/* * Squashfs - a compressed read only filesystem for Linux * * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008 * Phillip Lougher * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2, * or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * * dir.c */ /* * This file implements code to read directories from disk. * * See namei.c for a description of directory organisation on disk. */ #include #include #include #include "squashfs_fs.h" #include "squashfs_fs_sb.h" #include "squashfs_fs_i.h" #include "squashfs.h" static const unsigned char squashfs_filetype_table[] = { DT_UNKNOWN, DT_DIR, DT_REG, DT_LNK, DT_BLK, DT_CHR, DT_FIFO, DT_SOCK }; /* * Lookup offset (f_pos) in the directory index, returning the * metadata block containing it. * * If we get an error reading the index then return the part of the index * (if any) we have managed to read - the index isn't essential, just * quicker. */ static int get_dir_index_using_offset(struct super_block *sb, u64 *next_block, int *next_offset, u64 index_start, int index_offset, int i_count, u64 f_pos) { struct squashfs_sb_info *msblk = sb->s_fs_info; int err, i, index, length = 0; unsigned int size; struct squashfs_dir_index dir_index; TRACE("Entered get_dir_index_using_offset, i_count %d, f_pos %lld\n", i_count, f_pos); /* * Translate from external f_pos to the internal f_pos. This * is offset by 3 because we invent "." and ".." entries which are * not actually stored in the directory. */ if (f_pos <= 3) return f_pos; f_pos -= 3; for (i = 0; i < i_count; i++) { err = squashfs_read_metadata(sb, &dir_index, &index_start, &index_offset, sizeof(dir_index)); if (err < 0) break; index = le32_to_cpu(dir_index.index); if (index > f_pos) /* * Found the index we're looking for. */ break; size = le32_to_cpu(dir_index.size) + 1; /* size should never be larger than SQUASHFS_NAME_LEN */ if (size > SQUASHFS_NAME_LEN) break; err = squashfs_read_metadata(sb, NULL, &index_start, &index_offset, size); if (err < 0) break; length = index; *next_block = le32_to_cpu(dir_index.start_block) + msblk->directory_table; } *next_offset = (length + *next_offset) % SQUASHFS_METADATA_SIZE; /* * Translate back from internal f_pos to external f_pos. */ return length + 3; } static int squashfs_readdir(struct file *file, struct dir_context *ctx) { struct inode *inode = file_inode(file); struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info; u64 block = squashfs_i(inode)->start + msblk->directory_table; int offset = squashfs_i(inode)->offset, length, err; unsigned int inode_number, dir_count, size, type; struct squashfs_dir_header dirh; struct squashfs_dir_entry *dire; TRACE("Entered squashfs_readdir [%llx:%x]\n", block, offset); dire = kmalloc(sizeof(*dire) + SQUASHFS_NAME_LEN + 1, GFP_KERNEL); if (dire == NULL) { ERROR("Failed to allocate squashfs_dir_entry\n"); goto finish; } /* * Return "." and ".." entries as the first two filenames in the * directory. To maximise compression these two entries are not * stored in the directory, and so we invent them here. * * It also means that the external f_pos is offset by 3 from the * on-disk directory f_pos. */ while (ctx->pos < 3) { char *name; int i_ino; if (ctx->pos == 0) { name = "."; size = 1; i_ino = inode->i_ino; } else { name = ".."; size = 2; i_ino = squashfs_i(inode)->parent; } if (!dir_emit(ctx, name, size, i_ino, squashfs_filetype_table[1])) goto finish; ctx->pos += size; } length = get_dir_index_using_offset(inode->i_sb, &block, &offset, squashfs_i(inode)->dir_idx_start, squashfs_i(inode)->dir_idx_offset, squashfs_i(inode)->dir_idx_cnt, ctx->pos); while (length < i_size_read(inode)) { /* * Read directory header */ err = squashfs_read_metadata(inode->i_sb, &dirh, &block, &offset, sizeof(dirh)); if (err < 0) goto failed_read; length += sizeof(dirh); dir_count = le32_to_cpu(dirh.count) + 1; if (dir_count > SQUASHFS_DIR_COUNT) goto failed_read; while (dir_count--) { /* * Read directory entry. */ err = squashfs_read_metadata(inode->i_sb, dire, &block, &offset, sizeof(*dire)); if (err < 0) goto failed_read; size = le16_to_cpu(dire->size) + 1; /* size should never be larger than SQUASHFS_NAME_LEN */ if (size > SQUASHFS_NAME_LEN) goto failed_read; err = squashfs_read_metadata(inode->i_sb, dire->name, &block, &offset, size); if (err < 0) goto failed_read; length += sizeof(*dire) + size; if (ctx->pos >= length) continue; dire->name[size] = '\0'; inode_number = le32_to_cpu(dirh.inode_number) + ((short) le16_to_cpu(dire->inode_number)); type = le16_to_cpu(dire->type); if (type > SQUASHFS_MAX_DIR_TYPE) goto failed_read; if (!dir_emit(ctx, dire->name, size, inode_number, squashfs_filetype_table[type])) goto finish; ctx->pos = length; } } finish: kfree(dire); return 0; failed_read: ERROR("Unable to read directory block [%llx:%x]\n", block, offset); kfree(dire); return 0; } const struct file_operations squashfs_dir_ops = { .read = generic_read_dir, .iterate_shared = squashfs_readdir, .llseek = generic_file_llseek, }; armsoc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Pull ARM SoC fixes from Arnd Bergmann: "This is a rather large set of bugfixes, as we just returned from the Christmas break. Most of these are relatively unimportant fixes for regressions introduced during the merge window, and about half of the changes are for mach-omap2. A couple of patches are just cleanups and dead code removal that I would not normally have considered for merging after -rc2, but I decided to take them along with the fixes this time. Notable fixes include: - removing the skeleton.dtsi include broke a number of machines, and we have to put empty /chosen nodes back to be able to pass kernel command lines as before - enabling Samsung platforms no longer hardwires CONFIG_HZ to 200, as it had been for no good reason for a long time" * tag 'armsoc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (46 commits) MAINTAINERS: extend PSCI entry to cover the newly add PSCI checker code drivers: psci: annotate timer on stack to silence odebug messages ARM64: defconfig: enable DRM_MESON as module ARM64: dts: meson-gx: Add Graphic Controller nodes ARM64: dts: meson-gxl: fix GPIO include ARM: dts: imx6: Disable "weim" node in the dtsi files ARM: dts: qcom: apq8064: Add missing scm clock ARM: davinci: da8xx: Fix sleeping function called from invalid context ARM: davinci: Make __clk_{enable,disable} functions public ARM: davinci: da850: don't add emac clock to lookup table twice ARM: davinci: da850: fix infinite loop in clk_set_rate() ARM: i.MX: remove map_io callback ARM: dts: vf610-zii-dev-rev-b: Add missing newline ARM: dts: imx6qdl-nitrogen6x: remove duplicate iomux entry ARM: dts: imx31: fix AVIC base address ARM: dts: am572x-idk: Add gpios property to control PCIE_RESETn arm64: dts: vexpress: Support GICC_DIR operations ARM: dts: vexpress: Support GICC_DIR operations firmware: arm_scpi: fix reading sensor values on pre-1.0 SCPI firmwares arm64: dts: msm8996: Add required memory carveouts ...
Diffstat (limited to 'net/caif')