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Fri, 13 Dec 2019 05:53:40 +0000 (GMT) From: Namjae Jeon To: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org Cc: gregkh@linuxfoundation.org, valdis.kletnieks@vt.edu, hch@lst.de, sj1557.seo@samsung.com, Namjae Jeon Subject: [PATCH v7 05/13] exfat: add file operations Date: Fri, 13 Dec 2019 00:50:20 -0500 Message-Id: <20191213055028.5574-6-namjae.jeon@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20191213055028.5574-1-namjae.jeon@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrBKsWRmVeSWpSXmKPExsWy7bCmvm6K+udYg/ZHOhbNi9ezWaxcfZTJ Ys/ekywWl3fNYbP4Mb3eYsu/I6wWl95/YHFg99g/dw27x+6bDWwefVtWMXp83iTncWj7G7YA 1qgcm4zUxJTUIoXUvOT8lMy8dFsl7+B453hTMwNDXUNLC3MlhbzE3FRbJRefAF23zBygK5QU yhJzSoFCAYnFxUr6djZF+aUlqQoZ+cUltkqpBSk5BYYGBXrFibnFpXnpesn5uVaGBgZGpkCV CTkZux/eZi147lvRe7eFvYFxn10XIyeHhICJxIe7k1i6GLk4hAR2MEq839TLDOF8YpSY+/Id O4TzjVFiU+8qdpiWzTOXQCX2MkrMmTSNHa5l/adOti5GDg42AW2JP1tEQRpEBOwlNs8+ALaD WaCFUWLB6R/MIAlhoEnX/jSzgdgsAqoSO07PZwLp5RWwltjyQwhimbzE6g0HwMo5BWwk5k3+ ALZLQmABm8TD179YIYpcJO68vM8EYQtLvDq+BepSKYmX/W3sIDMlBKolPu5nhgh3MEq8+G4L YRtL3Fy/gRWkhFlAU2L9Ln2IsKLEzt9zGUFsZgE+iXdfe1ghpvBKdLRBXaYq0XfpMNRSaYmu 9g9QSz0ktkz9wQoJkX5Giat97xknMMrNQtiwgJFxFaNYakFxbnpqsWGBMXKEbWIEpzIt8x2M G875HGIU4GBU4uFdkfgpVog1say4MvcQowQHs5IIr30NUIg3JbGyKrUoP76oNCe1+BCjKTAc JzJLiSbnA9NsXkm8oamRsbGxhYmZuZmpsZI4L8ePi7FCAumJJanZqakFqUUwfUwcnFINjGEl IQ8jwvuC4uf0mz7lORPXtlX97e3a5uD/rpGrw5lLPx5YP7nPsud5o/OjOWfXbFugG6z+1UR/ /f8prT0vd8xz17Q74Ov07Ej87BOl67T11Lmn/41nEc7hKk/lf3Jpf7jixzwdtj883+dLn8qP vlxaY327yqSLT/IZ1+0nXy2XWt1mW/uASYmlOCPRUIu5qDgRAJRWrQV7AwAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrALMWRmVeSWpSXmKPExsWy7bCSvG6K+udYgxNPOCyaF69ns1i5+iiT xZ69J1ksLu+aw2bxY3q9xZZ/R1gtLr3/wOLA7rF/7hp2j903G9g8+rasYvT4vEnO49D2N2wB rFFcNimpOZllqUX6dglcGbsf3mYteO5b0Xu3hb2BcZ9dFyMnh4SAicTmmUvYuxi5OIQEdjNK PJv5igUiIS1x7MQZ5i5GDiBbWOLw4WKQsJDAB0aJ9rciIGE2AW2JP1tEQcIiAo4SvbsOs4CM YRboYpR41PSNGSQhDDT/2p9mNhCbRUBVYsfp+UwgvbwC1hJbfghBbJKXWL3hAFg5p4CNxLzJ H9ghVllL3H37im0CI98CRoZVjJKpBcW56bnFhgVGeanlesWJucWleel6yfm5mxjB4aaltYPx xIn4Q4wCHIxKPLwrEj/FCrEmlhVX5h5ilOBgVhLhta8BCvGmJFZWpRblxxeV5qQWH2KU5mBR EueVzz8WKSSQnliSmp2aWpBaBJNl4uCUamBk3nhJ6Sjjub/Tv6Z48d0XN1vkxh9q9yXeyfmc 5vGtPa9WSrx2b3tjs/7Xp//q0drav8vu1d6blDLVUXV2vdCjvOz1yU8/blq1tqft//HsRUXb Z4YVWOtOsA+W3Mk25UqVStLC0jL21WGP+XtO9t9Yt/ACq6dOyObee8Lc3jy96y7o1LIvZtBS YinOSDTUYi4qTgQANjCyaDMCAAA= X-CMS-MailID: 20191213055340epcas1p424dbbfbabc709d2087058573463367a3 X-Msg-Generator: CA X-Sendblock-Type: SVC_REQ_APPROVE CMS-TYPE: 101P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20191213055340epcas1p424dbbfbabc709d2087058573463367a3 References: <20191213055028.5574-1-namjae.jeon@samsung.com> Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org This adds the implementation of file operations for exfat. Signed-off-by: Namjae Jeon Signed-off-by: Sungjong Seo --- fs/exfat/file.c | 343 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 343 insertions(+) create mode 100644 fs/exfat/file.c diff --git a/fs/exfat/file.c b/fs/exfat/file.c new file mode 100644 index 000000000000..3baa46c09c99 --- /dev/null +++ b/fs/exfat/file.c @@ -0,0 +1,343 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. + */ + +#include +#include +#include + +#include "exfat_raw.h" +#include "exfat_fs.h" + +static int exfat_cont_expand(struct inode *inode, loff_t size) +{ + struct address_space *mapping = inode->i_mapping; + loff_t start = i_size_read(inode), count = size - i_size_read(inode); + int err, err2; + + err = generic_cont_expand_simple(inode, size); + if (err) + return err; + + inode->i_ctime = inode->i_mtime = current_time(inode); + mark_inode_dirty(inode); + + if (!IS_SYNC(inode)) + return 0; + + err = filemap_fdatawrite_range(mapping, start, start + count - 1); + err2 = sync_mapping_buffers(mapping); + if (!err) + err = err2; + err2 = write_inode_now(inode, 1); + if (!err) + err = err2; + if (err) + return err; + + return filemap_fdatawait_range(mapping, start, start + count - 1); +} + +static bool exfat_allow_set_time(struct exfat_sb_info *sbi, struct inode *inode) +{ + mode_t allow_utime = sbi->options.allow_utime; + + if (!uid_eq(current_fsuid(), inode->i_uid)) { + if (in_group_p(inode->i_gid)) + allow_utime >>= 3; + if (allow_utime & MAY_WRITE) + return true; + } + + /* use a default check */ + return false; +} + +static int exfat_sanitize_mode(const struct exfat_sb_info *sbi, + struct inode *inode, umode_t *mode_ptr) +{ + mode_t i_mode, mask, perm; + + i_mode = inode->i_mode; + + mask = (S_ISREG(i_mode) || S_ISLNK(i_mode)) ? + sbi->options.fs_fmask : sbi->options.fs_dmask; + perm = *mode_ptr & ~(S_IFMT | mask); + + /* Of the r and x bits, all (subject to umask) must be present.*/ + if ((perm & 0555) != (i_mode & 0555)) + return -EPERM; + + if (exfat_mode_can_hold_ro(inode)) { + /* + * Of the w bits, either all (subject to umask) or none must + * be present. + */ + if ((perm & 0222) && ((perm & 0222) != (0222 & ~mask))) + return -EPERM; + } else { + /* + * If exfat_mode_can_hold_ro(inode) is false, can't change + * w bits. + */ + if ((perm & 0222) != (0222 & ~mask)) + return -EPERM; + } + + *mode_ptr &= S_IFMT | perm; + + return 0; +} + +/* resize the file length */ +int __exfat_truncate(struct inode *inode, loff_t new_size) +{ + unsigned int num_clusters_new, num_clusters_phys; + unsigned int last_clu = EXFAT_FREE_CLUSTER; + struct exfat_chain clu; + struct exfat_timestamp tm; + struct exfat_dentry *ep, *ep2; + struct super_block *sb = inode->i_sb; + struct exfat_sb_info *sbi = EXFAT_SB(sb); + struct exfat_inode_info *ei = EXFAT_I(inode); + struct exfat_entry_set_cache *es = NULL; + int evict = (ei->dir.dir == DIR_DELETED) ? 1 : 0; + + /* check if the given file ID is opened */ + if (ei->type != TYPE_FILE && ei->type != TYPE_DIR) + return -EPERM; + + exfat_set_vol_flags(sb, VOL_DIRTY); + + num_clusters_new = EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi); + num_clusters_phys = + EXFAT_B_TO_CLU_ROUND_UP(EXFAT_I(inode)->i_size_ondisk, sbi); + + exfat_chain_set(&clu, ei->start_clu, num_clusters_phys, ei->flags); + + if (new_size > 0) { + /* + * Truncate FAT chain num_clusters after the first cluster + * num_clusters = min(new, phys); + */ + unsigned int num_clusters = + min(num_clusters_new, num_clusters_phys); + + /* + * Follow FAT chain + * (defensive coding - works fine even with corrupted FAT table + */ + if (clu.flags == ALLOC_NO_FAT_CHAIN) { + clu.dir += num_clusters; + clu.size -= num_clusters; + } else { + while (num_clusters > 0) { + last_clu = clu.dir; + if (exfat_get_next_cluster(sb, &(clu.dir))) + return -EIO; + + num_clusters--; + clu.size--; + } + } + } else { + ei->flags = ALLOC_NO_FAT_CHAIN; + ei->start_clu = EXFAT_EOF_CLUSTER; + } + + i_size_write(inode, new_size); + + if (ei->type == TYPE_FILE) + ei->attr |= ATTR_ARCHIVE; + + /* update the directory entry */ + if (!evict) { + es = exfat_get_dentry_set(sb, &(ei->dir), ei->entry, + ES_ALL_ENTRIES, &ep); + if (!es) + return -EIO; + ep2 = ep + 1; + + exfat_set_entry_time(ep, exfat_tm_now(EXFAT_SB(sb), &tm), + TM_MODIFY); + ep->file_attr = cpu_to_le16(ei->attr); + + /* File size should be zero if there is no cluster allocated */ + if (ei->start_clu == EXFAT_EOF_CLUSTER) + ep->stream_valid_size = ep->stream_size = 0; + else { + ep->stream_valid_size = cpu_to_le64(new_size); + ep->stream_size = ep->stream_valid_size; + } + + if (new_size == 0) { + /* Any directory can not be truncated to zero */ + WARN_ON(ei->type != TYPE_FILE); + + ep2->stream_flags = ALLOC_FAT_CHAIN; + ep2->stream_start_clu = EXFAT_FREE_CLUSTER; + } + + if (exfat_update_dir_chksum_with_entry_set(sb, es, + inode_needs_sync(inode))) + return -EIO; + kfree(es); + } + + /* cut off from the FAT chain */ + if (ei->flags == ALLOC_FAT_CHAIN && last_clu != EXFAT_FREE_CLUSTER && + last_clu != EXFAT_EOF_CLUSTER) { + if (exfat_ent_set(sb, last_clu, EXFAT_EOF_CLUSTER)) + return -EIO; + } + + /* invalidate cache and free the clusters */ + /* clear exfat cache */ + exfat_cache_inval_inode(inode); + + /* hint information */ + ei->hint_bmap.off = EXFAT_EOF_CLUSTER; + ei->hint_bmap.clu = EXFAT_EOF_CLUSTER; + if (ei->rwoffset > new_size) + ei->rwoffset = new_size; + + /* hint_stat will be used if this is directory. */ + ei->hint_stat.eidx = 0; + ei->hint_stat.clu = ei->start_clu; + ei->hint_femp.eidx = EXFAT_HINT_NONE; + + /* free the clusters */ + if (exfat_free_cluster(inode, &clu)) + return -EIO; + + exfat_set_vol_flags(sb, VOL_CLEAN); + + return 0; +} + +void exfat_truncate(struct inode *inode, loff_t size) +{ + struct super_block *sb = inode->i_sb; + struct exfat_sb_info *sbi = EXFAT_SB(sb); + unsigned int blocksize = 1 << inode->i_blkbits; + loff_t aligned_size; + int err; + + mutex_lock(&sbi->s_lock); + if (EXFAT_I(inode)->start_clu == 0) { + /* + * Empty start_clu != ~0 (not allocated) + */ + exfat_fs_error(sb, "tried to truncate zeroed cluster."); + goto write_size; + } + + err = __exfat_truncate(inode, i_size_read(inode)); + if (err) + goto write_size; + + inode->i_ctime = inode->i_mtime = current_time(inode); + if (IS_DIRSYNC(inode)) + exfat_sync_inode(inode); + else + mark_inode_dirty(inode); + + inode->i_blocks = ((i_size_read(inode) + (sbi->cluster_size - 1)) & + ~(sbi->cluster_size - 1)) >> inode->i_blkbits; +write_size: + aligned_size = i_size_read(inode); + if (aligned_size & (blocksize - 1)) { + aligned_size |= (blocksize - 1); + aligned_size++; + } + + if (EXFAT_I(inode)->i_size_ondisk > i_size_read(inode)) + EXFAT_I(inode)->i_size_ondisk = aligned_size; + + if (EXFAT_I(inode)->i_size_aligned > i_size_read(inode)) + EXFAT_I(inode)->i_size_aligned = aligned_size; + mutex_unlock(&sbi->s_lock); +} + +int exfat_getattr(const struct path *path, struct kstat *stat, + unsigned int request_mask, unsigned int query_flags) +{ + struct inode *inode = d_backing_inode(path->dentry); + + generic_fillattr(inode, stat); + stat->blksize = EXFAT_SB(inode->i_sb)->cluster_size; + return 0; +} + +int exfat_setattr(struct dentry *dentry, struct iattr *attr) +{ + struct exfat_sb_info *sbi = EXFAT_SB(dentry->d_sb); + struct inode *inode = dentry->d_inode; + unsigned int ia_valid; + int error; + + if ((attr->ia_valid & ATTR_SIZE) && + attr->ia_size > i_size_read(inode)) { + error = exfat_cont_expand(inode, attr->ia_size); + if (error || attr->ia_valid == ATTR_SIZE) + return error; + attr->ia_valid &= ~ATTR_SIZE; + } + + /* Check for setting the inode time. */ + ia_valid = attr->ia_valid; + if ((ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET)) && + exfat_allow_set_time(sbi, inode)) { + attr->ia_valid &= ~(ATTR_MTIME_SET | ATTR_ATIME_SET | + ATTR_TIMES_SET); + } + + error = setattr_prepare(dentry, attr); + attr->ia_valid = ia_valid; + if (error) + return error; + + if (((attr->ia_valid & ATTR_UID) && + !uid_eq(attr->ia_uid, sbi->options.fs_uid)) || + ((attr->ia_valid & ATTR_GID) && + !gid_eq(attr->ia_gid, sbi->options.fs_gid)) || + ((attr->ia_valid & ATTR_MODE) && + (attr->ia_mode & ~(S_IFREG | S_IFLNK | S_IFDIR | 0777)))) + return -EPERM; + + /* + * We don't return -EPERM here. Yes, strange, but this is too + * old behavior. + */ + if (attr->ia_valid & ATTR_MODE) { + if (exfat_sanitize_mode(sbi, inode, &attr->ia_mode) < 0) + attr->ia_valid &= ~ATTR_MODE; + } + + if (attr->ia_valid & ATTR_SIZE) { + down_write(&EXFAT_I(inode)->truncate_lock); + truncate_setsize(inode, attr->ia_size); + exfat_truncate(inode, attr->ia_size); + up_write(&EXFAT_I(inode)->truncate_lock); + } + + setattr_copy(inode, attr); + mark_inode_dirty(inode); + + return error; +} + +const struct file_operations exfat_file_operations = { + .llseek = generic_file_llseek, + .read_iter = generic_file_read_iter, + .write_iter = generic_file_write_iter, + .mmap = generic_file_mmap, + .fsync = generic_file_fsync, + .splice_read = generic_file_splice_read, +}; + +const struct inode_operations exfat_file_inode_operations = { + .setattr = exfat_setattr, + .getattr = exfat_getattr, +};