Rmys
218 lines
6.6 KiB
Diff
218 lines
6.6 KiB
Diff
SPDX-License-Identifier: GPL-2.0
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diff --git a/include/linux/shmem_fs.h b/include/linux/shmem_fs.h
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index 515a9a6a3c6f..9de809dac3be 100644
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--- a/include/linux/shmem_fs.h
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+++ b/include/linux/shmem_fs.h
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@@ -55,10 +55,13 @@ struct shmem_quota_limits {
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};
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struct shmem_sb_info {
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+ struct mutex idr_lock;
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+ bool idr_nouse;
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+ struct idr idr; /* manages inode-number */
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unsigned long max_blocks; /* How many blocks are allowed */
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struct percpu_counter used_blocks; /* How many are allocated */
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- unsigned long max_inodes; /* How many inodes are allowed */
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- unsigned long free_ispace; /* How much ispace left for allocation */
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+ int max_inodes; /* How many inodes are allowed */
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+ unsigned long free_ispace; /* How many are left for allocation */
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raw_spinlock_t stat_lock; /* Serialize shmem_sb_info changes */
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umode_t mode; /* Mount mode for root directory */
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unsigned char huge; /* Whether to try for hugepages */
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diff --git a/mm/shmem.c b/mm/shmem.c
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index 568bb290bdce..f8869230f782 100644
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--- a/mm/shmem.c
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+++ b/mm/shmem.c
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@@ -112,7 +112,7 @@ struct shmem_falloc {
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struct shmem_options {
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unsigned long long blocks;
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- unsigned long long inodes;
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+ int inodes;
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struct mempolicy *mpol;
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kuid_t uid;
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kgid_t gid;
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@@ -144,12 +144,14 @@ static unsigned long shmem_default_max_blocks(void)
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return totalram_pages() / 2;
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}
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-static unsigned long shmem_default_max_inodes(void)
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+static int shmem_default_max_inodes(void)
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{
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unsigned long nr_pages = totalram_pages();
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+ unsigned long ul;
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- return min3(nr_pages - totalhigh_pages(), nr_pages / 2,
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- ULONG_MAX / BOGO_INODE_SIZE);
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+ ul = INT_MAX;
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+ ul = min3(ul, nr_pages - totalhigh_pages(), nr_pages / 2);
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+ return ul;
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}
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#endif
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@@ -1291,6 +1293,11 @@ static void shmem_evict_inode(struct inode *inode)
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}
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simple_xattrs_free(&info->xattrs, sbinfo->max_inodes ? &freed : NULL);
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+ if (!sbinfo->idr_nouse && inode->i_ino) {
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+ mutex_lock(&sbinfo->idr_lock);
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+ idr_remove(&sbinfo->idr, inode->i_ino);
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+ mutex_unlock(&sbinfo->idr_lock);
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+ }
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shmem_free_inode(inode->i_sb, freed);
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WARN_ON(inode->i_blocks);
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clear_inode(inode);
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@@ -2854,6 +2861,25 @@ static struct inode *__shmem_get_inode(struct mnt_idmap *idmap,
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break;
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}
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+ if (!sbinfo->idr_nouse) {
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+ /* inum 0 and 1 are unused */
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+ mutex_lock(&sbinfo->idr_lock);
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+ ino = idr_alloc(&sbinfo->idr, inode, 2, INT_MAX,
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+ GFP_NOFS);
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+ if (ino > 0) {
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+ inode->i_ino = ino;
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+ mutex_unlock(&sbinfo->idr_lock);
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+ __insert_inode_hash(inode, inode->i_ino);
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+ } else {
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+ inode->i_ino = 0;
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+ mutex_unlock(&sbinfo->idr_lock);
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+ iput(inode);
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+ /* shmem_free_inode() will be called */
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+ inode = NULL;
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+ }
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+ } else
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+ inode->i_ino = ino;
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+
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lockdep_annotate_inode_mutex_key(inode);
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return inode;
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}
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@@ -4098,8 +4124,7 @@ static struct dentry *shmem_get_parent(struct dentry *child)
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static int shmem_match(struct inode *ino, void *vfh)
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{
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__u32 *fh = vfh;
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- __u64 inum = fh[2];
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- inum = (inum << 32) | fh[1];
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+ __u64 inum = fh[1];
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return ino->i_ino == inum && fh[0] == ino->i_generation;
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}
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@@ -4118,14 +4143,11 @@ static struct dentry *shmem_fh_to_dentry(struct super_block *sb,
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struct dentry *dentry = NULL;
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u64 inum;
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- if (fh_len < 3)
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+ if (fh_len < 2)
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return NULL;
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- inum = fid->raw[2];
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- inum = (inum << 32) | fid->raw[1];
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-
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- inode = ilookup5(sb, (unsigned long)(inum + fid->raw[0]),
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- shmem_match, fid->raw);
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+ inum = fid->raw[1];
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+ inode = ilookup5(sb, inum, shmem_match, fid->raw);
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if (inode) {
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dentry = shmem_find_alias(inode);
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iput(inode);
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@@ -4137,30 +4159,15 @@ static struct dentry *shmem_fh_to_dentry(struct super_block *sb,
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static int shmem_encode_fh(struct inode *inode, __u32 *fh, int *len,
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struct inode *parent)
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{
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- if (*len < 3) {
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- *len = 3;
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+ if (*len < 2) {
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+ *len = 2;
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return FILEID_INVALID;
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}
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- if (inode_unhashed(inode)) {
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- /* Unfortunately insert_inode_hash is not idempotent,
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- * so as we hash inodes here rather than at creation
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- * time, we need a lock to ensure we only try
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- * to do it once
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- */
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- static DEFINE_SPINLOCK(lock);
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- spin_lock(&lock);
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- if (inode_unhashed(inode))
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- __insert_inode_hash(inode,
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- inode->i_ino + inode->i_generation);
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- spin_unlock(&lock);
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- }
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-
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fh[0] = inode->i_generation;
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fh[1] = inode->i_ino;
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- fh[2] = ((__u64)inode->i_ino) >> 32;
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- *len = 3;
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+ *len = 2;
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return 1;
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}
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@@ -4259,7 +4266,7 @@ static int shmem_parse_one(struct fs_context *fc, struct fs_parameter *param)
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break;
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case Opt_nr_inodes:
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ctx->inodes = memparse(param->string, &rest);
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- if (*rest || ctx->inodes > ULONG_MAX / BOGO_INODE_SIZE)
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+ if (*rest || ctx->inodes < 2 || ctx->inodes > INT_MAX)
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goto bad_value;
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ctx->seen |= SHMEM_SEEN_INODES;
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break;
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@@ -4541,7 +4548,7 @@ static int shmem_show_options(struct seq_file *seq, struct dentry *root)
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if (sbinfo->max_blocks != shmem_default_max_blocks())
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seq_printf(seq, ",size=%luk", K(sbinfo->max_blocks));
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if (sbinfo->max_inodes != shmem_default_max_inodes())
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- seq_printf(seq, ",nr_inodes=%lu", sbinfo->max_inodes);
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+ seq_printf(seq, ",nr_inodes=%d", sbinfo->max_inodes);
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if (sbinfo->mode != (0777 | S_ISVTX))
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seq_printf(seq, ",mode=%03ho", sbinfo->mode);
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if (!uid_eq(sbinfo->uid, GLOBAL_ROOT_UID))
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@@ -4613,6 +4620,8 @@ static void shmem_put_super(struct super_block *sb)
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#ifdef CONFIG_TMPFS_QUOTA
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shmem_disable_quotas(sb);
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#endif
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+ if (!sbinfo->idr_nouse)
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+ idr_destroy(&sbinfo->idr);
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free_percpu(sbinfo->ino_batch);
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percpu_counter_destroy(&sbinfo->used_blocks);
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mpol_put(sbinfo->mpol);
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@@ -4657,9 +4666,11 @@ static int shmem_fill_super(struct super_block *sb, struct fs_context *fc)
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#else
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sb->s_flags |= SB_NOUSER;
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#endif
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+ mutex_init(&sbinfo->idr_lock);
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+ idr_init(&sbinfo->idr);
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sbinfo->max_blocks = ctx->blocks;
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sbinfo->max_inodes = ctx->inodes;
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- sbinfo->free_ispace = sbinfo->max_inodes * BOGO_INODE_SIZE;
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+ sbinfo->free_ispace = (unsigned long)sbinfo->max_inodes * BOGO_INODE_SIZE;
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if (sb->s_flags & SB_KERNMOUNT) {
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sbinfo->ino_batch = alloc_percpu(ino_t);
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if (!sbinfo->ino_batch)
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@@ -4804,6 +4815,15 @@ static int shmem_error_remove_folio(struct address_space *mapping,
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return 0;
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}
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+static __init void shmem_no_idr(struct super_block *sb)
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+{
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+ struct shmem_sb_info *sbinfo;
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+
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+ sbinfo = SHMEM_SB(sb);
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+ sbinfo->idr_nouse = true;
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+ idr_destroy(&sbinfo->idr);
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+}
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+
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static const struct address_space_operations shmem_aops = {
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.writepage = shmem_writepage,
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.dirty_folio = noop_dirty_folio,
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@@ -4968,6 +4988,7 @@ void __init shmem_init(void)
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pr_err("Could not kern_mount tmpfs\n");
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goto out1;
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}
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+ shmem_no_idr(shm_mnt->mnt_sb);
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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if (has_transparent_hugepage() && shmem_huge > SHMEM_HUGE_DENY)
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