Richard W.M. Jones
11 years ago
parent
03ba43f400
commit
b3c10803a2
@ -0,0 +1,217 @@
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From c26a519da1ed182e7cfd67e7a353932dda53d811 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Jean-Pierre=20Andr=C3=A9?= <jpandre@users.sourceforge.net>
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Date: Mon, 4 Aug 2014 17:39:50 +0200
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Subject: [PATCH] Fixed fstrim(8) applied to partitions
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The new way goes via /sys/dev/block/MAJOR:MINOR to map partitions to
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devices and get discard parameters of the parent device. It also ensures
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that the partition is aligned to the discard block size.
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Contributed by Richard W.M. Jones
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---
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libntfs-3g/ioctl.c | 140 ++++++++++++++++++++++++++---------------------------
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1 file changed, 68 insertions(+), 72 deletions(-)
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diff --git a/libntfs-3g/ioctl.c b/libntfs-3g/ioctl.c
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index bbbceb9..eb7c8e7 100644
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--- a/libntfs-3g/ioctl.c
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+++ b/libntfs-3g/ioctl.c
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@@ -66,8 +66,6 @@
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#include <linux/fs.h>
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#endif
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-#include <dirent.h>
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-
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#include "compat.h"
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#include "debug.h"
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#include "bitmap.h"
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@@ -135,17 +133,14 @@ static int read_u64(const char *path, u64 *n)
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}
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/* Find discard limits for current backing device.
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- * XXX Kernel makes this a pain in the neck.
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*/
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-static int fstrim_limits(ntfs_volume *vol, u64 *discard_granularity,
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+static int fstrim_limits(ntfs_volume *vol,
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+ u64 *discard_alignment,
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+ u64 *discard_granularity,
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u64 *discard_max_bytes)
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{
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struct stat statbuf;
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- DIR *dir;
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- struct dirent *d;
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- char path[80];
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- char line[64];
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- char dev[64];
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+ char path1[80], path2[80];
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int ret;
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/* Stat the backing device. Caller has ensured it is a block device. */
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@@ -155,82 +150,78 @@ static int fstrim_limits(ntfs_volume *vol, u64 *discard_granularity,
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return -errno;
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}
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- /* Now look for a /sys/block/<dev>/dev file which contains
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- * "major:minor\n".
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+ /* For whole devices,
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+ * /sys/dev/block/MAJOR:MINOR/discard_alignment
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+ * /sys/dev/block/MAJOR:MINOR/queue/discard_granularity
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+ * /sys/dev/block/MAJOR:MINOR/queue/discard_max_bytes
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+ * will exist.
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+ * For partitions, we also need to check the parent device:
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+ * /sys/dev/block/MAJOR:MINOR/../queue/discard_granularity
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+ * /sys/dev/block/MAJOR:MINOR/../queue/discard_max_bytes
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*/
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- snprintf(dev, sizeof dev, "%d:%d\n",
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+ snprintf(path1, sizeof path1, "/sys/dev/block/%d:%d",
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major(statbuf.st_rdev), minor(statbuf.st_rdev));
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- dir = opendir("/sys/block");
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- if (dir == NULL) {
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- ntfs_log_debug("fstrim_limits: could not open /sys/block\n");
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- return -errno;
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+ snprintf(path2, sizeof path2, "%s/discard_alignment", path1);
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+ ret = read_u64(path2, discard_alignment);
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+ if (ret) {
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+ if (ret != -ENOENT)
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+ return ret;
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+ else
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+ /* We would expect this file to exist on all
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+ * modern kernels. But for the sake of very
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+ * old kernels:
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+ */
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+ goto not_found;
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}
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- for (;;) {
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- errno = 0;
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- d = readdir(dir);
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- if (!d) break;
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- snprintf(path, sizeof path, "/sys/block/%s/dev", d->d_name);
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- ret = read_line(path, line, sizeof line);
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- if (ret)
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- continue;
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- if (strcmp(line, dev) == 0)
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- goto found;
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+ snprintf(path2, sizeof path2, "%s/queue/discard_granularity", path1);
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+ ret = read_u64(path2, discard_granularity);
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+ if (ret) {
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+ if (ret != -ENOENT)
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+ return ret;
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+ else {
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+ snprintf(path2, sizeof path2,
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+ "%s/../queue/discard_granularity", path1);
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+ ret = read_u64(path2, discard_granularity);
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+ if (ret) {
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+ if (ret != -ENOENT)
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+ return ret;
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+ else
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+ goto not_found;
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+ }
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+ }
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}
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- /* Check readdir didn't fail. */
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- if (errno != 0) {
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- ret = -errno;
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- ntfs_log_debug("fstrim_limits: readdir failed\n");
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- goto out;
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+ snprintf(path2, sizeof path2, "%s/queue/discard_max_bytes", path1);
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+ ret = read_u64(path2, discard_max_bytes);
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+ if (ret) {
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+ if (ret != -ENOENT)
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+ return ret;
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+ else {
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+ snprintf(path2, sizeof path2,
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+ "%s/../queue/discard_max_bytes", path1);
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+ ret = read_u64(path2, discard_max_bytes);
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+ if (ret) {
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+ if (ret != -ENOENT)
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+ return ret;
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+ else
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+ goto not_found;
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+ }
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+ }
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}
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+ return 0;
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+
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+not_found:
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/* If we reach here then we didn't find the device. This is
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* not an error, but set discard_max_bytes = 0 to indicate
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* that discard is not available.
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*/
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+ *discard_alignment = 0;
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*discard_granularity = 0;
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*discard_max_bytes = 0;
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- ntfs_log_debug("fstrim_limits: /sys/block entry corresponding to device %s not found\n",
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- vol->dev->d_name);
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- ret = 0;
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- goto out;
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-
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-found:
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- /* Found the device at /sys/block/ + d->d_name */
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- snprintf (path, sizeof path,
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- "/sys/block/%s/queue/discard_granularity",
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- d->d_name);
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- ret = read_u64(path, discard_granularity);
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- if (ret) {
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- ntfs_log_debug("fstrim_limits: could not read %s\n", path);
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- goto out;
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- }
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-
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- snprintf (path, sizeof path,
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- "/sys/block/%s/queue/discard_max_bytes",
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- d->d_name);
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- ret = read_u64(path, discard_max_bytes);
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- if (ret) {
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- ntfs_log_debug("fstrim_limits: could not read %s\n", path);
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- goto out;
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- }
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-
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- ntfs_log_debug("fstrim_limits: device %s discard granularity = %llu max_bytes = %llu\n",
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- d->d_name,
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- (unsigned long long) *discard_granularity,
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- (unsigned long long) *discard_max_bytes);
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-
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- ret = 0;
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-out:
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- if (closedir (dir) == -1) {
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- ret = -errno;
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- ntfs_log_debug("fstrim_limits: closedir failed\n");
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- return ret;
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- }
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-
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- return ret;
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+ return 0;
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}
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#define FSTRIM_BUFSIZ 4096
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@@ -247,7 +238,7 @@ static int fstrim(ntfs_volume *vol, void *data)
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u64 start = range->start;
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u64 len = range->len;
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u64 minlen = range->minlen;
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- u64 discard_granularity, discard_max_bytes;
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+ u64 discard_alignment, discard_granularity, discard_max_bytes;
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u8 *buf = NULL;
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LCN start_buf;
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int ret;
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@@ -279,9 +270,14 @@ static int fstrim(ntfs_volume *vol, void *data)
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return -EOPNOTSUPP;
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}
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- ret = fstrim_limits(vol, &discard_granularity, &discard_max_bytes);
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+ ret = fstrim_limits(vol, &discard_alignment,
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+ &discard_granularity, &discard_max_bytes);
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if (ret)
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return ret;
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+ if (discard_alignment != 0) {
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+ ntfs_log_debug("fstrim: backing device is not aligned for discards\n");
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+ return -EOPNOTSUPP;
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+ }
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if (discard_granularity > vol->cluster_size) {
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ntfs_log_debug("fstrim: discard granularity of backing device is larger than cluster size\n");
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return -EOPNOTSUPP;
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--
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1.9.3
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