X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=fs%2Fquota.c;h=db1cc9f3c7aa3a24be8439c632f77228e5e266ab;hb=04ba6e739e9c0623c25f94b191fd20dfbd1b26e3;hp=1df7832b4e087460876251bf7b70d79566264f1a;hpb=de69e5f44ecbf1d9faca4f473f4210473d26cd41;p=safe%2Fjmp%2Flinux-2.6 diff --git a/fs/quota.c b/fs/quota.c index 1df7832..db1cc9f 100644 --- a/fs/quota.c +++ b/fs/quota.c @@ -10,11 +10,14 @@ #include #include #include +#include #include -#include #include #include #include +#include +#include +#include /* Check validity of generic quotactl commands */ static int generic_quotactl_valid(struct super_block *sb, int type, int cmd, qid_t id) @@ -66,7 +69,6 @@ static int generic_quotactl_valid(struct super_block *sb, int type, int cmd, qid switch (cmd) { case Q_GETFMT: case Q_GETINFO: - case Q_QUOTAOFF: case Q_SETINFO: case Q_SETQUOTA: case Q_GETQUOTA: @@ -156,7 +158,6 @@ static int check_quotactl_valid(struct super_block *sb, int type, int cmd, qid_t static void quota_sync_sb(struct super_block *sb, int type) { int cnt; - struct inode *discard[MAXQUOTAS]; sb->s_qcop->quota_sync(sb, type); /* This is not very clever (and fast) but currently I don't know about @@ -166,29 +167,21 @@ static void quota_sync_sb(struct super_block *sb, int type) sb->s_op->sync_fs(sb, 1); sync_blockdev(sb->s_bdev); - /* Now when everything is written we can discard the pagecache so - * that userspace sees the changes. We need i_sem and so we could - * not do it inside dqonoff_sem. Moreover we need to be carefull - * about races with quotaoff() (that is the reason why we have own - * reference to inode). */ - down(&sb_dqopt(sb)->dqonoff_sem); + /* + * Now when everything is written we can discard the pagecache so + * that userspace sees the changes. + */ + mutex_lock(&sb_dqopt(sb)->dqonoff_mutex); for (cnt = 0; cnt < MAXQUOTAS; cnt++) { - discard[cnt] = NULL; if (type != -1 && cnt != type) continue; if (!sb_has_quota_enabled(sb, cnt)) continue; - discard[cnt] = igrab(sb_dqopt(sb)->files[cnt]); - } - up(&sb_dqopt(sb)->dqonoff_sem); - for (cnt = 0; cnt < MAXQUOTAS; cnt++) { - if (discard[cnt]) { - down(&discard[cnt]->i_sem); - truncate_inode_pages(&discard[cnt]->i_data, 0); - up(&discard[cnt]->i_sem); - iput(discard[cnt]); - } + mutex_lock_nested(&sb_dqopt(sb)->files[cnt]->i_mutex, I_MUTEX_QUOTA); + truncate_inode_pages(&sb_dqopt(sb)->files[cnt]->i_data, 0); + mutex_unlock(&sb_dqopt(sb)->files[cnt]->i_mutex); } + mutex_unlock(&sb_dqopt(sb)->dqonoff_mutex); } void sync_dquots(struct super_block *sb, int type) @@ -235,12 +228,12 @@ static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id, void if (IS_ERR(pathname = getname(addr))) return PTR_ERR(pathname); - ret = sb->s_qcop->quota_on(sb, type, id, pathname); + ret = sb->s_qcop->quota_on(sb, type, id, pathname, 0); putname(pathname); return ret; } case Q_QUOTAOFF: - return sb->s_qcop->quota_off(sb, type); + return sb->s_qcop->quota_off(sb, type, 0); case Q_GETFMT: { __u32 fmt; @@ -336,6 +329,34 @@ static int do_quotactl(struct super_block *sb, int type, int cmd, qid_t id, void } /* + * look up a superblock on which quota ops will be performed + * - use the name of a block device to find the superblock thereon + */ +static inline struct super_block *quotactl_block(const char __user *special) +{ +#ifdef CONFIG_BLOCK + struct block_device *bdev; + struct super_block *sb; + char *tmp = getname(special); + + if (IS_ERR(tmp)) + return ERR_CAST(tmp); + bdev = lookup_bdev(tmp); + putname(tmp); + if (IS_ERR(bdev)) + return ERR_CAST(bdev); + sb = get_super(bdev); + bdput(bdev); + if (!sb) + return ERR_PTR(-ENODEV); + + return sb; +#else + return ERR_PTR(-ENODEV); +#endif +} + +/* * This is the system call interface. This communicates with * the user-level programs. Currently this only supports diskquota * calls. Maybe we need to add the process quotas etc. in the future, @@ -345,25 +366,15 @@ asmlinkage long sys_quotactl(unsigned int cmd, const char __user *special, qid_t { uint cmds, type; struct super_block *sb = NULL; - struct block_device *bdev; - char *tmp; int ret; cmds = cmd >> SUBCMDSHIFT; type = cmd & SUBCMDMASK; if (cmds != Q_SYNC || special) { - tmp = getname(special); - if (IS_ERR(tmp)) - return PTR_ERR(tmp); - bdev = lookup_bdev(tmp); - putname(tmp); - if (IS_ERR(bdev)) - return PTR_ERR(bdev); - sb = get_super(bdev); - bdput(bdev); - if (!sb) - return -ENODEV; + sb = quotactl_block(special); + if (IS_ERR(sb)) + return PTR_ERR(sb); } ret = check_quotactl_valid(sb, type, cmds, id); @@ -374,3 +385,119 @@ asmlinkage long sys_quotactl(unsigned int cmd, const char __user *special, qid_t return ret; } + +#if defined(CONFIG_COMPAT_FOR_U64_ALIGNMENT) +/* + * This code works only for 32 bit quota tools over 64 bit OS (x86_64, ia64) + * and is necessary due to alignment problems. + */ +struct compat_if_dqblk { + compat_u64 dqb_bhardlimit; + compat_u64 dqb_bsoftlimit; + compat_u64 dqb_curspace; + compat_u64 dqb_ihardlimit; + compat_u64 dqb_isoftlimit; + compat_u64 dqb_curinodes; + compat_u64 dqb_btime; + compat_u64 dqb_itime; + compat_uint_t dqb_valid; +}; + +/* XFS structures */ +struct compat_fs_qfilestat { + compat_u64 dqb_bhardlimit; + compat_u64 qfs_nblks; + compat_uint_t qfs_nextents; +}; + +struct compat_fs_quota_stat { + __s8 qs_version; + __u16 qs_flags; + __s8 qs_pad; + struct compat_fs_qfilestat qs_uquota; + struct compat_fs_qfilestat qs_gquota; + compat_uint_t qs_incoredqs; + compat_int_t qs_btimelimit; + compat_int_t qs_itimelimit; + compat_int_t qs_rtbtimelimit; + __u16 qs_bwarnlimit; + __u16 qs_iwarnlimit; +}; + +asmlinkage long sys32_quotactl(unsigned int cmd, const char __user *special, + qid_t id, void __user *addr) +{ + unsigned int cmds; + struct if_dqblk __user *dqblk; + struct compat_if_dqblk __user *compat_dqblk; + struct fs_quota_stat __user *fsqstat; + struct compat_fs_quota_stat __user *compat_fsqstat; + compat_uint_t data; + u16 xdata; + long ret; + + cmds = cmd >> SUBCMDSHIFT; + + switch (cmds) { + case Q_GETQUOTA: + dqblk = compat_alloc_user_space(sizeof(struct if_dqblk)); + compat_dqblk = addr; + ret = sys_quotactl(cmd, special, id, dqblk); + if (ret) + break; + if (copy_in_user(compat_dqblk, dqblk, sizeof(*compat_dqblk)) || + get_user(data, &dqblk->dqb_valid) || + put_user(data, &compat_dqblk->dqb_valid)) + ret = -EFAULT; + break; + case Q_SETQUOTA: + dqblk = compat_alloc_user_space(sizeof(struct if_dqblk)); + compat_dqblk = addr; + ret = -EFAULT; + if (copy_in_user(dqblk, compat_dqblk, sizeof(*compat_dqblk)) || + get_user(data, &compat_dqblk->dqb_valid) || + put_user(data, &dqblk->dqb_valid)) + break; + ret = sys_quotactl(cmd, special, id, dqblk); + break; + case Q_XGETQSTAT: + fsqstat = compat_alloc_user_space(sizeof(struct fs_quota_stat)); + compat_fsqstat = addr; + ret = sys_quotactl(cmd, special, id, fsqstat); + if (ret) + break; + ret = -EFAULT; + /* Copying qs_version, qs_flags, qs_pad */ + if (copy_in_user(compat_fsqstat, fsqstat, + offsetof(struct compat_fs_quota_stat, qs_uquota))) + break; + /* Copying qs_uquota */ + if (copy_in_user(&compat_fsqstat->qs_uquota, + &fsqstat->qs_uquota, + sizeof(compat_fsqstat->qs_uquota)) || + get_user(data, &fsqstat->qs_uquota.qfs_nextents) || + put_user(data, &compat_fsqstat->qs_uquota.qfs_nextents)) + break; + /* Copying qs_gquota */ + if (copy_in_user(&compat_fsqstat->qs_gquota, + &fsqstat->qs_gquota, + sizeof(compat_fsqstat->qs_gquota)) || + get_user(data, &fsqstat->qs_gquota.qfs_nextents) || + put_user(data, &compat_fsqstat->qs_gquota.qfs_nextents)) + break; + /* Copying the rest */ + if (copy_in_user(&compat_fsqstat->qs_incoredqs, + &fsqstat->qs_incoredqs, + sizeof(struct compat_fs_quota_stat) - + offsetof(struct compat_fs_quota_stat, qs_incoredqs)) || + get_user(xdata, &fsqstat->qs_iwarnlimit) || + put_user(xdata, &compat_fsqstat->qs_iwarnlimit)) + break; + ret = 0; + break; + default: + ret = sys_quotactl(cmd, special, id, addr); + } + return ret; +} +#endif