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-rw-r--r--applypatch/applypatch.cpp14
-rw-r--r--applypatch/freecache.cpp168
-rw-r--r--applypatch/include/applypatch/applypatch.h6
3 files changed, 129 insertions, 59 deletions
diff --git a/applypatch/applypatch.cpp b/applypatch/applypatch.cpp
index 7645a4005..6f6c187be 100644
--- a/applypatch/applypatch.cpp
+++ b/applypatch/applypatch.cpp
@@ -436,13 +436,13 @@ static size_t FileSink(const unsigned char* data, size_t len, int fd) {
// Return the amount of free space (in bytes) on the filesystem
// containing filename. filename must exist. Return -1 on error.
-size_t FreeSpaceForFile(const char* filename) {
- struct statfs sf;
- if (statfs(filename, &sf) != 0) {
- printf("failed to statfs %s: %s\n", filename, strerror(errno));
- return -1;
- }
- return sf.f_bsize * sf.f_bavail;
+size_t FreeSpaceForFile(const std::string& filename) {
+ struct statfs sf;
+ if (statfs(filename.c_str(), &sf) != 0) {
+ printf("failed to statfs %s: %s\n", filename.c_str(), strerror(errno));
+ return -1;
+ }
+ return sf.f_bsize * sf.f_bavail;
}
int CacheSizeCheck(size_t bytes) {
diff --git a/applypatch/freecache.cpp b/applypatch/freecache.cpp
index ea364d8e6..cfab0f6db 100644
--- a/applypatch/freecache.cpp
+++ b/applypatch/freecache.cpp
@@ -14,7 +14,10 @@
* limitations under the License.
*/
+#include <ctype.h>
+#include <dirent.h>
#include <errno.h>
+#include <error.h>
#include <libgen.h>
#include <stdio.h>
#include <stdlib.h>
@@ -22,20 +25,22 @@
#include <sys/stat.h>
#include <sys/statfs.h>
#include <unistd.h>
-#include <dirent.h>
-#include <ctype.h>
+#include <algorithm>
+#include <limits>
#include <memory>
#include <set>
#include <string>
+#include <android-base/file.h>
#include <android-base/parseint.h>
#include <android-base/stringprintf.h>
+#include <android-base/strings.h>
#include "applypatch/applypatch.h"
#include "otautil/cache_location.h"
-static int EliminateOpenFiles(std::set<std::string>* files) {
+static int EliminateOpenFiles(const std::string& dirname, std::set<std::string>* files) {
std::unique_ptr<DIR, decltype(&closedir)> d(opendir("/proc"), closedir);
if (!d) {
printf("error opening /proc: %s\n", strerror(errno));
@@ -62,7 +67,7 @@ static int EliminateOpenFiles(std::set<std::string>* files) {
int count = readlink(fd_path.c_str(), link, sizeof(link)-1);
if (count >= 0) {
link[count] = '\0';
- if (strncmp(link, "/cache/", 7) == 0) {
+ if (android::base::StartsWith(link, dirname)) {
if (files->erase(link) > 0) {
printf("%s is open by %s\n", link, de->d_name);
}
@@ -73,77 +78,138 @@ static int EliminateOpenFiles(std::set<std::string>* files) {
return 0;
}
-static std::set<std::string> FindExpendableFiles() {
+static std::vector<std::string> FindExpendableFiles(
+ const std::string& dirname, const std::function<bool(const std::string&)>& name_filter) {
std::set<std::string> files;
- // We're allowed to delete unopened regular files in any of these
- // directories.
- const char* dirs[2] = {"/cache", "/cache/recovery/otatest"};
-
- for (size_t i = 0; i < sizeof(dirs)/sizeof(dirs[0]); ++i) {
- std::unique_ptr<DIR, decltype(&closedir)> d(opendir(dirs[i]), closedir);
- if (!d) {
- printf("error opening %s: %s\n", dirs[i], strerror(errno));
+
+ std::unique_ptr<DIR, decltype(&closedir)> d(opendir(dirname.c_str()), closedir);
+ if (!d) {
+ printf("error opening %s: %s\n", dirname.c_str(), strerror(errno));
+ return {};
+ }
+
+ // Look for regular files in the directory (not in any subdirectories).
+ struct dirent* de;
+ while ((de = readdir(d.get())) != 0) {
+ std::string path = dirname + "/" + de->d_name;
+
+ // We can't delete cache_temp_source; if it's there we might have restarted during
+ // installation and could be depending on it to be there.
+ if (path == CacheLocation::location().cache_temp_source()) {
continue;
}
- // Look for regular files in the directory (not in any subdirectories).
- struct dirent* de;
- while ((de = readdir(d.get())) != 0) {
- std::string path = std::string(dirs[i]) + "/" + de->d_name;
-
- // We can't delete cache_temp_source; if it's there we might have restarted during
- // installation and could be depending on it to be there.
- if (path == CacheLocation::location().cache_temp_source()) {
- continue;
- }
+ // Do not delete the file if it doesn't have the expected format.
+ if (name_filter != nullptr && !name_filter(de->d_name)) {
+ continue;
+ }
- struct stat st;
- if (stat(path.c_str(), &st) == 0 && S_ISREG(st.st_mode)) {
- files.insert(path);
- }
+ struct stat st;
+ if (stat(path.c_str(), &st) == 0 && S_ISREG(st.st_mode)) {
+ files.insert(path);
}
}
- printf("%zu regular files in deletable directories\n", files.size());
- if (EliminateOpenFiles(&files) < 0) {
- return std::set<std::string>();
+ printf("%zu regular files in deletable directory\n", files.size());
+ if (EliminateOpenFiles(dirname, &files) < 0) {
+ return {};
+ }
+
+ return std::vector<std::string>(files.begin(), files.end());
+}
+
+// Parses the index of given log file, e.g. 3 for last_log.3; returns max number if the log name
+// doesn't have the expected format so that we'll delete these ones first.
+static unsigned int GetLogIndex(const std::string& log_name) {
+ if (log_name == "last_log" || log_name == "last_kmsg") {
+ return 0;
+ }
+
+ unsigned int index;
+ if (sscanf(log_name.c_str(), "last_log.%u", &index) == 1 ||
+ sscanf(log_name.c_str(), "last_kmsg.%u", &index) == 1) {
+ return index;
}
- return files;
+
+ return std::numeric_limits<unsigned int>::max();
}
int MakeFreeSpaceOnCache(size_t bytes_needed) {
#ifndef __ANDROID__
// TODO (xunchang) implement a heuristic cache size check during host simulation.
- printf("Skip making (%zu) bytes free space on cache; program is running on host\n", bytes_needed);
+ printf("Skip making (%zu) bytes free space on /cache; program is running on host\n",
+ bytes_needed);
return 0;
#endif
- size_t free_now = FreeSpaceForFile("/cache");
- printf("%zu bytes free on /cache (%zu needed)\n", free_now, bytes_needed);
+ std::vector<std::string> dirs = { "/cache", CacheLocation::location().cache_log_directory() };
+ for (const auto& dirname : dirs) {
+ if (RemoveFilesInDirectory(bytes_needed, dirname, FreeSpaceForFile)) {
+ return 0;
+ }
+ }
- if (free_now >= bytes_needed) {
- return 0;
+ return -1;
+}
+
+bool RemoveFilesInDirectory(size_t bytes_needed, const std::string& dirname,
+ const std::function<size_t(const std::string&)>& space_checker) {
+ struct stat st;
+ if (stat(dirname.c_str(), &st) != 0) {
+ error(0, errno, "Unable to free space on %s", dirname.c_str());
+ return false;
}
- std::set<std::string> files = FindExpendableFiles();
- if (files.empty()) {
- // nothing we can delete to free up space!
- printf("no files can be deleted to free space on /cache\n");
- return -1;
+ if (!S_ISDIR(st.st_mode)) {
+ printf("%s is not a directory\n", dirname.c_str());
+ return false;
+ }
+
+ size_t free_now = space_checker(dirname);
+ printf("%zu bytes free on %s (%zu needed)\n", free_now, dirname.c_str(), bytes_needed);
+
+ if (free_now >= bytes_needed) {
+ return true;
}
- // We could try to be smarter about which files to delete: the
- // biggest ones? the smallest ones that will free up enough space?
- // the oldest? the newest?
- //
- // Instead, we'll be dumb.
+ std::vector<std::string> files;
+ if (dirname == CacheLocation::location().cache_log_directory()) {
+ // Deletes the log files only.
+ auto log_filter = [](const std::string& file_name) {
+ return android::base::StartsWith(file_name, "last_log") ||
+ android::base::StartsWith(file_name, "last_kmsg");
+ };
+
+ files = FindExpendableFiles(dirname, log_filter);
+
+ // Older logs will come to the top of the queue.
+ auto comparator = [](const std::string& name1, const std::string& name2) -> bool {
+ unsigned int index1 = GetLogIndex(android::base::Basename(name1));
+ unsigned int index2 = GetLogIndex(android::base::Basename(name2));
+ if (index1 == index2) {
+ return name1 < name2;
+ }
+
+ return index1 > index2;
+ };
+
+ std::sort(files.begin(), files.end(), comparator);
+ } else {
+ // We're allowed to delete unopened regular files in the directory.
+ files = FindExpendableFiles(dirname, nullptr);
+ }
for (const auto& file : files) {
- unlink(file.c_str());
- free_now = FreeSpaceForFile("/cache");
+ if (unlink(file.c_str()) == -1) {
+ error(0, errno, "Failed to delete %s", file.c_str());
+ continue;
+ }
+
+ free_now = space_checker(dirname);
printf("deleted %s; now %zu bytes free\n", file.c_str(), free_now);
- if (free_now < bytes_needed) {
- break;
+ if (free_now >= bytes_needed) {
+ return true;
}
}
- return (free_now >= bytes_needed) ? 0 : -1;
+
+ return false;
}
diff --git a/applypatch/include/applypatch/applypatch.h b/applypatch/include/applypatch/applypatch.h
index 912ead1fa..021a28d05 100644
--- a/applypatch/include/applypatch/applypatch.h
+++ b/applypatch/include/applypatch/applypatch.h
@@ -39,7 +39,7 @@ using SinkFn = std::function<size_t(const unsigned char*, size_t)>;
// applypatch.cpp
int ShowLicenses();
-size_t FreeSpaceForFile(const char* filename);
+size_t FreeSpaceForFile(const std::string& filename);
int CacheSizeCheck(size_t bytes);
int ParseSha1(const char* str, uint8_t* digest);
@@ -79,5 +79,9 @@ int ApplyImagePatch(const unsigned char* old_data, size_t old_size, const Value&
// freecache.cpp
int MakeFreeSpaceOnCache(size_t bytes_needed);
+// Removes the files in |dirname| until we have at least |bytes_needed| bytes of free space on
+// the partition. The size of the free space is returned by calling |space_checker|.
+bool RemoveFilesInDirectory(size_t bytes_needed, const std::string& dirname,
+ const std::function<size_t(const std::string&)>& space_checker);
#endif
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-19 16:36:57 +0100