| Message ID | 1480671764-10451-1-git-send-email-christophe.milard@linaro.org |
|---|---|
| State | Superseded |
| Headers | show |
On 12/02/16 12:42, Christophe Milard wrote: > _ishm now unlinks the created files as soon as possible, hence reducing > the chance to see left-overs, if ODP terminates abnormaly. > This does not provide 100% guaranty: if we are unlucky enough, > ODP may be killed between open() and unlink(). > Also this method excludes exported files (flag _ODP_ISHM_EXPORT), > whose names shall be seen in the file system. > > Signed-off-by: Christophe Milard <christophe.milard@linaro.org> > --- > platform/linux-generic/_ishm.c | 14 ++++++++++++-- > 1 file changed, 12 insertions(+), 2 deletions(-) > > diff --git a/platform/linux-generic/_ishm.c b/platform/linux-generic/_ishm.c > index 449e357..84d5225 100644 > --- a/platform/linux-generic/_ishm.c > +++ b/platform/linux-generic/_ishm.c > @@ -71,6 +71,7 @@ > #include <sys/types.h> > #include <inttypes.h> > #include <sys/wait.h> > +#include <libgen.h> > > /* > * Maximum number of internal shared memory blocks. > @@ -159,6 +160,7 @@ typedef struct ishm_block { > char exptname[ISHM_FILENAME_MAXLEN]; /* name of the export file */ > uint32_t user_flags; /* any flags the user want to remember. */ > uint32_t flags; /* block creation flags. */ > + uint32_t external_fd; /* block FD was externaly provided */ externaly -> externally and maybe uint32_t external_fd:1; ? Maxim. > uint64_t user_len; /* length, as requested at reserve time. */ > void *start; /* only valid if _ODP_ISHM_SINGLE_VA is set*/ > uint64_t len; /* length. multiple of page size. 0 if free*/ > @@ -452,15 +454,17 @@ static int create_file(int block_index, huge_flag_t huge, uint64_t len, > ODP_ERR("ftruncate failed: fd=%d, err=%s.\n", > fd, strerror(errno)); > close(fd); > + unlink(filename); > return -1; > } > > - strncpy(new_block->filename, filename, ISHM_FILENAME_MAXLEN - 1); > > /* if _ODP_ISHM_EXPORT is set, create a description file for > * external ref: > */ > if (flags & _ODP_ISHM_EXPORT) { > + strncpy(new_block->filename, filename, > + ISHM_FILENAME_MAXLEN - 1); > snprintf(new_block->exptname, ISHM_FILENAME_MAXLEN, > ISHM_EXPTNAME_FORMAT, > odp_global_data.main_pid, > @@ -483,6 +487,8 @@ static int create_file(int block_index, huge_flag_t huge, uint64_t len, > } > } else { > new_block->exptname[0] = 0; > + /* remove the file from the filesystem, keeping its fd open */ > + unlink(filename); > } > > return fd; > @@ -814,6 +820,9 @@ int _odp_ishm_reserve(const char *name, uint64_t size, int fd, > return -1; > } > new_block->huge = EXTERNAL; > + new_block->external_fd = 1; > + } else { > + new_block->external_fd = 0; > } > > /* Otherwise, Try first huge pages when possible and needed: */ > @@ -865,8 +874,9 @@ int _odp_ishm_reserve(const char *name, uint64_t size, int fd, > > /* if neither huge pages or normal pages works, we cannot proceed: */ > if ((fd < 0) || (addr == NULL) || (len == 0)) { > - if ((new_block->filename[0]) && (fd >= 0)) > + if ((!new_block->external_fd) && (fd >= 0)) > close(fd); > + delete_file(new_block); > odp_spinlock_unlock(&ishm_tbl->lock); > ODP_ERR("_ishm_reserve failed.\n"); > return -1; >
diff --git a/platform/linux-generic/_ishm.c b/platform/linux-generic/_ishm.c index 449e357..84d5225 100644 --- a/platform/linux-generic/_ishm.c +++ b/platform/linux-generic/_ishm.c @@ -71,6 +71,7 @@ #include <sys/types.h> #include <inttypes.h> #include <sys/wait.h> +#include <libgen.h> /* * Maximum number of internal shared memory blocks. @@ -159,6 +160,7 @@ typedef struct ishm_block { char exptname[ISHM_FILENAME_MAXLEN]; /* name of the export file */ uint32_t user_flags; /* any flags the user want to remember. */ uint32_t flags; /* block creation flags. */ + uint32_t external_fd; /* block FD was externaly provided */ uint64_t user_len; /* length, as requested at reserve time. */ void *start; /* only valid if _ODP_ISHM_SINGLE_VA is set*/ uint64_t len; /* length. multiple of page size. 0 if free*/ @@ -452,15 +454,17 @@ static int create_file(int block_index, huge_flag_t huge, uint64_t len, ODP_ERR("ftruncate failed: fd=%d, err=%s.\n", fd, strerror(errno)); close(fd); + unlink(filename); return -1; } - strncpy(new_block->filename, filename, ISHM_FILENAME_MAXLEN - 1); /* if _ODP_ISHM_EXPORT is set, create a description file for * external ref: */ if (flags & _ODP_ISHM_EXPORT) { + strncpy(new_block->filename, filename, + ISHM_FILENAME_MAXLEN - 1); snprintf(new_block->exptname, ISHM_FILENAME_MAXLEN, ISHM_EXPTNAME_FORMAT, odp_global_data.main_pid, @@ -483,6 +487,8 @@ static int create_file(int block_index, huge_flag_t huge, uint64_t len, } } else { new_block->exptname[0] = 0; + /* remove the file from the filesystem, keeping its fd open */ + unlink(filename); } return fd; @@ -814,6 +820,9 @@ int _odp_ishm_reserve(const char *name, uint64_t size, int fd, return -1; } new_block->huge = EXTERNAL; + new_block->external_fd = 1; + } else { + new_block->external_fd = 0; } /* Otherwise, Try first huge pages when possible and needed: */ @@ -865,8 +874,9 @@ int _odp_ishm_reserve(const char *name, uint64_t size, int fd, /* if neither huge pages or normal pages works, we cannot proceed: */ if ((fd < 0) || (addr == NULL) || (len == 0)) { - if ((new_block->filename[0]) && (fd >= 0)) + if ((!new_block->external_fd) && (fd >= 0)) close(fd); + delete_file(new_block); odp_spinlock_unlock(&ishm_tbl->lock); ODP_ERR("_ishm_reserve failed.\n"); return -1;
_ishm now unlinks the created files as soon as possible, hence reducing the chance to see left-overs, if ODP terminates abnormaly. This does not provide 100% guaranty: if we are unlucky enough, ODP may be killed between open() and unlink(). Also this method excludes exported files (flag _ODP_ISHM_EXPORT), whose names shall be seen in the file system. Signed-off-by: Christophe Milard <christophe.milard@linaro.org> --- platform/linux-generic/_ishm.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) -- 2.7.4