diff mbox series

[1/6] shmem: make shmem_inode_acct_block() return error

Message ID 20230403084759.884681-2-cem@kernel.org (mailing list archive)
State New
Headers show
Series shmem: Add user and group quota support for tmpfs | expand

Commit Message

Carlos Maiolino April 3, 2023, 8:47 a.m. UTC 
From: Lukas Czerner <lczerner@redhat.com>

Make shmem_inode_acct_block() return proper error code instead of bool.
This will be useful later when we introduce quota support.

There should be no functional change.

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: Carlos Maiolino <cmaiolino@redhat.com>
---
 mm/shmem.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

Comments

Jan Kara April 4, 2023, 10:59 a.m. UTC | #1 
On Mon 03-04-23 10:47:54, cem@kernel.org wrote:
> From: Lukas Czerner <lczerner@redhat.com>
> 
> Make shmem_inode_acct_block() return proper error code instead of bool.
> This will be useful later when we introduce quota support.
> 
> There should be no functional change.
> 
> Signed-off-by: Lukas Czerner <lczerner@redhat.com>
> Signed-off-by: Carlos Maiolino <cmaiolino@redhat.com>

Looks good to me, except one minor nit.

> @@ -1589,7 +1590,8 @@ static struct folio *shmem_alloc_and_acct_folio(gfp_t gfp, struct inode *inode,
>  		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)

The initialization of 'err' in this function is unused now so it can be
dropped.

								Honza
diff mbox series

Patch

diff --git a/mm/shmem.c b/mm/shmem.c
index 448f393d8ab2b..0e63ea5f6ce69 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -198,13 +198,14 @@  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,
@@ -213,11 +214,11 @@  static inline bool shmem_inode_acct_block(struct inode *inode, long pages)
 		percpu_counter_add(&sbinfo->used_blocks, pages);
 	}
 
-	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)
@@ -369,7 +370,7 @@  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 */
@@ -1589,7 +1590,8 @@  static struct folio *shmem_alloc_and_acct_folio(gfp_t gfp, struct inode *inode,
 		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)
@@ -2433,7 +2435,7 @@  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