Move fsync routines of initdb into src/common/
The intention is to used those in other utilities such as pg_basebackup and pg_receivexlog. From: Michael Paquier <michael.paquier@gmail.com>
This commit is contained in:
Peter Eisentraut
parent
6e654546fb
commit
bf5bb2e85b
@ -61,6 +61,7 @@
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#endif
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#include "catalog/catalog.h"
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#include "common/file_utils.h"
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#include "common/restricted_token.h"
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#include "common/username.h"
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#include "mb/pg_wchar.h"
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@ -70,13 +71,6 @@
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#include "fe_utils/string_utils.h"
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/* Define PG_FLUSH_DATA_WORKS if we have an implementation for pg_flush_data */
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#if defined(HAVE_SYNC_FILE_RANGE)
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#define PG_FLUSH_DATA_WORKS 1
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#elif defined(USE_POSIX_FADVISE) && defined(POSIX_FADV_DONTNEED)
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#define PG_FLUSH_DATA_WORKS 1
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#endif
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/* Ideally this would be in a .h file, but it hardly seems worth the trouble */
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extern const char *select_default_timezone(const char *share_path);
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@ -237,13 +231,6 @@ static char **filter_lines_with_token(char **lines, const char *token);
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#endif
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static char **readfile(const char *path);
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static void writefile(char *path, char **lines);
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static void walkdir(const char *path,
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void (*action) (const char *fname, bool isdir),
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bool process_symlinks);
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#ifdef PG_FLUSH_DATA_WORKS
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static void pre_sync_fname(const char *fname, bool isdir);
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#endif
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static void fsync_fname_ext(const char *fname, bool isdir);
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static FILE *popen_check(const char *command, const char *mode);
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static void exit_nicely(void);
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static char *get_id(void);
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@ -270,7 +257,6 @@ static void load_plpgsql(FILE *cmdfd);
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static void vacuum_db(FILE *cmdfd);
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static void make_template0(FILE *cmdfd);
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static void make_postgres(FILE *cmdfd);
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static void fsync_pgdata(void);
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static void trapsig(int signum);
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static void check_ok(void);
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static char *escape_quotes(const char *src);
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@ -528,177 +514,6 @@ writefile(char *path, char **lines)
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}
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}
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/*
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* walkdir: recursively walk a directory, applying the action to each
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* regular file and directory (including the named directory itself).
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*
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* If process_symlinks is true, the action and recursion are also applied
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* to regular files and directories that are pointed to by symlinks in the
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* given directory; otherwise symlinks are ignored. Symlinks are always
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* ignored in subdirectories, ie we intentionally don't pass down the
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* process_symlinks flag to recursive calls.
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*
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* Errors are reported but not considered fatal.
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*
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* See also walkdir in fd.c, which is a backend version of this logic.
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*/
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static void
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walkdir(const char *path,
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void (*action) (const char *fname, bool isdir),
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bool process_symlinks)
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{
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DIR *dir;
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struct dirent *de;
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dir = opendir(path);
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if (dir == NULL)
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{
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fprintf(stderr, _("%s: could not open directory \"%s\": %s\n"),
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progname, path, strerror(errno));
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return;
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}
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while (errno = 0, (de = readdir(dir)) != NULL)
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{
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char subpath[MAXPGPATH];
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struct stat fst;
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int sret;
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if (strcmp(de->d_name, ".") == 0 ||
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strcmp(de->d_name, "..") == 0)
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continue;
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snprintf(subpath, MAXPGPATH, "%s/%s", path, de->d_name);
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if (process_symlinks)
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sret = stat(subpath, &fst);
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else
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sret = lstat(subpath, &fst);
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if (sret < 0)
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{
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fprintf(stderr, _("%s: could not stat file \"%s\": %s\n"),
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progname, subpath, strerror(errno));
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continue;
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}
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if (S_ISREG(fst.st_mode))
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(*action) (subpath, false);
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else if (S_ISDIR(fst.st_mode))
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walkdir(subpath, action, false);
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}
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if (errno)
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fprintf(stderr, _("%s: could not read directory \"%s\": %s\n"),
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progname, path, strerror(errno));
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(void) closedir(dir);
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/*
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* It's important to fsync the destination directory itself as individual
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* file fsyncs don't guarantee that the directory entry for the file is
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* synced. Recent versions of ext4 have made the window much wider but
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* it's been an issue for ext3 and other filesystems in the past.
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*/
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(*action) (path, true);
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}
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/*
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* Hint to the OS that it should get ready to fsync() this file.
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*
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* Ignores errors trying to open unreadable files, and reports other errors
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* non-fatally.
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*/
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#ifdef PG_FLUSH_DATA_WORKS
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static void
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pre_sync_fname(const char *fname, bool isdir)
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{
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int fd;
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fd = open(fname, O_RDONLY | PG_BINARY);
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if (fd < 0)
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{
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if (errno == EACCES || (isdir && errno == EISDIR))
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return;
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fprintf(stderr, _("%s: could not open file \"%s\": %s\n"),
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progname, fname, strerror(errno));
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return;
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}
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/*
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* We do what pg_flush_data() would do in the backend: prefer to use
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* sync_file_range, but fall back to posix_fadvise. We ignore errors
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* because this is only a hint.
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*/
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#if defined(HAVE_SYNC_FILE_RANGE)
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(void) sync_file_range(fd, 0, 0, SYNC_FILE_RANGE_WRITE);
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#elif defined(USE_POSIX_FADVISE) && defined(POSIX_FADV_DONTNEED)
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(void) posix_fadvise(fd, 0, 0, POSIX_FADV_DONTNEED);
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#else
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#error PG_FLUSH_DATA_WORKS should not have been defined
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#endif
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(void) close(fd);
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}
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#endif /* PG_FLUSH_DATA_WORKS */
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/*
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* fsync_fname_ext -- Try to fsync a file or directory
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*
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* Ignores errors trying to open unreadable files, or trying to fsync
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* directories on systems where that isn't allowed/required. Reports
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* other errors non-fatally.
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*/
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static void
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fsync_fname_ext(const char *fname, bool isdir)
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{
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int fd;
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int flags;
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int returncode;
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/*
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* Some OSs require directories to be opened read-only whereas other
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* systems don't allow us to fsync files opened read-only; so we need both
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* cases here. Using O_RDWR will cause us to fail to fsync files that are
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* not writable by our userid, but we assume that's OK.
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*/
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flags = PG_BINARY;
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if (!isdir)
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flags |= O_RDWR;
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else
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flags |= O_RDONLY;
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/*
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* Open the file, silently ignoring errors about unreadable files (or
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* unsupported operations, e.g. opening a directory under Windows), and
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* logging others.
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*/
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fd = open(fname, flags);
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if (fd < 0)
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{
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if (errno == EACCES || (isdir && errno == EISDIR))
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return;
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fprintf(stderr, _("%s: could not open file \"%s\": %s\n"),
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progname, fname, strerror(errno));
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return;
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}
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returncode = fsync(fd);
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/*
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* Some OSes don't allow us to fsync directories at all, so we can ignore
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* those errors. Anything else needs to be reported.
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*/
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if (returncode != 0 && !(isdir && errno == EBADF))
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fprintf(stderr, _("%s: could not fsync file \"%s\": %s\n"),
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progname, fname, strerror(errno));
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(void) close(fd);
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}
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/*
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* Open a subcommand with suitable error messaging
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*/
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@ -2276,77 +2091,6 @@ make_postgres(FILE *cmdfd)
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PG_CMD_PUTS(*line);
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}
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/*
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* Issue fsync recursively on PGDATA and all its contents.
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*
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* We fsync regular files and directories wherever they are, but we
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* follow symlinks only for pg_xlog and immediately under pg_tblspc.
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* Other symlinks are presumed to point at files we're not responsible
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* for fsyncing, and might not have privileges to write at all.
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*
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* Errors are reported but not considered fatal.
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*/
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static void
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fsync_pgdata(void)
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{
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bool xlog_is_symlink;
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char pg_xlog[MAXPGPATH];
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char pg_tblspc[MAXPGPATH];
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fputs(_("syncing data to disk ... "), stdout);
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fflush(stdout);
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snprintf(pg_xlog, MAXPGPATH, "%s/pg_xlog", pg_data);
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snprintf(pg_tblspc, MAXPGPATH, "%s/pg_tblspc", pg_data);
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/*
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* If pg_xlog is a symlink, we'll need to recurse into it separately,
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* because the first walkdir below will ignore it.
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*/
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xlog_is_symlink = false;
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#ifndef WIN32
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{
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struct stat st;
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if (lstat(pg_xlog, &st) < 0)
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fprintf(stderr, _("%s: could not stat file \"%s\": %s\n"),
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progname, pg_xlog, strerror(errno));
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else if (S_ISLNK(st.st_mode))
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xlog_is_symlink = true;
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}
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#else
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if (pgwin32_is_junction(pg_xlog))
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xlog_is_symlink = true;
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#endif
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/*
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* If possible, hint to the kernel that we're soon going to fsync the data
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* directory and its contents.
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*/
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#ifdef PG_FLUSH_DATA_WORKS
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walkdir(pg_data, pre_sync_fname, false);
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if (xlog_is_symlink)
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walkdir(pg_xlog, pre_sync_fname, false);
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walkdir(pg_tblspc, pre_sync_fname, true);
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#endif
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/*
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* Now we do the fsync()s in the same order.
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*
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* The main call ignores symlinks, so in addition to specially processing
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* pg_xlog if it's a symlink, pg_tblspc has to be visited separately with
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* process_symlinks = true. Note that if there are any plain directories
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* in pg_tblspc, they'll get fsync'd twice. That's not an expected case
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* so we don't worry about optimizing it.
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*/
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walkdir(pg_data, fsync_fname_ext, false);
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if (xlog_is_symlink)
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walkdir(pg_xlog, fsync_fname_ext, false);
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walkdir(pg_tblspc, fsync_fname_ext, true);
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check_ok();
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}
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/*
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@ -3512,7 +3256,10 @@ main(int argc, char *argv[])
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exit_nicely();
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}
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fsync_pgdata();
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fputs(_("syncing data to disk ... "), stdout);
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fflush(stdout);
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fsync_pgdata(pg_data, progname);
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check_ok();
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return 0;
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}
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@ -3574,7 +3321,12 @@ main(int argc, char *argv[])
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initialize_data_directory();
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if (do_sync)
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fsync_pgdata();
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{
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fputs(_("syncing data to disk ... "), stdout);
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fflush(stdout);
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fsync_pgdata(pg_data, progname);
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check_ok();
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}
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else
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printf(_("\nSync to disk skipped.\nThe data directory might become corrupt if the operating system crashes.\n"));
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@ -1,5 +1,5 @@
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# src/bin/initdb/nls.mk
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CATALOG_NAME = initdb
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AVAIL_LANGUAGES = cs de es fr it ja ko pl pt_BR ru sv zh_CN
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GETTEXT_FILES = findtimezone.c initdb.c ../../common/exec.c ../../common/fe_memutils.c ../../common/pgfnames.c ../../common/restricted_token.c ../../common/rmtree.c ../../common/username.c ../../common/wait_error.c ../../port/dirmod.c
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GETTEXT_FILES = findtimezone.c initdb.c ../../common/exec.c ../../common/fe_memutils.c ../../common/file_utils.c ../../common/pgfnames.c ../../common/restricted_token.c ../../common/rmtree.c ../../common/username.c ../../common/wait_error.c ../../port/dirmod.c
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GETTEXT_TRIGGERS = simple_prompt
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@ -1,5 +1,5 @@
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# src/bin/pg_basebackup/nls.mk
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CATALOG_NAME = pg_basebackup
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AVAIL_LANGUAGES = de es fr it ko pl pt_BR ru zh_CN
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GETTEXT_FILES = pg_basebackup.c pg_receivexlog.c pg_recvlogical.c receivelog.c streamutil.c ../../common/fe_memutils.c
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GETTEXT_FILES = pg_basebackup.c pg_receivexlog.c pg_recvlogical.c receivelog.c streamutil.c ../../common/fe_memutils.c ../../common/file_utils.c
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GETTEXT_TRIGGERS = simple_prompt
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@ -44,7 +44,7 @@ OBJS_COMMON = config_info.o controldata_utils.o exec.o ip.o keywords.o \
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md5.o pg_lzcompress.o pgfnames.o psprintf.o relpath.o rmtree.o \
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string.o username.o wait_error.o
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OBJS_FRONTEND = $(OBJS_COMMON) fe_memutils.o restricted_token.o
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OBJS_FRONTEND = $(OBJS_COMMON) fe_memutils.o file_utils.o restricted_token.o
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OBJS_SRV = $(OBJS_COMMON:%.o=%_srv.o)
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276
src/common/file_utils.c
Normal file
276
src/common/file_utils.c
Normal file
@ -0,0 +1,276 @@
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/*-------------------------------------------------------------------------
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*
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* File-processing utility routines.
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*
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* Assorted utility functions to work on files.
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*
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*
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* Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/common/file_utils.c
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres_fe.h"
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#include <dirent.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "common/file_utils.h"
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/* Define PG_FLUSH_DATA_WORKS if we have an implementation for pg_flush_data */
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#if defined(HAVE_SYNC_FILE_RANGE)
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#define PG_FLUSH_DATA_WORKS 1
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#elif defined(USE_POSIX_FADVISE) && defined(POSIX_FADV_DONTNEED)
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#define PG_FLUSH_DATA_WORKS 1
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#endif
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#ifdef PG_FLUSH_DATA_WORKS
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static void pre_sync_fname(const char *fname, bool isdir,
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const char *progname);
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#endif
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static void walkdir(const char *path,
|
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void (*action) (const char *fname, bool isdir, const char *progname),
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bool process_symlinks, const char *progname);
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/*
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* Issue fsync recursively on PGDATA and all its contents.
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*
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* We fsync regular files and directories wherever they are, but we
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* follow symlinks only for pg_xlog and immediately under pg_tblspc.
|
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* Other symlinks are presumed to point at files we're not responsible
|
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* for fsyncing, and might not have privileges to write at all.
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*
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* Errors are reported but not considered fatal.
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*/
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void
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fsync_pgdata(const char *pg_data, const char *progname)
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{
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bool xlog_is_symlink;
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char pg_xlog[MAXPGPATH];
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char pg_tblspc[MAXPGPATH];
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snprintf(pg_xlog, MAXPGPATH, "%s/pg_xlog", pg_data);
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snprintf(pg_tblspc, MAXPGPATH, "%s/pg_tblspc", pg_data);
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/*
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* If pg_xlog is a symlink, we'll need to recurse into it separately,
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* because the first walkdir below will ignore it.
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*/
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xlog_is_symlink = false;
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#ifndef WIN32
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{
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struct stat st;
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if (lstat(pg_xlog, &st) < 0)
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fprintf(stderr, _("%s: could not stat file \"%s\": %s\n"),
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progname, pg_xlog, strerror(errno));
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else if (S_ISLNK(st.st_mode))
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xlog_is_symlink = true;
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}
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#else
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if (pgwin32_is_junction(pg_xlog))
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xlog_is_symlink = true;
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#endif
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/*
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* If possible, hint to the kernel that we're soon going to fsync the data
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* directory and its contents.
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*/
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#ifdef PG_FLUSH_DATA_WORKS
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walkdir(pg_data, pre_sync_fname, false, progname);
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if (xlog_is_symlink)
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walkdir(pg_xlog, pre_sync_fname, false, progname);
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walkdir(pg_tblspc, pre_sync_fname, true, progname);
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#endif
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/*
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* Now we do the fsync()s in the same order.
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*
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* The main call ignores symlinks, so in addition to specially processing
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* pg_xlog if it's a symlink, pg_tblspc has to be visited separately with
|
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* process_symlinks = true. Note that if there are any plain directories
|
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* in pg_tblspc, they'll get fsync'd twice. That's not an expected case
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* so we don't worry about optimizing it.
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*/
|
||||
walkdir(pg_data, fsync_fname, false, progname);
|
||||
if (xlog_is_symlink)
|
||||
walkdir(pg_xlog, fsync_fname, false, progname);
|
||||
walkdir(pg_tblspc, fsync_fname, true, progname);
|
||||
}
|
||||
|
||||
/*
|
||||
* walkdir: recursively walk a directory, applying the action to each
|
||||
* regular file and directory (including the named directory itself).
|
||||
*
|
||||
* If process_symlinks is true, the action and recursion are also applied
|
||||
* to regular files and directories that are pointed to by symlinks in the
|
||||
* given directory; otherwise symlinks are ignored. Symlinks are always
|
||||
* ignored in subdirectories, ie we intentionally don't pass down the
|
||||
* process_symlinks flag to recursive calls.
|
||||
*
|
||||
* Errors are reported but not considered fatal.
|
||||
*
|
||||
* See also walkdir in fd.c, which is a backend version of this logic.
|
||||
*/
|
||||
static void
|
||||
walkdir(const char *path,
|
||||
void (*action) (const char *fname, bool isdir, const char *progname),
|
||||
bool process_symlinks, const char *progname)
|
||||
{
|
||||
DIR *dir;
|
||||
struct dirent *de;
|
||||
|
||||
dir = opendir(path);
|
||||
if (dir == NULL)
|
||||
{
|
||||
fprintf(stderr, _("%s: could not open directory \"%s\": %s\n"),
|
||||
progname, path, strerror(errno));
|
||||
return;
|
||||
}
|
||||
|
||||
while (errno = 0, (de = readdir(dir)) != NULL)
|
||||
{
|
||||
char subpath[MAXPGPATH];
|
||||
struct stat fst;
|
||||
int sret;
|
||||
|
||||
if (strcmp(de->d_name, ".") == 0 ||
|
||||
strcmp(de->d_name, "..") == 0)
|
||||
continue;
|
||||
|
||||
snprintf(subpath, MAXPGPATH, "%s/%s", path, de->d_name);
|
||||
|
||||
if (process_symlinks)
|
||||
sret = stat(subpath, &fst);
|
||||
else
|
||||
sret = lstat(subpath, &fst);
|
||||
|
||||
if (sret < 0)
|
||||
{
|
||||
fprintf(stderr, _("%s: could not stat file \"%s\": %s\n"),
|
||||
progname, subpath, strerror(errno));
|
||||
continue;
|
||||
}
|
||||
|
||||
if (S_ISREG(fst.st_mode))
|
||||
(*action) (subpath, false, progname);
|
||||
else if (S_ISDIR(fst.st_mode))
|
||||
walkdir(subpath, action, false, progname);
|
||||
}
|
||||
|
||||
if (errno)
|
||||
fprintf(stderr, _("%s: could not read directory \"%s\": %s\n"),
|
||||
progname, path, strerror(errno));
|
||||
|
||||
(void) closedir(dir);
|
||||
|
||||
/*
|
||||
* It's important to fsync the destination directory itself as individual
|
||||
* file fsyncs don't guarantee that the directory entry for the file is
|
||||
* synced. Recent versions of ext4 have made the window much wider but
|
||||
* it's been an issue for ext3 and other filesystems in the past.
|
||||
*/
|
||||
(*action) (path, true, progname);
|
||||
}
|
||||
|
||||
/*
|
||||
* Hint to the OS that it should get ready to fsync() this file.
|
||||
*
|
||||
* Ignores errors trying to open unreadable files, and reports other errors
|
||||
* non-fatally.
|
||||
*/
|
||||
#ifdef PG_FLUSH_DATA_WORKS
|
||||
|
||||
static void
|
||||
pre_sync_fname(const char *fname, bool isdir, const char *progname)
|
||||
{
|
||||
int fd;
|
||||
|
||||
fd = open(fname, O_RDONLY | PG_BINARY);
|
||||
|
||||
if (fd < 0)
|
||||
{
|
||||
if (errno == EACCES || (isdir && errno == EISDIR))
|
||||
return;
|
||||
fprintf(stderr, _("%s: could not open file \"%s\": %s\n"),
|
||||
progname, fname, strerror(errno));
|
||||
return;
|
||||
}
|
||||
|
||||
/*
|
||||
* We do what pg_flush_data() would do in the backend: prefer to use
|
||||
* sync_file_range, but fall back to posix_fadvise. We ignore errors
|
||||
* because this is only a hint.
|
||||
*/
|
||||
#if defined(HAVE_SYNC_FILE_RANGE)
|
||||
(void) sync_file_range(fd, 0, 0, SYNC_FILE_RANGE_WRITE);
|
||||
#elif defined(USE_POSIX_FADVISE) && defined(POSIX_FADV_DONTNEED)
|
||||
(void) posix_fadvise(fd, 0, 0, POSIX_FADV_DONTNEED);
|
||||
#else
|
||||
#error PG_FLUSH_DATA_WORKS should not have been defined
|
||||
#endif
|
||||
|
||||
(void) close(fd);
|
||||
}
|
||||
|
||||
#endif /* PG_FLUSH_DATA_WORKS */
|
||||
|
||||
/*
|
||||
* fsync_fname -- Try to fsync a file or directory
|
||||
*
|
||||
* Ignores errors trying to open unreadable files, or trying to fsync
|
||||
* directories on systems where that isn't allowed/required. Reports
|
||||
* other errors non-fatally.
|
||||
*/
|
||||
void
|
||||
fsync_fname(const char *fname, bool isdir, const char *progname)
|
||||
{
|
||||
int fd;
|
||||
int flags;
|
||||
int returncode;
|
||||
|
||||
/*
|
||||
* Some OSs require directories to be opened read-only whereas other
|
||||
* systems don't allow us to fsync files opened read-only; so we need both
|
||||
* cases here. Using O_RDWR will cause us to fail to fsync files that are
|
||||
* not writable by our userid, but we assume that's OK.
|
||||
*/
|
||||
flags = PG_BINARY;
|
||||
if (!isdir)
|
||||
flags |= O_RDWR;
|
||||
else
|
||||
flags |= O_RDONLY;
|
||||
|
||||
/*
|
||||
* Open the file, silently ignoring errors about unreadable files (or
|
||||
* unsupported operations, e.g. opening a directory under Windows), and
|
||||
* logging others.
|
||||
*/
|
||||
fd = open(fname, flags);
|
||||
if (fd < 0)
|
||||
{
|
||||
if (errno == EACCES || (isdir && errno == EISDIR))
|
||||
return;
|
||||
fprintf(stderr, _("%s: could not open file \"%s\": %s\n"),
|
||||
progname, fname, strerror(errno));
|
||||
return;
|
||||
}
|
||||
|
||||
returncode = fsync(fd);
|
||||
|
||||
/*
|
||||
* Some OSes don't allow us to fsync directories at all, so we can ignore
|
||||
* those errors. Anything else needs to be reported.
|
||||
*/
|
||||
if (returncode != 0 && !(isdir && errno == EBADF))
|
||||
fprintf(stderr, _("%s: could not fsync file \"%s\": %s\n"),
|
||||
progname, fname, strerror(errno));
|
||||
|
||||
(void) close(fd);
|
||||
}
|
||||
22
src/include/common/file_utils.h
Normal file
22
src/include/common/file_utils.h
Normal file
@ -0,0 +1,22 @@
|
||||
/*-------------------------------------------------------------------------
|
||||
*
|
||||
* File-processing utility routines for frontend code
|
||||
*
|
||||
* Assorted utility functions to work on files.
|
||||
*
|
||||
*
|
||||
* Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* src/include/common/file_utils.h
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
#ifndef FILE_UTILS_H
|
||||
#define FILE_UTILS_H
|
||||
|
||||
extern void fsync_fname(const char *fname, bool isdir,
|
||||
const char *progname);
|
||||
extern void fsync_pgdata(const char *pg_data, const char *progname);
|
||||
|
||||
#endif /* FILE_UTILS_H */
|
||||
@ -115,7 +115,7 @@ sub mkvcbuild
|
||||
string.c username.c wait_error.c);
|
||||
|
||||
our @pgcommonfrontendfiles = (
|
||||
@pgcommonallfiles, qw(fe_memutils.c
|
||||
@pgcommonallfiles, qw(fe_memutils.c file_utils.c
|
||||
restricted_token.c));
|
||||
|
||||
our @pgcommonbkndfiles = @pgcommonallfiles;
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user