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| author | Alexey Dobriyan <adobriyan@gmail.com> | 2016-12-13 01:45:32 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-12-13 03:55:09 +0100 |
| commit | 1270dd8d994039b677d0504ba7260873d608bf75 (patch) | |
| tree | ced0d62305e9cfa38afb22f6eed06e59e499763d /fs/proc/base.c | |
| parent | fs/proc/base.c: save decrement during lookup/readdir in /proc/$PID (diff) | |
| download | linux-1270dd8d994039b677d0504ba7260873d608bf75.tar.xz linux-1270dd8d994039b677d0504ba7260873d608bf75.zip | |
fs/proc: calculate /proc/* and /proc/*/task/* nlink at init time
Runtime nlink calculation works but meh. I don't know how to do it at
compile time, but I know how to do it at init time.
Shift "2+" part into init time as a bonus.
Link: http://lkml.kernel.org/r/20161122195549.GB29812@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Reviewed-by: Vegard Nossum <vegard.nossum@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/proc/base.c')
| -rw-r--r-- | fs/proc/base.c | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c index 04a5fcad4c34..9b99df4893a4 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -104,6 +104,9 @@ * in /proc for a task before it execs a suid executable. */ +static u8 nlink_tid; +static u8 nlink_tgid; + struct pid_entry { const char *name; unsigned int len; @@ -139,13 +142,13 @@ struct pid_entry { * Count the number of hardlinks for the pid_entry table, excluding the . * and .. links. */ -static unsigned int pid_entry_count_dirs(const struct pid_entry *entries, +static unsigned int __init pid_entry_nlink(const struct pid_entry *entries, unsigned int n) { unsigned int i; unsigned int count; - count = 0; + count = 2; for (i = 0; i < n; ++i) { if (S_ISDIR(entries[i].mode)) ++count; @@ -3068,8 +3071,7 @@ static int proc_pid_instantiate(struct inode *dir, inode->i_fop = &proc_tgid_base_operations; inode->i_flags|=S_IMMUTABLE; - set_nlink(inode, 2 + pid_entry_count_dirs(tgid_base_stuff, - ARRAY_SIZE(tgid_base_stuff))); + set_nlink(inode, nlink_tgid); d_set_d_op(dentry, &pid_dentry_operations); @@ -3361,8 +3363,7 @@ static int proc_task_instantiate(struct inode *dir, inode->i_fop = &proc_tid_base_operations; inode->i_flags|=S_IMMUTABLE; - set_nlink(inode, 2 + pid_entry_count_dirs(tid_base_stuff, - ARRAY_SIZE(tid_base_stuff))); + set_nlink(inode, nlink_tid); d_set_d_op(dentry, &pid_dentry_operations); @@ -3552,3 +3553,9 @@ static const struct file_operations proc_task_operations = { .iterate_shared = proc_task_readdir, .llseek = generic_file_llseek, }; + +void __init set_proc_pid_nlink(void) +{ + nlink_tid = pid_entry_nlink(tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); + nlink_tgid = pid_entry_nlink(tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); +} |