + return -ENOMEM; + file->private_data = data; + return 0; +} + +static int affs_dir_release(struct inode *inode, struct file *file) +{ + kfree(file->private_data); + return 0; +} + +const struct file_operations affs_dir_operations = { + .open = affs_dir_open, + .read = generic_read_dir, + .llseek = affs_dir_llseek, + .iterate_shared = affs_readdir, + .fsync = affs_file_fsync, + .release = affs_dir_release, + .setlease = generic_setlease, +}; + +/* + * directories can handle most operations... + */ +const struct inode_operations affs_dir_inode_operations = { + .create = affs_create, + .lookup = affs_lookup, + .link = affs_link, + .unlink = affs_unlink, + .symlink = affs_symlink, + .mkdir = affs_mkdir, + .rmdir = affs_rmdir, + .rename = affs_rename2, + .setattr = affs_setattr, +}; + +static int +affs_readdir(struct file *file, struct dir_context *ctx) +{ + struct inode *inode = file_inode(file); + struct affs_dir_data *data = file->private_data; + struct super_block *sb = inode->i_sb; + struct buffer_head *dir_bh = NULL; + struct buffer_head *fh_bh = NULL; + unsigned char *name; + int namelen; + u32 i; + int hash_pos; + int chain_pos; + u32 ino; + int error = 0; + + pr_debug("%s(ino=%llu,f_pos=%llx)\n", __func__, inode->i_ino, ctx->pos); + + if (ctx->pos < 2) { + data->ino = 0; + if (!dir_emit_dots(file, ctx)) + return 0; + } + + affs_lock_dir(inode); + chain_pos = (ctx->pos - 2) & 0xffff; + hash_pos = (ctx->pos - 2) >> 16; + if (chain_pos == 0xffff) { + affs_warning(sb, "readdir", "More than 65535 entries in chain"); + chain_pos = 0; + hash_pos++; + ctx->pos = ((hash_pos << 16) | chain_pos) + 2; + } + dir_bh = affs_bread(sb, inode->i_ino); + if (!dir_bh) + goto out_unlock_dir; + + /* If the directory hasn't changed since the last call to readdir(), + * we can jump directly to where we left off. + */ + ino = data->ino; + if (ino && inode_eq_iversion(inode, data->cookie)) { + pr_debug("readdir() left off=%d\n", ino); + goto inside; + } + if (hash_pos >= AFFS_SB(sb)->s_hashsize) + goto done; + + ino = be32_to_cpu(AFFS_HEAD(dir_bh)->table[hash_pos]); + for (i = 0; ino && i < chain_pos; i++) { + fh_bh = affs_bread(sb, ino); + if (!fh_bh) { + affs_error(sb, "readdir","Cannot read block %d", i); + error = -EIO; + goto out_brelse_dir; + } + ino = be32_to_cpu(AFFS_TAIL(sb, fh_bh)->hash_chain); + affs_brelse(fh_bh); + fh_bh = NULL; + } + if (ino) + goto inside; + hash_pos++; + + for (; hash_pos < AFFS_SB(sb)->s_hashsize; hash_pos++) { + ino = be32_to_cpu(AFFS_HEAD(dir_bh)->table[hash_pos]); + if (!ino) + continue; + ctx->pos = (hash_pos << 16) + 2; +inside: + do { + fh_bh = affs_bread(sb, ino); + if (!fh_bh) { + affs_error(sb, "readdir", + "Cannot read block %d", ino); + break; + } + + namelen = min(AFFS_TAIL(sb, fh_bh)->name[0], + (u8)AFFSNAMEMAX); + name = AFFS_TAIL(sb, fh_bh)->name + 1; + pr_debug("readdir(): dir_emit(\"%.*s\", ino=%u), hash=%d, f_pos=%llx\n", + namelen, name, ino, hash_pos, ctx->pos); + + if (!dir_emit(ctx, name, namelen, ino, DT_UNKNOWN)) + goto done; + ctx->pos++; + ino = be32_to_cpu(AFFS_TAIL(sb, fh_bh)->hash_chain); + affs_brelse(fh_bh); + fh_bh = NULL; + } while (ino); + } +done: + data->cookie = inode_query_iversion(inode); + data->ino = ino; + affs_brelse(fh_bh); + +out_brelse_dir: + affs_brelse(dir_bh); + +out_unlock_dir: + affs_unlock_dir(inode); + return error; +} -- cgit v1.3.1