From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- fs/quota/quota_v2.c | 437 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 437 insertions(+) create mode 100644 fs/quota/quota_v2.c (limited to 'fs/quota/quota_v2.c') diff --git a/fs/quota/quota_v2.c b/fs/quota/quota_v2.c new file mode 100644 index 0000000000..ae99e7b882 --- /dev/null +++ b/fs/quota/quota_v2.c @@ -0,0 +1,437 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * vfsv0 quota IO operations on file + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include "quota_tree.h" +#include "quotaio_v2.h" + +MODULE_AUTHOR("Jan Kara"); +MODULE_DESCRIPTION("Quota format v2 support"); +MODULE_LICENSE("GPL"); + +static void v2r0_mem2diskdqb(void *dp, struct dquot *dquot); +static void v2r0_disk2memdqb(struct dquot *dquot, void *dp); +static int v2r0_is_id(void *dp, struct dquot *dquot); +static void v2r1_mem2diskdqb(void *dp, struct dquot *dquot); +static void v2r1_disk2memdqb(struct dquot *dquot, void *dp); +static int v2r1_is_id(void *dp, struct dquot *dquot); + +static const struct qtree_fmt_operations v2r0_qtree_ops = { + .mem2disk_dqblk = v2r0_mem2diskdqb, + .disk2mem_dqblk = v2r0_disk2memdqb, + .is_id = v2r0_is_id, +}; + +static const struct qtree_fmt_operations v2r1_qtree_ops = { + .mem2disk_dqblk = v2r1_mem2diskdqb, + .disk2mem_dqblk = v2r1_disk2memdqb, + .is_id = v2r1_is_id, +}; + +#define QUOTABLOCK_BITS 10 +#define QUOTABLOCK_SIZE (1 << QUOTABLOCK_BITS) + +static inline qsize_t v2_stoqb(qsize_t space) +{ + return (space + QUOTABLOCK_SIZE - 1) >> QUOTABLOCK_BITS; +} + +static inline qsize_t v2_qbtos(qsize_t blocks) +{ + return blocks << QUOTABLOCK_BITS; +} + +static int v2_read_header(struct super_block *sb, int type, + struct v2_disk_dqheader *dqhead) +{ + ssize_t size; + + size = sb->s_op->quota_read(sb, type, (char *)dqhead, + sizeof(struct v2_disk_dqheader), 0); + if (size != sizeof(struct v2_disk_dqheader)) { + quota_error(sb, "Failed header read: expected=%zd got=%zd", + sizeof(struct v2_disk_dqheader), size); + if (size < 0) + return size; + return -EIO; + } + return 0; +} + +/* Check whether given file is really vfsv0 quotafile */ +static int v2_check_quota_file(struct super_block *sb, int type) +{ + struct v2_disk_dqheader dqhead; + static const uint quota_magics[] = V2_INITQMAGICS; + static const uint quota_versions[] = V2_INITQVERSIONS; + + if (v2_read_header(sb, type, &dqhead)) + return 0; + if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type] || + le32_to_cpu(dqhead.dqh_version) > quota_versions[type]) + return 0; + return 1; +} + +/* Read information header from quota file */ +static int v2_read_file_info(struct super_block *sb, int type) +{ + struct v2_disk_dqinfo dinfo; + struct v2_disk_dqheader dqhead; + struct quota_info *dqopt = sb_dqopt(sb); + struct mem_dqinfo *info = &dqopt->info[type]; + struct qtree_mem_dqinfo *qinfo; + ssize_t size; + unsigned int version; + int ret; + + down_read(&dqopt->dqio_sem); + ret = v2_read_header(sb, type, &dqhead); + if (ret < 0) + goto out; + version = le32_to_cpu(dqhead.dqh_version); + if ((info->dqi_fmt_id == QFMT_VFS_V0 && version != 0) || + (info->dqi_fmt_id == QFMT_VFS_V1 && version != 1)) { + ret = -EINVAL; + goto out; + } + + size = sb->s_op->quota_read(sb, type, (char *)&dinfo, + sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF); + if (size != sizeof(struct v2_disk_dqinfo)) { + quota_error(sb, "Can't read info structure"); + if (size < 0) + ret = size; + else + ret = -EIO; + goto out; + } + info->dqi_priv = kmalloc(sizeof(struct qtree_mem_dqinfo), GFP_NOFS); + if (!info->dqi_priv) { + ret = -ENOMEM; + goto out; + } + qinfo = info->dqi_priv; + if (version == 0) { + /* limits are stored as unsigned 32-bit data */ + info->dqi_max_spc_limit = 0xffffffffLL << QUOTABLOCK_BITS; + info->dqi_max_ino_limit = 0xffffffff; + } else { + /* + * Used space is stored as unsigned 64-bit value in bytes but + * quota core supports only signed 64-bit values so use that + * as a limit + */ + info->dqi_max_spc_limit = 0x7fffffffffffffffLL; /* 2^63-1 */ + info->dqi_max_ino_limit = 0x7fffffffffffffffLL; + } + info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace); + info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace); + /* No flags currently supported */ + info->dqi_flags = 0; + qinfo->dqi_sb = sb; + qinfo->dqi_type = type; + qinfo->dqi_blocks = le32_to_cpu(dinfo.dqi_blocks); + qinfo->dqi_free_blk = le32_to_cpu(dinfo.dqi_free_blk); + qinfo->dqi_free_entry = le32_to_cpu(dinfo.dqi_free_entry); + qinfo->dqi_blocksize_bits = V2_DQBLKSIZE_BITS; + qinfo->dqi_usable_bs = 1 << V2_DQBLKSIZE_BITS; + qinfo->dqi_qtree_depth = qtree_depth(qinfo); + if (version == 0) { + qinfo->dqi_entry_size = sizeof(struct v2r0_disk_dqblk); + qinfo->dqi_ops = &v2r0_qtree_ops; + } else { + qinfo->dqi_entry_size = sizeof(struct v2r1_disk_dqblk); + qinfo->dqi_ops = &v2r1_qtree_ops; + } + ret = -EUCLEAN; + /* Some sanity checks of the read headers... */ + if ((loff_t)qinfo->dqi_blocks << qinfo->dqi_blocksize_bits > + i_size_read(sb_dqopt(sb)->files[type])) { + quota_error(sb, "Number of blocks too big for quota file size (%llu > %llu).", + (loff_t)qinfo->dqi_blocks << qinfo->dqi_blocksize_bits, + i_size_read(sb_dqopt(sb)->files[type])); + goto out_free; + } + if (qinfo->dqi_free_blk >= qinfo->dqi_blocks) { + quota_error(sb, "Free block number too big (%u >= %u).", + qinfo->dqi_free_blk, qinfo->dqi_blocks); + goto out_free; + } + if (qinfo->dqi_free_entry >= qinfo->dqi_blocks) { + quota_error(sb, "Block with free entry too big (%u >= %u).", + qinfo->dqi_free_entry, qinfo->dqi_blocks); + goto out_free; + } + ret = 0; +out_free: + if (ret) { + kfree(info->dqi_priv); + info->dqi_priv = NULL; + } +out: + up_read(&dqopt->dqio_sem); + return ret; +} + +/* Write information header to quota file */ +static int v2_write_file_info(struct super_block *sb, int type) +{ + struct v2_disk_dqinfo dinfo; + struct quota_info *dqopt = sb_dqopt(sb); + struct mem_dqinfo *info = &dqopt->info[type]; + struct qtree_mem_dqinfo *qinfo = info->dqi_priv; + ssize_t size; + + down_write(&dqopt->dqio_sem); + spin_lock(&dq_data_lock); + info->dqi_flags &= ~DQF_INFO_DIRTY; + dinfo.dqi_bgrace = cpu_to_le32(info->dqi_bgrace); + dinfo.dqi_igrace = cpu_to_le32(info->dqi_igrace); + /* No flags currently supported */ + dinfo.dqi_flags = cpu_to_le32(0); + spin_unlock(&dq_data_lock); + dinfo.dqi_blocks = cpu_to_le32(qinfo->dqi_blocks); + dinfo.dqi_free_blk = cpu_to_le32(qinfo->dqi_free_blk); + dinfo.dqi_free_entry = cpu_to_le32(qinfo->dqi_free_entry); + size = sb->s_op->quota_write(sb, type, (char *)&dinfo, + sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF); + up_write(&dqopt->dqio_sem); + if (size != sizeof(struct v2_disk_dqinfo)) { + quota_error(sb, "Can't write info structure"); + return size < 0 ? size : -EIO; + } + return 0; +} + +static void v2r0_disk2memdqb(struct dquot *dquot, void *dp) +{ + struct v2r0_disk_dqblk *d = dp, empty; + struct mem_dqblk *m = &dquot->dq_dqb; + + m->dqb_ihardlimit = le32_to_cpu(d->dqb_ihardlimit); + m->dqb_isoftlimit = le32_to_cpu(d->dqb_isoftlimit); + m->dqb_curinodes = le32_to_cpu(d->dqb_curinodes); + m->dqb_itime = le64_to_cpu(d->dqb_itime); + m->dqb_bhardlimit = v2_qbtos(le32_to_cpu(d->dqb_bhardlimit)); + m->dqb_bsoftlimit = v2_qbtos(le32_to_cpu(d->dqb_bsoftlimit)); + m->dqb_curspace = le64_to_cpu(d->dqb_curspace); + m->dqb_btime = le64_to_cpu(d->dqb_btime); + /* We need to escape back all-zero structure */ + memset(&empty, 0, sizeof(struct v2r0_disk_dqblk)); + empty.dqb_itime = cpu_to_le64(1); + if (!memcmp(&empty, dp, sizeof(struct v2r0_disk_dqblk))) + m->dqb_itime = 0; +} + +static void v2r0_mem2diskdqb(void *dp, struct dquot *dquot) +{ + struct v2r0_disk_dqblk *d = dp; + struct mem_dqblk *m = &dquot->dq_dqb; + struct qtree_mem_dqinfo *info = + sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv; + + d->dqb_ihardlimit = cpu_to_le32(m->dqb_ihardlimit); + d->dqb_isoftlimit = cpu_to_le32(m->dqb_isoftlimit); + d->dqb_curinodes = cpu_to_le32(m->dqb_curinodes); + d->dqb_itime = cpu_to_le64(m->dqb_itime); + d->dqb_bhardlimit = cpu_to_le32(v2_stoqb(m->dqb_bhardlimit)); + d->dqb_bsoftlimit = cpu_to_le32(v2_stoqb(m->dqb_bsoftlimit)); + d->dqb_curspace = cpu_to_le64(m->dqb_curspace); + d->dqb_btime = cpu_to_le64(m->dqb_btime); + d->dqb_id = cpu_to_le32(from_kqid(&init_user_ns, dquot->dq_id)); + if (qtree_entry_unused(info, dp)) + d->dqb_itime = cpu_to_le64(1); +} + +static int v2r0_is_id(void *dp, struct dquot *dquot) +{ + struct v2r0_disk_dqblk *d = dp; + struct qtree_mem_dqinfo *info = + sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv; + + if (qtree_entry_unused(info, dp)) + return 0; + return qid_eq(make_kqid(&init_user_ns, dquot->dq_id.type, + le32_to_cpu(d->dqb_id)), + dquot->dq_id); +} + +static void v2r1_disk2memdqb(struct dquot *dquot, void *dp) +{ + struct v2r1_disk_dqblk *d = dp, empty; + struct mem_dqblk *m = &dquot->dq_dqb; + + m->dqb_ihardlimit = le64_to_cpu(d->dqb_ihardlimit); + m->dqb_isoftlimit = le64_to_cpu(d->dqb_isoftlimit); + m->dqb_curinodes = le64_to_cpu(d->dqb_curinodes); + m->dqb_itime = le64_to_cpu(d->dqb_itime); + m->dqb_bhardlimit = v2_qbtos(le64_to_cpu(d->dqb_bhardlimit)); + m->dqb_bsoftlimit = v2_qbtos(le64_to_cpu(d->dqb_bsoftlimit)); + m->dqb_curspace = le64_to_cpu(d->dqb_curspace); + m->dqb_btime = le64_to_cpu(d->dqb_btime); + /* We need to escape back all-zero structure */ + memset(&empty, 0, sizeof(struct v2r1_disk_dqblk)); + empty.dqb_itime = cpu_to_le64(1); + if (!memcmp(&empty, dp, sizeof(struct v2r1_disk_dqblk))) + m->dqb_itime = 0; +} + +static void v2r1_mem2diskdqb(void *dp, struct dquot *dquot) +{ + struct v2r1_disk_dqblk *d = dp; + struct mem_dqblk *m = &dquot->dq_dqb; + struct qtree_mem_dqinfo *info = + sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv; + + d->dqb_ihardlimit = cpu_to_le64(m->dqb_ihardlimit); + d->dqb_isoftlimit = cpu_to_le64(m->dqb_isoftlimit); + d->dqb_curinodes = cpu_to_le64(m->dqb_curinodes); + d->dqb_itime = cpu_to_le64(m->dqb_itime); + d->dqb_bhardlimit = cpu_to_le64(v2_stoqb(m->dqb_bhardlimit)); + d->dqb_bsoftlimit = cpu_to_le64(v2_stoqb(m->dqb_bsoftlimit)); + d->dqb_curspace = cpu_to_le64(m->dqb_curspace); + d->dqb_btime = cpu_to_le64(m->dqb_btime); + d->dqb_id = cpu_to_le32(from_kqid(&init_user_ns, dquot->dq_id)); + d->dqb_pad = 0; + if (qtree_entry_unused(info, dp)) + d->dqb_itime = cpu_to_le64(1); +} + +static int v2r1_is_id(void *dp, struct dquot *dquot) +{ + struct v2r1_disk_dqblk *d = dp; + struct qtree_mem_dqinfo *info = + sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv; + + if (qtree_entry_unused(info, dp)) + return 0; + return qid_eq(make_kqid(&init_user_ns, dquot->dq_id.type, + le32_to_cpu(d->dqb_id)), + dquot->dq_id); +} + +static int v2_read_dquot(struct dquot *dquot) +{ + struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); + int ret; + + down_read(&dqopt->dqio_sem); + ret = qtree_read_dquot( + sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv, + dquot); + up_read(&dqopt->dqio_sem); + return ret; +} + +static int v2_write_dquot(struct dquot *dquot) +{ + struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); + int ret; + bool alloc = false; + + /* + * If space for dquot is already allocated, we don't need any + * protection as we'll only overwrite the place of dquot. We are + * still protected by concurrent writes of the same dquot by + * dquot->dq_lock. + */ + if (!dquot->dq_off) { + alloc = true; + down_write(&dqopt->dqio_sem); + } else { + down_read(&dqopt->dqio_sem); + } + ret = qtree_write_dquot( + sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv, + dquot); + if (alloc) + up_write(&dqopt->dqio_sem); + else + up_read(&dqopt->dqio_sem); + return ret; +} + +static int v2_release_dquot(struct dquot *dquot) +{ + struct quota_info *dqopt = sb_dqopt(dquot->dq_sb); + int ret; + + down_write(&dqopt->dqio_sem); + ret = qtree_release_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv, dquot); + up_write(&dqopt->dqio_sem); + + return ret; +} + +static int v2_free_file_info(struct super_block *sb, int type) +{ + kfree(sb_dqinfo(sb, type)->dqi_priv); + return 0; +} + +static int v2_get_next_id(struct super_block *sb, struct kqid *qid) +{ + struct quota_info *dqopt = sb_dqopt(sb); + int ret; + + down_read(&dqopt->dqio_sem); + ret = qtree_get_next_id(sb_dqinfo(sb, qid->type)->dqi_priv, qid); + up_read(&dqopt->dqio_sem); + return ret; +} + +static const struct quota_format_ops v2_format_ops = { + .check_quota_file = v2_check_quota_file, + .read_file_info = v2_read_file_info, + .write_file_info = v2_write_file_info, + .free_file_info = v2_free_file_info, + .read_dqblk = v2_read_dquot, + .commit_dqblk = v2_write_dquot, + .release_dqblk = v2_release_dquot, + .get_next_id = v2_get_next_id, +}; + +static struct quota_format_type v2r0_quota_format = { + .qf_fmt_id = QFMT_VFS_V0, + .qf_ops = &v2_format_ops, + .qf_owner = THIS_MODULE +}; + +static struct quota_format_type v2r1_quota_format = { + .qf_fmt_id = QFMT_VFS_V1, + .qf_ops = &v2_format_ops, + .qf_owner = THIS_MODULE +}; + +static int __init init_v2_quota_format(void) +{ + int ret; + + ret = register_quota_format(&v2r0_quota_format); + if (ret) + return ret; + return register_quota_format(&v2r1_quota_format); +} + +static void __exit exit_v2_quota_format(void) +{ + unregister_quota_format(&v2r0_quota_format); + unregister_quota_format(&v2r1_quota_format); +} + +module_init(init_v2_quota_format); +module_exit(exit_v2_quota_format); -- cgit v1.2.3