| Message ID | 20221108133010.75226-2-lczerner@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | shmem: user and group quota support for tmpfs | expand |
On Tue, Nov 08, 2022 at 02:30:09PM +0100, Lukas Czerner wrote: > Implement user and group quota support for tmpfs using system quota file > in vfsv0 quota format. Because everything in tmpfs is temporary and as a > result is lost on umount, the quota files are initialized on every > mount. This also goes for quota limits, that needs to be set up after > every mount. > > The quota support in tmpfs is well separated from the rest of the > filesystem and is only enabled using mount option -o quota (and > usrquota and grpquota for compatibility reasons). Only quota accounting > is enabled this way, enforcement needs to be enable by regular quota > tools (using Q_QUOTAON ioctl). > > Signed-off-by: Lukas Czerner <lczerner@redhat.com> > --- > Documentation/filesystems/tmpfs.rst | 12 + > include/linux/shmem_fs.h | 3 + > mm/shmem.c | 361 ++++++++++++++++++++++++++-- > 3 files changed, 353 insertions(+), 23 deletions(-) > > diff --git a/Documentation/filesystems/tmpfs.rst b/Documentation/filesystems/tmpfs.rst > index 0408c245785e..9c4f228ef4f3 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 Quota accounting is enabled on the mount. Tmpfs is using > + hidden system quota files that are initialized on mount. > + Quota limits can quota enforcement can be enabled using > + standard quota tools. > +usrquota Same as quota option. Exists for compatibility reasons. > +grpquota Same as quota option. Exists for compatibility reasons. I guess this is following ext* where group and user quota cannot be enabled individually, nor is there a 'noenforce' mode? Not complaining here, since it /does/ cut down on the number of mount options. :) > +======== ============================================================= > + > + > 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 d500ea967dc7..02a328c98d3a 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_QUOTA > + struct dquot *i_dquot[MAXQUOTAS]; > +#endif > struct inode vfs_inode; > }; > > diff --git a/mm/shmem.c b/mm/shmem.c > index c1d8b8a1aa3b..ec16659c2255 100644 > --- a/mm/shmem.c > +++ b/mm/shmem.c > @@ -79,6 +79,12 @@ static struct vfsmount *shm_mnt; > #include <linux/userfaultfd_k.h> > #include <linux/rmap.h> > #include <linux/uuid.h> > +#include <linux/quotaops.h> > +/* > + * Required for structures definitions and macros for quote file > + * initialization. > + */ > +#include <../fs/quota/quotaio_v2.h> > > #include <linux/uaccess.h> > > @@ -120,8 +126,13 @@ struct shmem_options { > #define SHMEM_SEEN_INODES 2 > #define SHMEM_SEEN_HUGE 4 > #define SHMEM_SEEN_INUMS 8 > +#define SHMEM_SEEN_QUOTA 16 > }; > > +static void shmem_set_inode_flags(struct inode *, unsigned int); > +static struct inode *shmem_get_inode_noquota(struct super_block *, > + struct inode *, umode_t, dev_t, unsigned long); > + > #ifdef CONFIG_TMPFS > static unsigned long shmem_default_max_blocks(void) > { > @@ -136,6 +147,10 @@ static unsigned long shmem_default_max_inodes(void) > } > #endif > > +#if defined(CONFIG_TMPFS) && defined(CONFIG_QUOTA) > +#define SHMEM_QUOTA_TMPFS > +#endif > + > static int shmem_swapin_folio(struct inode *inode, pgoff_t index, > struct folio **foliop, enum sgp_type sgp, > gfp_t gfp, struct vm_area_struct *vma, > @@ -198,26 +213,34 @@ static inline void shmem_unacct_blocks(unsigned long flags, long pages) > vm_unacct_memory(pages * VM_ACCT(PAGE_SIZE)); > } > > -static inline bool shmem_inode_acct_block(struct inode *inode, long pages) > +static inline int shmem_inode_acct_block(struct inode *inode, long pages) > { > struct shmem_inode_info *info = SHMEM_I(inode); > struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb); > + int err = -ENOSPC; > > if (shmem_acct_block(info->flags, pages)) > - return false; > + return err; > > if (sbinfo->max_blocks) { > if (percpu_counter_compare(&sbinfo->used_blocks, > sbinfo->max_blocks - pages) > 0) > goto unacct; > + if (dquot_alloc_block_nodirty(inode, pages)) { > + err = -EDQUOT; > + goto unacct; > + } > percpu_counter_add(&sbinfo->used_blocks, pages); > + } else if (dquot_alloc_block_nodirty(inode, pages)) { > + err = -EDQUOT; > + goto unacct; > } > > - return true; > + return 0; > > unacct: > shmem_unacct_blocks(info->flags, pages); > - return false; > + return err; > } > > static inline void shmem_inode_unacct_blocks(struct inode *inode, long pages) > @@ -225,6 +248,8 @@ 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); > @@ -247,6 +272,218 @@ bool vma_is_shmem(struct vm_area_struct *vma) > static LIST_HEAD(shmem_swaplist); > static DEFINE_MUTEX(shmem_swaplist_mutex); > > +#ifdef SHMEM_QUOTA_TMPFS > + > +#define SHMEM_MAXQUOTAS 2 > + > +/* > + * Define macros needed for quota file initialization. > + */ > +#define MAX_IQ_TIME 604800 /* (7*24*60*60) 1 week */ > +#define MAX_DQ_TIME 604800 /* (7*24*60*60) 1 week */ > +#define QT_TREEOFF 1 /* Offset of tree in file in blocks */ > +#define QUOTABLOCK_BITS 10 > +#define QUOTABLOCK_SIZE (1 << QUOTABLOCK_BITS) > + > +static ssize_t shmem_quota_write_inode(struct inode *inode, int type, > + const char *data, size_t len, loff_t off) > +{ > + loff_t i_size = i_size_read(inode); > + struct page *page = NULL; > + unsigned long offset; > + struct folio *folio; > + int err = 0; > + pgoff_t index; > + > + index = off >> PAGE_SHIFT; > + offset = off & ~PAGE_MASK; > + > + /* > + * We expect the write to fit into a single page > + */ > + if (PAGE_SIZE - offset < len) { > + pr_warn("tmpfs: quota write (off=%llu, len=%llu) doesn't fit into a single page\n", > + (unsigned long long)off, (unsigned long long)len); > + return -EIO; > + } > + > + err = shmem_get_folio(inode, index, &folio, SGP_WRITE); > + if (err) > + return err; > + > + page = folio_file_page(folio, index); > + if (PageHWPoison(page)) { > + folio_unlock(folio); > + folio_put(folio); > + return -EIO; > + } > + > + /* Write data, or zeroout the portion of the page */ > + if (data) > + memcpy(page_address(page) + offset, data, len); > + else > + memset(page_address(page) + offset, 0, len); > + > + SetPageUptodate(page); Don't we need to mark the /folio/ uptodate here? Or at least the head page if the quota file got a THP? Hm. shmem_write_end will SetPageUptodate on the head page if it's a compound page, but it'll set_page_dirty to mark the whole folio dirty. Now I'm confused completely. :( OTOH I guess these are quota files, perhaps they simply don't need THP anyway? > + flush_dcache_folio(folio); > + folio_mark_dirty(folio); > + folio_unlock(folio); > + folio_put(folio); > + > + if (i_size < off + len) > + i_size_write(inode, off + len); > + return err ? err : len; > +} > + > +static ssize_t shmem_quota_write(struct super_block *sb, int type, > + const char *data, size_t len, loff_t off) > +{ > + struct inode *inode = sb_dqopt(sb)->files[type]; > + > + return shmem_quota_write_inode(inode, type, data, len, off); > +} > + > +static int shmem_enable_quotas(struct super_block *sb) > +{ > + int type, err = 0; > + struct inode *inode; > + struct v2_disk_dqheader qheader; > + struct v2_disk_dqinfo qinfo; > + static const uint quota_magics[] = V2_INITQMAGICS; > + static const uint quota_versions[] = V2_INITQVERSIONS; > + > + sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NOLIST_DIRTY; > + for (type = 0; type < SHMEM_MAXQUOTAS; type++) { > + inode = shmem_get_inode_noquota(sb, NULL, S_IFREG | 0777, 0, > + VM_NORESERVE); > + if (IS_ERR_OR_NULL(inode)) { > + err = PTR_ERR(inode); > + goto out_err; > + } > + inode->i_flags |= S_NOQUOTA; > + > + /* Initialize generic quota file header */ > + qheader.dqh_magic = cpu_to_le32(quota_magics[type]); > + qheader.dqh_version = cpu_to_le32(quota_versions[type]); > + > + /* Initialize the quota file info structure */ > + qinfo.dqi_bgrace = cpu_to_le32(MAX_DQ_TIME); > + qinfo.dqi_igrace = cpu_to_le32(MAX_IQ_TIME); > + qinfo.dqi_flags = cpu_to_le32(0); > + qinfo.dqi_blocks = cpu_to_le32(QT_TREEOFF + 1); > + qinfo.dqi_free_blk = cpu_to_le32(0); > + qinfo.dqi_free_entry = cpu_to_le32(0); > + > + /* > + * Write out generic quota header, quota info structure and > + * zeroout first tree block. > + */ > + shmem_quota_write_inode(inode, type, (const char *)&qheader, > + sizeof(qheader), 0); Why is it not important to check error returns here? > + shmem_quota_write_inode(inode, type, (const char *)&qinfo, > + sizeof(qinfo), sizeof(qheader)); > + shmem_quota_write_inode(inode, type, 0, > + QT_TREEOFF * QUOTABLOCK_SIZE, > + QUOTABLOCK_SIZE); > + > + shmem_set_inode_flags(inode, FS_NOATIME_FL | FS_IMMUTABLE_FL); > + > + err = dquot_load_quota_inode(inode, type, QFMT_VFS_V1, I wonder, what's the difference between quota v1 and v2? Wouldn't we want the newer version? > + DQUOT_USAGE_ENABLED); > + iput(inode); > + 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--) { > + inode = sb_dqopt(sb)->files[type]; > + if (inode) > + inode = igrab(inode); > + dquot_quota_off(sb, type); > + if (inode) > + iput(inode); > + } > + return err; > +} > + > +static void shmem_disable_quotas(struct super_block *sb) > +{ > + struct inode *inode = NULL; > + int type; > + > + for (type = 0; type < SHMEM_MAXQUOTAS; type++) { > + inode = sb_dqopt(sb)->files[type]; > + if (inode) > + inode = igrab(inode); > + dquot_quota_off(sb, type); > + if (inode) > + iput(inode); > + } > +} > + > +static ssize_t shmem_quota_read(struct super_block *sb, int type, char *data, > + size_t len, loff_t off) > +{ > + struct inode *inode = sb_dqopt(sb)->files[type]; > + loff_t i_size = i_size_read(inode); > + struct folio *folio = NULL; > + struct page *page = NULL; > + unsigned long offset; > + int tocopy, err = 0; > + pgoff_t index; > + size_t toread; > + > + index = off >> PAGE_SHIFT; > + offset = off & ~PAGE_MASK; > + > + if (off > i_size) > + return 0; > + if (off+len > i_size) > + len = i_size - off; > + toread = len; > + while (toread > 0) { > + tocopy = PAGE_SIZE - offset < toread ? > + PAGE_SIZE - offset : toread; > + > + err = shmem_get_folio(inode, index, &folio, SGP_READ); > + if (err) { > + if (err == -EINVAL) > + err = 0; > + return err; > + } > + > + if (folio) { folio && folio_test_uptodate() ? > + folio_unlock(folio); > + page = folio_file_page(folio, index); > + if (PageHWPoison(page)) { > + folio_put(folio); > + return -EIO; > + } > + memcpy(data, page_address(page) + offset, tocopy); > + folio_put(folio); Also, I'm a little surprised that it's safe to read the contents of a folio after unlocking it. > + } else { /* A hole */ > + memset(data, 0, tocopy); > + } > + > + offset = 0; > + toread -= tocopy; > + data += tocopy; > + index++; > + cond_resched(); > + } > + return len; > +} > + > +static struct dquot **shmem_get_dquots(struct inode *inode) > +{ > + return SHMEM_I(inode)->i_dquot; > +} > +#endif /* SHMEM_QUOTA_TMPFS */ > + > /* > * shmem_reserve_inode() performs bookkeeping to reserve a shmem inode, and > * produces a novel ino for the newly allocated inode. > @@ -353,7 +590,6 @@ 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; I guess the quotaops helpers take care of the i_blocks updates now? --D > shmem_inode_unacct_blocks(inode, freed); > } > } > @@ -363,7 +599,7 @@ bool shmem_charge(struct inode *inode, long pages) > struct shmem_inode_info *info = SHMEM_I(inode); > unsigned long flags; > > - if (!shmem_inode_acct_block(inode, pages)) > + if (shmem_inode_acct_block(inode, pages)) > return false; > > /* nrpages adjustment first, then shmem_recalc_inode() when balanced */ > @@ -371,7 +607,6 @@ 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); > > @@ -387,7 +622,6 @@ 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); > > @@ -1119,6 +1353,13 @@ static int shmem_setattr(struct user_namespace *mnt_userns, > } > } > > + /* Transfer quota accounting */ > + if (i_uid_needs_update(mnt_userns, attr, inode) || > + i_gid_needs_update(mnt_userns, attr, inode)) > + error = dquot_transfer(mnt_userns, inode, attr); > + if (error) > + return error; > + > setattr_copy(&init_user_ns, inode, attr); > if (attr->ia_valid & ATTR_MODE) > error = posix_acl_chmod(&init_user_ns, inode, inode->i_mode); > @@ -1164,7 +1405,9 @@ 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, > @@ -1569,14 +1812,14 @@ static struct folio *shmem_alloc_and_acct_folio(gfp_t gfp, struct inode *inode, > { > struct shmem_inode_info *info = SHMEM_I(inode); > struct folio *folio; > - int nr; > - int err = -ENOSPC; > + int nr, err; > > if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) > huge = false; > nr = huge ? HPAGE_PMD_NR : 1; > > - if (!shmem_inode_acct_block(inode, nr)) > + err = shmem_inode_acct_block(inode, nr); > + if (err) > goto failed; > > if (huge) > @@ -1949,7 +2192,6 @@ 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; > @@ -2315,8 +2557,10 @@ static void shmem_set_inode_flags(struct inode *inode, unsigned int fsflags) > #define shmem_initxattrs NULL > #endif > > -static struct inode *shmem_get_inode(struct super_block *sb, struct inode *dir, > - umode_t mode, dev_t dev, unsigned long flags) > +static struct inode *shmem_get_inode_noquota(struct super_block *sb, > + struct inode *dir, > + umode_t mode, dev_t dev, > + unsigned long flags) > { > struct inode *inode; > struct shmem_inode_info *info; > @@ -2384,6 +2628,35 @@ static struct inode *shmem_get_inode(struct super_block *sb, struct inode *dir, > return inode; > } > > +static struct inode *shmem_get_inode(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(sb, dir, mode, dev, flags); > + if (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, > @@ -2403,7 +2676,7 @@ int shmem_mfill_atomic_pte(struct mm_struct *dst_mm, > int ret; > pgoff_t max_off; > > - if (!shmem_inode_acct_block(inode, 1)) { > + if (shmem_inode_acct_block(inode, 1)) { > /* > * We may have got a page, returned -ENOENT triggering a retry, > * and now we find ourselves with -ENOMEM. Release the page, to > @@ -2487,7 +2760,6 @@ 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); > > @@ -2908,7 +3180,7 @@ shmem_mknod(struct user_namespace *mnt_userns, struct inode *dir, > int error = -ENOSPC; > > inode = shmem_get_inode(dir->i_sb, dir, mode, dev, VM_NORESERVE); > - if (inode) { > + if (!IS_ERR_OR_NULL(inode)) { > error = simple_acl_create(dir, inode); > if (error) > goto out_iput; > @@ -2924,7 +3196,8 @@ shmem_mknod(struct user_namespace *mnt_userns, struct inode *dir, > inode_inc_iversion(dir); > d_instantiate(dentry, inode); > dget(dentry); /* Extra count - pin the dentry in core */ > - } > + } else if (IS_ERR(inode)) > + error = PTR_ERR(inode); > return error; > out_iput: > iput(inode); > @@ -2939,7 +3212,7 @@ shmem_tmpfile(struct user_namespace *mnt_userns, struct inode *dir, > int error = -ENOSPC; > > inode = shmem_get_inode(dir->i_sb, dir, mode, 0, VM_NORESERVE); > - if (inode) { > + if (!IS_ERR_OR_NULL(inode)) { > error = security_inode_init_security(inode, dir, > NULL, > shmem_initxattrs, NULL); > @@ -2949,7 +3222,8 @@ shmem_tmpfile(struct user_namespace *mnt_userns, struct inode *dir, > if (error) > goto out_iput; > d_tmpfile(file, inode); > - } > + } else if (IS_ERR(inode)) > + error = PTR_ERR(inode); > return finish_open_simple(file, error); > out_iput: > iput(inode); > @@ -3126,6 +3400,8 @@ static int shmem_symlink(struct user_namespace *mnt_userns, struct inode *dir, > VM_NORESERVE); > if (!inode) > return -ENOSPC; > + else if (IS_ERR(inode)) > + return PTR_ERR(inode); > > error = security_inode_init_security(inode, dir, &dentry->d_name, > shmem_initxattrs, NULL); > @@ -3443,6 +3719,7 @@ enum shmem_param { > Opt_uid, > Opt_inode32, > Opt_inode64, > + Opt_quota, > }; > > static const struct constant_table shmem_param_enums_huge[] = { > @@ -3464,6 +3741,9 @@ const struct fs_parameter_spec shmem_fs_parameters[] = { > fsparam_u32 ("uid", Opt_uid), > fsparam_flag ("inode32", Opt_inode32), > fsparam_flag ("inode64", Opt_inode64), > + fsparam_flag ("quota", Opt_quota), > + fsparam_flag ("usrquota", Opt_quota), > + fsparam_flag ("grpquota", Opt_quota), > {} > }; > > @@ -3547,6 +3827,13 @@ 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: > +#ifdef CONFIG_QUOTA > + ctx->seen |= SHMEM_SEEN_QUOTA; > +#else > + goto unsupported_parameter; > +#endif > + break; > } > return 0; > > @@ -3646,6 +3933,12 @@ 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) > @@ -3728,6 +4021,9 @@ static void shmem_put_super(struct super_block *sb) > { > struct shmem_sb_info *sbinfo = SHMEM_SB(sb); > > +#ifdef SHMEM_QUOTA_TMPFS > + shmem_disable_quotas(sb); > +#endif > free_percpu(sbinfo->ino_batch); > percpu_counter_destroy(&sbinfo->used_blocks); > mpol_put(sbinfo->mpol); > @@ -3805,14 +4101,26 @@ static int shmem_fill_super(struct super_block *sb, struct fs_context *fc) > #endif > uuid_gen(&sb->s_uuid); > > +#ifdef SHMEM_QUOTA_TMPFS > + if (ctx->seen & SHMEM_SEEN_QUOTA) { > + sb->dq_op = &dquot_operations; > + sb->s_qcop = &dquot_quotactl_sysfile_ops; > + sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; > + > + if (shmem_enable_quotas(sb)) > + goto failed; > + } > +#endif /* SHMEM_QUOTA_TMPFS */ > + > inode = shmem_get_inode(sb, NULL, S_IFDIR | sbinfo->mode, 0, VM_NORESERVE); > - if (!inode) > + if (IS_ERR_OR_NULL(inode)) > goto failed; > inode->i_uid = sbinfo->uid; > inode->i_gid = sbinfo->gid; > sb->s_root = d_make_root(inode); > if (!sb->s_root) > goto failed; > + > return 0; > > failed: > @@ -3976,7 +4284,12 @@ static const struct super_operations shmem_ops = { > #ifdef CONFIG_TMPFS > .statfs = shmem_statfs, > .show_options = shmem_show_options, > -#endif > +#ifdef CONFIG_QUOTA > + .quota_read = shmem_quota_read, > + .quota_write = shmem_quota_write, > + .get_dquots = shmem_get_dquots, > +#endif /* CONFIG_QUOTA */ > +#endif /* CONFIG_TMPFS */ > .evict_inode = shmem_evict_inode, > .drop_inode = generic_delete_inode, > .put_super = shmem_put_super, > @@ -4196,8 +4509,10 @@ static struct file *__shmem_file_setup(struct vfsmount *mnt, const char *name, l > > inode = shmem_get_inode(mnt->mnt_sb, NULL, S_IFREG | S_IRWXUGO, 0, > flags); > - if (unlikely(!inode)) { > + if (IS_ERR_OR_NULL(inode)) { > shmem_unacct_size(flags, size); > + if (IS_ERR(inode)) > + return (struct file *)inode; > return ERR_PTR(-ENOSPC); > } > inode->i_flags |= i_flags; > -- > 2.38.1 >
On Tue 08-11-22 08:25:22, Darrick J. Wong wrote: > On Tue, Nov 08, 2022 at 02:30:09PM +0100, Lukas Czerner wrote: > > diff --git a/Documentation/filesystems/tmpfs.rst b/Documentation/filesystems/tmpfs.rst > > index 0408c245785e..9c4f228ef4f3 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 Quota accounting is enabled on the mount. Tmpfs is using > > + hidden system quota files that are initialized on mount. > > + Quota limits can quota enforcement can be enabled using > > + standard quota tools. > > +usrquota Same as quota option. Exists for compatibility reasons. > > +grpquota Same as quota option. Exists for compatibility reasons. > > I guess this is following ext* where group and user quota cannot be > enabled individually, nor is there a 'noenforce' mode? Well, in ext4 enforcement of user and group quotas can be enabled separately. usrquota enables enforcement of user quotas, grpquota enables enforcement of group quotas. Quota usage tracking depends on the enabled filesystem features and there you are correct ext4 either tracks both user & group usage or none. OTOH project quota tracking can be selected separately. Frankly, I don't see a great reason to not allow user/group quotas to be tracked independently when we already have all three mount options. I agree the noenforce mode for tmpfs does not make a lot of sense. > > + shmem_quota_write_inode(inode, type, (const char *)&qinfo, > > + sizeof(qinfo), sizeof(qheader)); > > + shmem_quota_write_inode(inode, type, 0, > > + QT_TREEOFF * QUOTABLOCK_SIZE, > > + QUOTABLOCK_SIZE); > > + > > + shmem_set_inode_flags(inode, FS_NOATIME_FL | FS_IMMUTABLE_FL); > > + > > + err = dquot_load_quota_inode(inode, type, QFMT_VFS_V1, > > I wonder, what's the difference between quota v1 and v2? Wouldn't we > want the newer version? So this is a naming catch I've introduced many years ago :-| QFMT_VFS_V1 is the newest quota format we support and is implemented in fs/quota/quota_v2.c > > @@ -353,7 +590,6 @@ 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; > > I guess the quotaops helpers take care of the i_blocks updates now? Yes, dquot_alloc_space() takes care of inode->i_blocks update. Honza
On Tue, Nov 08, 2022 at 02:30:09PM +0100, Lukas Czerner wrote: > + err = shmem_get_folio(inode, index, &folio, SGP_WRITE); > + if (err) > + return err; > + > + page = folio_file_page(folio, index); > + if (PageHWPoison(page)) { > + folio_unlock(folio); > + folio_put(folio); > + return -EIO; > + } > + > + /* Write data, or zeroout the portion of the page */ > + if (data) > + memcpy(page_address(page) + offset, data, len); > + else > + memset(page_address(page) + offset, 0, len); > + > + SetPageUptodate(page); This is suspicious. There is no per-page Uptodate bit, there is only a per-folio Uptodate bit. So this should be folio_mark_uptodate(). Except that you've only done one of the pages in the folio, so you have no business setting the uptodate bit at all.
Hi Lukas,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on linus/master]
[also build test WARNING on v6.1-rc4 next-20221108]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Lukas-Czerner/shmem-user-and-group-quota-support-for-tmpfs/20221108-213245
patch link: https://lore.kernel.org/r/20221108133010.75226-2-lczerner%40redhat.com
patch subject: [PATCH 1/2] shmem: implement user/group quota support for tmpfs
config: riscv-randconfig-s033-20221108
compiler: riscv32-linux-gcc (GCC) 12.1.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# apt-get install sparse
# sparse version: v0.6.4-39-gce1a6720-dirty
# https://github.com/intel-lab-lkp/linux/commit/6f979020eab836196937e50c4e87e4504a56a845
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Lukas-Czerner/shmem-user-and-group-quota-support-for-tmpfs/20221108-213245
git checkout 6f979020eab836196937e50c4e87e4504a56a845
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=riscv SHELL=/bin/bash
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
sparse warnings: (new ones prefixed by >>)
WARNING: invalid argument to '-march': '_zihintpause'
>> mm/shmem.c:385:54: sparse: sparse: Using plain integer as NULL pointer
vim +385 mm/shmem.c
345
346 static int shmem_enable_quotas(struct super_block *sb)
347 {
348 int type, err = 0;
349 struct inode *inode;
350 struct v2_disk_dqheader qheader;
351 struct v2_disk_dqinfo qinfo;
352 static const uint quota_magics[] = V2_INITQMAGICS;
353 static const uint quota_versions[] = V2_INITQVERSIONS;
354
355 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NOLIST_DIRTY;
356 for (type = 0; type < SHMEM_MAXQUOTAS; type++) {
357 inode = shmem_get_inode_noquota(sb, NULL, S_IFREG | 0777, 0,
358 VM_NORESERVE);
359 if (IS_ERR_OR_NULL(inode)) {
360 err = PTR_ERR(inode);
361 goto out_err;
362 }
363 inode->i_flags |= S_NOQUOTA;
364
365 /* Initialize generic quota file header */
366 qheader.dqh_magic = cpu_to_le32(quota_magics[type]);
367 qheader.dqh_version = cpu_to_le32(quota_versions[type]);
368
369 /* Initialize the quota file info structure */
370 qinfo.dqi_bgrace = cpu_to_le32(MAX_DQ_TIME);
371 qinfo.dqi_igrace = cpu_to_le32(MAX_IQ_TIME);
372 qinfo.dqi_flags = cpu_to_le32(0);
373 qinfo.dqi_blocks = cpu_to_le32(QT_TREEOFF + 1);
374 qinfo.dqi_free_blk = cpu_to_le32(0);
375 qinfo.dqi_free_entry = cpu_to_le32(0);
376
377 /*
378 * Write out generic quota header, quota info structure and
379 * zeroout first tree block.
380 */
381 shmem_quota_write_inode(inode, type, (const char *)&qheader,
382 sizeof(qheader), 0);
383 shmem_quota_write_inode(inode, type, (const char *)&qinfo,
384 sizeof(qinfo), sizeof(qheader));
> 385 shmem_quota_write_inode(inode, type, 0,
386 QT_TREEOFF * QUOTABLOCK_SIZE,
387 QUOTABLOCK_SIZE);
388
389 shmem_set_inode_flags(inode, FS_NOATIME_FL | FS_IMMUTABLE_FL);
390
391 err = dquot_load_quota_inode(inode, type, QFMT_VFS_V1,
392 DQUOT_USAGE_ENABLED);
393 iput(inode);
394 if (err)
395 goto out_err;
396 }
397 return 0;
398
399 out_err:
400 pr_warn("tmpfs: failed to enable quota tracking (type=%d, err=%d)\n",
401 type, err);
402 for (type--; type >= 0; type--) {
403 inode = sb_dqopt(sb)->files[type];
404 if (inode)
405 inode = igrab(inode);
406 dquot_quota_off(sb, type);
407 if (inode)
408 iput(inode);
409 }
410 return err;
411 }
412
On Tue, Nov 08, 2022 at 08:25:22AM -0800, Darrick J. Wong wrote: > On Tue, Nov 08, 2022 at 02:30:09PM +0100, Lukas Czerner wrote: > > Implement user and group quota support for tmpfs using system quota file > > in vfsv0 quota format. Because everything in tmpfs is temporary and as a > > result is lost on umount, the quota files are initialized on every > > mount. This also goes for quota limits, that needs to be set up after > > every mount. > > > > The quota support in tmpfs is well separated from the rest of the > > filesystem and is only enabled using mount option -o quota (and > > usrquota and grpquota for compatibility reasons). Only quota accounting > > is enabled this way, enforcement needs to be enable by regular quota > > tools (using Q_QUOTAON ioctl). > > > > Signed-off-by: Lukas Czerner <lczerner@redhat.com> > > --- > > Documentation/filesystems/tmpfs.rst | 12 + > > include/linux/shmem_fs.h | 3 + > > mm/shmem.c | 361 ++++++++++++++++++++++++++-- > > 3 files changed, 353 insertions(+), 23 deletions(-) > > > > diff --git a/Documentation/filesystems/tmpfs.rst b/Documentation/filesystems/tmpfs.rst > > index 0408c245785e..9c4f228ef4f3 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 Quota accounting is enabled on the mount. Tmpfs is using > > + hidden system quota files that are initialized on mount. > > + Quota limits can quota enforcement can be enabled using > > + standard quota tools. > > +usrquota Same as quota option. Exists for compatibility reasons. > > +grpquota Same as quota option. Exists for compatibility reasons. > > I guess this is following ext* where group and user quota cannot be > enabled individually, nor is there a 'noenforce' mode? It's not exactly the same as in ext* as Jan pointed out and the idea was not to bother with enabling user and group quota separately. And there is no 'noenforce' mode. With these options only accounting is enabled. Enforcement can be enabled with ioctl, or using the quota limit options introduced in the second patch. Jan seems to think that it should be possible to enable user and group quotas separately and I have no problem with that. > > Not complaining here, since it /does/ cut down on the number of mount > options. :) > > > +======== ============================================================= > > + > > + > > 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 d500ea967dc7..02a328c98d3a 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_QUOTA > > + struct dquot *i_dquot[MAXQUOTAS]; > > +#endif > > struct inode vfs_inode; > > }; > > > > diff --git a/mm/shmem.c b/mm/shmem.c > > index c1d8b8a1aa3b..ec16659c2255 100644 > > --- a/mm/shmem.c > > +++ b/mm/shmem.c > > @@ -79,6 +79,12 @@ static struct vfsmount *shm_mnt; > > #include <linux/userfaultfd_k.h> > > #include <linux/rmap.h> > > #include <linux/uuid.h> > > +#include <linux/quotaops.h> > > +/* > > + * Required for structures definitions and macros for quote file > > + * initialization. > > + */ > > +#include <../fs/quota/quotaio_v2.h> > > > > #include <linux/uaccess.h> > > > > @@ -120,8 +126,13 @@ struct shmem_options { > > #define SHMEM_SEEN_INODES 2 > > #define SHMEM_SEEN_HUGE 4 > > #define SHMEM_SEEN_INUMS 8 > > +#define SHMEM_SEEN_QUOTA 16 > > }; > > > > +static void shmem_set_inode_flags(struct inode *, unsigned int); > > +static struct inode *shmem_get_inode_noquota(struct super_block *, > > + struct inode *, umode_t, dev_t, unsigned long); > > + > > #ifdef CONFIG_TMPFS > > static unsigned long shmem_default_max_blocks(void) > > { > > @@ -136,6 +147,10 @@ static unsigned long shmem_default_max_inodes(void) > > } > > #endif > > > > +#if defined(CONFIG_TMPFS) && defined(CONFIG_QUOTA) > > +#define SHMEM_QUOTA_TMPFS > > +#endif > > + > > static int shmem_swapin_folio(struct inode *inode, pgoff_t index, > > struct folio **foliop, enum sgp_type sgp, > > gfp_t gfp, struct vm_area_struct *vma, > > @@ -198,26 +213,34 @@ static inline void shmem_unacct_blocks(unsigned long flags, long pages) > > vm_unacct_memory(pages * VM_ACCT(PAGE_SIZE)); > > } > > > > -static inline bool shmem_inode_acct_block(struct inode *inode, long pages) > > +static inline int shmem_inode_acct_block(struct inode *inode, long pages) > > { > > struct shmem_inode_info *info = SHMEM_I(inode); > > struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb); > > + int err = -ENOSPC; > > > > if (shmem_acct_block(info->flags, pages)) > > - return false; > > + return err; > > > > if (sbinfo->max_blocks) { > > if (percpu_counter_compare(&sbinfo->used_blocks, > > sbinfo->max_blocks - pages) > 0) > > goto unacct; > > + if (dquot_alloc_block_nodirty(inode, pages)) { > > + err = -EDQUOT; > > + goto unacct; > > + } > > percpu_counter_add(&sbinfo->used_blocks, pages); > > + } else if (dquot_alloc_block_nodirty(inode, pages)) { > > + err = -EDQUOT; > > + goto unacct; > > } > > > > - return true; > > + return 0; > > > > unacct: > > shmem_unacct_blocks(info->flags, pages); > > - return false; > > + return err; > > } > > > > static inline void shmem_inode_unacct_blocks(struct inode *inode, long pages) > > @@ -225,6 +248,8 @@ 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); > > @@ -247,6 +272,218 @@ bool vma_is_shmem(struct vm_area_struct *vma) > > static LIST_HEAD(shmem_swaplist); > > static DEFINE_MUTEX(shmem_swaplist_mutex); > > > > +#ifdef SHMEM_QUOTA_TMPFS > > + > > +#define SHMEM_MAXQUOTAS 2 > > + > > +/* > > + * Define macros needed for quota file initialization. > > + */ > > +#define MAX_IQ_TIME 604800 /* (7*24*60*60) 1 week */ > > +#define MAX_DQ_TIME 604800 /* (7*24*60*60) 1 week */ > > +#define QT_TREEOFF 1 /* Offset of tree in file in blocks */ > > +#define QUOTABLOCK_BITS 10 > > +#define QUOTABLOCK_SIZE (1 << QUOTABLOCK_BITS) > > + > > +static ssize_t shmem_quota_write_inode(struct inode *inode, int type, > > + const char *data, size_t len, loff_t off) > > +{ > > + loff_t i_size = i_size_read(inode); > > + struct page *page = NULL; > > + unsigned long offset; > > + struct folio *folio; > > + int err = 0; > > + pgoff_t index; > > + > > + index = off >> PAGE_SHIFT; > > + offset = off & ~PAGE_MASK; > > + > > + /* > > + * We expect the write to fit into a single page > > + */ > > + if (PAGE_SIZE - offset < len) { > > + pr_warn("tmpfs: quota write (off=%llu, len=%llu) doesn't fit into a single page\n", > > + (unsigned long long)off, (unsigned long long)len); > > + return -EIO; > > + } > > + > > + err = shmem_get_folio(inode, index, &folio, SGP_WRITE); > > + if (err) > > + return err; > > + > > + page = folio_file_page(folio, index); > > + if (PageHWPoison(page)) { > > + folio_unlock(folio); > > + folio_put(folio); > > + return -EIO; > > + } > > + > > + /* Write data, or zeroout the portion of the page */ > > + if (data) > > + memcpy(page_address(page) + offset, data, len); > > + else > > + memset(page_address(page) + offset, 0, len); > > + > > + SetPageUptodate(page); > > Don't we need to mark the /folio/ uptodate here? Or at least the head > page if the quota file got a THP? > > Hm. shmem_write_end will SetPageUptodate on the head page if it's a > compound page, but it'll set_page_dirty to mark the whole folio dirty. > Now I'm confused completely. :( > > OTOH I guess these are quota files, perhaps they simply don't need THP > anyway? Honestly the folio bussiness is still a bit confusing for me in this regard so I'd have to think some more about what it means and what the right action here is. > > > + flush_dcache_folio(folio); > > + folio_mark_dirty(folio); > > + folio_unlock(folio); > > + folio_put(folio); > > + > > + if (i_size < off + len) > > + i_size_write(inode, off + len); > > + return err ? err : len; > > +} > > + > > +static ssize_t shmem_quota_write(struct super_block *sb, int type, > > + const char *data, size_t len, loff_t off) > > +{ > > + struct inode *inode = sb_dqopt(sb)->files[type]; > > + > > + return shmem_quota_write_inode(inode, type, data, len, off); > > +} > > + > > +static int shmem_enable_quotas(struct super_block *sb) > > +{ > > + int type, err = 0; > > + struct inode *inode; > > + struct v2_disk_dqheader qheader; > > + struct v2_disk_dqinfo qinfo; > > + static const uint quota_magics[] = V2_INITQMAGICS; > > + static const uint quota_versions[] = V2_INITQVERSIONS; > > + > > + sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NOLIST_DIRTY; > > + for (type = 0; type < SHMEM_MAXQUOTAS; type++) { > > + inode = shmem_get_inode_noquota(sb, NULL, S_IFREG | 0777, 0, > > + VM_NORESERVE); > > + if (IS_ERR_OR_NULL(inode)) { > > + err = PTR_ERR(inode); > > + goto out_err; > > + } > > + inode->i_flags |= S_NOQUOTA; > > + > > + /* Initialize generic quota file header */ > > + qheader.dqh_magic = cpu_to_le32(quota_magics[type]); > > + qheader.dqh_version = cpu_to_le32(quota_versions[type]); > > + > > + /* Initialize the quota file info structure */ > > + qinfo.dqi_bgrace = cpu_to_le32(MAX_DQ_TIME); > > + qinfo.dqi_igrace = cpu_to_le32(MAX_IQ_TIME); > > + qinfo.dqi_flags = cpu_to_le32(0); > > + qinfo.dqi_blocks = cpu_to_le32(QT_TREEOFF + 1); > > + qinfo.dqi_free_blk = cpu_to_le32(0); > > + qinfo.dqi_free_entry = cpu_to_le32(0); > > + > > + /* > > + * Write out generic quota header, quota info structure and > > + * zeroout first tree block. > > + */ > > + shmem_quota_write_inode(inode, type, (const char *)&qheader, > > + sizeof(qheader), 0); > > Why is it not important to check error returns here? Because dquot_load_quota_inode() would fail if there is something wrong. But it won't hurt to check the return either. > > > + shmem_quota_write_inode(inode, type, (const char *)&qinfo, > > + sizeof(qinfo), sizeof(qheader)); > > + shmem_quota_write_inode(inode, type, 0, > > + QT_TREEOFF * QUOTABLOCK_SIZE, > > + QUOTABLOCK_SIZE); > > + > > + shmem_set_inode_flags(inode, FS_NOATIME_FL | FS_IMMUTABLE_FL); > > + > > + err = dquot_load_quota_inode(inode, type, QFMT_VFS_V1, > > I wonder, what's the difference between quota v1 and v2? Wouldn't we > want the newer version? As Jan already explained in his reply the QFMT_VFS_V1 is the newest format and yes the versioning is a bit confusing ;) > > > + DQUOT_USAGE_ENABLED); > > + iput(inode); > > + 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--) { > > + inode = sb_dqopt(sb)->files[type]; > > + if (inode) > > + inode = igrab(inode); > > + dquot_quota_off(sb, type); > > + if (inode) > > + iput(inode); > > + } > > + return err; > > +} > > + > > +static void shmem_disable_quotas(struct super_block *sb) > > +{ > > + struct inode *inode = NULL; > > + int type; > > + > > + for (type = 0; type < SHMEM_MAXQUOTAS; type++) { > > + inode = sb_dqopt(sb)->files[type]; > > + if (inode) > > + inode = igrab(inode); > > + dquot_quota_off(sb, type); > > + if (inode) > > + iput(inode); > > + } > > +} > > + > > +static ssize_t shmem_quota_read(struct super_block *sb, int type, char *data, > > + size_t len, loff_t off) > > +{ > > + struct inode *inode = sb_dqopt(sb)->files[type]; > > + loff_t i_size = i_size_read(inode); > > + struct folio *folio = NULL; > > + struct page *page = NULL; > > + unsigned long offset; > > + int tocopy, err = 0; > > + pgoff_t index; > > + size_t toread; > > + > > + index = off >> PAGE_SHIFT; > > + offset = off & ~PAGE_MASK; > > + > > + if (off > i_size) > > + return 0; > > + if (off+len > i_size) > > + len = i_size - off; > > + toread = len; > > + while (toread > 0) { > > + tocopy = PAGE_SIZE - offset < toread ? > > + PAGE_SIZE - offset : toread; > > + > > + err = shmem_get_folio(inode, index, &folio, SGP_READ); > > + if (err) { > > + if (err == -EINVAL) > > + err = 0; > > + return err; > > + } > > + > > + if (folio) { > > folio && folio_test_uptodate() ? > > > + folio_unlock(folio); > > + page = folio_file_page(folio, index); > > + if (PageHWPoison(page)) { > > + folio_put(folio); > > + return -EIO; > > + } > > + memcpy(data, page_address(page) + offset, tocopy); > > + folio_put(folio); > > Also, I'm a little surprised that it's safe to read the contents of a > folio after unlocking it. That's how shmem_file_read_iter() seems to be doing it. Anyway as Jan pointed out we can get rid of the quota_read/write business and just hold the information in memory. My approach worked well as PoC but Jan is right that it's not exactly an efficient way of doing this on memory based fs. > > > + } else { /* A hole */ > > + memset(data, 0, tocopy); > > + } > > + > > + offset = 0; > > + toread -= tocopy; > > + data += tocopy; > > + index++; > > + cond_resched(); > > + } > > + return len; > > +} > > + > > +static struct dquot **shmem_get_dquots(struct inode *inode) > > +{ > > + return SHMEM_I(inode)->i_dquot; > > +} > > +#endif /* SHMEM_QUOTA_TMPFS */ > > + > > /* > > * shmem_reserve_inode() performs bookkeeping to reserve a shmem inode, and > > * produces a novel ino for the newly allocated inode. > > @@ -353,7 +590,6 @@ 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; > > I guess the quotaops helpers take care of the i_blocks updates now? Yes exactly. Thanks! -Lukas > > --D > > > shmem_inode_unacct_blocks(inode, freed); > > } > > } > > @@ -363,7 +599,7 @@ bool shmem_charge(struct inode *inode, long pages) > > struct shmem_inode_info *info = SHMEM_I(inode); > > unsigned long flags; > > > > - if (!shmem_inode_acct_block(inode, pages)) > > + if (shmem_inode_acct_block(inode, pages)) > > return false; > > > > /* nrpages adjustment first, then shmem_recalc_inode() when balanced */ > > @@ -371,7 +607,6 @@ 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); > > > > @@ -387,7 +622,6 @@ 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); > > > > @@ -1119,6 +1353,13 @@ static int shmem_setattr(struct user_namespace *mnt_userns, > > } > > } > > > > + /* Transfer quota accounting */ > > + if (i_uid_needs_update(mnt_userns, attr, inode) || > > + i_gid_needs_update(mnt_userns, attr, inode)) > > + error = dquot_transfer(mnt_userns, inode, attr); > > + if (error) > > + return error; > > + > > setattr_copy(&init_user_ns, inode, attr); > > if (attr->ia_valid & ATTR_MODE) > > error = posix_acl_chmod(&init_user_ns, inode, inode->i_mode); > > @@ -1164,7 +1405,9 @@ 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, > > @@ -1569,14 +1812,14 @@ static struct folio *shmem_alloc_and_acct_folio(gfp_t gfp, struct inode *inode, > > { > > struct shmem_inode_info *info = SHMEM_I(inode); > > struct folio *folio; > > - int nr; > > - int err = -ENOSPC; > > + int nr, err; > > > > if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) > > huge = false; > > nr = huge ? HPAGE_PMD_NR : 1; > > > > - if (!shmem_inode_acct_block(inode, nr)) > > + err = shmem_inode_acct_block(inode, nr); > > + if (err) > > goto failed; > > > > if (huge) > > @@ -1949,7 +2192,6 @@ 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; > > @@ -2315,8 +2557,10 @@ static void shmem_set_inode_flags(struct inode *inode, unsigned int fsflags) > > #define shmem_initxattrs NULL > > #endif > > > > -static struct inode *shmem_get_inode(struct super_block *sb, struct inode *dir, > > - umode_t mode, dev_t dev, unsigned long flags) > > +static struct inode *shmem_get_inode_noquota(struct super_block *sb, > > + struct inode *dir, > > + umode_t mode, dev_t dev, > > + unsigned long flags) > > { > > struct inode *inode; > > struct shmem_inode_info *info; > > @@ -2384,6 +2628,35 @@ static struct inode *shmem_get_inode(struct super_block *sb, struct inode *dir, > > return inode; > > } > > > > +static struct inode *shmem_get_inode(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(sb, dir, mode, dev, flags); > > + if (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, > > @@ -2403,7 +2676,7 @@ int shmem_mfill_atomic_pte(struct mm_struct *dst_mm, > > int ret; > > pgoff_t max_off; > > > > - if (!shmem_inode_acct_block(inode, 1)) { > > + if (shmem_inode_acct_block(inode, 1)) { > > /* > > * We may have got a page, returned -ENOENT triggering a retry, > > * and now we find ourselves with -ENOMEM. Release the page, to > > @@ -2487,7 +2760,6 @@ 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); > > > > @@ -2908,7 +3180,7 @@ shmem_mknod(struct user_namespace *mnt_userns, struct inode *dir, > > int error = -ENOSPC; > > > > inode = shmem_get_inode(dir->i_sb, dir, mode, dev, VM_NORESERVE); > > - if (inode) { > > + if (!IS_ERR_OR_NULL(inode)) { > > error = simple_acl_create(dir, inode); > > if (error) > > goto out_iput; > > @@ -2924,7 +3196,8 @@ shmem_mknod(struct user_namespace *mnt_userns, struct inode *dir, > > inode_inc_iversion(dir); > > d_instantiate(dentry, inode); > > dget(dentry); /* Extra count - pin the dentry in core */ > > - } > > + } else if (IS_ERR(inode)) > > + error = PTR_ERR(inode); > > return error; > > out_iput: > > iput(inode); > > @@ -2939,7 +3212,7 @@ shmem_tmpfile(struct user_namespace *mnt_userns, struct inode *dir, > > int error = -ENOSPC; > > > > inode = shmem_get_inode(dir->i_sb, dir, mode, 0, VM_NORESERVE); > > - if (inode) { > > + if (!IS_ERR_OR_NULL(inode)) { > > error = security_inode_init_security(inode, dir, > > NULL, > > shmem_initxattrs, NULL); > > @@ -2949,7 +3222,8 @@ shmem_tmpfile(struct user_namespace *mnt_userns, struct inode *dir, > > if (error) > > goto out_iput; > > d_tmpfile(file, inode); > > - } > > + } else if (IS_ERR(inode)) > > + error = PTR_ERR(inode); > > return finish_open_simple(file, error); > > out_iput: > > iput(inode); > > @@ -3126,6 +3400,8 @@ static int shmem_symlink(struct user_namespace *mnt_userns, struct inode *dir, > > VM_NORESERVE); > > if (!inode) > > return -ENOSPC; > > + else if (IS_ERR(inode)) > > + return PTR_ERR(inode); > > > > error = security_inode_init_security(inode, dir, &dentry->d_name, > > shmem_initxattrs, NULL); > > @@ -3443,6 +3719,7 @@ enum shmem_param { > > Opt_uid, > > Opt_inode32, > > Opt_inode64, > > + Opt_quota, > > }; > > > > static const struct constant_table shmem_param_enums_huge[] = { > > @@ -3464,6 +3741,9 @@ const struct fs_parameter_spec shmem_fs_parameters[] = { > > fsparam_u32 ("uid", Opt_uid), > > fsparam_flag ("inode32", Opt_inode32), > > fsparam_flag ("inode64", Opt_inode64), > > + fsparam_flag ("quota", Opt_quota), > > + fsparam_flag ("usrquota", Opt_quota), > > + fsparam_flag ("grpquota", Opt_quota), > > {} > > }; > > > > @@ -3547,6 +3827,13 @@ 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: > > +#ifdef CONFIG_QUOTA > > + ctx->seen |= SHMEM_SEEN_QUOTA; > > +#else > > + goto unsupported_parameter; > > +#endif > > + break; > > } > > return 0; > > > > @@ -3646,6 +3933,12 @@ 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) > > @@ -3728,6 +4021,9 @@ static void shmem_put_super(struct super_block *sb) > > { > > struct shmem_sb_info *sbinfo = SHMEM_SB(sb); > > > > +#ifdef SHMEM_QUOTA_TMPFS > > + shmem_disable_quotas(sb); > > +#endif > > free_percpu(sbinfo->ino_batch); > > percpu_counter_destroy(&sbinfo->used_blocks); > > mpol_put(sbinfo->mpol); > > @@ -3805,14 +4101,26 @@ static int shmem_fill_super(struct super_block *sb, struct fs_context *fc) > > #endif > > uuid_gen(&sb->s_uuid); > > > > +#ifdef SHMEM_QUOTA_TMPFS > > + if (ctx->seen & SHMEM_SEEN_QUOTA) { > > + sb->dq_op = &dquot_operations; > > + sb->s_qcop = &dquot_quotactl_sysfile_ops; > > + sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; > > + > > + if (shmem_enable_quotas(sb)) > > + goto failed; > > + } > > +#endif /* SHMEM_QUOTA_TMPFS */ > > + > > inode = shmem_get_inode(sb, NULL, S_IFDIR | sbinfo->mode, 0, VM_NORESERVE); > > - if (!inode) > > + if (IS_ERR_OR_NULL(inode)) > > goto failed; > > inode->i_uid = sbinfo->uid; > > inode->i_gid = sbinfo->gid; > > sb->s_root = d_make_root(inode); > > if (!sb->s_root) > > goto failed; > > + > > return 0; > > > > failed: > > @@ -3976,7 +4284,12 @@ static const struct super_operations shmem_ops = { > > #ifdef CONFIG_TMPFS > > .statfs = shmem_statfs, > > .show_options = shmem_show_options, > > -#endif > > +#ifdef CONFIG_QUOTA > > + .quota_read = shmem_quota_read, > > + .quota_write = shmem_quota_write, > > + .get_dquots = shmem_get_dquots, > > +#endif /* CONFIG_QUOTA */ > > +#endif /* CONFIG_TMPFS */ > > .evict_inode = shmem_evict_inode, > > .drop_inode = generic_delete_inode, > > .put_super = shmem_put_super, > > @@ -4196,8 +4509,10 @@ static struct file *__shmem_file_setup(struct vfsmount *mnt, const char *name, l > > > > inode = shmem_get_inode(mnt->mnt_sb, NULL, S_IFREG | S_IRWXUGO, 0, > > flags); > > - if (unlikely(!inode)) { > > + if (IS_ERR_OR_NULL(inode)) { > > shmem_unacct_size(flags, size); > > + if (IS_ERR(inode)) > > + return (struct file *)inode; > > return ERR_PTR(-ENOSPC); > > } > > inode->i_flags |= i_flags; > > -- > > 2.38.1 > > >
Hi Lukas,
Thank you for the patch! Perhaps something to improve:
[auto build test WARNING on linus/master]
[also build test WARNING on v6.1-rc4 next-20221109]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Lukas-Czerner/shmem-user-and-group-quota-support-for-tmpfs/20221108-213245
patch link: https://lore.kernel.org/r/20221108133010.75226-2-lczerner%40redhat.com
patch subject: [PATCH 1/2] shmem: implement user/group quota support for tmpfs
config: riscv-randconfig-s033-20221108
compiler: riscv32-linux-gcc (GCC) 12.1.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# apt-get install sparse
# sparse version: v0.6.4-39-gce1a6720-dirty
# https://github.com/intel-lab-lkp/linux/commit/6f979020eab836196937e50c4e87e4504a56a845
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Lukas-Czerner/shmem-user-and-group-quota-support-for-tmpfs/20221108-213245
git checkout 6f979020eab836196937e50c4e87e4504a56a845
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=riscv SHELL=/bin/bash
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
sparse warnings: (new ones prefixed by >>)
WARNING: invalid argument to '-march': '_zihintpause'
>> mm/shmem.c:385:54: sparse: sparse: Using plain integer as NULL pointer
vim +385 mm/shmem.c
345
346 static int shmem_enable_quotas(struct super_block *sb)
347 {
348 int type, err = 0;
349 struct inode *inode;
350 struct v2_disk_dqheader qheader;
351 struct v2_disk_dqinfo qinfo;
352 static const uint quota_magics[] = V2_INITQMAGICS;
353 static const uint quota_versions[] = V2_INITQVERSIONS;
354
355 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NOLIST_DIRTY;
356 for (type = 0; type < SHMEM_MAXQUOTAS; type++) {
357 inode = shmem_get_inode_noquota(sb, NULL, S_IFREG | 0777, 0,
358 VM_NORESERVE);
359 if (IS_ERR_OR_NULL(inode)) {
360 err = PTR_ERR(inode);
361 goto out_err;
362 }
363 inode->i_flags |= S_NOQUOTA;
364
365 /* Initialize generic quota file header */
366 qheader.dqh_magic = cpu_to_le32(quota_magics[type]);
367 qheader.dqh_version = cpu_to_le32(quota_versions[type]);
368
369 /* Initialize the quota file info structure */
370 qinfo.dqi_bgrace = cpu_to_le32(MAX_DQ_TIME);
371 qinfo.dqi_igrace = cpu_to_le32(MAX_IQ_TIME);
372 qinfo.dqi_flags = cpu_to_le32(0);
373 qinfo.dqi_blocks = cpu_to_le32(QT_TREEOFF + 1);
374 qinfo.dqi_free_blk = cpu_to_le32(0);
375 qinfo.dqi_free_entry = cpu_to_le32(0);
376
377 /*
378 * Write out generic quota header, quota info structure and
379 * zeroout first tree block.
380 */
381 shmem_quota_write_inode(inode, type, (const char *)&qheader,
382 sizeof(qheader), 0);
383 shmem_quota_write_inode(inode, type, (const char *)&qinfo,
384 sizeof(qinfo), sizeof(qheader));
> 385 shmem_quota_write_inode(inode, type, 0,
386 QT_TREEOFF * QUOTABLOCK_SIZE,
387 QUOTABLOCK_SIZE);
388
389 shmem_set_inode_flags(inode, FS_NOATIME_FL | FS_IMMUTABLE_FL);
390
391 err = dquot_load_quota_inode(inode, type, QFMT_VFS_V1,
392 DQUOT_USAGE_ENABLED);
393 iput(inode);
394 if (err)
395 goto out_err;
396 }
397 return 0;
398
399 out_err:
400 pr_warn("tmpfs: failed to enable quota tracking (type=%d, err=%d)\n",
401 type, err);
402 for (type--; type >= 0; type--) {
403 inode = sb_dqopt(sb)->files[type];
404 if (inode)
405 inode = igrab(inode);
406 dquot_quota_off(sb, type);
407 if (inode)
408 iput(inode);
409 }
410 return err;
411 }
412
Hi Lukas,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on linus/master]
[also build test ERROR on v6.1-rc4 next-20221111]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Lukas-Czerner/shmem-user-and-group-quota-support-for-tmpfs/20221108-213245
patch link: https://lore.kernel.org/r/20221108133010.75226-2-lczerner%40redhat.com
patch subject: [PATCH 1/2] shmem: implement user/group quota support for tmpfs
config: riscv-randconfig-r033-20221108
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 463da45892e2d2a262277b91b96f5f8c05dc25d0)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install riscv cross compiling tool for clang build
# apt-get install binutils-riscv-linux-gnu
# https://github.com/intel-lab-lkp/linux/commit/6f979020eab836196937e50c4e87e4504a56a845
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Lukas-Czerner/shmem-user-and-group-quota-support-for-tmpfs/20221108-213245
git checkout 6f979020eab836196937e50c4e87e4504a56a845
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
All errors (new ones prefixed by >>):
>> mm/shmem.c:4515:11: error: casting from randomized structure pointer type 'struct inode *' to 'struct file *'
return (struct file *)inode;
^
1 error generated.
vim +4515 mm/shmem.c
4494
4495 static struct file *__shmem_file_setup(struct vfsmount *mnt, const char *name, loff_t size,
4496 unsigned long flags, unsigned int i_flags)
4497 {
4498 struct inode *inode;
4499 struct file *res;
4500
4501 if (IS_ERR(mnt))
4502 return ERR_CAST(mnt);
4503
4504 if (size < 0 || size > MAX_LFS_FILESIZE)
4505 return ERR_PTR(-EINVAL);
4506
4507 if (shmem_acct_size(flags, size))
4508 return ERR_PTR(-ENOMEM);
4509
4510 inode = shmem_get_inode(mnt->mnt_sb, NULL, S_IFREG | S_IRWXUGO, 0,
4511 flags);
4512 if (IS_ERR_OR_NULL(inode)) {
4513 shmem_unacct_size(flags, size);
4514 if (IS_ERR(inode))
> 4515 return (struct file *)inode;
4516 return ERR_PTR(-ENOSPC);
4517 }
4518 inode->i_flags |= i_flags;
4519 inode->i_size = size;
4520 clear_nlink(inode); /* It is unlinked */
4521 res = ERR_PTR(ramfs_nommu_expand_for_mapping(inode, size));
4522 if (!IS_ERR(res))
4523 res = alloc_file_pseudo(inode, mnt, name, O_RDWR,
4524 &shmem_file_operations);
4525 if (IS_ERR(res))
4526 iput(inode);
4527 return res;
4528 }
4529
diff --git a/Documentation/filesystems/tmpfs.rst b/Documentation/filesystems/tmpfs.rst index 0408c245785e..9c4f228ef4f3 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 Quota accounting is enabled on the mount. Tmpfs is using + hidden system quota files that are initialized on mount. + Quota limits can quota enforcement can be enabled using + standard quota tools. +usrquota Same as quota option. Exists for compatibility reasons. +grpquota Same as quota option. Exists for compatibility reasons. +======== ============================================================= + + 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 d500ea967dc7..02a328c98d3a 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_QUOTA + struct dquot *i_dquot[MAXQUOTAS]; +#endif struct inode vfs_inode; }; diff --git a/mm/shmem.c b/mm/shmem.c index c1d8b8a1aa3b..ec16659c2255 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -79,6 +79,12 @@ static struct vfsmount *shm_mnt; #include <linux/userfaultfd_k.h> #include <linux/rmap.h> #include <linux/uuid.h> +#include <linux/quotaops.h> +/* + * Required for structures definitions and macros for quote file + * initialization. + */ +#include <../fs/quota/quotaio_v2.h> #include <linux/uaccess.h> @@ -120,8 +126,13 @@ struct shmem_options { #define SHMEM_SEEN_INODES 2 #define SHMEM_SEEN_HUGE 4 #define SHMEM_SEEN_INUMS 8 +#define SHMEM_SEEN_QUOTA 16 }; +static void shmem_set_inode_flags(struct inode *, unsigned int); +static struct inode *shmem_get_inode_noquota(struct super_block *, + struct inode *, umode_t, dev_t, unsigned long); + #ifdef CONFIG_TMPFS static unsigned long shmem_default_max_blocks(void) { @@ -136,6 +147,10 @@ static unsigned long shmem_default_max_inodes(void) } #endif +#if defined(CONFIG_TMPFS) && defined(CONFIG_QUOTA) +#define SHMEM_QUOTA_TMPFS +#endif + static int shmem_swapin_folio(struct inode *inode, pgoff_t index, struct folio **foliop, enum sgp_type sgp, gfp_t gfp, struct vm_area_struct *vma, @@ -198,26 +213,34 @@ static inline void shmem_unacct_blocks(unsigned long flags, long pages) vm_unacct_memory(pages * VM_ACCT(PAGE_SIZE)); } -static inline bool shmem_inode_acct_block(struct inode *inode, long pages) +static inline int shmem_inode_acct_block(struct inode *inode, long pages) { struct shmem_inode_info *info = SHMEM_I(inode); struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb); + int err = -ENOSPC; if (shmem_acct_block(info->flags, pages)) - return false; + return err; if (sbinfo->max_blocks) { if (percpu_counter_compare(&sbinfo->used_blocks, sbinfo->max_blocks - pages) > 0) goto unacct; + if (dquot_alloc_block_nodirty(inode, pages)) { + err = -EDQUOT; + goto unacct; + } percpu_counter_add(&sbinfo->used_blocks, pages); + } else if (dquot_alloc_block_nodirty(inode, pages)) { + err = -EDQUOT; + goto unacct; } - return true; + return 0; unacct: shmem_unacct_blocks(info->flags, pages); - return false; + return err; } static inline void shmem_inode_unacct_blocks(struct inode *inode, long pages) @@ -225,6 +248,8 @@ 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); @@ -247,6 +272,218 @@ bool vma_is_shmem(struct vm_area_struct *vma) static LIST_HEAD(shmem_swaplist); static DEFINE_MUTEX(shmem_swaplist_mutex); +#ifdef SHMEM_QUOTA_TMPFS + +#define SHMEM_MAXQUOTAS 2 + +/* + * Define macros needed for quota file initialization. + */ +#define MAX_IQ_TIME 604800 /* (7*24*60*60) 1 week */ +#define MAX_DQ_TIME 604800 /* (7*24*60*60) 1 week */ +#define QT_TREEOFF 1 /* Offset of tree in file in blocks */ +#define QUOTABLOCK_BITS 10 +#define QUOTABLOCK_SIZE (1 << QUOTABLOCK_BITS) + +static ssize_t shmem_quota_write_inode(struct inode *inode, int type, + const char *data, size_t len, loff_t off) +{ + loff_t i_size = i_size_read(inode); + struct page *page = NULL; + unsigned long offset; + struct folio *folio; + int err = 0; + pgoff_t index; + + index = off >> PAGE_SHIFT; + offset = off & ~PAGE_MASK; + + /* + * We expect the write to fit into a single page + */ + if (PAGE_SIZE - offset < len) { + pr_warn("tmpfs: quota write (off=%llu, len=%llu) doesn't fit into a single page\n", + (unsigned long long)off, (unsigned long long)len); + return -EIO; + } + + err = shmem_get_folio(inode, index, &folio, SGP_WRITE); + if (err) + return err; + + page = folio_file_page(folio, index); + if (PageHWPoison(page)) { + folio_unlock(folio); + folio_put(folio); + return -EIO; + } + + /* Write data, or zeroout the portion of the page */ + if (data) + memcpy(page_address(page) + offset, data, len); + else + memset(page_address(page) + offset, 0, len); + + SetPageUptodate(page); + flush_dcache_folio(folio); + folio_mark_dirty(folio); + folio_unlock(folio); + folio_put(folio); + + if (i_size < off + len) + i_size_write(inode, off + len); + return err ? err : len; +} + +static ssize_t shmem_quota_write(struct super_block *sb, int type, + const char *data, size_t len, loff_t off) +{ + struct inode *inode = sb_dqopt(sb)->files[type]; + + return shmem_quota_write_inode(inode, type, data, len, off); +} + +static int shmem_enable_quotas(struct super_block *sb) +{ + int type, err = 0; + struct inode *inode; + struct v2_disk_dqheader qheader; + struct v2_disk_dqinfo qinfo; + static const uint quota_magics[] = V2_INITQMAGICS; + static const uint quota_versions[] = V2_INITQVERSIONS; + + sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NOLIST_DIRTY; + for (type = 0; type < SHMEM_MAXQUOTAS; type++) { + inode = shmem_get_inode_noquota(sb, NULL, S_IFREG | 0777, 0, + VM_NORESERVE); + if (IS_ERR_OR_NULL(inode)) { + err = PTR_ERR(inode); + goto out_err; + } + inode->i_flags |= S_NOQUOTA; + + /* Initialize generic quota file header */ + qheader.dqh_magic = cpu_to_le32(quota_magics[type]); + qheader.dqh_version = cpu_to_le32(quota_versions[type]); + + /* Initialize the quota file info structure */ + qinfo.dqi_bgrace = cpu_to_le32(MAX_DQ_TIME); + qinfo.dqi_igrace = cpu_to_le32(MAX_IQ_TIME); + qinfo.dqi_flags = cpu_to_le32(0); + qinfo.dqi_blocks = cpu_to_le32(QT_TREEOFF + 1); + qinfo.dqi_free_blk = cpu_to_le32(0); + qinfo.dqi_free_entry = cpu_to_le32(0); + + /* + * Write out generic quota header, quota info structure and + * zeroout first tree block. + */ + shmem_quota_write_inode(inode, type, (const char *)&qheader, + sizeof(qheader), 0); + shmem_quota_write_inode(inode, type, (const char *)&qinfo, + sizeof(qinfo), sizeof(qheader)); + shmem_quota_write_inode(inode, type, 0, + QT_TREEOFF * QUOTABLOCK_SIZE, + QUOTABLOCK_SIZE); + + shmem_set_inode_flags(inode, FS_NOATIME_FL | FS_IMMUTABLE_FL); + + err = dquot_load_quota_inode(inode, type, QFMT_VFS_V1, + DQUOT_USAGE_ENABLED); + iput(inode); + 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--) { + inode = sb_dqopt(sb)->files[type]; + if (inode) + inode = igrab(inode); + dquot_quota_off(sb, type); + if (inode) + iput(inode); + } + return err; +} + +static void shmem_disable_quotas(struct super_block *sb) +{ + struct inode *inode = NULL; + int type; + + for (type = 0; type < SHMEM_MAXQUOTAS; type++) { + inode = sb_dqopt(sb)->files[type]; + if (inode) + inode = igrab(inode); + dquot_quota_off(sb, type); + if (inode) + iput(inode); + } +} + +static ssize_t shmem_quota_read(struct super_block *sb, int type, char *data, + size_t len, loff_t off) +{ + struct inode *inode = sb_dqopt(sb)->files[type]; + loff_t i_size = i_size_read(inode); + struct folio *folio = NULL; + struct page *page = NULL; + unsigned long offset; + int tocopy, err = 0; + pgoff_t index; + size_t toread; + + index = off >> PAGE_SHIFT; + offset = off & ~PAGE_MASK; + + if (off > i_size) + return 0; + if (off+len > i_size) + len = i_size - off; + toread = len; + while (toread > 0) { + tocopy = PAGE_SIZE - offset < toread ? + PAGE_SIZE - offset : toread; + + err = shmem_get_folio(inode, index, &folio, SGP_READ); + if (err) { + if (err == -EINVAL) + err = 0; + return err; + } + + if (folio) { + folio_unlock(folio); + page = folio_file_page(folio, index); + if (PageHWPoison(page)) { + folio_put(folio); + return -EIO; + } + memcpy(data, page_address(page) + offset, tocopy); + folio_put(folio); + } else { /* A hole */ + memset(data, 0, tocopy); + } + + offset = 0; + toread -= tocopy; + data += tocopy; + index++; + cond_resched(); + } + return len; +} + +static struct dquot **shmem_get_dquots(struct inode *inode) +{ + return SHMEM_I(inode)->i_dquot; +} +#endif /* SHMEM_QUOTA_TMPFS */ + /* * shmem_reserve_inode() performs bookkeeping to reserve a shmem inode, and * produces a novel ino for the newly allocated inode. @@ -353,7 +590,6 @@ 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); } } @@ -363,7 +599,7 @@ bool shmem_charge(struct inode *inode, long pages) struct shmem_inode_info *info = SHMEM_I(inode); unsigned long flags; - if (!shmem_inode_acct_block(inode, pages)) + if (shmem_inode_acct_block(inode, pages)) return false; /* nrpages adjustment first, then shmem_recalc_inode() when balanced */ @@ -371,7 +607,6 @@ 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); @@ -387,7 +622,6 @@ 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); @@ -1119,6 +1353,13 @@ static int shmem_setattr(struct user_namespace *mnt_userns, } } + /* Transfer quota accounting */ + if (i_uid_needs_update(mnt_userns, attr, inode) || + i_gid_needs_update(mnt_userns, attr, inode)) + error = dquot_transfer(mnt_userns, inode, attr); + if (error) + return error; + setattr_copy(&init_user_ns, inode, attr); if (attr->ia_valid & ATTR_MODE) error = posix_acl_chmod(&init_user_ns, inode, inode->i_mode); @@ -1164,7 +1405,9 @@ 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, @@ -1569,14 +1812,14 @@ static struct folio *shmem_alloc_and_acct_folio(gfp_t gfp, struct inode *inode, { struct shmem_inode_info *info = SHMEM_I(inode); struct folio *folio; - int nr; - int err = -ENOSPC; + int nr, err; if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) huge = false; nr = huge ? HPAGE_PMD_NR : 1; - if (!shmem_inode_acct_block(inode, nr)) + err = shmem_inode_acct_block(inode, nr); + if (err) goto failed; if (huge) @@ -1949,7 +2192,6 @@ 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; @@ -2315,8 +2557,10 @@ static void shmem_set_inode_flags(struct inode *inode, unsigned int fsflags) #define shmem_initxattrs NULL #endif -static struct inode *shmem_get_inode(struct super_block *sb, struct inode *dir, - umode_t mode, dev_t dev, unsigned long flags) +static struct inode *shmem_get_inode_noquota(struct super_block *sb, + struct inode *dir, + umode_t mode, dev_t dev, + unsigned long flags) { struct inode *inode; struct shmem_inode_info *info; @@ -2384,6 +2628,35 @@ static struct inode *shmem_get_inode(struct super_block *sb, struct inode *dir, return inode; } +static struct inode *shmem_get_inode(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(sb, dir, mode, dev, flags); + if (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, @@ -2403,7 +2676,7 @@ int shmem_mfill_atomic_pte(struct mm_struct *dst_mm, int ret; pgoff_t max_off; - if (!shmem_inode_acct_block(inode, 1)) { + if (shmem_inode_acct_block(inode, 1)) { /* * We may have got a page, returned -ENOENT triggering a retry, * and now we find ourselves with -ENOMEM. Release the page, to @@ -2487,7 +2760,6 @@ 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); @@ -2908,7 +3180,7 @@ shmem_mknod(struct user_namespace *mnt_userns, struct inode *dir, int error = -ENOSPC; inode = shmem_get_inode(dir->i_sb, dir, mode, dev, VM_NORESERVE); - if (inode) { + if (!IS_ERR_OR_NULL(inode)) { error = simple_acl_create(dir, inode); if (error) goto out_iput; @@ -2924,7 +3196,8 @@ shmem_mknod(struct user_namespace *mnt_userns, struct inode *dir, inode_inc_iversion(dir); d_instantiate(dentry, inode); dget(dentry); /* Extra count - pin the dentry in core */ - } + } else if (IS_ERR(inode)) + error = PTR_ERR(inode); return error; out_iput: iput(inode); @@ -2939,7 +3212,7 @@ shmem_tmpfile(struct user_namespace *mnt_userns, struct inode *dir, int error = -ENOSPC; inode = shmem_get_inode(dir->i_sb, dir, mode, 0, VM_NORESERVE); - if (inode) { + if (!IS_ERR_OR_NULL(inode)) { error = security_inode_init_security(inode, dir, NULL, shmem_initxattrs, NULL); @@ -2949,7 +3222,8 @@ shmem_tmpfile(struct user_namespace *mnt_userns, struct inode *dir, if (error) goto out_iput; d_tmpfile(file, inode); - } + } else if (IS_ERR(inode)) + error = PTR_ERR(inode); return finish_open_simple(file, error); out_iput: iput(inode); @@ -3126,6 +3400,8 @@ static int shmem_symlink(struct user_namespace *mnt_userns, struct inode *dir, VM_NORESERVE); if (!inode) return -ENOSPC; + else if (IS_ERR(inode)) + return PTR_ERR(inode); error = security_inode_init_security(inode, dir, &dentry->d_name, shmem_initxattrs, NULL); @@ -3443,6 +3719,7 @@ enum shmem_param { Opt_uid, Opt_inode32, Opt_inode64, + Opt_quota, }; static const struct constant_table shmem_param_enums_huge[] = { @@ -3464,6 +3741,9 @@ const struct fs_parameter_spec shmem_fs_parameters[] = { fsparam_u32 ("uid", Opt_uid), fsparam_flag ("inode32", Opt_inode32), fsparam_flag ("inode64", Opt_inode64), + fsparam_flag ("quota", Opt_quota), + fsparam_flag ("usrquota", Opt_quota), + fsparam_flag ("grpquota", Opt_quota), {} }; @@ -3547,6 +3827,13 @@ 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: +#ifdef CONFIG_QUOTA + ctx->seen |= SHMEM_SEEN_QUOTA; +#else + goto unsupported_parameter; +#endif + break; } return 0; @@ -3646,6 +3933,12 @@ 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) @@ -3728,6 +4021,9 @@ static void shmem_put_super(struct super_block *sb) { struct shmem_sb_info *sbinfo = SHMEM_SB(sb); +#ifdef SHMEM_QUOTA_TMPFS + shmem_disable_quotas(sb); +#endif free_percpu(sbinfo->ino_batch); percpu_counter_destroy(&sbinfo->used_blocks); mpol_put(sbinfo->mpol); @@ -3805,14 +4101,26 @@ static int shmem_fill_super(struct super_block *sb, struct fs_context *fc) #endif uuid_gen(&sb->s_uuid); +#ifdef SHMEM_QUOTA_TMPFS + if (ctx->seen & SHMEM_SEEN_QUOTA) { + sb->dq_op = &dquot_operations; + sb->s_qcop = &dquot_quotactl_sysfile_ops; + sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; + + if (shmem_enable_quotas(sb)) + goto failed; + } +#endif /* SHMEM_QUOTA_TMPFS */ + inode = shmem_get_inode(sb, NULL, S_IFDIR | sbinfo->mode, 0, VM_NORESERVE); - if (!inode) + if (IS_ERR_OR_NULL(inode)) goto failed; inode->i_uid = sbinfo->uid; inode->i_gid = sbinfo->gid; sb->s_root = d_make_root(inode); if (!sb->s_root) goto failed; + return 0; failed: @@ -3976,7 +4284,12 @@ static const struct super_operations shmem_ops = { #ifdef CONFIG_TMPFS .statfs = shmem_statfs, .show_options = shmem_show_options, -#endif +#ifdef CONFIG_QUOTA + .quota_read = shmem_quota_read, + .quota_write = shmem_quota_write, + .get_dquots = shmem_get_dquots, +#endif /* CONFIG_QUOTA */ +#endif /* CONFIG_TMPFS */ .evict_inode = shmem_evict_inode, .drop_inode = generic_delete_inode, .put_super = shmem_put_super, @@ -4196,8 +4509,10 @@ static struct file *__shmem_file_setup(struct vfsmount *mnt, const char *name, l inode = shmem_get_inode(mnt->mnt_sb, NULL, S_IFREG | S_IRWXUGO, 0, flags); - if (unlikely(!inode)) { + if (IS_ERR_OR_NULL(inode)) { shmem_unacct_size(flags, size); + if (IS_ERR(inode)) + return (struct file *)inode; return ERR_PTR(-ENOSPC); } inode->i_flags |= i_flags;
Implement user and group quota support for tmpfs using system quota file in vfsv0 quota format. Because everything in tmpfs is temporary and as a result is lost on umount, the quota files are initialized on every mount. This also goes for quota limits, that needs to be set up after every mount. The quota support in tmpfs is well separated from the rest of the filesystem and is only enabled using mount option -o quota (and usrquota and grpquota for compatibility reasons). Only quota accounting is enabled this way, enforcement needs to be enable by regular quota tools (using Q_QUOTAON ioctl). Signed-off-by: Lukas Czerner <lczerner@redhat.com> --- Documentation/filesystems/tmpfs.rst | 12 + include/linux/shmem_fs.h | 3 + mm/shmem.c | 361 ++++++++++++++++++++++++++-- 3 files changed, 353 insertions(+), 23 deletions(-)