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bh=wqi/g8+nYJW5dWKPT/jj73GeiD/W48gxOqllJwPVhkQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DnaszmaIclWp+5FSgpgJBPZ34XcEbh1rtT+kCsF1JUv/PTDGJ3iBXfnojBzgEvuLj VbuDAXUUhRxRCw1qNxx8SMzBcNqR7nnZn6/cQxTWJL3saq80IPENaJcrKZD8YIw0Q0 k7vrHxK+jjU9xKvfMEpgqzbj7IiZft+DIO8ElCd6szPOnjnzEzSsQyoH7atFWzA4vD 6raCQta9Gqw8CnW6IUw07j0d207JKUBZ3BtlcMEC3Oiql/HUSf92fRBF2Vu+SNHAo7 gu/youuXGCb0JgjpRXj1C9KZqfRGSgNgT6ZfP7vwr9GDlNSuPF5Pg/VHGHG/nKekJI wQQbRzBgGc0Lg== From: cem@kernel.org To: hughd@google.com Cc: jack@suse.cz, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, djwong@kernel.org Subject: [PATCH 5/6] shmem: quota support Date: Mon, 3 Apr 2023 10:47:58 +0200 Message-Id: <20230403084759.884681-6-cem@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20230403084759.884681-1-cem@kernel.org> References: <20230403084759.884681-1-cem@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: D557518000B X-Stat-Signature: 9y7x9akf8my18ecwjgnkfmydw5ukrkzh X-HE-Tag: 1680511705-488447 X-HE-Meta: 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 GlQ5lVIT Sm6p63GNDi88x9KAKi/zs/Oa/HSBqaK9+JjbU5tgQOmSNmXYjwmNnEFA6uT+cCz/wea0LHTX3OZi8eFxMp6QbuL+9cDZIA90SgSULGpzjeYcxvSn0xvRLPyU+XwMJIBwo+Aksji/f2jBSkHMjpvOvNvtc/fBcKHf2Q+Q+LgEgJqFLWErlxy8vkeKjmihKQO5KGa91KB13S/agfeyS9tMnkY51tZnFA1x/z+VB5J6HtA6KsII= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Lukas Czerner Now the basic infra-structure is in place, enable quota support for tmpfs. Signed-off-by: Lukas Czerner Signed-off-by: Carlos Maiolino --- Documentation/filesystems/tmpfs.rst | 12 +++ include/linux/shmem_fs.h | 9 ++ mm/shmem.c | 162 ++++++++++++++++++++++++++-- 3 files changed, 174 insertions(+), 9 deletions(-) diff --git a/Documentation/filesystems/tmpfs.rst b/Documentation/filesystems/tmpfs.rst index 0408c245785e3..3f8d89bb7e1a5 100644 --- a/Documentation/filesystems/tmpfs.rst +++ b/Documentation/filesystems/tmpfs.rst @@ -86,6 +86,18 @@ use up all the memory on the machine; but enhances the scalability of that instance in a system with many CPUs making intensive use of it. +tmpfs also supports quota with the following mount options + +======== ============================================================= +quota User and group quota accounting and enforcement is enabled on + the mount. Tmpfs is using hidden system quota files that are + initialized on mount. +usrquota User quota accounting and enforcement is enabled on the + mount. +grpquota Group quota accounting and enforcement is enabled on the + mount. +======== ============================================================= + tmpfs has a mount option to set the NUMA memory allocation policy for all files in that instance (if CONFIG_NUMA is enabled) - which can be adjusted on the fly via 'mount -o remount ...' diff --git a/include/linux/shmem_fs.h b/include/linux/shmem_fs.h index cf38381bdb4c1..3e7e18726feb5 100644 --- a/include/linux/shmem_fs.h +++ b/include/linux/shmem_fs.h @@ -26,6 +26,9 @@ struct shmem_inode_info { atomic_t stop_eviction; /* hold when working on inode */ struct timespec64 i_crtime; /* file creation time */ unsigned int fsflags; /* flags for FS_IOC_[SG]ETFLAGS */ +#ifdef CONFIG_TMPFS_QUOTA + struct dquot *i_dquot[MAXQUOTAS]; +#endif struct inode vfs_inode; }; @@ -171,4 +174,10 @@ extern int shmem_mfill_atomic_pte(struct mm_struct *dst_mm, pmd_t *dst_pmd, #define SHMEM_QUOTA_MAX_SPC_LIMIT 0x7fffffffffffffffLL /* 2^63-1 */ #define SHMEM_QUOTA_MAX_INO_LIMIT 0x7fffffffffffffffLL +#ifdef CONFIG_TMPFS_QUOTA +#define SHMEM_MAXQUOTAS 2 +extern const struct dquot_operations shmem_quota_operations; +extern struct quota_format_type shmem_quota_format; +#endif /* CONFIG_TMPFS_QUOTA */ + #endif diff --git a/mm/shmem.c b/mm/shmem.c index 88e13930fc013..d7529c883eaf5 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -79,6 +79,7 @@ static struct vfsmount *shm_mnt; #include #include #include +#include #include @@ -116,10 +117,12 @@ struct shmem_options { bool full_inums; int huge; int seen; + unsigned short quota_types; #define SHMEM_SEEN_BLOCKS 1 #define SHMEM_SEEN_INODES 2 #define SHMEM_SEEN_HUGE 4 #define SHMEM_SEEN_INUMS 8 +#define SHMEM_SEEN_QUOTA 16 }; #ifdef CONFIG_TMPFS @@ -211,8 +214,11 @@ static inline int shmem_inode_acct_block(struct inode *inode, long pages) if (percpu_counter_compare(&sbinfo->used_blocks, sbinfo->max_blocks - pages) > 0) goto unacct; + if ((err = dquot_alloc_block_nodirty(inode, pages)) != 0) + goto unacct; percpu_counter_add(&sbinfo->used_blocks, pages); - } + } else if ((err = dquot_alloc_block_nodirty(inode, pages)) != 0) + goto unacct; return 0; @@ -226,6 +232,8 @@ static inline void shmem_inode_unacct_blocks(struct inode *inode, long pages) struct shmem_inode_info *info = SHMEM_I(inode); struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb); + dquot_free_block_nodirty(inode, pages); + if (sbinfo->max_blocks) percpu_counter_sub(&sbinfo->used_blocks, pages); shmem_unacct_blocks(info->flags, pages); @@ -254,6 +262,47 @@ bool vma_is_shmem(struct vm_area_struct *vma) static LIST_HEAD(shmem_swaplist); static DEFINE_MUTEX(shmem_swaplist_mutex); +#ifdef CONFIG_TMPFS_QUOTA + +static int shmem_enable_quotas(struct super_block *sb, + unsigned short quota_types) +{ + int type, err = 0; + + sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NOLIST_DIRTY; + for (type = 0; type < SHMEM_MAXQUOTAS; type++) { + if (!(quota_types & (1 << type))) + continue; + err = dquot_load_quota_sb(sb, type, QFMT_SHMEM, + DQUOT_USAGE_ENABLED | + DQUOT_LIMITS_ENABLED); + if (err) + goto out_err; + } + return 0; + +out_err: + pr_warn("tmpfs: failed to enable quota tracking (type=%d, err=%d)\n", + type, err); + for (type--; type >= 0; type--) + dquot_quota_off(sb, type); + return err; +} + +static void shmem_disable_quotas(struct super_block *sb) +{ + int type; + + for (type = 0; type < SHMEM_MAXQUOTAS; type++) + dquot_quota_off(sb, type); +} + +static struct dquot **shmem_get_dquots(struct inode *inode) +{ + return SHMEM_I(inode)->i_dquot; +} +#endif /* CONFIG_TMPFS_QUOTA */ + /* * shmem_reserve_inode() performs bookkeeping to reserve a shmem inode, and * produces a novel ino for the newly allocated inode. @@ -360,7 +409,6 @@ static void shmem_recalc_inode(struct inode *inode) freed = info->alloced - info->swapped - inode->i_mapping->nrpages; if (freed > 0) { info->alloced -= freed; - inode->i_blocks -= freed * BLOCKS_PER_PAGE; shmem_inode_unacct_blocks(inode, freed); } } @@ -378,7 +426,6 @@ bool shmem_charge(struct inode *inode, long pages) spin_lock_irqsave(&info->lock, flags); info->alloced += pages; - inode->i_blocks += pages * BLOCKS_PER_PAGE; shmem_recalc_inode(inode); spin_unlock_irqrestore(&info->lock, flags); @@ -394,7 +441,6 @@ void shmem_uncharge(struct inode *inode, long pages) spin_lock_irqsave(&info->lock, flags); info->alloced -= pages; - inode->i_blocks -= pages * BLOCKS_PER_PAGE; shmem_recalc_inode(inode); spin_unlock_irqrestore(&info->lock, flags); @@ -1133,6 +1179,15 @@ static int shmem_setattr(struct mnt_idmap *idmap, } } + /* Transfer quota accounting */ + if (i_uid_needs_update(idmap, attr, inode) || + i_gid_needs_update(idmap, attr,inode)) { + error = dquot_transfer(idmap, inode, attr); + + if (error) + return error; + } + setattr_copy(idmap, inode, attr); if (attr->ia_valid & ATTR_MODE) error = posix_acl_chmod(idmap, dentry, inode->i_mode); @@ -1178,7 +1233,9 @@ static void shmem_evict_inode(struct inode *inode) simple_xattrs_free(&info->xattrs); WARN_ON(inode->i_blocks); shmem_free_inode(inode->i_sb); + dquot_free_inode(inode); clear_inode(inode); + dquot_drop(inode); } static int shmem_find_swap_entries(struct address_space *mapping, @@ -1975,7 +2032,6 @@ static int shmem_get_folio_gfp(struct inode *inode, pgoff_t index, spin_lock_irq(&info->lock); info->alloced += folio_nr_pages(folio); - inode->i_blocks += (blkcnt_t)BLOCKS_PER_PAGE << folio_order(folio); shmem_recalc_inode(inode); spin_unlock_irq(&info->lock); alloced = true; @@ -2346,9 +2402,10 @@ static void shmem_set_inode_flags(struct inode *inode, unsigned int fsflags) #define shmem_initxattrs NULL #endif -static struct inode *shmem_get_inode(struct mnt_idmap *idmap, struct super_block *sb, - struct inode *dir, umode_t mode, dev_t dev, - unsigned long flags) +static struct inode *shmem_get_inode_noquota(struct mnt_idmap *idmap, + struct super_block *sb, + struct inode *dir, umode_t mode, + dev_t dev, unsigned long flags) { struct inode *inode; struct shmem_inode_info *info; @@ -2422,6 +2479,37 @@ static struct inode *shmem_get_inode(struct mnt_idmap *idmap, struct super_block return inode; } +static struct inode *shmem_get_inode(struct mnt_idmap *idmap, + struct super_block *sb, struct inode *dir, + umode_t mode, dev_t dev, unsigned long flags) +{ + int err; + struct inode *inode; + + inode = shmem_get_inode_noquota(idmap, sb, dir, mode, dev, flags); + if (IS_ERR(inode)) + return inode; + + err = dquot_initialize(inode); + if (err) + goto errout; + + err = dquot_alloc_inode(inode); + if (err) { + dquot_drop(inode); + goto errout; + } + return inode; + +errout: + inode->i_flags |= S_NOQUOTA; + iput(inode); + shmem_free_inode(sb); + if (err) + return ERR_PTR(err); + return NULL; +} + #ifdef CONFIG_USERFAULTFD int shmem_mfill_atomic_pte(struct mm_struct *dst_mm, pmd_t *dst_pmd, @@ -2525,7 +2613,6 @@ int shmem_mfill_atomic_pte(struct mm_struct *dst_mm, spin_lock_irq(&info->lock); info->alloced++; - inode->i_blocks += BLOCKS_PER_PAGE; shmem_recalc_inode(inode); spin_unlock_irq(&info->lock); @@ -3372,6 +3459,7 @@ static ssize_t shmem_listxattr(struct dentry *dentry, char *buffer, size_t size) static const struct inode_operations shmem_short_symlink_operations = { .getattr = shmem_getattr, + .setattr = shmem_setattr, .get_link = simple_get_link, #ifdef CONFIG_TMPFS_XATTR .listxattr = shmem_listxattr, @@ -3380,6 +3468,7 @@ static const struct inode_operations shmem_short_symlink_operations = { static const struct inode_operations shmem_symlink_inode_operations = { .getattr = shmem_getattr, + .setattr = shmem_setattr, .get_link = shmem_get_link, #ifdef CONFIG_TMPFS_XATTR .listxattr = shmem_listxattr, @@ -3478,6 +3567,9 @@ enum shmem_param { Opt_uid, Opt_inode32, Opt_inode64, + Opt_quota, + Opt_usrquota, + Opt_grpquota, }; static const struct constant_table shmem_param_enums_huge[] = { @@ -3499,6 +3591,11 @@ const struct fs_parameter_spec shmem_fs_parameters[] = { fsparam_u32 ("uid", Opt_uid), fsparam_flag ("inode32", Opt_inode32), fsparam_flag ("inode64", Opt_inode64), +#ifdef CONFIG_TMPFS_QUOTA + fsparam_flag ("quota", Opt_quota), + fsparam_flag ("usrquota", Opt_usrquota), + fsparam_flag ("grpquota", Opt_grpquota), +#endif {} }; @@ -3582,6 +3679,18 @@ static int shmem_parse_one(struct fs_context *fc, struct fs_parameter *param) ctx->full_inums = true; ctx->seen |= SHMEM_SEEN_INUMS; break; + case Opt_quota: + ctx->seen |= SHMEM_SEEN_QUOTA; + ctx->quota_types |= (QTYPE_MASK_USR | QTYPE_MASK_GRP); + break; + case Opt_usrquota: + ctx->seen |= SHMEM_SEEN_QUOTA; + ctx->quota_types |= QTYPE_MASK_USR; + break; + case Opt_grpquota: + ctx->seen |= SHMEM_SEEN_QUOTA; + ctx->quota_types |= QTYPE_MASK_GRP; + break; } return 0; @@ -3681,6 +3790,12 @@ static int shmem_reconfigure(struct fs_context *fc) goto out; } + if (ctx->seen & SHMEM_SEEN_QUOTA && + !sb_any_quota_loaded(fc->root->d_sb)) { + err = "Cannot enable quota on remount"; + goto out; + } + if (ctx->seen & SHMEM_SEEN_HUGE) sbinfo->huge = ctx->huge; if (ctx->seen & SHMEM_SEEN_INUMS) @@ -3763,6 +3878,9 @@ static void shmem_put_super(struct super_block *sb) { struct shmem_sb_info *sbinfo = SHMEM_SB(sb); +#ifdef CONFIG_TMPFS_QUOTA + shmem_disable_quotas(sb); +#endif free_percpu(sbinfo->ino_batch); percpu_counter_destroy(&sbinfo->used_blocks); mpol_put(sbinfo->mpol); @@ -3841,6 +3959,17 @@ static int shmem_fill_super(struct super_block *sb, struct fs_context *fc) #endif uuid_gen(&sb->s_uuid); +#ifdef CONFIG_TMPFS_QUOTA + if (ctx->seen & SHMEM_SEEN_QUOTA) { + sb->dq_op = &shmem_quota_operations; + sb->s_qcop = &dquot_quotactl_sysfile_ops; + sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; + + if (shmem_enable_quotas(sb, ctx->quota_types)) + goto failed; + } +#endif /* CONFIG_TMPFS_QUOTA */ + inode = shmem_get_inode(&nop_mnt_idmap, sb, NULL, S_IFDIR | sbinfo->mode, 0, VM_NORESERVE); if (IS_ERR(inode)) { @@ -4016,6 +4145,9 @@ static const struct super_operations shmem_ops = { #ifdef CONFIG_TMPFS .statfs = shmem_statfs, .show_options = shmem_show_options, +#endif +#ifdef CONFIG_TMPFS_QUOTA + .get_dquots = shmem_get_dquots, #endif .evict_inode = shmem_evict_inode, .drop_inode = generic_delete_inode, @@ -4082,6 +4214,14 @@ void __init shmem_init(void) shmem_init_inodecache(); +#ifdef CONFIG_TMPFS_QUOTA + error = register_quota_format(&shmem_quota_format); + if (error < 0) { + pr_err("Could not register quota format\n"); + goto out3; + } +#endif + error = register_filesystem(&shmem_fs_type); if (error) { pr_err("Could not register tmpfs\n"); @@ -4106,6 +4246,10 @@ void __init shmem_init(void) out1: unregister_filesystem(&shmem_fs_type); out2: +#ifdef CONFIG_TMPFS_QUOTA + unregister_quota_format(&shmem_quota_format); +#endif +out3: shmem_destroy_inodecache(); shm_mnt = ERR_PTR(error); } -- 2.30.2