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Updated linux/kernel/api/vfs_stat

dyokunev 8 anos atrás
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d438deea81
1 arquivos alterados com 63 adições e 0 exclusões
  1. 63 0
      linux/kernel/api/vfs_stat.md

+ 63 - 0
linux/kernel/api/vfs_stat.md

@@ -0,0 +1,63 @@
+I don't know if this correct or not, but:
+
+```
+#include
+vfs_stat ( char *path, struct kstat *kstat )
+```
+
+`vfs_stat()` — retrieve information about the file pointed to by `path`.
+
+About `struct kstat` see [https://docs.oracle.com/cd/E53394_01/html/E54769/kstat-3kstat.html](https://docs.oracle.com/cd/E53394_01/html/E54769/kstat-3kstat.html) and file linux-source/include/linux/stat.h:
+```
+#include <asm/stat.h>
+#include <uapi/linux/stat.h>
+
+#define S_IRWXUGO       (S_IRWXU|S_IRWXG|S_IRWXO)
+#define S_IALLUGO       (S_ISUID|S_ISGID|S_ISVTX|S_IRWXUGO)
+#define S_IRUGO         (S_IRUSR|S_IRGRP|S_IROTH)
+#define S_IWUGO         (S_IWUSR|S_IWGRP|S_IWOTH)
+#define S_IXUGO         (S_IXUSR|S_IXGRP|S_IXOTH)
+
+#define UTIME_NOW       ((1l << 30) - 1l)
+#define UTIME_OMIT      ((1l << 30) - 2l)
+
+#include <linux/types.h>
+#include <linux/time.h>
+#include <linux/uidgid.h>
+
+struct kstat {
+        u64             ino;
+        dev_t           dev;
+        umode_t         mode;
+        unsigned int    nlink;
+        kuid_t          uid;
+        kgid_t          gid;
+        dev_t           rdev;
+        loff_t          size;
+        struct timespec  atime;
+        struct timespec mtime;
+        struct timespec ctime;
+        unsigned long   blksize;
+        unsigned long long      blocks;
+};
+```
+
+Function source code: http://lxr.linux.no/linux+v4.6.4/fs/stat.c#L121
+
+Example:
+
+```
+int file_stat ( char *fpath, struct kstat stat )
+{
+        int error;
+        mm_segment_t old_fs;
+
+        old_fs = get_fs();
+        set_fs(KERNEL_DS);
+
+        error = vfs_stat (fpath, &stat);
+        set_fs(old_fs);
+
+        return error;
+}
+```