From e6e268cb682290da29e3c8408493a4474307b8cc Mon Sep 17 00:00:00 2001 From: Lukas Czerner Date: Wed, 27 Oct 2021 16:18:50 +0200 Subject: [PATCH] ext4: move quota configuration out of handle_mount_opt() At the parsing phase of mount in the new mount api sb will not be available so move quota confiquration out of handle_mount_opt() by noting the quota file names in the ext4_fs_context structure to be able to apply it later. Signed-off-by: Lukas Czerner Reviewed-by: Carlos Maiolino Link: https://lore.kernel.org/r/20211027141857.33657-7-lczerner@redhat.com Signed-off-by: Theodore Ts'o --- fs/ext4/super.c | 258 +++++++++++++++++++++++++++++++----------------- 1 file changed, 165 insertions(+), 93 deletions(-) diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 877eaca99355..c082aead0e33 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -89,6 +89,10 @@ static void ext4_clear_request_list(void); static struct inode *ext4_get_journal_inode(struct super_block *sb, unsigned int journal_inum); static int ext4_validate_options(struct fs_context *fc); +static int ext4_check_quota_consistency(struct fs_context *fc, + struct super_block *sb); +static void ext4_apply_quota_options(struct fs_context *fc, + struct super_block *sb); /* * Lock ordering @@ -1986,71 +1990,6 @@ static const char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n" "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n"; -#ifdef CONFIG_QUOTA -static int set_qf_name(struct super_block *sb, int qtype, - struct fs_parameter *param) -{ - struct ext4_sb_info *sbi = EXT4_SB(sb); - char *qname, *old_qname = get_qf_name(sb, sbi, qtype); - int ret = -1; - - if (sb_any_quota_loaded(sb) && !old_qname) { - ext4_msg(sb, KERN_ERR, - "Cannot change journaled " - "quota options when quota turned on"); - return -1; - } - if (ext4_has_feature_quota(sb)) { - ext4_msg(sb, KERN_INFO, "Journaled quota options " - "ignored when QUOTA feature is enabled"); - return 1; - } - qname = kmemdup_nul(param->string, param->size, GFP_KERNEL); - if (!qname) { - ext4_msg(sb, KERN_ERR, - "Not enough memory for storing quotafile name"); - return -1; - } - if (old_qname) { - if (strcmp(old_qname, qname) == 0) - ret = 1; - else - ext4_msg(sb, KERN_ERR, - "%s quota file already specified", - QTYPE2NAME(qtype)); - goto errout; - } - if (strchr(qname, '/')) { - ext4_msg(sb, KERN_ERR, - "quotafile must be on filesystem root"); - goto errout; - } - rcu_assign_pointer(sbi->s_qf_names[qtype], qname); - set_opt(sb, QUOTA); - return 1; -errout: - kfree(qname); - return ret; -} - -static int clear_qf_name(struct super_block *sb, int qtype) -{ - - struct ext4_sb_info *sbi = EXT4_SB(sb); - char *old_qname = get_qf_name(sb, sbi, qtype); - - if (sb_any_quota_loaded(sb) && old_qname) { - ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options" - " when quota turned on"); - return -1; - } - rcu_assign_pointer(sbi->s_qf_names[qtype], NULL); - synchronize_rcu(); - kfree(old_qname); - return 1; -} -#endif - #define MOPT_SET 0x0001 #define MOPT_CLEAR 0x0002 #define MOPT_NOSUPPORT 0x0004 @@ -2254,11 +2193,70 @@ static int ext4_set_test_dummy_encryption(struct super_block *sb, } struct ext4_fs_context { - unsigned long journal_devnum; - unsigned int journal_ioprio; - int mb_optimize_scan; + char *s_qf_names[EXT4_MAXQUOTAS]; + int s_jquota_fmt; /* Format of quota to use */ + unsigned short qname_spec; + unsigned long journal_devnum; + unsigned int journal_ioprio; + int mb_optimize_scan; }; +#ifdef CONFIG_QUOTA +/* + * Note the name of the specified quota file. + */ +static int note_qf_name(struct fs_context *fc, int qtype, + struct fs_parameter *param) +{ + struct ext4_fs_context *ctx = fc->fs_private; + char *qname; + + if (param->size < 1) { + ext4_msg(NULL, KERN_ERR, "Missing quota name"); + return -EINVAL; + } + if (strchr(param->string, '/')) { + ext4_msg(NULL, KERN_ERR, + "quotafile must be on filesystem root"); + return -EINVAL; + } + if (ctx->s_qf_names[qtype]) { + if (strcmp(ctx->s_qf_names[qtype], param->string) != 0) { + ext4_msg(NULL, KERN_ERR, + "%s quota file already specified", + QTYPE2NAME(qtype)); + return -EINVAL; + } + return 0; + } + + qname = kmemdup_nul(param->string, param->size, GFP_KERNEL); + if (!qname) { + ext4_msg(NULL, KERN_ERR, + "Not enough memory for storing quotafile name"); + return -ENOMEM; + } + ctx->s_qf_names[qtype] = qname; + ctx->qname_spec |= 1 << qtype; + return 0; +} + +/* + * Clear the name of the specified quota file. + */ +static int unnote_qf_name(struct fs_context *fc, int qtype) +{ + struct ext4_fs_context *ctx = fc->fs_private; + + if (ctx->s_qf_names[qtype]) + kfree(ctx->s_qf_names[qtype]); + + ctx->s_qf_names[qtype] = NULL; + ctx->qname_spec |= 1 << qtype; + return 0; +} +#endif + static int handle_mount_opt(struct fs_context *fc, struct fs_parameter *param) { struct ext4_fs_context *ctx = fc->fs_private; @@ -2279,14 +2277,14 @@ static int handle_mount_opt(struct fs_context *fc, struct fs_parameter *param) #ifdef CONFIG_QUOTA if (token == Opt_usrjquota) { if (!*param->string) - return clear_qf_name(sb, USRQUOTA); + return unnote_qf_name(fc, USRQUOTA); else - return set_qf_name(sb, USRQUOTA, param); + return note_qf_name(fc, USRQUOTA, param); } else if (token == Opt_grpjquota) { if (!*param->string) - return clear_qf_name(sb, GRPQUOTA); + return unnote_qf_name(fc, GRPQUOTA); else - return set_qf_name(sb, GRPQUOTA, param); + return note_qf_name(fc, GRPQUOTA, param); } #endif switch (token) { @@ -2360,11 +2358,6 @@ static int handle_mount_opt(struct fs_context *fc, struct fs_parameter *param) } if (m->flags & MOPT_CLEAR_ERR) clear_opt(sb, ERRORS_MASK); - if (token == Opt_noquota && sb_any_quota_loaded(sb)) { - ext4_msg(NULL, KERN_ERR, "Cannot change quota " - "options when quota turned on"); - return -EINVAL; - } if (m->flags & MOPT_NOSUPPORT) { ext4_msg(NULL, KERN_ERR, "%s option not supported", @@ -2486,19 +2479,7 @@ static int handle_mount_opt(struct fs_context *fc, struct fs_parameter *param) } #ifdef CONFIG_QUOTA } else if (m->flags & MOPT_QFMT) { - if (sb_any_quota_loaded(sb) && - sbi->s_jquota_fmt != m->mount_opt) { - ext4_msg(NULL, KERN_ERR, "Cannot change journaled " - "quota options when quota turned on"); - return -EINVAL; - } - if (ext4_has_feature_quota(sb)) { - ext4_msg(NULL, KERN_INFO, - "Quota format mount options ignored " - "when QUOTA feature is enabled"); - return 1; - } - sbi->s_jquota_fmt = m->mount_opt; + ctx->s_jquota_fmt = m->mount_opt; #endif } else if (token == Opt_dax || token == Opt_dax_always || token == Opt_dax_inode || token == Opt_dax_never) { @@ -2595,7 +2576,7 @@ static int handle_mount_opt(struct fs_context *fc, struct fs_parameter *param) } static int parse_options(char *options, struct super_block *sb, - struct ext4_fs_context *ret_opts, + struct ext4_fs_context *ctx, int is_remount) { struct fs_parameter param; @@ -2607,7 +2588,7 @@ static int parse_options(char *options, struct super_block *sb, return 1; memset(&fc, 0, sizeof(fc)); - fc.fs_private = ret_opts; + fc.fs_private = ctx; fc.s_fs_info = EXT4_SB(sb); if (is_remount) @@ -2649,9 +2630,100 @@ static int parse_options(char *options, struct super_block *sb, if (ret < 0) return 0; + ret = ext4_check_quota_consistency(&fc, sb); + if (ret < 0) + return 0; + + if (ctx->qname_spec) + ext4_apply_quota_options(&fc, sb); + return 1; } +static void ext4_apply_quota_options(struct fs_context *fc, + struct super_block *sb) +{ +#ifdef CONFIG_QUOTA + struct ext4_fs_context *ctx = fc->fs_private; + struct ext4_sb_info *sbi = EXT4_SB(sb); + char *qname; + int i; + + for (i = 0; i < EXT4_MAXQUOTAS; i++) { + if (!(ctx->qname_spec & (1 << i))) + continue; + qname = ctx->s_qf_names[i]; /* May be NULL */ + ctx->s_qf_names[i] = NULL; + kfree(sbi->s_qf_names[i]); + rcu_assign_pointer(sbi->s_qf_names[i], qname); + set_opt(sb, QUOTA); + } +#endif +} + +/* + * Check quota settings consistency. + */ +static int ext4_check_quota_consistency(struct fs_context *fc, + struct super_block *sb) +{ +#ifdef CONFIG_QUOTA + struct ext4_fs_context *ctx = fc->fs_private; + struct ext4_sb_info *sbi = EXT4_SB(sb); + bool quota_feature = ext4_has_feature_quota(sb); + bool quota_loaded = sb_any_quota_loaded(sb); + int i; + + if (ctx->qname_spec && quota_loaded) { + if (quota_feature) + goto err_feature; + + for (i = 0; i < EXT4_MAXQUOTAS; i++) { + if (!(ctx->qname_spec & (1 << i))) + continue; + + if (!!sbi->s_qf_names[i] != !!ctx->s_qf_names[i]) + goto err_jquota_change; + + if (sbi->s_qf_names[i] && ctx->s_qf_names[i] && + strcmp(sbi->s_qf_names[i], + ctx->s_qf_names[i]) != 0) + goto err_jquota_specified; + } + } + + if (ctx->s_jquota_fmt) { + if (sbi->s_jquota_fmt != ctx->s_jquota_fmt && quota_loaded) + goto err_quota_change; + if (quota_feature) { + ext4_msg(NULL, KERN_INFO, "Quota format mount options " + "ignored when QUOTA feature is enabled"); + return 0; + } + } + return 0; + +err_quota_change: + ext4_msg(NULL, KERN_ERR, + "Cannot change quota options when quota turned on"); + return -EINVAL; +err_jquota_change: + ext4_msg(NULL, KERN_ERR, "Cannot change journaled quota " + "options when quota turned on"); + return -EINVAL; +err_jquota_specified: + ext4_msg(NULL, KERN_ERR, "%s quota file already specified", + QTYPE2NAME(i)); + return -EINVAL; +err_feature: + ext4_msg(NULL, KERN_ERR, "Journaled quota options ignored " + "when QUOTA feature is enabled"); + return 0; +#else + return 0; +#endif +} + static int ext4_validate_options(struct fs_context *fc) { struct ext4_sb_info *sbi = fc->s_fs_info; @@ -4105,7 +4177,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) __u64 blocks_count; int err = 0; ext4_group_t first_not_zeroed; - struct ext4_fs_context parsed_opts; + struct ext4_fs_context parsed_opts = {0}; /* Set defaults for the variables that will be set during parsing */ parsed_opts.journal_ioprio = DEFAULT_JOURNAL_IOPRIO;