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fs/quota/quota_v2.c
10.6 KB
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/* * vfsv0 quota IO operations on file */ #include <linux/errno.h> #include <linux/fs.h> #include <linux/mount.h> #include <linux/dqblk_v2.h> |
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#include <linux/kernel.h> #include <linux/init.h> #include <linux/module.h> #include <linux/slab.h> |
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#include <linux/quotaops.h> |
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#include <asm/byteorder.h> |
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#include "quota_tree.h" |
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#include "quotaio_v2.h" |
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MODULE_AUTHOR("Jan Kara"); MODULE_DESCRIPTION("Quota format v2 support"); MODULE_LICENSE("GPL"); #define __QUOTA_V2_PARANOIA |
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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); |
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static const struct qtree_fmt_operations v2r0_qtree_ops = { |
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.mem2disk_dqblk = v2r0_mem2diskdqb, .disk2mem_dqblk = v2r0_disk2memdqb, .is_id = v2r0_is_id, }; |
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static const struct qtree_fmt_operations v2r1_qtree_ops = { |
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.mem2disk_dqblk = v2r1_mem2diskdqb, .disk2mem_dqblk = v2r1_disk2memdqb, .is_id = v2r1_is_id, |
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}; |
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#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; } |
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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)) { |
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quota_error(sb, "Failed header read: expected=%zd got=%zd", sizeof(struct v2_disk_dqheader), size); |
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return 0; } return 1; } |
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/* 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; |
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static const uint quota_magics[] = V2_INITQMAGICS; static const uint quota_versions[] = V2_INITQVERSIONS; |
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if (!v2_read_header(sb, type, &dqhead)) |
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return 0; |
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if (le32_to_cpu(dqhead.dqh_magic) != quota_magics[type] || |
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le32_to_cpu(dqhead.dqh_version) > quota_versions[type]) |
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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; |
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struct v2_disk_dqheader dqhead; |
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struct mem_dqinfo *info = sb_dqinfo(sb, type); |
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struct qtree_mem_dqinfo *qinfo; |
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ssize_t size; |
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unsigned int version; if (!v2_read_header(sb, type, &dqhead)) |
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return -1; |
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version = le32_to_cpu(dqhead.dqh_version); |
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if ((info->dqi_fmt_id == QFMT_VFS_V0 && version != 0) || (info->dqi_fmt_id == QFMT_VFS_V1 && version != 1)) return -1; |
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size = sb->s_op->quota_read(sb, type, (char *)&dinfo, sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF); if (size != sizeof(struct v2_disk_dqinfo)) { |
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quota_error(sb, "Can't read info structure"); |
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return -1; } |
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info->dqi_priv = kmalloc(sizeof(struct qtree_mem_dqinfo), GFP_NOFS); if (!info->dqi_priv) { printk(KERN_WARNING "Not enough memory for quota information structure. "); |
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return -ENOMEM; |
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} qinfo = info->dqi_priv; |
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if (version == 0) { /* limits are stored as unsigned 32-bit data */ |
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info->dqi_max_spc_limit = 0xffffffffLL << QUOTABLOCK_BITS; |
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info->dqi_max_ino_limit = 0xffffffff; |
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} else { |
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/* * 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; |
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} |
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info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace); info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace); |
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/* No flags currently supported */ info->dqi_flags = 0; |
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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); |
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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; } |
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return 0; } /* Write information header to quota file */ static int v2_write_file_info(struct super_block *sb, int type) { struct v2_disk_dqinfo dinfo; |
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struct mem_dqinfo *info = sb_dqinfo(sb, type); |
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struct qtree_mem_dqinfo *qinfo = info->dqi_priv; |
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ssize_t size; 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); |
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/* No flags currently supported */ dinfo.dqi_flags = cpu_to_le32(0); |
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spin_unlock(&dq_data_lock); |
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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); |
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size = sb->s_op->quota_write(sb, type, (char *)&dinfo, sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF); if (size != sizeof(struct v2_disk_dqinfo)) { |
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quota_error(sb, "Can't write info structure"); |
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return -1; } return 0; } |
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static void v2r0_disk2memdqb(struct dquot *dquot, void *dp) |
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{ |
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struct v2r0_disk_dqblk *d = dp, empty; |
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struct mem_dqblk *m = &dquot->dq_dqb; |
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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); |
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m->dqb_bhardlimit = v2_qbtos(le32_to_cpu(d->dqb_bhardlimit)); m->dqb_bsoftlimit = v2_qbtos(le32_to_cpu(d->dqb_bsoftlimit)); |
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m->dqb_curspace = le64_to_cpu(d->dqb_curspace); m->dqb_btime = le64_to_cpu(d->dqb_btime); |
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/* We need to escape back all-zero structure */ |
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memset(&empty, 0, sizeof(struct v2r0_disk_dqblk)); |
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empty.dqb_itime = cpu_to_le64(1); |
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if (!memcmp(&empty, dp, sizeof(struct v2r0_disk_dqblk))) |
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m->dqb_itime = 0; |
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} |
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static void v2r0_mem2diskdqb(void *dp, struct dquot *dquot) |
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{ |
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struct v2r0_disk_dqblk *d = dp; |
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struct mem_dqblk *m = &dquot->dq_dqb; struct qtree_mem_dqinfo *info = |
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sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv; |
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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); |
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d->dqb_bhardlimit = cpu_to_le32(v2_stoqb(m->dqb_bhardlimit)); d->dqb_bsoftlimit = cpu_to_le32(v2_stoqb(m->dqb_bsoftlimit)); |
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d->dqb_curspace = cpu_to_le64(m->dqb_curspace); d->dqb_btime = cpu_to_le64(m->dqb_btime); |
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d->dqb_id = cpu_to_le32(from_kqid(&init_user_ns, dquot->dq_id)); |
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if (qtree_entry_unused(info, dp)) d->dqb_itime = cpu_to_le64(1); |
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} |
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static int v2r0_is_id(void *dp, struct dquot *dquot) { struct v2r0_disk_dqblk *d = dp; struct qtree_mem_dqinfo *info = |
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sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv; |
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if (qtree_entry_unused(info, dp)) return 0; |
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return qid_eq(make_kqid(&init_user_ns, dquot->dq_id.type, le32_to_cpu(d->dqb_id)), dquot->dq_id); |
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} 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 = |
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sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv; |
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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); |
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d->dqb_id = cpu_to_le32(from_kqid(&init_user_ns, dquot->dq_id)); |
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if (qtree_entry_unused(info, dp)) d->dqb_itime = cpu_to_le64(1); } static int v2r1_is_id(void *dp, struct dquot *dquot) |
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{ |
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struct v2r1_disk_dqblk *d = dp; |
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struct qtree_mem_dqinfo *info = |
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sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv; |
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if (qtree_entry_unused(info, dp)) |
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return 0; |
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return qid_eq(make_kqid(&init_user_ns, dquot->dq_id.type, le32_to_cpu(d->dqb_id)), dquot->dq_id); |
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} |
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static int v2_read_dquot(struct dquot *dquot) |
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{ |
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return qtree_read_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv, dquot); |
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} |
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static int v2_write_dquot(struct dquot *dquot) { |
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return qtree_write_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv, dquot); |
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} |
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static int v2_release_dquot(struct dquot *dquot) { |
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return qtree_release_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_id.type)->dqi_priv, dquot); |
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} static int v2_free_file_info(struct super_block *sb, int type) { kfree(sb_dqinfo(sb, type)->dqi_priv); return 0; |
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} |
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static int v2_get_next_id(struct super_block *sb, struct kqid *qid) { return qtree_get_next_id(sb_dqinfo(sb, qid->type)->dqi_priv, qid); } |
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static const struct quota_format_ops v2_format_ops = { |
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.check_quota_file = v2_check_quota_file, .read_file_info = v2_read_file_info, .write_file_info = v2_write_file_info, |
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.free_file_info = v2_free_file_info, |
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.read_dqblk = v2_read_dquot, .commit_dqblk = v2_write_dquot, .release_dqblk = v2_release_dquot, |
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.get_next_id = v2_get_next_id, |
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}; |
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static struct quota_format_type v2r0_quota_format = { |
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.qf_fmt_id = QFMT_VFS_V0, .qf_ops = &v2_format_ops, .qf_owner = THIS_MODULE }; |
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static struct quota_format_type v2r1_quota_format = { .qf_fmt_id = QFMT_VFS_V1, .qf_ops = &v2_format_ops, .qf_owner = THIS_MODULE }; |
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static int __init init_v2_quota_format(void) { |
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int ret; ret = register_quota_format(&v2r0_quota_format); if (ret) return ret; return register_quota_format(&v2r1_quota_format); |
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} static void __exit exit_v2_quota_format(void) { |
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unregister_quota_format(&v2r0_quota_format); unregister_quota_format(&v2r1_quota_format); |
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} module_init(init_v2_quota_format); module_exit(exit_v2_quota_format); |