4.9-stable review patch. If anyone has any objections, please let me know.
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commit 0f0796945614b7523987f7eea32407421af4b1ee upstream.
The shmem_acct_block and the update of used_blocks are following one another in all the places they are used. Combine these two into a helper function.
Link: http://lkml.kernel.org/r/1497939652-16528-3-git-send-email-rppt@linux.vnet.i... Signed-off-by: Mike Rapoport rppt@linux.vnet.ibm.com Cc: "Kirill A. Shutemov" kirill.shutemov@linux.intel.com Cc: Andrea Arcangeli aarcange@redhat.com Cc: Hillf Danton hillf.zj@alibaba-inc.com Cc: Hugh Dickins hughd@google.com Cc: Pavel Emelyanov xemul@virtuozzo.com Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Linus Torvalds torvalds@linux-foundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- mm/shmem.c | 82 ++++++++++++++++++++++++++++-------------------------- 1 file changed, 42 insertions(+), 40 deletions(-)
diff --git a/mm/shmem.c b/mm/shmem.c index b26f11221ea8..e30ffaa065a4 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -181,6 +181,38 @@ 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) +{ + struct shmem_inode_info *info = SHMEM_I(inode); + struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb); + + if (shmem_acct_block(info->flags, pages)) + return false; + + if (sbinfo->max_blocks) { + if (percpu_counter_compare(&sbinfo->used_blocks, + sbinfo->max_blocks - pages) > 0) + goto unacct; + percpu_counter_add(&sbinfo->used_blocks, pages); + } + + return true; + +unacct: + shmem_unacct_blocks(info->flags, pages); + return false; +} + +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); + + if (sbinfo->max_blocks) + percpu_counter_sub(&sbinfo->used_blocks, pages); + shmem_unacct_blocks(info->flags, pages); +} + static const struct super_operations shmem_ops; static const struct address_space_operations shmem_aops; static const struct file_operations shmem_file_operations; @@ -237,31 +269,20 @@ static void shmem_recalc_inode(struct inode *inode)
freed = info->alloced - info->swapped - inode->i_mapping->nrpages; if (freed > 0) { - struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb); - if (sbinfo->max_blocks) - percpu_counter_add(&sbinfo->used_blocks, -freed); info->alloced -= freed; inode->i_blocks -= freed * BLOCKS_PER_PAGE; - shmem_unacct_blocks(info->flags, freed); + shmem_inode_unacct_blocks(inode, freed); } }
bool shmem_charge(struct inode *inode, long pages) { struct shmem_inode_info *info = SHMEM_I(inode); - struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb); unsigned long flags;
- if (shmem_acct_block(info->flags, pages)) + if (!shmem_inode_acct_block(inode, pages)) return false;
- if (sbinfo->max_blocks) { - if (percpu_counter_compare(&sbinfo->used_blocks, - sbinfo->max_blocks - pages) > 0) - goto unacct; - percpu_counter_add(&sbinfo->used_blocks, pages); - } - spin_lock_irqsave(&info->lock, flags); info->alloced += pages; inode->i_blocks += pages * BLOCKS_PER_PAGE; @@ -270,16 +291,11 @@ bool shmem_charge(struct inode *inode, long pages) inode->i_mapping->nrpages += pages;
return true; - -unacct: - shmem_unacct_blocks(info->flags, pages); - return false; }
void shmem_uncharge(struct inode *inode, long pages) { struct shmem_inode_info *info = SHMEM_I(inode); - struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb); unsigned long flags;
spin_lock_irqsave(&info->lock, flags); @@ -288,9 +304,7 @@ void shmem_uncharge(struct inode *inode, long pages) shmem_recalc_inode(inode); spin_unlock_irqrestore(&info->lock, flags);
- if (sbinfo->max_blocks) - percpu_counter_sub(&sbinfo->used_blocks, pages); - shmem_unacct_blocks(info->flags, pages); + shmem_inode_unacct_blocks(inode, pages); }
/* @@ -1423,9 +1437,10 @@ static struct page *shmem_alloc_page(gfp_t gfp, }
static struct page *shmem_alloc_and_acct_page(gfp_t gfp, - struct shmem_inode_info *info, struct shmem_sb_info *sbinfo, + struct inode *inode, pgoff_t index, bool huge) { + struct shmem_inode_info *info = SHMEM_I(inode); struct page *page; int nr; int err = -ENOSPC; @@ -1434,14 +1449,8 @@ static struct page *shmem_alloc_and_acct_page(gfp_t gfp, huge = false; nr = huge ? HPAGE_PMD_NR : 1;
- if (shmem_acct_block(info->flags, nr)) + if (!shmem_inode_acct_block(inode, nr)) goto failed; - if (sbinfo->max_blocks) { - if (percpu_counter_compare(&sbinfo->used_blocks, - sbinfo->max_blocks - nr) > 0) - goto unacct; - percpu_counter_add(&sbinfo->used_blocks, nr); - }
if (huge) page = shmem_alloc_hugepage(gfp, info, index); @@ -1454,10 +1463,7 @@ static struct page *shmem_alloc_and_acct_page(gfp_t gfp, }
err = -ENOMEM; - if (sbinfo->max_blocks) - percpu_counter_add(&sbinfo->used_blocks, -nr); -unacct: - shmem_unacct_blocks(info->flags, nr); + shmem_inode_unacct_blocks(inode, nr); failed: return ERR_PTR(err); } @@ -1717,10 +1723,9 @@ static int shmem_getpage_gfp(struct inode *inode, pgoff_t index, }
alloc_huge: - page = shmem_alloc_and_acct_page(gfp, info, sbinfo, - index, true); + page = shmem_alloc_and_acct_page(gfp, inode, index, true); if (IS_ERR(page)) { -alloc_nohuge: page = shmem_alloc_and_acct_page(gfp, info, sbinfo, +alloc_nohuge: page = shmem_alloc_and_acct_page(gfp, inode, index, false); } if (IS_ERR(page)) { @@ -1842,10 +1847,7 @@ alloc_nohuge: page = shmem_alloc_and_acct_page(gfp, info, sbinfo, * Error recovery. */ unacct: - if (sbinfo->max_blocks) - percpu_counter_sub(&sbinfo->used_blocks, - 1 << compound_order(page)); - shmem_unacct_blocks(info->flags, 1 << compound_order(page)); + shmem_inode_unacct_blocks(inode, 1 << compound_order(page));
if (PageTransHuge(page)) { unlock_page(page);