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authorDominik Brodowski <linux@dominikbrodowski.net>2018-03-13 23:51:17 +0300
committerDominik Brodowski <linux@dominikbrodowski.net>2018-04-02 21:16:03 +0300
commit76847e4344350970e1c2e27c28b5abb3c588c5b3 (patch)
tree3562d369e5299a200ae49fd42e5b6084a594cf2f /init
parentcbb60b924b9f3e4d7c67a1c9dcf981718f926e4e (diff)
downloadlinux-76847e4344350970e1c2e27c28b5abb3c588c5b3.tar.xz
fs: add ksys_lseek() helper; remove in-kernel calls to sys_lseek()
Using this helper allows us to avoid the in-kernel calls to the sys_lseek() syscall. The ksys_ prefix denotes that this function is meant as a drop-in replacement for the syscall. In particular, it uses the same calling convention as sys_lseek(). This patch is part of a series which removes in-kernel calls to syscalls. On this basis, the syscall entry path can be streamlined. For details, see http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net Cc: Alexander Viro <viro@zeniv.linux.org.uk> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Diffstat (limited to 'init')
-rw-r--r--init/do_mounts_rd.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/init/do_mounts_rd.c b/init/do_mounts_rd.c
index 4dafaed5736f..13e54148c0e0 100644
--- a/init/do_mounts_rd.c
+++ b/init/do_mounts_rd.c
@@ -90,7 +90,7 @@ identify_ramdisk_image(int fd, int start_block, decompress_fn *decompressor)
/*
* Read block 0 to test for compressed kernel
*/
- sys_lseek(fd, start_block * BLOCK_SIZE, 0);
+ ksys_lseek(fd, start_block * BLOCK_SIZE, 0);
sys_read(fd, buf, size);
*decompressor = decompress_method(buf, size, &compress_name);
@@ -136,7 +136,7 @@ identify_ramdisk_image(int fd, int start_block, decompress_fn *decompressor)
/*
* Read 512 bytes further to check if cramfs is padded
*/
- sys_lseek(fd, start_block * BLOCK_SIZE + 0x200, 0);
+ ksys_lseek(fd, start_block * BLOCK_SIZE + 0x200, 0);
sys_read(fd, buf, size);
if (cramfsb->magic == CRAMFS_MAGIC) {
@@ -150,7 +150,7 @@ identify_ramdisk_image(int fd, int start_block, decompress_fn *decompressor)
/*
* Read block 1 to test for minix and ext2 superblock
*/
- sys_lseek(fd, (start_block+1) * BLOCK_SIZE, 0);
+ ksys_lseek(fd, (start_block+1) * BLOCK_SIZE, 0);
sys_read(fd, buf, size);
/* Try minix */
@@ -178,7 +178,7 @@ identify_ramdisk_image(int fd, int start_block, decompress_fn *decompressor)
start_block);
done:
- sys_lseek(fd, start_block * BLOCK_SIZE, 0);
+ ksys_lseek(fd, start_block * BLOCK_SIZE, 0);
kfree(buf);
return nblocks;
}