From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Anand Jain <anand.jain@oracle.com>,
Nikolay Borisov <nborisov@suse.com>,
David Sterba <dsterba@suse.com>, Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.9 02/24] btrfs: cow_file_range() num_bytes and disk_num_bytes are same
Date: Tue, 7 Jul 2020 17:13:34 +0200 [thread overview]
Message-ID: <20200707145749.070771994@linuxfoundation.org> (raw)
In-Reply-To: <20200707145748.952502272@linuxfoundation.org>
From: Anand Jain <Anand.Jain@oracle.com>
[ Upstream commit 3752d22fcea160cc2493e34f5e0e41cdd7fdd921 ]
This patch deletes local variable disk_num_bytes as its value
is same as num_bytes in the function cow_file_range().
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/btrfs/inode.c | 17 ++++++++---------
1 file changed, 8 insertions(+), 9 deletions(-)
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index c425443c31fea..6d63050abe214 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -947,7 +947,6 @@ static noinline int cow_file_range(struct inode *inode,
u64 alloc_hint = 0;
u64 num_bytes;
unsigned long ram_size;
- u64 disk_num_bytes;
u64 cur_alloc_size;
u64 blocksize = root->sectorsize;
struct btrfs_key ins;
@@ -963,7 +962,6 @@ static noinline int cow_file_range(struct inode *inode,
num_bytes = ALIGN(end - start + 1, blocksize);
num_bytes = max(blocksize, num_bytes);
- disk_num_bytes = num_bytes;
/* if this is a small write inside eof, kick off defrag */
if (num_bytes < SZ_64K &&
@@ -992,16 +990,15 @@ static noinline int cow_file_range(struct inode *inode,
}
}
- BUG_ON(disk_num_bytes >
- btrfs_super_total_bytes(root->fs_info->super_copy));
+ BUG_ON(num_bytes > btrfs_super_total_bytes(root->fs_info->super_copy));
alloc_hint = get_extent_allocation_hint(inode, start, num_bytes);
btrfs_drop_extent_cache(inode, start, start + num_bytes - 1, 0);
- while (disk_num_bytes > 0) {
+ while (num_bytes > 0) {
unsigned long op;
- cur_alloc_size = disk_num_bytes;
+ cur_alloc_size = num_bytes;
ret = btrfs_reserve_extent(root, cur_alloc_size, cur_alloc_size,
root->sectorsize, 0, alloc_hint,
&ins, 1, 1);
@@ -1058,7 +1055,7 @@ static noinline int cow_file_range(struct inode *inode,
btrfs_dec_block_group_reservations(root->fs_info, ins.objectid);
- if (disk_num_bytes < cur_alloc_size)
+ if (num_bytes < cur_alloc_size)
break;
/* we're not doing compressed IO, don't unlock the first
@@ -1076,8 +1073,10 @@ static noinline int cow_file_range(struct inode *inode,
delalloc_end, locked_page,
EXTENT_LOCKED | EXTENT_DELALLOC,
op);
- disk_num_bytes -= cur_alloc_size;
- num_bytes -= cur_alloc_size;
+ if (num_bytes < cur_alloc_size)
+ num_bytes = 0;
+ else
+ num_bytes -= cur_alloc_size;
alloc_hint = ins.objectid + ins.offset;
start += cur_alloc_size;
}
--
2.25.1
next prev parent reply other threads:[~2020-07-07 15:14 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-07 15:13 [PATCH 4.9 00/24] 4.9.230-rc1 review Greg Kroah-Hartman
2020-07-07 15:13 ` [PATCH 4.9 01/24] btrfs: fix a block group ref counter leak after failure to remove block group Greg Kroah-Hartman
2020-07-07 15:13 ` Greg Kroah-Hartman [this message]
2020-07-07 15:13 ` [PATCH 4.9 03/24] btrfs: fix data block group relocation failure due to concurrent scrub Greg Kroah-Hartman
2020-07-07 15:13 ` [PATCH 4.9 04/24] mm: fix swap cache node allocation mask Greg Kroah-Hartman
2020-07-07 15:13 ` [PATCH 4.9 05/24] EDAC/amd64: Read back the scrub rate PCI register on F15h Greg Kroah-Hartman
2020-07-07 15:13 ` [PATCH 4.9 06/24] usbnet: smsc95xx: Fix use-after-free after removal Greg Kroah-Hartman
2020-07-07 15:13 ` [PATCH 4.9 07/24] mm/slub.c: fix corrupted freechain in deactivate_slab() Greg Kroah-Hartman
2020-07-07 15:13 ` [PATCH 4.9 08/24] mm/slub: fix stack overruns with SLUB_STATS Greg Kroah-Hartman
2020-07-07 15:13 ` [PATCH 4.9 09/24] usb: usbtest: fix missing kfree(dev->buf) in usbtest_disconnect Greg Kroah-Hartman
2020-07-07 15:13 ` [PATCH 4.9 10/24] kgdb: Avoid suspicious RCU usage warning Greg Kroah-Hartman
2020-07-07 15:13 ` [PATCH 4.9 11/24] crypto: af_alg - fix use-after-free in af_alg_accept() due to bh_lock_sock() Greg Kroah-Hartman
2020-07-07 15:13 ` [PATCH 4.9 12/24] sched/rt: Show the sched_rr_timeslice SCHED_RR timeslice tuning knob in milliseconds Greg Kroah-Hartman
2020-07-07 15:13 ` [PATCH 4.9 13/24] cxgb4: parse TC-U32 key values and masks natively Greg Kroah-Hartman
2020-07-07 15:13 ` [PATCH 4.9 14/24] hwmon: (max6697) Make sure the OVERT mask is set correctly Greg Kroah-Hartman
2020-07-07 15:13 ` [PATCH 4.9 15/24] hwmon: (acpi_power_meter) Fix potential memory leak in acpi_power_meter_add() Greg Kroah-Hartman
2020-07-07 15:13 ` [PATCH 4.9 16/24] virtio-blk: free vblk-vqs in error path of virtblk_probe() Greg Kroah-Hartman
2020-07-07 15:13 ` [PATCH 4.9 17/24] i2c: algo-pca: Add 0x78 as SCL stuck low status for PCA9665 Greg Kroah-Hartman
2020-07-07 15:13 ` [PATCH 4.9 18/24] Revert "ALSA: usb-audio: Improve frames size computation" Greg Kroah-Hartman
2020-07-07 15:13 ` [PATCH 4.9 19/24] SMB3: Honor seal flag for multiuser mounts Greg Kroah-Hartman
2020-07-07 15:13 ` [PATCH 4.9 20/24] SMB3: Honor persistent/resilient handle flags " Greg Kroah-Hartman
2020-07-07 15:13 ` [PATCH 4.9 21/24] cifs: Fix the target file was deleted when rename failed Greg Kroah-Hartman
2020-07-07 15:13 ` [PATCH 4.9 22/24] MIPS: Add missing EHB in mtc0 -> mfc0 sequence for DSPen Greg Kroah-Hartman
2020-07-07 15:13 ` [PATCH 4.9 23/24] netfilter: nf_conntrack_h323: lost .data_len definition for Q.931/ipv6 Greg Kroah-Hartman
2020-07-07 15:13 ` [PATCH 4.9 24/24] efi: Make it possible to disable efivar_ssdt entirely Greg Kroah-Hartman
2020-07-08 6:38 ` [PATCH 4.9 00/24] 4.9.230-rc1 review Naresh Kamboju
2020-07-08 8:40 ` Jon Hunter
2020-07-08 15:13 ` Shuah Khan
2020-07-08 17:51 ` Guenter Roeck
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