From 884d179dff3aa98a73c3ba9dee05fd6050d664f0 Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Mon, 26 Jan 2009 15:28:09 +0100 Subject: quota: Move quota files into separate directory Quota subsystem has more and more files. It's time to create a dir for it. Signed-off-by: Jan Kara --- fs/quota/quota_v2.c | 236 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 236 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 000000000000..b618b563635c --- /dev/null +++ b/fs/quota/quota_v2.c @@ -0,0 +1,236 @@ +/* + * 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"); + +#define __QUOTA_V2_PARANOIA + +static void v2_mem2diskdqb(void *dp, struct dquot *dquot); +static void v2_disk2memdqb(struct dquot *dquot, void *dp); +static int v2_is_id(void *dp, struct dquot *dquot); + +static struct qtree_fmt_operations v2_qtree_ops = { + .mem2disk_dqblk = v2_mem2diskdqb, + .disk2mem_dqblk = v2_disk2memdqb, + .is_id = v2_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; +} + +/* 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; + ssize_t size; + static const uint quota_magics[] = V2_INITQMAGICS; + static const uint quota_versions[] = V2_INITQVERSIONS; + + size = sb->s_op->quota_read(sb, type, (char *)&dqhead, sizeof(struct v2_disk_dqheader), 0); + if (size != sizeof(struct v2_disk_dqheader)) { + printk("quota_v2: failed read expected=%zd got=%zd\n", + sizeof(struct v2_disk_dqheader), size); + 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 mem_dqinfo *info = sb_dqinfo(sb, type); + struct qtree_mem_dqinfo *qinfo; + ssize_t size; + + size = sb->s_op->quota_read(sb, type, (char *)&dinfo, + sizeof(struct v2_disk_dqinfo), V2_DQINFOOFF); + if (size != sizeof(struct v2_disk_dqinfo)) { + printk(KERN_WARNING "Can't read info structure on device %s.\n", + sb->s_id); + return -1; + } + 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.\n"); + return -1; + } + qinfo = info->dqi_priv; + /* limits are stored as unsigned 32-bit data */ + info->dqi_maxblimit = 0xffffffff; + info->dqi_maxilimit = 0xffffffff; + info->dqi_bgrace = le32_to_cpu(dinfo.dqi_bgrace); + info->dqi_igrace = le32_to_cpu(dinfo.dqi_igrace); + info->dqi_flags = le32_to_cpu(dinfo.dqi_flags); + 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); + qinfo->dqi_entry_size = sizeof(struct v2_disk_dqblk); + qinfo->dqi_ops = &v2_qtree_ops; + 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; + struct mem_dqinfo *info = sb_dqinfo(sb, type); + struct qtree_mem_dqinfo *qinfo = info->dqi_priv; + 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); + dinfo.dqi_flags = cpu_to_le32(info->dqi_flags & DQF_MASK); + 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); + if (size != sizeof(struct v2_disk_dqinfo)) { + printk(KERN_WARNING "Can't write info structure on device %s.\n", + sb->s_id); + return -1; + } + return 0; +} + +static void v2_disk2memdqb(struct dquot *dquot, void *dp) +{ + struct v2_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 v2_disk_dqblk)); + empty.dqb_itime = cpu_to_le64(1); + if (!memcmp(&empty, dp, sizeof(struct v2_disk_dqblk))) + m->dqb_itime = 0; +} + +static void v2_mem2diskdqb(void *dp, struct dquot *dquot) +{ + struct v2_disk_dqblk *d = dp; + struct mem_dqblk *m = &dquot->dq_dqb; + struct qtree_mem_dqinfo *info = + sb_dqinfo(dquot->dq_sb, dquot->dq_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(dquot->dq_id); + if (qtree_entry_unused(info, dp)) + d->dqb_itime = cpu_to_le64(1); +} + +static int v2_is_id(void *dp, struct dquot *dquot) +{ + struct v2_disk_dqblk *d = dp; + struct qtree_mem_dqinfo *info = + sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv; + + if (qtree_entry_unused(info, dp)) + return 0; + return le32_to_cpu(d->dqb_id) == dquot->dq_id; +} + +static int v2_read_dquot(struct dquot *dquot) +{ + return qtree_read_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv, dquot); +} + +static int v2_write_dquot(struct dquot *dquot) +{ + return qtree_write_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv, dquot); +} + +static int v2_release_dquot(struct dquot *dquot) +{ + return qtree_release_dquot(sb_dqinfo(dquot->dq_sb, dquot->dq_type)->dqi_priv, dquot); +} + +static int v2_free_file_info(struct super_block *sb, int type) +{ + kfree(sb_dqinfo(sb, type)->dqi_priv); + return 0; +} + +static 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, +}; + +static struct quota_format_type v2_quota_format = { + .qf_fmt_id = QFMT_VFS_V0, + .qf_ops = &v2_format_ops, + .qf_owner = THIS_MODULE +}; + +static int __init init_v2_quota_format(void) +{ + return register_quota_format(&v2_quota_format); +} + +static void __exit exit_v2_quota_format(void) +{ + unregister_quota_format(&v2_quota_format); +} + +module_init(init_v2_quota_format); +module_exit(exit_v2_quota_format); -- cgit v1.2.3