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authorYongqiang Yang <xiaoqiangnk@gmail.com>2011-07-26 21:35:44 -0400
committerTheodore Ts'o <tytso@mit.edu>2011-07-26 21:35:44 -0400
commit8f82f840ec6ab873f520364d443ff6fa1b3f8e22 (patch)
tree72d90cdc8f7311ef913b7471e53f718bebbf7414 /lib/sha1.c
parent2d859db3e4a82a365572592d57624a5f996ed0ec (diff)
downloadlinux-8f82f840ec6ab873f520364d443ff6fa1b3f8e22.tar.bz2
ext4: prevent parallel resizers by atomic bit ops
Before this patch, parallel resizers are allowed and protected by a mutex lock, actually, there is no need to support parallel resizer, so this patch prevents parallel resizers by atmoic bit ops, like lock_page() and unlock_page() do. To do this, the patch removed the mutex lock s_resize_lock from struct ext4_sb_info and added a unsigned long field named s_resize_flags which inidicates if there is a resizer. Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'lib/sha1.c')
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