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btrfs: use predefined limits for calculating maximum number of pages for compression 

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2017-02-14 19:36:54 +01:00
parent ff7638665c
commit 069eac7850
1 changed files with 6 additions and 5 deletions
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11
fs/btrfs/inode.c
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@ -432,8 +432,6 @@ static noinline void compress_file_range(struct inode *inode,
unsigned long nr_pages;
unsigned long total_compressed = 0;
unsigned long total_in = 0;
unsigned long max_compressed = SZ_128K;
unsigned long max_uncompressed = SZ_128K;
int i;
int will_compress;
int compress_type = fs_info->compress_type;
@ -446,7 +444,9 @@ static noinline void compress_file_range(struct inode *inode,
again:
will_compress = 0;
nr_pages = (end >> PAGE_SHIFT) - (start >> PAGE_SHIFT) + 1;
nr_pages = min_t(unsigned long, nr_pages, SZ_128K / PAGE_SIZE);
BUILD_BUG_ON((BTRFS_MAX_COMPRESSED % PAGE_SIZE) != 0);
nr_pages = min_t(unsigned long, nr_pages,
BTRFS_MAX_COMPRESSED / PAGE_SIZE);
/*
* we don't want to send crud past the end of i_size through
@ -471,7 +471,8 @@ static noinline void compress_file_range(struct inode *inode,
(start > 0 || end + 1 < BTRFS_I(inode)->disk_i_size))
goto cleanup_and_bail_uncompressed;
total_compressed = min(total_compressed, max_uncompressed);
total_compressed = min_t(unsigned long, total_compressed,
BTRFS_MAX_UNCOMPRESSED);
num_bytes = ALIGN(end - start + 1, blocksize);
num_bytes = max(blocksize, num_bytes);
total_in = 0;
@ -510,7 +511,7 @@ static noinline void compress_file_range(struct inode *inode,
&nr_pages,
&total_in,
&total_compressed,
max_compressed);
BTRFS_MAX_COMPRESSED);
if (!ret) {
unsigned long offset = total_compressed &