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Mon, 2 Mar 2020 15:26:23 +0900 (KST) Received: from localhost.localdomain (unknown [10.88.103.87]) by epsmtip2.samsung.com (KnoxPortal) with ESMTPA id 20200302062623epsmtip24b37e8e0e63a481a3676a78f8f7251d8~4aLIdcPCq2328723287epsmtip2t; Mon, 2 Mar 2020 06:26:23 +0000 (GMT) From: Namjae Jeon To: viro@zeniv.linux.org.uk Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, gregkh@linuxfoundation.org, valdis.kletnieks@vt.edu, hch@lst.de, sj1557.seo@samsung.com, pali.rohar@gmail.com, arnd@arndb.de, linkinjeon@gmail.com, Namjae Jeon Subject: [PATCH v14 09/14] exfat: add misc operations Date: Mon, 2 Mar 2020 15:21:40 +0900 Message-Id: <20200302062145.1719-10-namjae.jeon@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200302062145.1719-1-namjae.jeon@samsung.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrNJsWRmVeSWpSXmKPExsWy7bCmgS7/8pg4g+8tOhZ/Jx1jt2hevJ7N YuXqo0wW1+/eYrbYs/cki8XlXXPYLH5Mr7eYePo3k8WWf0dYLS69/8Bicf7vcVYHbo/fvyYx euycdZfdY//cNeweu282sHn0bVnF6PF5k5zHoe1v2Dw2PXnLFMARlWOTkZqYklqkkJqXnJ+S mZduq+QdHO8cb2pmYKhraGlhrqSQl5ibaqvk4hOg65aZA3SokkJZYk4pUCggsbhYSd/Opii/ tCRVISO/uMRWKbUgJafA0KBArzgxt7g0L10vOT/XytDAwMgUqDIhJ6P1/RymglbtihO7W5kb GE8pdTFyckgImEhcWf+MrYuRi0NIYAejxLNXn5kgnE+MEounL4XKfGOUmLZkIitMy9t1Zxkh EnsZJRZs2MwCkgBr+XFZsYuRg4NNQFvizxZRkLCIgLTEmf5LYFOZBRqYJJoPNLGDJIQFTCW6 fq5hBrFZBFQlDvx4xwZi8wrYSHzadYwdYpm8xOoNB8BqOIHid3ZdYISoEZQ4OfMJ2F5moJrm rbOZQRZICLSzS9xofAl1qYvEnTePoQYJS7w6vgXKlpL4/G4vG8ihEgLVEh/3M0OEOxglXny3 hbCNJW6u38AKUsIsoCmxfpc+RFhRYufvuYwQa/kk3n3tYYWYwivR0SYEUaIq0XfpMBOELS3R 1f4BaqmHxN75n6HB1s8o0byvhXECo8IsJN/MQvLNLITNCxiZVzGKpRYU56anFhsWGCJH8CZG cMLVMt3BOOWczyFGAQ5GJR7eHc+j44RYE8uKK3MPMUpwMCuJ8PpyAoV4UxIrq1KL8uOLSnNS iw8xmgIDfiKzlGhyPjAb5JXEG5oaGRsbW5iYmZuZGiuJ8z6M1IwTEkhPLEnNTk0tSC2C6WPi 4JRqYPRfz2OxzPDDXiaph5ML0vl/z++evyOmU1ZUdssqrVsaqw4b/DE+3BzUYR369vJ8N9Gu 24923mdseZ/Nuyr7sKB5m+H8CM4T0ycLSiWGnF4Xd0bzwJ2bpc+XnBdrO1170uFR+q20Rya6 9nNd8/Z2nOhv/eFanx66h7eW53X1aubC5En3A/q7NJRYijMSDbWYi4oTAR5gAoLOAwAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFupmkeLIzCtJLcpLzFFi42LZdlhJXpd/eUycwanZ4hZ/Jx1jt2hevJ7N YuXqo0wW1+/eYrbYs/cki8XlXXPYLH5Mr7eYePo3k8WWf0dYLS69/8Bicf7vcVYHbo/fvyYx euycdZfdY//cNeweu282sHn0bVnF6PF5k5zHoe1v2Dw2PXnLFMARxWWTkpqTWZZapG+XwJXR +n4OU0GrdsWJ3a3MDYynlLoYOTkkBEwk3q47y9jFyMUhJLCbUeLHl1tsEAlpiWMnzjB3MXIA 2cIShw8XQ9R8YJTY/PYxI0icTUBb4s8WUZByEaDyM/2XmEBqmAV6mCQ+T1nMBJIQFjCV6Pq5 hhnEZhFQlTjw4x3YfF4BG4lPu46xQ+ySl1i94QBYDSdQ/M6uC4wgtpCAtcTTF3eZIeoFJU7O fMICspdZQF1i/TwhkDAzUGvz1tnMExgFZyGpmoVQNQtJ1QJG5lWMkqkFxbnpucWGBYZ5qeV6 xYm5xaV56XrJ+bmbGMFRpKW5g/HykvhDjAIcjEo8vDufR8cJsSaWFVfmHmKU4GBWEuH15QQK 8aYkVlalFuXHF5XmpBYfYpTmYFES532adyxSSCA9sSQ1OzW1ILUIJsvEwSnVwMjxxzJaJTJm rdeqPKOzk0s6/a7djonVPVcrdl75cEsL54oakY8P3hoHaB7fqdbqdebph1+vrrjnPy2PcbB/ 6S+klf3ar/jCxRflkgtK6zIXcvSesWlmtjyy3u6hnMf8M8/CNe/x/o9W+3jqqOfvaS3ba9fO b+4LYH7cv2qJXtNEsfaHWoqTlyixFGckGmoxFxUnAgA9jqZZngIAAA== X-CMS-MailID: 20200302062623epcas1p11c5190e04bac06999674e4e41ac800d8 X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-Sendblock-Type: SVC_REQ_APPROVE CMS-TYPE: 101P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20200302062623epcas1p11c5190e04bac06999674e4e41ac800d8 References: <20200302062145.1719-1-namjae.jeon@samsung.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This adds the implementation of misc operations for exfat. Signed-off-by: Namjae Jeon Signed-off-by: Sungjong Seo Reviewed-by: Arnd Bergmann Reviewed-by: Pali Rohár Reviewed-by: Christoph Hellwig --- fs/exfat/misc.c | 163 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 163 insertions(+) create mode 100644 fs/exfat/misc.c diff --git a/fs/exfat/misc.c b/fs/exfat/misc.c new file mode 100644 index 000000000000..14a3300848f6 --- /dev/null +++ b/fs/exfat/misc.c @@ -0,0 +1,163 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Written 1992,1993 by Werner Almesberger + * 22/11/2000 - Fixed fat_date_unix2dos for dates earlier than 01/01/1980 + * and date_dos2unix for date==0 by Igor Zhbanov(bsg@uniyar.ac.ru) + * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. + */ + +#include +#include +#include +#include + +#include "exfat_raw.h" +#include "exfat_fs.h" + +/* + * exfat_fs_error reports a file system problem that might indicate fa data + * corruption/inconsistency. Depending on 'errors' mount option the + * panic() is called, or error message is printed FAT and nothing is done, + * or filesystem is remounted read-only (default behavior). + * In case the file system is remounted read-only, it can be made writable + * again by remounting it. + */ +void __exfat_fs_error(struct super_block *sb, int report, const char *fmt, ...) +{ + struct exfat_mount_options *opts = &EXFAT_SB(sb)->options; + va_list args; + struct va_format vaf; + + if (report) { + va_start(args, fmt); + vaf.fmt = fmt; + vaf.va = &args; + exfat_msg(sb, KERN_ERR, "error, %pV\n", &vaf); + va_end(args); + } + + if (opts->errors == EXFAT_ERRORS_PANIC) { + panic("exFAT-fs (%s): fs panic from previous error\n", + sb->s_id); + } else if (opts->errors == EXFAT_ERRORS_RO && !sb_rdonly(sb)) { + sb->s_flags |= SB_RDONLY; + exfat_msg(sb, KERN_ERR, "Filesystem has been set read-only"); + } +} + +/* + * exfat_msg() - print preformated EXFAT specific messages. + * All logs except what uses exfat_fs_error() should be written by exfat_msg() + */ +void exfat_msg(struct super_block *sb, const char *level, const char *fmt, ...) +{ + struct va_format vaf; + va_list args; + + va_start(args, fmt); + vaf.fmt = fmt; + vaf.va = &args; + /* level means KERN_ pacility level */ + printk("%sexFAT-fs (%s): %pV\n", level, sb->s_id, &vaf); + va_end(args); +} + +#define SECS_PER_MIN (60) +#define TIMEZONE_SEC(x) ((x) * 15 * SECS_PER_MIN) + +static void exfat_adjust_tz(struct timespec64 *ts, u8 tz_off) +{ + if (tz_off <= 0x3F) + ts->tv_sec -= TIMEZONE_SEC(tz_off); + else /* 0x40 <= (tz_off & 0x7F) <=0x7F */ + ts->tv_sec += TIMEZONE_SEC(0x80 - tz_off); +} + +/* Convert a EXFAT time/date pair to a UNIX date (seconds since 1 1 70). */ +void exfat_get_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts, + u8 tz, __le16 time, __le16 date, u8 time_ms) +{ + u16 t = le16_to_cpu(time); + u16 d = le16_to_cpu(date); + + ts->tv_sec = mktime64(1980 + (d >> 9), d >> 5 & 0x000F, d & 0x001F, + t >> 11, (t >> 5) & 0x003F, (t & 0x001F) << 1); + + + /* time_ms field represent 0 ~ 199(1990 ms) */ + if (time_ms) { + ts->tv_sec += time_ms / 100; + ts->tv_nsec = (time_ms % 100) * 10 * NSEC_PER_MSEC; + } + + if (tz & EXFAT_TZ_VALID) + /* Adjust timezone to UTC0. */ + exfat_adjust_tz(ts, tz & ~EXFAT_TZ_VALID); + else + /* Convert from local time to UTC using time_offset. */ + ts->tv_sec -= sbi->options.time_offset * SECS_PER_MIN; +} + +/* Convert linear UNIX date to a EXFAT time/date pair. */ +void exfat_set_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts, + u8 *tz, __le16 *time, __le16 *date, u8 *time_ms) +{ + struct tm tm; + u16 t, d; + + time64_to_tm(ts->tv_sec, 0, &tm); + t = (tm.tm_hour << 11) | (tm.tm_min << 5) | (tm.tm_sec >> 1); + d = ((tm.tm_year - 80) << 9) | ((tm.tm_mon + 1) << 5) | tm.tm_mday; + + *time = cpu_to_le16(t); + *date = cpu_to_le16(d); + + /* time_ms field represent 0 ~ 199(1990 ms) */ + if (time_ms) + *time_ms = (tm.tm_sec & 1) * 100 + + ts->tv_nsec / (10 * NSEC_PER_MSEC); + + /* + * Record 00h value for OffsetFromUtc field and 1 value for OffsetValid + * to indicate that local time and UTC are the same. + */ + *tz = EXFAT_TZ_VALID; +} + +unsigned short exfat_calc_chksum_2byte(void *data, int len, + unsigned short chksum, int type) +{ + int i; + unsigned char *c = (unsigned char *)data; + + for (i = 0; i < len; i++, c++) { + if (((i == 2) || (i == 3)) && (type == CS_DIR_ENTRY)) + continue; + chksum = (((chksum & 1) << 15) | ((chksum & 0xFFFE) >> 1)) + + (unsigned short)*c; + } + return chksum; +} + +void exfat_update_bh(struct super_block *sb, struct buffer_head *bh, int sync) +{ + set_bit(EXFAT_SB_DIRTY, &EXFAT_SB(sb)->s_state); + set_buffer_uptodate(bh); + mark_buffer_dirty(bh); + + if (sync) + sync_dirty_buffer(bh); +} + +void exfat_chain_set(struct exfat_chain *ec, unsigned int dir, + unsigned int size, unsigned char flags) +{ + ec->dir = dir; + ec->size = size; + ec->flags = flags; +} + +void exfat_chain_dup(struct exfat_chain *dup, struct exfat_chain *ec) +{ + return exfat_chain_set(dup, ec->dir, ec->size, ec->flags); +} -- 2.17.1