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util-linux.6436
util-linux-loop-reuse-04.patch
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File util-linux-loop-reuse-04.patch of Package util-linux.6436
From 74a4705a993ce475d95c1c20d0cc4eb740b0c933 Mon Sep 17 00:00:00 2001 From: Stanislav Brabec <sbrabec@suse.cz> Date: Thu, 14 Jul 2016 15:29:09 +0200 Subject: [PATCH 4/20] Add sizelimit to internal API Fully safe checks of loop device need to check sizelimit. To prevent need of two nearly equal functions, introduce sizelimit parameter to several internal functions: loopdev_is_used() loopdev_find_by_backing_file() loopcxt_is_used() loopcxt_find_by_backing_file() If sizelimit is zero, fall back to the old behavior (ignoring of sizelimit). Signed-off-by: Stanislav Brabec <sbrabec@suse.cz> --- include/loopdev.h | 8 +++++--- lib/ismounted.c | 2 +- lib/loopdev.c | 26 +++++++++++++++++++------- libmount/src/context_loopdev.c | 6 +++--- libmount/src/context_umount.c | 2 +- libmount/src/tab.c | 2 +- sys-utils/losetup.c | 8 ++++---- 7 files changed, 34 insertions(+), 20 deletions(-) Index: util-linux-2.28/include/loopdev.h =================================================================== --- util-linux-2.28.orig/include/loopdev.h +++ util-linux-2.28/include/loopdev.h @@ -135,9 +135,9 @@ extern int loopdev_is_autoclear(const ch extern char *loopdev_get_backing_file(const char *device); extern int loopdev_is_used(const char *device, const char *filename, - uint64_t offset, int flags); + uint64_t offset, uint64_t sizelimit, int flags); extern char *loopdev_find_by_backing_file(const char *filename, - uint64_t offset, int flags); + uint64_t offset, uint64_t sizelimit, int flags); extern int loopcxt_find_unused(struct loopdev_cxt *lc); extern int loopdev_delete(const char *device); extern int loopdev_count_by_backing_file(const char *filename, char **loopdev); @@ -189,12 +189,14 @@ extern int loopcxt_is_dio(struct loopdev extern int loopcxt_is_partscan(struct loopdev_cxt *lc); extern int loopcxt_find_by_backing_file(struct loopdev_cxt *lc, const char *filename, - uint64_t offset, int flags); + uint64_t offset, uint64_t sizelimit, + int flags); extern int loopcxt_is_used(struct loopdev_cxt *lc, struct stat *st, const char *backing_file, uint64_t offset, + uint64_t sizelimit, int flags); #endif /* UTIL_LINUX_LOOPDEV_H */ Index: util-linux-2.28/lib/ismounted.c =================================================================== --- util-linux-2.28.orig/lib/ismounted.c +++ util-linux-2.28/lib/ismounted.c @@ -85,7 +85,7 @@ static int check_mntent_file(const char /* maybe the file is loopdev backing file */ if (file_dev && major(st_buf.st_rdev) == LOOPDEV_MAJOR - && loopdev_is_used(mnt->mnt_fsname, file, 0, 0)) + && loopdev_is_used(mnt->mnt_fsname, file, 0, 0, 0)) break; #endif /* __linux__ */ #endif /* __GNU__ */ Index: util-linux-2.28/lib/loopdev.c =================================================================== --- util-linux-2.28.orig/lib/loopdev.c +++ util-linux-2.28/lib/loopdev.c @@ -979,12 +979,15 @@ int loopcxt_is_dio(struct loopdev_cxt *l * @backing_file: filename * @offset: offset * @flags: LOOPDEV_FL_OFFSET if @offset should not be ignored + * @flags: LOOPDEV_FL_SIZELIMIT if @sizelimit should not be ignored * * Returns 1 if the current @lc loopdev is associated with the given backing * file. Note that the preferred way is to use devno and inode number rather * than filename. The @backing_file filename is poor solution usable in case * that you don't have rights to call stat(). * + * LOOPDEV_FL_SIZELIMIT requires LOOPDEV_FL_OFFSET being set as well. + * * Don't forget that old kernels provide very restricted (in size) backing * filename by LOOP_GET_STAT64 ioctl only. */ @@ -992,6 +995,7 @@ int loopcxt_is_used(struct loopdev_cxt * struct stat *st, const char *backing_file, uint64_t offset, + uint64_t sizelimit, int flags) { ino_t ino; @@ -1029,7 +1033,15 @@ found: if (flags & LOOPDEV_FL_OFFSET) { uint64_t off; - return loopcxt_get_offset(lc, &off) == 0 && off == offset; + int rc = loopcxt_get_offset(lc, &off) == 0 && off == offset; + + if (rc && flags & LOOPDEV_FL_SIZELIMIT) { + uint64_t sz; + + return loopcxt_get_sizelimit(lc, &sz) == 0 && sz == sizelimit; + } + else + return rc; } return 1; } @@ -1504,7 +1516,7 @@ char *loopdev_get_backing_file(const cha * Returns: TRUE/FALSE */ int loopdev_is_used(const char *device, const char *filename, - uint64_t offset, int flags) + uint64_t offset, uint64_t sizelimit, int flags) { struct loopdev_cxt lc; struct stat st; @@ -1520,7 +1532,7 @@ int loopdev_is_used(const char *device, return rc; rc = !stat(filename, &st); - rc = loopcxt_is_used(&lc, rc ? &st : NULL, filename, offset, flags); + rc = loopcxt_is_used(&lc, rc ? &st : NULL, filename, offset, sizelimit, flags); loopcxt_deinit(&lc); return rc; @@ -1547,7 +1559,7 @@ int loopdev_delete(const char *device) * Returns: 0 = success, < 0 error, 1 not found */ int loopcxt_find_by_backing_file(struct loopdev_cxt *lc, const char *filename, - uint64_t offset, int flags) + uint64_t offset, uint64_t sizelimit, int flags) { int rc, hasst; struct stat st; @@ -1564,7 +1576,7 @@ int loopcxt_find_by_backing_file(struct while ((rc = loopcxt_next(lc)) == 0) { if (loopcxt_is_used(lc, hasst ? &st : NULL, - filename, offset, flags)) + filename, offset, sizelimit, flags)) break; } @@ -1575,7 +1587,7 @@ int loopcxt_find_by_backing_file(struct /* * Returns allocated string with device name */ -char *loopdev_find_by_backing_file(const char *filename, uint64_t offset, int flags) +char *loopdev_find_by_backing_file(const char *filename, uint64_t offset, uint64_t sizelimit, int flags) { struct loopdev_cxt lc; char *res = NULL; @@ -1585,7 +1597,7 @@ char *loopdev_find_by_backing_file(const if (loopcxt_init(&lc, 0)) return NULL; - if (loopcxt_find_by_backing_file(&lc, filename, offset, flags) == 0) + if (loopcxt_find_by_backing_file(&lc, filename, offset, sizelimit, flags) == 0) res = loopcxt_strdup_device(&lc); loopcxt_deinit(&lc); Index: util-linux-2.28/libmount/src/context_loopdev.c =================================================================== --- util-linux-2.28.orig/libmount/src/context_loopdev.c +++ util-linux-2.28/libmount/src/context_loopdev.c @@ -119,13 +119,13 @@ is_mounted_same_loopfile(struct libmnt_c rc = 0; if (strncmp(src, "/dev/loop", 9) == 0) { - rc = loopdev_is_used((char *) src, bf, offset, LOOPDEV_FL_OFFSET); + rc = loopdev_is_used((char *) src, bf, offset, 0, LOOPDEV_FL_OFFSET); } else if (opts && (cxt->user_mountflags & MNT_MS_LOOP) && mnt_optstr_get_option(opts, "loop", &val, &len) == 0 && val) { val = strndup(val, len); - rc = loopdev_is_used((char *) val, bf, offset, LOOPDEV_FL_OFFSET); + rc = loopdev_is_used((char *) val, bf, offset, 0, LOOPDEV_FL_OFFSET); free(val); } } @@ -219,7 +219,7 @@ int mnt_context_setup_loopdev(struct lib if (rc) goto done_no_deinit; if (backing_file && !(loopcxt_find_by_backing_file(&lc, - backing_file, offset, LOOPDEV_FL_OFFSET))) { + backing_file, offset, sizelimit, LOOPDEV_FL_OFFSET))) { DBG(CXT, ul_debugobj(cxt, "using existing loop device %s", loopcxt_get_device(&lc))); /* Once a loop is initialized RO, there is no way to safely Index: util-linux-2.28/libmount/src/context_umount.c =================================================================== --- util-linux-2.28.orig/libmount/src/context_umount.c +++ util-linux-2.28/libmount/src/context_umount.c @@ -328,7 +328,7 @@ static int is_associated_fs(const char * return 0; } - return loopdev_is_used(devname, src, offset, flags); + return loopdev_is_used(devname, src, offset, 0, flags); } static int prepare_helper_from_options(struct libmnt_context *cxt, Index: util-linux-2.28/libmount/src/tab.c =================================================================== --- util-linux-2.28.orig/libmount/src/tab.c +++ util-linux-2.28/libmount/src/tab.c @@ -1563,7 +1563,7 @@ int mnt_table_is_fs_mounted(struct libmn DBG(FS, ul_debugobj(fs, "checking for loop: src=%s", mnt_fs_get_srcpath(fs))); #if __linux__ - if (!loopdev_is_used(mnt_fs_get_srcpath(fs), src, offset, flags)) + if (!loopdev_is_used(mnt_fs_get_srcpath(fs), src, offset, 0, flags)) continue; DBG(FS, ul_debugobj(fs, "used loop")); Index: util-linux-2.28/sys-utils/losetup.c =================================================================== --- util-linux-2.28.orig/sys-utils/losetup.c +++ util-linux-2.28/sys-utils/losetup.c @@ -178,10 +178,10 @@ static int show_all_loops(struct loopdev int used; const char *bf = cn_file ? cn_file : file; - used = loopcxt_is_used(lc, st, bf, offset, flags); + used = loopcxt_is_used(lc, st, bf, offset, 0, flags); if (!used && !cn_file) { bf = cn_file = canonicalize_path(file); - used = loopcxt_is_used(lc, st, bf, offset, flags); + used = loopcxt_is_used(lc, st, bf, offset, 0, flags); } if (!used) continue; @@ -344,10 +344,10 @@ static int show_table(struct loopdev_cxt int used; const char *bf = cn_file ? cn_file : file; - used = loopcxt_is_used(lc, st, bf, offset, flags); + used = loopcxt_is_used(lc, st, bf, offset, 0, flags); if (!used && !cn_file) { bf = cn_file = canonicalize_path(file); - used = loopcxt_is_used(lc, st, bf, offset, flags); + used = loopcxt_is_used(lc, st, bf, offset, 0, flags); } if (!used) continue;
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