From 26b0d2e1a1606da10c4dc4e109d7b9f2d92aab6a Mon Sep 17 00:00:00 2001 From: Eric Wong Date: Thu, 29 May 2014 09:41:29 +0530 Subject: Avoid stat/fstat in statvfs/fstatvfs (BZ #15132) Delay the use of stat/fstat until stat data is required. When the kernel returns ST_VALID, stat data is not used by __internal_statvfs. --- sysdeps/unix/sysv/linux/fstatvfs.c | 4 ++-- sysdeps/unix/sysv/linux/fstatvfs64.c | 10 +++------- sysdeps/unix/sysv/linux/internal_statvfs.c | 15 ++++++++------- sysdeps/unix/sysv/linux/statvfs.c | 6 ++---- sysdeps/unix/sysv/linux/statvfs64.c | 10 +++------- 5 files changed, 18 insertions(+), 27 deletions(-) (limited to 'sysdeps') diff --git a/sysdeps/unix/sysv/linux/fstatvfs.c b/sysdeps/unix/sysv/linux/fstatvfs.c index da1f27e..689ab7a 100644 --- a/sysdeps/unix/sysv/linux/fstatvfs.c +++ b/sysdeps/unix/sysv/linux/fstatvfs.c @@ -22,7 +22,7 @@ #include extern void __internal_statvfs (const char *name, struct statvfs *buf, - struct statfs *fsbuf, struct stat64 *st); + struct statfs *fsbuf, int fd); int @@ -36,7 +36,7 @@ fstatvfs (int fd, struct statvfs *buf) return -1; /* Convert the result. */ - __internal_statvfs (NULL, buf, &fsbuf, fstat64 (fd, &st) == -1 ? NULL : &st); + __internal_statvfs (NULL, buf, &fsbuf, fd); /* We signal success if the statfs call succeeded. */ return 0; diff --git a/sysdeps/unix/sysv/linux/fstatvfs64.c b/sysdeps/unix/sysv/linux/fstatvfs64.c index dd10c1f..006b059 100644 --- a/sysdeps/unix/sysv/linux/fstatvfs64.c +++ b/sysdeps/unix/sysv/linux/fstatvfs64.c @@ -25,7 +25,7 @@ extern void __internal_statvfs64 (const char *name, struct statvfs64 *buf, - struct statfs64 *fsbuf, struct stat64 *st); + struct statfs64 *fsbuf, int fd); /* Return information about the filesystem on which FD resides. */ @@ -60,12 +60,8 @@ __fstatvfs64 (int fd, struct statvfs64 *buf) #endif if (res == 0) - { - /* Convert the result. */ - struct stat64 st; - __internal_statvfs64 (NULL, buf, &fsbuf, - fstat64 (fd, &st) == -1 ? NULL : &st); - } + /* Convert the result. */ + __internal_statvfs64 (NULL, buf, &fsbuf, fd); return res; } diff --git a/sysdeps/unix/sysv/linux/internal_statvfs.c b/sysdeps/unix/sysv/linux/internal_statvfs.c index 2424c13..d71ed0c 100644 --- a/sysdeps/unix/sysv/linux/internal_statvfs.c +++ b/sysdeps/unix/sysv/linux/internal_statvfs.c @@ -43,9 +43,11 @@ # ifndef __ASSUME_STATFS_F_FLAGS int -__statvfs_getflags (const char *name, int fstype, struct stat64 *st) +__statvfs_getflags (const char *name, int fstype, int fd) { - if (st == NULL) + struct stat64 st; + + if ((fd < 0 ? stat64 (name, &st) : fstat64 (fd, &st)) < 0) return 0; const char *fsname = NULL; @@ -159,7 +161,7 @@ __statvfs_getflags (const char *name, int fstype, struct stat64 *st) /* Find out about the device the current entry is for. */ struct stat64 fsst; if (stat64 (mntbuf.mnt_dir, &fsst) >= 0 - && st->st_dev == fsst.st_dev) + && st.st_dev == fsst.st_dev) { /* Bingo, we found the entry for the device FD is on. Now interpret the option string. */ @@ -222,14 +224,13 @@ __statvfs_getflags (const char *name, int fstype, struct stat64 *st) } # endif #else -extern int __statvfs_getflags (const char *name, int fstype, - struct stat64 *st); +extern int __statvfs_getflags (const char *name, int fstype, int fd); #endif void INTERNAL_STATVFS (const char *name, struct STATVFS *buf, - struct STATFS *fsbuf, struct stat64 *st) + struct STATFS *fsbuf, int fd) { /* Now fill in the fields we have information for. */ buf->f_bsize = fsbuf->f_bsize; @@ -272,7 +273,7 @@ INTERNAL_STATVFS (const char *name, struct STATVFS *buf, the /etc/mtab file and search for the entry which matches the given file. The way we can test for matching filesystem is using the device number. */ - buf->f_flag = __statvfs_getflags (name, fsbuf->f_type, st); + buf->f_flag = __statvfs_getflags (name, fsbuf->f_type, fd); else #endif buf->f_flag = fsbuf->f_flags ^ ST_VALID; diff --git a/sysdeps/unix/sysv/linux/statvfs.c b/sysdeps/unix/sysv/linux/statvfs.c index 8a3df97..1427961 100644 --- a/sysdeps/unix/sysv/linux/statvfs.c +++ b/sysdeps/unix/sysv/linux/statvfs.c @@ -22,22 +22,20 @@ #include extern void __internal_statvfs (const char *name, struct statvfs *buf, - struct statfs *fsbuf, struct stat64 *st); + struct statfs *fsbuf, int fd); int statvfs (const char *file, struct statvfs *buf) { struct statfs fsbuf; - struct stat64 st; /* Get as much information as possible from the system. */ if (__statfs (file, &fsbuf) < 0) return -1; /* Convert the result. */ - __internal_statvfs (file, buf, &fsbuf, - stat64 (file, &st) == -1 ? NULL : &st); + __internal_statvfs (file, buf, &fsbuf, -1); /* We signal success if the statfs call succeeded. */ return 0; diff --git a/sysdeps/unix/sysv/linux/statvfs64.c b/sysdeps/unix/sysv/linux/statvfs64.c index e33e923..0ec8524 100644 --- a/sysdeps/unix/sysv/linux/statvfs64.c +++ b/sysdeps/unix/sysv/linux/statvfs64.c @@ -26,7 +26,7 @@ extern void __internal_statvfs64 (const char *name, struct statvfs64 *buf, - struct statfs64 *fsbuf, struct stat64 *st); + struct statfs64 *fsbuf, int fd); /* Return information about the filesystem on which FILE resides. */ @@ -61,12 +61,8 @@ __statvfs64 (const char *file, struct statvfs64 *buf) #endif if (res == 0) - { - /* Convert the result. */ - struct stat64 st; - __internal_statvfs64 (file, buf, &fsbuf, - stat64 (file, &st) == -1 ? NULL : &st); - } + /* Convert the result. */ + __internal_statvfs64 (file, buf, &fsbuf, -1); return res; } -- cgit v1.1