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cf38fadade
Shorten it, "finding" it is an implementation detail, what callers want is the pathname, not to ask for it to _always_ do the lookup. And the existing implementation already caches it, i.e. it doesn't "finds" it on every call. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-r24wa4bvtccg7mnkessrbbdj@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
108 lines
1.7 KiB
C
108 lines
1.7 KiB
C
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/* TODO merge/factor into tools/lib/lk/debugfs.c */
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#include "util.h"
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#include "util/fs.h"
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static const char * const sysfs__fs_known_mountpoints[] = {
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"/sys",
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0,
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};
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struct fs {
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const char *name;
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const char * const *mounts;
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char path[PATH_MAX + 1];
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bool found;
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long magic;
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};
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enum {
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FS__SYSFS = 0,
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};
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static struct fs fs__entries[] = {
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[FS__SYSFS] = {
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.name = "sysfs",
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.mounts = sysfs__fs_known_mountpoints,
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.magic = SYSFS_MAGIC,
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},
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};
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static bool fs__read_mounts(struct fs *fs)
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{
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bool found = false;
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char type[100];
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FILE *fp;
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fp = fopen("/proc/mounts", "r");
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if (fp == NULL)
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return NULL;
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while (!found &&
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fscanf(fp, "%*s %" STR(PATH_MAX) "s %99s %*s %*d %*d\n",
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fs->path, type) == 2) {
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if (strcmp(type, fs->name) == 0)
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found = true;
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}
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fclose(fp);
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return fs->found = found;
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}
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static int fs__valid_mount(const char *fs, long magic)
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{
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struct statfs st_fs;
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if (statfs(fs, &st_fs) < 0)
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return -ENOENT;
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else if (st_fs.f_type != magic)
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return -ENOENT;
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return 0;
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}
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static bool fs__check_mounts(struct fs *fs)
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{
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const char * const *ptr;
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ptr = fs->mounts;
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while (*ptr) {
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if (fs__valid_mount(*ptr, fs->magic) == 0) {
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fs->found = true;
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strcpy(fs->path, *ptr);
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return true;
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}
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ptr++;
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}
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return false;
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}
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static const char *fs__get_mountpoint(struct fs *fs)
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{
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if (fs__check_mounts(fs))
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return fs->path;
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return fs__read_mounts(fs) ? fs->path : NULL;
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}
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static const char *fs__mountpoint(int idx)
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{
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struct fs *fs = &fs__entries[idx];
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if (fs->found)
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return (const char *)fs->path;
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return fs__get_mountpoint(fs);
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}
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#define FS__MOUNTPOINT(name, idx) \
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const char *name##__mountpoint(void) \
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{ \
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return fs__mountpoint(idx); \
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}
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FS__MOUNTPOINT(sysfs, FS__SYSFS);
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